JP2016023391A - Spinning machine and spinning method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure which is improved in productivity without lowering the success ratio of pick-up spinning in a spinning machine provided with a yarn storage roller.SOLUTION: There is provided a spinning machine in which a spinning device comprises a draft device, an air spinning device, and a yarn storage roller. The draft device has a plurality of draft rollers including a front roller and drafts a fiber bundle. The air spinning device performs spinning to produce a yarn by twisting the fiber bundle drafted by the draft device. The yarn storage roller winds and stores the yarn produced by the air spinning device on the surface. Circumferential speed of the front roller in pick-up spinning differs from that in an ordinary spinning performed after the pick-up spinning. Circumferential speed of the yarn storage roller in pick-up spinning differs from that in an ordinary spinning.SELECTED DRAWING: Figure 5

Description

  The present invention mainly relates to a spinning machine that includes an air spinning device that performs yarn discharge spinning and stores yarn generated by the air spinning device in a yarn storage roller.

  2. Description of the Related Art Conventionally, pneumatic spinning apparatuses that perform yarn discharging spinning are known. Yarn discharge spinning is a process of generating yarn without inserting seed yarn into an air spinning device by performing spinning different from normal spinning at the start of spinning.

  Patent Document 1 discloses a spinning machine that performs yarn discharge spinning. The spinning machine includes a plurality of draft rollers (a back roller, a third roller, a second roller, and a front roller in order from the upstream side) and a plurality of counter rollers. Patent Document 1 describes that by changing the draft ratio, the yarn count during yarn discharge spinning is increased, and the success rate of yarn discharge spinning is increased. As a method for changing the draft ratio, control for changing the rotational speed of a draft roller such as a front roller is described. The spinning machine also includes a slack tube that sucks and stores the yarn supplied from the pneumatic spinning device when performing yarn splicing.

  The spinning machine disclosed in Patent Document 2 includes a plurality of spinning units. Each spinning unit includes a yarn storage roller that winds and stores the yarn supplied from the pneumatic spinning device. Since the front roller and the second roller of all spinning units are driven by using a common drive source in all the spinning units, all the front rollers and all the second rollers are driven at the same rotational speed. The Further, since the third roller and the back roller are provided with a drive source for each spinning unit, the rotation can be controlled according to the situation.

  The spinning machines disclosed in Patent Documents 1 and 2 are configured to pull out the yarn generated by the pneumatic spinning device using a delivery roller and a nip roller. In this type of spinning machine, when the yarn is pulled out from the pneumatic spinning device, the yarn may slip with respect to the delivery roller due to insufficient clamping force. As a spinning machine in consideration of this point, a spinning machine (delivery rollerless spinning machine) is known in which a delivery roller is omitted and a yarn accumulating roller is disposed downstream of an air spinning device (see Patent Document 3).

JP 2003-278035 A Japanese Patent Laid-Open No. 2004-277743 JP 2010-77576 A

  Yarn spinning has a low success rate because yarn breakage is likely to occur in an air spinning device depending on conditions such as yarn raw material, yarn count, and spinning speed. In particular, yarn spinning may not be performed at spinning speeds higher than a predetermined value.

  In Patent Document 2, since the rotation speed and spinning speed of the front roller are the same for each spinning unit, they cannot be changed depending on the situation. Accordingly, when a spinning speed at which yarn spinning is easy to succeed is set, the spinning speed at the time of normal spinning is slowed, so that productivity is lowered. On the other hand, when a high spinning speed is set so as to increase productivity, the probability of failing to perform yarn discharge spinning increases, and as a result, productivity may decrease.

  A main object of the present invention is to provide a spinning machine having a yarn accumulating roller, in which the productivity is improved without reducing the success rate of yarn discharge spinning.

Means and effects for solving the problems

  According to a first aspect of the present invention, a spinning machine includes a draft device, an air spinning device, and a yarn accumulating roller. The draft device has a plurality of draft rollers including a front roller, and drafts the fiber bundle. The pneumatic spinning device performs spinning to produce a yarn by twisting the fiber bundle drafted by the draft device. The yarn storage roller winds and stores the yarn generated by the pneumatic spinning device around the surface. The peripheral speed of the front roller is different during yarn discharge spinning and during normal spinning performed after yarn discharge spinning. The circumferential speed of the yarn accumulating roller is different between the yarn discharging spinning time and the normal spinning time.

  According to another aspect of the present invention, the spinning machine increases or decreases the peripheral speed of the front roller in a period from the end of yarn discharge spinning to the start of normal spinning. In addition, the peripheral speed of the yarn accumulating roller is increased or decreased during the period from the end of yarn discharge spinning to the start of normal spinning.

  By changing the peripheral speed of the front roller during yarn spinning and normal spinning, a spinning speed suitable for yarn spinning can be used during yarn spinning, and a spinning speed suitable for normal spinning can be used during normal spinning. . Thereby, the productivity can be improved without reducing the success rate of the yarn discharge spinning. Further, by changing not only the peripheral speed of the front roller but also the peripheral speed of the yarn accumulating roller, it is possible to prevent yarn breakage or yarn slack due to a change in the peripheral speed of the front roller.

  In the spinning machine, it is preferable that the yarn accumulating roller is disposed so as to draw out the yarn from the pneumatic spinning device and store the yarn.

  In the delivery rollerless spinning machine, the yarn accumulating roller pulls the yarn from the pneumatic spinning device. Therefore, by changing the circumferential speed of the yarn accumulating roller, it is possible to more reliably prevent yarn breakage or yarn slack due to a change in the circumferential speed of the front roller.

  The spinning machine preferably includes a first driving unit that rotationally drives the front roller, and a second driving unit that rotationally drives the yarn accumulating roller.

  Accordingly, the front roller and the yarn accumulating roller can be driven at different peripheral speeds with a simple configuration without using a reduction gear or the like.

  The spinning machine includes a plurality of spinning units. Each of the plurality of spinning units includes the first driving unit and the second driving unit. The first drive unit and the second drive unit of the spinning unit can be driven with respect to the first drive unit and the second drive unit of the other spinning units.

  Thereby, the peripheral speeds of the front roller and the yarn accumulating roller can be controlled independently for each spinning unit. Therefore, a spinning unit performing normal spinning can wind at a peripheral speed suitable for normal spinning, and a spinning unit performing yarn discharge spinning can perform winding at a peripheral speed suitable for yarn spinning. .

  In the spinning machine, the peripheral speed of the front roller at the time of yarn discharge spinning is slower than the peripheral speed of the front roller at the time of normal spinning, and the peripheral speed of the yarn storage roller at the time of yarn discharge spinning is It is preferably slower than the peripheral speed of the yarn accumulating roller during normal spinning.

  As a result, when spinning under general spinning conditions, productivity can be improved without reducing the success rate of yarn discharge spinning.

  In the spinning machine, the change mode of the peripheral speed of the front roller and the change mode of the peripheral speed of the yarn accumulating roller are the same in a period from the end of the yarn discharge spinning to the start of the normal spinning. Is preferred.

  As a result, yarn breakage or yarn slack associated with a change in the peripheral speed of the front roller can be more reliably prevented.

  The spinning machine sets a change rate of the peripheral speed of the front roller and a change rate of the peripheral speed of the yarn accumulating roller in a period from the end of the yarn discharge spinning to the start of the normal spinning. It is preferable to provide.

  Thereby, it is possible to adjust the rate of change in the peripheral speed in consideration of the time taken from the yarn discharge spinning to the start of normal spinning, the load applied to the yarn, and the like.

  In the spinning machine, it is preferable that a ratio of a circumferential speed of the front roller and a circumferential speed of the yarn accumulating roller is different between the yarn discharging spinning time and the normal spinning time.

  As a result, the fiber bundle can be drafted and the yarn can be pulled out from the pneumatic spinning device at an appropriate ratio of peripheral speeds according to the yarn count, spinning speed, and the like.

  In the spinning machine, the draft roller of the draft device includes a second roller disposed second from the downstream. The peripheral speed of the second roller is different between the yarn spinning and the normal spinning.

  By changing the peripheral speed of the second roller, for example, the draft ratio between the second roller and the front roller can be changed. Therefore, the amount of fibers in the fiber bundle conveyed in the draft device can be adjusted.

  The spinning machine preferably includes a third driving unit that drives the second roller.

  Accordingly, the peripheral speeds of the front roller and the second roller can be individually changed with a simple configuration without using a reduction gear or the like.

  In the spinning machine, the circumferential speed of the front roller and the circumferential speed of the second roller change during the period from the end of the yarn discharge spinning to the start of the normal spinning, and the circumferential speed of the front roller. It is preferable that the ratio of the peripheral speed of the second roller changes.

  As a result, the front roller and the second roller are driven at a peripheral speed suitable for yarn discharge spinning during yarn discharge spinning, and the front roller and the second roller are driven at a ratio of peripheral speeds suitable for normal spinning during normal spinning. it can.

  The spinning machine preferably includes a control unit that controls at least the draft device and the yarn accumulating roller.

  Thereby, since many members are controlled by the single control part, control can be performed smoothly.

  According to the second aspect of the present invention, the spinning method includes an air spinning device that performs spinning to generate the yarn by twisting the fiber bundle at a peripheral speed of a front roller included in a draft device that drafts the fiber bundle. Is different between when yarn spinning is performed to perform yarn ejection spinning, and when normal spinning is performed by the air spinning device 9 after the yarn ejection spinning, and the yarn generated by the pneumatic spinning device is wound around the surface and stored. The circumferential speed of the storage roller is made different between the yarn discharging spinning time and the normal spinning time.

  Thereby, the productivity can be improved without reducing the success rate of the yarn discharge spinning. Further, by changing not only the peripheral speed of the front roller but also the peripheral speed of the yarn accumulating roller, it is possible to prevent yarn breakage or yarn slack due to a change in the peripheral speed of the front roller.

The side view which shows the structure of the spinning unit with which the spinning machine which concerns on one Embodiment of this invention is provided. Sectional drawing which shows the structure inside a pneumatic spinning apparatus. The expansion perspective view which shows the shape of a thread | yarn storage apparatus and a 1st guide. The side view which shows the structure of the spinning unit when performing the yarn splicing and the yarn discharging spinning. The graph which shows an example of the change of the circumferential speed and circumferential speed ratio of a thread | yarn storage roller and a front roller. The graph which shows an example of the change of the peripheral speed and peripheral speed ratio of a front roller and a middle roller. The table | surface which shows the content set to a setting part.

  Next, a spinning machine (spinning machine) according to an embodiment of the present invention will be described with reference to the drawings. In this specification, “upstream” and “downstream” mean upstream and downstream in the traveling direction of the fiber bundle and spun yarn during spinning.

  The spinning machine includes a large number of spinning units 2 arranged side by side and a machine control device 5 that centrally manages the spinning units. The machine base control device 5 is provided with a setting unit 6 for setting spinning conditions (such as the yarn count and spinning speed of the spun yarn 10). Each spinning unit 2 produces a spun yarn 10 by spinning the fiber bundle 8 sent from the draft device 7 by the air spinning device 9, and winds the spun yarn 10 by the take-up unit 26 to form a package 50. To do.

  As shown in FIG. 1, each spinning unit 2 includes a draft device 7, an air spinning device 9, a yarn storage device 22, a yarn joining device 23, and a yarn monitoring device arranged in order from upstream to downstream. 25 and a winding unit 26. Each unit included in the spinning unit 2 is controlled by a unit controller (control unit) 90 provided in the spinning unit 2. However, each unit included in the spinning unit 2 may be controlled by the machine control device 5.

  The draft device 7 includes four draft rollers: a back roller 16, a third roller 17, a middle roller (second roller) 19 on which a rubber apron belt 18 is mounted, and a front roller 20 in this order from the upstream side. Each draft roller is rotationally driven at a predetermined rotational speed. The draft device 7 has opposing rollers arranged to face each draft roller.

  The draft device 7 drives a front drive unit (first drive unit) 91 that drives the front roller 20, a middle drive unit (third drive unit) 92 that drives the middle roller 19, and the third roller 17 and the back roller 16. An upstream drive unit 93. Each drive part is comprised by the motor (for example, brushless motor) which can change a rotational speed according to the control signal of the unit controller 90. FIG. Since the spinning machine includes a front drive unit 91, a middle drive unit 92, and an upstream drive unit 93 for each spinning unit 2, the rotational speed of each draft roller can be controlled independently for each spinning unit 2. Note that the draft rollers of the plurality of spinning units 2 may be driven at the same time by using a common drive source for the plurality of spinning units 2. In the present embodiment, the third roller 17 and the back roller 16 are driven by a single drive source (upstream drive unit 93). However, the third roller 17 and the back roller 16 may be driven by another drive source. .

  The draft device 7 sandwiches and conveys a sliver 15 supplied from a sliver case (not shown) via a sliver guide between a plurality of draft rollers and a plurality of opposing rollers, thereby a predetermined fiber amount (or The fiber bundle 8 is drawn (draft) until it becomes (thickness). A regulating member 21 is disposed between the third roller 17 and the middle roller 19. A through hole is formed in the regulating member 21. The drafted sliver 15 passes through the through hole of the regulating member 21, so that the width of the sliver 15 is regulated.

  An air spinning device 9 is disposed immediately downstream of the front roller 20. The air spinning device 9 twists the fiber bundle 8 supplied from the draft device 7 to generate a spun yarn 10. In this embodiment, a pneumatic spinning device that twists the fiber bundle 8 using a swirling air flow is employed. As shown in FIG. 2, the pneumatic spinning device 9 includes a nozzle block 30 and a hollow guide shaft body 34. The nozzle block 30 includes a fiber guide 31, a spinning chamber 32, and a first nozzle 33. The hollow guide shaft body 34 includes a yarn passage 35 and a second nozzle 36. Each part of the pneumatic spinning device 9 is controlled by a unit controller 90.

  The fiber guide 31 guides the fiber bundle 8 drafted by the draft device 7 toward the inside of the pneumatic spinning device 9. The fiber guide 31 is formed with a fiber inlet 31a and a guide needle 31b. The fiber bundle 8 drafted by the draft device 7 is introduced from the fiber introduction port 31a and guided into the spinning chamber 32 so as to be wound around the guide needle 31b. When air is injected from the first nozzle 33 into the spinning chamber 32, a swirling air flow is generated in the spinning chamber 32. Thereby, a swirling air flow acts on the fiber bundle 8 in the spinning chamber 32.

  The hollow guide shaft body 34 is a cylindrical member, and a yarn passage 35 is formed therein. Air is injected from the second nozzle 36 into the yarn passage 35, whereby a swirling air flow is generated in the yarn passage 35. The direction of the swirling air flow generated by the air ejected from the second nozzle 36 is opposite to the swirling air flow generated by the air ejected from the first nozzle 33.

  When performing yarn discharge spinning, air is jetted from both the first nozzle 33 and the second nozzle 36 to generate a swirling air flow. The fiber bundle 8 drafted by the draft device 7 is guided inside the pneumatic spinning device 9 by the fiber guide 31. The air injected from the first nozzle 33 flows in the feeding direction of the fiber bundle 8 while swirling. Thereby, the fiber bundle 8 is sent to the hollow guide shaft body 34 in a loose false twist state.

  Since the yarn passage 35 is formed such that the cross-sectional area on the downstream side is larger than the cross-sectional area on the upstream side, the swirling air flow flows toward the downstream side in the yarn passage 35. Thereby, the fiber bundle 8 can be sent to the downstream side of the yarn passage 35. Since the direction of the swirling air flow generated in the yarn passage 35 is opposite to that of the swirling air flow in the spinning chamber 32, the fiber bundle 8 is spun into a bundled fiber by a known spinning method. It is discharged from the body 34.

  Normal spinning is performed after spinning out the yarn. When normal spinning is performed, a swirling air flow is generated in the spinning chamber 32 by injecting air only from the first nozzle 33. That is, when shifting from yarn spinning to normal spinning (at the time of transition), air is injected from the second nozzle 36, but when performing normal spinning, air is not injected from the second nozzle 36. The rear end of the fiber of the fiber bundle 8 supplied from the draft device 7 is swung around the front end of the hollow guide shaft 34 by the swirling air flow generated in the spinning chamber 32. Thereby, twist is added to the fiber bundle 8 and the spun yarn 10 is produced | generated. The spun yarn 10 is sent to the outside of the pneumatic spinning device 9 from a downstream yarn outlet (not shown) through a yarn passage 35 of the hollow guide shaft 34.

  As described above, the spun yarn 10 can be generated by twisting the fiber bundle 8 at the time of yarn discharge spinning and normal spinning.

  A first guide 61 (guide member, FIG. 3) for guiding the spun yarn 10 is disposed downstream of the pneumatic spinning device 9. The first guide 61 guides the spun yarn 10 to the yarn storage device 22. The first guide 61 is movable to draw the spun yarn 10 to the yarn accumulating device 22 when performing yarn splicing or the like.

  A yarn storage device 22 is provided downstream of the first guide 61. The yarn storage device 22 includes a yarn storage roller 41, a roller driving unit (second driving unit) 42, a yarn hooking member 43, and a yarn amount detection sensor 44. The roller driving unit 42 is a motor that rotationally drives the yarn accumulating roller 41. The roller driving unit 42 is a motor (for example, a stepping motor) that can change the rotation speed in accordance with a control signal from the unit controller 90. As the roller drive unit 42 rotates the yarn accumulating roller 41, the spun yarn 10 is wound around the surface of the yarn accumulating roller 41. As a result, the spun yarn 10 can be temporarily stored in the yarn storage roller 41.

  A yarn hooking member 43 is attached to the downstream end of the yarn accumulating roller 41. The yarn hooking member 43 is supported so as to be rotatable relative to the yarn accumulating roller 41. A permanent magnet is attached to either the yarn hooking member 43 or the yarn accumulating roller 41, and a magnetic hysteresis material is attached to the other. By these magnetic means, a torque is generated that resists the yarn hooking member 43 from rotating relative to the yarn accumulating roller 41. Therefore, only when a force that overcomes this torque is applied to the yarn hooking member 43 (when a predetermined or higher yarn tension is applied), the yarn hooking member 43 rotates relative to the yarn accumulating roller 41, and The spun yarn 10 wound around the yarn accumulating roller 41 can be unwound. When the force overcoming this torque is not applied to the yarn hooking member 43, the yarn storage roller 41 and the yarn hooking member 43 rotate integrally, and the spun yarn 10 is stored in the yarn storage roller 41.

  In this way, the yarn storage device 22 unwinds the spun yarn 10 when the downstream yarn tension increases, and stops the disentanglement of the spun yarn 10 when the yarn tension decreases (the spun yarn 10 is likely to loosen). To work. Thereby, the yarn accumulating device 22 can eliminate the slackness of the spun yarn 10 and apply an appropriate tension to the spun yarn 10. Further, the yarn hooking member 43 operates so as to absorb the fluctuation of the tension applied to the spun yarn 10 between the yarn accumulating device 22 and the winding unit 26 as described above. It is possible to prevent the spun yarn 10 between 9 and the yarn storage device 22 from being affected.

  The yarn amount detection sensor 44 is an optical sensor and detects whether or not the storage amount of the yarn storage device 22 is greater than or equal to a predetermined value.

  A second guide 62 that suppresses the behavior of the spun yarn 10 unwound from the yarn storage roller 41 is provided downstream of the yarn storage roller 41. A yarn joining device 23 is provided downstream of the second guide 62. When the spun yarn 10 between the pneumatic spinning device 9 and the package 50 is in a divided state for some reason, the yarn splicing device 23 is connected to the spun yarn 10 (first yarn) from the pneumatic spinning device 9 and the package 50. The spun yarn 10 (second yarn) is spliced. In the present embodiment, the yarn joining device 23 is a splicer device that twists yarn ends together by a swirling air flow generated by compressed air. However, the yarn joining device 23 is not limited to the splicer device, and a mechanical knotter or the like can be employed, for example.

  The spinning unit 2 includes a catching guide device that guides the spun yarn 10 to the yarn joining device 23. The catching and guiding device includes a first catching and guiding device 27 that guides the first yarn and a second catching and guiding device 28 that guides the second yarn.

  The base part of the first catching and guiding device 27 is rotatably supported, and the first catching and guiding device 27 can be rotated in the vertical direction with the base part as a rotation center. The first catching and guiding device 27 is configured in a hollow shape and is connected to a blower (not shown), and can generate a suction air flow. The first catching and guiding device 27 can catch the yarn end of the first yarn by rotating downward (see FIG. 4). The first catching and guiding device 27 can guide the first yarn to the yarn joining device 23 by turning upward after catching the first yarn.

  The second catching and guiding device 28 is rotatably supported at the base portion, and can be rotated in the vertical direction with the base portion as a rotation center. The second catching and guiding device 28 is also configured in a hollow shape and is connected to a blower (not shown), and can generate a suction air flow. The second catching and guiding device 28 can catch the yarn end of the second yarn by rotating upward (see FIG. 4). The second catching and guiding device 28 can guide the second yarn to the yarn joining device 23 by turning downward after catching the second yarn.

  By driving the yarn joining device 23 in a state where the first yarn and the second yarn are guided to the yarn joining device 23, the first yarn (spun yarn 10 generated by normal spinning) and the second yarn are joined. Then, the spun yarn 10 is brought into a continuous state between the air spinning device 9 and the package 50. Thereby, winding of the spun yarn 10 around the package 50 can be resumed.

  A yarn monitoring device 25 is provided downstream of the yarn joining device 23. The yarn monitoring device 25 monitors the thickness of the traveling spun yarn 10 with a light transmission sensor (not shown). The yarn monitoring device 25 transmits a yarn defect detection signal to the unit controller 90 when detecting a yarn defect of the spun yarn 10 (a portion where the thickness of the spun yarn 10 is abnormal). When the unit controller 90 receives the yarn defect detection signal, the unit controller 90 drives the cutter 24 disposed in the vicinity of the yarn monitoring device 25 to cut the spun yarn 10. Note that the yarn monitoring device 25 is not limited to a light transmission type sensor, but may monitor the thickness of the spun yarn 10 with a capacitance type sensor, for example. Moreover, you may monitor the foreign material contained in the spun yarn 10 as a yarn defect. The cutter 24 may be provided in the yarn monitoring device 25. Further, the spun yarn 10 may be cut by omitting the cutter 24 and stopping spinning by the pneumatic spinning device 9. When the spinning due to the yarn breakage and / or the yarn cutting is interrupted, the rotation of the yarn accumulating roller 41 is decelerated and stopped after the spinning by the pneumatic spinning device 9 is stopped.

  A winding unit 26 is disposed downstream of the yarn storage device 22. The winding unit 26 includes a cradle arm 52 and a winding drum 53. The yarn path from the yarn storage device 22 to the winding unit 26 is bent and guided by the downstream guide 63.

  The cradle arm 52 can rotatably support a winding tube 51 for winding the spun yarn 10. The cradle arm 52 can be rotated with its root portion as the rotation center. Thereby, even if the spun yarn 10 is wound around the take-up tube 51 and the diameter of the package 50 is increased, the take-up of the spun yarn 10 can be appropriately continued.

  The winding drum 53 rotates while being in contact with the winding pipe 51 or the outer peripheral surface of the package 50 by transmitting a driving force of a winding drum drive motor (not shown). A traverse groove (not shown) is formed on the outer peripheral surface of the winding drum 53, and the spun yarn 10 can be traversed with a predetermined width by the traverse groove. Thus, the winding unit 26 can form the package 50 by winding the spun yarn 10 around the winding tube 51 while traversing the spun yarn 10.

  Next, processing performed by the spinning unit 2 when shifting from the yarn spinning to the normal spinning will be described with reference to FIGS. 4 to 7.

  When spinning is newly started or when spinning is temporarily interrupted due to yarn breakage or the like (in other words, when it is necessary to newly send the spun yarn 10 from the pneumatic spinning device 9), pneumatic spinning The device 9 performs yarn discharge spinning. The spun yarn 10 generated by the yarn spinning by the pneumatic spinning device 9 is guided to the yarn joining device 23 by the first catching and guiding device 27 as shown in FIG. Thereafter, the spun yarn 10 generated by the pneumatic spinning device 9 is guided to the vicinity of the yarn accumulating device 22 by the first guide 61. As a result, the yarn hooking member 43 of the yarn accumulating device 22 is able to hook and rotate the spun yarn 10.

  As a result, the yarn storage device 22 pulls out the spun yarn 10 from the pneumatic spinning device 9 and stores the spun yarn 10 in the yarn storage roller 41. When a predetermined amount or more of the spun yarn 10 is stored in the yarn storage roller 41, the yarn amount detection sensor 44 detects that fact. The spinning unit 2 performs a process of shifting from yarn discharge spinning to normal spinning at the timing when the yarn amount detection sensor 44 detects the spun yarn 10. The timing for shifting from yarn discharge spinning to normal spinning may be determined using a device other than the yarn amount detection sensor 44. For example, a yarn detection sensor may be disposed inside the first catching and guiding device 27, and at the timing when the yarn detection sensor detects the spun yarn 10, a transition may be made from yarn discharge spinning to normal spinning.

  In the present embodiment, the spinning unit 2 performs the circumferential speeds of the yarn accumulating roller 41, the front roller 20, and the middle roller 19 during a yarn discharge spinning and a normal spinning (one point on the outer circumference of the roller per predetermined time). Control to vary the distance traveled. In particular, in this embodiment, since the peripheral speeds of the front roller 20, the middle roller 19, and the yarn accumulating roller 41 can be controlled independently for each spinning unit 2, the spinning unit 2 that performs normal spinning is suitable for normal spinning. The spinning unit 2 that performs winding at the peripheral speed and performs spinning out at the circumferential speed performs winding at a peripheral speed suitable for spinning out the yarn.

  FIG. 5A is a graph showing an example of a change in the peripheral speed of the yarn accumulating roller 41. FIG. 5B is a graph showing an example of a change in the peripheral speed of the front roller 20. In the examples shown in FIGS. 5A and 5B, the peripheral speeds of the yarn accumulating roller 41 and the front roller 20 are constant at the time of yarn discharge spinning, and gradually increase at the time of transition. At the time of normal spinning, the peripheral speeds of the front roller 20 and the yarn accumulating roller 41 become constant again at a higher speed than at the time of yarn discharge spinning. In FIGS. 5A and 5B, the acceleration of the yarn accumulating roller 41 and the front roller 20 at the time of transition is constant, but the acceleration may be changed.

  Although it depends on the spinning conditions, in general, when performing yarn discharge spinning at a spinning speed of a predetermined speed or higher, the success rate may decrease. However, if spinning is performed at a lower spinning speed, productivity will be reduced during normal spinning. Therefore, as shown in FIG. 5, by increasing the peripheral speed at the time of transition, it is possible to improve productivity while preventing a decrease in the success rate of yarn discharge spinning.

  The yarn accumulating roller 41 winds up the spun yarn 10 generated by the pneumatic spinning device 9. Therefore, when the peripheral speed of the yarn accumulating roller 41 is faster than the peripheral speed of the front roller 20, excessive tension is applied to the spun yarn 10 and the spun yarn 10 is cut. When the peripheral speed of the yarn accumulating roller 41 is slower than the peripheral speed of the front roller 20, the spun yarn 10 is loosened. In the spinning unit 2, the change mode of the peripheral speed of the yarn accumulating roller 41 at the time of transition (how the peripheral speed changes) and the change mode of the peripheral speed of the front roller 20 are the same. In other words, in the spinning unit 2, the front driving unit 91 and the roller driving unit 42 are controlled so that the circumferential speeds of the yarn accumulating roller 41 and the front roller 20 are synchronized with each other. In the present specification, a mode in which the circumferential speeds of the yarn accumulating roller 41 and the front roller 20 are changed to such an extent that the spun yarn 10 is not cut or slackened corresponds to the “same change mode”.

  FIG. 5C is a graph showing a change in the peripheral speed ratio (first peripheral speed ratio, feed rate) of the yarn accumulating roller 41 with respect to the front roller 20. In order to prevent yarn breakage and loosening of the spun yarn 10, the first circumferential speed ratio is preferably close to 1. However, the first circumferential speed ratio may be preferably larger or smaller than 1 depending on the yarn count, spinning speed, target yarn specification, and the like. In the example shown in FIG. 5C, the first peripheral speed ratio at the time of yarn discharge spinning is made larger than 1, and the first peripheral speed ratio at the time of normal spinning is made smaller than 1.

  Instead of the example shown in FIGS. 5A and 5B, the peripheral speeds of the front roller 20 and the yarn accumulating roller 41 may be decreased at the time of transition. Instead of the example shown in FIG. 5 (c), the first circumferential speed ratio during yarn discharge spinning may be made smaller than 1, and the first circumferential speed ratio during normal spinning may be made larger than 1.

  FIG. 6A is a graph showing an example of a change in the peripheral speed of the front roller 20. FIG. 6B is a graph showing an example of a change in the peripheral speed of the middle roller 19. In the example shown in FIG. 6B, the peripheral speed of the middle roller 19 is constant at the time of yarn discharge spinning, gradually increases at the time of transition, and at a higher speed than at the time of yarn discharge spinning at the time of normal spinning. It becomes constant again.

  In general, the success rate at the time of yarn discharge spinning also depends on the amount of fibers of the fiber bundle 8 supplied to the pneumatic spinning device 9. Therefore, for example, a method of adjusting the fiber amount of the fiber bundle 8 supplied to the pneumatic spinning device 9 by changing the peripheral speeds of the back roller 16 and the third roller 17 at the time of spinning out the yarn can be considered. However, since the peripheral speeds of the back roller 16 and the third roller 17 are relatively slow, even if the amount of change in the peripheral speed is slight, the amount of fiber of the fiber bundle 8 supplied to the pneumatic spinning device 9 changes significantly. As a result, the success rate of yarn discharge spinning decreases. In this case, the fiber amount of the fiber bundle 8 supplied to the middle roller 19 also changes significantly. Therefore, for example, when the fiber amount of the fiber bundle 8 supplied to the middle roller 19 increases, the fiber bundle 8 may be caught by the regulating member 21 disposed between the third roller 17 and the middle roller 19.

  In the present embodiment, the amount of the fiber bundle 8 supplied to the pneumatic spinning device 9 is adjusted by changing the peripheral speed ratio (second peripheral speed ratio, main draft ratio) of the front roller 20 with respect to the middle roller 19. The spinning unit 2 controls the front drive unit 91 and the middle drive unit 92 so that a predetermined second circumferential speed ratio is realized. As a result, even if the peripheral speed of the front roller 20 or the middle roller 19 slightly deviates from the set value, the fiber amount of the fiber bundle 8 supplied to the pneumatic spinning device 9 and the like is prevented from changing significantly. it can.

  As described above, since it is preferable to increase the spinning speed during normal spinning, the spinning unit 2 increases the speeds of the front roller 20 and the middle roller 19 during transition. Further, the preferred value of the second circumferential speed ratio is different between yarn spinning and normal spinning. Therefore, the spinning unit 2 changes the peripheral speeds of the front roller 20 and the middle roller 19 so that a preferable second peripheral speed ratio is realized based on the count of the spun yarn 10 and the like. In the example shown in FIG. 6C, the peripheral speeds of the front roller 20 and the middle roller 19 are changed so that the second peripheral speed ratio during normal spinning is larger than the second peripheral speed ratio during yarn discharge spinning. .

  Instead of the example shown in FIGS. 6A and 6B, the peripheral speeds of the front roller 20 and the middle roller 19 may be decreased at the time of transition. Instead of the example shown in FIG. 6C, the second circumferential speed ratio during normal spinning may be made smaller than the second circumferential speed ratio during yarn discharge spinning.

  Thus, in this embodiment, the circumferential speeds of the yarn accumulating roller 41, the front roller 20, and the middle roller 19 are changed. These peripheral speeds can be set automatically based on the input spinning conditions or the like, but can also be set by the operator. The operator can designate the peripheral speed of each roller by inputting a predetermined value to the setting unit 6 of the machine base control device 5.

  FIG. 7 is a table showing contents that can be set in the setting unit 6. As shown in FIG. 7, setting items are provided for each of yarn spinning, transition, and normal spinning.

  As setting items at the time of yarn discharge spinning and normal spinning, in addition to the circumferential speeds of the yarn accumulating roller 41, the front roller 20, and the middle roller 19, a first circumferential speed ratio and a second circumferential speed ratio are provided. The operator selects a setting item and inputs a desired value to set the peripheral speed or the peripheral speed ratio. Note that when any two of the circumferential speed of the yarn accumulating roller 41, the circumferential speed of the front roller 20, and the first circumferential speed ratio are determined, the remaining one is automatically input. The same applies to the front roller 20, the middle roller 19, and the second peripheral speed ratio.

  As setting items at the time of transition, speed change rates of the yarn accumulating roller 41, the front roller 20, and the middle roller 19 are provided. The speed change rate is a value indicating at what acceleration the peripheral speed of the yarn accumulating roller 41 or the like is changed (or how much time is required to shift from yarn discharge spinning to normal spinning). When the first peripheral speed ratio or the second peripheral speed ratio is greatly increased or decreased, as described above, a situation such as thread breakage, thread slack, and a significant increase or decrease in the amount of fibers in the fiber bundle 8 occurs. In order to prevent this situation, in the present embodiment, one speed change rate is set for the yarn accumulating roller 41, the front roller 20, and the middle roller 19.

  For the setting items, a specific value may be input by the operator, or the operator may select a desired level from a plurality of levels. By setting a large number of setting items as described above, winding can be performed under appropriate conditions according to the yarn count of the spun yarn 10, the target yarn specification, and the like.

  As described above, the spinning machine includes the draft device 7, the air spinning device 9, and the yarn accumulating roller 41. The draft device 7 has a plurality of draft rollers including a front roller 20 and drafts the fiber bundle 8. The pneumatic spinning device 9 performs spinning to produce a spun yarn 10 by twisting the fiber bundle 8 drafted by the draft device 7. The yarn storage roller 41 winds and stores the spun yarn 10 generated by the pneumatic spinning device 9 around the surface. The peripheral speed of the front roller 20 is different during yarn discharge spinning and during normal spinning performed after the yarn discharge spinning. The circumferential speed of the yarn accumulating roller 41 is different between yarn discharge spinning and normal spinning. In other words, the spinning machine increases or decreases the peripheral speed of the front roller 20 and increases or decreases the peripheral speed of the yarn accumulating roller 41 during the period from the end of yarn discharge spinning to the start of normal spinning. Let

  Thereby, the productivity can be improved without reducing the success rate of the yarn discharge spinning. Further, by changing not only the circumferential speed of the front roller 20 but also the circumferential speed of the yarn accumulating roller 41, yarn breakage or yarn slack due to a change in the circumferential speed of the front roller 20 can be prevented.

  In the spinning machine of this embodiment, the change mode of the peripheral speed of the front roller 20 and the change speed of the peripheral speed of the yarn accumulating roller 41 are the same in the period from the end of yarn discharge spinning to the start of normal spinning.

  As a result, yarn breakage or yarn slack associated with a change in the peripheral speed of the front roller 20 can be more reliably prevented.

  In the spinning machine of the present embodiment, the draft device 7 includes a middle roller 19 disposed second from the downstream. The peripheral speed of the middle roller 19 is different between yarn spinning and normal spinning.

  By changing the peripheral speed of the middle roller 19, for example, the draft ratio between the middle roller 19 and the front roller 20 can be changed. Therefore, the fiber amount of the fiber bundle 8 to be conveyed can be adjusted. Unlike the case where the fiber amount of the fiber bundle 8 is adjusted by the back roller 16 or the like, the increase / decrease amount of the fiber amount of the fiber bundle 8 can be suppressed. Therefore, the fiber bundle 8 can be prevented from being caught by the regulating member 21.

  The preferred embodiment of the present invention has been described above, but the above configuration can be modified as follows, for example.

  In the above embodiment, the yarn accumulating roller 41, the front roller 20, and the middle roller 19 are driven by different driving units. However, by using a reduction gear or the like, at least two of the above can be driven by the same drive unit.

  The setting unit 6 may be provided in the machine control device 5 as in the above embodiment, or may be provided for each spinning unit 2. A control unit for controlling each drive unit may be provided in the machine base control device 5, may be provided for each spinning unit 2, or may be provided for each drive unit.

  In the above embodiment, the present invention is applied to a spinning machine in which the package 50 is formed above the spinning unit 2, but a spinning machine having a configuration in which the package 50 is formed below the spinning unit 2 (Japanese Patent Application Laid-Open No. 2010-77576, etc.). ) Can also be applied to the present invention.

2 Spinning unit 6 Setting unit 7 Draft device 9 Pneumatic spinning device 16 Back roller 17 Third roller 19 Middle roller (second roller)
20 Front roller 41 Yarn accumulating roller 42 Roller drive unit (second drive unit)
90 Unit controller (control unit)
91 Front drive unit (first drive unit)
92 Middle drive (third drive)
93 Upstream drive

Claims (14)

A draft device having a plurality of draft rollers including a front roller and drafting a fiber bundle;
An air spinning device for performing spinning to produce a yarn by twisting the fiber bundle drafted by the draft device;
A yarn storage roller that winds and stores the yarn generated by the pneumatic spinning device,
With
The peripheral speed of the front roller is different between the yarn spinning and the normal spinning performed after the yarn spinning,
A spinning machine characterized in that a circumferential speed of the yarn accumulating roller is different between the yarn discharging spinning time and the normal spinning time. A draft device having a plurality of draft rollers including a front roller and drafting a fiber bundle;
An air spinning device for performing spinning to produce a yarn by twisting the fiber bundle drafted by the draft device;
A yarn storage roller that winds and stores the yarn generated by the pneumatic spinning device,
With
In the period between the end of yarn spinning and the start of normal spinning, the peripheral speed of the front roller is increased or decreased,
A spinning machine characterized by increasing or decreasing the peripheral speed of the yarn accumulating roller in a period from the end of yarn discharge spinning to the start of normal spinning. The spinning machine according to claim 1 or 2,
The spinning machine according to claim 1, wherein the yarn storage roller is disposed so as to draw out the yarn from the pneumatic spinning device and store the yarn. The spinning machine according to any one of claims 1 to 3,
A first drive unit that rotationally drives the front roller;
A second drive unit that rotationally drives the yarn storage roller;
A spinning machine characterized by comprising: The spinning machine according to claim 4, wherein
With multiple spinning units,
Each of the plurality of spinning units includes the first driving unit and the second driving unit,
The spinning unit characterized in that the first driving unit and the second driving unit of the spinning unit can be driven independently of the first driving unit and the second driving unit of the other spinning units. Machine. The spinning machine according to any one of claims 1 to 5,
The peripheral speed of the front roller at the time of spinning out the yarn is slower than the peripheral speed of the front roller at the time of normal spinning,
A spinning machine characterized in that a peripheral speed of the yarn accumulating roller at the time of yarn discharge spinning is slower than a peripheral speed of the yarn accumulating roller at the time of normal spinning. The spinning machine according to any one of claims 1 to 6,
The spinning machine characterized in that the change mode of the peripheral speed of the front roller and the change mode of the peripheral speed of the yarn accumulating roller are the same in a period from the end of the yarn discharge spinning to the start of the normal spinning. . The spinning machine according to claim 7, wherein
A setting unit is provided for setting a change rate of a peripheral speed of the front roller and a change rate of a peripheral speed of the yarn accumulating roller in a period from the end of the yarn discharge spinning to the start of the normal spinning. Spinning machine. The spinning machine according to any one of claims 1 to 8,
The spinning machine according to claim 1, wherein a ratio of a circumferential speed of the front roller and a circumferential speed of the yarn accumulating roller is different between the yarn discharging spinning time and the normal spinning time. The spinning machine according to any one of claims 1 to 9,
The draft roller of the draft device includes a second roller arranged second from the downstream,
A spinning machine characterized in that the peripheral speed of the second roller is different between the yarn spinning and the normal spinning. The spinning machine according to claim 10, wherein
A spinning machine comprising a third drive unit for driving the second roller. The spinning machine according to claim 10 or 11,
In the period from the end of the yarn spinning to the start of the normal spinning, the peripheral speed of the front roller and the peripheral speed of the second roller change, and the peripheral speed of the front roller and the peripheral speed of the second roller A spinning machine characterized by a change in the ratio of peripheral speeds. The spinning machine according to any one of claims 1 to 12,
A spinning machine comprising a control unit that controls at least the draft device and the yarn accumulating roller. The peripheral speed of the front roller included in the draft device for drafting the fiber bundle is determined by the pneumatic spinning device that performs spinning to generate yarn by twisting the fiber bundle, and at the time of yarn delivery spinning in which yarn spinning is performed. Different from the normal spinning performed by the air spinning device later,
A spinning method characterized in that the circumferential speed of a yarn storage roller that winds and stores the yarn generated by the pneumatic spinning device is different between the yarn discharging spinning time and the normal spinning time.

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