A weft thread cutting device for a rapier loom

Abstract

The present application relates to the technical field of rapier loom, and particularly relates to a weft yarn cutting device for rapier loom, which comprises a cutting table, a rotary motor is fixedly installed on the top of the cutting table through a support, a weft yarn frame in disc-shaped structure is fixedly installed on the output end of the rotary motor, a push-pull cylinder is fixedly installed on the side of the weft yarn frame away from the rotary motor, a first limiting wheel is fixedly installed on the output shaft of the push-pull cylinder, a push-pull shaft is fixedly installed on the end of the first limiting wheel away from the push-pull cylinder, and a yarn selecting wheel is sleeved on the outside of the push-pull shaft. The yarn selecting wheel is designed, the yarn selecting wheel is driven to move by the push-pull cylinder, the limiting block is separated from the limiting groove, the specified weft yarn rod is rotated to the use position by the rotary motor, the replacement of different weft yarns is realized, and the limitation that some rapier looms can only cut single weft yarn is solved.

Description

Technical Field

[0001] This invention relates to the field of rapier loom technology, and more particularly to a weft yarn cutting device for rapier looms. Background Technology

[0002] Rapier looms are a type of shuttleless loom commonly used in the production lines of cotton, wool, silk, and other fabrics. Due to their advantages such as high production efficiency and high degree of automation, rapier looms have gradually replaced manual and shuttle looms, becoming the main production machine for organic fabrics.

[0003] In a rapier loom, the rapier and the rapier-passing mechanism are used for the weft insertion process. The weft feeder and receiver rapiers move from both sides of the machine towards the center of the shed. The weft feeder introduces the weft yarn, and the receiver rapier engages and holds it, allowing the weft yarn to alternately pass through two sets of warp threads, thus completing one weaving cycle. After completing one weaving cycle, the weft yarn needs to be cut and re-inserted. The rapier loom repeats these steps during operation. Therefore, a cutting device is needed to cut the weft yarn during each weft insertion process, allowing the feeder rapier to re-fix the cut weft yarn end to complete the weft insertion process. In existing technology, some fabrics have specific patterns and surface textures, requiring the introduction of different colors and types of weft yarns when weaving on a rapier loom. However, in some small workshops, some rapier looms are relatively inexpensive but functionally outdated, only able to introduce and cut a single type of weft yarn. Weft yarn replacement can only be done manually by stopping the loom, resulting in low efficiency and limitations. Summary of the Invention

[0004] The purpose of this invention is to solve the problems in the background art by providing a weft yarn cutting device for a rapier loom.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a weft yarn cutting device for a rapier loom, comprising a cutting table, a rotary motor fixedly mounted on the top of the cutting table via a bracket, a disc-shaped weft yarn frame fixedly mounted on the output end of the rotary motor, a push-pull cylinder fixedly mounted on the side of the weft yarn frame away from the rotary motor, a first limiting wheel fixedly mounted on the telescopic end of the push-pull cylinder, a push-pull shaft fixedly mounted on the end of the first limiting wheel away from the push-pull cylinder, a second limiting wheel fixedly mounted on the end of the push-pull shaft away from the first limiting wheel, a yarn selecting wheel sleeved on the outer side of the push-pull shaft, the push-pull shaft slidingly connected to the inner wall of the yarn selecting wheel, a plurality of evenly distributed weft yarn grooves opened on one side of the yarn selecting wheel, a fixing ring sleeved on the outer side of the yarn selecting wheel, the fixing ring fixedly mounted on the top of the cutting table via a bracket, a plurality of hollow weft yarn rods fixedly mounted on the side of the yarn selecting wheel away from the push-pull cylinder, the weft yarn rods corresponding one-to-one with the weft yarn grooves and connected to the corresponding weft yarn grooves;

[0006] An L-shaped fixing rod is fixedly installed on the top of the shearing table, on the side of the fixing ring away from the push-pull cylinder. A hollow reciprocating slider is slidably connected to one side of the fixing rod. The bottom of the reciprocating slider has an inclined structure. An abutting rod is fixedly installed on the side of the second limiting wheel away from the push-pull cylinder. The end of the abutting rod away from the push-pull shaft has a hemispherical structure. The abutting rod abuts against the inclined surface of the reciprocating slider. A shearing blade is fixedly installed on the side of the reciprocating slider near the weft bar through a bracket. A blade holder is fixedly installed on the end of the weft bar away from the abutting rod.

[0007] In the aforementioned weft yarn cutting device for a rapier loom, the outer wall of the yarn selecting wheel is provided with several spring grooves evenly distributed along its circumference. The spring grooves and through holes are alternately arranged. A limiting block is inserted into the spring groove. The end of the limiting block away from the spring groove extends out of the spring groove and abuts against the inner wall of the fixing ring. The side of the fixing ring away from the push-pull cylinder is provided with several evenly distributed limiting grooves. The limiting grooves correspond one-to-one with the limiting blocks. The top of the limiting groove penetrates the surface of the inner wall of the fixing ring.

[0008] In the aforementioned weft yarn cutting device for a rapier loom, a yarn pulling groove is provided on one side of the weft yarn rod. Two symmetrically arranged squeezing rods are fixedly installed on the fixed rod by a bracket. Squeezing sliders are slidably connected to the side of the two squeezing rods near the reciprocating slider. A yarn pulling motor is fixedly installed at the end of the two squeezing sliders away from the squeezing rods. Yarn pulling wheels are fixedly installed on the output shafts of the two yarn pulling motors on both sides of a weft yarn rod. Both yarn pulling wheels extend into the yarn pulling groove of the corresponding weft yarn rod.

[0009] In the aforementioned weft yarn cutting device for a rapier loom, a triangular extrusion bar is fixedly installed on one side of the weft yarn rod.

[0010] In the aforementioned weft yarn cutting device for a rapier loom, one end of the weft yarn rod is rotatably connected to two symmetrically arranged clamping rollers on its inner wall, and the two clamping rollers abut against each other.

[0011] In the aforementioned weft yarn cutting device for a rapier loom, a support ring is sleeved on the outer side of the contact rod, and a support rod is fixedly installed on the top of the support ring. The support ring is fixedly installed on the fixed rod by a bracket.

[0012] In the aforementioned weft yarn cutting device for a rapier loom, several extrusion teeth are fixedly installed on the two yarn pulling wheels and evenly distributed along their circumference.

[0013] In the aforementioned weft yarn cutting device for a rapier loom, a ball bearing is rotatably connected to the end of the limiting block away from the spring groove.

[0014] Compared with existing technologies, the advantages of the weft yarn cutting device used in this rapier loom are as follows: This invention designs a yarn selection wheel. By using a push-pull cylinder to pull the push-pull shaft, the second limit wheel drives the yarn selection wheel to move, causing the limit block in the yarn selection wheel to disengage from the limit groove. A rotary motor drives the yarn selection wheel to rotate at a specified angle, causing the specified weft yarn rod to rotate to the working position. By using a push-pull cylinder to move the yarn selection wheel, the limit block enters the limit groove, locking the yarn selection wheel. Different weft yarns can be changed by using the yarn selection wheel, avoiding the limitation of simple rapier looms that can only cut a single weft yarn. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0016] Figure 2 This is the invention Figure 1 A magnified schematic diagram of the structure at point A in the middle.

[0017] Figure 3 This is a cross-sectional structural diagram of the present invention.

[0018] Figure 4 This is the invention Figure 2 A magnified schematic diagram of the structure at point B in the middle.

[0019] Figure 5 This is a partial three-dimensional cross-sectional structural schematic diagram of the present invention.

[0020] Figure 6 This is a cross-sectional structural schematic diagram of the push-pull shaft and spring groove of the present invention.

[0021] Figure 7 This is a cross-sectional view of the limiting groove of the present invention.

[0022] Figure 8 This is a cross-sectional structural schematic diagram of the extrusion rod of the present invention.

[0023] Figure 9 This is a three-dimensional structural diagram of the limiting block of the present invention.

[0024] In the diagram: 1. Shearing table; 2. Rotary motor; 3. Weft yarn holder; 4. Push-pull cylinder; 5. First limit wheel; 6. Push-pull shaft; 7. Second limit wheel; 8. Yarn selection wheel; 10. Fixing ring; 11. Weft yarn rod; 1101. Yarn pulling groove; 801. Weft yarn groove; 802. Spring groove; 803. Limiting block; 1001. Limiting groove; 12. Fixing rod; 13. Reciprocating slider; 14. Contact rod; 15. Shearing blade; 16. Blade holder; 17. Extrusion rod; 1701. Extrusion slider; 18. Yarn pulling motor; 19. Yarn pulling wheel; 20. Extrusion strip; 21. Clamping roller; 22. Support ring; 23. Support rod; 24. Extrusion teeth; 25. Ball bearing. Detailed Implementation

[0025] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0026] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0027] Reference Figures 1-9 A weft yarn cutting device for a rapier loom includes a shearing table 1. A rotary motor 2 is fixedly mounted on the top of the shearing table 1 via a bracket. A disc-shaped weft yarn holder 3 is fixedly mounted on the output end of the rotary motor 2. A push-pull cylinder 4 is fixedly mounted on the side of the weft yarn holder 3 away from the rotary motor 2. A first limit wheel 5 is fixedly mounted on the telescopic end of the push-pull cylinder 4. A push-pull shaft 6 is fixedly mounted on the end of the first limit wheel 5 away from the push-pull cylinder 4. A second limit wheel 7 is fixedly mounted on the end of the push-pull shaft 6 away from the first limit wheel 5. A yarn selecting wheel 8 is sleeved on the outer side of the push-pull shaft 6. The push-pull shaft 6 is slidably connected to the inner wall of the yarn selecting wheel 8. The first limit wheel 5 and the second limit wheel 7 are fixedly mounted on both ends of the push-pull shaft 6, respectively. The yarn selecting wheel 8 has several evenly distributed weft yarn passages 801 on one side. A fixing ring 10 is fitted on the outer side of the yarn selecting wheel 8. The fixing ring 10 is fixedly installed on the top of the shearing table 1 by a bracket. Several hollow weft yarn rods 11 are fixedly installed on the side of the yarn selecting wheel 8 away from the push-pull cylinder 4. The weft yarn rods 11 correspond one-to-one with the weft yarn passages 801 and are connected to the corresponding weft yarn passages 801. The first limiting wheel 5 and the second limiting wheel 7 are used to drive the yarn selecting wheel 8 to move in opposite directions in one direction. The rotary motor 2 is a stepper motor. The rotary motor 2 drives the weft yarn frame 3 to rotate, which causes the push cylinder to drive the rotating shaft to rotate, and then the rotating shaft drives the yarn selecting wheel 8 to rotate at the angle set by the rotary motor 2.

[0028] An L-shaped fixing rod 12 is fixedly installed on the top of the shearing table 1, on the side of the fixing ring 10 away from the push-pull cylinder 4. A hollow reciprocating slider 13 is slidably connected to one side of the fixing rod 12. The bottom of the reciprocating slider 13 has an inclined structure. An abutting rod 14 is fixedly installed on the side of the second limiting wheel 7 away from the push-pull cylinder 4. The end of the abutting rod 14 away from the push-pull shaft 6 has a hemispherical structure. The abutting rod 14 abuts against the inclined surface of the reciprocating slider 13. The reciprocating slider 13 is located on the side near the weft bar 11. The shearing blade 15 is fixedly installed on the bracket, and the end of the weft bar 11 away from the contact rod 14 is fixedly installed with a blade holder 16. The cylinder first pushes the push-pull shaft 6, which drives the contact rod 14 to reciprocate. The contact rod 14 presses the inclined surface of the reciprocating slider 13, which in turn causes the reciprocating slider 13 to reciprocate linearly in the up and down direction. With the shearing blade 15, the weft yarn can be cut periodically. With the yarn selector 8, the problem that rapier looms in small factories can only cut a single weft yarn is solved.

[0029] The outer wall of the yarn selecting wheel 8 has several spring grooves 802 evenly distributed along its circumference. The spring grooves 802 and through holes are alternately arranged. A limiting block 803 is inserted into the spring groove 802. The end of the limiting block 803 away from the spring groove 802 extends out of the spring groove 802 and abuts against the inner wall of the fixing ring 10. The side of the fixing ring 10 away from the push-pull cylinder 4 has several evenly distributed limiting grooves 1001. The limiting grooves 1001 correspond one-to-one with the limiting blocks 803. The top of the limiting grooves 1001 penetrates the surface of the inner wall of the fixing ring 10. The second limiting wheel 7 is driven by the push-pull cylinder 4 pulling the push-pull shaft 6. When the yarn selecting wheel 8 moves toward the direction of the pushing cylinder, the inclined surface of the limiting block 803 abuts against the inner wall of the limiting groove 1001, causing the limiting block 803 to enter the spring groove 802. At the same time, the yarn selecting wheel 8 disengages from the limiting groove 1001 and pushes the push-pull shaft 6 through the push-pull cylinder 4, causing the first limiting wheel 5 to abut against and drive the yarn selecting wheel 8 to move in the opposite direction. A first spring is provided in the spring groove 802. When the yarn selecting wheel 8 rotates, under the action of the first spring, the yarn selecting wheel 8 can be locked by the limiting block 803 abutting against the inner wall of the limiting groove 1001, thus preventing the yarn selecting wheel 8 from rotating and causing deviation in yarn selection.

[0030] A yarn pulling groove 1101 is provided on one side of the weft bar 11. Two symmetrically arranged extrusion bars 17 are fixedly installed on the fixed rod 12 by a bracket. Extrusion sliders 1701 are slidably connected to the side of the two extrusion bars 17 near the reciprocating slider 13. A yarn pulling motor 18 is fixedly installed at the end of the two extrusion sliders 1701 away from the extrusion bar 17. A yarn pulling wheel 19 is fixedly installed on the output shaft of the two yarn pulling motors 18 and on both sides of one weft bar 11. The two yarn pulling wheels 19 extend into the yarn pulling groove 1101 of the corresponding weft bar 11. The two yarn pulling motors 18 rotate in opposite directions. The two yarn pulling motors 18 drive the two yarn pulling wheels 19 to rotate, so that the weft yarn in the weft bar 11 is squeezed by the rotation of the two yarn pulling wheels 19. This can pull the weft yarn and feed it towards the cutting blade 15, avoiding excessive tension when the rapier is joined to the weft.

[0031] A triangular extrusion bar 20 is fixedly installed on one side of the weft bar 11. The extrusion bar 20 extrudes the yarn pulling wheel 19 through the intersection of the two inclined surfaces, so that the two yarn pulling wheels 19 are spread apart by the inclined surfaces of the extrusion bar 20.

[0032] Two symmetrically arranged clamping rollers 21 are rotatably connected to one end of the weft rod 11 and located on its inner wall. The two clamping rollers 21 abut against each other and are used to clamp the weft yarn to prevent the weft rod from being misaligned due to the loose weft yarn in the idle weft rod 11.

[0033] A support ring 22 is sleeved on the outer side of the abutment rod 14, and a support rod 23 is fixedly installed on the top of the support ring 22. The support ring 22 is fixedly installed on the fixed rod 12 by a bracket. The support rod 23 is used to abut the bottom of the weft rod 11 to prevent the weft rod 11 from breaking under the impact of the shearing blade 15.

[0034] Several squeezing teeth 24 are fixedly installed on the two yarn pulling rollers 19 and evenly distributed along their circumference. The squeezing teeth 24 are used to enhance the rotation squeezing effect of the yarn pulling rollers 19 and prevent the yarn pulling rollers 19 from slipping with the weft yarn.

[0035] The end of the limiting block 803 away from the spring groove 802 is rotatably connected to a ball bearing 25, which is used to reduce the rotational friction of the yarn selecting wheel 8.

[0036] The working principle and usage of this invention are explained in detail below: In use, the push-pull cylinder 4 first pushes the push-pull shaft 6 and then pulls the push-pull shaft 6, so that the second limit ring drives the abutment rod 14 to reciprocate. The abutment rod 14 abuts against the inclined surface of the reciprocating slider 13, so that the reciprocating slider 13 drives the shearing blade 15 to reciprocate periodically.

[0037] When the push-pull cylinder 4 is reset, the push-pull shaft 6 is pulled by the push-pull cylinder 4. At this time, the shearing blade 15 stops moving, causing the second limit ring to drive the yarn selection wheel 8 to move in the direction of the push-pull cylinder 4. The inclined surface of the limit block 803 abuts against the inner wall of the limit groove 1001, causing the limit block 803 to enter the spring groove 802 and disengage from the limit groove 1001. At this time, the yarn selection wheel 8 is unlocked and located at one end of the fixed ring 10.

[0038] At the same time, the weft rod 11 is pulled by the yarn selection wheel 8 so that the inner wall of the weft through groove 801 abuts against the yarn pulling wheel 19, thereby causing the two yarn pulling wheels 19 to rotate in opposite directions and disengage from the weft through groove 801. At this time, the weft rod 11 is unlocked and disengaged from the yarn pulling wheel 19, and the weft wheel is rotated by the rotary motor 2 at a specified angle.

[0039] At the same time, the extrusion strip 20 on the next weft bar 11 abuts against the gap between the two pulling wheels 19, causing the two pulling wheels 19 to be spread apart by a certain distance. When the pulling wheel 19 re-enters the weft channel 801, the weft bar 11 is locked. At the same time, the push-pull cylinder 4 pushes the push-pull shaft 6 again, causing the first limit wheel 5 to abut against and drive the yarn selection wheel 8 to move. When the limit block 803 abuts against the inner wall of the limit groove 1001, the weft wheel is locked again.

[0040] By repeating the above steps, you can cut several different weft yarns.

[0041] To further clarify, the aforementioned fixed connection should be interpreted broadly unless otherwise explicitly specified and limited. For example, it may be welding, gluing, or integral molding, or other conventional methods well known to those skilled in the art.

[0042] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A weft yarn cutting device for a rapier loom, comprising a shearing table (1), characterized in that: A rotary motor (2) is fixedly mounted on the top of the shearing table (1) via a bracket. A disc-shaped weft yarn frame (3) is fixedly mounted on the output end of the rotary motor (2). A push-pull cylinder (4) is fixedly mounted on the side of the weft yarn frame (3) away from the rotary motor (2). A first limit wheel (5) is fixedly mounted on the telescopic end of the push-pull cylinder (4). A push-pull shaft (6) is fixedly mounted on the end of the first limit wheel (5) away from the push-pull cylinder (4). A second limit wheel (7) is fixedly mounted on the end of the push-pull shaft (6) away from the first limit wheel (5). A yarn selection wheel (8) is fitted on the outer side of the yarn selection wheel (8). The push-pull shaft (6) is slidably connected to the inner wall of the yarn selection wheel (8). Several evenly distributed weft yarn passages (801) are opened on one side of the yarn selection wheel (8). A fixing ring (10) is fitted on the outer side of the yarn selection wheel (8). The fixing ring (10) is fixedly installed on the top of the shearing table (1) by a bracket. Several hollow weft yarn rods (11) are fixedly installed on the side of the yarn selection wheel (8) away from the push-pull cylinder (4). The weft yarn rods (11) correspond one-to-one with the weft yarn passages (801) and are connected to the corresponding weft yarn passages (801). An L-shaped fixing rod (12) is fixedly installed on the top of the shearing table (1) and on the side of the fixing ring (10) away from the push-pull cylinder (4). A hollow reciprocating slider (13) is slidably connected to one side of the fixing rod (12). The bottom of the reciprocating slider (13) is inclined. An abutting rod (14) is fixedly installed on the side of the second limiting wheel (7) away from the push-pull cylinder (4). The end of the abutting rod (14) away from the push-pull shaft (6) is hemispherical. The abutting rod (14) abuts against the inclined surface of the reciprocating slider (13). A shearing blade (15) is fixedly installed on the side of the reciprocating slider (13) near the weft bar (11) through a bracket. A blade holder (16) is fixedly installed on the end of the weft bar (11) away from the abutting rod (14). The outer wall of the yarn selection wheel (8) is provided with several spring grooves (802) evenly distributed along its circumference. The spring grooves (802) and the through holes are alternately arranged. A limiting block (803) is inserted in the spring groove (802). The end of the limiting block (803) away from the spring groove (802) extends out of the spring groove (802) and abuts against the inner wall of the fixing ring (10). Several evenly distributed limiting grooves (1001) are provided on the side of the fixing ring (10) away from the push-pull cylinder (4). The limiting grooves (1001) correspond one-to-one with the limiting blocks (803). The top of the limiting grooves (1001) penetrates the surface of the inner wall of the fixing ring (10). A yarn pulling groove (1101) is provided on one side of the weft rod (11). Two symmetrically arranged extrusion rods (17) are fixedly installed on the fixed rod (12) by a bracket. Extrusion sliders (1701) are slidably connected to the side of the two extrusion rods (17) near the reciprocating slider (13). A yarn pulling motor (18) is fixedly installed at the end of the two extrusion sliders (1701) away from the extrusion rods (17). A yarn pulling wheel (19) is fixedly installed on the output shaft of the two yarn pulling motors (18) and on both sides of a weft rod (11). The two yarn pulling wheels (19) extend into the yarn pulling groove (1101) of the corresponding weft rod (11).

2. The weft yarn cutting device for a rapier loom according to claim 1, characterized in that: A triangular extrusion strip (20) is fixedly installed on one side of the weft bar (11).

3. The weft yarn cutting device for a rapier loom according to claim 1, characterized in that: One end of the weft bar (11) is rotatably connected to two symmetrically arranged clamping rollers (21) on its inner wall, and the two clamping rollers (21) abut against each other.

4. The weft yarn cutting device for a rapier loom according to claim 1, characterized in that: The outer side of the abutment rod (14) is fitted with a support ring (22), and a support rod (23) is fixedly installed on the top of the support ring (22). The support ring (22) is fixedly installed on the fixed rod (12) by a bracket.

5. The weft yarn cutting device for a rapier loom according to claim 1, characterized in that: Several extrusion teeth (24) are fixedly installed on the two yarn-pulling rollers (19) and evenly distributed along their circumference.

6. The weft yarn cutting device for a rapier loom according to claim 1, characterized in that: The end of the limiting block (803) away from the spring groove (802) is rotatably connected to a ball (25).

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