Automatic sewing equipment for umbrella canopy binding

Abstract

This application relates to an automatic sewing device for umbrella surface ties, including a worktable. The worktable is equipped with a sewing machine, a feeding assembly for conveying Velcro, a fabric feeding assembly for conveying fabric strips, and a cutting assembly for cutting the fabric strips. The worktable has a first unwinding roller for feeding the fabric strips. The feeding assembly includes a first pusher seat, a first gripper cylinder, and a first drive component. The first pusher seat is slidably mounted on the worktable, and the first gripper cylinder is rotatably connected to the first pusher seat to grip the fabric strip. The sewing machine has a sewing station, and the first drive component is connected to the first pusher seat to drive the first gripper cylinder closer to or further away from the sewing station. This automatic sewing device for umbrella surface ties can improve the processing efficiency of the ties.

Description

Technical Field

[0001] This application relates to the technical field of umbrella surface processing, and in particular to an automatic sewing device for umbrella surface straps. Background Technology

[0002] An umbrella is a tool that can shield from rain, sun, and snow. The material used to make the umbrella surface is usually a stretchy fabric. Straps are sewn onto the umbrella surface so that the umbrella surface can be tied and fixed when not in use, thus restraining the umbrella surface.

[0003] Reference Figure 1 In the prior art, the strap includes a strip of fabric 8 and a Velcro fastener. The female patch of the Velcro fastener is sewn to one end of the front side of the strip of fabric 8 (hereinafter defined as the female end of the strip of fabric 8), and the male patch of the Velcro fastener is sewn to the other end of the back side of the strip of fabric 8 (hereinafter defined as the male end of the strip of fabric 8). The female end of the strip of fabric 8 is used to sew onto the umbrella surface. When the umbrella surface is not in use, the male end of the strip of fabric 8 is pulled and the strip of fabric 8 is wrapped around the outer periphery of the umbrella surface. Then the male patch of the Velcro fastener is attached to the female patch of the Velcro fastener, so that the strip of fabric 8 forms a loop, thereby binding the umbrella surface.

[0004] However, in processing this type of tie, workers need to cut strips of fabric of a specific length, a hook and loop fastener of a specific size, and a hook and loop fastener of a specific size. Then, they align the hook and loop fastener of the female end with the female end of the fabric strip and the hook and loop fastener of the male end with the male end of the fabric strip, and sew them together using a sewing machine. This process is inefficient and not suitable for mass production of tie, so further improvements are needed. Summary of the Invention

[0005] To improve the processing efficiency of tie-up straps, this application provides an automatic sewing device for umbrella tie-up straps.

[0006] The automatic sewing device for umbrella surface straps provided in this application adopts the following technical solution:

[0007] An automatic sewing device for umbrella fabric ties includes a worktable. The worktable is equipped with a sewing machine, a feeding assembly for conveying Velcro, a feeding assembly for conveying fabric strips, and a cutting assembly for cutting the fabric strips. The worktable has a first unwinding roller for feeding the fabric strips. The feeding assembly includes a first pusher seat, a first gripper cylinder, and a first drive component. The first pusher seat is slidably mounted on the worktable, and the first gripper cylinder is rotatably connected to the first pusher seat to grip the fabric strip. The sewing machine has a sewing station, and the first drive component is connected to the first pusher seat to drive the first gripper cylinder closer to or further away from the sewing station.

[0008] By adopting the above technical solution, through the setting of the feeding assembly, the fabric feeding assembly, and the cutting assembly, the feeding assembly first transports the female patch of the hook and loop fastener to the sewing station of the sewing machine. Then, the first gripper cylinder clamps the fabric strip, and the first drive unit drives the first pusher to move, causing the first gripper cylinder to pull the female end of the fabric strip to the sewing station for sewing, so that the female patch of the hook and loop fastener is sewn to the female end of the fabric strip. Next, the first pusher is driven to return to the initial position, and the first gripper cylinder clamps the fabric strip again. Then, the cutting assembly cuts the fabric strip to form the female end of the fabric strip. Then, the first gripper cylinder is rotated to turn the fabric strip over. At this time, the female patch of the hook and loop fastener is transported to the sewing station of the sewing machine. Then, the fabric strip is transported to the sewing machine again, so that the female end of the fabric strip moves to the sewing station for sewing the female patch of the hook and loop fastener to form a binding strap. This process is repeated, thereby mass-producing binding straps and greatly improving the processing and production efficiency of binding straps.

[0009] Optionally, a cutting seat is provided between the first unwinding roller and the sewing machine, the cutting seat having a first channel for the fabric strip to pass through; the cutting assembly includes a first cutter, a first cutting cylinder, and a second gripper cylinder, one side of the first cutter is hinged to the cutting seat and located at the outlet end of the first channel, the first cutting cylinder is connected to the first cutter to drive the first cutter to cut the fabric strip; the second gripper cylinder is located on the side of the first cutter near the sewing machine, and when the first cutter cuts the fabric strip, the second gripper cylinder clamps the fabric strip.

[0010] By adopting the above technical solution, with the configuration of the first cutter, the first cutting cylinder, and the second gripper cylinder, when the female patch of the Velcro is sewn onto the female end of the fabric strip, the first gripper cylinder is moved to the initial position. During the movement of the first gripper cylinder, the fabric strip is clamped by the second gripper cylinder to keep the fabric strip taut, so that the first gripper cylinder can clamp the fabric strip again. At the same time, while the fabric strip is taut, the first cutting cylinder drives the first cutter to cut the fabric strip, forming the female end of the fabric strip.

[0011] Optionally, the first pusher seat is equipped with a rotary cylinder, and the first gripper cylinder is connected to the output end of the rotary cylinder. The first gripper cylinder is rotatably mounted on the first pusher seat via the rotary cylinder. The worktable is respectively provided with a first pusher cylinder and a second pusher cylinder. When the female patch of the Velcro is sewn onto the fabric strip, the first pusher cylinder is used to push the fabric strip so that the female end of the fabric strip is disengaged from the sewing station. The output end of the second pusher cylinder is connected to a third gripper cylinder for clamping the fabric strip. The worktable has a material drop port. When the female patch of the Velcro is sewn onto the fabric strip, the third gripper cylinder clamps the fabric strip, and the second pusher cylinder drives the third gripper cylinder to move to the material drop port.

[0012] By adopting the above technical solution, the first pushing cylinder delivers the female end of the fabric strip to the sewing station and sews it with the female patch of the Velcro. The first pushing cylinder then pushes the fabric strip, causing the female end to detach from the sewing station. The rotating cylinder, after the fabric strip is cut, drives the first gripper cylinder to rotate, allowing it to flip the cut fabric strip and attach the female patch of the Velcro to the back of the strip. The second pushing cylinder delivers the female end of the fabric strip to the sewing station, where the third gripper cylinder clamps it. After the female patch of the Velcro is sewn to the female end, the second pushing cylinder drives the third gripper cylinder to move to the material dropper, causing the female end to detach from the sewing station and be led outwards from the material dropper. This significantly improves the overall production efficiency of the structure.

[0013] Optionally, the feeding assembly includes a feeding slide, a second pusher, and a second drive. The outlet end of the feeding slide faces the sewing station for feeding the hook and loop fastener female or hook and loop fastener female. The second pusher is slidably mounted on the feeding slide and is hinged to a pressing block. The second pusher is provided with a third push cylinder for driving the pressing block to press against the hook and loop fastener female or hook and loop fastener female. The second drive is connected to the second pusher for driving the second pusher closer to or away from the sewing station.

[0014] By adopting the above technical solution, through the setting of the feeding slide, the second pusher and the second drive, the female patch or the female patch of the hook and loop fastener is fed to the feeding slide. The third push cylinder drives the pressing block to press down on the female patch or the female patch. Then, the second drive drives the second pusher to push towards the outlet end of the feeding slide, so that the pressing block can push the female patch or the female patch to the sewing station.

[0015] Optionally, the workbench is provided with a feeding seat, and the feeding seat is provided with a second unwinding roller for winding the hook and loop fastener mother sticker and a third unwinding roller for winding the hook and loop fastener daughter sticker on the side away from the feeding slide; the feeding seat has a second channel for conveying the hook and loop fastener mother sticker and a third channel for conveying the hook and loop fastener daughter sticker, and the outlet ends of the second channel and the third channel are both connected to the feeding slide; the feeding seat is provided with a second cutter for cutting the hook and loop fastener mother sticker or the hook and loop fastener daughter sticker.

[0016] By adopting the above technical solution, through the setting of the feeding seat, the long strip of hook and loop fastener mother patch is wound around the second unwinding roller, and the long strip of hook and loop fastener daughter patch is wound around the third unwinding roller. The hook and loop fastener mother patch is conveyed through the second channel of the feeding seat, and the hook and loop fastener daughter patch is conveyed through the third channel. Then, the hook and loop fastener mother patch or hook and loop fastener daughter patch is cut by the second cutter to form hook and loop fastener mother patch or hook and loop fastener daughter patch of a specific size. The exit ends of the second channel and the exit ends of the third channel are both connected to the feeding slide, so that the cut hook and loop fastener mother patch or hook and loop fastener daughter patch can enter the feeding slide, so as to push the cut hook and loop fastener mother patch or hook and loop fastener daughter patch to the sewing station, which greatly improves the overall production efficiency of the structure.

[0017] Optionally, the first driving component includes a drive screw and a drive motor. The drive screw is rotatably mounted on the worktable, and both ends of the drive screw extend along the conveying direction of the fabric strip. The drive screw is slidably fitted with a sliding seat, and the sliding seat is threadedly connected to the drive screw. The first push seat is connected to the sliding seat. The drive motor is connected to the drive screw to drive the drive screw to rotate.

[0018] By adopting the above technical solution, through the setting of the drive screw and drive motor, the drive motor drives the drive screw to rotate, so that the first pusher can slide along the axial direction of the drive screw. By controlling the forward and reverse rotation of the drive motor, the first pusher can slide back and forth along the axial direction of the drive screw, thereby enabling the first gripper cylinder to repeatedly pull the fabric strip to the sewing station for sewing.

[0019] Optionally, the workbench is provided with a reversing seat, which is provided with a first conductive block, a second conductive block, a first contact block, and a second contact block. The first conductive block and the second conductive block are both installed on the inner wall of the reversing seat. The first contact block is slidably installed on the reversing seat to move closer to or away from the first conductive block. When the first contact block abuts against the first conductive block, the first gripper cylinder pulls the female end of the fabric strip to the sewing station and switches the rotation direction of the drive motor output shaft. The second contact block is slidably installed on the reversing seat to move closer to or away from the second conductive block. When the second contact block abuts against the second conductive block, the first gripper cylinder moves between the first cutter and the second gripper cylinder and switches the rotation direction of the drive motor output shaft. The reversing seat is provided with a linkage for driving the first contact block and the second contact block to slide.

[0020] By adopting the above technical solution, through the arrangement of the first conductive block, the second conductive block, the first contact block, and the second contact block, when the first gripper cylinder moves the fabric strip to the sewing station, the first contact block abuts against the first conductive block to shut down the drive motor and switch the rotation direction of the drive motor output shaft, allowing the first gripper cylinder to move away from the sewing station to continue gripping the next fabric strip; when the first gripper cylinder moves between the first cutter and the second gripper cylinder, the second contact block abuts against the second conductive block to shut down the drive motor and switch the rotation direction of the drive motor output shaft again, allowing the first gripper cylinder to grip the next fabric strip and pull it closer to the sewing station. This process is repeated to perform large-volume fabric strip processing; the arrangement of the first and second contact blocks, and the timely switching of the drive motor output shaft's direction, improves the overall structural stability.

[0021] Optionally, the reversing seat is rotatably mounted with a linkage roller, which is coaxially connected to the drive screw. The linkage component includes a first linkage rod, a second linkage rod, a first push ring, and a second push ring. The first and second linkage rods are both mounted on the reversing seat and kept parallel to the linkage roller. The first contact block is slidably sleeved on the first linkage rod, and the second contact block is slidably sleeved on the second linkage rod. The first push ring is slidably sleeved on the first linkage rod to push the first contact block to slide, and the second push ring is slidably sleeved on the second linkage rod to push the second contact block to slide. The first push ring and the linkage roller, and the second push ring and the linkage roller are both meshed and driven. The first push ring and the first linkage rod, and the second push ring and the second linkage rod are both threadedly connected, and the threads of the first push ring and the first linkage rod, and the threads of the second push ring and the second linkage rod are arranged in opposite directions.

[0022] By adopting the above technical solution, through the arrangement of the first linkage rod, the second linkage rod, the first push ring, and the second push ring, the linkage roller is coaxially connected to the drive screw, enabling the linkage roller to rotate synchronously with the drive screw. When the output shaft of the drive motor rotates forward, the first push ring meshes with the linkage roller, and the first push ring is threadedly connected to the first linkage rod, thereby driving the first push ring to move towards the side closer to the first contact block, so as to push the first contact block towards the side closer to the first conductive block (at this time, the second push ring moves away from the second contact block). After the first contact block abuts against the first conductive block, the output shaft of the drive motor switches direction, driving the second... The push ring moves towards the side closer to the second contact block, pushing the second contact block towards the side closer to the second conductive block (at this time, the first push ring moves away from the first contact block). After the second contact block and the second conductive block come into contact, the output shaft of the drive motor rotates again, thus switching directions. This process is repeated so that the first gripper cylinder can slide back and forth, thereby continuously pulling the fabric strip to the sewing station for stitching. The moving distances of the first push ring and the second push ring determine the moving distance of the first gripper cylinder, enabling the first gripper cylinder to accurately pull the fabric strip to the sewing station, greatly improving the overall structural precision and thus ensuring the processing quality of the strap.

[0023] Optionally, both the first linkage rod and the second linkage rod are rotatably mounted on the reversing seat. One end of the first linkage rod is coaxially connected to a first gear, and one end of the second linkage rod is coaxially connected to a second gear. The first gear and the second gear mesh and drive each other. The first gear is provided with a locking fastener for limiting the circumferential rotation of the first gear.

[0024] By adopting the above technical solution, the locking fastener limits the first gear under normal conditions, preventing it from rotating circumferentially. This, in turn, prevents the first and second linkage rods from rotating circumferentially, thus determining the initial positions of the first and second pushing rings. When it is necessary to adjust the initial positions of the first and second pushing rings, the locking action on the first gear is released, and the first gear is driven to rotate. The arrangement of the first and second gears allows the first and second linkage rods to rotate synchronously, thereby synchronously adjusting the initial positions of the first and second pushing rings (the movement directions of the first and second pushing rings are consistent). After the initial positions of the first and second pushing rings change, the maximum movement of the first and second pushing rings also changes, which in turn changes the movement of the first gripper cylinder. In conjunction with the first cutter, the length of the fabric strip can be adjusted, enabling the overall structure to process straps of different lengths, greatly improving the adaptability of the overall structure.

[0025] Optionally, the surface of the first gear is provided with a plurality of first connecting holes, all of which are arranged at intervals around the axial direction of the first gear, and the reversing seat is provided with a second connecting hole near the side wall of the first gear; the locking fastener includes a locking rod, which is inserted into the first connecting hole and the second connecting hole in sequence and is threadedly connected to the second connecting hole.

[0026] By adopting the above technical solution, the locking rod is normally threadedly connected to the second connecting hole, thereby locking the first gear and restricting its circumferential rotation. When it is necessary to adjust the initial position of the first and second pushing rings, the locking rod is rotated to disengage from the second connecting hole. Then, the locking rod drives the first gear to rotate, and the first and second gear mesh to drive the first and second linkage rods to rotate synchronously, thereby adjusting the initial position of the first and second pushing rings and improving the convenience of adjusting their initial positions.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] 1. By configuring the applicator, fabric feeding assembly, and cutting assembly, the applicator first feeds the female patch of the hook and loop fastener to the sewing station of the sewing machine. Then, the first gripper cylinder clamps the fabric strip, and the first drive unit drives the first pusher to move, causing the first gripper cylinder to pull the female end of the fabric strip to the sewing station for sewing, thus sewing the female patch of the hook and loop fastener to the female end of the fabric strip. Next, the first pusher is driven back to its initial position, and the first gripper cylinder clamps the fabric strip again. Then, the cutting assembly cuts the fabric strip to form the female end of the fabric strip. Next, the first gripper cylinder is rotated to flip the fabric strip over, at which point the female patch of the hook and loop fastener is fed to the sewing station of the sewing machine. Then, the fabric strip is fed to the sewing machine again, causing the female end of the fabric strip to move to the sewing station for sewing the female patch of the hook and loop fastener to form a binding strap. This process is repeated, thereby mass-producing binding straps and greatly improving the processing efficiency of binding straps.

[0029] 2. By configuring the first conductive block, the second conductive block, the first contact block, and the second contact block, when the first gripper cylinder moves the fabric strip to the sewing station, the first contact block abuts against the first conductive block to shut down the drive motor and switch the rotation direction of the drive motor output shaft, allowing the first gripper cylinder to move away from the sewing station to continue gripping the next fabric strip; when the first gripper cylinder moves between the first cutter and the second gripper cylinder, the second contact block abuts against the second conductive block to shut down the drive motor and switch the rotation direction of the drive motor output shaft again, allowing the first gripper cylinder to grip the next fabric strip and pull it closer to the sewing station. This process is repeated to perform large-volume fabric strip processing; the configuration of the first and second contact blocks allows for timely switching of the drive motor output shaft's direction, improving the overall structural stability.

[0030] 3. By setting the first gear and the second gear, under normal conditions, the locking fastener limits the first gear, preventing it from rotating circumferentially. This, in turn, prevents the first and second linkage rods from rotating circumferentially, thus determining the initial positions of the first and second pushing rings. When it is necessary to adjust the initial positions of the first and second pushing rings, the locking action on the first gear is released, and the first gear is driven to rotate. The setting of the first gear and the second gear allows the first and second linkage rods to rotate synchronously, thereby synchronously adjusting the initial positions of the first and second pushing rings (the movement directions of the first and second pushing rings are the same). After the initial positions of the first and second pushing rings change, the maximum movement of the first and second pushing rings changes, which in turn changes the movement of the first gripper cylinder. In conjunction with the first cutter, the length of the fabric strip can be adjusted, enabling the overall structure to process straps of different lengths, greatly improving the adaptability of the overall structure. Attached Figure Description

[0031] Figure 1 This is a structural diagram illustrating the fabric strips and Velcro in the background technology;

[0032] Figure 2 This is a schematic diagram of the overall structure of Example 1;

[0033] Figure 3 This is a schematic diagram illustrating the structure of the adhesive feeding component in Example 1;

[0034] Figure 4 This is a schematic diagram illustrating the structure of the cutting assembly and the fabric feeding assembly in Embodiment 1;

[0035] Figure 5 This is a partial cross-sectional view of Embodiment 2 illustrating the first driving component;

[0036] Figure 6 This is a partial sectional view of the internal structure of the commutator in Embodiment 2;

[0037] Figure 7 This is a partial cross-sectional view of the locking bolt in Example 2;

[0038] Figure 8 This is a partial cross-sectional view of the abutment bolt in Example 2;

[0039] Figure 9 This is a partial cross-sectional view of Embodiment 3 illustrating the first and second gears;

[0040] Figure 10 This is a partial cross-sectional view of Embodiment 3 showing the first connecting hole.

[0041] Explanation of reference numerals in the attached drawings: 1. Workbench; 11. First unwind roller; 12. Cutting seat; 121. First channel; 122. Correcting strip; 123. Rotating shaft; 124. Abutting bolt; 13. First push cylinder; 131. Lower push plate; 14. Second push cylinder; 15. Third gripper cylinder; 16. Material drop port; 17. Feeding seat; 171. Second unwind roller; 172. Third unwind roller; 173. Second channel; 174. Third channel; 175. Second cutter; 176. Conveyor roller; 18. Slide rail; 2. Sewing machine; 21. Sewing station; 3. Feeding assembly; 31. Feeding slide; 32. Second push seat; 321. Pressing block; 322. Third push cylinder; 323. Turning frame; 33. Second drive component; 4. Fabric feeding assembly; 41. First push seat; 42. First gripper cylinder; 43. First drive component; 431. Drive screw; 432. Drive motor; 433. Sliding seat; 44. Rotary cylinder; 5. Cutting assembly; 51. First cutter; 52. First cutting cylinder; 53. Second gripper cylinder; 6. Reversing seat; 61. First conductive block; 62. Second conductive block; 63. First contact block; 64. Second contact block; 65. Linkage roller; 66. Second connecting hole; 67. Return spring; 68. Docking hole; 7. Linkage component; 71. First linkage rod; 72. Second linkage rod; 73. First push ring; 74. Second push ring; 75. First gear; 751. First connecting hole; 76. Second gear; 77. Locking rod; 78. Locking bolt; 8. Fabric strip. Detailed Implementation

[0042] The following is in conjunction with the appendix Figure 2-10 This application will be described in further detail.

[0043] Example 1:

[0044] This application discloses an automatic sewing device for umbrella surface straps.

[0045] Reference Figure 2An automatic sewing device for umbrella surface ties includes a workbench 1, on which a sewing machine 2, a patch feeding assembly 3, a fabric feeding assembly 4, and a cutting assembly 5 are respectively arranged. The sewing machine 2 is fixedly installed on the upper surface of the workbench 1. The sewing machine 2 is used to sew the female patch of the Velcro to the female end of the fabric strip and the female patch of the Velcro to the male end of the fabric strip. The sewing machine 2 is a prior art structure, and its structure will not be described in detail here. The sewing machine 2 has a sewing station 21.

[0046] Reference Figure 2 , Figure 3 The feeding assembly 3 is used to feed the hook and loop fasteners, specifically the female and female hook and loop fasteners, to the sewing station 21. The feeding assembly 3 includes a feeding slide 31, a second pusher 32, and a second drive 33. The feeding slide 31 is fixedly installed on the upper surface of the workbench 1 and located on one side of the sewing machine 2. The feeding slide 31 is made of a long strip of thin metal sheet, and the two sides of the metal sheet in the width direction are bent to form the feeding slide 31. The outlet end of the feeding slide 31 faces the sewing station 21 and connects to the sewing station 21. The feeding slide 31 is used to feed the female or female hook and loop fasteners.

[0047] Reference Figure 2 , Figure 3 The second pusher seat 32 is slidably mounted on the feeding slide 31. A flipping frame 323 is hinged to the side wall of the second pusher seat 32. A pressing block 321 is fixedly connected to the flipping frame 323. The pressing block 321 is used to press the female or female hook and loop fastener against the feeding slide 31. A third push cylinder 322 is mounted on the second pusher seat 32. The cylinder body of the third push cylinder 322 is hinged to the side wall of the second pusher seat 32. The piston rod of the third push cylinder 322 is hinged to the flipping frame 323, which drives the piston rod of the third push cylinder 322 to extend outward, thereby driving the pressing block 321 to press against the female or female hook and loop fastener located in the feeding slide 31. A second drive member 33 is mounted on the upper surface of the workbench 1 and connected to the second pusher seat 32. The second drive member 33 is used to drive the second pusher seat 32 to move closer to or away from the sewing station 21.

[0048] Reference Figure 2 , Figure 3A feeding seat 17 is fixedly installed on the workbench 1. The feeding seat 17 is located on one side of the feeding slide 31. On the side of the feeding seat 17 away from the feeding slide 31, a second unwinding roller 171 and a third unwinding roller 172 are rotatably installed respectively. The second unwinding roller 171 is used for winding the female sticker of the hook and loop fastener, and the third unwinding roller 172 is used for winding the female sticker of the hook and loop fastener. The feeding seat 17 has a second channel 173 and a third channel 174. The second channel 173 is used for conveying the female sticker of the hook and loop fastener, and the third channel 174 is used for conveying the female sticker of the hook and loop fastener. A conveying roller 176 is rotatably installed in both the second channel 173 and the third channel 174. The feeding seat 17 is equipped with a conveying motor (not shown in the figure). The output shaft of the conveying motor is coaxially connected to the conveying roller 176 to drive the conveying roller 176 to rotate, so that the second channel 173 can convey the female sticker of the hook and loop fastener, and the third channel 174 can convey the female sticker of the hook and loop fastener.

[0049] Reference Figure 2 , Figure 3 In this embodiment, the outlet ends of the second channel 173 and the third channel 174 are both connected to the feeding slide 31. A second cutter 175 is installed on the side wall of the feeding seat 17 near the feeding slide 31. One side of the second cutter 175 is hinged to the side wall of the feeding seat 17 near the feeding slide 31. A second cutting cylinder (not shown in the figure) is installed on the feeding seat 17. The cylinder body of the second cutting cylinder is hinged to the side wall of the feeding seat 17, and the piston rod of the second cutting cylinder is hinged to the second cutter 175 so that the second cutter 175 can cut the Velcro mother sticker conveyed by the second channel 173 and the Velcro daughter sticker conveyed by the third channel 174.

[0050] With this design, the hook and loop fastener mother patch wound on the second unwind roller 171 is conveyed to the feeding slide 31 via the second channel 173. At this time, the hook and loop fastener mother patch is pressed by the pressing block 321, and then the second cutter 175 is driven to cut the hook and loop fastener mother patch to obtain a hook and loop fastener mother patch of a specific size. Then, the pressing block 321 is driven to move closer to the sewing station 21 to push the hook and loop fastener mother patch of a specific size to the sewing station 21. The hook and loop fastener daughter patch wound on the third unwind roller 172 is conveyed to the feeding slide 31 via the third channel 174. At this time, the hook and loop fastener daughter patch is pressed by the pressing block 321, and then the second cutter 175 is driven to cut the hook and loop fastener daughter patch to obtain a hook and loop fastener daughter patch of a specific size. Then, the pressing block 321 is driven to move closer to the sewing station 21 to push the hook and loop fastener daughter patch of a specific size to the sewing station 21.

[0051] Reference Figure 2 , Figure 4A first unwinding roller 11 is rotatably mounted on the worktable 1. The first unwinding roller 11 is located on the side of the sewing machine 2 away from the feeding slide 31. The first unwinding roller 11 is used to feed the fabric strips. A cutting seat 12 is fixedly mounted on the worktable 1. The cutting seat 12 is located between the first unwinding roller 11 and the sewing machine 2. Two correction strips 122 are installed on the top wall of the cutting seat 12. In this embodiment, the two correction strips 122 are detachably installed on the cutting seat 12 by bolt fixing. The two ends of the two correction strips 122 extend along the length direction of the feeding slide 31. A first channel 121 for the fabric strip to pass through is formed between the two correction strips 122. A conveyor roller (not shown in the figure) for conveying the fabric strip is rotatably mounted in the first channel 121. A drive motor (not shown in the figure) is installed on the cutting seat 12. The output shaft of the drive motor is coaxially connected to the conveyor roller. The drive motor is used to drive the conveyor roller to rotate to convey the fabric strip.

[0052] Reference Figure 2 , Figure 4 The cutting assembly 5 is used to cut the fabric strip to obtain a fabric strip of a specific length. The cutting assembly 5 includes a first cutter 51, a first cutting cylinder 52, and a second gripper cylinder 53. One side of the first cutter 51 is hinged to the cutting seat 12 and located at the outlet end of the first channel 121. The cylinder body of the first cutting cylinder 52 is hinged to the cutting seat 12, and the piston rod of the first cutting cylinder 52 is hinged to the first cutter 51. When the piston rod of the first cutting cylinder 52 extends outward, the first cutter 51 cuts the fabric strip. The cylinder body of the second gripper cylinder 53 is fixed to the side wall of the cutting seat 12 near the sewing machine 2. The second gripper cylinder 53 is located on the side of the first cutter 51 near the sewing machine 2. When the first cutter 51 cuts the fabric strip, the second gripper cylinder 53 clamps the fabric strip so that the second cutter 175 can cut the fabric strip.

[0053] Reference Figure 2 , Figure 4 The fabric feeding assembly 4 is used to feed the fabric strip from the cutting seat 12 to the sewing station 21 of the sewing machine 2. The fabric feeding assembly 4 includes a first push seat 41, a first gripper cylinder 42, and a first drive component 43. A slide rail 18 is fixedly installed on the upper surface of the worktable 1. Both ends of the slide rail 18 extend along the fabric feeding direction. The first push seat 41 is slidably installed on the slide rail 18. A rotary cylinder 44 is fixedly installed on the first push seat 41 near the side wall of the sewing machine 2. The first gripper cylinder 42 is connected to the output end of the rotary cylinder 44. The first gripper cylinder 42 is rotatably installed on the first push seat 41 through the rotary cylinder 44 to grip the fabric strip.

[0054] Reference Figure 3 , Figure 4The first driving component 43 is connected to the first pushing seat 41 to drive the first gripper cylinder 42 to approach or move away from the sewing station 21. The first driving component 43 and the second driving component 33 can be configured as linear motors or as conveyor belts. In this embodiment, both the first driving component 43 and the second driving component 33 are configured as conveyor belts, that is, the conveyor belt is installed on the upper surface of the workbench 1, and the first pushing seat 41 or the second pushing seat 32 is fixedly connected to the surface of the conveyor belt. Driving the conveyor belt to run can drive the first pushing seat 41 or the second pushing seat 32 to move. Conveyor belt conveying is a common method in the art, and the structure of conveyor belt conveying will not be described in detail here.

[0055] Reference Figure 2 , Figure 4 In this embodiment, a first pushing cylinder 13 and a second pushing cylinder 14 are respectively arranged above the workbench 1. The cylinder body of the first pushing cylinder 13 is fixedly installed on the side wall of the sewing machine 2, and the first pushing cylinder 13 is located on the side of the sewing machine 2 away from the feeding slide 31. The first pushing cylinder 13 is vertically arranged, and the piston rod of the first pushing cylinder 13 is fixedly connected to the lower push plate 131. When the female patch of the Velcro is sewn onto the fabric strip, the first pushing cylinder 13 pushes the fabric strip through the lower push plate 131 and causes the female end of the fabric strip to leave the sewing station 21.

[0056] Reference Figure 2 , Figure 4 The cylinder body of the second push cylinder 14 is fixedly installed on the upper surface of the workbench 1. The axial direction of the piston rod of the second push cylinder 14 is consistent with the conveying direction of the fabric strip. The piston rod of the second push cylinder 14 is fixedly connected to the third gripper cylinder 15, which is used to grip the fabric strip. The upper surface of the workbench 1 is provided with a material discharge port 16 that passes through the workbench 1. When the Velcro sub-attachment is sewn onto the fabric strip, the third gripper cylinder 15 grips the fabric strip, and the second push cylinder 14 drives the third gripper cylinder 15 to move to the discharge port.

[0057] The implementation principle of Embodiment 1 of this application is as follows: During the production of the binding strap, the cut Velcro mother patch is transported to the sewing station 21 of the sewing machine 2 by the pressure block 321. The first gripper cylinder 42 clamps the mother end of the fabric strip and pulls it toward the sewing station 21, so that the mother end of the fabric strip moves to be aligned with the Velcro mother patch for sewing.

[0058] Then, the first gripper cylinder 42 is driven to return to its initial position and clamp the fabric strip again. The first cutter 51 cuts the fabric strip to form the sub-end of the fabric strip (at this time, the first gripper cylinder 42 clamps the sub-end of the fabric strip). The first gripper cylinder 42 is driven to flip by the rotary motor to turn the fabric strip over. During this process, the cutting Velcro sub-attachment is transported to the sewing station 21 of the sewing machine 2 by the pressure block 321. Then, the first gripper cylinder 42 is pushed to the sewing station 21 to move the sub-end of the fabric strip to align with the sub-attachment of the Velcro for sewing.

[0059] The entire process involves sewing the female patch of the hook and loop fastener to the front of the female end of the fabric strip and sewing the male patch of the hook and loop fastener to the back of the male end of the fabric strip, thus completing the processing and production of one strap. By repeating the above operations, straps can be mass-produced, greatly improving the processing and production efficiency of straps.

[0060] Example 2:

[0061] This application discloses an automatic sewing device for umbrella surface straps.

[0062] Reference Figure 5 The difference between the automatic sewing device for umbrella straps disclosed in this application and Embodiment 1 is that:

[0063] In this embodiment, the first driving component 43 includes a driving screw 431 and a driving motor 432. The driving screw 431 is rotatably mounted on the worktable 1, and both ends of the driving screw 431 extend along the conveying direction of the fabric strip. The driving screw 431 is slidably fitted with a sliding seat 433, and the sliding seat 433 is threadedly connected to the driving screw 431. The first push seat 41 and the sliding seat 433 are detachably connected by bolts (the connection structure between the first push seat 41 and the sliding seat 433 is not shown in the figure). The first push seat 41 is slidably mounted on the worktable 1 through the driving screw 431. The driving motor 432 is fixedly mounted on the upper surface of the worktable 1, and the output shaft of the driving motor 432 is coaxially connected to the driving screw 431 to drive the driving screw 431 to rotate.

[0064] Reference Figure 5 , Figure 6A reversing seat 6 is fixedly installed on the upper surface of the workbench 1. The reversing seat 6 is located on the side of the drive screw 431 away from the drive motor 432. A first conductive block 61, a second conductive block 62, a first contact block 63, and a second contact block 64 are respectively installed inside the reversing seat 6. The drive motor 432 is connected to a controller (not shown in the figure). The first conductive block 61, the second conductive block 62, the first contact block 63, and the second contact block 64 are all electrically connected to the controller. In this embodiment, the first conductive block 61 and the second conductive block 62 are both fixedly installed on the inner wall of the reversing seat 6. The first contact block 63 is slidably installed on the reversing seat 6 to move closer to or away from the first conductive block 61. When the first contact block 63 contacts the first conductive block 62, the first conductive block 63 and the second contact block 64 are connected to the controller. When blocks 61 abut, the first gripper cylinder 42 pulls the female end of the fabric strip to the sewing station. When the first contact block 63 abuts with the first conductive block 61, the first conductive block 61 sends an electrical signal to the controller, causing the controller to switch the rotation direction of the output shaft of the drive motor 432. The second contact block 64 is slidably mounted on the reversing seat 6 to move closer to or further away from the second conductive block 62. When the second contact block 64 abuts with the second conductive block 62, the first gripper cylinder 42 moves between the first cutter 51 and the second gripper cylinder 53. When the second contact block 64 abuts with the second conductive block 62, the second conductive block 62 sends an electrical signal to the controller, causing the controller to switch the rotation direction of the output shaft of the drive motor 432 again.

[0065] It should be noted that the first conductive block 61 and the second conductive block 62 can be proximity switches, so that when the first contact block 63 abuts against the first conductive block 61 and the second contact block 64 abuts against the second conductive block 62, the first conductive block 61 and the second conductive block 62 can respectively trigger the controller, which can then control the direction of the output shaft of the drive motor 432.

[0066] Reference Figure 6 A linkage roller 65 is rotatably mounted on the reversing seat 6. One end of the linkage roller 65 extends out of the reversing seat 6 and is coaxially connected to the drive screw 431. The reversing seat 6 is equipped with a linkage component 7 for driving the first contact block 63 and the second contact block 64 to slide. The linkage component 7 includes a first linkage rod 71, a second linkage rod 72, a first push ring 73, and a second push ring 74. The first linkage rod 71 and the second linkage rod 72 are both mounted on the reversing seat 6. The first linkage rod 71 and the second linkage rod 72 are symmetrically arranged on both sides of the linkage roller 65 and are parallel to the axial direction of the linkage roller 65. The first contact block 63 is slidably sleeved on the first linkage rod 71 and is slidably mounted on the reversing seat 6 through the first linkage rod 71. The second contact block 64 is slidably sleeved on the second linkage rod 72 and is slidably mounted on the reversing seat 6 through the second linkage rod 72.

[0067] Reference Figure 6The first pushing ring 73 is slidably sleeved on the first linkage rod 71 to push the first contact block 63 to slide. The first pushing ring 73 is engaged with the linkage roller 65 for transmission, and the first pushing ring 73 is threadedly connected to the first linkage rod 71. The second pushing ring 74 is slidably sleeved on the second linkage rod 72 to push the second contact block 64 to slide. The second pushing ring 74 is engaged with the linkage roller 65 for transmission, and the second pushing ring 74 is threadedly connected to the second linkage rod 72. In this embodiment, the threads between the first pushing ring 73 and the first linkage rod 71, and between the second pushing ring 74 and the second linkage rod 72, are arranged in opposite directions.

[0068] It should be noted that, in this embodiment, a return spring 67 is installed between the first contact block 63 and the inner wall of the commutator 6, and between the second contact block 64 and the inner wall of the commutator 6. The return spring 67 normally separates the first contact block 63 and the first conductive block 61, and the second contact block 64 and the second conductive block 62 from each other.

[0069] Reference Figure 6 , Figure 7 In this embodiment, both the first linkage rod 71 and the second linkage rod 72 are rotatably mounted on the reversing seat 6 so that they can rotate circumferentially around their own axis. Both the first linkage rod 71 and the second linkage rod 72 are connected with locking bolts 78, which are used to restrict the circumferential rotation of the first linkage rod 71 or the second linkage rod 72. Specifically, the top wall of the reversing seat 6 is provided with a mating hole 68, and the locking bolt 78 passes through the mating hole 68 and abuts against the circumferential wall of the first linkage rod 71 or the circumferential wall of the second linkage rod 72. The locking bolt 78 and the mating hole 68 are threadedly connected.

[0070] Reference Figure 8 It is particularly noteworthy that, in this embodiment, the cutting seat 12 is rotatably mounted with a rotating shaft 123, the axial direction of which extends along the conveying direction of the fabric strip. The first cutter 51 is slidably sleeved on the rotating shaft 123, and one side of the first cutter 51 is hinged to the cutting seat 12 via the rotating shaft 123. An abutment bolt 124 is installed between the first cutter 51 and the rotating shaft 123, and the first cutter 51 and the rotating shaft 123 are connected and fixed to each other by the abutment bolt 124. The relative position between the first cutter 51 and the rotating shaft 123 can be adjusted by the abutment bolt 124.

[0071] The implementation principle of Embodiment 2 of this application is as follows: when the drive screw 431 drives the first gripper cylinder 42 to approach or move away from the sewing station 21, the drive screw 431 drives the linkage roller 65 to rotate synchronously; the threads between the first push ring 73 and the first linkage rod 71, and between the second push ring 74 and the second linkage rod 72 are arranged in opposite directions, so that when the linkage roller 65 rotates, the movement directions of the first push ring 73 and the second push ring 74 are opposite.

[0072] When the drive screw 431 drives the first gripper cylinder 42 to move to the sewing station 21 (i.e., pulls the female end of the fabric strip into the sewing station 21), the first contact block 63 abuts against the first conductive block 61 under the push of the first push ring 73 (at this time, the second push ring 74 moves away from the second contact block 64), so as to shut down the drive motor 432 and switch the rotation direction of the output shaft of the drive motor 432; the change in the direction of the drive screw 431 drives the first gripper cylinder 42 to move away from the sewing station 21. At this time, the second push ring 74 moves towards the side closer to the second contact block 64. When the second contact block 64 abuts against the second conductive block 62, the drive motor 432 is turned off and the rotation direction of the output shaft of the drive motor 432 is switched again (at this time, the first gripper cylinder 42 can pull the end of the fabric strip toward the sewing station 21). This is repeated to carry out the processing of a large number of fabric strips. The setting of the first contact block 63 and the second contact block 64, and the timely switching of the rotation direction of the output shaft of the drive motor 432, improves the stability of the overall structure.

[0073] The movement of the first push ring 73 and the second push ring 74 determines the movement of the first gripper cylinder 42. By loosening the first linkage rod 71 and the second linkage rod 72 through the locking bolt 78 and rotating the first linkage rod 71 and the second linkage rod 72, the initial positions of the first push ring 73 and the second push ring 74 can be adjusted, thereby adjusting the movement of the first gripper cylinder 42. In conjunction with the position adjustment of the first cutter 51, the length of the cut fabric strip can be controlled, enabling the overall structure to process straps of different lengths (i.e., the length of the fabric strip is adjustable), greatly improving the adaptability of the overall structure.

[0074] Example 3:

[0075] This application discloses an automatic sewing device for umbrella surface straps.

[0076] Reference Figure 9 The difference between the automatic sewing device for umbrella straps disclosed in this application and embodiment 2 is that:

[0077] In this embodiment, the end of the first linkage rod 71 away from the drive screw 431 extends out of the reversing seat 6 and is coaxially connected to the first gear 75. The end of the second linkage rod 72 away from the drive screw 431 extends out of the reversing seat 6 and is coaxially connected to the second gear 76. The first gear 75 and the second gear 76 mesh and transmit power. With this design, driving the first gear 75 to rotate can drive the first linkage rod 71 and the second linkage rod 72 to rotate synchronously, and enable the first push ring 73 and the second push ring 74 to move in the same direction.

[0078] Reference Figure 9 , Figure 10The surface of the first gear 75 is provided with a plurality of first connecting holes 751, all of which are arranged at intervals around the axial direction of the first gear 75. The reversing seat 6 is provided with a second connecting hole 66 near the side wall of the first gear 75, which is opposite to the first connecting hole 751. The first gear 75 is equipped with a locking fastener for limiting the circumferential rotation of the first gear 75. In this embodiment, the locking fastener is set as a locking rod 77, which passes through the first connecting hole 751 and the second connecting hole 66 in sequence and is threadedly connected to the second connecting hole 66.

[0079] The implementation principle of Embodiment 3 of this application is as follows: Under normal conditions, the locking rod 77 is threadedly connected to the second connecting hole 66 to limit the first gear 75 and the second gear 76, thereby restricting the circumferential rotation of the first linkage rod 71 and the second linkage rod 72; when it is necessary to adjust the initial position of the first push ring 73 and the second push ring 74 to adjust the length of the cloth strip, the locking rod 77 is rotated to disengage from the second connecting hole 66, and the first gear 75 can be driven to rotate through the locking rod 77.

[0080] The first gear 75 and the second gear 76 mesh and drive each other, thereby driving the first linkage rod 71 and the second linkage rod 72 to rotate synchronously. The rotation directions of the first linkage rod 71 and the second linkage rod 72 are opposite, so as to drive the first push ring 73 and the second push ring 74 to move in the same direction, thereby synchronously adjusting the initial position of the first push ring 73 and the second push ring 74, which greatly improves the convenience of adjusting the initial position of the first push ring 73 and the second push ring 74.

[0081] The above are preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made to the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An automatic sewing apparatus for a canopy binding, characterized by: The utility model provides a magic tape sewing machine, including workbench (1), workbench (1) respectively is provided with sewing machine (2), is used for conveying magic paste's send paste subassembly (3), is used for conveying cloth strip's send cloth subassembly (4) and is used for cutting cloth strip's cutting subassembly (5), workbench (1) is equipped with first unwinding roller (11) for cloth strip winding, send cloth subassembly (4) includes first push seat (41), first clamping jaw pneumatic cylinder (42) and first drive (43), first push seat (41) slip fit in workbench (1), first clamping jaw pneumatic cylinder (42) rotationally connected in first push seat (41) for clamping cloth strip, sewing machine (2) has sewing work position (21), first drive (43) is connected to first push seat (41) for drive first clamping jaw pneumatic cylinder (42) close or far from sewing work position (21), first unwinding roller (11) and sewing machine (2) between be equipped with cutting seat (12), cutting seat (12) is equipped with first passageway (121) for cloth strip, cutting subassembly (5) includes first cutting knife (51), first cutting pneumatic cylinder (52) and second clamping jaw pneumatic cylinder (53), one side of first cutting knife (51) is hinged to cutting seat (12) and is located first passageway (121) export end, first cutting pneumatic cylinder (52) is connected to first cutting knife (51) for drive first cutting knife (51) cutting cloth strip, second clamping jaw pneumatic cylinder (53) is located first cutting knife (51) close sewing machine (2) one side, when first cutting knife (51) cutting cloth strip, second clamping jaw pneumatic cylinder (53) clamps in cloth strip, first drive (43) includes drive screw rod (431) and drive motor (432), drive screw rod (431) rotationally installed on workbench (1), and both ends of drive screw rod (431) extend along the direction of cloth strip's conveying arrangement, drive screw rod (431) slip cover is equipped with sliding seat (433), sliding seat (433) is connected with drive screw rod (431) between screw thread, first push seat (41) is connected with sliding seat (433), drive motor (432) is connected to drive screw rod (431) for drive drive screw rod (431) rotation, workbench (1) is equipped with reversing seat (6), reversing seat (6) is equipped with first conducting block (61), second conducting block (62), first contact block (63) and second contact block (64) respectively, first conducting block (61) and second conducting block (62) are installed on the inner wall of reversing seat (6), first contact block (63) slip fit in reversing seat (6) for close or far from first conducting block (61), when first contact block (63) and first conducting block (61) are abutted, first clamping jaw pneumatic cylinder (42) will the female end of cloth strip be pulled to sewing work position (21) and switch drive motor (432) output shaft's rotation direction,The second contact block (64) is slidingly installed on the reversing seat (6) for approaching or moving away from the second conductive block (62), when the second contact block (64) abuts against the second conductive block (62), the first clamping jaw cylinder (42) moves to between the first cutter (51) and the second clamping jaw cylinder (53) and switches the rotating direction of the output shaft of the driving motor (432); the reversing seat (6) is provided with a linkage (7) for driving the first contact block (63) and the second contact block (64) to slide.

2. The automatic sewing apparatus for canopy band according to claim 1, wherein: The first pushing seat (41) is provided with a rotating cylinder (44), the first clamping cylinder (42) is connected to the output end of the rotating cylinder (44), and the first clamping cylinder (42) is rotatably installed on the first pushing seat (41) through the rotating cylinder (44); the workbench (1) is respectively provided with a first pushing cylinder (13) and a second pushing cylinder (14), when the female patch of the magic tape is sewn on the cloth strip, the first pushing cylinder (13) is used for pushing the cloth strip to make the female end of the cloth strip separate from the sewing station (21); the output end of the second pushing cylinder (14) is connected with a third clamping cylinder (15) used for clamping the cloth strip, and the workbench (1) is provided with a blanking port (16), when the male patch of the magic tape is sewn on the cloth strip, the third clamping cylinder (15) is clamped on the cloth strip, and the second pushing cylinder (14) drives the third clamping cylinder (15) to shift to the blanking port (16).

3. The automatic sewing apparatus for umbrella rib according to claim 1, wherein: The patch feeding assembly (3) comprises a patch feeding slide (31), a second pushing seat (32) and a second driving member (33), the outlet end of the patch feeding slide (31) faces the sewing station (21) to convey the magic tape female patch or the magic tape male patch; the second pushing seat (32) is slidably installed on the patch feeding slide (31), the second pushing seat (32) is hinged with a pressing block (321), the second pushing seat (32) is provided with a third pushing cylinder (322) used for driving the pressing block (321) to press on the magic tape female patch or the magic tape male patch; the second driving member (33) is connected to the second pushing seat (32) to drive the second pushing seat (32) to approach or move away from the sewing station (21).

4. The automatic sewing apparatus for canopy straps according to claim 3, wherein: The workbench (1) is provided with a patch feeding seat (17), one side of the patch feeding seat (17) away from the patch feeding slide (31) is respectively provided with a second unwinding roller (171) used for winding the magic tape female patch and a third unwinding roller (172) used for winding the magic tape male patch; the patch feeding seat (17) has a second channel (173) used for conveying the magic tape female patch and a third channel (174) used for conveying the magic tape male patch, the outlet end of the second channel (173) and the outlet end of the third channel (174) are communicated with the patch feeding slide (31), and the patch feeding seat (17) is provided with a second cutter (175) used for cutting the magic tape female patch or the magic tape male patch.

5. The automatic sewing apparatus for canopy straps according to claim 1, wherein: The reversing seat (6) is rotationally installed with a linkage roller (65) coaxially connected to a driving screw rod (431); the linkage member (7) comprises a first linkage rod (71), a second linkage rod (72), a first push ring (73) and a second push ring (74), the first linkage rod (71) and the second linkage rod (72) are both installed on the reversing seat (6) and parallel to the linkage roller (65), the first contact block (63) is slidably sleeved on the first linkage rod (71), and the second contact block (64) is slidably sleeved on the second linkage rod (72); the first push ring (73) is slidably sleeved on the first linkage rod (71) for pushing the first contact block (63) to slide, the second push ring (74) is slidably sleeved on the second linkage rod (72) for pushing the second contact block (64) to slide, and the first push ring (73) and the linkage roller (65) and the second push ring (74) and the linkage roller (65) are in meshing transmission; the first push ring (73) and the first linkage rod (71) and the second push ring (74) and the second linkage rod (72) are in threaded connection, and the screw rotation directions of the first push ring (73) and the first linkage rod (71) and the second push ring (74) and the second linkage rod (72) are oppositely arranged.

6. The automatic sewing apparatus for canopy straps according to claim 5, wherein: The first linkage rod (71) and the second linkage rod (72) are both rotationally installed on the reversing seat (6), one end of the first linkage rod (71) is coaxially connected with a first gear (75), one end of the second linkage rod (72) is coaxially connected with a second gear (76), and the first gear (75) and the second gear (76) are in meshing transmission; the first gear (75) is provided with a locking member for limiting the circumferential rotation of the first gear (75).

7. The automatic sewing apparatus for canopy straps according to claim 6, wherein: The surface of the first gear (75) is provided with a plurality of first connecting holes (751), all the first connecting holes (751) are arranged at intervals around the axial direction of the first gear (75), and the side wall of the reversing seat (6) close to the first gear (75) is provided with a second connecting hole (66); the locking member comprises a locking rod (77), the locking rod (77) is sequentially inserted into the first connecting hole (751) and the second connecting hole (66) and is in threaded connection with the second connecting hole (66).

Images