CN211895522U

CN211895522U - Yarn tension detection device and winding unit

Info

Publication number: CN211895522U
Application number: CN202020191862.8U
Authority: CN
Inventors: 小林洋介; 冈崎阳平
Original assignee: Murata Machinery Ltd
Current assignee: Murata Machinery Ltd
Priority date: 2019-02-15
Filing date: 2020-02-14
Publication date: 2020-11-10
Anticipated expiration: 2030-02-14
Also published as: JP2020134245A

Abstract

The utility model provides a yarn tension detection device and winding unit. A yarn tension detecting device (22) deforms according to the tension of yarn contacting a yarn guide (57), and detects the strain of a strain detecting member (51) caused by the deformation by a strain gauge (56), wherein in the yarn tension detecting device (22), a contact part (53d) is provided on the opposite side of the guide body (52) across the strain detecting member (51) in the orthogonal direction orthogonal to the longitudinal direction of the strain detecting member (51), and when the strain detecting member (51) deforms to a certain extent or more, the tip part (51c) of the strain detecting member (51) contacts the contact part (53 d).

Description

Yarn tension detection device and winding unit

Technical Field

The utility model relates to a yarn tension detection device and winder unit.

Background

For example, japanese patent application laid-open No. 2013-49932 discloses a spinning sensor (spinning sensor) as one of yarn tension detecting devices provided in a spinning machine. The spinning sensor includes a strain detection member (a base portion in japanese patent laid-open publication No. 2013-49932) to which a strain gauge is attached. The strain detection member is supported by a cantilever, and a yarn guide that comes into contact with a running yarn is attached to a tip end portion of the strain detection member via a support arm. With this configuration, the strain detection member deforms in accordance with the tension of the yarn contacting the yarn guide, and the strain of the strain detection member caused by the deformation is detected by the strain gauge, whereby the tension of the yarn can be measured.

SUMMERY OF THE UTILITY MODEL

However, the spinning sensor disclosed in japanese patent application laid-open No. 2013-49932 has the following problems. For example, when an operator applies a large force to the yarn guide during maintenance such as cleaning of the yarn guide, the strain detecting member may be plastically deformed. In this case, if the permanent strain remaining in the strain detecting member due to plastic deformation is large and the reference potential at the time of no load of the strain gauge is out of the allowable range, there is a possibility that the tension of the yarn cannot be appropriately measured.

The present invention has been made in view of the above problems, and an object of the present invention is to suppress deformation of a strain detecting member when an overload is applied to a yarn guide.

The utility model relates to a yarn tension detection device possesses: a strain detection member extending in a longitudinal direction and having a strain gauge attached to a central portion in the longitudinal direction; a base member that cantileverly supports a base end portion of the strain detection member on one side of the strain gauge in the longitudinal direction; and a guide body that has a yarn guide that contacts a yarn, and that is attached to a distal end portion of the strain detecting member on the other side in the longitudinal direction than the strain gauge, wherein the strain detecting member deforms in accordance with tension of the yarn that contacts the yarn guide, and wherein a contact portion is provided on a side opposite to the guide body across the strain detecting member in a direction orthogonal to the longitudinal direction, and wherein the distal end portion of the strain detecting member contacts the contact portion when the strain detecting member is deformed by a certain degree or more.

According to the present invention, when the strain detection member is deformed to a certain extent or more, the front end portion of the strain detection member abuts against the abutting portion, and thus, the strain detection member can be suppressed from further deforming. Therefore, by appropriately setting the size (distance) of the gap between the strain detecting member and the contact portion, it is possible to suppress deformation of the strain detecting member when an overload is applied to the yarn guide.

In the present invention, an adjusting portion may be provided for adjusting the size of the gap between the tip portion of the strain detecting member and the abutting portion. This enables the size of the gap to be appropriately set and changed.

In the present invention, the abutting portion may be integrally formed with the base member.

In order to appropriately suppress the deformation of the strain detecting member, it is necessary to assemble each member with high accuracy so that the size of the gap between the strain detecting member and the abutting portion becomes as designed as possible. In this regard, if the abutting portion is integrally formed on the base member, the member interposed between the strain detection member and the abutting portion is only the base member, and therefore, the accuracy of the magnitude of the gap between the strain detection member and the abutting portion can be easily improved. In addition, an increase in the number of components can be suppressed.

In the present invention, a covering portion may be provided that covers at least a part of the strain detection member that is located on the other side than the abutting portion in the longitudinal direction and that is located on the opposite side of the guide body in the orthogonal direction.

If the portion of the strain detection member on the tip side (the other side) of the contact portion is exposed, the strain detection member may be greatly deformed when an operator touches the strain detection member from the opposite side of the guide body. Therefore, by providing such a cover portion, it is possible to make the portion difficult for the operator to reach.

In the present invention, the covering portion may be integrally formed with the base member.

If the cover is integrally formed with the base member, an increase in the number of components can be suppressed.

In the present invention, the yarn guide device may further include a cover member that covers the periphery of the strain detection member and the periphery of the guide body, and has a slit formed so that the yarn can contact the yarn guide, and a part of the cover portion may protrude from the cover member.

If the covering portion protrudes from the cover member, the operator can easily notice the presence of the covering portion, and the frequency of careless touching of the strain detection member can be reduced.

In the present invention, the yarn guide may be disposed at a position opposite to the strain gauge, and a protective member for protecting the strain gauge may be provided between the yarn guide and the strain gauge.

By providing such a protective member, it is possible to prevent the yarn guide from contacting the strain gauge and damaging the strain gauge. As described later, the protective member can also have a function of receiving an overload applied to the yarn guide. Further, it is possible to prevent a cleaning tool or the like used for maintenance from coming into contact with the strain gauge.

In the present invention, the guide body may include a support arm having a distal end portion provided with the yarn guide and a proximal end portion fixed to the strain detecting member, and the support arm may be tapered from the proximal end portion toward the distal end portion.

If the support arm is tapered in this manner, the support arm is likely to be elastically deformed when an overload is applied to the yarn guide. Further, the elastically deformed support arm is brought into contact with the protective member, whereby the deformation of the strain detecting member can be suppressed. Therefore, the deformation of the strain detection member can be more effectively suppressed.

In the present invention, the guide body may include a support arm having the yarn guide at a distal end portion thereof and a proximal end portion thereof fixed to the strain detecting member, the support arm may be formed with a weak portion, and the weak portion may be plastically deformed or broken when a force of a predetermined value or more is applied to the yarn guide.

By providing such a fragile portion in the support arm, the support arm is plastically deformed or broken when an overload is applied to the yarn guide. Therefore, an excessive load can be prevented from being applied to the strain detection member, and deformation of the strain detection member can be more effectively prevented.

In the present invention, the weak portion may be a constricted portion formed in the support arm.

The weak portion can be easily provided by forming the weak portion as a constricted portion.

In the present invention, the guide body may include a support arm provided with the yarn guide at a distal end portion thereof and swingably attached to the strain detecting member, and the yarn tension detecting device may include a biasing member biasing the support arm in a direction opposite to a swinging direction of the support arm when the tension of the yarn acts on the yarn guide.

According to this configuration, when an overload is applied to the yarn guide, the support arm swings while resisting the biasing force of the biasing member. Further, the support arm after swinging is in contact with the protection member, whereby deformation of the strain detection member can be suppressed. Therefore, the deformation of the strain detection member can be more effectively suppressed. Further, when the overload is eliminated, the support arm can be returned to the initial position by the urging member, which is preferable.

In the present invention, the swing fulcrum of the support arm may be disposed between the yarn guide and the urging position by the urging member.

According to this configuration, the urging member can be disposed on the opposite side of the yarn guide, that is, in the vicinity of the base end portion of the support arm, with the swing fulcrum therebetween, and therefore the urging member can be easily disposed.

In the present invention, the urging member may be a plate spring.

The plate spring has a high degree of freedom in shape, and therefore can be easily changed to an optimum shape or the like depending on the mounting position.

The utility model relates to a winder unit's characterized in that possesses: a yarn feeder for feeding a yarn; a winding device that winds the yarn supplied from the supply device; and a yarn tension detecting device according to any one of the above arranged between the supplying device and the winding device.

According to such a winding unit, deformation of the strain detection member when an overload is applied to the yarn guide can be suppressed.

In the present invention, a spinning device for spinning the yarn may be provided as the supply device.

According to such a winding unit (spinning unit), the tension of the yarn generated by the spinning device can be detected by the yarn tension detecting device.

Drawings

Fig. 1 is a front view showing the entire structure of the spinning machine according to the present embodiment.

Fig. 2 is a side view of the spinning unit and the yarn joining cart.

Fig. 3 is a front view of a yarn processing module.

Fig. 4 is a perspective view of the spinning sensor.

Fig. 5 is a perspective view of the spinning sensor with the cover member removed.

Fig. 6 is a perspective view of the spinning sensor with the protective member and the cover member removed.

Fig. 7A to 7D are views showing modified examples of the through-hole.

Fig. 8 is a partial side view of the spinning sensor with the protective member and the cover member removed.

Fig. 9 is a side view of the spinning sensor according to modification 1.

Fig. 10 is a side view of a spinning sensor according to modification 2.

Fig. 11 is a side view of a spinning sensor according to modification 3.

Fig. 12 is a perspective view of the spinning sensor with the cover member removed.

Description of the reference numerals

2: spinning unit (winding unit), 12: spinning device (supply device), 13: winding device, 22A, 22B, 22C: spinning sensor (yarn tension detecting device), 51: strain detection member, 51 b: base end portion, 51 c: front end, 52, 60, 70, 80: guide, 53: base member, 53 d: abutment, 53 e: cover, 54: protective member, 55: cover member, 55 a: slit, 56: strain gauge, 57, 61, 71, 81: yarn guide, 58, 62, 72, 82: support arm, 72 a: fragile portion, 83 a: swing shaft (swing fulcrum), 84: plate spring (urging member), Y: a yarn.

Detailed Description

(integral structure of spinning machine)

A spinning machine according to the present embodiment will be described with reference to the drawings. Fig. 1 is a front view showing the entire structure of the spinning machine according to the present embodiment. In the present description, the direction of the spinning machine 1 is defined according to the direction shown in fig. 1. The spinning machine 1 shown in fig. 1 includes: a plurality of spinning units 2 arranged in the left-right direction; a yarn joining cart 3 movable in the left-right direction; a 1 st end frame 4 arranged at the right end; and a 2 nd end frame 5 disposed at the left end portion.

The spinning unit 2 spins the fiber bundle T fed from the draft device 11 by a spinning device 12 (corresponding to a feeding device of the present invention) to generate a yarn Y, and winds the yarn Y around a bobbin B by a winding device 13 to form a package P. When a yarn break or yarn breakage occurs in a certain spinning unit 2, the yarn joining cart 3 moves to the spinning unit 2 and performs yarn joining. The 1 st end frame 4 houses a not-shown collecting device for collecting the fiber waste generated by the spinning unit 2, and the like. The 2 nd end frame 5 houses a suction device, not shown, that supplies negative pressure to the spinning unit 2 and the yarn joining cart 3, a drive device, not shown, that supplies power to each part of the spinning unit 2, and the like. The 2 nd end frame 5 houses a machine station control device 5a that centrally manages and controls the respective parts of the spinning machine 1.

(spinning unit)

Fig. 2 is a side view of the spinning unit 2 and the yarn joining cart 3. As shown in fig. 2, the spinning unit 2 includes, as main components, a draft device 11, a spinning device 12, a yarn processing module 14, and a winding device 13, which are arranged in this order from the upstream side to the downstream side in the traveling direction of the fiber bundle T or the yarn Y (hereinafter, referred to as the yarn traveling direction).

The draft device 11 is provided at the upper end of the spinning machine 1. The draft device 11 includes four draft roller pairs 16 to 19, i.e., a back roller pair 16, a third roller pair 17, a middle roller pair 18, and a front roller pair 19, in this order from the upstream side. The four draft roller pairs 16 to 19 are respectively composed of lower rollers 16a to 19a as driving rollers and upper rollers 16b to 19b as driven rollers. The rotational speeds of the draft roller pairs 16 to 19 are set so as to be faster as the roller pairs are closer to the downstream side in the yarn traveling direction. Thus, the draft device 11 forms the fiber bundle T by sandwiching and conveying the sliver S as the raw material of the fiber bundle T by the draft roller pairs 16 to 19 and drawing (drafting) the sliver S to a predetermined thickness.

The spinning device 12 is disposed immediately downstream of the front roller pair 19. The spinning device 12 twists the fiber bundle T drafted by the draft device 11 to generate a yarn Y. In the present embodiment, an air spinning device that twists the fiber bundle T with a swirling air flow is used as the spinning device 12.

The yarn processing module 14 is a module in which a yarn monitoring device 21, a spinning sensor 22 (corresponding to the yarn tension detecting device of the present invention) and a yarn accumulating device 23 are integrated. Details will be given later with respect to the yarn processing module 14.

The winding device 13 is disposed downstream of the yarn processing module 14, and winds the yarn Y around the bobbin B while traversing the yarn Y to form a package P. The winding device 13 includes a cradle arm 25, a winding drum 26, and a traverse device 27. The cradle arm 25 rotatably supports the bobbin B (package P). The cradle arm 25 is rotatable about a support shaft 25a, and can bring the outer peripheral surface of the bobbin B (package P) into contact with or away from the winding drum 26. The winding drum 26 is rotationally driven by a drive device not shown. The winding drum 26 rotates the bobbin B (package P) in contact with the winding drum 26, and winds the yarn Y around the outer peripheral surface of the bobbin B (package P). The traverse device 27 includes a traverse guide 28 that reciprocates the yarn Y in the axial direction of the bobbin B (package P). The structure for traversing the yarn Y is not limited to the traverse guide 28, and a winding bobbin having a traverse groove may be used.

(yarn joining trolley)

When a yarn breakage or yarn breakage occurs in a certain spinning unit 2, the yarn joining cart 3 moves to the spinning unit 2 and joins the broken yarn Y. As shown in fig. 2, the yarn joining cart 3 has a yarn joining device 30, a suction pipe 31, and a suction nozzle 32. The suction pipe 31 can be rotated in the up-down direction about the shaft 31 a. The suction pipe 31 rotates upward to suck and hold the yarn (upper yarn) Y spun from the spinning device 12, and then rotates downward to guide the upper yarn Y to the yarn joining device 30. The suction nozzle 32 can be rotated in the up-down direction about the shaft 32 a. The suction nozzle 32 rotates downward to suck and hold the yarn (lower yarn) Y drawn from the package P, and then rotates upward to guide the lower yarn Y to the yarn joining device 30.

The yarn joining device 30 joins the upper yarn Y guided by the suction pipe 31 and the lower yarn Y guided by the suction nozzle 32. In the present embodiment, as the yarn splicing device 30, a splicer is used in which yarn ends of the upper yarn Y and the lower yarn Y are twisted with each other by a swirling air flow to form a joint. However, instead of the splicer, for example, a knotter that connects the upper yarn Y and the lower yarn Y, or a splicer that guides the lower yarn Y to the spinning device 12 and starts spinning again by the spinning device 12 to connect the upper yarn Y and the lower yarn Y may be used.

(yarn processing module)

Fig. 3 is a front view of the yarn processing module 14. The yarn processing module 14 is attachable to and detachable from a support frame 6 (see fig. 1 and 2) constituting a part of a frame of the spinning machine 1. In the yarn processing module 14, a yarn monitoring device 21, a spinning sensor 22, and a yarn accumulating device 23 are arranged in this order from the upstream side to the downstream side in the yarn traveling direction. The yarn processing module 14 has a base frame 41 and a front cover 42. The front cover 42 is detachably attached to the front side of the base frame 41 by screws or the like, and constitutes the front surface of the yarn processing module 14. The front cover 42 has an opening 42a and a cutout 42 b. The yarn monitoring device 21 protrudes to the front of the front cover 42 through the opening 42 a. The spinning sensor 22 protrudes forward of the front cover 42 through the cutout portion 42 b. The yarn accumulating device 23 is exposed forward through the cutout portion 42 b.

The yarn monitoring device 21 monitors the thickness of the running yarn Y and/or the presence or absence of foreign matter and the like by an optical sensor, not shown, and detects the presence of an abnormality in the thickness of the yarn Y and/or a yarn defect such as the presence of foreign matter in the yarn Y. The yarn monitoring device 21 is not limited to an optical sensor, and may be, for example, a capacitance sensor. The spinning sensor 22 monitors the tension of the running yarn Y between the spinning device 12 and the yarn accumulating device 23. More specifically, the spinning sensor 22 detects a spinning tension (tension of the yarn Y being spun). The spinning sensor 22 will be described in detail later.

When the unit control unit, not shown, determines that there is an abnormality based on the detection result of at least one of the yarn monitoring device 21 and the spinning sensor 22, the unit control unit stops the supply of air to the spinning device 12 to interrupt the generation of the yarn Y, thereby cutting the yarn Y. Instead, a cutter may be disposed near the yarn monitoring device 21, and the yarn Y may be cut by the cutter. Alternatively, the yarn Y may be cut by stopping the rotation of the back roller pair 16 of the draft device 11.

The yarn accumulating device 23 includes an accumulating roller 23a and a yarn hooking member 23 b. The accumulating roller 23a can wind a certain amount of the yarn Y around the outer peripheral surface thereof and temporarily accumulate the yarn Y. The accumulating roller 23a is rotated and driven by a motor, not shown, and the yarn hooking member 23b is rotated integrally with the accumulating roller 23a in a state where the yarn Y is hooked, thereby accumulating the yarn Y in the accumulating roller 23 a. The yarn accumulating device 23 draws the yarn Y from the spinning device 12 by applying tension to the yarn Y. However, a pair of draw-off rollers such as a draw-off roller may be provided between the spinning device 12 and the yarn accumulating device 23, and the yarn Y may be drawn off from the spinning device 12 by the pair of draw-off rollers. In this case, the yarn accumulating device 23 may be omitted.

(spinning sensor)

Next, the structure of the spinning sensor 22 will be described in detail with reference to fig. 4 to 6. Fig. 4 is a perspective view of the spinning sensor 22. Fig. 5 is a perspective view of the spinning sensor 22 with the cover member 55 removed. Fig. 6 is a perspective view of the spinning sensor 22 with the protective member 54 and the cover member 55 removed. The spinning sensor 22 includes a strain detection member 51, a guide body 52, a base member 53, a protective member 54, and a cover member 55. Hereinafter, the explanation will be made based on the X, Y, Z axes shown in the respective drawings. The X-axis direction is equivalent to the length direction of the utility model, the-X side is equivalent to one side of the utility model, and the + X side is equivalent to the other side of the utility model. The Y-axis direction orthogonal to the X-axis direction corresponds to the orthogonal direction of the present invention. The Z-axis direction is orthogonal to both the X-axis direction and the Y-axis direction.

As shown in fig. 6, the strain detection member 51 is a rectangular parallelepiped member extending in the X-axis direction. The strain detection member 51 is made of metal (aluminum in the present embodiment). A through hole 51a penetrating in the Z-axis direction is formed in the center of the strain detection member 51 in the X-axis direction. The region of the strain detection member 51 in which the through-hole 51a is formed is thinned and easily deformed. The shape of the through-hole 51a when viewed from the Z-axis direction is not limited to the shape shown in fig. 6, and may be, for example, the shape shown in fig. 7A to 7D. As shown in fig. 6 and 7A to 7D, the through hole 51a is shaped to form a roberval (roberval) balance mechanism, thereby reducing an offset error.

A concave step portion 51d is formed in a region including the through hole 51a in the X-axis direction on the + Y side surface (hereinafter referred to as the "surface") of the strain detection member 51, and a strain gauge 56 is attached to the bottom surface of the step portion 51 d. However, the stepped portion 51d is not essential, and the strain gauge 56 may be attached to a flush surface of the strain detecting member 51 where the stepped portion 51d does not exist. The strain gauge 56 is provided in substantially the same region as the region in which the through-hole 51a is formed in the X-axis direction. An end portion (hereinafter referred to as a base end portion 51b) of the strain detection member 51 on the-X side (hereinafter referred to as a base end side) of the strain gauge 56 is cantilever-supported by the base member 53. The guide body 52 is attached to an end portion (hereinafter referred to as a distal end portion 51c) of the strain detection member 51 on the + X side (hereinafter referred to as a distal end side) of the strain gauge 56. The front end 51c of the strain detection member 51 is spaced apart from the base member 53.

The guide body 52 is disposed on the opposite side of the base member 53 in the Y-axis direction with the strain detection member 51 interposed therebetween. The guide body 52 is attached to the distal end portion 51c of the strain detection member 51. The guide body 52 has a yarn guide 57 and a support arm 58. The yarn guide 57 is disposed so as to face the strain gauge 56. The yarn guide 57 is made of a wear-resistant material such as ceramic, and the running yarn Y is in contact with the yarn guide 57. The yarn guide 57 is substantially cylindrical with the X-axis direction as the axial direction and has a reduced diameter portion 57a at the center in the axial direction. The yarn Y travels while contacting the reduced diameter portion 57a, and thus the yarn Y can be prevented from coming off the yarn guide 57. The support arm 58 is made of metal (aluminum in the present embodiment). The support arm 58 has a substantially L-shape when viewed from the Z-axis direction. The base end portion of the support arm 58 is fixed to the tip end portion 51c of the strain detection member 51. A yarn guide 57 is attached to the distal end of the support arm 58. That is, the yarn guide 57 is fixed to the distal end portion 51c of the strain detecting member 51 via the support arm 58.

The base member 53 has a structure in which a base portion 53a, an attachment portion 53b, a projection portion 53c, an abutment portion 53d, and a covering portion 53e are integrally formed. The base portion 53a cantilevers and supports the base end portion 51b of the strain detection member 51. The mounting portion 53b is mounted to the front cover 42 or the chassis 41. The convex portion 53c protrudes to the-Z side and has a rectangular shape when viewed from the Z-axis direction. The projection 53c is a portion for positioning the protection member 54 and the cover member 55. The contact portion 53d and the covering portion 53e will be described in detail later.

As shown in fig. 5, the protection member 54 has a structure in which a plate-like member is bent, and protects the strain gauge 56. The protective member 54 includes a main body 54a, a protective portion 54b, a cutout portion 54c, and a claw portion 54 d. The main body 54a is substantially parallel to the XY plane, and is fixed to the base member 53 together with the cover member 55 by screws N. The protector 54b is disposed between the strain gauge 56 and the yarn guide 57, and protects the strain gauge 56. The protective portion 54b is bent from the main body portion 54a to the + Z side, and is slightly inclined with respect to the XZ plane. Specifically, the guard portion 54b is inclined so as to be positioned on the + Y side as it goes to the tip side (+ Z side). When an overload is applied to the protecting portion 54b toward the-Y side, the distal end portion of the protecting portion 54b contacts the inner surface of the cover member 55, thereby suppressing deformation of the protecting portion 54b and preventing the protecting portion 54b from contacting the strain gauge 56. However, it is not essential that the protecting portion 54b is inclined as described above, and for example, the protecting portion 54b may be substantially parallel to the XZ plane. The cutout portion 54c is formed in the main body portion 54 a. The cutout 54c is rectangular and can be engaged with the projection 53c formed on the base member 53. The claw portion 54d protrudes from the body portion 54a to the-Z side and is inserted between the strain detection member 51 and the base member 53. The protection member 54 is positioned by engaging the cutout portion 54c with the convex portion 53c and inserting the claw portion 54d between the strain detection member 51 and the base member 53.

As shown in fig. 4, the cover member 55 covers at least the periphery of the strain detection member 51 and the periphery of the guide body 52. The cover member 55 also covers a portion of the base member 53. The cover member 55 is a box-shaped member having a dimension in the Z-axis direction smaller than the dimensions in the X-axis direction and the Y-axis direction. The cover member 55 has a-Y side opening, and the cover member 55 is attached to the strain detection member 51 and the guide 52 from the + Y side. A slit 55a for exposing a part of the yarn guide 57 to the outside is formed on the + Y side of the cover member 55. The yarn Y can contact the yarn guide 57 via the slit 55 a. The cover member 55 is formed with a rectangular cutout 55b that can engage with the projection 53c of the base member 53. The cover member 55 is positioned by engaging the cutout 55b with the projection 53 c. A rib 55c having a triangular shape when viewed from the Z-axis direction is formed on the surface of the cover member 55 on the + Y side. One side of the triangular rib 55c constitutes a guide portion 55d connected to the slit 55 a. Therefore, when the yarn Y is guided to the yarn joining device 30 by the suction pipe 31 at the time of yarn joining, the yarn Y is smoothly guided to the slit 55a by the guide portion 55 d. Further, since the yarn Y is substantially in point contact with the guide portion 55d, friction between the yarn Y and the guide portion 55d can be reduced, and the yarn Y can be more smoothly guided to the slit 55 a.

In the spinning sensor 22 configured as described above, the yarn Y running between the spinning device 12 and the yarn accumulating device 23 is in contact with the yarn guide 57 via the slit 55 a. By the yarn Y contacting the yarn guide 57, a force mainly toward the-Y side corresponding to the tension of the yarn Y is applied to the yarn guide 57. This force is applied to the distal end portion 51c of the strain detection member 51 via the support arm 58, and the strain detection member 51 deforms so that the distal end portion 51c displaces toward the-Y side. The tension of the yarn Y can be measured by detecting the strain of the strain detecting member 51 at this time using the strain gauge 56. The detection signal obtained based on the strain gauge 56 is output to a not-shown cell control unit.

(Structure for suppressing deformation of Strain detecting Member)

When a large force is applied to the yarn guide 57 during maintenance such as cleaning of the yarn guide 57 by an operator, for example, the strain detection member 51 may be plastically deformed. At this time, if the permanent strain remaining in the strain detecting member 51 due to the plastic deformation is large and the reference potential at the time of no load of the strain gauge 56 is out of the predetermined allowable range, the tension of the yarn Y cannot be properly measured any more. Therefore, in the spinning sensor 22 of the present embodiment, the abutment portion 53d is integrally formed on the base member 53 in order to suppress deformation when an overload is applied to the strain detection member 51.

Fig. 8 is a partial side view of the spinning sensor 22 with the protective member 54 and the cover member 55 removed. As shown in fig. 8, the contact portion 53d is disposed on the distal end side of the strain gauge 56 in the X-axis direction and faces the distal end portion 51c of the strain detection member 51. A gap G is present between the contact portion 53d and a surface on the-Y side (hereinafter referred to as a back surface) of the strain detection member 51. When an overload toward the-Y side is applied to the guide body 52, the strain detection member 51 is deformed so that the distal end portion 51c of the strain detection member 51 is displaced toward the-Y side. When the strain detection member 51 is deformed to a certain extent or more, the distal end portion 51c of the strain detection member 51 abuts against the abutting portion 53d, and further deformation of the strain detection member 51 is suppressed. Therefore, even when an overload is applied to the guide body 52, the amount of deformation of the strain detection member 51 can be suppressed to a constant amount corresponding to the size of the gap G, and large plastic deformation of the strain detection member 51 can be suppressed.

The smaller the gap G when no load is applied to the guide body 52, the smaller the amount of deformation of the strain detection member 51 can be. However, if the gap G is too small, the strain detection member 51 may come into contact with the contact portion 53d when measuring the tension of the yarn Y, and the tension of the yarn Y may not be measured appropriately. On the other hand, if the gap G is too large, the amount of deformation until the strain detection member 51 comes into contact with the contact portion 53d becomes large, and there is a possibility that the strain detection member 51 exceeds the allowable range and is plastically deformed. Therefore, the size of the gap G when no load is applied to the guide body 52 is, for example, 0.1mm to 0.3 mm. In the present embodiment, the size of the gap G when no load is applied to the guide body 52 is set to about 0.2mm, and thereby, an excessive load up to about 5kg can be received. The tension of the yarn Y measured by the spinning sensor 22 is assumed to be about 0 to 35 g.

As shown in fig. 8, the strain detection member 51 extends to a position on the tip side of the contact portion 53 d. Therefore, the rear surface of the portion of the strain detection member 51 protruding toward the front end side from the contact portion 53d is exposed, and a load is easily applied from the rear surface to the + Y side. Therefore, in the present embodiment, the base member 53 is provided with the cover portion 53 e. The covering portion 53e protrudes further toward the front end side than the contact portion 53d of the base member 53, and covers at least a part of the rear surface of the strain detection member 51 toward the front end side than the contact portion 53d from the-Y side. Therefore, the operator hardly touches the back surface of the strain detection member 51, and the application of an excessive load from the back surface can be suppressed. In order to avoid the contact between the strain detecting member 51 and the covering portion 53e when measuring the tension of the yarn Y, a gap larger than the gap G is secured between the strain detecting member 51 and the covering portion 53 e. In fig. 8, the outline of the cover member 55 is illustrated in a one-dot chain line. When the cover member 55 is covered, a part of the covering portion 53e protrudes from the cover member 55. Thus, even in a state where the cover member 55 is covered, the operator can easily recognize the presence of the covering portion 53e, and the operator can be effectively prevented from inadvertently touching the back surface of the strain detection member 51.

(Effect)

The spinning sensor 22 (yarn tension detecting device) of the present embodiment is provided with a contact portion 53d on the opposite side of the guide body 52 via the strain detecting member 51 in the Y-axis direction (orthogonal direction) orthogonal to the X-axis direction (longitudinal direction) in which the strain detecting member 51 extends, and when the strain detecting member 51 is deformed to a certain extent or more, the tip portion 51c of the strain detecting member 51 contacts the contact portion 53 d. When the strain detection member 51 is deformed to a certain extent or more, the distal end portion 51c of the strain detection member 51 abuts against the abutting portion 53d, so that further deformation of the strain detection member 51 can be suppressed. Therefore, by appropriately setting the size of the gap G between the strain detection member 51 and the contact portion 53d, it is possible to suppress deformation of the strain detection member 51 when an excessive load is applied to the yarn guide 57.

As a comparative example of the present embodiment, for example, a structure in which the contact portion 53d contacts the guide body 52 (the yarn guide 57 or the support arm 58) is considered. In contrast to this comparative example, according to the present embodiment, when the strain detection member 51 is deformed to a certain extent or more, the distal end portion 51c of the strain detection member 51 abuts against the abutting portion 53d, so that deformation of the strain detection member 51 to a certain extent or more can be directly dealt with.

In the present embodiment, the abutment portion 53d is integrally formed on the base member 53. In order to appropriately suppress the deformation of the strain detection member 51, it is necessary to assemble the members with high accuracy so that the size of the gap G between the strain detection member 51 and the contact portion 53d becomes as designed as possible. In this regard, if the contact portion 53d is integrally formed on the base member 53, the only member interposed between the strain detection member 51 and the contact portion 53d is the base member 53, and therefore, the accuracy of the size of the gap G between the strain detection member 51 and the contact portion 53d can be easily achieved. In addition, an increase in the number of components can be suppressed.

In the present embodiment, a covering portion 53e is provided, and this covering portion 53e covers at least a portion of the strain detection member 51 that is located on the front end side in the X axis direction with respect to the abutting portion 53d and on the opposite side of the guide body 52 in the Y axis direction. If the portion of the strain detection member 51 located on the distal end side of the contact portion 53d is exposed, the strain detection member 51 may be greatly deformed by the operator touching the strain detection member 51 from the opposite side of the guide body 52. Therefore, by providing the covering portion 53e as described above, it is possible to make the portion difficult for the operator to reach.

In the present embodiment, the cover portion 53e is integrally formed on the base member 53. If the covering portion 53e is integrally formed on the base member 53, an increase in the number of components can be suppressed.

In the present embodiment, a cover member 55 is further provided, the cover member 55 covering the periphery of the strain detection member 51 and the periphery of the guide body 52, and a slit 55a is formed so that the yarn Y can contact the yarn guide 57, and a part of the covering portion 53e protrudes from the cover member 55. When the covering portion 53e protrudes from the cover member 55, the operator can easily notice the presence of the covering portion 53e, and the frequency of careless touching of the strain detection member 51 can be reduced.

In the present embodiment, the yarn guide 57 is disposed at a position facing the strain gauge 56, and the protective member 54 (protective portion 54b) for protecting the strain gauge 56 is provided between the yarn guide 57 and the strain gauge 56. By providing such a protective member 54, it is possible to prevent the yarn guide 57 from contacting the strain gauge 56 and damaging the strain gauge 56. As described in a modification example to be described later, the protective member 54 can also have a function of receiving an excessive load applied to the yarn guide 57. Further, it is possible to prevent a cleaning tool or the like used at the time of maintenance from coming into contact with the strain gauge 56.

(others)

In the above embodiment, the contact portion 53d is provided to suppress deformation of the strain detection member 51 when an excessive load is applied to the yarn guide 57. However, the deformation of the strain detection member 51 can be more effectively suppressed by providing the abutting portion 53d and also providing the structures of modifications 1 to 3 described below. In addition, even when the deformation of the strain detection member 51 can be sufficiently suppressed only by the configurations described in the following modification examples 1 to 3, the abutting portion 53d can be omitted.

(modification 1)

Fig. 9 is a side view of the spinning sensor 22A according to modification 1. The spinning sensor 22A according to modification 1 employs a guide 60 instead of the guide 52 of the above embodiment. The same structure as that of the above embodiment will not be described, and the structure of the guide body 60 will be mainly described.

The guide body 60 includes a yarn guide 61, a support arm 62, and a support member 63. The support arm 62 extends substantially parallel to the strain detection member 51 (i.e., in the X-axis direction), has a base end fixed to the support member 63, and has a yarn guide 61 attached to a tip end thereof. The support member 63 stands on the front end portion 51c of the strain detection member 51. That is, the support arm 62 is fixed to the distal end portion 51c of the strain detection member 51 via the support member 63. However, the support arm 62 and the support member 63 may be integrally formed.

The support arm 62 has a tapered shape that tapers from the base end portion toward the tip end portion in the X-axis direction. Therefore, when an excessive load is applied to the yarn guide 61, the support arm 62 is easily elastically deformed so that the distal end portion is displaced to the-Y side. Further, the support arm 62 after the elastic deformation is brought into contact with the protection portion 54b (see the one-dot chain line in fig. 9) of the protection member 54, whereby the deformation of the strain detection member 51 can be suppressed. Therefore, the deformation of the strain detection member 51 can be more effectively suppressed. In order to facilitate elastic deformation of the support arm 62, it is also effective to change the material of the support arm 62 to a material having low rigidity or to make the support arm 62 have a more elongated shape.

(modification 2)

Fig. 10 is a side view of the spinning sensor 22B according to modification 2. The spinning sensor 22B according to modification 2 employs a guide 70 instead of the guide 52 of the above embodiment. The same structure as that of the above embodiment will not be described, and the structure of the guide body 70 will be mainly described.

The guide body 70 includes a yarn guide 71, a support arm 72, and a support member 73. The support arm 72 extends substantially parallel to the strain detection member 51 (i.e., in the X-axis direction), has a base end fixed to the support member 73, and has a yarn guide 71 attached to a tip end thereof. The support member 73 stands on the front end portion 51c of the strain detection member 51. That is, the support arm 72 is fixed to the distal end portion 51c of the strain detection member 51 via the support member 73. However, the support arm 72 and the support member 73 may be integrally formed.

A weak portion 72a is formed at the center portion of the support arm 72 in the axial direction. The weak portion 72a has a smaller diameter than the other portions of the support arm 72, and is a constricted portion. The shape and size of the fragile portion 72a are determined so that plastic deformation or breakage occurs when a force of a predetermined value or more acts on the yarn guide 71. By providing such a fragile portion 72a to the support arm 72, the support arm 72 is plastically deformed or broken when an excessive load is applied to the yarn guide 71. Therefore, an excessive load can be prevented from being applied to the strain detection member 51, and deformation of the strain detection member 51 can be more effectively prevented. As shown by the one-dot chain line in fig. 10, the protection portion 54b of the protection member 54 is disposed between the yarn guide 71 and the strain gauge 56. Therefore, the yarn guide 71 or the support arm 72 can be prevented from coming into contact with the strain gauge 56 due to plastic deformation or breakage of the support arm 72.

In the present modification, the weak portion 72a can be easily provided by forming the weak portion 72a in a constricted shape, but it is not essential to form the weak portion 72a in a constricted shape. For example, a through hole, a cutout, or the like may be formed in a part of the support arm, thereby forming a weak portion that is likely to be plastically deformed or broken. Further, the material of the support arm may be changed to a material having a low yield strength.

(modification 3)

Fig. 11 is a side view of a spinning sensor 22C according to modification 3. The spinning sensor 22C according to modification 3 employs a guide body 80 instead of the guide body 52 of the above embodiment. The same structure as that of the above embodiment will not be described, and the structure of the guide body 80 will be mainly described.

The guide body 80 includes a yarn guide 81, a support arm 82, a support member 83, and a plate spring 84 (corresponding to a biasing member of the present invention). The support arm 82 extends substantially parallel to the strain detection member 51 (i.e., in the X-axis direction), and a yarn guide 81 is attached to a distal end portion thereof. The support arm 82 is attached at its center portion to the support member 83 via a swing shaft 83a (corresponding to a swing fulcrum of the present invention) extending in the Z-axis direction. Thus, the support arm 82 is configured to be swingable about the Z axis. The support member 83 stands on the front end portion 51c of the strain detection member 51. That is, the support arm 82 is fixed to the distal end portion 51c of the strain detection member 51 via the support member 83. The leaf spring 84 is attached to the front end portion 51c of the strain detection member 51. The plate spring 84 biases the base end portion (the portion closer to the base end side than the swing shaft 83 a) of the support arm 82 to the-Y side. That is, the plate spring 84 biases the support arm 82 in a direction opposite to the swinging direction of the support arm 82 when the tension of the yarn Y acts on the yarn guide 81.

According to such a configuration, when an overload is applied to the yarn guide 81, the support arm 82 swings against the urging force of the leaf spring 84. Further, the support arm 82 after swinging is in contact with the protection portion 54b (see the one-dot chain line in fig. 11) of the protection member 54, whereby deformation of the strain detection member 51 can be suppressed. Therefore, the deformation of the strain detection member 51 can be more effectively suppressed. Further, when the overload is eliminated, the support arm 82 can be returned to the initial position by the plate spring 84, which is preferable. The swing shaft 83a of the support arm 82 is disposed between the yarn guide 81 and the biasing position by the leaf spring 84. According to such a configuration, the plate spring 84 may be disposed on the opposite side of the yarn guide 81 with the swing shaft 83a interposed therebetween, that is, in the vicinity of the base end portion of the support arm 82, and therefore, the plate spring 84 is easily disposed. Further, when the plate spring 64 is used as the biasing member, the plate spring can be easily changed to an optimum shape or the like depending on the mounting position because of a high degree of freedom of the shape. As shown by the one-dot chain line in fig. 11, the protection portion 54b of the protection member 54 is disposed between the yarn guide 81 and the strain gauge 56. Therefore, when the support arm 82 swings against the urging force of the plate spring 84, the yarn guide 81 can be prevented from contacting the strain gauge 56.

In the present modification, the plate spring 84 is used as the urging member of the present invention, but the urging member may be a member other than the plate spring. The positional relationship between the pivot shaft 83a and the biasing position by the plate spring 84 can also be changed. For example, the swing shaft 83a may be disposed at the base end of the support arm 82, and a biasing member may be provided to bias the center portion of the support arm 82 toward the + Y side.

(other modification example)

In the above embodiment, the abutting portion 53d is integrally formed on the base member 53, but the abutting portion is not necessarily integrally formed on the base member 53. For example, an abutting portion formed of a separate member may be fixed to the base member 53.

In the above embodiment, the covering portion 53e covering a part of the rear surface of the front end portion 51c of the strain detection member 51 is integrally formed on the base member 53. However, the cover portion 53e is not necessarily provided, and may be formed of a member different from the base member 53. For example, as shown in fig. 12, the shape of the protective member 54 may be changed from the above-described embodiment, and the covering portion 54e may be provided on the protective member 54. In addition, it is not necessary to make a part of the covering portion 53e protrude from the cover member 55.

In the above embodiment, the spinning

sensors

22, 22A, 22B, and 22C may be provided with an adjusting portion that adjusts the size of the gap G between the distal end portion 51C of the strain detecting member 51 and the contact portion 53 d. The abutting portion 53d itself may be the adjusting portion, or the adjusting portion may be provided separately from the abutting portion 53 d.

For example, the abutting portion 53d may be formed of a screw member, and the base member 53 may be provided with a screw groove into which a screw serving as the abutting portion 53d is fitted, thereby setting the abutting portion 53d itself as the adjusting portion. The screw groove is formed to extend in the Y-axis direction. Thus, the size of the gap G can be adjusted by the amount of protrusion of the screw as the contact portion 53d (the amount of protrusion of the screw from the surface of the base member 53 facing the strain detection member 51).

For example, the contact portion 53d may be formed of a member (separate member) separate from the base member 53, and a long hole extending in the Y-axis direction may be formed in either the contact portion 53d or the base member 53. The contact portion 53d can be attached to the base member 53 with a screw via a long hole. This allows the size of the gap G to be adjusted by changing the attachment position of the screw. Further, a plurality of circular holes may be formed instead of the long holes.

For example, the size of the gap G may be adjusted by fastening the spacers together when supporting the base end 51b of the strain detection member 51 on the base member 53. If a plurality of spacers are prepared in advance, the size of the gap G can be adjusted by fastening any one or a plurality of spacers together.

In the above embodiment, the

support arms

58, 62, 72, 82 are formed in a substantially L shape when viewed from the Z-axis direction, and are attached to the strain detecting member 51 so that the

support arms

58, 62, 72, 82 and the strain detecting member 51 are formed in a substantially C shape when viewed from the Z-axis direction. However, the

support arms

58, 62, 72, 82 may be formed in a substantially L shape when viewed from the Z-axis direction, and may be attached to the strain detecting member 51 such that the

support arms

58, 62, 72, 82 and the strain detecting member 51 are stepped when viewed from the Z-axis direction (in other words, substantially Z-shaped when viewed from the-Z direction).

The

support arms

58, 62, 72, and 82 may be formed in a substantially I-shape (linear shape) when viewed from the Z-axis direction, and may be attached to the strain detecting member 51 so that the

support arms

58, 62, 72, and 82 and the strain detecting member 51 are formed in a substantially I-shape when viewed from the Z-axis direction.

In the above embodiment, the contact portion 53d contacts the distal end portion 51c of the strain detection member 51. More specifically, in the example shown in fig. 5, 6, 8 to 12, in the strain detecting member 51, the contact portion 53d contacts the distal end portion 51c located closer to the proximal end side (the (-X side) than the fixing position of the

support arms

58, 62, 72, 82. However, the shape of the strain detection member 51 is not limited to the example shown in fig. 5, 6, and 8 to 12, and for example, the distal end portion 51c of the strain detection member 51 may be extended further than the fixing positions of the

support arms

58, 62, 72, and 82, and the contact portion 53d may be brought into contact with the distal end portion 51c located on the distal end side (+ X side) than the fixing position to the strain detection member 51.

In the above embodiment, the spinning sensor 22 is included in the yarn processing module 14, but the spinning sensor 22 may not be included in the yarn processing module 14. For example, the spinning sensor 22 may be mounted on the support frame 6 or the like as a single body.

In the above embodiment, the present invention is applied to the spinning sensor 22 provided in the spinning unit 2 of the spinning machine 1. However, the present invention may be applied to a yarn tension detecting device provided in a winding unit of an automatic winder, for example.

Claims

1. A yarn tension detection device is provided with:

a strain detection member extending in a longitudinal direction and having a strain gauge attached to a central portion in the longitudinal direction;

a base member that cantileverly supports a base end portion of the strain detection member on one side of the strain gauge in the longitudinal direction; and

a guide body having a yarn guide in contact with the yarn, and attached to a distal end portion of the strain detecting member on the other side in the longitudinal direction than the strain gauge,

the strain detection member deforms in accordance with tension of the yarn contacting the yarn guide, and detects strain of the strain detection member caused by the deformation by the strain gauge,

it is characterized in that the preparation method is characterized in that,

an abutting portion is provided on a side opposite to the guide body with the strain detection member interposed therebetween in an orthogonal direction orthogonal to the longitudinal direction, and when the strain detection member is deformed by a certain degree or more, the tip end portion of the strain detection member abuts against the abutting portion.

2. Yarn tension detecting device according to claim 1,

the abutment portion is integrally formed with the base member.

3. Yarn tension detecting device according to claim 1,

the yarn tension detecting device is provided with a covering portion that covers at least a portion of the strain detecting member that is positioned on the other side than the abutting portion in the longitudinal direction and that is positioned on the opposite side of the guide body in the orthogonal direction.

4. Yarn tension detecting device according to claim 2,

5. Yarn tension detecting device according to claim 3,

the cover is integrally formed with the base member.

6. Yarn tension detecting device according to claim 4,

the cover is integrally formed with the base member.

7. Yarn tension detecting device according to claim 3,

the yarn tension detecting device further includes a cover member that covers a periphery of the strain detecting member and a periphery of the guide body and has a slit formed so that the yarn can contact the yarn guide,

a portion of the cover portion protrudes from the cover member.

8. Yarn tension detecting device according to claim 4,

a portion of the cover portion protrudes from the cover member.

9. Yarn tension detecting device according to claim 5,

a portion of the cover portion protrudes from the cover member.

10. Yarn tension detecting device according to claim 6,

a portion of the cover portion protrudes from the cover member.

11. Yarn tension detecting device according to claim 1,

the yarn guide is disposed at a position opposite to the strain gauge,

a protective member that protects the strain gauge is provided between the yarn guide and the strain gauge.

12. Yarn tension detecting device according to claim 2,

the yarn guide is disposed at a position opposite to the strain gauge,

13. Yarn tension detecting device according to claim 3,

the yarn guide is disposed at a position opposite to the strain gauge,

14. Yarn tension detecting device according to claim 4,

the yarn guide is disposed at a position opposite to the strain gauge,

15. Yarn tension detecting device according to claim 5,

the yarn guide is disposed at a position opposite to the strain gauge,

16. Yarn tension detecting device according to claim 6,

the yarn guide is disposed at a position opposite to the strain gauge,

17. Yarn tension detecting device according to claim 7,

the yarn guide is disposed at a position opposite to the strain gauge,

18. Yarn tension detecting device according to claim 8,

the yarn guide is disposed at a position opposite to the strain gauge,

19. Yarn tension detecting device according to claim 9,

the yarn guide is disposed at a position opposite to the strain gauge,

20. Yarn tension detecting device according to claim 10,

the yarn guide is disposed at a position opposite to the strain gauge,

21. Yarn tension detecting device according to one of claims 1 to 20,

the guide body has a support arm provided with the yarn guide at a distal end portion thereof and having a proximal end portion fixed to the strain detecting member,

the support arm is tapered from the base end portion toward the tip end portion.

22. Yarn tension detecting device according to one of claims 1 to 20,

the support arm is formed with a weak portion that is plastically deformed or broken when a force of a predetermined value or more is applied to the yarn guide.

23. Yarn tension detecting device as in claim 22,

the weak portion is a constricted portion formed in the support arm.

24. Yarn tension detecting device according to one of claims 1 to 20,

the guide body has a support arm provided with the yarn guide at a distal end portion thereof and swingably attached to the strain detecting member,

the yarn tension detecting device is provided with a biasing member that biases the support arm in a direction opposite to a swinging direction of the support arm when the yarn tension acts on the yarn guide.

25. Yarn tension detecting device as in claim 24,

the swing fulcrum of the support arm is disposed between the yarn guide and the urging position by the urging member.

26. Yarn tension detecting device as in claim 24,

the urging member is a plate spring.

27. Yarn tension detecting device as in claim 25,

the urging member is a plate spring.

28. Yarn tension detecting device according to one of claims 1 to 20,

the yarn tension detecting device is provided with an adjusting portion that adjusts the size of the gap between the tip portion of the strain detecting member and the abutting portion.

29. Yarn tension detecting device as in claim 21,

30. Yarn tension detecting device as in claim 22,

31. Yarn tension detecting device as in claim 23,

32. Yarn tension detecting device as in claim 24,

33. Yarn tension detecting device as in claim 25,

34. Yarn tension detecting device as in claim 26,

35. Yarn tension detecting device as in claim 27,

36. A winding unit is characterized by comprising:

a yarn feeder for feeding a yarn;

a winding device that winds the yarn supplied from the supply device; and

the yarn tension detecting device according to any one of claims 1 to 35, disposed between the feeding device and the winding device.

37. The winding unit according to claim 36,

the supply device is provided with a spinning device for spinning the yarn.