TECHNICAL FIELD
[0001] The present disclosure relates to a cleaning device for a drafting
roller.
BACKGROUND
[0002] A drafting device provided with a drafting roller that drafts a
fiber band has been known. On an outer circumferential surface of the
drafting roller of such a drafting device, fibers of the fiber band may
adhere. Because of this, in Japanese Unexamined Patent Publication
No. 2015-101797, is a cleaning device that removes fibers that adhered
on the outer circumferential surface of the drafting roller is described,
for example.
SUMMARY
[0003] In the field of the above-described cleaning device for a drafting
roller, it has been desired to reliably remove fibers that adhered on the
outer circumferential surface of the drafting roller.
[0004] Thus, an object of the present disclosure is to provide a cleaning
device for a drafting roller which is capable of removing fibers adhering
on the outer circumferential surface of the drafting roller more reliably.
[0005] One form of the present disclosure is a cleaning device for a
drafting roller including a scraper extending along a width direction of
the drafting roller and configured to come into contact with an outer
circumferential surface of the drafting roller; and the scraper is provided
with, at an end portion on an upstream side in a rotational direction of
the drafting roller, a scraper edge portion configured to come into
contact with the outer circumferential surface of the drafting roller; and
an angle being formed by a tangent-line upstream portion that is on a
tangent line of the drafting roller passing a contact point with the
scraper edge portion and extends from the contact point toward the
upstream side in the rotational direction of the drafting roller, and by an
upstream-side outer surface that is on an outer surface of the scraper
edge portion and is a surface facing the upstream side in the rotational
direction of the drafting roller, when viewed along an axial direction of
the drafting roller, is an obtuse angle.
BRIEF DESCRIPTION OF THE DRAWINGS
[0006] FIG. 1 is a front view of a spinning machine according to an
embodiment;
FIG. 2 is a plan view of a drafting device of a spinning unit in
FIG. 1;
FIG. 3 is a side view of the drafting device of the spinning unit
in FIG. 1;
FIG. 4 is a diagram of a cleaning device provided on a
back-bottom roller in FIG. 2 viewed from the upstream side in a flow
direction of slivers;
FIG. 5 is a cross-sectional view of the cleaning device in FIG. 2;
FIG. 6 is a front view of a scraper in FIG. 5;
FIG. 7 is a cross-sectional view of the scraper along the line
VII-VII in FIG. 6;
FIG. 8 is a perspective view of the scraper in FIG. 6;
FIG. 9 is a front view of a scraper according to a first
modification;
FIG. 10 is a cross-sectional view of the scraper along the line
X-X in FIG. 9;
FIG. 11 is a perspective view of the scraper in FIG. 9;
FIG. 12 is a perspective view of a scraper according to a second
modification;
FIG. 13 is a diagram illustrating a periphery of a stopper portion
in a state that the scraper in FIG. 12 was brought into contact with the
back-bottom roller; and
FIG. 14 is a cross-sectional view of the stopper and the
back-bottom roller, in a state that the scraper in FIG. 12 was brought
into contact with the back-bottom roller.
DETAILED DESCRIPTION
[0007] The following describes an exemplary embodiment of the
present disclosure in detail with reference to the accompanying
drawings. In the respective drawings, for portions that are identical or
equivalent, identical reference signs are given to and redundant
explanations are omitted.
[0008] As illustrated in FIG. 1, a spinning machine 1 includes a
plurality of spinning units 2, a yarn piecing carrier 3, a doffing carrier
(depiction omitted), a first end frame 4, and a second end frame 5. The
spinning units 2 are arrayed in a row. Each spinning unit 2 produces a
yarn Y and takes up to a package P. The yarn piecing carrier 3, when
the yarn Y is cut in a spinning unit 2 or the yarn Y breaks for some
reason, performs a yarn piecing operation on the spinning unit 2. The
doffing carrier, when the package P is fully wound in a spinning unit 2,
doffs the full package P and supplies a new bobbin B to the relevant
spinning unit 2.
[0009] In the first end frame 4, accommodated are a recovery
apparatus, which recovers fiber waste and yarn waste that arise in the
spinning units 2, and others. In the second end frame 5,
accommodated are an air supplier that adjusts an air pressure of
compressed air (air) supplied to the spinning machine 1 and supplies the
air to various units of the spinning machine 1, and drive motors and
others for supplying power to various units of the spinning units 2. On
the second end frame 5, a machine control device 51, a display screen
52, and input keys 53 are provided.
[0010] The machine control device 51 centrally manages and controls
the various units of the spinning machine 1. The display screen 52 can
display information containing at least either of information concerning
the setting content of the spinning units 2 and information concerning
the state thereof. By an appropriate operation by an operator using the
input keys 53, a setting work of the spinning units 2 can be performed.
[0011] Each spinning unit 2 includes, in order from the upstream side in
a traveling direction of the yarn Y, a drafting device 6, an air spinning
device 7, a yarn monitor 8, a tension sensor 9, a yarn storage device 11,
a waxing device 12, and a winding device 13. A unit controller 10 is
provided for each certain number of spinning units 2 and controls the
operation of the spinning units 2.
[0012] The drafting device 6 drafts a sliver (fiber band) S. The air
spinning device 7 gives twist to a fiber band F, which has been drafted
by the drafting device 6, by a swirl airflow and produces the yarn Y
The yarn storage device 11 takes up the slack of the yarn Y between the
air spinning device 7 and the winding device 13. The waxing device
12 applies wax to the yam Y between the yam storage device 11 and the
winding device 13. The winding device 13 takes up the yam Y onto a
bobbin B and forms the package P.
[0013] The yam monitor 8 monitors information on the traveling yam Y
between the air spinning device 7 and the yam storage device 11 and,
based on the monitored information, detects the presence of a yam
defect. The yam monitor 8, when a yam defect is detected, transmits a
yam-defect detection signal to the unit controller 10. The tension
sensor 9 measures the tension of the traveling yam Y between the air
spinning device 7 and the yam storage device 11, and transmits a
tension measurement signal to the unit controller 10. When the unit
controller 10 determines, based on the detection result of at least either
of the yam monitor 8 and the tension sensor 9, that there is abnormality,
the yam Y is cut in the spinning unit 2.
[0014] The above-described drafting device 6 will be described in
detail. As illustrated in FIGS. 2 and 3, the drafting device 6 includes,
in order from the upstream side in a traveling direction of the sliver S, a
back-roller pair 14, a third roller pair 15, a middle roller pair 16, and a
front roller pair 17.
[0015] The back-roller pair 14 includes, as a drafting roller that drafts
the sliver S, a back-bottom roller (bottom roller) 14a and a back top
roller 14b that face each other across a traveling path R through which
the sliver S is made to travel. The third roller pair 15 includes, as a
drafting roller that drafts the sliver S, a third bottom roller (bottom
roller) 15a and a third top roller 15b that face each other across the
traveling path R.
[0016] The middle roller pair 16 includes a middle bottom roller 16a
and a middle top roller 16b that face each other across the traveling path
R. On the middle bottom roller 16a, an apron belt 18a is wound. On
the middle top roller 16b, an apron belt 18b is wound. The front roller
pair 17 includes, as a drafting roller that drafts the sliver S, a front
bottom roller 17a and a front top roller 17b that face each other across
the traveling path R. The back-bottom roller 14a, the third bottom
roller 15a, the middle bottom roller 16a, and the front bottom roller 17a
are rotatably driven by drive motors provided on the second end frame 5
or by drive motors provided to each of the spinning unit 2.
[0017] A plurality of roller pairs 14, 15, 16, and 17 make the sliver S,
which is supplied from a can (depiction omitted), travel from the
upstream side to the downstream side while drafting, and supplies the
fiber band F to the air spinning device 7. In the following description,
the direction along the traveling path R is referred to as "drafting
direction". The upstream side in the drafting direction is simply
referred to as "upstream side" and the downstream side in the drafting
direction is simply referred to as "downstream side".
[0018] The back-bottom roller 14a is rotatably supported on a
back-roller housing 61. The third bottom roller 15a is rotatably
supported on a third roller housing 62. The middle bottom roller 16a is
rotatably supported on a middle roller housing 63. The front bottom
roller 17a is rotatably supported on a front roller housing 64. The
respective roller housings 61, 62, 63, and 64 are mounted on a machine
frame 20. The respective bottom rollers 14a, 15a, 16a, and 17a are
made to rotate at different rotational speeds from one another so as to
become faster toward the downstream side.
[0019] The respective top rollers 14b, 15b, 16b, and 17b are rotatably
supported on a drafting cradle 65. The top rollers 14b, 15b, 16b, and
17b are brought into contact with the bottom rollers 14a, 15a, 16a, and
17a at a certain pressure and are driven to rotate, respectively.
[0020] The drafting cradle 65 is provided so as to be turnable about a
spindle 67 to a position at which the top rollers 14b, 15b, 16b, and 17b
come into contact with the bottom rollers 14a, 15a, 16a, and 17a at the
certain pressure, respectively, and to a position at which the top rollers
14b, 15b, 16b, and 17b are spaced apart from the bottom rollers 14a,
15a, 16a, and 17a, respectively. The drafting cradle 65 rotatably
supports the respective top rollers 14b, 15b, 16b, and 17b of the drafting
device 6 that adjacent spinning units 2 making a pair each include.
[0021] In a state that the back-roller pair 14 is located on the upper side
and the front roller pair 17 is located on the lower side with respect to
the vertical direction, the drafting device 6 is arranged at an angle in a
direction that the bottom rollers 14a, 15a, 16a, and 17a are located on
the lower side with respect to the top rollers 14b, 15b, 16b, and 17b,
respectively.
[0022] On the upstream side of the back-roller pair 14, a guide member
71 is arranged (omitted in FIG. 1). On the guide member 71, a through
hole 71a is provided through which the sliver S is passed. The guide
member 71 guides, onto the traveling path R, the sliver S supplied from
the can (depiction omitted).
[0023] Between the third roller pair 15 and the middle roller pair 16, a
regulating member 72 is arranged (omitted in FIG. 1). On the
regulating member 72, provided is a through hole 72a through which the
sliver S is passed. The regulating member 72 regulates the width of
the sliver S to the width of the through hole 72a.
[0024] On the back-bottom roller 14a, a cleaning device 100 is
provided (omitted in FIG. 1). The cleaning device 100 removes fibers
that adhered on the outer circumferential surface of the back-bottom
roller 14a. On the third bottom roller 15a also, as with the
back-bottom roller 14a, a cleaning device 100 that removes fibers that
adhered on the outer circumferential surface of the third bottom roller
15a is provided.
[0025] On the opposite side of the top rollers 14b, 15b, and 16b with
respect to the bottom rollers 14a, 15a, and 16a, a fiber recovery device
80 is arranged (omitted in FIG. 1). As illustrated in FIG. 3, the fiber
recovery device 80 includes a main unit portion 81. On the main unit
portion 81, a suction path 82 is provided. On the main unit portion 81,
a suction inlet 83 is further provided. In FIG. 3, to illustrate the suction
inlet 83, a part of the main unit portion 81 is illustrated being broken.
The suction inlet 83 is provided only one for the drafting device 6, and
is facing the third bottom roller 15a of the third roller pair 15 that is the
third roller pair from the downstream side.
[0026] On the opposite side of the suction inlet 83 in the suction path
82, a suction pipe 90 is connected. The suction pipe 90 is connected to
a blower (depiction omitted) that generates a suction airflow.
Accordingly, pieces of fibers that arose in the drafting device 6 are
sucked from the suction inlet 83, pass through the suction path 82 and
the suction pipe 90, and reach a fiber discharge device (depiction
omitted) provided in the vicinity of the blower.
[0027] Next, details of the cleaning device 100 will be described. In
the following description, the cleaning device 100 provided on the
back-bottom roller 14a will be described as an example. The cleaning
device 100 provided on the third bottom roller 15a has the same
configuration as that of the cleaning device 100 that is provided on the
back-bottom roller 14a.
[0028] As illustrated in FIGS. 4 and 5, the cleaning device 100 includes
a magnet case 110, an inner yoke 120, an outer yoke 130, a pair of
magnets (pressing unit) 140, and a scraper 150. The cleaning device
100 is mounted on the back-bottom roller 14a by the magnetic force of
the magnets 140.
[0029] The magnet case 110 is made of resin and is a case to
accommodate the magnets 140. The magnet case 110 is formed in a
box shape for which the side facing the back-bottom roller 14a is open.
The magnet case 110 includes a base plate 111, a pair of arms 112 (see
FIG. 4), a pair of grasping portions 113, a pair of engaging portions 114,
and screws 115.
[0030] The base plate 111 constitutes a bottom portion of the
box-shaped magnet case 110. On the base plate 111, formed are holes
through which the screws 115 can be inserted. The pair of arms 112,
as illustrated in FIG. 4, are respectively extending toward the outside
from both end portions in the axial direction of the back-bottom roller
14a in the base plate 111. The axial direction of the back-bottom roller
14a is the extending direction of a rotating shaft of the roller. As
illustrated in FIGS. 2 and 4, on the upper surface of the back-roller
housing 61, stoppers 66 are provided. The stopper 66 has a folded
portion 66a that is folded back toward the lower side from the upper
surface of the back-roller housing 61. By locating the stoppers 66 on
the more downstream side in the rotational direction of the back-bottom
roller 14a than the arms 112, the arms 112 come into contact with the
distal end portions of the folded portions 66a, and the rotation of the
cleaning device 100 attempting to rotate integrally with the back-bottom
roller 14a is prevented.
[0031] The pair of grasping portions 113 is a region that is grasped by
the operator when removing the cleaning device 100 mounted on the
back-bottom roller 14a. The pair of grasping portions 113 are
respectively provided on both end portions in the axial direction of the
back-bottom roller 14a in the base plate 111. The grasping portions
113 are extending from the base plate 111 toward the downstream side
in the rotational direction of the back-bottom roller 14a.
[0032] The pair of engaging portions 114 respectively engage with
engaging holes 154a (see FIG. 8 and others) provided on the scraper
150, thereby securing the scraper 150 to the magnet case 110 by
snap-fit. By securing the scraper 150 to the magnet case 110 by
snap-fit, it is possible to replace the scraper 150 easily.
[0033] The inner yoke 120 and the outer yoke 130 vary the direction
that the magnetic force of the magnets 140 is exerted such that the
magnetic force of the magnets 140 is exerted toward the back-bottom
roller 14a side. The inner yoke 120 is a member having a substantially
U-shaped cross section. The inner yoke 120 is arranged on the surface
of the base plate 111 on the back-bottom roller 14a side so that the open
side of the substantially U-shaped cross section faces the back-bottom
roller 14a. The outer yoke 130 is a plate-like member and is arranged
on the surface of the opposite side of the back-bottom roller 14a with
5 the base plate 111 interposed.
[0034] On the outer yoke 130, holes are formed through which the
screws 115 can be inserted. On the inner yoke 120, threaded holes are
formed that can secure the screws 115. By inserting the screws 115
from the outer yoke 130 toward the inner yoke 120 with the base plate
10 111 interposed, the inner yoke 120 and the outer yoke 130 are secured to
the magnet case 110. Note that, the inner yoke 120 and the outer yoke
130 may be secured to the magnet case 110 by fixtures other than the
screws 115.
[0035] The pair of magnets 140 presses, by the action that the magnets
15 140 are attracted to the back-bottom roller 14a by the magnetic force,
the scraper 150 toward the outer circumferential surface of the
back-bottom roller 14a. The pair of magnets 140 is, as illustrated in
FIGS. 2 and 5, arranged in juxtaposition along the axial direction of the
back-bottom roller 14a so as to avoid a middle portion in the axial
20 direction of the back-bottom roller 14a. That is, the pair of magnets
140 is arranged so as to avoid, in the outer circumferential surface of the
back-bottom roller 14a, the region with which the sliver S comes in
contact. The magnets 140 are fixed to the inner yoke 120 by an
adhesive, an adhesive tape, or the like.
25 [0036] The scraper 150 is extending along the width direction of the
back-bottom roller 14a and, by the magnetic force of the magnets 140,
12
is pressed onto the outer circumferential surface of the back-bottom
roller 14a that rotates. Note that, the width direction of the
back-bottom roller 14a is the extending direction of the rotating shaft of
the back-bottom roller 14a. The scraper 150 removes, by being
5 pressed onto the outer circumferential surface of the back-bottom roller
14a, fibers adhering on the outer circumferential surface of the
back-bottom roller 14a. The scraper 150 is made of resin. The
scraper 150 wears out by contacting with the back-bottom roller 14a.
When the scraper 150 wears out, the scraper 150 is removed from the
10 magnet case 110 of the cleaning device 100 and replaced.
[0037] As illustrated in FIGS. 5 to 8, the scraper 150 includes a scraper
main-unit portion 151, a scraper edge portion 152, a pair of positioning
claw portions 153, a pair of engaging pieces 154, and projecting
portions 155.
15 [0038] The scraper main-unit portion 151 is a plate-like member facing
the outer circumferential surface of the back-bottom roller 14a, and is
extending along the width direction of the back-bottom roller 14a.
Furthermore, the scraper main-unit portion 151, when viewed along the
axial direction of the back-bottom roller 14a, is further curved so as to
20 lie along the outer circumferential surface of the back-bottom roller 14a.
On the end portion of the downstream side in the rotational direction of
the back-bottom roller 14a in the scraper main-unit portion 151, a cutout
portion 151a is provided.
[0039] The cutout portion 151a is provided at a location including a
25 substantially middle portion in the width direction of the back-bottom
roller 14a. In more detail, the cutout portion 151a is provided, in the
13
width direction of the back-bottom roller 14a, at a location including a
region in which the sliver that wound around the outer circumferential
surface of the back-bottom roller 14a passes when the back-roller pair
14 drafts the sliver S.
5 [0040] The scraper edge portion 152 is provided on the end portion of
the upstream side in the rotational direction of the back-bottom roller
14a in the scraper main-unit portion 151. The scraper edge portion
152 is provided so as to project from the scraper main-unit portion 151
toward the outer circumferential surface of the back-bottom roller 14a.
10 In the present embodiment, the scraper main-unit portion 152 is brought
into line contact along the width direction of the back-bottom roller 14a
with respect to the outer circumferential surface of the back-bottom
roller 14a. For example, the distal end portion of the scraper edge
portion 152 may be formed in a circular arc shape having a small radius
15 in cross section so as to be possible to be brought into line contact with
the outer circumferential surface of the back-bottom roller 14a.
[0041] As illustrated in FIG. 5, on the outer circumferential surface of
the back-bottom roller 14a, the region that the distal end portion of the
scraper edge portion 152 comes into contact is denoted as a contact
20 point T. On a tangent line that passes the contact point T on the
back-bottom roller 14a when viewed along the axial direction of the
back-bottom roller 14a, the region extending from the contact point T
toward the upstream side of the back-bottom roller 14a is denoted as a
tangent-line upstream portion L. In the outer surface of the scraper
25 edge portion 152, the surface facing toward the upstream side in the
rotational direction of the back-bottom roller 14a is denoted as an
14
upstream-side outer surface 152a. When viewed along the axial
direction of the back-bottom roller 14a, the angle that is formed by the
tangent-line upstream portion L and the upstream-side outer surface
152a is denoted as an angle a.
5 [0042] The scraper edge portion 152 is formed such that, when being
brought into contact with the outer circumferential surface of the
back-bottom roller 14a, the angle a is to be an obtuse angle. The
scraper edge portion 152 may be formed such that the angle a is to be
greater than 90° but less than or equal to 135°. Furthermore, the
10 scraper edge portion 152 may be formed such that the angle a is to be
greater than or equal to 100° but less than or equal to 120°. Moreover,
the scraper edge portion 152 may be formed such that the angle a is to
be greater than or equal to 100° but less than or equal to 110°.
[0043] Note that, the upstream-side outer surface 152a does not include
15 the circular arc shaped region that is provided at the distal end portion of
the scraper edge portion 152 to bring the scraper edge portion 152 into
line contact. The scraper edge portion 152 comes into contact with the
outer circumferential surface of the back-bottom roller 14a at a location
on the lower side than a horizontal line that passes the axis of the
20 back-bottom roller 14a when viewed along the axial direction of the
back-bottom roller 14a.
[0044] The pair of positioning claw portions 153 is, in the end portion
of the downstream side in the rotational direction of the back-bottom
roller 14a in the scraper main-unit portion 151, provided in regions that
25 the cutout portion 151 a is not provided. That is, the pair of positioning
claw portions 153 is, in the end portion of the downstream side in the
15
rotational direction of the back-bottom roller 14a in the scraper
main-unit portion 151, adjacent by interposing the cutout portion 151a.
The positioning claw portions 153 are provided so as to project from the
scraper main-unit portion 151 toward the outer circumferential surface
5 of the back-bottom roller 14a. In the present embodiment, at the distal
end portion of the positioning claw portion 153, a contact surface
portion 153a that comes into contact with the outer circumferential
surface of the back-bottom roller 14a is provided. The contact surface
portions 153a come into contact with the outer circumferential surface
10 of the back-bottom roller 14a, thereby bringing the positioning claw
portions 153 into surface contact with respect to the outer
circumferential surface of the back-bottom roller 14a.
[0045] Herein, the cutout portion 151a is provided at a location
including a region in which the sliver that wound around the outer
15 circumferential surface of the back-bottom roller 14a passes. That is,
the pair of positioning claw portions 153 is provided at locations
avoiding the region through which the sliver that wound around the
outer circumferential surface of the back-bottom roller 14a passes.
[0046] The pair of engaging pieces 154 is provided on the surface (the
20 surface on the side the magnets 140 face) of the opposite side with
respect to the side facing the back-bottom roller 14a in the scraper
main-unit portion 151. The pair of engaging pieces 154 is provided
leaving a certain distance in the rotational direction of the back-bottom
roller 14a. The distance of the pair of engaging pieces 154 is smaller
25 than the length in the rotational direction of the back-bottom roller 14a
in the scraper main-unit portion 151. The pair of engaging pieces 154
16
is provided in substantially the middle in the rotational direction of the
back-bottom roller 14a in the scraper main-unit portion 151. That is,
the scraper main-unit portion 151 is extending toward the more
upstream side in the rotational direction of the back-bottom roller 14a
5 than the pair of engaging pieces 154 and is extending toward the
downstream side in the rotational direction of the back-bottom roller
14a.
[0047] As just described, by configuring the scraper main-unit portion
151 so as to be extending on the more upstream side and the more
10 downstream side in the rotational direction of the back-bottom roller
14a than the pair of engaging pieces 154, it is possible to ensure a wide
interval between the scraper edge portion 152 and the positioning claw
portions 153. Accordingly, when the scraper 150 is brought into
contact with the outer circumferential surface of the back-bottom roller
15 14a, the positioning of the cleaning device 100 can be made.
[0048] On the pair of engaging pieces 154, respective engaging holes
154a are provided. With the engaging holes 154a of the pair of
engaging pieces 154, the engaging portions 114 of the magnet case 110
engage.
20 [0049] The projecting portions 155 are provided on the surface facing
the outer circumferential surface of the back-bottom roller 14a in the
scraper main-unit portion 151, and are projecting from the outer surface
of the scraper main-unit portion 151 toward the outer circumferential
surface of the back-bottom roller 14a. The projecting portions 155 are
25 extending along the rotational direction of the back-bottom roller 14a.
The projecting portions 155 are extending from near the end portion of
17
the upstream side in the rotational direction of the back-bottom roller
14a in the scraper main-unit portion 151 up to the end portion (the
positioning claw portions 153) of the downstream side in the rotational
direction of the back-bottom roller 14a. That is, the projecting
5 portions 155 are provided on the more downstream side than the scraper
edge portion 152 and on the more upstream side than the positioning
claw portions 153.
[0050] In the present embodiment, four pieces of the projecting
portions 155 are provided. The projecting portions 155 are provided
10 so as to run through the region sandwiched between pressing areas Q
(see FIG. 6) in which the magnets 140 press the scraper main-unit
portion 151, and the outer circumferential surface of the back-bottom
roller 14a. In the present embodiment, two pieces of the projecting
portions 155 are provided so as to run through the region sandwiched
15 between the pressing area Q by one magnet 140 of the pair of magnets
140, and the outer circumferential surface of the back-bottom roller 14a;
and the remaining two pieces of the projecting portions 155 are
provided so as to run through the region sandwiched between the
pressing area Q by the other magnet 140 of the pair of magnets 140, and
20 the outer circumferential surface of the back-bottom roller 14a.
[0051] The surfaces of the back-bottom roller 14a side in the projecting
portions 155 are formed in a circular arc shape so as to lie along the
outer circumferential surface of the back-bottom roller 14a. In a state
that the scraper edge portion 152 and the positioning claw portions 153
25 are in contact with the outer circumferential surface of the back-bottom
roller 14a, the projecting portions 155 are provided so as to have a slight
18
gap between the projecting portion 155 and the outer circumferential
surface of the back-bottom roller 14a. Accordingly, the scraper 150
can reliably bring the scraper edge portion 152 into contact with the
outer circumferential surface of the back-bottom roller 14a.
5 [0052] In a state that the scraper edge portion 152 and the positioning
claw portions 153 are in contact with the outer circumferential surface
of the back-bottom roller 14a, the projecting portions 155 may be in
contact with the outer circumferential surface of the back-bottom roller
14a. In this case, the projecting portions 155 can, immediately after
10 the cleaning device 100 is installed on the back-bottom roller 14a,
suppress the abrasion of the scraper edge portion 152 and the like.
[0053] Furthermore, the projecting portions 155 are provided at
locations avoiding the region in which the sliver that wound around the
outer circumferential surface of the back-bottom roller 14a passes. In
15 the present embodiment, the projecting portions 155 are provided at
locations avoiding the substantially middle portion in the width
direction of the back-bottom roller 14a.
[0054] Herein, on the scraper 150, the amount of abrasion may be
different at one end portion and the other end portion, in the width
20 direction of the back-bottom roller 14a. For example, when grooves
provided on the outer circumferential surface of the back-bottom roller
14a are inclined having an angle other than the right angle with respect
to the rotational direction of the back-bottom roller 14a, the amount of
abrasion may, due to the inclination of the grooves, be different at one
25 end portion of the scraper 150 and the other end portion thereof.
Specifically, because the grooves provided on the outer circumferential
19
surface of the back-bottom roller 14a are inclined, one end portion of
the scraper 150 may be attracted strongly toward the rotational direction
side of the back-bottom roller 14a, as compared with the other end
portion, for example. In this case, in the scraper 150, the way of
5 contact with respect to the outer circumferential surface of the
back-bottom roller 14a is to be different at the one end portion and the
other end portion. Accordingly, the amount of abrasion may be
different at one end portion of the scraper 150 and the other end portion
thereof. When the grooves of the back-bottom roller 14a are inclined
10 upward toward the right, there is a tendency that the scraper 150 is
pushed in the right-hand direction and the right-hand side portion wears
out fast. When the grooves of the back-bottom roller 14a are inclined
downward toward the right, there is a tendency that the scraper 150 is
pushed in the left-hand direction and the left-hand side portion wears
15 out fast.
[0055] Furthermore, for example, due to the variance and others in the
manufacturing accuracy of the various portions, in the scraper 150, the
way of contact with respect to the outer circumferential surface of the
back-bottom roller 14a may be different at the one end portion and the
20 other end portion. Accordingly, the amount of abrasion may be
different at one end portion of the scraper 150 and the other end portion
thereof.
[0056] Because of this, the pair of magnets 140 presses the scraper 150
such that one end portion of the scraper 150 and the other end portion
25 thereof are pressed at different strengths from each other so that the
amount of abrasion of the scraper 150 becomes uniform. Specifically,
20
in the pair of magnets 140 that biases the scraper 150, the magnetic
force of the pair of magnets 140 is different from each other such that
the amount of abrasion of the scraper 150 becomes uniform. For
example, the magnetic force of the magnet 140 disposed on the side in
5 which the amount of abrasion of the scraper 150 is great is small with
respect to the magnetic force of the other magnet 140.
[0057] The present embodiment is thus configured, and in the cleaning
device 100, the angle a being formed by the tangent-line upstream
portion L of the bottom roller 14a or 15a, with which the scraper 150
10 comes into contact, and the upstream-side outer surface 152a of the
scraper edge portion 152 is an obtuse angle. Because of this, the
scraper edge portion 152 is in a state of scraping off fibers adhering on
the outer circumferential surface of the bottom roller 14a or 15a. Thus,
the scraper edge portion 152 is restrained from escaping toward the
15 downstream side in the rotational direction of the bottom roller 14a or
15a, and it is possible to remove the fibers adhering on the outer
circumferential surface of the bottom roller 14a or 15a more reliably.
[0058] By making the angle a, which is formed by the tangent-line
upstream portion L and the upstream-side outer surface 152a, be an
20 obtuse angle, the scraper edge portion 152 can be brought into contact
with the outer circumferential surface of the bottom roller 14a or 15a,
and regardless of the type of the sliver S to be drafted, it is possible to
remove the fibers reliably.
[0059] For example, when the angle a being formed by the tangent-line
25 upstream portion L of the bottom roller 14a or 15a and the
upstream-side outer surface 152a of the scraper edge portion 152 is
21
increased, there is a need to make the scraper edge portion thin. Thus,
when the angle a being formed by the tangent-line upstream portion L
and the upstream-side outer surface 152a is made to be greater than 90°
but less than or equal to 135°, it is possible to remove the fibers
5 adhering on the outer circumferential surface of the bottom roller 14a or
15a more reliably while ensuring the thickness of the scraper edge
portion 152 and keeping the strength thereof.
[0060] Note that, by forming the scraper edge portion 152 so that the
angle a is greater than or equal to 100° but less than or equal to 120°, it
10 is possible to remove the fibers adhering on the outer circumferential
surface of the bottom roller 14a or 15a even more reliably while
ensuring the thickness of the scraper edge portion 152 and keeping the
strength thereof. Furthermore, by forming the scraper edge portion
152 so that the angle a is to be greater than or equal to 100° but less
15 than or equal to 110°, it is possible to remove the fibers adhering on the
outer circumferential surface of the bottom roller 14a or 15a further
reliably while ensuring the thickness of the scraper edge portion 152
and keeping the strength thereof.
[0061] On the scraper main-unit portion 151 of the scraper 150, the
20 projecting portions 155 projecting toward the bottom roller 14a or 15a
side are provided. As just described, when the projecting portions 155
are provided, because the projecting portions 155 come into contact
with the outer circumferential surface of the bottom roller 14a or 15a, it
is possible to restrain the scraper main-unit portion 151 from wearing
25 out. Accordingly, it is avoided that the scraper main-unit portion 151
wears out and the scraper 150 deforms greatly, for example, and it is
22
possible to prolong the usable period of the scraper 150.
[0062] The projecting portions 155 are provided in the region
sandwiched between the pressing areas Q in which the magnets 140
press the scraper main-unit portion 151, and the outer circumferential
5 surface of the bottom roller 14a or 15a. In the regions pressed by the
magnets 140, abrasion is likely to be promoted. However, because the
projecting portions 155 are provided in the regions sandwiched between
the pressing areas Q and the outer circumferential surface of the bottom
roller 14a or 15a, it is possible to further restrain the scraper main-unit
10 portion 151 from wearing out.
[0063] The projecting portions 155 are provided at locations avoiding
the region in which the sliver that wound around the outer
circumferential surface of the bottom roller 14a or 15a passes. In this
case, because the fibers adhering on the outer circumferential surface of
15 the bottom roller 14a or 15a are never to be pressed by the projecting
portions 155, it is possible to prevent the projecting portions 155 from
interfering with the removal of fibers by the scraper edge portion 152.
[0064] The pair of magnets 140 presses the scraper 150 such that one
end portion of the scraper 150 and the other end portion thereof are
20 pressed at different strengths from each other so that the amount of
abrasion of the scraper 150 becomes uniform. For example, by the
orientation of grooves (grooves m illustrated in FIG. 13) provided on the
outer circumferential surface of the bottom roller 14a or 15a, and by the
variance and others in the manufacturing accuracy of various portions,
25 the bias in abrasion of the scraper 150 may occur. Even when such
bias in abrasion occurs, by providing the magnets 140 in the
23
above-described configuration, it is possible to suppress the bias in
abrasion of the scraper 150 and prolong the usable period of the scraper
150. As just described, on the outer circumferential surface of the
drafting roller, a plurality of grooves in a shape inclined at an angle
5 other than the right angle with respect to the width direction (direction
of a rotating shaft) of the drafting roller are formed, and in accordance
with the inclination of the grooves, the pressing unit can change a
pressing force in the width direction of the drafting roller.
[0065] The scraper edge portion 152 comes into contact with the outer
10 circumferential surface of the bottom roller 14a or 15a at a location
lower than the horizontal line that passes the axis of the bottom roller
14a or 15a when viewed along the axial direction of the bottom roller
14a or 15a. In this case, it is possible to efficiently drop the fibers that
are removed from the bottom roller 14a or 15a, to the outside (lower
15 side) of the scraper 150. On the lower side of the bottom roller 14a or
15a, because the fiber recovery device 80 is arranged, it is possible to
efficiently recover the fibers removed by the cleaning device 100 by the
fiber recovery device 80.
[0066] Herein, when the angle a by the tangent-line upstream portion L
20 of the bottom roller 14a or 15a and by the upstream-side outer surface
152a of the scraper edge portion 152 is made to be an obtuse angle, the
scraper 150 and others are to be located more downstream in the
rotational direction of the bottom roller 14a or 15a than the contact point
T at which the scraper edge portion 152 comes into contact with the
25 outer circumferential surface of the bottom roller 14a or 15a. Thus, by
bringing the scraper edge portion 152 into contact with the outer
24
circumferential surface of the bottom roller 14a or 15a at the
above-described location, the scraper edge portion 152 can be brought
into contact with the outer circumferential surface of the bottom roller
14a or 15a such that the angle by the tangent-line upstream portion L
5 and the upstream-side outer surface 152a is to be an obtuse angle while
ensuring the placement space of the members such as the scraper 150,
without interfering with the placement of the top roller 14b or 15b.
[0067] The scraper 150 includes the pair of positioning claw portions
153. The pair of positioning claw portions 153 is provided at locations
10 avoiding the region in which the sliver that wound around the outer
circumferential surface of the bottom roller 14a or 15a passes. In this
case, because the fibers adhering on the outer circumferential surface of
the bottom roller 14a or 15a are never to be pressed by the positioning
claw portions 153, it is possible to prevent the positioning claw portions
15 153 from interfering with the removal of fibers by the scraper edge
portion 152.
[0068] Next, a first modification of the scraper will be described. As
illustrated in FIGS. 9 to 11, a scraper 150A according to the first
modification includes projecting portions 155A and projecting portions
20 155B. In the scraper 150A in the first modification, the configurations
other than the projecting portions 155A and 155B are the same as those
of the scraper 150 in the embodiment, and by giving identical reference
signs, the explanations thereof are omitted. The scraper 150A in the
first modification is, as with the scraper 150 in the embodiment,
25 provided on the cleaning device 100.
[0069] The projecting portions 155A are of the configuration the same
25
as that of the projecting portions 155 provided on the scraper 150.
Two pieces of the projecting portions 155B, when the scraper main-unit
portion 151 is viewed from the back-bottom roller 14a side, are
provided so as to cover a whole of the pressing areas Q that are pressed
5 by the magnets 140. The projecting portions 155B are projecting from
the outer surface of the scraper main-unit portion 151 toward the outer
circumferential surface of the back-bottom roller 14a. That is, the
projecting portions 155B are provided in regions sandwiched between
the pressing areas Q by the magnets 140 and the outer circumferential
10 surface of the bottom roller 14a. The surfaces of the back-bottom
roller 14a side in the projecting portions 155B are formed in a circular
arc shape so as to lie along the outer circumferential surface of the
back-bottom roller 14a. The surfaces of the back-bottom roller 14a
side in the projecting portions 155A and the surfaces of the back-bottom
15 roller 14a side in the projecting portions 155B are on the same surface
without causing a stepped portion and the like.
[0070] As with the projecting portions 155 described in the
embodiment, in a state that the scraper edge portion 152 and the
positioning claw portions 153 are in contact with the outer
20 circumferential surface of the back-bottom roller 14a, the projecting
portions 155B are provided so as to have a slight gap between the outer
circumferential surface of the back-bottom roller 14a and the projecting
portion 155B. Alternatively, in a state that the scraper edge portion
152 and the positioning claw portions 153 are in contact with the outer
25 circumferential surface of the back-bottom roller 14a, the projecting
portions 155B may be in contact with the outer circumferential surface
26
of the back-bottom roller 14a.
[0071] As just described, in addition to the projecting portions 155A,
by including the projecting portions 155B provided so as to cover the
whole of the pressing areas Q pressed by the magnets 140, the scraper
5 150A can further restrain the scraper main-unit portion 151 from
wearing out. Consequently, it is possible to further prolong the usable
period of the scraper 150A.
[0072] Next, a second modification of the scraper will be described.
As illustrated in FIG. 12, a scraper 150B according to the second
10 modification includes stopper portions 160 that are added to the scraper
150A in the first modification. The configurations other than the
stopper portions 160 in the scraper 150B are the same as those of the
scraper 150A, and by giving identical reference signs, the explanations
thereof are omitted. The scraper 150B in the second modification is,
15 as with the scraper 150 in the embodiment, provided on the cleaning
device 100.
[0073] As illustrated in FIGS. 12 to 14, on both end portions (both end
portions in the width direction of the back-bottom roller 14a) of the
scraper main-unit portion 151 in the scraper 150B, the respective
20 stopper portions 160 are provided. The stopper portions 160 are
projecting from the scraper main-unit portion 151 toward the outer
circumferential surface of the back-bottom roller 14a. In the present
embodiment, the stopper portions 160 are provided at the locations
closest to the ends in the width direction of the back-bottom roller 14a
25 in the scraper main-unit portion 151. The stopper portions 160 are
provided near the middle in the rotational direction of the back-bottom
27
roller 14a in the scraper main-unit portion 151.
[0074] Herein, as illustrated in FIG. 13, on the outer circumferential
surface of the back-bottom roller 14a, a drafting surface H1 and smooth
surfaces H2 are provided. On the drafting surface H1, a plurality of
5 grooves m extending in the direction intersecting with the rotational
direction of the back-bottom roller 14a are provided. By being
provided with the grooves m, when drafting the sliver S by the
back-bottom roller 14a, the slippage of the sliver S with respect to the
back-bottom roller 14a is suppressed. The drafting surface H1 is
10 extending over the entire area in the circumferential direction of the
outer circumferential surface of the back-bottom roller 14a.
[0075] On the smooth surface H2, being different from the drafting
surface H1, the grooves m are not provided. The smooth surface H2
has a smoother surface than that of the drafting surface H1. The
15 smooth surface H2 is extending over the entire area in the
circumferential direction of the outer circumferential surface of the
back-bottom roller 14a. In the present embodiment, the region on
which the smooth surface H2 in the back-bottom roller 14a is provided
has a small diameter with respect to the region on which the drafting
20 surface H1 in the back-bottom roller 14a is provided.
[0076] The drafting surface H1 and the smooth surfaces H2 are
provided at locations different from each other in the width direction of
the back-bottom roller 14a. In the present embodiment, in the width
direction of the back-bottom roller 14a, the smooth surfaces H2 are
25 provided at two locations on the outer circumferential surface of the
back-bottom roller 14a so as to sandwich the drafting surface H1.
28
[0077] As illustrated in FIG. 13, in a state that the scraper 150B was
brought into contact with the outer circumferential surface of the
back-bottom roller 14a, the positioning claw portions 153 and the
scraper edge portion 152 come into contact with the drafting surface H1.
5 The stopper portions 160 are projecting toward the smooth surfaces H2.
[0078] Herein, a distance between the distal end portion of the stopper
portion 160 and the smooth surface H2 is denoted as K1 (see FIG. 13).
As illustrated in FIG. 14, a distance between the surface (hereinafter
referred to as "pressing surface 151b") that is pressed by the magnets
10 140 in the scraper main-unit portion 151 and the outer circumferential
surface (the drafting surface H1) of the back-bottom roller 14a is
denoted as K2. The distance K1 is narrower than the distance K2.
That is, the projecting height of the stopper portions 160 and the
thickness of the scraper main-unit portion 151 are set, so as to satisfy
15 this condition of the distance K1 and the distance K2.
[0079] As just described, in the scraper 150B, when the scraper edge
portion 152 and the like wear out and a whole of the scraper 150 comes
close to the outer circumferential surface side of the back-bottom roller
14a, the distal end of the stopper portion 160 comes into contact with
20 the smooth surface H2. Because the stopper portions 160 are provided
on both end portions of the scraper main-unit portion 151, the operator
can visually recognize the stopper portions 160 easily. Thus, the
operator can, by visually recognizing the distance between the distal end
portion of the stopper portion 160 and the smooth surface H2, easily
25 understand a state of abrasion of the scraper 150B. Accordingly, the
operator can easily understand the time to replace the scraper 150B.
29
[0080] The distance K1 is narrower than the distance K2. Thus, at the
time the distal end portion of the stopper portion 160 first comes into
contact with the smooth surface H2, there is some thickness remaining
to the scraper main-unit portion 151. That is, the operator can
5 understand, by checking whether the stopper portion 160 has come into
contact with the smooth surface H2, the time to replace the scraper
150B, before the scraper main-unit portion 151 wears out and has holes
and the like.
[0081] The stopper portions 160 are extending toward the smooth
10 surface H2 of the back-bottom roller 14a. When the scraper edge
portion 152 and the like wear out, the stopper portions 160 come into
contact with the smooth surfaces H2. Thus, the abrasion of the stopper
portions 160 is reduced as compared with when the stopper portions 160
are in contact with the drafting surface H1 having the grooves m.
15 Furthermore, because the stopper portions 160 come into contact with
the smooth surfaces H2, the scraper 150B is restrained from further
nearing the drafting surface H1. Accordingly, the scraper main-unit
portion 151 is restrained from wearing out and having holes and the
like, and the magnets 140 are restrained from being brought into contact
20 directly with the drafting surface H1.
[0082] The color of the distal end portion of the stopper portion 160
may be different from the color of the base portion of the stopper
portion 160. For example, the distal end portion of the stopper portion
160 may be colored in a color different from that of the base portion of
25 the stopper portion 160. In this case, when the distal end portion of the
stopper portion 160 comes into contact with the smooth surface H2 and
30
wears out, the colored portion of the distal end portion disappears.
Thus, the operator can visually recognize easily that the stopper portion
160 has come into contact with the smooth surface H2.
[0083] The stopper portions 160 are not limited to being provided on
5 both end portions of the scraper main-unit portion 151. The stopper
portion 160 may be provided on either one of the two end portions of
the scraper main-unit portion 151.
[0084] As in the foregoing, one embodiment of the present disclosure
has been described. The disclosure, however, is not limited to the
10 above-described embodiment. For example, the cleaning device 100
may, out of the various drafting rollers that the drafting device 6
includes, be provided on a drafting roller other than the back-bottom
roller 14a and the third bottom roller 15a. For example, when the
configuration of the drafting device 6 is different from that of the
15 embodiment and is of a three-line type that includes no third roller pair
15 but includes three drafting roller pairs, it is preferable that the
cleaning device 100 be provided (mounted) only on the back-bottom
roller 14a. However, the cleaning device 100 may be provided on a
drafting roller other than the back-bottom roller 14a. The angle a
20 being formed by the tangent-line upstream portion L of the drafting
roller (for example, the bottom roller 14a or 15a), on which the cleaning
device 100 is mounted, and the upstream-side outer surface 152a of the
scraper edge portion 152 only needs to be an obtuse angle, but is not
indispensable to be greater than 90° but less than or equal to 135°.
25 Furthermore, it is not indispensable to provide the projecting portions
155, 155A, and 155B on the scrapers 150, 150A, and 150B,
31
respectively. When the projecting portions 155 and the like are
provided on the scraper main-unit portion 151, it is not indispensable to
provide them in the region sandwiched between the pressing areas Q, in
which the magnets 140 press the scraper main-unit portion 151, and the
5 outer circumferential surface of the bottom roller 14a or 15a. It is not
indispensable that, in the width direction of the bottom roller 14a or 15a,
the projecting portions 155, 155A, and 155B are provided at locations
avoiding the region in which the sliver that wound around the outer
circumferential surface of the bottom roller 14a or 15a passes. The
10 stopper portions 160 of the scraper 150B in the second modification
may be provided on the scraper 150 in the embodiment.
[0085] The magnets 140 may press the scraper 150 such that both end
portions of the scraper 150 are pressed onto the bottom roller 14a or 15a
with the same strength to each other. The scraper edge portion 152
15 may come into contact with the outer circumferential surface of the
bottom roller 14a or 15a not at a location on the lower side than the
horizontal line that passes the axis of the bottom roller 14a or 15a when
viewed along the axial direction of the bottom roller 14a or 15a. The
positioning claw portions 153 may be provided not at locations avoiding
20 the region in which the sliver that wound around the outer
circumferential surface of the bottom roller 14a or 15a passes.
[0086] While the scraper 150 has been pressed toward the outer
circumferential surface of the bottom roller 14a or 15a by the magnets
140, it may be pressed by a pressing unit other than the magnets 140.
25 [0087] As another modification, a cleaning device may include no
projecting portions 155, 155A, or 155B in the above-described cleaning
32
device 100 and may, in addition, include no configuration in which the
angle a being formed by the tangent-line upstream portion L of the
bottom roller 14a or 15a and the upstream-side outer surface 152a of the
scraper edge portion 152 is an obtuse angle. The cleaning device in
5 this modification is provided with the above-described pair of magnets
140. In the cleaning device in this modification, the magnets 140 press
a scraper such that one end portion of the scraper and the other end
portion thereof are pressed at different strengths from each other so that
the amount of abrasion of the scraper becomes uniform. The cleaning
10 device in this modification, by having the configuration of the
above-described magnets 140, can suppress the bias in abrasion of the
scraper and can prolong the usable period of the scraper. That is, the
cleaning device for a drafting roller in this modification is a cleaning
device for a drafting roller that includes a scraper extending along the
15 width direction of the drafting roller and configured to come into
contact with the outer circumferential surface of the drafting roller, and
is provided with a pressing unit that presses the scraper toward the outer
circumferential surface of the drafting roller, and the pressing unit
presses the scraper such that one end portion in the width direction of
20 the drafting roller in the scraper and the other end portion thereof are
pressed at different strengths from each other.
[0088] By providing the cleaning device 100 on the drafting device 6 of
the spinning unit 2 provided with the air spinning device 7, it is possible
to remove fibers adhering on the bottom roller 14a or 15a by the
25 cleaning device 100 and to draft the sliver S. The cleaning device 100
may, however, be provided on a drafting device that drafts the sliver and
33
the like spun by a spinning device other than the air spinning device 7.
[0089] In the spinning unit 2, in the direction of machine height, the
various devices have been arranged such that the yarn Y supplied on the
upper side is taken up on the lower side. However, the various devices
5 may be arranged such that the yarn Y supplied on the lower side is taken
up on the upper side. In FIG. 1, the spinning machine 1 is illustrated so
as to take up the package P of a cheese shape. However, it is possible
to take up the package P of a cone shape.
[0090] In the spinning unit 2, the yarn storage device 11 has the
10 function of extruding the yarn Y from the air spinning device 7.
However, the yarn Y may be extruded from the air spinning device 7 by
a delivery roller and a nip roller. When the yarn Y is extruded from the
air spinning device 7 by the delivery roller and the nip roller, in place of
the yarn storage device 11, a slack tube absorbing the slack of the yarn
15 Y by a suction airflow, or a mechanical compensator and the like may
be provided.
[0091] In the traveling direction of the yarn Y, the tension sensor 9 may
be provided on the upstream side of the yarn monitor 8. The unit
controller 10 may be provided to each of the spinning units 2. In the
20 spinning unit 2, the waxing device 12, the tension sensor 9, and the yarn
monitor 8 may be omitted.
[0092] At least a part of the above-described embodiment and
modifications may be combined in any desired manner.
[0093] In the cleaning device for a drafting roller according to one form
25 of the present disclosure, because the angle being formed by the
tangent-line upstream portion and the upstream-side outer surface is an
34
obtuse angle, the scraper edge portion is in a state of scraping off the
fibers adhering on the outer circumferential surface of the drafting
roller. Thus, the scraper edge portion is restrained from escaping
toward a downstream side in the rotational direction of the drafting
5 roller, and it is possible to remove the fibers adhering on the outer
circumferential surface of the drafting roller more reliably.
[0094] In one form of the disclosure, the angle being formed by the
tangent-line upstream portion and the upstream-side outer surface may
be greater than 90° but less than or equal to 135° when viewed along the
10 axial direction of the drafting roller. For example, when the angle
being formed by the tangent-line upstream portion and the
upstream-side outer surface is increased, there is a need to make the
scraper edge portion thin. Thus, when the angle being formed by the
tangent-line upstream portion and the upstream-side outer surface is
15 made to be greater than 90° but less than or equal to 135°, it is possible
to remove the fibers adhering on the outer circumferential surface of the
drafting roller more reliably while ensuring the thickness of the scraper
edge portion and keeping the strength thereof.
[0095] In one form of the disclosure, the scraper may further include a
20 scraper main-unit portion on which the scraper edge portion is provided
and facing the outer circumferential surface of the drafting roller, and a
projecting portion provided on a surface facing the drafting roller in the
scraper main-unit portion. When the projecting portion is provided on
the scraper main-unit portion, because the scraper edge portion and the
25 projecting portion come into contact with the outer circumferential
surface of the drafting roller, it is possible to restrain the scraper
35
main-unit portion from wearing out. Accordingly, it is suppressed that
the scraper main-unit portion wears out and the scraper deforms greatly,
for example, and it is possible to prolong the usable period of the
scraper.
5 [0096] In one form of the disclosure, the cleaning device may further
include a pressing unit configured to press the scraper main-unit portion
toward the outer circumferential surface of the drafting roller, and the
projecting portion may be provided in a region sandwiched between a
pressing area, in which the pressing unit presses the scraper main-unit
10 portion, and the outer circumferential surface of the drafting roller. In
the region pressed by the pressing unit, abrasion is likely to be
promoted. However, because the projecting portion is provided in the
region sandwiched between the pressing area and the outer
circumferential surface of the drafting roller, it is possible to further
15 restrain the scraper main-unit portion from wearing out.
[0097] In one form of the disclosure, the scraper main-unit portion may
be provided with a stopper portion projecting toward the outer
circumferential surface of the drafting roller, on at least either one of
end portions thereof in the width direction of the drafting roller, and a
20 distance between a distal end portion of the stopper portion and the
outer circumferential surface of the drafting roller may be narrower than
a distance between a surface pressed by the pressing unit in the scraper
main-unit portion and the outer circumferential surface of the drafting
roller. In this case, when the scraper edge portion and the like wear out
25 and a whole of the scraper comes close to the outer circumferential
surface side of the drafting roller, the distal end of the stopper portion
36
comes into contact with the outer circumferential surface of the drafting
roller. Because the stopper portion is provided on the end portion of
the scraper main-unit portion, an operator can visually recognize the
stopper portion easily. Thus, the operator can understand, by visually
5 recognizing the distance between the distal end portion of the stopper
portion and the outer circumferential surface of the drafting roller, a
state of abrasion of the scraper easily. Accordingly, the operator can
easily understand the time to replace the scraper. Furthermore, the
distance between the distal end portion of the stopper portion and the
10 outer circumferential surface of the drafting roller is narrower than the
distance between the surface pressed by the pressing unit in the scraper
main-unit portion and the outer circumferential surface of the drafting
roller. Thus, at the time the distal end portion of the stopper portion
first comes into contact with the outer circumferential surface of the
15 drafting roller, there is some thickness remaining to the scraper
main-unit portion. That is, the operator can understand, by checking
whether the stopper portion has come into contact with the outer
circumferential surface of the drafting roller, the time to replace the
scraper, before the scraper main-unit portion wears out and has holes
20 and the like.
[0098] In one form of the disclosure, the drafting roller may be
provided with, on the outer circumferential surface thereof, a drafting
surface on which a plurality of grooves extending in a direction
intersecting with the rotational direction are provided and a smooth
25 surface having a surface smoother than the drafting surface; the drafting
surface and the smooth surface may be provided at locations different
37
from each other in the width direction of the drafting roller and be
extending over an entire area in a circumferential direction of the outer
circumferential surface of the drafting roller; the scraper edge portion
may come into contact with the drafting surface; and the stopper portion
may be projecting toward the smooth surface. As just described,
because the stopper portion comes into contact with the smooth surface,
the abrasion of the stopper portion is reduced as compared with when
the stopper portion comes into contact with the drafting surface.
Furthermore, because the stopper portion comes into contact with the
smooth surface, the scraper is restrained from further nearing the
drafting surface. Accordingly, the scraper main-unit portion is
restrained from wearing out and having holes and the like, and the
pressing unit is restrained from being brought into contact directly with
the drafting surface.
[0099] In one form of the disclosure, the projecting portion may be
provided at a location avoiding, in the width direction of the drafting
roller, an area in which a sliver that wound around the outer
circumferential surface of the drafting roller passes. In this case,
because the fibers adhering on the outer circumferential surface of the
drafting roller are never to be pressed by the projecting portion, it is
possible to prevent the projecting portion from interfering with the
removal of fibers by the scraper edge portion.
[0100] In one form of the disclosure, the cleaning device may further
include a pressing unit configured to press the scraper toward the outer
circumferential surface of the drafting roller, and the pressing unit may
press the scraper such that one end portion in the width direction of the
drafting roller in the scraper and the other end portion thereof are
pressed with different force. For example, by the orientation of the
grooves provided on the outer circumferential surface of the drafting
roller, and by the variance and others in the manufacturing accuracy of
various portions, the bias in abrasion of the scraper may occur. Even
when such bias in abrasion occurs, by providing the pressing unit in the
above-described configuration, it is possible to suppress the bias in
abrasion of the scraper and prolong the usable period of the scraper.
[0101] In one form of the disclosure, the drafting roller may be, out of a
top roller and a bottom roller vertically arranged in juxtaposition, the
bottom roller, and the scraper edge portion may come into contact with
the outer circumferential surface of the drafting roller at a location on a
lower side than a horizontal line that passes an axis of the drafting roller
when viewed along the axial direction of the drafting roller. In this
case, it is possible to efficiently drop the fibers that are removed from
the drafting roller, to the outside (lower side) of the scraper. When the
angle by the tangent-line upstream portion and the upstream-side outer
surface is made to be an obtuse angle, the scraper edge portion and
others are to be located on the more downstream side in the rotational
direction of the drafting roller than a region at which the scraper edge
portion comes into contact with the outer circumferential surface of the
drafting roller. Thus, by bringing the scraper edge portion into contact
with the outer circumferential surface of the drafting roller at the
above-described location, while ensuring the placement space of the
members such as the scraper, without interfering with the placement of
the top roller and others, the scraper edge portion can be brought into
contact with the outer circumferential surface of the drafting roller such
that the tangent-line upstream portion and the upstream-side outer
surface form an obtuse angle.
[0102] In one form of the disclosure, the scraper may be provided with
a positioning claw portion configured to come into contact with the
outer circumferential surface of the drafting roller and to make
positioning of the scraper, at an end portion on the downstream side in
the rotational direction of the drafting roller, and the positioning claw
portion may be provided at a location avoiding, in the width direction of
the drafting roller, the area in which the sliver that wound around the
outer circumferential surface of the drafting roller passes. In this case,
because the fibers adhering on the outer circumferential surface of the
drafting roller are never to be pressed by the positioning claw portion, it
is possible to prevent the positioning claw portion from interfering with
the removal of fibers by the scraper edge portion.
[0103] The cleaning device for a drafting roller according to one form
of the present disclosure is a cleaning device for a drafting roller
including a scraper extending along the width direction of the drafting
roller and configured to come into contact with an outer circumferential
surface of the drafting roller; and includes a pressing unit configured to
press the scraper toward the outer circumferential surface of the drafting
roller; the scraper includes a scraper main-unit portion on which a
scraper edge portion and a stopper portion are provided and facing the
outer circumferential surface of the drafting roller; the scraper main-unit
portion is pressed toward the outer circumferential surface of the
drafting roller by the pressing unit; the scraper edge portion comes into
contact with the outer circumferential surface of the drafting roller; the
stopper portion is provided on at least either one of end portions in the
width direction of the drafting roller in the scraper edge portion and is
projecting toward the outer circumferential surface of the drafting roller;
and the distance between the distal end portion of the stopper portion
and the outer circumferential surface of the drafting roller is narrower
than the distance between the surface pressed by the pressing unit in the
scraper main-unit portion and the outer circumferential surface of the
drafting roller.
In this case, in the scraper, when the scraper edge portion and
the like wear out and a whole of the scraper comes close to the outer
circumferential surface side of the drafting roller, the distal end of the
stopper portion comes into contact with the outer circumferential
surface of the drafting roller. Because the stopper portion is provided
on both end portions of the scraper main-unit portion, the operator can
visually recognize the stopper portion easily. Thus, the operator can
understand, by visually recognizing the distance between the distal end
portion of the stopper portion and the outer circumferential surface of
the drafting roller, a state of abrasion of the scraper easily.
Accordingly, the operator can easily understand the time to replace the
scraper. The distance between the distal end portion of the stopper
portion and the outer circumferential surface of the drafting roller is
narrower than the distance between the surface pressed by the pressing
unit in the scraper main-unit portion and the outer circumferential
surface of the drafting roller. Thus, at the time the distal end portion of
the stopper portion first comes into contact with the outer
circumferential surface of the drafting roller, there is some thickness
remaining to the scraper main-unit portion. That is, the operator can
understand, by checking whether the stopper portion has come into
contact with the outer circumferential surface of the drafting roller, the
time to replace the scraper, before the scraper main-unit portion wears
out and has holes and the like.
[0104] The cleaning device for a drafting roller according to one form
of the present disclosure is a cleaning device for a drafting roller,
including a scraper extending along the width direction of the drafting
roller and configured to come into contact with an outer circumferential
surface of the drafting roller; and a pressing unit configured to press the
scraper toward the outer circumferential surface of the drafting roller.
The drafting roller is provided with, on the outer circumferential surface
thereof, a drafting surface on which a plurality of grooves extending in a
direction intersecting with the rotational direction are provided and a
smooth surface having a surface smoother than the drafting surface.
The drafting surface and the smooth surface are provided at locations
different from each other in the width direction of the drafting roller and
are extending over the entire area in the circumferential direction of the
outer circumferential surface of the drafting roller. The scraper
includes a scraper main-unit portion on which a scraper edge portion
and a stopper portion are provided and facing the outer circumferential
surface of the drafting roller. The scraper main-unit portion is pressed
toward the outer circumferential surface of the drafting roller by the
pressing unit. The scraper edge portion comes into contact with the
drafting surface of the drafting roller. The stopper portion is projecting
toward the outer circumferential surface of the drafting roller. The
distance between the distal end portion of the stopper and the smooth
surface of the drafting roller is narrower than the distance between the
surface pressed by the pressing unit in the scraper main-unit portion and
the drafting surface of the drafting roller.
In this case, when the scraper edge portion and the like wear out
and a whole of the scraper comes close to the outer circumferential
surface side of the drafting roller, the distal end of the stopper portion
comes into contact with the smooth surface of the drafting roller. The
operator can understand, by visually recognizing the distance between
the distal end portion of the stopper portion and the outer
circumferential surface of the drafting roller, a state of abrasion of the
scraper. Accordingly, the operator can easily understand the time to
replace the scraper. Furthermore, the distance between the distal end
portion of the stopper portion and the outer circumferential surface of
the drafting roller is narrower than the distance between the surface
pressed by the pressing unit in the scraper main-unit portion and the
outer circumferential surface of the drafting roller. Thus, at the time
the distal end portion of the stopper portion first comes into contact with
the outer circumferential surface of the drafting roller, there is some
thickness remaining to the scraper main-unit portion. That is, the
operator can understand, by checking whether the stopper portion has
come into contact with the outer circumferential surface of the drafting
roller, the time to replace the scraper, before the scraper main-unit
portion wears out and has holes and the like. The stopper portion is
extending toward the smooth surface of the drafting roller. When the
scraper edge portion and the like wear out, the stopper portion comes
into contact with the smooth surface. Thus, the abrasion of the stopper
portion is reduced as compared with when the stopper portion comes
into contact with the drafting surface having the grooves.
Furthermore, because the stopper portion comes into contact with the
smooth surface, the scraper is restrained from further nearing the
drafting surface. Accordingly, the scraper main-unit portion is
restrained from wearing out and having holes and the like, and the
pressing unit is restrained from being brought into contact directly with
the drafting surface.

We claim:
1. A cleaning device (100) for a drafting roller (14a, 14b, 15a, 15b,
17a, 17b) comprising:
a scraper (150, 150A, 150B) extending along a width direction
of the drafting roller (14a, 14b, 15a, 15b, 17a, 17b) and configured to
come into contact with an outer circumferential surface of the drafting
roller (14a, 14b, 15a, 15b, 17a, 17b), wherein
the scraper (150; 150A; 150B) is provided with, at an end
portion on an upstream side in a rotational direction of the drafting
roller (14a, 14b, 15a, 15b, 17a, 17b), a scraper edge portion (152)
configured to come into contact with the outer circumferential surface
of the drafting roller (14a, 14b, 15a, 15b, 17a, 17b), and
an angle (a) being formed by a tangent-line upstream portion
(L) that is on a tangent line of the drafting roller (14a, 14b, 15a, 15b,
17a, 17b) passing a contact point (T) with the scraper edge portion (152)
and extends from the contact point (T) toward the upstream side of the
rotational direction of the drafting roller (14a, 14b, 15a, 15b, 17a, 17b),
and by an upstream-side outer surface (152a) that is in an outer surface
of the scraper edge portion and is a surface facing the upstream side in
the rotational direction of the drafting roller (14a, 14b, 15a, 15b, 17a,
17b), is an obtuse angle when viewed along an axial direction of the
drafting roller (14a, 14b, 15a, 15b, 17a, 17b).
2. The cleaning device (100) for a drafting roller (14a, 14b, 15a,
15b, 17a, 17b) according to claim 1, wherein the angle (a) formed by
the tangent-line upstream portion (L) and the upstream-side outer
surface (152) is greater than 90° but less than or equal to 135° when
viewed along the axial direction of the drafting roller (14a, 14b, 15a,
15b, 17a, 17b).
3. The cleaning device (100) for a drafting roller (14a, 14b, 15a,
15b, 17a, 17b) according to claim 1 or 2, wherein the scraper (150;
150A; 150B) further comprises:
a scraper main-unit portion (151) provided with the scraper edge
portion (152) and facing the outer circumferential surface of the drafting
roller (14a, 14b, 15a, 15b, 17a, 17b); and
a projecting portion (155; 155A; 155B) provided on a surface
facing the drafting roller (14a, 14b, 15a, 15b, 17a, 17b) in the scraper
main-unit portion (151).
4. The cleaning device (100) for a drafting roller (14a, 14b, 15a,
15b, 17a, 17b) according to claim 3, further comprising a pressing unit
(140) configured to press the scraper main-unit portion (151) toward the
outer circumferential surface of the drafting roller (14a, 14b, 15a, 15b,
17a, 17b), wherein
the projecting portion (155; 155A; 155B) is provided in a region
sandwiched between a pressing area (Q) in which the pressing unit
(140) presses the scraper main-unit portion (151), and the outer
circumferential surface of the drafting roller (14a, 14b, 15a, 15b, 17a,
17b).
5. The cleaning device (100) for a drafting roller (14a, 14b, 15a,
15b, 17a, 17b) according to claim 4, wherein
the scraper main-unit portion (151) is provided with a stopper
portion (160) projecting toward the outer circumferential surface of the
drafting roller (14a, 14b, 15a, 15b, 17a, 17b) on at least either one of
end portions thereof in the width direction of the drafting roller (14a,
14b, 15a, 15b, 17a, 17b), and
a distance (Kl) between a distal end portion of the stopper
portion (160) and the outer circumferential surface of the drafting roller
(14a, 14b, 15a, 15b, 17a, 17b) is narrower than a distance (K2) between
a surface (151b) pressed by the pressing unit (140) in the scraper
main-unit portion (151) and the outer circumferential surface of the
drafting roller (14a, 14b, 15a, 15b, 17a, 17b).
6. The cleaning device (100) for a drafting roller (14a, 14b, 15a,
15b, 17a, 17b) according to claim 5, wherein
the drafting roller (14a, 14b, 15a, 15b, 17a, 17b) is provided
with, on the outer circumferential surface thereof, a drafting surface
(HI) on which a plurality of grooves (m) extending in a direction
intersecting with the rotational direction are provided and a smooth
surface (H2) having a surface smoother than the drafting surface (HI),
the drafting surface (HI) and the smooth surface (H2) are
provided at locations different from each other in the width direction of
the drafting roller (14a, 14b, 15a, 15b, 17a, 17b) and are extending over
an entire area in a circumferential direction of the outer circumferential
surface of the drafting roller (14a, 14b, 15a, 15b, 17a, 17b),
the scraper edge portion (152) comes into contact with the
drafting surface (HI), and
the stopper portion (160) is projecting toward the smooth
surface (H2).
7. The cleaning device (100) for a drafting roller (14a, 14b, 15a,
15b, 17a, 17b) according to any one of claims 3 to 6, wherein the
projecting portion (155; 155A; 155B) is provided at a location avoiding,
in the width direction of the drafting roller (14a, 14b, 15a, 15b, 17a,
17b), an area in which a sliver (S) that wound around the outer
circumferential surface of the drafting roller (14a, 14b, 15a, 15b, 17a,
17b) passes.
8. The cleaning device (100) for a drafting roller (14a, 14b, 15a,
15b, 17a, 17b) according to any one of claims 1 to 7, further comprising
a pressing unit (140) configured to press the scraper (150; 150A; 150B)
toward the outer circumferential surface of the drafting roller (14a, 14b,
15a, 15b, 17a, 17b), wherein
the pressing unit (140) presses the scraper (150; 150A; 150B)
such that one end portion in the width direction of the drafting roller
(14a, 14b, 15a, 15b, 17a, 17b) in the scraper (150; 150A; 150B) and the
other end portion thereof are pressed with different force.
9. The cleaning device (100) for a drafting roller (14a, 14b, 15a,
15b, 17a, 17b) according to any one of claims 1 to 8, wherein
the drafting roller (14a, 14b, 15a, 15b, 17a, 17b) is, out of atop
roller (14b, 15b, 17b) and a bottom roller (14a, 15a, 17a) vertically
arranged in juxtaposition, the bottom roller (14a, 15a, 17a), and
the scraper edge portion (152) comes into contact with the outer
circumferential surface of the drafting roller (14a, 14b, 15a, 15b, 17a,
17b) at a location lower than a horizontal line that passes an axis of the
drafting roller (14a, 14b, 15a, 15b, 17a, 17b) when viewed along the
axial direction of the drafting roller (14a, 14b, 15a, 15b, 17a, 17b).
10. The cleaning device (100) for a drafting roller (14a, 14b, 15a,
15b, 17a, 17b) according to any one of claims 1 to 9, wherein
the scraper (150; 150A; 150B) is provided with a positioning
claw portion (153) configured to come into contact with the outer
circumferential surface of the drafting roller (14a, 14b, 15a, 15b, 17a,
17b) and to make positioning of the scraper (150; 150A; 150B), at an
end portion on a downstream side in the rotational direction of the
drafting roller (14a, 14b, 15a, 15b, 17a, 17b), and
the positioning claw portion (153) is provided at a location
avoiding, in the width direction of the drafting roller (14a, 14b, 15a,
15b, 17a, 17b), an area in which a sliver (S) that wound around the outer
circumferential surface of the drafting roller (14a, 14b, 15a, 15b, 17a,
17b) passes.