EP2573225B1

EP2573225B1 - Spinning unit and spinning machine

Info

Publication number: EP2573225B1
Application number: EP12180222.7A
Authority: EP
Inventors: Masaki Oka
Original assignee: Murata Machinery Ltd
Current assignee: Murata Machinery Ltd
Priority date: 2011-09-20
Filing date: 2012-08-13
Publication date: 2019-02-06
Anticipated expiration: 2032-08-13
Also published as: CN103014934A; CN103014934B; JP2013067873A; EP2573225A2; EP2573225A3

Description

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a spinning unit that forms a spun yarn and winds the spun yarn to form a package, and a spinning machine that includes a plurality of such spinning units.

2. Description of the Related Art

Spinning units known to the inventor (for example, Japanese Patent Application Laid-open No. 2010-174421 ) include a yarn supplying device that supplies a spun yarn, a winding device that winds the spun yarn to form a package, and a yarn pooling device that is arranged between the yarn supplying device and the winding device and that pools the spun yarn by winding the spun yarn on a yarn pooling roller.
DE 25 58 419 A1 discloses a spinning device wherein yarn is produced in a spinning compartment and withdrawn therefrom by yarn-withdrawal rollers and a winding device. A yarn storage device is interposed between the yarn-withdrawal rollers and the winding device. The yarn storage device includes a roller storage which is driven in a forward direction for accumulating a supply of yarn that is to be fed to the winding device. The roller storage can also be rotated in a reverse direction for withdrawing yarn therefrom during a piecing operation. A yarn gripper is provided for gripping the yarn upon a change in tension in the yarn.
EP 2 298 971 A1 teaches a spinning frame including a yarn accumulating roller. The yarn accumulating roller temporarily accumulates a spun yarn produced by a spinning device by winding the spun yarn around an outer peripheral surface thereof and rotating. A suction opening of a suction device is located near a base end of the yarn accumulating roller.
EP 2 354 069 A2 teaches a spinning machine including nozzles blowing fluid on a surface of a slack eliminating roller after a yarn is cut by a cutter.

SUMMARY OF THE INVENTION

The inventors recognized that, in the spinning unit such as the one mentioned above, if an end of the spun yarn moves to an unanticipated region of the yarn pooling roller when a breakage in the spun yarn occurs, smooth operation of the spinning unit thereafter is likely to be adversely affected.
It is an object of the present invention to provide a spinning unit that can operate smoothly by regulating movement of an end of a broken spun yarn, and a spinning machine that includes a plurality of such spinning units.
This object is achieved by a spinning unit according to claim 1.
A spinning machine according to an aspect includes a plurality of the above spinning units.
The above and other objects, features, advantages and the technical and industrial significance of this invention will be better understood by reading the following detailed description of presently preferred embodiments of the invention, when considered in connection with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a front view of a spinning machine according to an embodiment of the present invention;
FIG. 2 is a side view of a spinning unit according to an embodiment of the present invention;
FIG. 3 is a perspective view of a yarn pooling device of the spinning unit shown in FIG. 2;
FIG. 4 is a perspective view of the yarn pooling device during a yarn-defect detection operation;
FIG. 5 is a side view of the spinning unit during the yarn-defect detection operation;
FIG. 6 is another side view of the spinning unit during the yarn-defect detection operation;
FIG. 7 is a side view of the spinning unit when a breakage of a yarn has occurred;
FIG. 8 is a perspective view of the yarn pooling device when a breakage of a yarn has occurred;
FIG. 9 depicts a regulating member of the yarn pooling device shown in FIG. 3 from the side of a yarn pooling roller; and
FIG. 10 is a front view of the regulating member of the yarn pooling device shown in FIG. 3.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Exemplary embodiments of the present invention are explained in detail below with reference to the accompanying drawings. In the drawings, the parts that are identical or equivalent have been assigned the same reference numerals and the description thereof is not repeated.
As shown in FIG. 1, a spinning machine 1 includes a plurality of spinning units 2, a yarn joining carrier 3, a blower box 4, and a motor box 5. The spinning units 2 are arranged side-by-side, and each spinning unit 2 forms a spun yarn Y and winds the spun yarn Y to form a package P. The yarn joining carrier 3 performs a yarn joining operation in the spinning unit 2 where a breakage of the spun yarn Y has occurred. The blower box 4 houses an air supplying source, and suchlike, that produces a suction flow, a swirling airflow, etc., in various parts of the spinning unit 2. The motor box 5 houses a motor, and suchlike, that supplies power to various parts of the spinning unit 2.
In the following explanation, the term "upstream side" refers to the side where the spun yarn Y is formed and the term "downstream side" refers to the side where the spun yarn Y is wound in a route in which the spun yarn Y runs (that is, a yarn path). The term "front side" is used for the side relative to the yarn joining carrier 3 where the yarn path is present and the term "backside" is used for the opposite side relative to the yarn joining carrier 3.
As shown in FIGS. 1 and 2, each of the spinning units 2 includes, sequentially from the upstream side, a drafting device (yarn supplying device) 6, a spinning device (yarn supplying device) 7, a yarn clearer (yarn-defect detecting device) 8, a tension sensor (tension measuring device) 9, a yarn pooling device 50, a waxing device 11, and a winding device 12. Each of the devices mentioned above is supported directly or indirectly by or on a frame 13 in such a way that the upstream side is located above (that is, the downstream side is located below). The yarn clearer 8, the tension sensor 9, the yarn pooling device 50, and the waxing device 11 form a yarn processing module 80 that is detachably mounted on the frame 13.
The drafting device 6 drafts a sliver S to form a fiber bundle F (that is, drafts the fiber bundle F). The drafting device 6 includes a pair of back rollers 14, a pair of third rollers 15, a pair of middle rollers 17 with an apron belt 16 stretched over them, and a pair of front rollers 18. The bottom roller of each of the pairs of the rollers 14, 15, 17, and 18 is driven at different rotational speed by the power from the motor box 5 or a not shown electric motor arranged in each of the spinning units 2. Because of the rotation of the rollers 14, 15, 17, and 18, the drafting device 6 drafts the sliver S supplied from the upstream side to form the fiber bundle F, and supplies the fiber bundle F to the spinning device 7 located on the downstream side.
The spinning device 7 is an air spinning device that twists the fiber bundle F using a swirling airflow to form the spun yarn Y. More specifically, the spinning device 7 includes the following not shown components: a spinning chamber, a fiber guiding section, a swirling-airflow producing nozzle, and a hollow guide shaft. The fiber guiding section guides the fiber bundle F supplied from the drafting device 6 on the upstream side into the spinning chamber. The swirling-airflow producing nozzle is arranged in the periphery of the route in which the fiber bundle F runs and produces the swirling airflow inside the spinning chamber. The swirling airflow causes yarn ends of the fiber bundle F guided into the spinning chamber to be reversed and whirled. The hollow guide shaft guides the spun yarn Y from inside the spinning chamber to outside of the spinning device 7.
The yarn clearer 8 monitors the running spun yarn Y between the spinning device 7 and the yarn pooling device 50 for any yarn defect, and sends a yarn-defect detection signal to a unit controller 10 upon detection of the yarn defect. For example, an abnormality in a thickness of the spun yarn Y or a foreign matter that is included in the spun yarn Y is detected as a yarn defect by the yarn clearer 8. The tension sensor 9 measures a tension of the running spun yarn Y between the spinning device 7 and the yarn pooling device 50, and sends a tension signal indicative of the measured tension to the unit controller 10. The waxing device 11 applies wax to the running spun yarn Y between the yarn pooling device 50 and the winding device 12. One unit controller 10 is arranged in each of the spinning units 2 and controls operations of the spinning unit 2.
The yarn pooling device 50 pools the running spun yarn Y between the spinning device 7 and the winding device 12. The yarn pooling device 50 has functions of stably drawing the spun yarn Y from the spinning device 7, preventing the spun yarn Y from slacking by pooling the spun yarn Y that is coming out of the spinning device 7 during the yarn joining operation by the yarn joining carrier 3, and preventing any variation in the tension of the spun yarn Y on the winding device 12 side from being conveyed to the spinning device 7 side by appropriately controlling the tension on the spun yarn Y on the winding device 12 side.
The winding device 12 forms a fully wound package P by winding the spun yarn Y into a package P. The winding device 12 includes a cradle arm 21, a winding drum 22, and a traverse device 23. The cradle arm 21 is swingably supported by a support shaft 24. The cradle arm 21 causes a surface of a bobbin B, which is rotatably supported, or a surface of the package P (which is formed by winding the spun yarn Y on the bobbin B) to be in contact with a surface of the winding drum 22 with an appropriate pressure. The winding drum 22 is driven by the not shown electric motor included in each of the spinning units 2. As the winding drum 22 rotates, the bobbin B and/or the package P that is in contact with the winding drum 22 also rotates. The traverse device 23 is driven by a shaft 25 that is common to a plurality of the spinning units 2, and causes the spun yarn Y to traverse a predetermined width on the rotating bobbin B and/or the package P.
The yarn joining carrier 3 moves to the spinning unit 2 where a breakage of the spun yarn Y has occurred and performs the yarn joining operation at the particular spinning unit 2. The yarn joining carrier 3 includes a splicer (yarn joining device) 26, a suction pipe 27, and a suction mouth 28. The suction pipe 27 is pivotably supported by a support shaft 31. The suction pipe 27 holds the end of the spun yarn Y on the spinning device 7 side by suction and guides it to the splicer 26. The suction mouth 28 is pivotably supported by a support shaft 32. The suction mouth 28 holds the end of the spun yarn Y on the winding device 12 side by suction and guides it to the splicer 26. The splicer 26 joins two ends of the spun yarn Y that have been guided and brought together.
A structure of the yarn pooling device 50 is explained below. As shown in FIGS. 2 and 3, the yarn pooling device 50 includes a yarn pooling roller 51, an electric motor (driving motor) 55, a pooled-yarn-amount lower limit sensor 56, a pooled-yarn-amount upper limit sensor 57, a yarn hooking member 61, a yarn taking-off member 64, a suction mechanism 65, and a regulating member 71. A first guiding member 78 and a yarn-operation control member 75 are arranged sequentially from the upstream side between the spinning device 7 and the yarn pooling roller 51. A second guiding member 79 is arranged between the yarn pooling roller 51 and the winding device 12.
The yarn pooling roller 51 is fixed to a drive shaft of the electric motor 55 and is driven by the electric motor 55. The yarn pooling roller 51 includes a yarn pooling section 52, a base-end side tapering section 53, and a tip-end side tapering section 54. The yarn pooling section 52 is a cylindrical component around which the spun yarn Y is wound and tapers slightly towards the tip end. The base-end side tapering section 53 widens from a base end section 52a of the yarn pooling section 52 where winding starts towards the upstream side. The tip-end side tapering section 54 widens from a tip end section 52b of the yarn pooling section 52 towards the downstream side.
The base-end side tapering section 53 receives the spun yarn Y being guided from the upstream side to the yarn pooling roller 51 and smoothly guides it to the base end section 52a of the yarn pooling section 52. Thus, the spun yarn Y is wound systematically from the base end side to the tip end side of the yarn pooling section 52. The tip-end side tapering section 54 prevents the occurrence of a phenomenon known as sloughing in which multiple coils of the spun yarn Y wound around the yarn pooling section 52 comes off all at once when the spun yarn Y is unwound from the yarn pooling roller 51 and smoothly guides the spun yarn Y from the yarn pooling roller 51 to the downstream side.
The pooled-yarn-amount lower limit sensor 56 is a non-contact sensor that detects presence or absence of the spun yarn Y on the yarn pooling roller 51, and is arranged on the rear side of the yarn pooling roller 51 facing the yarn pooling section 52. The pooled-yarn-amount lower limit sensor 56 sends a pooled-amount lower limit detection signal to the unit controller 10 when an amount of the spun yarn Y wound around the yarn pooling roller 51 reaches a lower limit. The pooled-yarn-amount upper limit sensor 57 is a non-contact sensor that detects presence or absence of the spun yarn Y on the yarn pooling roller 51, and is arranged by the side of the yarn pooling roller 51 facing the tip end section 52b of the yarn pooling section 52. The pooled-yarn-amount upper limit sensor 57 sends a pooled-amount upper limit detection signal to the unit controller 10 when an amount of the spun yarn Y wound around the yarn pooling roller 51 reaches an upper limit.
The yarn hooking member 61 is arranged on the winding device 12 side with respect to the yarn pooling roller 51, and engages with the spun yarn Y and winds it around the yarn pooling roller 51. The yarn hooking member 61 includes a flier shaft 62 and a flier 63. The flier shaft 62 is supported on the tip end side of the yarn pooling roller 51 so as to rotate relative to and coaxially with the yarn pooling roller 51. The flier 63 is fixed to the tip end of the flier shaft 62 and is bent over the tip-end side tapering section 54 of the yarn pooling roller 51 so as to be able to engage with the spun yarn Y. A magnetic force is caused to act between the yarn pooling roller 51 and the flier shaft 62. In order for the yarn hooking member 61 to rotate relative to the yarn pooling roller 51, the yarn hooking member 61 produces a torque greater than or equal to a predetermined value.
The yarn taking-off member 64 takes off the spun yarn Y from the yarn hooking member 61, and is arranged near the tip-end side tapering section 54 of the yarn pooling roller 51. The yarn taking-off member 64 is supported so as to be swingable between a descent position and an ascent position. The descent position is a position that is retracted from the yarn path. The ascent position is a position at which the spun yarn Y is pushed up in the yarn path and taken off from the yarn hooking member 61. The yarn taking-off member 64 is normally biased to be in the descent position side by a not shown spring. However, during the yarn joining operation, and suchlike, the yarn taking-off member 64 is moved to the ascent position by a not shown air pressure cylinder provided in the yarn joining carrier 3.
The suction mechanism 65 produces a suction airflow in a suction vent 66a arranged facing the base-end side tapering section 53 of the yarn pooling roller 51. The suction vent 66a is provided at one end of a pipe-shaped member 66. The other end of the pipe-shaped member 66 is connected via a not shown pipe to a not shown fiber-waste collecting chamber, which is common to the suction pipe 27, and the suction mouth 28. As explained later, when a breakage of the spun yarn Y occurs on the spinning device 7 side, the end of the spun yarn Y sways about on the base end section 52a side of the yarn pooling section 52. The swaying yarn end is subjected to the action of the suction airflow produced at the suction vent 66a. Thus, most fiber waste from the yarn end is removed by the suction mechanism 65 and is prevented from being scattered.
The regulating member 71 is a plate member that is arranged beside the yarn pooling roller 51 (facing the yarn pooling section 52), and includes a first regulating portion 72, a second regulating portion 73, and a third regulating portion 74. The first regulating portion 72 and the second regulating portion 73 regulate the movement of the end of the spun yarn Y that sways about on the base end section 52a side of the yarn pooling section 52 when a breakage of the spun yarn Y occurs on the spinning device 7 side, such that the swaying end of the spun yarn Y is prevented from moving to the tip end section 52b side of the yarn pooling section 52 before the spun yarn Y is orderly unwound from the tip end section 52b of the yarn pooling section 52. The third regulating portion 74 regulates the movement of the end of the spun yarn Y that sways about on the tip end section 52b side of the yarn pooling section 52 when a breakage of the spun yarn Y occurs on the winding device 12 side, such that the swaying end of the spun yarn Y is prevented from moving to the base end section 52a side of the yarn pooling section 52 before the spun yarn Y is orderly unwound from the base end section 52a of the yarn pooling section 52.
The yarn-operation control member 75 is a plate member mounted at the upstream of the yarn pooling roller 51 (in the present embodiment, on the bottom surface (end face on the downstream side) of the tension sensor 9), and includes a guiding component 76 and a regulating component 77. The guiding component 76 applies tension to the spun yarn Y and guides the spun yarn Y to the base-end side tapering section 53 of the yarn pooling roller 51, and prevents the twisting of the spun yarn Y coming from the spinning device 7 from being conveyed further downstream of the guiding component 76. When there is a breakage of the spun yarn Y on the spinning device 7 side, the regulating component 77 prevents the end of the spun yarn Y from being displaced from the yarn path of the spun yarn Y guided to the yarn pooling device 50 and from moving to the yarn hooking member 61 side by passing over the yarn pooling roller 51.
The first guiding member 78 is a plate member mounted at the upstream of the yarn pooling roller 51 (in the present embodiment, on the bottom surface (end face on the downstream side) of the tension sensor 9), and guides the spun yarn Y from a slit formed on a casing of the tension sensor 9 to a designated detection position inside the casing. The second guiding member 79 is a plate member mounted downstream of the yarn pooling roller 51 (in the present embodiment, on a module frame 81 of the yarn processing module 80). The second guiding member 79 guides the spun yarn Y to a designated position of the waxing device 11 and regulates a track of the spun yarn Y being swayed about by the rotating yarn hooking member 61, stabilizing the running of the spun yarn Y further downstream of the second guiding member 79.
An operation of the yarn pooling device 50 is explained below. When the spinning unit 2 is operating normally by forming the spun yarn Y and winding the spun yarn Y to form the package P, the electric motor 55 drives the yarn pooling roller 51 at a substantially constant rotational speed. The yarn hooking member 61 integrally rotates with the yarn pooling roller 51, and the flier 63 engages with the spun yarn Y. The yarn hooking member 61, which is rotating with the spun yarn Y engaged thereon, winds the spun yarn Y around the rotating yarn pooling roller 51.
Once the spun yarn Y is wound around the yarn pooling roller 51, the unit controller 10 exerts control over the operation of the spinning unit 2. The unit controller 10 exerts this control based on the pooled-amount lower limit detection signal received from the pooled-yarn-amount lower limit sensor 56 and the pooled-amount upper limit detection signal received from the pooled-yarn-amount upper limit sensor 57, so that the pooled amount of the spun yarn Y that is wound around the yarn pooling roller 51 is greater than or equal to the lower limit and less than or equal to the upper limit. When the pooled amount of the spun yarn Y wound around the yarn pooling roller 51 is greater than or equal to the lower limit, the surface area of a contact between the yarn pooling section 52 of the yarn pooling roller 51 and the spun yarn Y increases. Consequently, there is almost no slippage, and suchlike, between the yarn pooling section 52 and the spun yarn Y. Therefore, the yarn pooling device 50 can draw the spun yarn Y stably (that is, while maintaining a substantially constant quality and speed) from the spinning device 7 by the rotation of the yarn pooling roller 51.
When the tension on the spun yarn Y on the winding device 12 side increases in the state where the spun yarn Y is wound around the yarn pooling roller 51, a force that causes the yarn hooking member 61 to rotate relative to the yarn pooling roller 51 (that is, a force that causes the rotation of the yarn hooking member 61 to stop) acts on the flier 63. When the torque produced in the yarn hooking member 61 increases to a value greater than or equal to a predetermined value as a consequence of the force, the yarn hooking member 61 rotates relative to the yarn pooling roller 51. Consequently, the spun yarn Y is unwound from the yarn pooling roller 51. When the tension on the spun yarn Y on the winding device 12 side decreases and the torque produced in the yarn hooking member 61 reduces to less than the predetermined value, the yarn hooking member 61 rotates integrally with the yarn pooling roller 51. Consequently, the spun yarn Y is wound around the yarn pooling roller 51. In this manner, the yarn pooling device 50 adjusts the tension on the spun yarn Y on the winding device 12 side and thereby prevents the variation in the tension on the spun yarn Y that occurs on the winding device 12 side from being conveyed to the spinning device 7 side.
An operation of the spinning unit 2 during a yarn-defect detection operation is explained below. When the yarn clearer 8 detects a defect while the spinning unit 2 is operating normally by forming the spun yarn Y and winding the spun yarn Y to form the package P, the yarn clearer 8 sends the yarn-defect detection signal to the unit controller 10. The unit controller 10 stops the operation of the drafting device 6, the spinning device 7, etc., immediately upon receiving the yarn-defect detection signal. Consequently, the fiber bundle F is not subjected to twisting, and the spun yarn Y is cut on the spinning device 7 side.
Even if the spun yarn Y is cut on the spinning device 7 side, the unit controller 10 causes the rotation of the yarn pooling roller 51 and the winding by the winding device 12 to be continued. Consequently, as shown in FIG. 4, the cut end of the spun yarn Y is wound around the yarn pooling roller 51. While the spun yarn Y is unwound from the yarn pooling roller 51 to the winding device 12, the cut end of the spun yarn Y sways about on the base end section 52a side of the yarn pooling section 52. The swaying yarn end is prevented from moving to the tip end section 52b of the yarn pooling section 52 by the first regulating portion 72 of the regulating member 71, and is subjected to the suction airflow produced by the suction vent 66a. Consequently, the spun yarn Y is smoothly unwound from the yarn pooling roller 51 to the winding device 12 side. In addition, while the unwinding of the spun yarn Y is taking place, the fiber waste from the yarn end on the upstream side is removed by the suction mechanism 65 and is prevented from being scattered.
When the winding device 12 winds the spun yarn Y up to the cut end into the package P, the unit controller 10 sends a control signal that specifies the spinning unit 2 in which the spun yarn Y has been cut to the yarn joining carrier 3. Consequently, the yarn joining carrier 3 moves to a position in front of the specified spinning unit 2, and commences the yarn joining operation.
As shown in FIG. 5, the suction mouth 28 turns to a position near the surface of the package P and produces the suction airflow while the winding device 12 causes a reverse rotation of the package P. Consequently, the suction mouth 28 draws and holds by suction the end of the spun yarn Y from the surface of the package P. Thereafter, as shown in FIG. 6, the suction mouth 28 turns to its original position (standby position) and guides the end of the spun yarn Y on the winding device 12 side into the splicer 26. The winding device 12 stops the rotation of the package P.
As shown in FIG. 5, the suction pipe 27 pivots to a position at the downstream of the spinning device 7 and produces the suction airflow. Because during this operation the unit controller 10 restarts the operations of the drafting device 6, the spinning device 7, etc., the suction pipe 27 holds the end of the spun yarn Y that is formed. Thereafter, as shown in FIG. 6, the suction pipe 27 pivots to the original position (standby position), and guides the end of the spun yarn Y on the spinning device 7 side to the splicer 26.
When the end of the spun yarn Y on the winding device 12 side and the end of the spun yarn Y on the spinning device 7 side are guided into the splicer 26, the yarn hooking member 61 in the yarn pooling device 50 engages with the spun yarn Y on the spinning device 7 side and winds the spun yarn Y around the yarn pooling roller 51 with which the yarn hooking member 61 is integrally rotating. Consequently, almost no slack occurs in the spun yarn Y coming out of the spinning device 7, even if the winding by the winding device 12 is stopped. Thus, during the yarn joining operation, etc., by the yarn joining carrier 3, the yarn pooling device 50 pools the spun yarn Y coming out of the spinning device 7, thereby preventing the spun yarn Y from slacking.
When the pooled amount of the spun yarn Y wound around the yarn pooling roller 51 reaches the lower limit, almost no slippage, and suchlike, takes place between the yarn pooling section 52 of the yarn pooling roller 51 and the spun yarn Y. Consequently, the spun yarn Y is drawn stably (that is, while maintaining a substantially constant quality and speed) from the spinning device 7. The unit controller 10 causes the yarn taking-off member 64 to move from the descent position to the ascent position where the yarn taking-off member 64 take off the spun yarn Y from the yarn hooking member 61.
When the spun yarn Y is taken off from the yarn hooking member 61 while the yarn pooling roller 51 is rotating as described above, there is almost no resistance to prevent the unwinding of the spun yarn Y from the yarn pooling roller 51. Consequently, the spun yarn Y that is wound around the yarn pooling roller 51 before the pooled amount of the spun yarn Y reaches the lower limit (that is, the spun yarn Y with an unstable quality) is unwound from the yarn pooling roller 51 and sucked into the suction pipe 27. Even when the spun yarn Y is being sucked into the suction pipe 27, the spun yarn Y is stably drawn from the spinning device 7 and wound around the yarn pooling roller 51. As a result, an amount of the pooled spun yarn Y that is greater than or equal to the lower limit can be attained.
Once the spun yarn Y with an unstable quality is removed by the suction pipe 27, the unit controller 10 causes the yarn taking-off member 64 to move from the ascent position to the descent position. Consequently, the spun yarn Y on the spinning device 7 side is engaged by the yarn hooking member 61, and no unwinding of the spun yarn Y at the downstream of the yarn pooling roller 51 occurs. The splicer 26 joins the end of the spun yarn Y on the winding device 12 side and the end of the spun yarn Y on the spinning device 7 side. Unnecessary yarn ends cut by the splicer 26 are removed by the suction pipe 27 and the suction mouth 28. Once the yarn joining operation by the splicer 26 is completed, the unit controller 10 causes the winding operation by the winding device 12 to restart.
An operation of the spinning unit 2 when a breakage of the spun yarn Y has occurred is explained next. As shown in FIG. 7, when the spinning unit 2 is operating normally by forming the spun yarn Y and winding the spun yarn Y to form the package P, if a breakage in the spun yarn Y occurs further downstream of the yarn pooling device 50, no spun yarn Y is detected by a not shown yarn detecting sensor arranged at the downstream of the yarn pooling device 50. Based on this, the unit controller 10 judges that a breakage of the spun yarn Y has occurred between the yarn pooling device 50 and the winding device 12, and immediately stops the operations of the drafting device 6, the spinning device 7, etc. Consequently, the fiber bundle F is not subjected to twisting and the spun yarn Y is cut on the spinning device 7 side as well.
Even if the spun yarn Y is cut on the spinning device 7 side, the unit controller 10 causes the rotation of the yarn pooling roller 51 and the winding by the winding device 12 to be continued. Consequently, the cut end of the spun yarn Y is wound around the yarn pooling roller 51 and sways about on the base end section 52a side of the yarn pooling section 52. The yarn end is prevented from moving to the tip end section 52b side of the yarn pooling section 52 by the first regulating portion 72 of the regulating member 71, and is subjected to the suction airflow produced by the suction vent 66a. Consequently, the fiber waste from the yarn end on the upstream side is removed by the suction mechanism 65 and is prevented from being scattered.
Because the spun yarn Y that is wound around the yarn pooling roller 51 is cut on the downstream side as well, the spun yarn Y is not unwound from the yarn pooling roller 51 towards the downstream side. Consequently, the unit controller 10 causes the yarn pooling roller 51 to stop positive rotation (rotation in the normal direction) and start reverse rotation. The upstream end of the spun yarn Y wound around the yarn pooling roller 51 is prevented from moving to the tip end section 52b side of the yarn pooling section 52 by the second regulating portion 73 of the regulating member 71. Consequently, as shown in FIG. 8, the upstream yarn end is reliably held by suction by the suction vent 66a of the suction mechanism 65. Furthermore, the downstream end of the spun yarn Y wound around the yarn pooling roller 51 is prevented from moving to the base end section 52a side of the yarn pooling section 52 by the third regulating portion 74 of the regulating member 71. Therefore, the spun yarn Y wound around the yarn pooling roller 51 is smoothly unwound from the base end section 52a side of the yarn pooling section 52 and sucked in by the suction mechanism 65.
Once the spun yarn Y wound around the yarn pooling roller 51 is removed by the suction mechanism 65, the unit controller 10 causes the yarn pooling roller 51 to stop the reverse rotation and start the positive rotation. The unit controller 10 sends a control signal that specifies the spinning unit 2 in which the spun yarn Y has been cut to the yarn joining carrier 3. Consequently, the yarn joining carrier 3 moves to a position in front of the specified spinning unit 2, and performs the yarn joining operation.
A structure of the regulating member 71 of the yarn pooling device 50 is explained next in further detail. As shown in FIGS. 9 and 10, the first regulating portion 72, the second regulating portion 73, and the third regulating portion 74 of the regulating member 71 are integrally formed as parts of a rectangular plate member 70 made of, for example, metal. An upper edge 70a of the plate member 70 has a notch 70b. The suction vent 66a of the suction mechanism 65 faces the base-end side tapering section 53 of the yarn pooling roller 51 via the notch 70b. A lower edge 70c of the plate member 70 is bent toward the side opposite to that of the yarn pooling roller 51. The pooled-yarn-amount upper limit sensor 57 is mounted on the underside of the lower edge 70c.
The first regulating portion 72 is located at the upstream of the notch 70b in a rotation direction A of the yarn pooling roller 51 during the winding of the spun yarn Y, that is, at the upstream of the suction vent 66a in the rotation direction A. The first regulating portion 72 is arranged facing the base end section 52a of the yarn pooling section 52. The first regulating portion 72 regulates the movement of the end of the spun yarn Y that sways about on the base end section 52a side of the yarn pooling section 52 when a breakage of the spun yarn Y occurs on the spinning device 7 side, such that the swaying end of the spun yarn Y is prevented from moving to the tip end section 52b side of the yarn pooling section 52 before the spun yarn Y is orderly unwound from the tip end section 52b of the yarn pooling section 52.
The second regulating portion 73 is located downstream of the notch 70b in the rotation direction A of the yarn pooling roller 51 during the winding of the spun yarn Y, that is, at the downstream of the suction vent 66a in the rotation direction A. The second regulating portion 73 is arranged facing the base end section 52a of the yarn pooling section 52. The second regulating portion 73 regulates the movement of the end of the spun yarn Y that sways about on the base end section 52a side of the yarn pooling section 52 when a breakage of the spun yarn Y occurs on the spinning device 7 side, such that the swaying end of the spun yarn Y is prevented from moving to the tip end section 52b side of the yarn pooling section 52 before the spun yarn Y is orderly unwound from the tip end section 52b of the yarn pooling section 52.
The location of the first regulating portion 72 at the upstream of the suction vent 66a in the rotation direction A implies that a distance from the suction vent 66a to the first regulating portion 72 is shorter when the yarn pooling roller 51 rotates in the direction opposite to the rotation direction A compared to when the yarn pooling roller 51 rotates in the rotation direction A. Similarly, the location of the second regulating portion 73 at the downstream of the suction vent 66a in the rotation direction A implies that the distance from the suction vent 66a to the second regulating portion 73 is shorter when the yarn pooling roller 51 rotates in the rotation direction A compared to when the yarn pooling roller 51 rotates in the direction opposite to the rotation direction A.
The third regulating portion 74 is located below the notch 70b (on the tip end section 52b side), that is, below the suction vent 66a (on the tip end section 52b side) and arranged facing the yarn pooling section 52. The third regulating portion 74 regulates the movement of the end of the spun yarn Y that sways about on the tip end section 52b side of the yarn pooling section 52 when a breakage of the spun yarn Y occurs on the winding device 12 side, such that the swaying end of the spun yarn Y is prevented from moving to the base end section 52a side of the yarn pooling section 52 before the spun yarn Y is orderly unwound from the base end section 52a of the yarn pooling section 52. The third regulating portion 74 is a part of the plate member 70 that is formed into a convex portion protruding towards the yarn pooling section 52 side. The third regulating portion 74 extends substantially parallel to a center line of rotation of the yarn pooling roller 51 along the yarn pooling section 52.
As explained above, in the spinning unit 2, the swaying end of the spun yarn Y on the base end section 52a side of the yarn pooling section 52 when a breakage in the spun yarn Y occurs on the spinning device 7 side (that is, on the side from where the spun yarn Y is guided-in to the yarn pooling roller 51) during yarn defect detection, etc., is prevented from moving to the tip end section 52b side of the yarn pooling section 52 by the first regulating portion 72 and the second regulating portion 73. Consequently, hindrance to a smooth unwinding of the spun yarn Y from the tip end section 52b side of the yarn pooling section 52 due to the entwining of the end of the spun yarn Y on the upstream side with the spun yarn Y wound on the tip end section 52b side of the yarn pooling section 52 is prevented.
Furthermore, when the yarn pooling roller 51 is reverse-rotated so as to unwind the spun yarn Y from the base end section 52a side of the yarn pooling section 52, the swaying end of the spun yarn Y on the tip end section 52b side of the yarn pooling section 52 when a breakage of the spun yarn Y occurs on the winding device 12 side (that is, on the side from where the spun yarn Y is guided-out from the yarn pooling roller 51) is prevented from moving to the base end section 52a side of the yarn pooling section 52 by the third regulating portion 74 that extends substantially parallel to the center line of rotation of the yarn pooling roller 51 along the yarn pooling section 52. Consequently, hindrance to a smooth unwinding of the spun yarn Y from the base end section 52a side of the yarn pooling section 52 due to the entwining of the end of the spun yarn Y on the downstream side with the spun yarn Y wound on the base end section 52a side of the yarn pooling section 52 is prevented.
Thus, in the spinning unit 2, a smooth operation is realized by regulating the movement of the ends of the broken spun yarn Y.
The first regulating portion 72 is located at the upstream of the suction vent 66a of the suction mechanism 65 and the second regulating portion 73 is located downstream of the suction vent 66a of the suction mechanism 65 in the normal rotation direction of the yarn pooling roller 51. Consequently, because the end of the spun yarn Y that is swaying about on the base end section 52a side of the yarn pooling section 52 is subjected to the action of the suction airflow, the fiber waste at the end of the spun yarn Y can be reliably removed. Furthermore, the end of the spun yarn Y can be prevented from entangling around the suction vent 66a.
The first regulating portion 72, the second regulating portion 73, and the third regulating portion 74 are integrally formed as parts of the plate member 70. Consequently, the number of parts required in the yarn pooling device 50 for providing the first regulating portion 72, the second regulating portion 73, and the third regulating portion 74 can be reduced, and simplification of the structure can be realized.
One part of the plate member 70 that forms a convex portion protruding towards the yarn pooling section 52 side serves as the third regulating portion 74. Consequently, a narrower gap that needs to be maintained between the surface of the yarn pooling section 52 and the third regulating portion 74 can be easily and reliably ensured.
The pooled-yarn-amount upper limit sensor 57 is mounted on the plate member 70. Consequently, the number of parts required for supporting the pooled-yarn-amount upper limit sensor 57 can be reduced, and simplification of the structure can be realized.
The yarn supplying device that supplies the spun yarn Y includes the drafting device 6 and the spinning device 7. The spinning device 7 is an air spinning device that forms the spun yarn Y by twisting the fiber bundle F using a swirling airflow. Consequently, a high quality spun yarn Y can be efficiently supplied.
Because the spinning machine 1 includes a plurality of the spinning units 2 that can operate smoothly as explained above even when a breakage occurs in the spun yarn Y, a high quality package P is efficiently formed.
Assuming that the spinning device is an air spinning device, a needle that is held by a fiber guiding section to project into the spinning chamber can be further provided to prevent the twisting of the fiber bundle to be conveyed upstream of the spinning device. The twisting of the fiber bundle can be prevented from being conveyed upstream of the spinning device by a downstream end of a fiber guiding section instead of by the needle. Alternatively, the spinning device can include a pair of air-jet nozzles that produce airflows in mutually opposite directions, and can thus spin the fiber bundle in opposite directions at the same time.
In the spinning machine 1 and the spinning unit 2, the yarn pooling device 50 has a function of drawing the spun yarn Y from the spinning device 7.
In the spinning machine 1 and the spinning unit 2, the spun yarn Y is cut by a stoppage of the swirling airflow in the spinning device 7 during the yarn-defect detection operation. Alternatively, in the spinning machine and the spinning unit according to the present invention, the spun yarn can be cut by a cutter during the yarn-defect detection operation.
In the spinning machine 1 and the spinning unit 2, the devices are arranged so that the spun yarn Y supplied from above is wound below. Alternatively, the devices can be arranged so that the spun yarn supplied from below is wound above.
In the spinning machine 1 and the spinning unit 2, the bottom rollers of the drafting device 6 and a traverse mechanism of the traverse device 23 are driven by the power of the motor box 5 (that is, concurrently driven in a plurality of the spinning units 2). Alternatively, each section (for example, the drafting device, the spinning device, the winding device, etc.) of the spinning unit can be driven independently in each spinning unit 2.
The tension sensor 9 can be arranged at the upstream of the yarn clearer 8 in the running direction of the spun yarn Y. A common unit controller 10 can be provided for a plurality of the spinning units 2 instead of one unit controller 10 per spinning unit 2. The waxing device 11, the tension sensor 9, and the yarn clearer 8 need not be provided in the spinning unit 2. The winding device 12 can be driven by a common drive source provided for a plurality of the spinning units 2 instead of by a separate driving motor provided for each spinning unit 2. In this case, during the reverse rotation of the package P, the cradle arm 21 is moved by a not shown air cylinder so that the package P is separated from the winding drum 22, and thereafter the package P is reverse-rotated by a not shown reverse roller provided in the yarn joining carrier 3. Instead of providing the yarn processing module 80, the yarn clearer 8, the tension sensor 9, the yarn pooling device 50, and the waxing device 11 can be mounted individually on the frame 13 directly or indirectly.
A spinning unit according to an aspect of the present invention includes a yarn supplying device that supplies a spun yarn, a winding device that winds the spun yarn to form a package, and a yarn pooling device that pools the spun yarn between the yarn supplying device and the winding device. The yarn pooling device includes a yarn pooling roller around which the spun yarn is wound, and a first regulating portion. The first regulating portion is arranged facing a base end section on a winding start side of a yarn pooling section where the spun yarn is wound around the yarn pooling roller. The first regulating portion regulates a movement of an end of the spun yarn that sways about on the base end section side when a breakage of the spun yarn occurs on the yarn supplying device side, such that the swaying end of the spun yarn is prevented from moving to a tip end section side before the spun yarn is orderly unwound from the tip end section side of the yarn pooling section.
In the spinning unit according to claim 1, the first regulating portion prevents the swaying end of the spun yarn on the base end section side of the yarn pooling section when a breakage of the spun yarn occurs on the yarn supplying device side from moving to the tip end section side of the yarn pooling section. Consequently, hindrance to a smooth unwinding of the spun yarn from the tip end section side of the yarn pooling section due to the entwining of the end of the spun yarn with the spun yarn wound on the tip end section side of the yarn pooling section is prevented. Thus, a smooth operation is realized by the spinning machine by regulating the end of the spun yarn in which breakage has occurred.
The yarn pooling device further includes a suction mechanism that generates a suction airflow at a suction vent arranged facing the yarn pooling roller. The suction vent can be located downstream of the first regulating portion with respect to a rotation direction of the yarn pooling roller during the winding of the spun yarn. Consequently, because the end of the spun yarn that is swaying about on the base end section side of the yarn pooling section is subjected to the action of the suction airflow, fiber waste at the end of the spun yarn can be reliably removed. Furthermore, the end of the spun yarn can be prevented from entangling around the suction vent.
The yarn pooling device further includes a second regulating portion. The second regulating portion is arranged facing the base end section of the yarn pooling section. The second regulating portion regulates a movement of the end of the spun yarn that sways about on the base end section side when a breakage of the spun yarn occurs on the yarn supplying device side, such that the swaying end of the spun yarn is prevented from moving to the tip end section side before the spun yarn is orderly unwound from the tip end section side. The second regulating portion is located downstream of the suction vent with respect to the rotation direction of the yarn pooling roller during the winding of the spun yarn. Consequently, because the end of the spun yarn that is swaying about on the base end section side of the yarn pooling section is subjected to the action of the suction airflow, fiber waste at the end of the spun yarn can be removed even more reliably. Furthermore, the end of the spun yarn can be more definitively prevented from entangling around the suction vent.
The yarn pooling device can further include a third regulating portion. The third regulating portion is arranged facing the yarn pooling section. The third regulating portion regulates a movement of the end of the spun yarn that sways about on the tip end section side when a breakage of the spun yarn occurs on the winding device side, such that the swaying end of the spun yarn is prevented from moving to the base end section side before the spun yarn is orderly unwound from the base end section side. When the yarn pooling roller is rotated so as to unwind the spun yarn from the base end section side of the yarn pooling section, the swaying end of the spun yarn on the tip end section side of the yarn pooling section when a breakage in the spun yarn occurs on the winding device side is prevented from moving to the base end section side of the yarn pooling section by the third regulating portion. Consequently, hindrance to a smooth unwinding of the spun yarn from the base end section side of the yarn pooling section due to the entwining of the end of the spun yarn with the spun yarn wound on the base end section side of the yarn pooling section is prevented.
The third regulating portion can extend substantially parallel to a center line of rotation of the yarn pooling roller along a surface of the yarn pooling section. Consequently, hindrance to a smooth unwinding of the spun yarn from the base end section side of the yarn pooling section due to the entwining of the end of the spun yarn with the spun yarn wound on the base end section side of the yarn pooling section is even more reliably prevented.
The first regulating portion, the second regulating portion, and the third regulating portion can be integrally formed as parts of a plate member. Consequently, the number of parts required for providing the first regulating portion, the second regulating portion, and the third regulating portion can be reduced, and simplification of the structure can be realized.
The third regulating portion can be a part of the plate member that is formed into a convex portion protruding towards the yarn pooling section side. Consequently, a narrower gap that needs to be maintained between the surface of the yarn pooling section and the third regulating portion can be easily and reliably ensured.
The yarn pooling device can further include a pooled-yarn amount sensor that detects a pooled amount of the spun yarn wound around the yarn pooling roller and the pooled-yarn amount sensor can be mounted on the plate member. Consequently, the number of parts required for supporting the pooled-yarn amount sensor can be reduced, and simplification of the structure can be realized.
The yarn supplying device includes a drafting device that drafts a fiber bundle and a spinning device that forms the spun yarn by twisting the fiber bundle. Consequently, a high quality spun yarn can be efficiently supplied.
The spinning device can be an air spinning device that forms the spun yarn by twisting the fiber bundle using a swirling airflow. Consequently, a high quality spun yarn can be efficiently supplied.
A spinning machine according to another aspect of the present invention includes a plurality of the above-explained spinning units. Because the spinning machine includes the spinning units that can operate smoothly as explained above even when a breakage occurs in the spun yarn, a high quality package is efficiently formed.
Although the invention has been described with respect to specific embodiments for a complete and clear disclosure, the appended claims are not to be thus limited but are to be construed as embodying all modifications and alternative constructions that may occur to one skilled in the art that fairly fall within the basic teaching herein set forth.

Claims

A spinning unit comprising:
a yarn supplying device (6, 7) adapted to supply a spun yarn (Y) and comprising a drafting device (6) adapted to draft a fiber bundle (F) and a spinning device (7) adapted to form the spun yarn (Y) by twisting the fiber bundle (F);

a winding device (12) adapted to wind the spun yarn (Y) to form a package (P); and

a yarn pooling device (50) adapted to pool the spun yarn (Y) between the yarn supplying device (6, 7) and the winding device (12),

wherein the yarn pooling device (50) includes
a yarn pooling roller (51) adapted to be wound around with the spun yarn (Y),

a first regulating portion (72) that is arranged facing a base end section (52a) on a winding start side of a yarn pooling section (52) where the spun yarn (Y) is wound around the yarn pooling roller (51), and adapted to regulate a movement of an end of the spun yarn (Y) that sways about on the base end section (52a) side when a breakage of the spun yarn (Y) occurs on the yarn supplying device (6, 7) side and while the yarn pooling device continues to rotate in the same rotation direction (A) as during the winding by the winding device, to prevent the swaying end of the spun yarn (Y) from moving to a tip end section (52b) side of the yarn pooling section (52) before the spun yarn (Y) is orderly unwound from the tip end section (52b) side,

a suction mechanism (65) adapted to generate a suction airflow at a suction vent (66a) that is arranged facing the yarn pooling roller (51), wherein the suction vent (66a) is located downstream of the first regulating portion (72) with respect to the rotation direction (A) of the yarn pooling roller (51) during the winding of the spun yarn (Y) by the winding device (12), and

a second regulating portion (73) that is arranged facing the base end section (52a) and adapted to regulate a movement of the end of the spun yarn (Y) that sways about on the base end section (52a) side when a breakage of the spun yarn (Y) occurs on the yarn supplying device (6, 7) side and while the yarn pooling device rotates in a reverse direction as during the winding by the winding device, to prevent the swaying end of the spun yarn (Y) from moving to the tip end section (52b) side of the yarn pooling section (52) before the spun yarn (Y) is orderly unwound from the tip end section (52b) side, wherein the second regulating portion (73) is located downstream of the suction vent (66a) with respect to the rotation direction (A) of the yarn pooling roller (51) during the winding of the spun yarn (Y) by the winding device (12).
The spinning unit according to Claim 1, wherein the yarn pooling device (50) further includes a third regulating portion (74) that is arranged facing the yarn pooling section (52), and adapted to regulate a movement of the end of the spun yarn (Y) that sways about on the tip end section (52b) side when a breakage of the spun yarn (Y) occurs on the winding device (12) side, to prevent the swaying end of the spun yarn (Y) from moving to the base end section (52a) side before the spun yarn (Y) is orderly unwound from the base end section (52a) side.
The spinning unit according to Claim 2, wherein the third regulating portion (74) extends in a direction that is substantially parallel to a center line of rotation of the yarn pooling roller (51) along a surface of the yarn pooling section (52).
The spinning unit according to Claim 2 or 3, wherein the first regulating portion (72), the second regulating portion (73), and the third regulating portion (74) are integrally formed as parts of a plate member.
The spinning unit according to Claim 4, wherein the third regulating portion (74) is a part of the plate member that is formed into a convex portion protruding towards the yarn pooling section (52) side.
The spinning unit according to Claim 4 or 5, wherein the yarn pooling device (50) further includes a pooled-yarn amount sensor (56, 57) adapted to detect a pooled amount of the spun yarn (Y) wound around the yarn pooling roller (51) and that is mounted on the plate member.
The spinning unit according to one of Claims 1 to 6, wherein the spinning device (7) is an air spinning device adapted to form the spun yarn (Y) by twisting the fiber bundle (F) by a swirling airflow.
A spinning machine comprising a plurality of the spinning units (2) according to any one of Claims 1 to 7.