JP2010089908A - Yarn sag removing device and textile machine having the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a yarn sag removing device capable of smoothly unreeling yarn by restraining an influence of a tension variation at the upstream side. <P>SOLUTION: The yarn sag removing device has a roller 42. A winding area 60 of winding the yarn in the roller 42 is formed in a tapered shape which becomes small in a diameter toward a downstream side from an upstream side for starting the winding of the yarn. The winding area 60 is constituted of a first tapered part 62 and a second tapered part 63, and constituted so that a tapered angle becomes gentle in two stages of the first tapered part 62 and the second tapered part 63 for progressing to the downstream side, and also constituted so that the area of the first tapered part 62 large in the tapered dangle becomes smaller than the area of the second tapered part 63 small in the tapered angle. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a yarn slack eliminating device, and more particularly, to a shape of a roller portion provided for storing the yarn in the yarn slack eliminating device.

  Conventionally, in a high-speed spinning machine such as a pneumatic spinning machine that winds the spun yarn to form a package, when performing splicing work to spun the spun spun yarn with the yarn on the package side, etc. In addition, the winding on the package side is controlled to be stopped. However, since the yarn is sent one after another from the spinning device even when the winding is stopped, it is necessary to prevent the yarn from loosening and staying.

In view of this point, Patent Literature 1 discloses a yarn slack eliminating device including a slack eliminating roller that is rotationally driven by an electric motor, and a yarn hooking member that is rotatable relative to the slack eliminating roller. While the winding operation is stopped by the yarn splicing operation, the slack removal roller stores yarns fed one after another from the spinning device side to prevent the yarn from slackening and staying. Further, this yarn slack eliminating device adds a relative rotational torque to the yarn hooking member by magnetic means, and is excellent in followability to yarn tension fluctuation. The yarn slack eliminating device of this configuration can also function as a kind of tension control device that suppresses fluctuations in yarn tension.
JP 2006-306588 A

  In a slack eliminating roller (roller portion) provided in a yarn slack eliminating device as shown in Patent Document 1, a portion around which a yarn is wound is formed in a taper shape. As a result, the yarn wound around the slack eliminating roller moves so as to be pushed downstream by the yarn to be wound later, and the yarn is transferred to the slack eliminating roller in an aligned state without being biased to the upstream side of the winding portion. Wrapped. As a result, the yarn can be smoothly drawn out to the winding device side.

  Further, in order to prevent upstream propagation of the tension fluctuation that occurs on the downstream side of the yarn slack eliminating device, it is effective to configure the taper angle of the winding portion to be large. That is, by configuring the taper angle to be large, even if a large tension fluctuation occurs on the downstream side of the yarn slack eliminating device, the tension fluctuation is absorbed by the winding portion with the large taper angle, and the tension fluctuation is propagated upstream. Can be prevented. However, when the taper angle of the slack eliminating roller is increased, the pitch of the yarn wound around the slack eliminating roller is increased, and the yarn cannot be efficiently stored, resulting in an increase in the size of the slack eliminating roller. Further, if the taper angle is increased, the difference between the upstream diameter and the downstream diameter of the slack eliminating roller is increased, which causes slack in the yarn wound on the downstream side of the slack eliminating roller. On the other hand, if the slack is too large, looping will occur and the yarn cannot be unwound.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a yarn slack eliminating device that can smoothly unwind yarn while suppressing the influence of tension fluctuation to the upstream side.

Means and effects for solving the problems

  The problems to be solved by the present invention are as described above. Next, means for solving the problems and the effects thereof will be described.

  According to the first aspect of the present invention, the following configuration is provided in a yarn slack eliminating device that includes a roller portion for winding a yarn and is used in a textile machine. That is, in the yarn slack eliminating device, at least a part of the winding region around which the yarn of the roller portion is wound is tapered so that the diameter decreases from the upstream side to the downstream side where the yarn winding starts. It has a winding part. Further, the taper angle of the taper winding part is configured to be gradually reduced as it proceeds downstream.

  As a result, the upstream winding region with a tight taper angle can suppress the fluctuation of the tension generated downstream from the yarn slack eliminating device from propagating upstream from the yarn slack eliminating device. Further, since the taper angle is gradually reduced, the difference in diameter from the downstream side can be reduced even when the upstream taper angle is large. As a result, loosening of the yarn caused by an increase in the difference in diameter between the upstream side and the downstream side of the winding region can be prevented, and the occurrence of loop loss can be effectively suppressed. Furthermore, since the structure of the winding area of the roller portion is configured to change the taper angle in a stepwise manner, it can be easily manufactured without going through a complicated work process.

  The yarn slack eliminating device is preferably configured as follows. That is, the taper winding part has an upstream winding region and a downstream winding region. The taper angle of the downstream winding region is smaller than the taper angle of the upstream winding region. Further, the area of the upstream winding region is configured to be smaller than the area of the downstream winding region.

  As a result, the tension fluctuation generated downstream of the yarn slack eliminating device propagates to the upstream side of the yarn slack eliminating device while ensuring a large amount of yarn storage in the downstream winding region where the taper angle is small. Can be prevented.

  In the yarn slack eliminating device, the taper angle of the upstream winding region is preferably 1.5 degrees or more and 3.5 degrees or less.

  As a result, the yarn can be stored smoothly and the propagation of tension fluctuations upstream from the yarn slack eliminating device can be reliably blocked.

The yarn slack eliminating device preferably includes a yarn amount detection unit disposed in the vicinity of the upstream winding region in order to detect the yarn amount stored in the roller unit.

  As a result, it is possible to efficiently perform control such that a certain amount or more of yarn is stored in the upstream winding region. Therefore, it is possible to prevent the tension fluctuation generated on the downstream side of the yarn slack eliminating device from being propagated to the upstream side by effectively utilizing the upstream winding region having a high effect of absorbing the tension fluctuation.

  According to the 2nd viewpoint of this invention, a textile machine provided with the said thread slack removal apparatus is provided.

  As a result, even when a tension fluctuation occurs on the downstream side of the yarn slack eliminating device, it is possible to prevent the tension fluctuation from being propagated by the yarn slack eliminating device, and various operations can be performed stably.

  Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view showing a spinning machine (textile machine) according to an embodiment of the present invention. FIG. 2 is a side sectional view of the spinning machine according to the present embodiment. In the following description, “upstream” and “downstream” mean upstream and downstream in the running direction of the yarn during spinning.

  As shown in FIG. 1, the spinning machine 1 according to the present embodiment includes a plurality of spinning units 2, a yarn splicing cart 3, a doffing cart 4, a blower box 80, a prime mover box 5, and a frame 6. Prepare. The spinning units 2 are arranged on the frame 6 so as to be arranged in parallel, and a package 45 having a predetermined length is formed for each spinning unit 2. The frame 6 is provided with a rail 41 and a traveling path 86 arranged along the direction in which the spinning units 2 are arranged, and the yarn splicing cart 3 is configured to be able to travel along the rail 41, and the ball The lift truck 4 is configured to be able to travel along the travel path 86.

  Next, the spinning unit 2 will be described. As shown in FIG. 1, each spinning unit 2 includes a draft device 7, a spinning device 9, a yarn feeding device 11, a yarn slack eliminating device 12, a winding device 13, in order from upstream to downstream. As a main component. The draft device 7 is provided in the vicinity of the upper end of the frame 6 of the spinning machine 1 and is used for drawing the sliver 15 into the fiber bundle 8. The spinning device 9 is configured such that the fiber bundle 8 sent by the draft device 7 is twisted and spun. The spun yarn 10 delivered from the spinning device 9 is fed by the yarn feeding device 11, passes through a yarn clearer 52 to be described later, and then wound by the winding device 13 via the yarn slack eliminating device 12. 45 is formed.

  As illustrated in FIG. 2, the draft device 7 includes four rollers: a back roller 16, a third roller 17, a middle roller 19 on which an apron belt 18 is mounted, and a front roller 20. The draft device 7 is configured to extend the sliver 15 by these draft rollers and send it to the spinning device 9 on the downstream side.

  The spinning device 9 employs a pneumatic device that generates a spun yarn 10 from the fiber bundle 8 using a swirling airflow. The spinning device 9 can adopt any method as long as the fiber bundle 8 is spun, and is not limited to the pneumatic type.

  The yarn feeding device 11 includes a delivery roller 39 supported by the frame 6 of the spinning machine 1 and a nip roller 40 provided in contact with the delivery roller 39. The spun yarn 10 delivered from the spinning device 9 is sent to the winding device 13 side by being driven by an electric motor (not shown) while the delivery roller 39 is rotated between the delivery roller 39 and the nip roller 40. It is.

  The yarn clearer 52 is disposed on the front side of the frame 6 of the spinning machine 1 and slightly downstream of the yarn feeder 11. The spun yarn 10 spun by the spinning device 9 passes through the yarn clearer 52 before being wound by the winding device 13. The yarn clearer 52 is configured to monitor the thickness of the traveling spun yarn 10 and transmit a yarn defect detection signal to the control unit 73 (not shown in FIG. 2) when a yarn defect of the spun yarn 10 is detected. Yes. Upon receiving the yarn defect detection signal, the control unit 73 immediately cuts the spun yarn 10 with the cutter 57, and further stops the draft device 7, the spinning device 9, and the like. In addition, the control unit 73 sends a control signal to the yarn splicing cart 3 to travel to the front of the spinning unit 2. Thereafter, the spinning device 9 and the like are driven again, and the yarn joining cart 3 is spliced to resume spinning and winding. A yarn slack eliminating device 12 is provided further downstream of the yarn clearer 52, and the spun yarn 10 that has passed through the yarn clearer 52 is sent to the yarn slack eliminating device 12.

  The yarn slack eliminating device 12 is for eliminating slack and stay of the spun yarn 10 that has passed through the yarn clearer 52 and adjusting the winding tension. The details of the yarn slack eliminating device 12 will be described later. The spun yarn 10 whose tension is adjusted by the yarn slack eliminating device 12 is sent to the winding device 13 on the downstream side.

  The winding device 13 includes a cradle arm 71, a winding drum 72, and a traverse device 75. One end of the cradle arm 71 is supported so as to be swingable around the support shaft 70, and the other end is configured to be able to rotatably support a bobbin 48 for winding the spun yarn 10. . The winding drum 72 is configured to be able to be driven in contact with the outer peripheral surface of the package 45 formed by winding the bobbin 48 and the spun yarn 10 thereon. The traverse device 75 includes a traverse guide 76 that can be engaged with the spun yarn 10. In this configuration, the winding drum 72 is driven by an electric motor (not shown) while the traverse guide 76 is reciprocated by a driving means (not shown), thereby rotating the package 45 in contact with the winding drum 72 and spinning the yarn 10. It is designed to wind up while traversing.

  As shown in FIGS. 1 and 2, the yarn joining cart 3 includes a splicer (yarn joining device) 43, a yarn joining suction pipe 44, and a suction mouth 46. The yarn joining cart 3 is configured to travel on the rail 41 to the spinning unit 2 and stop when the yarn breakage or yarn cut occurs in the spinning unit 2. The yarn splicing suction pipe 44 is configured to suck and capture the yarn end fed from the spinning device 9 and guide it to the splicer 43 while rotating in the vertical direction about the axis. On the other hand, the suction mouth 46 is configured to suck and guide the yarn end from the package 45 supported by the winding device 13 and guide it to the splicer 43 while rotating in the vertical direction about the axis. Yes. The splicer 43 is for piecing the yarn ends guided by the yarn joining suction pipe 44 and the suction mouth 46.

  As shown in FIGS. 1 and 2, the doffing cart 4 includes a doffing device 92, a cradle operation arm 90, a doffing suction pipe 88, and a bunch winding arm 91. The doffing cart 4 is configured to travel on the traveling path 86 to the spinning unit 2 and stop when the package 45 becomes full in the spinning unit 2. The cradle operation arm 90 is configured to be able to operate the cradle arm 71 of the winding device 13. The doffing suction pipe 88 is configured to be extendable and retractable, and is configured to be able to capture the yarn end fed from the spinning device 9 while sucking and guide it to the bobbin 48 attached to the winding device 13. Yes. The bunch winding arm 91 is for fixing the spun yarn 10 to the bobbin 48 by winding the yarn around the bobbin 48.

  Next, the details of the yarn slack eliminating device 12 will be described with reference to FIG. FIG. 3 is a schematic cross-sectional view showing how the yarn slack eliminating device 12 and the winding device 13 are controlled. As shown in FIG. 3, the yarn slack eliminating device 12 includes a slack eliminating roller 21, a yarn hooking member 22, a storage sensor 74, and an electric motor 25 as main components. The electric motor 25 is for driving the slack eliminating roller 21 to rotate, and is connected to the slack eliminating roller 21. The electric motor 25 is electrically connected to a control unit 73, and the rotation of the slack eliminating roller 21 is appropriately controlled by the control unit 73.

  Further, an upstream guide 23 disposed on the upstream side of the yarn slack eliminating device 12 and a downstream guide 26 disposed on the downstream side of the yarn slack eliminating device 12 are disposed in the vicinity of the yarn slack eliminating device 12. The spun yarn 10 is guided to an appropriate yarn path by these guides. Further, as shown in FIG. 3, the upstream guide 23 is connected to driving means including a cylinder 24 and the like, and the upstream guide 23 is moved between the advanced position and the retracted position by expansion and contraction of the cylinder 24. Can be moved. By moving the upstream guide 23, the yarn path of the spun yarn 10 can be changed, and the yarn hooking member 22 can be engaged with the spun yarn 10 when necessary. Specifically, by moving the upstream guide 23 to the advanced position by the cylinder 24, the spun yarn 10 and the yarn hooking member 22 can be kept out of engagement, and the upstream guide 23 is moved to the retracted position. Thus, the yarn hooking member 22 can be engaged with the spun yarn 10.

  The slack eliminating roller 21 includes a roller portion 42 fixed to the motor shaft 27 of the electric motor 25. A winding region 60 is formed on the outer peripheral surface of the roller portion 42, and the spun yarn 10 sent from the spinning device 9 side is wound (stored) around the winding region 60. The yarn hooking member 22 is disposed at the front side end of the spinning machine 1 of the slack eliminating roller 21, and a fryer shaft 33 supported so as to be relatively rotatable with respect to the slack eliminating roller 21, and a fryer fixed to the tip thereof. 38. The flyer shaft 33 is configured to rotate integrally or independently with the slack eliminating roller 21 according to conditions. A permanent magnet is attached to either the flyer shaft 33 or the roller portion 42, and a magnetic hysteresis material is attached to the other. By these magnetic means, a torque is generated that resists the relative rotation of the yarn hooking member 22 relative to the slack eliminating roller 21.

  The flyer 38 is configured to rotate integrally with the flyer shaft 33. Further, the flyer 38 is configured to be appropriately curved toward the outer peripheral surface (the winding region 60) of the roller portion 42. Accordingly, the flyer 38 can engage with the spun yarn 10 (hook the spun yarn 10) and guide the spun yarn 10 to the winding region 60 of the roller portion 42.

  The storage sensor 74 is a non-contact optical sensor and is electrically connected to the control unit 73. The storage sensor 74 detects whether or not a certain amount of yarn is wound around the winding region 60 of the roller unit 42, and transmits a detection signal to the control unit 73. The storage sensor 74 is disposed such that the light projecting unit and the light receiving unit (detecting unit) face the upstream portion of the winding region 60.

  Next, the shape of the roller portion 42 will be described with reference to FIG. FIG. 4 is a side view showing a state of the winding region 60 of the roller portion 42. In the following description, “base end side” means the side connected to the electric motor 25, and “tip end side” means the front side of the apparatus on which the flyer 38 is arranged. Further, as will be described in detail later, in the yarn slack eliminating device 12, the yarn is first wound around the proximal end side of the roller portion 42 and then gradually moved toward the distal end side before being unwound. Therefore, the proximal end side of the roller portion 42 corresponds to the upstream side in the yarn traveling direction, and the distal end side corresponds to the downstream side.

  The roller portion 42 includes a proximal end flange portion 61, a winding region 60, and a distal end side flange portion 64 in order from the proximal end side (upstream side) to the distal end side (downstream side). The proximal end flange portion 61, the winding region 60, and the distal end side flange portion 64 are integrally formed of an appropriate metal. The winding region 60 has a taper winding portion formed in a taper shape in which the diameter of the portion around which the yarn is wound becomes smaller as it proceeds from the upstream side to the downstream side. Further, the taper winding portion has a different taper angle between the upstream first taper portion (upstream winding region) 62 and the downstream second taper portion (downstream winding region) 63. It is configured. Hereinafter, each part of the roller part 42 will be described from the upstream side.

  The proximal end flange portion 61 has a tapered shape in which the end face side is a large diameter side and the connection portion side with the first taper portion 62 is a small diameter side, and a step is generated from the first taper portion 62. Connected without. The base end side flange portion 61 is formed in a tapered shape whose diameter decreases toward the first taper portion 62, whereby the spun yarn 10 guided from the upstream side has the base end side flange portion 61 and the first taper portion. It is guided to the winding start position in the vicinity of the connecting portion with 62.

  As shown in FIG. 4, the first taper portion 62 is formed in a linear taper shape that narrows at an angle α from the upstream side toward the downstream side, and is bent slightly on the downstream side so as to bend to the second taper portion 63. It is connected. The angle α is preferably not less than 1.5 degrees and not more than 3.5 degrees. In the present embodiment, the angle α is configured to have a taper angle of 1.5 degrees. Further, the storage sensor 74 shown in FIG. 3 is disposed so as to face the first tapered portion 62, and the yarn amount in the vicinity of the winding start position where the winding of the spun yarn 10 is started is measured. Monitoring.

  The second taper portion 63 is connected to the first taper portion 62 and is formed in a linear taper shape that narrows at an angle β from the upstream side toward the downstream side. The taper angle β of the second taper portion 63 is configured to be smaller than the taper angle α of the first taper portion 62 (α> β). In the present specification, the “taper angle” refers to an angle at which the outer peripheral surface (thread winding surface) is inclined with respect to the rotation axis of the roller portion 42. In the present embodiment, the second taper portion 63 is configured to have a taper angle of 1.0 degree. As a result, the spun yarn 10 can be smoothly wound and the spun yarn 10 can be pulled out downstream.

  The second taper portion 63 is configured such that the length of the roller portion 42 in the axial direction is shorter than the first taper portion 62. Accordingly, the area of the first taper portion 62 where the yarn can be wound is smaller than the area of the second taper portion 63 where the yarn can be wound. And the 2nd taper part 63 is connected without the level | step difference in the front end side flange part 64 in the downstream.

  The distal end side flange portion 64 is formed in a taper shape with the end face side as the large diameter side and the connection portion side of the second taper portion 63 as the small diameter side. When the spun yarn 10 is unwound, the leading end side flange portion 64 can prevent a loop-out phenomenon in which the wound spun yarn 10 comes off at once.

  With this configuration, the spun yarn 10 sent from the upstream side is wound around the roller portion 42 rotating at a predetermined rotational speed via the yarn hooking member 22. The spun yarn 10 wound around the roller portion 42 is guided to the winding start position of the first tapered portion 62 while sliding on the tapered peripheral surface of the proximal end side flange portion 61. The spun yarn 10 wound around the first taper portion 62 is pushed to the downstream side (the front end side of the roller portion 42) by the spun yarn 10 wound sequentially from the upstream side. Since the first taper portion 62 is formed in a tapered shape, the spun yarn 10 is aligned in a winding start position (a connection portion between the base end side flange portion 61 and the first taper portion 62) without being biased. It is wound around the winding region 60 in a spiral shape. In addition, since the connection portion between the first taper portion 62 and the second taper portion 63 is smoothly connected, even when the spun yarn 10 is stored in the second taper portion 63 beyond the first taper portion 62, Winding around the second tapered portion 63 is favorably performed without the spun yarn 10 being caught at the connecting portion. In addition, since the winding area 60 is configured to reduce the taper angle in two stages, the diameter of the winding area 60 at the winding start position and the diameter of the winding area 60 in the vicinity of the distal end side flange portion 64 Can be reduced. As a result, in the downstream winding region 60 having a small diameter, the spun yarn 10 that has lifted from the peripheral surface is pulled out to the tip side of the roller portion 42 in a state of forming a multiple ring at a time (ring Occurrence of omission) can be suppressed.

  Further, the yarn hooking member 22 can rotate independently of the slack eliminating roller 21, and a resistance torque in a direction against the rotation is applied by magnetic means. Therefore, if the tension applied to the spun yarn 10 engaged with the flyer 38 is strong enough to overcome the resistance torque, the yarn hooking member 22 rotates independently of the slack eliminating roller 21 to remove the yarn from the slack eliminating roller 21. Unravel. On the contrary, if the tension applied to the yarn is weak, the yarn hooking member 22 rotates integrally with the slack eliminating roller 21 and winds the yarn around the slack eliminating roller 21. In this way, the yarn slack eliminating device 12 operates so as to wind the yarn when the yarn tension is lowered (the yarn is about to loosen) and to release the yarn when the yarn tension is increased, thereby loosening the yarn. It is possible to solve the problem and to apply an appropriate tension. The spun yarn 10 is wound from the base end side (connection portion between the base end flange portion 61 and the first taper portion 62), while the spun yarn 10 is unwound from the front end side of the roller portion 42 when unwinding. I will be deceived.

  The tension applied to the spun yarn 10 is basically determined by the yarn feeding speed of the yarn feeding device 11 and the winding speed of the winding device 13. That is, if the winding speed is higher than the yarn feeding speed, the tension applied to the yarn increases. Conversely, if the winding speed is slower than the yarn feeding speed, the tension applied to the yarn decreases. Since the yarn feeding speed (spinning speed) of the yarn feeding device 11 is normally constant, the tension applied to the spun yarn 10 varies mainly with the winding speed of the winding device 13.

  During normal winding, the winding speed of the winding drum 72 is set so that the winding speed is slightly higher than the yarn feeding speed of the yarn feeding device 11 in order to give an appropriate winding tension to the spun yarn 10. ing. Accordingly, the spun yarn 10 wound around the slack eliminating roller 21 is gradually unwound and the yarn storage amount is reduced. During normal winding, the yarn slack eliminating device 12 is configured to store the spun yarn 10 using only the region of the first taper portion 62. The spun yarn 10 is wound up to the second tapered portion 63 in the roller portion 42 basically during the yarn splicing operation and the doffing operation.

  Next, detection of the storage amount of the yarn slack eliminating device 12 and control of the winding speed will be described. As described above, whether or not a certain amount of yarn is stored in the roller portion 42 is detected by the storage sensor 74. In the present embodiment, from the viewpoint of preventing the spun yarn 10 from slipping at the roller portion 42, the yarn storage amount is monitored so that the number wound around the winding region 60 always exceeds at least 15 turns. Specifically, the storage sensor 74 is configured to detect a portion where the yarn wound around the roller portion 42 is approximately the 15th turn. When the storage sensor 74 detects that there is no yarn at the detection location, the storage sensor 74 transmits a signal indicating that the amount of yarn stored in the winding region 60 is equal to or less than a predetermined value to the control unit 73.

  When the control unit 73 receives a signal indicating that the yarn amount is less than or equal to a predetermined value by the storage sensor 74, the control unit 73 controls the cradle arm 71 to rotate in the arrow direction (left side) in FIG. Then, the package 45 is separated from the winding drum 72. Thereby, transmission of the driving force to the package 45 by the winding drum 72 is interrupted. The package 45 that has lost its driving force continues inertial rotation, but its winding speed gradually decreases.

  By reducing the winding speed, the amount of yarn drawn per unit time from the winding region 60 to the winding device 13 is reduced, and eventually, per unit time newly wound around the winding region 60 from the upstream side. Below the yarn amount. As a result, the yarn storage amount is recovered. Whether or not a certain amount of yarn is wound around the winding region 60 of the roller portion 42 is determined by the time when the package 45 is separated from the winding drum 72 by the cradle arm 71. The time for separating the package 45 from the winding drum 72 is set as appropriate depending on the winding diameter of the package 45 and other conditions. For example, when the diameter of the package 45 is large, since the inertia is large and the winding speed is gradually lowered, control such as setting a long time for separating from the winding drum 72 is performed.

  When a predetermined time elapses after the package 45 is separated from the winding drum 72 and a predetermined amount of yarn is wound around the winding region 60 of the roller unit 42, the control unit 73 moves the cradle arm 71 to the right side in FIG. The package 45 is rotated and brought into contact with the winding drum 72. At this time, when the take-up drum 72 comes into contact with the package 45 which has been inertially rotated until then, a sudden fluctuation in tension occurs. The tension fluctuation caused by the contact of the winding drum 72 tends to propagate upstream via the yarn slack eliminating device 12. However, the roller portion 42 provided in the yarn slack eliminating device 12 of the present invention has a first taper portion 62 having a taper angle of 1.5 degrees as a propagation preventing region for preventing the downstream tension fluctuation from propagating to the upstream side. Is formed. Therefore, even when a sudden tension variation caused by the winding drum 72 coming into contact with the package 45 occurs, the first taper portion 62 can suppress the tension variation from being transmitted to the upstream side of the yarn slack eliminating device 12.

  As described above, the yarn slack eliminating device 12 adjusts the winding speed by monitoring the spun yarn 10 stored in the first taper portion 62 by the storage sensor 74 and performing feedback control of the cradle arm 71. The amount of yarn stored in the winding region 60 of the roller portion 42 is adjusted. As a result, the winding tension can be made constant while always maintaining a state in which a certain amount or more of the spun yarn 10 is stored in the slack eliminating roller 21. In the present embodiment, the storage sensor 74 is arranged so as to monitor the yarn amount of the first taper portion 62. As a result, even when a tension variation occurs on the winding device 13 side, the first taper portion 62 can reliably absorb the tension variation that is to propagate to the upstream side of the yarn slack eliminating device 12.

  In the spinning machine 1 of the present embodiment, the yarn slack eliminating device is stopped during the yarn joining operation by the yarn joining cart 3 and the doffing operation by the doffing cart 4 because the winding operation by the winding device 13 is stopped. By storing the spun yarn 10 in 12, the stay of the spun yarn 10 is prevented. For example, in the yarn joining operation, the winding operation is stopped, and the yarn joining operation is performed by the splicer 43 of the yarn joining carriage 3. During this time, the yarn slack eliminating device 12 stores the spun yarn 10 supplied from the spinning device 9 side in the winding region 60. This prevents the yarn from staying and enables a smooth return to the winding operation. Further, in the doffing work, the winding work is stopped, the bunch winding arm 91 performs the bunch winding, and the doffing work in which the yarn end is fixed to the empty bobbin 48 is performed. In the yarn slack eliminating device 12, in the doffing operation as well as the yarn splicing operation, the yarn 10 from the spinning device 9 is stored in the winding region 60 to prevent the yarn from staying. Can be smoothly transitioned to. In such a yarn splicing operation and a doffing operation, a larger amount of yarn is stored in the winding region 60 than in normal winding, and the second taper portion 63 is also passed over the first taper portion 62. The spun yarn 10 is stored.

  Since the second taper portion 63 is configured to have a gentler taper angle with respect to the first taper portion 62, the pitch of the spun yarn 10 wound around the second taper portion 63 can be reduced, and the spun yarn 10 can be It can be wound efficiently. Further, as described above, since the second tapered portion 63 is configured to be wider than the first tapered portion 62, a large amount of the spun yarn 10 can be wound around the second tapered portion 63. As a result, the upper limit of the amount of yarn that can be stored can be increased within a range in which the spun yarn 10 is not wound around the spun yarn 10 wound around the winding region 60 (double winding). Therefore, even when a large amount of the spun yarn 10 is stored in the winding region 60 as in the yarn splicing operation or the doffing operation, the yarn slack eliminating device 12 of the present invention has the spun yarn 10. Can be secured in the winding region 60 by a sufficient amount for winding the wire.

  As described above, the yarn slack eliminating device 12 of the present embodiment is configured as follows. That is, the yarn slack eliminating device 12 has a taper winding in which the winding region 60 around which the yarn of the roller portion 42 is wound is formed in a taper shape whose diameter decreases from the upstream side to the downstream side where the yarn winding starts. Has a part. Further, the taper angle of the taper winding part (winding region 60) is configured to be gradually reduced as it goes downstream.

  As a result, the winding region 60 on the upstream side where the taper angle is tight can prevent the tension fluctuation generated downstream from the yarn slack eliminating device 12 from propagating upstream from the yarn slack eliminating device 12. Further, since the taper angle is gradually reduced, the difference in diameter from the downstream side can be reduced even when the upstream taper angle is large. As a result, loosening of the yarn caused by an increase in the difference in diameter between the upstream side and the downstream side of the winding region 60 can be prevented, and the unwinding operation toward the winding device 13 can be performed smoothly. Moreover, since the yarn can be prevented from loosening as described above, the occurrence of loop loss can be effectively suppressed. Furthermore, since the structure of the winding region 60 of the roller portion 42 is configured to change the taper angle in a stepwise manner, it can be easily manufactured without going through a complicated work process.

  Further, in the yarn slack eliminating device 12 of the present embodiment, the taper winding portion (winding region 60) of the roller portion 42 is a second taper having a small taper angle with the first taper portion (upstream winding region) 62. Part (downstream winding region) 63. The taper angle of the second taper portion 63 is configured to be smaller than the taper angle of the first taper portion 62. In addition, the area of the first taper portion 62 is configured to be smaller than the area of the second taper portion 63.

  By adopting a configuration in which the taper angle changes in two stages in this way, while ensuring a large storage amount of the spun yarn 10 at the second taper portion 63 with a small taper angle, the taper angle is more downstream than the yarn slack eliminating device 12. The generated tension fluctuation can be prevented from propagating to the upstream side of the yarn slack eliminating device 12.

  Moreover, in the yarn slack eliminating device 12 of the present embodiment, the taper angle of the first taper portion 62 is configured to be 1.5 degrees that is in the range of 1.5 degrees to 3.5 degrees.

  As a result, the spun yarn 10 can be stored smoothly and the propagation of tension fluctuations upstream from the yarn slack eliminating device 12 can be reliably blocked.

  Further, the yarn slack eliminating device 12 of the present embodiment includes a storage sensor 74 disposed in the vicinity of the first taper portion 62 in order to detect the amount of yarn stored in the roller portion 42.

  Thereby, it is possible to efficiently perform control such that a certain amount or more of the spun yarn 10 is stored in the first taper portion 62. Accordingly, it is possible to effectively prevent the tension fluctuation generated downstream from the yarn slack eliminating device 12 from being propagated upstream by effectively using the first taper portion 62 having a high effect of absorbing the tension fluctuation. Further, in the present embodiment, it is configured to determine whether or not the yarn amount is sufficiently stored based on the time when the package 45 is separated from the winding drum 72. Accordingly, only one storage sensor 74 is required to control the yarn amount to ensure a certain amount or more in the roller portion 42, and the configuration can be simplified.

  The spinning machine 1 includes the yarn slack eliminating device 12.

  As a result, even when a tension variation occurs on the downstream side of the yarn slack eliminating device 12, it is possible to prevent the tension variation from being propagated by the yarn slack eliminating device 12, and to stabilize the yarn speed on the upstream side of the yarn slack eliminating device 12. be able to. Further, the yarn clearer 52 is disposed upstream of the yarn slack eliminating device 12, but the yarn clearer 52 passes through the yarn clearer 52 by preventing the downstream tension fluctuation from being propagated to the upstream side. The yarn speed to be stabilized can be stabilized, and the yarn defect detection accuracy can be improved. Thus, by providing the spinning machine 1 with the yarn slack eliminating device 12 of the present invention, the quality of the spun yarn can be effectively improved.

  The roller portion 42 of the above embodiment has a configuration in which the taper angle changes in two stages, but can be changed to a configuration in which the taper angle of the roller portion changes in three or more stages. Further, the taper angle can be appropriately changed according to circumstances.

  Next, a modification in which the taper angle of the roller portion changes in three stages will be described with reference to FIG. In the modified example described below, the configuration other than that in which the roller portion 142 changes the taper angle in three stages is the same as in the above embodiment, and therefore, the same reference numerals may be attached to the drawings and description thereof may be omitted. .

  Similarly to the above-described embodiment, the roller portion 142 of the modification includes a proximal end flange portion 61, a winding region 160, and a distal end side in order from the proximal end side (upstream side) to the distal end side (downstream side). And a flange portion 64. The winding region 160 has a taper winding portion formed in a taper shape in which the diameter of the portion around which the yarn is wound becomes smaller as it proceeds from the upstream side to the downstream side. The taper winding portion has a taper angle between the first taper portion 162 on the most upstream side, the second taper portion 163 in the middle of the winding region 160, and the second taper portion 163 on the most downstream side. Configured differently. Hereinafter, the taper portion of the winding region 160 will be described in order from the upstream side.

  As shown in FIG. 5, the first taper portion 162 is formed in a linear taper shape that narrows at an angle α2 from the upstream side to the downstream side, and is bent slightly on the downstream side to the second taper portion 163. It is connected. In the modification, the angle α2 is configured to be a taper angle of 1.5 degrees.

  The second taper portion 163 has an upstream side connected to the first taper portion 162 and a downstream side connected to the third taper portion 164. The second taper portion 163 is formed in a linear taper shape that narrows at an angle β2 from the upstream side toward the downstream side. In the modification, the angle β2 is configured to have a taper angle of 1.0 degree.

  The third taper portion 164 is connected to the first taper portion 162 on the upstream side and is connected to the distal end flange portion 64 on the downstream side. The third taper portion 164 is formed in a linear taper shape that narrows at an angle γ from the upstream side toward the downstream side. In the modification, the angle γ is configured to be a taper angle of 0.3 degrees.

  The roller part 142 of the modified example is configured such that the taper angle decreases in three stages from the upstream side to the downstream side. (Α2> β2> γ). With this configuration, the spun yarn 10 sent from the upstream side is wound around the roller portion 142 rotating at a predetermined rotational speed via the yarn hooking member 22.

  In this way, by reducing the taper angle in three stages, the winding start position of the winding region 160 is secured while ensuring the function of effectively preventing the first taper portion 162 from propagating tension fluctuations upstream. And the downstream diameter in the vicinity of the front end flange portion 64 of the winding region 160 can be further reduced. As a result, the occurrence of loop loss can be effectively suppressed.

  Moreover, in the said embodiment, although all the winding area | regions 60 are formed in the taper shape where a diameter becomes small as it goes downstream from an upstream, it is not limited to this structure. For example, a part of the upstream side of the winding region is formed in a tapered shape whose diameter decreases as it goes from the upstream side to the downstream side, and a part of the downstream side of the winding region becomes as it goes from the upstream side to the downstream side. It can also be formed in a tapered shape with a large diameter.

  Next, with reference to FIG. 6, the roller part 242 of the modification in which a part of the downstream side of the winding area | region 260 is comprised in reverse taper shape is demonstrated. Note that in this modification as well, the same configurations as those in the above embodiment may be denoted by the same reference numerals in the drawings, and description thereof may be omitted.

  As shown in FIG. 6, the upstream side of the winding region 260 has a tapered winding portion formed in a tapered shape whose diameter decreases from the upstream side toward the downstream side. The taper winding portion is configured by a first taper portion 262 that narrows at an angle α and a second taper portion 263 that narrows at an angle β so that the taper angle becomes smaller in two stages (α> β). A reverse tapered portion 264 having a diameter increasing from the upstream side toward the downstream side is formed on the downstream side of the second tapered portion 263. Even if the spun yarn 10 wound around the winding region 260 is lifted from the peripheral surface by the second taper portion 263, the spun yarn 10 reaches the reverse taper portion 264 whose diameter increases toward the downstream side. Thus, the gap between the winding region 260 and the spun yarn 10 can be reduced, and the occurrence of loop loss can be effectively prevented.

  Although the preferred embodiment of the present invention has been described above, the above configuration can be changed as follows, for example.

  In the above embodiment, only one storage sensor 74 for monitoring the yarn amount in the winding region 60 is disposed, but the present invention is not limited to this configuration. For example, control is performed so that the yarn amount is stored in the winding region at a certain level or more by the upstream storage sensor arranged on the upstream side of the winding region and the downstream storage sensor arranged on the downstream side of the winding region. It can also be set as the structure to do.

  The means for generating a resistance torque against the relative rotation between the yarn hooking member 22 and the slack eliminating roller 21 is changed to, for example, an electromagnetic means using an electromagnet or a mechanical means using a frictional force instead of a magnetic means. can do.

  The spinning machine 1 of the above embodiment is configured to include a draft device 7, a spinning device 9, a yarn feeding device 11, a yarn slack eliminating device 12, and a winding device 13 as main components. Embodiments can be changed as appropriate. For example, it can change to the structure which a part of structure of the said embodiment was abbreviate | omitted, or the structure which added the other member. Further, the present invention can be applied not only to the spinning machine but also to other textile machines such as an automatic winder.

The front view which showed the mode of the spinning machine which concerns on one Embodiment of this invention. 1 is a side cross-sectional view of a spinning machine according to an embodiment. The schematic cross section which showed the mode of control of a yarn slack removal apparatus and a winding apparatus. The side view which showed the mode of the winding area | region of the roller part. The side view which showed the mode of the winding area | region of the roller part of the modification in which a taper angle becomes small in three steps. The side view which showed the mode of the winding area | region of the roller part of a modification provided with a reverse taper part.

Explanation of symbols

1 Spinning machine (textile machine)
12 Thread Loosening Removal Device 42 Roller Part 60 Winding Area 62 First Tapered Part (Upstream Winding Area)
63 2nd taper part (downstream side winding area)
74 Storage sensor (yarn amount detection unit)

Claims (5)

In a yarn slack eliminating device used in a textile machine, comprising a roller portion for winding a yarn
At least a part of the winding region around which the yarn of the roller portion is wound has a taper winding portion formed in a tapered shape whose diameter decreases from the upstream side to the downstream side where the yarn winding starts. And
The yarn slack eliminating device, wherein the taper angle of the taper winding portion is configured to be gradually reduced as it proceeds downstream. The yarn slack eliminating device according to claim 1,
The taper winding part has an upstream winding region and a downstream winding region,
The taper angle of the downstream winding region is smaller than the taper angle of the upstream winding region,
The yarn slack eliminating device, wherein an area of the upstream winding region is configured to be smaller than an area of the downstream winding region. The yarn slack eliminating device according to claim 2,
The yarn slack eliminating device, wherein a taper angle of the upstream winding region is 1.5 degrees or more and 3.5 degrees or less. The yarn slack eliminating device according to claim 2 or 3,
A yarn slack eliminating device, comprising: a yarn amount detection unit disposed in the vicinity of the upstream winding region in order to detect a yarn amount stored in the roller unit.   A textile machine comprising the yarn slack eliminating device according to any one of claims 1 to 4.

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