BELT GUIDE ROLLER, CLEANING DEVICE, DRAFT DEVICE, AND
SPINNING MACHINE
BACKGROUND OF THE INVENTION
5 1. Field of the Invention
The present invention mainly relates to a belt
roller adapted to guide a cleaning belt for cleaning a
roller.
10 2. Description of the Related Art
Conventionally, in a spinning machine, a structure
including a draft device adapted to draft a fiber bundle
(sliver) is known. The draft device includes a plurality
of draft roller pairs each including two rollers facing each
15 other, and the draft device is adapted to draft the fiber
bundle by rotating the draft roller pairs at different
speeds.
When drafting the fiber bundle with the draft device,
fibers of a part of the fiber bundle may scatter and attach
20 to an outer peripheral surface of the draft roller as fluffs.
If a large amount of fluffs attach to the outer peripheral
surface of the draft roller, quality of a yarn produced in
a downstream spinning device may degrade, or yarn breakage
or the like may occur. Therefore, in order to avoid such
25 problems, a configuration for cleaning the outer peripheral
surface of the draft roller in the draft device has been
conventionally proposed.
Japanese Unexamined Patent Publication No.
2006-83475 discloses a belt type cleaning device. The
30 cleaning device includes an endless belt (cleaning belt)
and an intermittent feeding means. The endless belt makes
2
contact with the surface of the draft roller and cleans the
surface of the draft roller. The intermittent feeding
means includes a plurality of rotation shafts (belt guide
rollers) adapted to guide (drive) the endless belt.
5 It is not realistic to remove all the fluffs generated
at the time of drafting and at the time of cleaning.
Therefore, the fluffs cannot be prevented from being wound
around the belt guide roller of the cleaning device.
Japanese Unexamined Patent Publication No. 2006-83475 does
10 not disclose a detailed configuration of the belt guide
roller.
If the fluffs are wound around the belt guide roller
and the fluffs enter the inside of the belt guide roller,
resistance is generated between a roller main body and a
15 roller shaft of the belt guide roller, and a rotation
failure of the belt guide roller may be caused. As a result,
the cleaning belt stops, and the surface of the cleaning
belt wears.
20 BRIEF SUMMARY OF THE INVENTION
It is a main object of the present invention to provide
a belt guide roller that can prevent a rotation failure from
occurring even if fluffs are wound around the belt guide
roller.
25 According to a first aspect of the present invention,
a belt guide roller includes a roller main body, a roller
shaft of the roller main body, and a shaft attachment
section. The roller main body makes contact with a cleaning
belt for cleaning the draft roller to guide the cleaning
30 belt. The shaft attachment section is attached to cover
at least a part of the outer surface of the roller shaft.
3
One of the roller main body and the shaft attachment section
is provided with a recessed portion recessed in an axial
direction of the roller shaft, and the other of the roller
main body or the shaft attachment section is formed to enter
5 the recessed portion.
According to a second aspect of the present invention,
there is provided a cleaning device including the belt guide
roller described above, and a cleaning belt guided by the
belt guide roller.
10 According to a third aspect of the present invention,
there is provided a draft device including the cleaning
device and a plurality of draft roller pairs. Each of the
plurality of draft roller pairs is configured by a top
roller and a bottom roller. The cleaning belt is arranged
15 to make contact with the plurality of top rollers. In the
draft device, the top roller located second from downstream
in a draft direction includes a feeding cam section, the
feeding cam section intermittently driving the belt guide
roller.
20 According to a fourth aspect of the present invention,
there is provided a spinning machine including the draft
device, a pneumatic spinning device, and a winding device.
The pneumatic spinning device is adapted to twist a fiber
bundle drafted by the draft device using an airflow to
25 produce a spun yarn. The winding device is adapted to wind
the spun yarn supplied from the pneumatic spinning device
into a package.
BRIEF DESCRIPTION OF THE DRAWINGS
30 FIG. 1 is a front view illustrating an overall
structure of a spinning machine according to one embodiment
4
of the present invention;
FIG. 2 is a side view of a spinning unit;
FIG. 3 is a perspective view of a cleaning device;
FIG. 4A is an exploded perspective view of a first
5 roller;
FIG. 4B is a perspective view illustrating a shape
of a first shaft end side of a roller main body;
FIG. 5 is a cross-sectional view of the first roller;
FIG. 6A is a schematic perspective view illustrating
10 a state in which the first roller is supported;
FIG. 6B is a schematic cross-sectional view
illustrating a shape of a supporting section contacting
portion; and
FIG. 7 is a cross-sectional view of a conventional
15 belt guide roller.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
A spinning machine according to one embodiment of the
present invention will be described below with reference
20 to the drawings. A spinning machine 1 illustrated in FIG.
1 includes a plurality of spinning units 2 arranged in line,
a yarn joining cart 3, a motor box 4, a blower box 95, and
a machine control device 90.
The machine control device 90 collectively manages
25 each component of the spinning machine 1, and includes a
monitor 91 and an input key 92. When an operator carries
out an appropriate operation using the input key 92,
settings and/or states and the like of a specific spinning
unit 2 or all the spinning units 2 are displayed on the
30 monitor 91.
As illustrated in FIG. 2, each spinning unit 2
5
includes a draft device 7, a pneumatic spinning device 9,
a yarn storage device 14, and a winding device 70 arranged
in this order from upstream to downstream. "Upstream" and
"downstream" respectively refer to upstream and downstream
5 in a travelling (transporting) direction of a sliver 6, a
fiber bundle 8, and a spun yarn 10 at the time of spinning.
Each spinning unit 2 is adapted to spin the fiber bundle
8 fed from the draft device 7 by the pneumatic spinning
device 9 to produce the spun yarn 10, and the spun yarn 10
10 is wound by the winding device 70 into a package 45.
The draft device 7 is arranged in proximity to an upper
end of a housing 5 of the spinning machine 1. The draft
device 7 drafts the sliver 6 (stretch the fiber bundle)
supplied from a sliver case (not illustrated) through a
15 sliver guide 20 to a predetermined thickness. The fiber
bundle 8 drafted by the draft device 7 is supplied to the
pneumatic spinning device 9. The details of the draft
device 7 will be described later.
The pneumatic spinning device 9 applies a twist to
20 the fiber bundle 8 supplied from the draft device 7 to
produce the spun yarn 10. In the present embodiment, a
pneumatic type spinning device adapted to apply a twist to
the fiber bundle 8 using a whirling airflow is adopted.
Specifically, although the detailed description and the
25 illustration will be omitted, the pneumatic spinning device
9 includes a fiber guiding section, a whirling airflow
generating nozzle, and a hollow guide shaft body. The fiber
guiding section guides the fiber bundle 8 fed from the draft
device 7 to a spinning chamber formed inside the pneumatic
30 spinning device 9. The whirling airflow generating nozzle
is arranged around a path of the fiber bundle 8, and
6
generates a whirling airflow in the spinning chamber. This
whirling airflow causes a fiber end of the fiber bundle 8
in the spinning chamber to be reversed and to whirl. The
hollow guide shaft body guides the spun yarn 10 from the
5 spinning chamber to an outside of the pneumatic spinning
device 9.
A yarn quality measuring device 12 and a spinning
sensor 13 are arranged downstream of the pneumatic spinning
device 9. The spun yarn 10 spun by the pneumatic spinning
10 device 9 is passed through the yarn quality measuring device
12 and the spinning sensor 13.
The yarn quality measuring device 12 monitors a
thickness of the travelling spun yarn 10 with an optical
sensor (not illustrated) . When a yarn defect (area where
15 abnormality is found in thickness or the like of the spun
yarn 10) of the spun yarn 10 is detected, the yarn quality
measuring device 12 transmits a yarn defect detection
signal to a unit controller (not illustrated). The yarn
quality measuring device 12 is not limited to the optical
20 sensor and may have a configuration in which the thickness
of the spun yarn 10 is monitored with a capacitance sensor.
The yarn quality measuring device 12 may detect a foreign
substance contained in the spun yarn 10 as a yarn defect.
The spinning sensor 13 is arranged immediately
25 downstream of the yarn quality measuring device 12. The
spinning sensor 13 can detect tension of the spun yarn 10
between the pneumatic spinning device 9 and the yarn storage
device 14. The spinning sensor 13 transmits the detected
tension to the unit controller. The unit controller
30 detects an abnormal area such as a weak yarn or the like
by monitoring the tension detected by the spinning sensor
7
13.
The yarn storage device 14 is arranged downstream of
the yarn quality measuring device 12 and the spinning sensor
13. As illustrated in FIG. 2, the yarn storage device 14
5 includes a yarn storage roller 15, and a motor 16 for
rotatably driving the yarn storage roller 15.
The yarn storage roller 15 can have a prescribed
amount of the spun yarn 10 wound around an outer peripheral
surface thereof to temporarily store the spun yarn 10. When
10 the yarn storage roller 15 is rotated at a predetermined
rotation speed with the spun yarn 10 wound around the outer
peripheral surface of the yarn storage roller 15, the spun
yarn 10 can be pulled out at a predetermined speed from the
pneumatic spinning device 9 and transported towards the
15 downstream. Since the spun yarn 10 is temporarily stored
on the outer peripheral surface of the yarn storage roller
15, the yarn storage device 14 can function as one type of
buffer. Accordingly, a drawback (e.g., slackening of the
spun yarn 10 or the like) when a spinning speed in the
20 pneumatic spinning device 9 and a winding speed (speed of
the spun yarn 10 wound into the package 45) do not match
for some reason can be resolved.
A yarn guide 17 and the winding device 70 are arranged
downstream of the yarn storage device 14. The winding
25 device 70 includes a cradle arm 71 supported to be swingable
about a supporting shaft 73. The cradle arm 71 can
rotatably support a bobbin 48 for winding the spun yarn 10.
The winding device 70 includes a winding drum
(contact roller) 72 and a traverse device 75. The winding
30 device 70 includes a winding drum drive motor (not
illustrated) . When a drive force of the winding drum drive
8
motor is transmitted, the winding drum 72 rotates while
making contact with the outer peripheral surface of the
bobbin 48 or the package 45. The traverse device 75
includes a traverse guide 76 that can be engaged with the
5 spun yarn 10. The winding device 70 drives the winding drum
72 with the winding drum drive motor while reciprocating
the traverse guide 76 with a driving means (not illustrated) .
The winding device 70 thereby rotates the package 45 making
contact with the winding drum 72, and winds the spun yarn
10 10 into the package 45 while traversing the spun yarn 10.
As illustrated in FIGS. 1 and 2, the yarn joining cart
3 includes a yarn joining device 43, a suction pipe 44, and
a suction mouth 46. When yarn breakage or yarn cut occurs
in a spinning unit 2, the yarn joining cart 3 travels on
15 a rail 41 to the relevant spinning unit 2 and stops. The
suction pipe 44 sucks and catches the spun yarn 10 fed from
the pneumatic spinning device 9 while being swung
vertically with a shaft as a center, and guides the spun
yarn 10 to the yarn joining device 43. The suction mouth
20 46 sucks and catches the spun yarn 10 from the package 45
while being swung vertically with a shaft as a center, and
guides the spun yarn 10 to the yarn joining device 43. The
yarn joining device 43 carries out a yarn joining operation
on yarn ends of the guided spun yarn 10.
25 Next, with reference to FIG. 2, the draft device 7
will be described in detail. First, the draft roller
arranged in the draft device 7 will be described.
As illustrated in FIG. 2, the draft device 7 includes
a tubular sliver guide 20 adapted to introduce the sliver
30 6, and also includes a plurality of draft roller pairs
including a bottom roller and a top roller facing each other.
9
The bottom roller is located on a rear surface side (lower
side) of the spinning machine 1, and the top roller is
located on a front surface side (upper side) of the spinning
machine 1. The draft device 7 of the present embodiment
5 is configured as a so-called four line draft device
including a back roller pair, a third roller pair, a middle
roller pair, and a front roller pair arranged in this order
from the upstream.
Specifically, the plurality of top rollers are, in
10 the order from the upstream, a back top roller 21, a third
top roller 22, a middle top roller 24 provided with an apron
belt 23, and a front top roller 25. The plurality of bottom
rollers are, in the order from the upstream, a back bottom
roller 26, a third bottom roller 27, a middle bottom roller
15 28 provided with the apron belt 23, and a front bottom roller
29.
Each of the top rollers 21, 22, 24, and 25 is a roller
in which an outer peripheral surface is made of an elastic
member such as rubber. Each of the top rollers 21, 22, 24,
20 and 25 is rotatably supported through a bearing (not
illustrated) and the like with an axis line thereof as a
center. Each of the bottom rollers 26, 27, 28, and 29 is
a metal roller, and is rotatably driven with an axis line
thereof as the center.
25 The draft device 7 includes an urging means (not
illustrated) adapted to urge each of the top rollers 21,
22, 24, and 25 towards the opposing bottom rollers 26, 27,
28, and 29, respectively. The outer peripheral surfaces
of the top rollers 21, 22, 24, and 25 thus elastically make
30 contact with the outer peripheral surfaces of the bottom
rollers 26, 27, 28, and 29, respectively. When the bottom
10
rollers 26, 27, 28, and 29 are rotatably driven in such a
configuration, the top rollers 21, 22, 24, and 25 opposing
and contacting thereto also rotate accompanying the
rotation of the bottom rollers 26, 27, 28, and 29. The draft
5 device 7 includes a draft cradle (not illustrated) adapted
to rotatably support each of the top rollers 21, 22, 24,
and 25.
The draft device 7 nips (sandwiches) the fiber bundle
8 between the rotating top rollers 21, 22, 24, and 25 and
10 the bottom rollers 26, 27, 28, and 29, and transports the
fiber bundle 8 towards the. downstream. The draft device
7 is structured such that the rotation speed becomes faster
towards the draft roller pair on the downstream. Therefore,
the fiber bundle 8 is stretched (drafted) while being
15 transported between the draft roller pair and the draft
roller pair, and accompanying therewith, a thickness of the
fiber bundle 8 becomes narrower towards the downstream.
A degree to which the fiber bundle 8 is drafted can
be changed by appropriately setting the rotation speed of
20 each of the bottom rollers 26, 27, 28, and 29. Therefore,
the fiber bundle 8 drafted to the desired thickness can be
supplied to the pneumatic spinning device 9. Accordingly,
the spun yarn 10 of a desired yarn count (thickness) can
be spun by the pneumatic spinning device 9.
25 Next, a cleaning device 60 will be described with
reference to FIG. 3. The cleaning device 60 adapted to
clean the draft roller is arranged above the draft device
7. The cleaning device 60 includes a frame 61, which is
fixed to a side surface of the draft cradle (not
30 illustrated).
The frame 61 rotatably supports a first roller 67 and
11
a second roller 68 serving as the belt guide roller. An
urging lever 62 is swingably attached to the frame 61. A
tension roller 69 is rotatably supported at a distal end
of the urging lever 62.
5 An endless cleaning belt (endless belt) 74 is wound
around the first roller 67, the second roller 68, and the
tension roller 69. As illustrated in FIG. 3, the cleaning
belt 74 is arranged so that the outer peripheral surface
(cleaning surface) makes contact with the outer peripheral
10 surfaces of the top rollers 21 and 22, and the top side apron
belt 23. An urging spring (not illustrated) is attached
to the urging lever 62 . The urging spring urges the urging
lever 62 in a direction of applying tension to the cleaning
belt 74.
15 In the configuration described above, the top rollers
21, 22 and the apron belt 23 are rotated with the outer
peripheral surfaces thereof making contact with the
cleaning belt 74. Thus, matters attached to the outer
peripheral surfaces of the top rollers 21, 22 and the apron
20 belt 23 can be cleaned by the cleaning belt 74.
The first roller 67 is arranged in proximity to the
middle top roller 24. A gear portion 35b having a few gear
teeth is fixed to the first roller 67. A boss section 64
is arranged in a projecting manner at one end in an axial
25 direction of the middle top roller 24, and a rotation
projection (feeding cam section, rotation engagement
section) 65 is projected out from the boss section 64. The
rotation projection 65 is formed to be directed in a radial
direction. The distal end of the rotation projection 65
30 is capable of being engaged with the gear portion 35b.
The rotation projection 65 rotates with the middle
12
top roller 24 and engages the gear portion 35b for every
one rotation to rotate the gear portion 35b by one tooth
at a time. The first roller 67 is thereby rotated, and the
cleaning belt 74 is fed by an appropriate amount.
5 As a result, a fresh cleaning surface of the cleaning
belt 74 makes contact with the top rollers 21, 22 and the
apron belt 23 each time the middle top roller 24 makes one
rotation, whereby the cleaning effect of the cleaning belt
74 can be enhanced. Furthermore, according to such
10 intermittent feeding, the drive of the cleaning belt 74 is
stopped when not necessary, so that a large relative speed
difference can be given with respect to the respective outer
peripheral surfaces of the top rollers 21, 22 and the apron
belt 23 to be cleaned. As a result, a more satisfactory
15 cleaning effect is obtained.
Next, the first roller 67 and the second roller 68
adapted to guide the cleaning belt 74 will be described with
reference to FIGS. 4A to 7. The second roller 68 has a
structure substantially similar to the first roller 67
20 except that the gear portion 35b is not arranged, and thus
the first roller 67 will be representatively described
below. As illustrated in FIG. 4A, the first roller 67
includes a roller main body 30, a roller shaft 50, two shaft
attachment sections 81, two E-rings (fall-out preventing
25 section) 83, and two cover sections 85. The shaft
attachment sections 81, the E-rings 83, and the cover
sections 85 have substantially the same shape and have
similar functions, and thus will be collectively described.
The roller main body 30 is a member adapted to make
30 contact with the cleaning belt 74 to drive (guide) the
cleaning belt 74. The roller main body 30 is configured
13
by a belt contacting portion 32, a central base portion 33,
a first end base portion 34, and a second end base portion
35. The central base portion 33, the first end base portion
34, and the second end base portion 35 are made of resin
5 and are integrated.
The central base portion 33 is a portion located at
a center in a longitudinal direction (axial direction).
The central base portion 33 is a cylindrical member, and
the belt contacting portion 32 is attached to the outer side
10 thereof.
The belt contacting portion 32 is a cylindrical
member made of rubber, and is a portion that makes contact
with the cleaning belt 74. A plurality of cuboid-shaped
projections are arranged on the surface of the belt
15 contacting portion 32 to prevent slipping of the cleaning
belt 74. The projections may not be provided, so that the
fluffs can be more reliably prevented from attaching to the
belt contacting portion 32.
The first end base portion 34 is a portion located
20 at an end on one side in the longitudinal direction (axial
direction) of the roller main body 30. A recessed portion
34a for attaching the shaft attachment section 81 is formed
at an end (end on the one side) on the outer side of the
first end base portion 34. The recessed portion 34a is
25 recessed towards the inner side in the axial direction, and
has a circular cross-section along the axial direction.
The second end base portion 35 is a portion located
at the end on the other side in the longitudinal direction
(axial direction) of the roller main body 30. The second
30 end base portion 35 is provided with a recessed portion 35a
and the gear portion 35b described above. The recessed
14
portion 35a is formed at the end (end on the other side)
on the outer side in the axial direction of the second end
base portion 35, and is a portion for attaching the shaft
attachment section 81. The recessed portion 35a is
5 recessed towards the inner side in the axial direction, and
has a circular cross-section along the axial direction.
The roller shaft 50 is a metal member that is arranged
inside the roller main body 30 and that integrally rotates
with the roller main body 30. As illustrated in FIG. 5,
10 the roller shaft 50 is configured by a shaft central portion
51, a first shaft end 52, and a second shaft end 53.
The shaft central portion 51 is located at a center
in the axial direction of the roller shaft 50, and is located
inside the roller main body 30. An outer diameter of the
15 shaft central portion 51 is greater than an outer diameter
of the first shaft end 52 and an outer diameter of the second
shaft end 53. The shaft attachment sections 81 are attached
to outer surfaces of the first shaft end 52 and the second
shaft end 53, respectively.
20 The shaft attachment section 81 is a substantially
cylindrical member made of resin. Hereinafter, an end
located close to the roller main body 30 and a proximity
thereof in the shaft attachment section 81 may be referred
to as a first end, and an opposite end and a proximity thereof
25 may be referred to as a second end (see FIG. 4A) . The shaft
attachment section 81 is provided with a through-hole 81a,
and the first shaft end 52 (second shaft end 53) is inserted
to the through-hole 81a. The shaft attachment section 81
includes a roller contacting portion 81b, a supporting
30 section contacting portion 81c, and a cover section
attachment portion 81d.
15
The roller contacting portion 81b is a portion
located at the end (first end) on the inner side in the axial
direction of the shaft attachment section 81. The roller
contacting portion 81b is a portion to be attached to the
5 recessed portion 34a of the first end base portion 34 of
the roller main body 30. The roller contacting portion 81b
has a circular plate-shaped outer appearance (circular
cross-section along the axial direction). The roller
contacting portion 81b is attached to the first end base
10 portion 34 in a relatively rotatable manner. Therefore,
even if the roller main body 30 and the roller shaft 50 rotate,
the shaft attachment section 81 does not rotate. The fluffs
thus can be prevented from being wound around the shaft
attachment section 81.
15 The outer diameter of the roller contacting portion
81b is greater than the outer diameter of the outer side
portion of the shaft attachment section 81 (in the portion
of the shaft attachment section 81, a portion located on
the opposite side of the roller main body 30, i.e., the
20 second end side of the roller contacting portion 81b) . In
other words, the portion having a larger diameter than the
roller contacting portion 81b does not exist on the outer
side of the roller contacting portion 81b. Therefore, the
portion that becomes an obstacle when the roller contacting
25 portion 81b enters the inner side of the roller main body
30 does not exist in the shaft attachment section 81, and
the boundary between the shaft attachment section 81 and
the first end base portion 34 of the roller main body 30
can be located further inside the recessed portion 34a. As
30 a result, the fluffs can be more reliably prevented from
entering inside. Furthermore, a situation can be
16
prevented in which the portion having a larger diameter than
the roller contacting portion 81b makes contact with the
end face in the axial direction of the roller main body 30
thus forming the boundary exposed to the outer side of the
5 roller main body 30, and the fluffs enter inside from the
exposed boundary. In other words, since the boundary
between the first end base portion 34 of the roller main
body 30 and the shaft attachment section 81 is located on
the inner side of the first end base portion 34, the fluffs
10 is less likely to enter between the shaft attachment section
81 and the first end base portion 34.
As illustrated in FIG. 6A, the supporting section
contacting portion 81c is a portion supported by a
supporting section 77 adapted to support the first roller
15 67. As illustrated in FIG. 6B, the supporting section
contacting portion 81c has a shape in which the circle is
cut out (a part of the circle is linear) in the
cross-sectional view taken along a plane perpendicular to
the axial direction. Specifically, in the supporting
20 section contacting portion 81c, only one surface and the
other surface making contact with the supporting section
77 are formed in a linear shape. The shaft attachment
section 81 thus can be stably held, and the shaft attachment
section 81 can be more reliably prevented from rotating.
25 The cover section attachment portion 81d is a portion
located on the end (second end) on the outer side in the
axial direction of the shaft attachment section 81. The
outer diameter of the cover section attachment portion 81d
is greater than the outer diameter of a portion (portion
30 close to the roller main body 30) of the shaft attachment
section 81 adjacent on the inner side in the axial direction
17
than the cover section attachment portion 81d. The cover
section 85 is attached to the cover section attachment
portion 81d. The cover section 85 is made of resin, and
can be elastically deformed. Therefore, the cover section
5 85 can be attached to the cover section attachment portion
81d by simply widening an opening of the cover section 85
and placing the cover section 85 over the cover section
attachment portion 81d.
The E-rings 83 are respectively attached to both ends
10 of the roller shaft 50. The E-ring 83 is a member that
prevents the shaft attachment section 81 from detaching
from the roller shaft 50 . The cover section 85 collectively
covers the first shaft end 52 (second shaft end 53), the
shaft attachment section 81, and the E-ring 83. The fluffs
15 thus can be prevented from getting caught at the
above-described portions.
Next, with reference to FIGS. 5 and 7, a description
will be made on the problems of the prior art and differences
between structures of the present embodiment and a
20 conventional product.
A conventional belt guide roller 100 includes a
roller main body 101, a roller shaft 102, a shaft attachment
section 103, and an E-ring 104. A boundary between an end
101a of the roller main body 101 and the shaft attachment
25 section 103 is exposed to an outer side of the belt guide
roller 100. Thus, when fluffs are wound around the belt
guide roller 100, the fluffs easily enter inside. As a
result, resistance is generated between the roller main
body 101 and the roller shaft 102, and a rotation failure
30 of the belt guide roller 100 may occur. Furthermore, since
the E-ring 104 is exposed, the fluffs may get entangled with
18
the E-ring 104.
On the contrary, in the first roller (belt guide
roller) 67 of the present embodiment, the boundary between
the end of the roller main body 30 and the shaft attachment
5 section 81 is located on the inner side of the roller main
body 30 . Thus, even if the fluffs are wound around the first
roller 67, the fluffs are less likely to enter inside. As
a result, the rotation failure of the first roller 67 is
less likely to occur. Furthermore, since the E-ring 83 is
10 covered by the cover section 85, the fluffs can be prevented
from getting entangled with the E-ring 83.
As described above, the first roller 67 of the present
embodiment includes the roller main body 30, the roller
shaft 50 of the roller main body 30, and the shaft attachment
15 section 81. The roller main body 30 makes contact with the
cleaning belt 74 for cleaning the draft roller to guide the
cleaning belt 74. The shaft attachment section 81 is
attached to cover at least a part of the outer surface of
the roller shaft 50. The roller main body 30 is provided
20 with recessed portions 34a and 35a recessed in the axial
direction of the roller shaft 50. The shaft attachment
section 81 is formed to enter the respective recessed
portions 34a and 35a.
Since the shaft attachment section 81 is formed to
25 enter the roller main body 30, the boundary between the
shaft attachment section 81 and the roller main body 30
exists on the inner side of the recessed portions 34a, 35a.
Therefore, even if the fluffs are wound around the first
roller 67, the fluffs can be suppressed from entering
30 between the roller main body 30 and the shaft attachment
section 81. Thus, the rotation failure of the cleaning belt
19
74 can be prevented.
In the first roller 67 of the present embodiment, the
roller main body 30 is provided with the recessed portions
34a, 35a having a circular cross-section perpendicular to
5 the axial direction. The shaft attachment section 81
includes the roller contacting portion 81b that enters the
recessed portions 34a, 35a of the roller main body 30 at
the end (first end) on the roller main body 30 side, and
the cross-section perpendicular to the axial direction of
10 the roller contacting portion 81b is circular. The
circular shape is formed with the roller shaft as the
center.
The recessed portions 34a, 35a and the roller
contacting portion 81b are formed in a circular shape, so
15 that the operation of connecting the shaft attachment
section 81 to the roller main body 30 can be facilitated.
The cleaning device 60 of the present embodiment
includes the supporting section 77 adapted to support the
shaft attachment section 81. The shaft attachment section
20 81 includes the supporting section contacting portion 81c,
which is the portion where the supporting section 77 makes
contact. In the supporting section contacting portion 81c,
the portion that makes contact with the supporting section
77 is linear in the cross-sectional shape perpendicular to
25 the axial direction.
Thus, the rotation of the shaft attachment section
81 can be reliably prevented compared to the case where the
cross-section of the supporting section contacting portion
81c is circular. The shaft attachment section 81 can also
30 be stably supported.
The preferred embodiments of the present invention
20
have been described above, but the structures described
above may be modified as below.
In the embodiment described above, the shaft
attachment section 81 enters the recessed portions 34a, 35a
5 formed in the roller main body 30 . However, the roller main
body 30 may enter the recessed portion formed in the shaft
attachment section 81.
In the embodiment described above, the shapes of the
roller contacting portion 81b of the shaft attachment
10 section 81 and the recessed portions 34a, 35a are not
limited to a circular shape, and may be appropriately
changed. The shapes of the roller contacting portion 81b
and the recessed portions 34a, 35a are preferably formed
in a shape having the roller shaft 50 as the center. If
15 the shaft attachment section 81 integrally rotates with the
roller main body 30, the roller contacting portion 81b and
the recessed portions 34a, 35a need to be formed in a
circular shape.
The E-ring 83 of the embodiment described above can
20 be changed to a retaining ring such as a snap ring and the
like, for example.
The arrangement of the top roller and the bottom
roller of the draft device 7 described above is an example.
The positional relationship of the top roller and the bottom
25 roller, the number of draft roller pairs, or the like may
be appropriately changed. Therefore, the top roller may
be arranged on the lower side, and the cleaning device may
be arranged for the top roller.
The material and the shape of each member
30 constituting the cleaning device 60 are arbitrary, and may
be appropriately changed.
21
According to a first aspect of the present invention,
a belt guide roller includes a roller main body, a roller
shaft of the roller main body, and a shaft attachment
section. The roller main body makes contact with a cleaning
5 belt for cleaning the draft roller to guide the cleaning
belt. The shaft attachment section is attached to cover
at least a part of the outer surface of the roller shaft.
One of the roller main body and the shaft attachment section
is provided with a recessed portion recessed in an axial
10 direction of the roller shaft, and the other of the roller
main body or the shaft attachment section is formed to enter
the recessed portion.
Since one of the roller main body and the shaft
attachment section is formed to enter the other of the
15 roller main body and the shaft attachment section, a
boundary between the roller main body and the shaft
attachment section exists in the recessed portion.
Therefore, even if the fluffs are wound around the belt
guide roller, the fluffs can be suppressed from entering
20 between the roller main body and the shaft attachment
section. Thus, the rotation failure of the belt guide
roller can be prevented. Furthermore, stopping of the
cleaning belt and wearing of the surface of the cleaning
belt can be prevented.
25 In the belt guide roller described above, the
recessed portion is preferably formed in a shape having the
roller shaft as a center.
The belt guide roller described above preferably has
the following configuration. That is, the roller main body
30 is provided with the recessed portion having a circular
cross-section perpendicular to the axial direction. The
22
shaft attachment section includes a first end located close
to the roller main body and a second end located opposite
to the first end, the first end including a roller
contacting portion that enters the recessed portion of the
5 roller main body, and the cross-section perpendicular to
the axial direction of the roller contacting portion is
circular.
A size of the shaft attachment section can be reduced
by forming the recessed portion on the roller main body side
10 Furthermore, an operation of connecting the shaft
attachment section to the roller main body can be
facilitated by forming the recessed portion and the roller
contacting portion in a circular shape.
In the belt guide roller described above, the shaft
15 attachment section is preferably formed such that an outer
diameter of the roller contacting portion is greater than
an outer diameter of a portion on the second end side of
the roller contacting portion.
Thus, the portion having a larger diameter than the
20 roller contacting portion' does not exist on the axially
outer side of the roller contacting portion. Therefore,
a portion that becomes an obstacle when the roller
contacting portion enters an inner side of the roller main
body does not exist in the shaft attachment section, and
25 the boundary between the shaft attachment section and the
roller main body can be located further inside the recessed
portion. As a result, the fluffs can be more reliably
prevented from entering inside. Furthermore, a situation
can be prevented in which the portion having a larger
30 diameter than the roller contacting portion makes contact
with an end face in the axial direction of the roller main
23
body thus forming the boundary exposed to an outer side of
the roller main body, and the fluffs enter inside from the
exposed boundary.
In the belt guide roller described above, the shaft
5 attachment section preferably supports the roller shaft in
a relatively rotatable manner.
The rotation of the roller main body is thus not
transmitted to the shaft attachment section, whereby
possibility of the fluffs being wound around the shaft
10 attachment section can be reduced.
The belt guide roller described above preferably
includes a cover section attached to the second end of the
shaft attachment section and attached to cover the second
end.
15 Thus, even if a projection or the like is provided
at the second end of the shaft attachment section, the
fluffs can be prevented from being wound around the
projection or the like.
In the belt guide roller described above, the cover
20 section is preferably an elastic member.
Thus, the cover section can be attached without using
a bolt and a tool.
The belt guide roller described above preferably has
the following configuration. That is, the belt guide
25 roller further includes a fall-out preventing section
attached to the second end of the shaft attachment section
to prevent the shaft attachment section from falling out
from the roller main body. The cover section is attached
to cover the fall-out preventing section.
30 The fluffs thus can be prevented from making contact
with the fall-out preventing section and getting entangled.
24
According to a second aspect of the present invention,
there is provided a cleaning device including the belt guide
roller described above, and a cleaning belt guided by the
belt guide roller.
5 The cleaning device in which the rotation failure of
the cleaning belt is less likely to occur is thereby
realized.
The cleaning device described above preferably has
the following configuration. That is, the cleaning device
10 includes a supporting section adapted to support the shaft
attachment section. The shaft attachment section includes
a supporting section contacting portion, which is a portion
where the supporting section makes contact. The
supporting section contacting portion has a
15 cross-sectional shape perpendicular to the axial direction
of the portion in contact with the supporting section formed
in a linear shape.
Thus, the supporting section contacting portion can
reliably prevent the rotation of the shaft attachment
20 section compared to the case where the cross-section is
circular. The shaft attachment section can also be stably
supported.
According to a third aspect of the present invention,
there is provided a draft device including the cleaning
25 device and a plurality of draft roller pairs. Each of the
• plurality of draft roller pairs is configured by a top
roller and a bottom roller. The cleaning belt is arranged
to make contact with the plurality of top rollers. In the
draft device, the top roller located second from downstream
30 in a draft direction includes a feeding cam section, the
feeding cam section intermittently driving the belt guide
25
roller.
Thus, the drive of the cleaning belt is stopped when
not necessary by intermittently driving the belt guide
roller, so that a large relative speed difference can be
given with respect to the outer peripheral surfaces of the
top rollers to be cleaned. As a result, a more satisfactory
cleaning effect is obtained.
According to a fourth aspect of the present invention,
there is provided a spinning machine including the draft
device, a pneumatic spinning device, and a winding device.
The pneumatic spinning device is adapted to twist a fiber
bundle drafted by the draft device using an airflow to
produce a spun yarn. The winding device is adapted to wind
the spun yarn supplied from the pneumatic spinning device
into a package.
The spinning machine in which the rotation failure
of the cleaning belt is less likely to occur is thereby
realized.
26
We claim:
1. A belt guide roller characterized by comprising:
a roller main body adapted to make contact with a
cleaning belt for cleaning a draft roller to guide the
cleaning belt;
a roller shaft of the roller main body; and
a shaft attachment section attached to cover at least
a part of an outer surface of the roller shaft,
wherein one of the roller main body and the shaft
attachment section is provided with a recessed portion
recessed in an axial direction of the roller shaft, and
the other of the roller main body and the shaft
attachment section is formed to enter the recessed portion.
2. The belt guide roller according to claim 1,
characterized in that
the recessed portion is formed in a shape having the
roller shaft as a center.
3. The belt guide roller according to claim 1 or 2,
characterized in that
the roller main body is provided with the recessed
portion having a circular cross-section perpendicular to
the axial direction; and
the shaft attachment section includes a first end
located close to the roller main body and a second end
located opposite to the first end, the first end including
a roller contacting portion that enters the recessed
portion of the roller main body, and a cross-section
perpendicular to the axial direction of the roller
27
contacting portion is circular.
4. The belt guide roller according to claim 3,
characterized in that
the shaft attachment section is formed such that an
outer diameter of the roller contacting portion is greater
than an outer diameter of a portion on the second end side
of the roller contacting portion.
5. The belt guide roller according to claim 3 or 4,
characterized in that
the shaft attachment section supports the roller
shaft in a relatively rotatable manner.
6. The belt guide roller according to claim 5,
characterized by further comprising:
a cover section attached to the second end of the shaft
attachment section and attached to cover the second end.
7. The belt guide roller according to claim 6,
characterized in that
the cover section is an elastic member.
8. The belt guide roller according to claim 6 or 7,
characterized by further comprising:
a fall-out preventing section attached to the second
end of the shaft attachment section to prevent the shaft
attachment section from falling out from the roller main
body,
wherein the cover section is attached to cover the
fall-out preventing section.
28
9. A cleaning device characterized by comprising:
the belt guide roller according to any one of claims
1 to 8; and
a cleaning belt guided by the belt guide roller.
10. The cleaning device according to claim 9,
characterized by further comprising:
a supporting section adapted to support the shaft
attachment section,
wherein the shaft attachment section includes a
supporting section contacting portion, which is a portion
where the supporting section makes contact, and
the supporting section contacting portion has a
cross-sectional shape perpendicular to the axial direction
of the portion in contact with the supporting section formed
in a linear shape.
11. A draft device characterized by comprising:
the cleaning device according to claim 9 or 10; and
a plurality of draft roller pairs,
wherein each of the plurality of draft roller pairs
is configured by a top roller and a bottom roller,
the cleaning belt is arranged to make contact with
the plurality of top rollers, and
the top roller located second from downstream in a
draft direction is provided with a feeding cam section, the
feeding cam section intermittently driving the belt guide
roller.
12. A spinning machine characterized by comprising:
29
the draft device according to claim 11;
a pneumatic spinning device adapted to twist a fiber
bundle drafted by the draft device using an airflow to
produce a spun yarn; and
a winding device adapted to wind the spun yarn
supplied from the pneumatic spinning device into a package.