JP2013067894A - Draft device and spinning machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a draft device that can stop a cradle at any spaced position, and a spinning machine having the device.SOLUTION: A draft device includes: a cradle 31 which rotatably supports a plurality of top rollers; a rotation shaft 33 allowing the cradle 31 to be freely rotated between at a contact position where the plurality of top rollers and a plurality of bottom rollers are in contact with each other and at a spaced position where at least one of the plurality of top rollers is spaced from the bottom rollers; and a holding part TL which holds the cradle 31 at the spaced position of the cradle 31 when the cradle 31 is stopped at any spaced position during the rotating operation.

Description

  The present invention relates to a draft device and a spinning machine equipped with the draft device.

  2. Description of the Related Art Conventionally, spinning units and spinning machines are known that produce a spun yarn by drafting a fiber bundle with a draft device and twisting the drafted fiber bundle.

  The draft device includes a plurality of roller pairs such as a back roller pair, a middle roller pair, and a front roller pair from the upstream side to the downstream side in the draft direction of the fiber bundle. Each roller pair includes a bottom roller that is a driving roller and a top roller that rotates in contact with the bottom roller. Each top roller is integrally held by a draft cradle (hereinafter simply referred to as a cradle). Each bottom roller is integrally held by the apparatus frame.

  The cradle is rotatable with respect to the apparatus frame about the rotation axis. Therefore, by rotating the cradle, each top roller comes in contact with and separates from each bottom roller. A position where each cradle is closed and each top roller is in contact with each bottom roller is defined as a contact position, and a position where each cradle is opened for maintenance and the top rollers are separated from each bottom roller is defined as a separation position.

  The cradle is provided with a holding portion on the rotation shaft so that the cradle can be stopped at the separation position. A technique using a latch mechanism as a holding portion so that the cradle can be stopped at a plurality of spaced apart opening angles is also known (see, for example, Patent Document 1).

  However, in the conventional cradle, the latch mechanism operates only at the separation position with a predetermined opening angle, and therefore the cradle cannot be stopped at the separation position with an arbitrary opening angle. For this reason, it may not be possible to stop at a separation position with an opening angle suitable for work contents such as maintenance, and workability is low.

  In order to stop the cradle at the separation position, the cradle must be rotated to a predetermined opening angle at which the latch mechanism operates. However, even if the operator turns the cradle in the opening direction and thinks that the latch mechanism has been activated, the latch mechanism has not actually been reached because the predetermined opening angle has not been reached. Here, when the operator releases his hand from the cradle, the cradle closes. For this reason, the operator must perform the turning operation of the cradle while confirming whether or not the latch mechanism is activated.

  On the other hand, when the maintenance or the like is completed and the cradle is returned from the separated position to the contact position, it is necessary to release the latch mechanism. To release the latch mechanism, the cradle must be once rotated in the opening direction. Although this operation is an operation for closing the cradle, it is an operation that rotates in the opposite opening direction, which is unnatural for the operator.

  Further, once the latch mechanism is released, the latch mechanism does not operate unless the cradle is returned to the contact position. For this reason, when it is desired to change the cradle from the separated position with a large opening angle to the separated position with a small opening angle, the latch mechanism does not operate just by directly rotating the cradle in the closing direction, and the cradle is stopped at the separated position. I can't let you. In such a case, it is necessary to return the cradle from the separated position with a large opening angle to the contact position and then perform a rotation operation to open the cradle again to the separated position with a small opening angle.

JP 2008-45222 A

  The present invention has been made to solve the above problems. A first object of the present invention is to provide a draft device and a spinning machine capable of stopping a cradle at an arbitrary separation position. A second object of the present invention is to provide a draft device and a spinning machine that do not need to confirm whether or not the holding portion has been operated as in the case of a latch mechanism. A third object of the present invention is to provide a draft device and a spinning machine that can open and close the cradle with natural operations for the operator. The fourth object of the present invention is to move the cradle directly from the separation position having a large opening angle to the separation position having a small opening angle when the cradle is to be changed from the separation position having a large opening angle to a separation position having a small opening angle. It is an object of the present invention to provide a draft device and a spinning machine that can be made to operate.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

  That is, the draft device according to the first aspect includes a plurality of roller pairs including a top roller and a bottom roller for drafting the fiber bundle, and includes a cradle, a rotation shaft, and a holding portion. The cradle rotatably supports a plurality of top rollers. The rotation shaft allows the cradle to freely rotate between a contact position where the plurality of top rollers and the plurality of bottom rollers contact each other and a separation position where at least one of the plurality of top rollers is separated from the bottom roller. . The holding unit holds the cradle at the separated position when the cradle is stopped when the cradle is stopped at an arbitrary separated position in the rotation operation.

  A draft device according to a second aspect is the draft device according to the first aspect, wherein the holding portion is configured such that the cradle can move with respect to a force larger than a force with which the cradle moves to the contact position under its own weight. Has been.

  A draft device according to a third aspect of the present invention is the draft device according to the first or second aspect, wherein the holding portion is a torque limiter.

  A fourth invention is the draft device according to the third invention, wherein the torque limiter includes a sleeve, a collar, an inner spring, and an outer spring. The sleeve is fixed to the outer periphery of the rotation shaft. The collar is disposed on the outer periphery of the sleeve. The inner spring is disposed between the collar and the sleeve. The outer spring is disposed outside the collar and connected to the cradle. The torque limiter is configured such that when the cradle moves in a direction away from the contact position from the contact position or an arbitrary separation position, the outer spring is loosened and the collar does not move. In addition, when the cradle moves in a direction approaching the contact position from an arbitrary separation position, the torque limiter is tightened by the outer spring, and the inner spring is loosened with respect to the sleeve when a force is applied to the collar, and the inner spring and the collar And is configured to move.

  A fifth invention is the draft device according to any one of the first to fourth inventions, wherein the cradle is configured to support the top rollers of two rows of roller pairs capable of independently drafting fiber bundles. ing.

  A spinning machine according to a sixth aspect includes the draft device according to any one of the first to fifth aspects and an air spinning device. The pneumatic spinning device generates a spun yarn by spinning a fiber bundle drafted by a draft device with a swirling airflow.

  As effects of the present invention, the following effects can be obtained.

  According to the first aspect, the draft device includes the holding unit that holds the cradle at the separated position when the cradle is stopped when the cradle is stopped at the arbitrary separated position in the rotation operation. For this reason, a cradle can be stopped in arbitrary separation positions, and workability is good. Further, since the holding unit operates and the cradle stops even if the operator releases his hand from the cradle, there is no need to check whether the holding unit has operated as in the case of the latch mechanism. When returning the cradle from the separated position to the contact position, it is only necessary to rotate the cradle in the closing direction, so that the cradle can be opened and closed by a natural operation for the operator.

  According to the second invention, the holding portion is configured such that the cradle can move with respect to a force larger than the force with which the cradle moves to the contact position under its own weight. For this reason, when changing the cradle separation position in the direction in which the cradle opening angle is increased, the cradle is rotated in the opening direction and stopped at any separation position. Can be stopped. Even when the cradle separation position is changed in the direction in which the cradle opening angle is reduced, if the cradle is rotated in the closing direction and stopped at any separation position, the cradle is at the separation position. Can be stopped.

  According to the third invention, the holding portion is a torque limiter. Therefore, the cradle can be stopped at an arbitrary separation position with a simple configuration.

  According to the fourth invention, the torque limiter includes the sleeve, the collar, the inner spring, and the outer spring. The torque limiter is configured such that when the cradle moves in a direction away from the contact position from the contact position or an arbitrary separation position, the outer spring is loosened and the collar does not move. When the cradle moves in a direction approaching the contact position from an arbitrary separation position, the outer spring is squeezed, and when the force is applied to the collar, the inner spring is loosened with respect to the sleeve, and the inner spring and the collar are configured to move. ing. For this reason, the cradle can be reliably stopped at an arbitrary separation position by a torque limiter having a simple configuration.

  According to the fifth aspect of the invention, the cradle is configured to support the top rollers of the two rows of roller pairs capable of independently drafting the fiber bundle. For this reason, in a configuration in which two rows of fiber bundles are drafted, the top roller can be simultaneously stopped at an arbitrary position between the contact position and the separation position.

  According to the sixth aspect, the spinning machine includes the draft device and the air spinning device. In a spinning machine equipped with an air spinning device, the draft speed is generally high, and the frequency of opening and closing the cradle for maintenance or the like is relatively high. For this reason, by providing a cradle that can be reliably stopped at an arbitrary separation position, workability such as maintenance is improved, and operation efficiency of the spinning machine is improved.

The front view of the spinning machine M which concerns on embodiment of this invention. The side view of the spinning unit U is simplified. The side view of the draft device D in a contact position based on embodiment of this invention. FIG. 3 is a simplified plan view in which a part of the draft device D is broken. The exploded view of torque limiter TL. Sectional drawing explaining the operation state of torque limiter TL. It is sectional drawing in the AA of FIG. 4, (A) The figure which shows the state in which the cradle 31 exists in a contact position, (B) The figure which shows the state in which the cradle 31 exists in a separation position.

  Next, embodiments of the invention will be described with reference to the drawings.

  A draft device D and a spinning machine M according to a first embodiment of the present invention will be described with reference to FIGS.

  First, an outline of the spinning machine M will be described. In the present specification, “upstream” and “downstream” mean upstream and downstream in the traveling direction of the fiber bundle F and the spun yarn Y in the spinning unit U.

  As shown in FIGS. 1 and 2, the spinning machine M includes a plurality of spinning units U, a yarn splicing cart 3, a blower box 4, and a prime mover box 5. Each spinning unit U mainly includes a draft device D, a spinning device 11, a yarn clearer 12, a yarn slack eliminating device 13, and a winding device 21.

  As shown in FIG. 2, the draft device D drafts a fiber bundle (sliver) F supplied via a trumpet T from a can (not shown) arranged at the rear of the spinning unit U. The draft device D according to the present embodiment includes a plurality of roller pairs R whose feed speed is gradually increased from the upstream side to the downstream side of the fiber bundle F. The roller pair R includes top rollers RB1, RT1, RM1, and RF1 and bottom rollers RB2, RT2, RM2, and RF2 (see FIG. 3). The draft device D will be described in detail later.

  The spinning device 11 generates a spun yarn Y by twisting the fiber bundle F using a swirling airflow. Although the detailed description and illustration are omitted, the spinning device 11 includes a fiber guide portion, a swirl flow generating nozzle, and a hollow guide shaft body. The fiber guide unit guides the fiber bundle F sent from the draft device D to a spinning chamber formed inside the spinning device 11. The swirl flow generating nozzle is disposed around the path of the fiber bundle F and generates a swirl flow in the spinning chamber. By this swirl flow, the fiber ends of the fiber bundles F in the spinning chamber are reversed and swirled. The hollow guide shaft body guides the spun spun yarn Y from the spinning chamber to the outside of the spinning device 11. The driving and stopping of the spinning device are controlled by a unit controller (not shown). The spinning device 11 is an air spinning device that does not include a needle-like member and realizes the function of the needle-like member by the downstream end of the fiber guide portion, or a pair of air jet nozzles that twist in opposite directions. An air spinning device may be used.

  The yarn clearer 12 monitors the thickness of the spun yarn Y sent out from the spinning device 11. When the yarn clearer 12 detects a yarn defect of the spun yarn Y, it transmits a yarn defect detection signal to a unit controller (not shown). The yarn clearer 12 may be configured to detect the presence or absence of foreign matter contained in the spun yarn Y as a yarn defect.

  The yarn slack eliminating device 13 draws the spun yarn Y from the spun device 11 by applying a predetermined tension to the spun yarn Y. Further, the tension is adjusted so that the fluctuation of the tension on the winding device 21 side is not transmitted to the spinning device 11 side. When working with the yarn splicing carriage 3, the yarn slack eliminating device 13 retains the spun yarn Y sent from the spinning device 11 and prevents the spun yarn Y from slackening.

  The winding device 21 winds the spun yarn Y fed from the spinning device 11 and forms a package P. The winding device 21 includes a cradle arm 22, a winding drum 23, and a traverse device 24. The cradle arm 22 rotatably supports the package P (bobbin). The winding drum 23 contacts the outer peripheral surface of the package P (bobbin) and rotates the package P (bobbin). The traverse device 24 traverses the spun yarn Y. The winding device 21 rotates the winding drum 23 while traversing the spun yarn Y by the traverse device 24, thereby rotating the package P (bobbin) and winding the spun yarn Y. In FIG. 1, the winding device 21 is illustrated so as to wind up the cheese-shaped package P, but may be configured to wind up the cone-shaped package P.

  When the unit controller receives the yarn defect detection signal from the yarn clearer 12, the unit controller immediately cuts the spun yarn Y with the cutter 14, and further stops the draft device D, the spinning device 11, and the like. The unit controller sends a control signal to the yarn splicing carriage 3 and travels to the front of the spinning unit U. Thereafter, the unit controller drives the spinning device 11 and the like again, causes the yarn joining cart 3 to perform yarn joining, and resumes winding. The spinning unit U may not include the cutter 14 and may stop the generation of the spun yarn Y and stop the spun yarn Y by stopping the supply of air to the spinning device 11.

  As illustrated in FIGS. 1 and 2, the yarn splicing cart 3 includes a cart unit 25, a splicer 26 loaded on the cart unit 25, a suction pipe 27, and a suction mouth 28. The yarn splicing cart 3 travels to the spinning unit U when a yarn break or yarn cut occurs in a spinning unit U. The suction pipe 27 sucks and captures the yarn end fed from the spinning device 11 and guides it to the splicer 26. The suction mouse 28 sucks and picks up the yarn end from the package P and guides it to the splicer 26. The splicer 26 performs yarn splicing between the guided yarn ends.

  The blower box 4 has a blower (suction source) disposed therein. The blower box 4 is connected to a main pipe (not shown) which is a suction conveyance pipe common to the spinning units U. The main pipe is arranged at the rear part (upstream side in the draft direction) of each spinning unit U. The blower box 4 sucks, conveys, and collects fiber waste generated in each spinning unit U through the main pipe.

  In the prime mover box 5, a motor that is a prime mover of the spinning machine M, a speed reducer for transmitting power to each part of the spinning machine M, and the like are disposed inside.

  Next, the draft device D will be described in detail. As shown in FIGS. 3 and 4, the draft device D includes a plurality of roller pairs R, a cradle 31, and a device frame 32.

  As shown in FIG. 3, as the plurality of roller pairs R, in this embodiment, a back roller pair RB, a third roller pair RT, a middle roller pair RM, and a front roller pair RF are provided. These roller pairs RB, RT, RM, RF are arranged at a predetermined interval from the upstream side to the downstream side of the fiber bundle F. Each roller pair RB, RT, RM, RF is composed of upper top rollers RB1, RT1, RM1, RF1 and lower bottom rollers RB2, RT2, RM2, RF2. The bottom rollers RB2, RT2, RM2, and RF2 are driving rollers, and the top rollers RB1, RT1, RM1, and RF1 are driven rollers that are driven to rotate in contact with the bottom rollers RB2, RT2, RM2, and RF2. The rotational speed of each roller pair RB, RT, RM, RF increases gradually from the upstream side toward the downstream side. A spinning device 11 is disposed on the downstream side of the front roller pair RF.

  The back top roller RB1, the third top roller RT1, the middle top roller RM1, and the front top roller RF1 are integrally and rotatably mounted on the cradle 31. As shown in FIG. 4, the top rollers RB1, RT1, RM1, and RF1 for two spindles of the adjacent spinning unit U are mounted on the cradle 31. That is, the cradle 31 is configured to support the top rollers RB1, RT1, RM1, and RF1 of the two rows of roller pairs that can independently draft the fiber bundle F. The back bottom roller RB2, the third bottom roller RT2, the middle bottom roller RM2, and the front bottom roller RF2 are mounted on the apparatus frame 32 corresponding to the top rollers RB1, RT1, RM1, and RF1 of the cradle 31, respectively. The apparatus frame 32 is also equipped with bottom rollers RB2, RT2, RM2, and RF2 corresponding to two spindles of the adjacent spinning unit U.

  A ten server TB1 is disposed between the middle top roller RM1 and the front top roller RF1. The ten server TB1 regulates the tension and position of the apron belt E1 wound around the middle top roller RM1. The ten server TB1 is mounted on the cradle 31 side.

  A ten server TB2 is disposed between the middle bottom roller RM2 and the front bottom roller RF2. The ten server TB2 regulates the tension and position of the apron belt E2 wound around the middle bottom roller RM2. The ten server TB2 is mounted on the device frame 32 side.

  The cradle 31 is rotatable with respect to the apparatus frame 32 around a rotation shaft 33 provided on the upstream side. Therefore, by rotating the cradle 31, the top rollers RB1, RT1, RM1, and RF1 come in contact with and separate from the bottom rollers RB2, RT2, RM2, and RF2. A position where the cradle 31 is closed and the top rollers RB1, RT1, RM1, and RF1 are in contact with the bottom rollers RB2, RT2, RM2, and RF2 is a contact position. A position where the cradle 31 is opened for maintenance and the top rollers RB1, RT1, RM1, and RF1 are separated from the bottom rollers RB2, RT2, RM2, and RF2 is a separated position.

  A torque limiter TL as a holding portion is attached to the rotation shaft 33. The torque limiter TL is for stopping the cradle 31 at an arbitrary separation position. The opening / closing mechanism around the torque limiter TL and the rotation shaft 33 will be described in detail later.

  The turning operation of the cradle 31 is performed by the operator operating the handle 34. When the cradle 31 is closed and brought into the contact position, the hook portion 35 at the front end (reverse operation side) of the handle 34 is engaged with the fixed roller 36 on the apparatus frame 32 side, and each top roller RB1, RT1, RM1, RF1. And the pressure contact state of each bottom roller RB2, RT2, RM2, RF2 is maintained.

  Since the distance between each roller pair RB, RT, RM, RF is determined by the fiber length of the drafted fiber bundle (sliver) F, it is reviewed every time the type of the fiber bundle (sliver) F as the raw material is changed. For this purpose, among the bottom rollers RB2, RT2, RM2, and RF2, the middle bottom roller RM2 and the front bottom roller RF2 are fixed to the apparatus frame 32, but the back bottom roller RB2 and the third bottom roller RT2 are respectively connected to the apparatus frame. 32, the position can be changed upstream and downstream.

  Next, the torque limiter TL and the opening / closing mechanism around the rotating shaft 33 provided with the torque limiter TL, which are characteristic portions of the present invention, will be described.

  First, the opening / closing mechanism around the rotation shaft 33 will be described. As shown in FIGS. 3 and 4, the device frame 32 is provided with a first support portion 37 that supports and fixes the rotation shaft 33. The cradle 31 is provided with a second support portion 38. The second support portion 38 is mounted so as to be rotatable with respect to the rotation shaft 33. The cradle 31 is rotatably supported with respect to the apparatus frame 32 by the first support portion 37, the second support portion 38, and the rotation shaft 33.

  A torque limiter TL is mounted on the rotation shaft 33. A support shaft 39 is fixed to the second support portion 38 on the cradle 31 side. As will be described in detail later, the torque limiter TL is engaged with the support shaft 39 of the second support portion 38. As a result, the torque limiter TL stops the cradle 31 at an arbitrary separation position against the rotational torque caused by the weight of the cradle 31. Further, the torque limiter TL allows the cradle 31 to turn in the direction in which the turning torque is applied when a turning torque larger than the turning torque due to the weight of the cradle 31 is applied.

  Next, the configuration of the torque limiter TL will be described in detail. As shown in FIGS. 5 and 6, the torque limiter TL mainly includes a sleeve 41, a collar 51, an inner spring 61, and an outer spring 71.

  The sleeve 41 is attached and fixed to the outer periphery of the rotation shaft 33. The sleeve 41 mainly includes a cylindrical portion 42 and a flange portion 43. A shaft hole 44 for mounting on the rotation shaft 33 is formed inside the cylindrical portion 42. The inner diameter of the shaft hole 44 is substantially the same as the outer diameter of the rotation shaft 33. The flange portion 43 is formed at one end portion of the cylindrical portion 42. A shaft hole 44 through which the rotation shaft 33 is inserted is also formed in the flange portion 43. A screw hole 45 is formed in the flange portion 43 in the radial direction. The sleeve 41 is fixed to the rotation shaft 33 by screwing the screw 46 into the screw hole 45 in a state where the sleeve 41 is mounted on the rotation shaft 33. The position where the sleeve 41 is fixed to the rotation shaft 33 is a substantially central portion of the rotation shaft 33 (see FIG. 4). A groove 47 for locking the inner retaining ring 82 is formed on the outer periphery of the other end of the cylindrical portion 42.

  The collar 51 is disposed on the outer periphery of the sleeve 41. The collar 51 mainly includes a cylindrical portion 52 and a bottom portion 53. A shaft hole 54 having a diameter larger than the outer diameter of the sleeve 41 is formed inside the cylindrical portion 52. A space between the shaft hole 54 and the sleeve 41 becomes an inner spring chamber 56 in which the inner spring 61 is accommodated. The bottom part 53 is formed at one end of the cylindrical part 52. A shaft hole 55 through which the rotating shaft 33 is inserted is formed in the bottom portion 53. A notch 58 is formed at the other end of the cylindrical portion 52. The notch portion 58 is substantially U-shaped and long in the axial direction of the cylindrical portion 52. The notch 58 is a portion with which a protrusion 62 of the inner spring 61 described later is engaged. Grooves 57 for locking the outer retaining ring 81 are formed on the outer periphery of both ends of the cylindrical portion 52. As shown in FIG. 5, the collar 51 is attached to the outer periphery of the sleeve 41 after the inner spring 61 is attached to the sleeve 41.

  The inner spring 61 is disposed in an inner spring chamber 56 formed between the collar 51 and the sleeve 41. The inner spring 61 is a coil spring. The inner diameter of the inner spring 61 is a diameter that allows the inner spring 61 to be attached to the outer periphery of the cylindrical portion 42 of the sleeve 41. One end of the inner spring 61 is formed with a protrusion 62 that protrudes radially outward. In FIG. 6, the winding direction of the inner spring 61 is a direction that expands when a force in the closing direction is applied to the protruding portion 62 and contracts when a force in the opening direction is applied to the protruding portion 62. As shown in FIG. 6, after the inner spring 61 is mounted on the sleeve 41, the collar 51 is mounted on the outer periphery of the sleeve 41 and the inner spring 61. The protrusion 62 of the inner spring 61 is engaged with the notch 58 of the collar 51. After the collar 51 is mounted, the inner retaining ring 82 is mounted in the groove 47 of the sleeve 41 to prevent the collar 51 from dropping from the sleeve 41.

  The outer spring 71 is disposed on the outer periphery of the collar 51. The outer spring 71 is a coil spring. The inner diameter of the outer spring 71 is a diameter that allows the outer spring 71 to be mounted on the outer periphery of the cylindrical portion 52 of the collar 51. At one end portion of the outer spring 71, an engagement portion 72 bent in an annular shape is formed. As shown in FIG. 6, the engaging portion 72 is a portion that engages with the support shaft 39 on the cradle 31 side. The winding direction of the outer spring 71 is opposite to the winding direction of the inner spring 61. In FIG. 6, when a force in the closing direction is applied to the engaging portion 72, the diameter is reduced, and a force in the opening direction is applied to the engaging portion 72. It is a direction to expand the diameter when. As shown in FIG. 6, after the outer spring 71 is attached to the outer periphery of the collar 51, outer retaining rings 81 are attached to the grooves 57 at both ends of the collar 51 to prevent the outer spring 71 from falling off the collar 51. .

  Next, the operation of the torque limiter TL when the cradle 31 is rotated with respect to the apparatus frame 32 will be described with reference to FIGS. 6 and 7.

  First, the case where the operator rotates the handle 34 of the cradle 31 to move the cradle 31 from the state where the cradle 31 is in the contact position (FIG. 7A) to the separated position (FIG. 7B) will be described. In this case, as shown in FIG. 6, the engaging portion 72 of the outer spring 71 that engages with the support shaft 39 on the cradle 31 side receives a force in the opening direction by the operating force of the operator. The outer spring 71 expands in diameter when a force in the opening direction is applied to the engaging portion 72 as described above. When the diameter of the outer spring 71 is increased, the frictional force with the collar 51 is reduced, slipping occurs between the outer spring 71 and the collar 51, and the cradle 31 is movable in the opening direction.

  As described above, when the operator operates the cradle 31 in the opening direction, the outer spring 71 slides with respect to the collar 51, the inner spring 61, and the sleeve 41, thereby rotating the cradle 31 in the opening direction with respect to the apparatus frame 32. Can do.

  Next, it is assumed that the operator stops the rotation operation of the cradle 31 at an arbitrary separation position (FIG. 7B) and releases the hand from the handle 34. The cradle 31 tends to rotate in the closing direction due to its own weight. In this case, as shown in FIG. 6, the engaging portion 72 of the outer spring 71 that engages the support shaft 39 on the cradle 31 side receives a force in the closing direction due to the weight of the cradle 31. The outer spring 71 is reduced in diameter when a force in the closing direction is applied to the engaging portion 72 as described above. When the outer spring 71 is reduced in diameter, the frictional force with the collar 51 is increased, and the outer spring 71 and the collar 51 are integrated.

  On the other hand, the protrusion 51 of the inner spring 61 is engaged with the collar 51. The inner spring 61 receives a force in the closing direction from the collar 51. The inner spring 61 expands in diameter when a force in the closing direction is applied to the protrusion 62 as described above. When the diameter of the inner spring 61 is increased, the frictional force with the sleeve 41 is reduced. However, the inner spring 61 does not slip with the sleeve 41 due to the force in the closing direction due to the weight of the cradle 31. For this reason, the inner side spring 61 and the sleeve 41 remain in an integrated state.

  As described above, even if the operator stops the rotation of the cradle 31 at an arbitrary separation position and releases the hand from the handle 34, the outer spring 71, the collar 51, the inner spring 61, and the sleeve 41 do not slip with respect to each other. The cradle 31 can be stopped at an arbitrary separation position.

  A case will be described in which the operator rotates the handle 34 of the cradle 31 to move the cradle 31 from the state where the cradle 31 is in the separated position (FIG. 7B) to the contact position (FIG. 7A). In this case, as shown in FIG. 6, the engaging portion 72 of the outer spring 71 that engages the support shaft 39 on the cradle 31 side receives a force in the closing direction by the operator's operating force in addition to the weight of the cradle 31. It will be.

  The outer spring 71 is reduced in diameter when a force in the closing direction is applied to the engaging portion 72 as described above. When the outer spring 71 is reduced in diameter and the collar 51 is narrowed, the frictional force between the outer spring 71 and the collar 51 increases, so that the outer spring 71 and the collar 51 attempt to rotate together in the closing direction.

  On the other hand, the protrusion 51 of the inner spring 61 is engaged with the collar 51. The inner spring 61 receives a force in the closing direction from the collar 51. As described above, the inner spring 61 expands in diameter when a force in the closing direction is applied to the protrusion 62. When the inner spring 61 expands and loosens with respect to the sleeve 41, the frictional force with the sleeve 41 decreases, and when the inner spring 61 has the same inner diameter as the sleeve 41, the inner spring 61 moves against the sleeve 41. It will be in a state of sliding.

  As described above, when the operator rotates the cradle 31 in the closing direction, the outer spring 71, the collar 51, and the inner spring 61 rotate with respect to the sleeve 41, and rotate the cradle 31 in the closing direction with respect to the apparatus frame 32. Can be moved.

  Even when the cradle 31 is moved to a separation position with a different opening angle from a state where the cradle 31 is stopped at a separation position with a certain opening angle, if the operator releases the hand from the handle 34 as described above, The cradle 31 can be stopped at the arbitrary separated position.

  The draft device D and the spinning machine M according to the present embodiment described above have the following effects.

  The draft device D includes a torque limiter TL as a holding unit that holds the cradle 31 at the separated position when the cradle 31 is stopped when the cradle 31 is stopped at an arbitrary separated position in the rotation operation. For this reason, the cradle 31 can be stopped at an arbitrary separation position with a simple configuration, and the workability is good. Further, since the torque limiter TL is operated and the cradle 31 is stopped regardless of the position where the operator releases the hand from the cradle 31, it is not necessary to check whether the holding portion has been operated as in the case of the latch mechanism. . When the cradle 31 is returned from the separated position to the contact position, it is only necessary to rotate the cradle 31 in the closing direction, so that the cradle 31 can be opened and closed by a natural operation for the operator.

  The torque limiter TL is configured to slide with respect to a force larger than the force with which the cradle 31 moves to the contact position by its own weight. For this reason, when changing the separation position of the cradle 31 in a direction in which the opening angle of the cradle 31 is increased, the cradle 31 is rotated in the opening direction and stopped at an arbitrary separation position. The cradle 31 can be stopped at the position. Further, even when the separation position of the cradle 31 is changed in a direction in which the opening angle of the cradle 31 is reduced, if the cradle 31 is rotated in the closing direction and stopped at an arbitrary separation position, the arbitrary separation is achieved. The cradle 31 can be stopped at the position.

  The torque limiter TL includes a sleeve 41, a collar 51, an inner spring 61, and an outer spring 71. The torque limiter TL is configured such that the outer spring 71 is loosened and the collar 51 is not moved when the cradle 31 moves away from the contact position or from any contact position. When the cradle 31 moves from an arbitrary separation position in a direction approaching the contact position, the outer spring 71 is squeezed and a force is applied to the collar 51, whereby the inner spring 61 is loosened with respect to the sleeve 41, and the inner spring 61 and the collar are moved. 51 is configured to move. For this reason, the cradle 31 can be reliably stopped at an arbitrary separation position by the torque limiter TL having a simple configuration.

  The cradle 31 is configured to support the top rollers RB1, RT1, RM1, and RF1 of two rows of roller pairs capable of independently drafting the fiber bundle F. Therefore, in the configuration in which the two rows of fiber bundles F are drafted, the top rollers RB1, RT1, RM1, and RF1 can be stopped at any position between the contact position and the separation position at the same time.

  The spinning machine M includes a draft device D and an air spinning device 11. In the spinning machine M provided with the pneumatic spinning device 11, the draft speed is generally high, and the frequency of opening and closing the cradle 31 for maintenance or the like is relatively high. For this reason, by providing the cradle 31 that can be reliably stopped at an arbitrary separation position, workability such as maintenance is improved, and the operation efficiency of the spinning machine M is improved.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment, A various change is possible. For example, in the present embodiment, the spinning unit U of the spinning machine M is configured to draw the spun yarn Y from the spinning device 11 by the yarn slack eliminating device 13, but is not limited to this configuration. A delivery roller and a nip roller may be provided between the spinning device 11 and the yarn slack eliminating device 13, and the spun yarn Y may be pulled out by these rollers.

  In the present embodiment, the spinning machine M has been described. However, the spinning machine is not limited to the spinning machine, and may be a ring spinning machine, a rough spinning machine, a drawing machine, or the like as long as the drafting device D is provided.

M spinning machine U spinning unit 3 yarn splicing cart 4 blower box 5 prime mover box T trumpet D draft device 11 spinning device 12 yarn clearer 13 yarn slack eliminating device 14 cutter 21 winding device 22 cradle arm 23 winding drum 24 traverse device 25 cart Part 26 Splicer 27 Suction pipe 28 Suction mouse 31 Cradle 32 Device frame 33 Rotating shaft 34 Handle 35 Hook part 36 Fixed roller 37 First support part 38 Second support part 39 Support shaft TL Torque limiter 41 Sleeve 42 Tube part 43 Flange part 44 Shaft hole 45 Screw hole 46 Screw 47 Groove 51 Color 52 Tube part 53 Bottom part 54 Shaft hole 55 Shaft hole 56 Inner spring chamber 57 Groove 58 Notch part 61 Inner spring 62 Projection part 71 Outer spring 72 Engagement part 81 Outer part Retaining ring 82 Inner retaining ring F Fiber bundle Y Spinned yarn P Package

Claims (6)

A draft device comprising a plurality of roller pairs consisting of a top roller and a bottom roller for drafting a fiber bundle,
A cradle that rotatably supports the plurality of top rollers;
The cradle is rotatable to a contact position where the plurality of top rollers and the plurality of bottom rollers contact each other and a separation position where at least one of the plurality of top rollers is separated from the bottom roller. A pivot axis;
And a holding unit that holds the cradle at the separated position when the cradle is stopped when the cradle is stopped at an arbitrary separated position in the rotation operation. The draft device according to claim 1,
The holding device is configured so that the cradle can move with respect to a force larger than a force by which the cradle moves to the contact position under its own weight. The draft device according to claim 1 or 2, wherein
The draft device characterized in that the holding portion is a torque limiter. The draft device according to claim 3, wherein
The torque limiter is
A sleeve fixed to the outer periphery of the rotating shaft;
A collar disposed on the outer periphery of the sleeve;
An inner spring disposed between the collar and the sleeve;
An outer spring disposed outside the collar and connected to the cradle;
The torque limiter is configured such that when the cradle moves in a direction away from the contact position from a contact position or an arbitrary separation position, the outer spring is loosened and the collar does not move.
When the cradle moves in a direction approaching the contact position from an arbitrary separation position, the outer spring is squeezed and the inner spring is loosened with respect to the sleeve by applying a force to the collar, and the inner spring and the A draft device configured to move with a collar. The draft device according to any one of claims 1 to 4, wherein
The cradle is configured to support top rollers of two rows of roller pairs capable of independently drafting fiber bundles. The draft device according to any one of claims 1 to 5,
A spinning machine comprising: an air spinning device that produces a spun yarn by spinning the fiber bundle drafted by the draft device with a swirling airflow.

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