YARN ACCUMULATING DEVICE, YARN WINDING UNIT INCLUDING THE
SAME, AND YARN WINDING MACHINE INCLUDING THE SAME
BACKGROUND OF THE INVENTION
1. Field 5 of the Invention
The present invention relates to a shape of a yarn
removal member adapted to remove a yarn from a yarn hooking
member in a yarn accumulating device adapted to accumulate
the yarn by winding the yarn around a yarn accumulating
10 roller by the rotating yarn hooking member.
2. Description of the Related Art
In some cases, a yarn winding machine such as a fine
spinning machine includes a yarn accumulating device
15 adapted to temporarily accumulate a yarn to be wound.
Japanese Patent Application Laid-open No. 2013-67891
(Patent Document 1) describes such a yarn accumulating
device. The yarn accumulating device described in Patent
Document 1 includes a yarn accumulating roller adapted to
20 accumulate a yarn by winding the yarn around a peripheral
surface thereof. The yarn accumulating device includes a
yarn hooking member for winding the yarn around the yarn
accumulating roller. The yarn hooking member is formed
into a shape on which the yarn can be hooked. Since the
25 yarn hooking member with the yarn hooked thereon is
integrally rotated with the yarn accumulating roller, the
yarn is wound around the yarn accumulating roller.
A yarn removal lever adapted to remove the yarn from
the yarn hooking member is arranged in proximity to the yarn
30 accumulating device described in Patent Document 1. The
yarn removal lever in Patent Document 1 is arranged to be
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capable of vertically swinging between an elevated position
and a lowered position with a swing shaft as a center. The
yarn removal lever is arranged to not make contact with a
yarn path when located at the lowered position. By moving
the yarn removal lever to the elevated position, the 5 e yarn
hooked on the yarn hooking member is pushed upward by the
yarn removal lever, and thus the yarn can be removed from
the yarn hooking member.
10 SUMMARY OF THE INVENTION
In the configuration as described above, when a
position to which the yarn is pushed upward by the yarn
removal lever is excessively low, the yarn cannot be removed.
When the position to which the yarn is pushed upward is
15 excessively high, behavior of the yarn becomes unstable,
and thus eventually the yarn cannot be removed from the yarn
hooking member in some cases.
An object of the present invention is to provide a
configuration of a yarn removal lever that enables the yarn
20 to be reliably removed from the yarn hooking member.
A yarn accumulating device comprises a yarn
accumulating roller arranged to rotate under a state in
which a running yarn is wound around a peripheral surface
thereof; a yarn hooking member arranged capable of
25 integrally rotating with the yarn accumulating roller and
adapted to guide the yarn; and a yarn removal member having
a contacting surface, the contacting surface being arranged
movable between a standby position and a yarn removal
position and being adapted to be capable of making contact
30 with the yarn, the yarn removable member being adapted to
remove the yarn from the yarn hooking member by moving the
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contacting surface to the yarn removal position, wherein
the contacting surface includes a first portion and a second
portion, in a direction in which the contacting surface
moves from the standby position towards the yarn removal
position, the first portion is located upstream 5 of the
second portion, and under a state in which the contacting
surface has been moved to the yarn removal position, at
least a portion of the first portion is located downstream
of the yarn accumulating roller in a running direction of
10 the yarn.
A yarn winding unit comprises the yarn accumulating
device; a draft device adapted to supply a fiber bundle;
a spinning device adapted to apply twists to the fiber
bundle and to produce a spun yarn; and a winding device
15 adapted to wind the spun yarn, wherein the yarn accumulating
device is adapted to temporarily accumulate the spun yarn
between the spinning device and the winding device.
A yarn winding machine comprises a plurality of the
yarn winding units; and a service carrier arranged to travel
20 among the plurality of the yarn winding units, the service
carrier including a drive source adapted to move the
contacting surface between the standby position and the
yarn removal position.
25 BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a front view illustrating an overall
structure of a fine spinning machine according to an
embodiment of the present invention;
FIG. 2 is a side view illustrating a spinning unit
30 and a yarn joining carrier;
FIG. 3 is a perspective view illustrating a portion
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around a yarn accumulating device;
FIG. 4A is a front view illustrating the yarn
accumulating device;
FIG. 4B is a side view illustrating the yarn
5 accumulating device;
FIG. 5A is a front view illustrating a state in which
a flyer is located in a yarn removal region;
FIG. 5B is a front view illustrating a state in which
a spun yarn has been removed from the flyer by being pushed
10 upward;
FIG. 6A is a front view illustrating a state in which
the flyer is located in a yarn non-removal region;
FIG. 6B is a front view illustrating a state in which
the spun yarn cannot be removed from the flyer even when
15 pushed upward;
FIGS. 7A-7D are each a view illustrating a state in
which the spun yarn is moved on a contacting surface of a
yarn removal lever;
FIG. 8 is a plan view illustrating the yarn
20 accumulating device;
FIG. 9 is a front view illustrating a shape of the
yarn removal lever;
FIG. 10 is a side view illustrating yarn joining
operation performed by the yarn joining carrier;
25 FIG. 11A is a plan view illustrating the yarn
accumulating device of a comparative example; and
FIG. 11B is a front view illustrating a state in which
the yarn is pushed upward in the yarn accumulating device
of the comparative example.
30
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
6 / 36
Next, a fine spinning machine (a yarn winding
machine) according to an embodiment of the present
invention will be described with reference to the
accompanying drawings. A fine spinning machine 1 serving
as the yarn winding machine illustrated in FIG. 1 5 includes
a large number of spinning units (yarn winding units) 2
arranged side by side and a yarn joining carrier (a service
carrier) 3. In the present specification, FIG. 4A and FIG.
4B, FIG. 5A and FIG. 5B, FIG. 6A and FIG. 6B, FIGS. 7A-7D,
10 and FIG. 11A and FIG. 11B may be respectively referred to
as simply FIG. 4, FIG. 5, FIG. 6, FIG. 7, and FIG. 11.
Each of the spinning units 2 includes a draft device
7, a spinning device 9, a yarn accumulating device 12, and
a winding device 13 arranged in this order from upstream
15 towards downstream. When wordings of “upstream” and
“downstream” are simply used in the present specification,
upstream and downstream in a running direction of a fiber
bundle and a yarn at the time of spinning are respectively
meant. Each spinning unit 2 is adapted to spin a fiber
20 bundle 8, which is fed from the draft device 7, by the
spinning device 9 to produce a spun yarn 10, and to wind
the spun yarn 10 around a bobbin 48 by the winding device
13 to form a package 45.
The draft device 7 is adapted to produce the fiber
25 bundle 8 by stretching a sliver 15. As illustrated in FIG.
2, the draft device 7 includes four pairs of rollers, i.e.
a pair of back rollers 16, a pair of third rollers 17, a
pair of middle rollers 19, and a pair of front rollers 20
arranged in this order from upstream. An apron belt 18 is
30 provided to each roller of the pair of middle rollers 19.
The spinning device 9 is arranged immediately
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downstream of the front rollers 20. The fiber bundle 8 from
the draft device 7 is fed to the spinning device 9. The
spinning device 9 is adapted to apply twists to the fiber
bundle 8 fed from the draft device 7 to produce the spun
yarn 10. In the present embodiment, a pneumatic 5 spinning
device adapted to apply twists to the fiber bundle 8 by use
of whirling airflow is used.
The winding device 13 is arranged downstream of the
spinning device 9. The winding device 13 includes a cradle
10 arm 71 supported swingably about a support shaft 73. The
cradle arm 71 can support in a rotatable manner, a bobbin
48 around which the spun yarn 10 is wound.
The winding device 13 includes a winding drum 72 and
a traverse device 75. The winding drum 72 is driven while
15 being in contact with an outer peripheral surface of the
bobbin 48 or an outer peripheral surface of the package 45.
The traverse device 75 includes a traverse guide 76 capable
of engaging with the spun yarn 10. The winding device 13
is adapted to drive the winding drum 72 by an electric motor
20 (not illustrated) while reciprocating the traverse guide
76 by a drive device (not illustrated). Accordingly, the
winding device 13 rotates the package 45 in contact with
the winding drum 72 and winds the spun yarn 10 while
traversing the spun yarn 10.
25 The yarn accumulating device 12 is arranged between
the spinning device 9 and the winding device 13. As
illustrated in FIG. 2, the yarn accumulating device 12
includes a yarn accumulating roller 21 and an electric motor
25 adapted to rotationally drive the yarn accumulating
30 roller 21.
The yarn accumulating roller 21 is a roller-shaped
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member adapted to be rotationally driven under a state in
which the spun yarn 10 is wound around an outer peripheral
surface thereof. Accordingly, the running spun yarn 10 can
be temporarily accumulated by being wound around the outer
peripheral surface of the yarn accumulating roller 21. T5 he
yarn accumulating device 12 can function as a kind of a
buffer by temporarily accumulating the spun yarn 10.
Accordingly, a defect (for example, a slackening in the spun
yarn 10) in a case in which a spinning speed in the spinning
10 device 9 and a winding speed in the winding device 13 do
not correspond to each other for some reason can be
resolved.
A yarn clearer (a yarn quality measuring device) 52
is provided at a position between the spinning device 9 and
15 the yarn accumulating device 12. The spun yarn 10 spun from
the spinning device 9 passes the yarn clearer 52 before
being wound by the yarn accumulating device 12. The yarn
clearer 52 is adapted to monitor the running spun yarn 10
by an optical sensor (not illustrated), and to transmit
20 a yarn defect detection signal to a unit controller (not
illustrated) when detecting a yarn defect (a portion of the
spun yarn 10 having an abnormality in thickness or the like)
in the spun yarn 10. The yarn clearer 52 may be provided
with a capacitance sensor and may detect a presence and/or
25 an absence of a foreign substance in the spun yarn 10 as
a yarn defect.
The yarn joining carrier 3 is capable of travelling
in a direction in which the spinning units 2 are arranged
(a left-right direction in FIG. 1). As illustrated in FIGS.
30 1 and 2, the yarn joining carrier 3 includes a splicer (a
yarn joining device) 43 and a yarn catching members 44, 46.
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After a yarn cut or a yarn breakage has occurred in a spinning
unit 2, the yarn joining carrier 3 travels to such a spinning
unit 2. The yarn joining carrier 3 then sucks and catches
yarn ends of the disconnected spun yarn 10 by the yarn
catching members 44, 46 and guides the caught yarn ends 5 to
the splicer 43. The splicer 43 joins the guided yarn ends
together (yarn joining operation). A state in which the
yarn joining operation is being performed by the splicer
43 is illustrated in FIG. 10.
10 Next, a configuration of the yarn accumulating device
12 will be described in more detail with reference to FIGS.
2, 3, 4, and the like. As illustrated in FIGS. 2 and 3,
the yarn accumulating device 12 includes a yarn hooking
member 22, a downstream guide 26, a yarn removal lever (a
15 yarn removal member) 28 in addition to the above-described
yarn accumulating roller 21.
The yarn hooking member 22 is arranged at a downstream
end 21a of the yarn accumulating roller 21. Since the spun
yarn 10 runs while being wound around the yarn accumulating
20 roller 21 in the yarn accumulating device 12, to be exact,
the spun yarn 10 runs in a spiral manner. In the present
specification, a wording of a “running direction of the spun
yarn 10” used in a description relating to the yarn
accumulating device 12 refers to a direction in which an
25 element parallel to an axial line of the yarn accumulating
roller 21 faces, among the running direction of the spun
yarn 10 running in a spiral manner. In FIG. 4B, for example,
the “running direction of the spun yarn 10” is leftward (a
direction indicated by a thick arrow).
30 The yarn hooking member 22 includes a flyer shaft 33
and a flyer 38.
10 / 36
The flyer shaft 33 is arranged to be capable of
relatively rotating with respect to the yarn accumulating
roller 21 about a rotational axis of the yarn accumulating
roller 21 with a base-end portion as a center. A
predetermined resistance torque is applied between 5 the
flyer shaft 33 and the rotational axis of the yarn
accumulating roller 21. Thus, as long as a force that
surpasses the resistance torque is not applied to the flyer
shaft 33, the yarn hooking member 22 is integrally rotated
10 with the yarn accumulating roller 21.
The flyer 38 is fixed at a tip end of the flyer shaft
33. The flyer 38 is formed into a shape by which the spun
yarn 10 can be guided (hooked). More specifically, the
flyer 38 is formed into a hook shape. As illustrated in
15 FIG. 4A, when seen in a direction of the rotational axis
of the yarn accumulating roller 21, a tip end 38a of the
hook-shaped flyer 38 faces downstream in a rotational
direction of the yarn accumulating roller 21.
As illustrated in FIG. 4B, when seen in a direction
20 perpendicular to the rotational axis of the yarn
accumulating roller 21, the tip end 38a of the hook-shaped
flyer 38 faces upstream in the running direction of the spun
yarn 10. In the present embodiment, the tip end 38a of the
flyer 38 is located upstream of the downstream end 21a of
25 the yarn accumulating roller 21.
By the flyer 38 formed in this manner, the running
spun yarn 10 can be guided. Since the yarn hooking member
22 is integrally rotated with the yarn accumulating roller
21 under a state in which the spun yarn 10 has been guided
30 to the flyer 38, the spun yarn 10 can be wound around the
yarn accumulating roller 21.
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When the force that surpasses the resistance torque
is applied to the yarn hooking member 22, the yarn hooking
member 22 is relatively rotated with respect to the yarn
accumulating roller 21. Accordingly, since the flyer 38
guiding the spun yarn 10 is relatively rotated with 5 respect
to the yarn accumulating roller 21, the spun yarn 10 can
be drawn from the downstream end 21a of the yarn
accumulating roller 21.
The downstream guide 26 is arranged slightly
10 downstream of the yarn accumulating roller 21. The
downstream guide 26 is adapted to regulate a trajectory of
the spun yarn 10 swung by the rotating flyer 38.
Accordingly, the downstream guide 26 guides the spun yarn
10 while stabilizing a running path of the spun yarn 10
15 located downstream.
As illustrated in FIG. 3, the yarn removal lever 28
is formed as a substantially L-shaped member having an
elongated contacting surface 30 arranged in a substantially
horizontal direction. The yarn removal lever 28 of the
20 present embodiment has a shape formed by cutting a metal
plate member into a predetermined shape and appropriately
folding the cut metal plate member. The contacting surface
30 is formed of an end surface portion of the metal plate
member, and the contacting surface 30 is constant in width.
25 A base portion of the yarn removal lever 28 is
supported by a swing shaft 29. By swinging with the swing
shaft 29 as a center, the yarn removal lever 28 can move
the contacting surface 30 between a standby position
indicated by a solid line in FIG. 4 and a yarn removal
30 position indicated by a chain line in FIG. 4. A direction
in which the contacting surface 30 is moved from the standby
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position towards the yarn removal position is referred to
as a “moving direction” of the contacting surface 30 (see
FIG. 4).
As illustrated in FIG. 4B, the contacting surface 30
is arranged in proximity to the downstream end 21a 5 of the
yarn accumulating roller 21. When the contacting surface
30 is located at the standby position, the yarn removal
lever 28 is in a state of not being in contact with a yarn
path of the spun yarn 10. By swinging the yarn removal lever
10 28 from this state and moving the contacting surface 30 to
the yarn removal position, the spun yarn 10 can be removed
from the flyer 38. A state in which the spun yarn 10 is
removed from the flyer 38 will be described later.
Since the yarn removal lever 28 is urged by a spring
15 member (not illustrated), the contacting surface 30 is held
at the standby position.
In the present embodiment, the yarn removal lever 28
is driven by a drive source (an air pressure cylinder 49
in the present embodiment) provided to the yarn joining
20 carrier 3. As illustrated in Fig. 10, since the yarn joining
carrier 3 advances a rod of the air pressure cylinder 49,
the air pressure cylinder 49 pushes the yarn removal lever
28. Accordingly, the yarn removal lever 28 is swung, and
the contacting surface 30 is moved from the standby position
25 to the yarn removal position. Consequently, the spun yarn
10 can be removed from the flyer 38.
When the yarn joining carrier 3 causes the rod of the
air pressure cylinder 49 to recede, the yarn removal lever
28 is swung to an original position by the urging force of
30 the spring member, and the contacting surface 30 is returned
to the standby position. Accordingly, the spun yarn 10 is
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guided to the flyer 38 again.
With the above-described configuration, since the
yarn joining carrier 3 can appropriately control swing of
the yarn removal lever 28 at the time of the yarn joining
operation, the spun yarn 10 can be removed from the 5 flyer
38 at any timing, and guiding of the spun yarn 10 by the
flyer 38 can be started at any timing. Accordingly, the
yarn joining carrier 3 can appropriately perform the yarn
joining operation. Since control of the yarn removal lever
10 28 at the time of the yarn joining operation is publicly
known as described in Patent Document 1, for example,
detailed description is omitted.
In the present embodiment, as described above, the
yarn joining carrier 3 includes the drive source (the air
15 pressure cylinder 49) that swings the yarn removal lever
28. A drive source that swings the yarn removal lever 28
is thus not provided to each spinning unit 2. Accordingly,
the spinning unit 2 can be configured at a low cost, and
cost for the overall fine spinning machine 1 can be reduced.
20 Next, the state in which the spun yarn 10 is removed
from the flyer 38 by the yarn removal lever 28 will be
described.
When the yarn removal lever 28 is swung in the
direction (the moving direction) in which the contacting
25 surface 30 is moved from the standby position to the yarn
removal position, the contacting surface 30 makes contact
with the spun yarn 10 located downstream of the flyer 38
(the spun yarn 10 between the flyer 38 and the downstream
guide 26). By further swinging the yarn removal lever 28
30 under the state in which the spun yarn 10 is being made in
contact with the contacting surface 30, the spun yarn 10
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can be moved towards the yarn removal position (an upper
side in FIG. 4) by the contacting surface 30. In the
following description, in consideration of
understandability, moving the spun yarn 10 towards the yarn
removal position may be simply described as “5 pushing the
spun yarn 10 upward” (however, this wording is for
convenience sake in the description, and there is no
intention to limit a direction of moving the spun yarn 10
to an upper direction).
10 For example, in FIG. 5A, the tip end 38a of the flyer
38 is facing the yarn removal position (an upper side in
a case of FIG. 5A) when seen in a direction of a rotational
axis of the yarn hooking member 22. Thus, by swinging the
yarn removal lever 28 to move the contacting surface 30 to
15 the yarn removal position from this state and pushing the
spun yarn 10 by the contacting surface 30, the spun yarn
10 can be removed from the flyer 38 (a state in FIG. 5B).
In such a manner, when the tip end 38a of the flyer 38 is
facing the yarn removal position (an upper side in a case
20 of FIG. 5B), by swinging the yarn removal lever 28 and
pushing the spun yarn 10 upward by the contacting surface
30, the spun yarn 10 can be removed from the flyer 38.
However, since the yarn hooking member 22 is rotating
with the yarn accumulating roller 21, the flyer 38 is not
25 always located at a position in FIG. 5. The tip end 38a
of the flyer 38 thus faces various directions. For example,
in FIG. 6A, the tip end 38a of the flyer 38 is facing the
standby position (a lower side in a case of FIG. 6A) when
seen in the rotational axis direction of the yarn hooking
30 member 22. Under this state, even if the spun yarn 10 is
pushed upward by the contacting surface 30, the spun yarn
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10 cannot be removed from the flyer 38 (a state in FIG. 6B).
For example, in FIG. 6B, in spite of pushing the spun yarn
10 upward by the contacting surface 30, the spun yarn 10
is still hooked on the flyer 38.
As illustrated in FIGS. 5 and 6, a plane that 5 passes
the rotational axis of the yarn hooking member 22 and is
parallel to the moving direction of the contacting surface
30 (upward directions in FIGS. 5 and 6) is assumed to be
a boundary plane A. Out of two regions partitioned by the
10 boundary plane A when seen in the rotational axis direction
of the yarn hooking member 22, one region is referred to
as a yarn removal region, and one region is referred to as
a yarn non-removal region. The yarn removal region is a
region where the tip end 38a of the flyer 38 faces the yarn
15 removal position (downstream in the moving direction of the
contacting surface 30, that is the upper sides in FIGS. 5
and 6). The yarn non-removal region is a region where the
tip end 38a of the flyer 38 faces the standby position
(upstream in the moving direction of the contacting surface
20 30, that is the lower sides in FIGS. 5 and 6).
When the flyer 38 is located in the yarn removal region,
the spun yarn 10 can be removed from the flyer 38 by being
pushed upward by the contacting surface 30 (FIG. 5).
When the flyer 38 is located in the yarn non-removal
25 region, the spun yarn 10 cannot be removed from the flyer
38 even if the spun yarn 10 is pushed upward by the contacting
surface 30 (FIG. 6). However, as described above, since
the yarn hooking member 22 is rotating with the yarn
accumulating roller 21, the flyer 38 is always moving. Thus,
30 wherever the flyer 38 is located, when the spun yarn 10 is
pushed upward by the contacting surface 30, the spun yarn
16 / 36
10 can be eventually removed from the flyer 38. This state
will be described with reference to FIG. 7.
As illustrated in FIG. 7A, when the spun yarn 10 is
pushed upward by the contacting surface 30, in a case in
which the flyer 38 is located in the yarn non-5 removal region,
the spun yarn 10 is not removed from the flyer 38. In this
case, the flyer 38 is sequentially moved as illustrated in
FIGS. 7B and 7C accompanying rotation of the yarn hooking
member 22 while guiding the spun yarn 10.
10 At this time, the spun yarn 10 is pulled towards the
yarn removal region (a left side in FIG. 7) by the moving
flyer 38. Consequently, as illustrated in FIGS. 7B, 7C,
and 7D, the spun yarn 10 is moved from a first portion 31
towards a second portion 32 on the contacting surface 30.
15 Subsequently, the flyer 38 enters the yarn removal
region while guiding the spun yarn 10 (FIG. 7D). Since the
flyer 38 enters the yarn removal region, and thus the tip
end 38a of the flyer 38 faces the yarn removal position (an
upper side of FIG. 7), the spun yarn 10 is removed from the
20 flyer 38 (FIG. 7D). As described above, even if the flyer
38 is located in the yarn non-removal region when the spun
yarn 10 is pushed upward by the contacting surface 30, the
spun yarn 10 can be eventually removed from the flyer 38.
Next, a characteristic configuration of the present
25 embodiment will be described.
As illustrated in FIG. 5 and the like, out of the
contacting surface 30, a portion with respect to the yarn
non-removal region is referred to as the first portion 31,
and a portion with respect to the yarn removal region is
30 referred to as the second portion 32.
The second portion 32 is located downstream of the
17 / 36
first portion 31 in the moving direction of the contacting
surface 30 (a position close to the yarn removal position
and close to an upper side in FIG. 5). Conversely, the first
portion 31 is located upstream of the second portion 32 in
the moving direction of the contacting surface 30 5 (a
position close to the standby position and close to a lower
side in FIG. 5).
Thus, when the contact surface 30 is moved to the yarn
removal position, the second portion 32 can move the spun
10 yarn 10 to a position higher than the first portion 31 can.
“High” and “low” indicate a height in a case in which
downstream (the upper sides in FIGS. 5 and 6) in the moving
direction (the upper directions in FIGS. 5 and 6) of the
contacting surface 30 is an upper side when seen in the
15 rotational axis direction of the yarn accumulating roller
21 (this wording is for convenience sake in the description
and there is no intention to limit the moving direction of
the contacting surface 30 to an upper direction).
With the above-described configuration, a height to
20 which the spun yarn 10 is pushed upward by the contacting
surface 30 can be differed between when the flyer 38 is
located in the yarn removal region and when the flyer 38
is located in the yarn non-removal region.
When the flyer 38 is located in the yarn removal region,
25 the spun yarn 10 can be pushed upward to a relatively high
position by the second portion 32 (see FIG. 5B).
Accordingly, the spun yarn 10 can be reliably removed from
the flyer 38.
When the flyer 38 is located in the yarn non-removal
30 region, even if the spun yarn 10 is pushed upward to a high
position, the spun yarn 10 cannot be removed from the flyer
18 / 36
38. If the spun yarn 10 is pushed upward to an excessively
high position when the flyer 38 is located in the yarn
non-removal region, behavior of the spun yarn 10 becomes
unstable, causing a defect in which the spun yarn 10 is
5 entangled with the yarn hooking member 22, for example.
As described above, the first portion 31 is located
at a position lower than the second portion 32. Thus, when
the flyer 38 is located in the yarn non-removal region, the
spun yarn 10 is pushed upward merely to a relatively low
10 position by the first portion 31 (see FIG. 6B). Accordingly,
the spun yarn 10 is not pushed upward to an unnecessarily
high position. Consequently, the behavior of the spun yarn
10 can be prevented from becoming unstable, and the defect
in which the spun yarn 10 is entangled with the yarn hooking
15 member 22, for example, can be prevented from occurring.
As illustrated in FIGS. 3, 4 and the like, the first
portion 31 and the second portion 32 are smoothly continuous
at the contacting surface 30 of the present embodiment. In
other words, as a whole, the contacting surface 30 is formed
20 in a curved-surface-shape (a curved shape) not to have an
edge.
As illustrated in FIG. 7, when the flyer 38 is located
in the yarn non-removal region, the spun yarn 10 is pushed
upward by the first portion 31. The spun yarn 10 is moved
25 towards the second portion 32 (the left side in FIG. 7) on
the contacting surface 30 by being pulled by the rotating
flyer 38. In the present embodiment, since the first
portion 31 and the second portion 32 are smoothly continuous
at the contacting surface 30, the spun yarn 10 can be
30 smoothly moved towards the second portion 32 on the
contacting surface 30. Thus, behavior of the spun yarn 10
19 / 36
can be prevented from becoming unstable when moving on the
contacting surface 30. Accordingly, when the flyer 38
enters the yarn removal region, the spun yarn 10 can be
reliably removed from the flyer 38 (FIG. 7D).
In the present embodiment, as illustrated in FIG. 5 8,
under a state in which the contacting surface 30 has been
moved to the yarn removal position, at least a portion of
the second portion 32 is positioned upstream of the tip end
38a of the flyer 38 in the running direction of the spun
10 yarn 10.
As described above, the flyer 38 is formed into the
hook shape to be capable of hooking the spun yarn 10 thereon,
and the tip end 38a of the flyer 38 faces upstream in the
running direction of the spun yarn 10 (see FIGS. 4A and 8).
15 Thus, in order to remove the spun yarn 10 from the flyer
38, the spun yarn 10 is required to be moved to a position
upstream of the tip end 38a of the flyer 38 in the running
direction of the spun yarn 10.
In the present embodiment, as described above, when
20 the contacting surface 30 is moved to the yarn removal
position, at least a portion of the second portion 32 is
located upstream of the tip end 38a of the flyer 38 in the
running direction of the spun yarn 10. Accordingly, the
spun yarn 10 that has been pushed upward by the second
25 portion 32 can be moved to a position upstream of the tip
end 38a of the flyer 38 in the running direction of the spun
yarn 10. Consequently, the spun yarn 10 can be reliably
removed from the flyer 38.
In the present embodiment, as illustrated in FIG. 8,
30 under the state in which the contacting surface 30 has been
moved to the yarn removal position, at least a portion of
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the first portion 31 is located at a position downstream
of the downstream end 21a of the yarn accumulating roller
21 in the running direction of the spun yarn 10.
A comparative example is illustrated in FIG. 11 to
describe an effect thereof. As illustrated in FIG. 15 1A,
in the comparative example, under the state in which the
contacting surface 30 has been moved to the yarn removal
position, all region of the first portion 31 is located
upstream of the downstream end 21a of the yarn accumulating
10 roller 21 in the running direction of the spun yarn 10.
In the comparative example in FIG. 11, when the spun
yarn 10 is pushed upward by the first portion 31, the spun
yarn 10 between the first portion 31 and the flyer 38 passes
a position where the spun yarn 10 overlaps with an outer
15 peripheral surface of the yarn accumulating roller 21 in
a radial direction. Thus, under this state, the spun yarn
10 is wound around the yarn accumulating roller 21 by the
rotating yarn hooking member 22 (a state illustrated in FIG.
11B). In the comparative example of FIG. 11, since the spun
20 yarn 10 is wound around the yarn accumulating roller 21 in
some cases when the spun yarn 10 is pushed upward by the
first portion 31, the spun yarn 10 may not be able to be
removed from the flyer 38.
In the present embodiment, under the state in which
25 the contacting surface 30 has been moved to the yarn removal
position, at least a portion of the first portion 31 is
located downstream of the downstream end 21a of the yarn
accumulating roller 21 in the running direction of the spun
yarn 10. Thus, in the present embodiment, when the spun
30 yarn 10 is pushed upward by the first portion 31, the spun
yarn 10 between the first portion 31 and the flyer 38 does
21 / 36
not overlap with the yarn accumulating roller 21 in the
radial direction. Accordingly, in the present embodiment,
even if the yarn hooking member 22 is rotated under the state
in which the spun yarn 10 is pushed upward by the first
portion 31, the spun yarn 10 is not wound around the 5 e yarn
accumulating roller 21 (see FIG. 7).
With the configuration of the present embodiment, the
spun yarn 10 pushed upward by the contacting surface 30 can
be prevented from being wound around the yarn accumulating
10 roller 21. Accordingly, since a case in which the spun yarn
10 cannot be removed from the flyer 38 does not occur, the
spun yarn 10 can be reliably removed from the flyer 38.
Since the spun yarn 10 is immediately removed from
the flyer 38 when the spun yarn 10 is pushed upward by the
15 second portion 32, the spun yarn 10 is not wound around the
yarn accumulating roller 21. Thus, there is no problem even
if the second portion 32 is located upstream of the
downstream end 21a of the yarn accumulating roller 21 in
the running direction of the spun yarn 10. In the present
20 embodiment, as illustrated in FIG. 8, under the state in
which the contacting surface 30 has been moved to the yarn
removal position, all region of the second portion 32 is
located upstream of the downstream end 21a of the yarn
accumulating roller 21 in the running direction of the spun
25 yarn 10.
As described above, in the present embodiment, by
devising a shape of the yarn removal lever 28, reliability
of yarn removal can be improved. Conversely, even if
processing accuracy of the yarn removal lever 28 or driving
30 accuracy of a configuration (the air pressure cylinder 49)
for driving the yarn removal lever 28 is low, the
22 / 36
reliability of the yarn removal can be sufficiently secured.
With the configuration of the present embodiment, accuracy
of the yarn removal lever 28 and the air pressure cylinder
49 is not required as much as before. Accordingly, the yarn
removal lever 28 and/or the air pressure cylinder 49 5 can
be configured at low cost, and cost for the overall fine
spinning machine 1 can be reduced.
Next, a shape of the contacting surface 30 will be
described in more detail.
10 As illustrated in FIG. 9, a distance between an
upstream end of the first portion 31 and a downstream end
of the second portion 32 in the moving direction of the
contacting surface 30 (an upper direction in FIG. 9) is
referred to as a distance L.
15 Since the present invention has a technical concept
to improve reliability of removal of the spun yarn 10 from
the flyer 38 by providing the second portion 32 to be higher
than the first portion 31, an effect of the invention is
not sufficiently achieved if the distance L is excessively
20 small.
On the other hand, as described with reference to FIG.
7, when the spun yarn 10 is pushed upward by the first portion
31, the spun yarn 10 is moved from the first portion 31
towards the second portion 32 on the contacting surface 30
25 in some cases. From a viewpoint of smoothly moving the spun
yarn 10 from the first portion 31 towards the second portion
32, the distance L should not be excessively large.
The distance L is preferably not excessively small
nor excessively large. Based on consideration of the
30 inventor of the present invention, the distance L is
preferably at least 10 mm and at most 20 mm, and is preferably
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15 mm in particular. In the present embodiment, thus, the
distance L is 15 mm.
As described above, the yarn accumulating device 12
of the present embodiment includes the yarn accumulating
roller 21, the yarn hooking member 22, and the yarn 5 removal
lever 28. The yarn accumulating roller 21 is rotated under
the state in which the spun yarn 10 is wound around the
peripheral surface thereof. The yarn hooking member 22 is
capable of integrally rotating with the yarn accumulating
10 roller 21, and includes the flyer 38 capable of guiding the
spun yarn 10. The yarn removal lever 28 has the contacting
surface 30 capable of making contact with the spun yarn 10.
The yarn removal lever 28 is capable of moving the
contacting surface 30 between the standby position and the
15 yarn removal position and removes the spun yarn 10 from the
yarn hooking member 22 by moving the contacting surface 30
to the yarn removal position. The contacting surface 30
includes the first portion 31 and the second portion 32.
The first portion 31 is located upstream of the second
20 portion 32 in the moving direction of the contacting surface
30. Under the state in which the contacting surface 30 has
been moved to the yarn removal position, at least a portion
of the first portion 31 is located downstream of the
downstream end 21a of the yarn accumulating roller 21 in
25 the running direction of the spun yarn 10.
The first portion 31 and the second portion 32 are
located at different positions in the moving direction of
the contacting surface 30, and are arranged at the
contacting surface 30 of the yarn removal lever 28. Height
30 to which the spun yarn 10 is pushed upward thus can be
differed according to a position where the spun yarn 10
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makes contact with the contacting surface 30. Accordingly,
reliable yarn removal becomes possible. Furthermore, as
described above, by arranging at least a portion of the
first portion 31 to be located downstream of the downstream
end 21a of the yarn accumulating roller 21, the spun 5 n yarn
10 pushed upward by the first portion 31 can be prevented
from being wound around the yarn accumulating roller 21
again.
In the yarn accumulating device 12 of the present
10 embodiment, the first portion 31 and the second portion 32
are smoothly continuous at the contacting surface 30 of the
yarn removal lever 28.
Accordingly, the spun yarn 10 that has made contact
with the first portion 31 can be smoothly moved to the second
15 portion 32. Thus, when the spun yarn 10 is moved from the
first portion 31 towards the second portion 32 on the
contacting surface 30, behavior of the spun yarn 10 can be
prevented from becoming unstable.
In the yarn accumulating device 12 of the present
20 embodiment, the first portion 31 is arranged with respect
to the yarn non-removal region where the spun yarn 10 cannot
be removed from the yarn hooking member 22, and the second
portion 32 is arranged with respect to the yarn removal
region where the spun yarn 10 can be removed from the yarn
25 hooking member 22.
As described above, by arranging the first portion
31 with respect to the yarn non-removal region, a position
to which the spun yarn 10 is pushed upward can be set low
in the region where the spun yarn 10 cannot be removed.
30 Accordingly, the spun yarn 10 can be prevented from being
unnecessarily moved a large distance and thus becoming
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unstable, and a defect such as an entanglement of the spun
yarn 10 can be prevented. By arranging the second portion
32 with respect to the yarn removal region, the position
to which the spun yarn 10 is pushed upward can be set high
in the region where the spun yarn 10 can be rem5 oved.
Accordingly, the spun yarn 10 can be reliably removed from
the yarn hooking member 22.
In the yarn accumulating device 12 of the present
embodiment, the contacting surface 30 is arranged to not
10 make contact with the spun yarn 10 when located at the
standby position. The contacting surface 30 makes contact
with the spun yarn 10 by being moved from the standby
position to the yarn removal position.
By arranging the contacting surface 30 to not make
15 contact with the spun yarn 10 at the standby position, the
yarn removal lever 28 does not influence running of the spun
yarn 10. By moving the contacting surface 30 from the
standby position to the yarn removal position, the spun yarn
10 can be pushed upward by the contacting surface 30.
20 In the yarn accumulating device 12 of the present
embodiment, the distance L between the upstream end of the
first portion 31 and the downstream end of the second
portion 32 in the moving direction of the contacting surface
30 is 15 mm.
25 The spinning unit 2 of the present embodiment
includes the yarn accumulating device 12, the draft device
7 that supplies the fiber bundle 8, the spinning device 9
that applies twists to the fiber bundle 8 and to produce
the spun yarn 10, and the winding device 13 that winds the
30 spun yarn 10. The yarn accumulating device 12 temporarily
accumulates the spun yarn 10 between the spinning device
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9 and the winding device 13.
The fine spinning machine 1 of the present embodiment
includes a plurality of the spinning units 2 and the yarn
joining carrier 3 that travels among the plurality of the
spinning units 2. The yarn joining carrier 3 includes 5 the
drive source (the air pressure cylinder 49) that moves the
contacting surface 30 between the standby position and the
yarn removal position.
The preferred embodiment of the present invention has
10 been described, but the above-described configuration may
be modified as follows, for example.
In the above-described embodiment, since the yarn
removal lever 28 is formed of a metal plate member, the width
of the contacting surface 30 is constant. However, the yarn
15 removal lever 28 may be formed by an appropriate member
without being limited to the metal plate member. In this
case, the width of the contacting surface 30 is not required
to be constant.
A shape of a yarn removal member (the yarn removal
20 lever 28) is not limited to a shape illustrated in the
drawings. In the yarn removal member of the present
invention, in particular, a feature in which the contacting
surface 30 that makes contact with the spun yarn 10 includes
the first portion 31 and the second portion 32 that is
25 located higher than the first portion 31 is essential, and
shapes of the other portions are not limited and may be
appropriately modified.
In the above-described embodiment, the yarn removal
lever 28 is swung with the swing shaft 29 as a center. The
30 contacting surface 30 is thus moved in an arc shape.
However, the moving direction of the contacting surface 30
27 / 36
is not limited thereto, and the contacting surface 30 may
be moved in a linear manner, for example.
As illustrated in FIG. 4A, in the above-described
embodiment, the yarn accumulating roller 21 is driven and
rotated in a clockwise direction when seen from 5 downstream,
but may be driven and rotated in a counterclockwise
direction. However, in this case, a direction in which the
tip end 38a of the flyer 38 faces is opposite to a direction
of the tip end 38 illustrated in FIG. 4A. Thus, in this
10 case, the shape of the yarn removal lever 28 is also opposite
to a shape of the yarn removal lever 28 illustrated in FIG.
4A in a left-right direction.
The configuration of the spinning unit 2 may be
appropriately modified. For example, a pair of delivery
15 rollers adapted to transport the spun yarn 10 by being
rotationally driven with the spun yarn 10 therebetween may
be provided between the spinning device 9 and the yarn
accumulating device 12.
In the above described embodiment, the drive source
20 (the air pressure cylinder 49) that moves the contacting
surface 30 of the yarn removal lever 28 is provided to the
yarn joining carrier (the service carrier) 3, but the drive
source may be provided to each spinning unit 2 in place of
or in addition to such a configuration.
25 In the above-described embodiment, a service carrier
to which the drive source is provided is the yarn joining
carrier 3. However, the drive source may be provided to
another type of service carrier that travels among a
plurality of yarn winding units. For example, in place of
30 or in addition to the yarn joining carrier 3 of the
above-described embodiment, a doffing carrier may be
28 / 36
provided to a yarn winding machine, and the drive source
may be provided to the doffing carrier. The doffing carrier
is a service carrier adapted, when a package 45 is completed
in the winding device 13 of a certain yarn winding unit,
to remove the package 45 from the winding device 13 5 and to
supply a new (empty) bobbin 48 to the winding device 13.
A yarn accumulating device of the present invention
may be applied to another type of textile machine in which
a yarn is required to be temporarily accumulated, without
10 limited to a spinning unit.
A “yarn” accumulated by the yarn accumulating device
of the present invention is not limited to a spun yarn in
particular and widely includes a thread such as a rove, for
example.
15 The yarn joining carrier 3 and/or the doffing carrier
may be arranged in plurality in accordance with the number
of the spinning units 2.
According to an aspect of the present invention, a
yarn accumulating device includes a yarn accumulating
20 roller, a yarn hooking member, and a yarn removal member.
The yarn accumulating roller is arranged to rotate under
a state in which a yarn is wound around a peripheral surface
thereof. The yarn hooking member is arranged capable of
integrally rotating with the yarn accumulating roller and
25 adapted to guide the yarn. The yarn removal member has a
contacting surface arranged movable between a standby
position and a yarn removal position and adapted to be
capable of making contact with the yarn, and is adapted to
remove the yarn from the yarn hooking member by moving the
30 contacting surface to the yarn removal position. The
contacting surface includes a first portion and a second
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portion. In a direction in which the contacting surface
moves from the standby position towards the yarn removal
position, the first portion is located upstream of the
second portion. Under a state in which the contacting
surface has been moved to the yarn removal 5 position, at
least a portion of the first portion is located downstream
of the yarn accumulating roller in a running direction of
the yarn.
Since the first portion and the second portion
10 located at different positions in the direction in which
the contacting surface moves are arranged at the contacting
surface of the yarn removal member, a height to which the
yarn is pushed upward can be differed in accordance with
a position where the yarn makes contact with the contacting
15 surface. Accordingly, reliable yarn removal becomes
possible. By arranging the first portion to be located
downstream of the yarn accumulating roller in the running
direction of the yarn, the yarn pushed upward by the first
portion can be prevented from being wound around the yarn
20 accumulating roller.
In the yarn accumulating device, the first portion
and the second portion are preferably smoothly continuous
at the contacting surface of the yarn removal member.
Accordingly, the yarn that has made contact with the
25 first portion can be smoothly moved to the second portion.
Thus, when the yarn is moved from the first portion towards
the second portion on the contacting surface, behavior of
the yarn can be prevented from becoming unstable.
In the yarn accumulating device, the first portion
30 is arranged with respect to a yarn non-removal region where
the yarn cannot be removed from the yarn hooking member,
30 / 36
and the second portion is arranged with respect to a yarn
removal region where the yarn can be removed from the yarn
hooking member.
As described above, by arranging the first portion
with respect to the yarn non-removal region, a position 5 on to
which the yarn is pushed upward can be set low in a region
where the yarn cannot be removed. Accordingly, the yarn
can be prevented from being unnecessarily moved a long
distance and thus becoming unstable, and a defect such as
10 an entanglement of the yarn can be prevented. By arranging
the second portion with respect to the yarn removal region,
the position to which the yarn is pushed upward can be set
high in a region where the yarn can be removed. Accordingly,
the yarn can be reliably removed from the yarn hooking
15 member.
In the yarn accumulating device, the contacting
surface is arranged to not make contact with the yarn when
located at the standby position. The contacting surface
is adapted to make contact with the yarn by being moved from
20 the standby position to the yarn removal position.
By arranging the contacting surface to not make
contact with the yarn at the standby position, the yarn
removal member does not influence running of the yarn. The
contacting surface can push the yarn upward by being moved
25 from the standby position to the yarn removal position.
In the yarn accumulating device, in the direction in
which the contacting surface moves from the standby
position towards the yarn removal position, a distance
between an upstream end of the first portion and a
30 downstream end of the second portion is preferably at least
10 mm and at most 20 mm.
31 / 36
By setting a large distance between the first portion
and the second portion in the moving direction of the
contacting surface, reliability of yarn removal can be
improved. However, if the distance between the first
portion and the second portion is excessively large, 5 when
moving the yarn from the first portion to the second portion,
the yarn cannot be smoothly moved. The distance between
the first portion and the second portion in the moving
direction of the contacting surface is thus preferably
10 within the above-described range.
According to another aspect of the present invention,
a yarn winding unit includes the above-described yarn
accumulating device, a draft device adapted to supply a
fiber bundle, a spinning device adapted to apply twists to
15 the fiber bundle and to produce a spun yarn, and a winding
device adapted to wind the spun yarn. The yarn accumulating
device is adapted to temporarily accumulate the spun yarn
between the spinning device and the winding device.
Accordingly, the yarn accumulating device functions
20 as a kind of a buffer, and a defect (such as a yarn
slackening) in a case in which a spinning speed by the
spinning device and a winding speed by the winding device
do not correspond to each other for some reason can be
resolved. Thus, in the winding device, the spun yarn can
25 be stably wound.
According to further another aspect of the present
invention, a yarn winding machine includes a plurality of
the yarn winding units and a service carrier arranged to
travel among the plurality of the yarn winding units. The
30 service carrier includes a drive source adapted to move the
contacting surface between the standby position and the
32 / 36
yarn removal position.
By providing the drive source to the service carrier,
an individual drive source is not required to be provided
to each of the yarn winding units. Accordingly, the yarn
5 winding machine can be configured at low cost.
33 / 36
WE CLAIM:
1. A yarn accumulating device comprising:
a yarn accumulating roller arranged to rotate under
a state in which a running yarn is wound around a peripheral
surface 5 thereof;
a yarn hooking member arranged capable of integrally
rotating with the yarn accumulating roller and adapted to
guide the yarn; and
a yarn removal member having a contacting surface,
10 the contacting surface being arranged movable between a
standby position and a yarn removal position and being
adapted to be capable of making contact with the yarn, the
yarn removable member being adapted to remove the yarn from
the yarn hooking member by moving the contacting surface
15 to the yarn removal position,
wherein the contacting surface includes a first
portion and a second portion,
in a direction in which the contacting surface moves
from the standby position towards the yarn removal position,
20 the first portion is located upstream of the second portion,
and
under a state in which the contacting surface has been
moved to the yarn removal position, at least a portion of
the first portion is located downstream of the yarn
25 accumulating roller in a running direction of the yarn.
2. The yarn accumulating device according to claim
1, wherein the first portion and the second portion are
smoothly continuous at the contacting surface of the yarn
30 removal member.
34 / 36
3. The yarn accumulating device according to claim
1 or claim 2,
wherein the first portion is arranged with respect
to a yarn non-removal region where the yarn cannot be
removed from the yarn hooking member, 5 , and
the second portion is arranged with respect to a yarn
removal region where the yarn can be removed from the yarn
hooking member.
10 4. The yarn accumulating device according to any one
of claim 1 through claim 3, wherein the contacting surface
is arranged to not make contact with the yarn when located
at the standby position, and
the contacting surface is adapted to make contact
15 with the yarn by being moved from the standby position to
the yarn removal position.
5. The yarn accumulating device according to any one
of claim 1 through claim 4, wherein in the direction in which
20 the contacting surface moves from the standby position
towards the yarn removal position, a distance between an
upstream end of the first portion and a downstream end of
the second portion is at least 10 mm and at most 20 mm.
25 6. A yarn winding unit comprising:
the yarn accumulating device according to any one of
claim 1 through claim 5;
a draft device adapted to supply a fiber bundle;
a spinning device adapted to apply twists to the fiber
30 bundle and to produce a spun yarn; and
a winding device adapted to wind the spun yarn,
35 / 36
wherein the yarn accumulating device is adapted to
temporarily accumulate the spun yarn between the spinning
device and the winding device.
7. A yarn winding machine comprising5 :
a plurality of the yarn winding units according to
claim 6; and
a service carrier arranged to travel among the
plurality of the yarn winding units, the service carrier
10 including a drive source adapted to move the contacting
surface between the standby position and the yarn removal
position.