Double-pulling-piece puller feeding device

Abstract

The utility model discloses a double-pulling-piece puller feeding device which comprises double-pulling-piece pullers and a feeding mechanism, the feeding mechanism comprises a material guiding plate and a material stopping and discharging mechanism, the material guiding plate is provided with a material guiding clamping groove, bodies of a plurality of double-pulling-piece pullers are movably connected with the material guiding clamping groove in a clamped mode, and the double-pulling-piece pullers are arranged in the material guiding clamping groove. The double-pull-piece puller comprises a material guiding clamping groove, two pull pieces of the double-pull-piece puller are oppositely arranged on the front side and the rear side of the material guiding clamping groove, a material pushing mechanism is arranged at the discharging end of the material guiding clamping groove, pull piece bearing mechanisms are oppositely arranged on the front side and the rear side below the discharging end, a material receiving mechanism is arranged below the pull piece bearing mechanisms, and a pull piece fixing mechanism is arranged between the material receiving mechanism and the material pushing mechanism. And the feeding mechanism is connected with the material receiving mechanism. According to the utility model, when the double-pull-tab puller is pushed into the material receiving mechanism from the feeding mechanism, the pull tab on the upper side is fixed through the pull tab fixing mechanism, so that the pull tab on the upper side is prevented from moving randomly during puller threading, the puller threading quality and efficiency are ensured, and the stable and reliable operation of equipment is ensured.

Description

Technical Field

[0001] This utility model relates to the field of zipper manufacturing technology, and in particular to a double-tack zipper feeder device. Background Technology

[0002] The double-pull tab zipper has pull tabs on both the front and rear sides. If the existing zipper feeding device is used for feeding, the pull tab located on the upper side of the zipper will fall down when the zipper is threaded through. It will move uncontrollably due to the vibration generated by the high-speed insertion of the zipper belt. During the random movement, it will repeatedly hit and impact the zipper belt or zipper belt, which can easily scratch and damage the zipper belt, zipper, or pull tab. It can also easily cause abnormalities in threading the zipper.

[0003] Therefore, it is necessary to develop a double-pull-plate feeder device that allows the double-pull-plate feeder to be pushed from the feeding mechanism into the receiving mechanism while the upper pull plate is fixed by the pull plate fixing mechanism. This prevents the upper pull plate from moving randomly when the puller is threaded through, ensuring the quality and efficiency of the puller threading and guaranteeing the stable and reliable operation of the equipment. Utility Model Content

[0004] To solve the above problems, the technical solution adopted by this utility model is as follows:

[0005] A double-pull-tab feeding device includes a double-pull-tab pull head and a feeding mechanism. The feeding mechanism includes a guide plate and a material stopping and releasing mechanism. The guide plate is provided with a guide groove extending from top to bottom. The bodies of multiple double-pull-tab pull heads are movably engaged with the guide groove, and the two pull tabs of the double-pull-tab pull heads are arranged opposite each other on the front and rear sides of the guide groove. The material stopping and releasing mechanism is used to control the double-pull-tab pull heads to fall into the discharge end of the guide groove one by one.

[0006] The discharge end of the guide slot is provided with a pushing mechanism, and the front and rear sides below the discharge end are provided with a pull tab support mechanism, and a receiving mechanism is provided below the pull tab support mechanism. A pull tab fixing mechanism is provided between the receiving mechanism and the pushing mechanism.

[0007] The pushing mechanism is used to push the double pull tabs into the receiving mechanism, the pull tab supporting mechanism is used to support the two pull tabs to a horizontal state before the double pull tabs are pushed into the receiving mechanism, and the pull tab fixing mechanism is used to fix one or both pull tabs of the double pull tabs onto the receiving mechanism.

[0008] It also includes a feeding mechanism connected to the receiving mechanism, which is used to drive the receiving mechanism to move to the threading head station.

[0009] Preferably, the receiving mechanism includes a receiving seat and a tilting cylinder connected to the receiving seat. The receiving seat has a pull head slot in the middle, and pull tab support grooves are provided on both sides of the pull head slot. A pull tab fixing mechanism is provided at the end of the pull tab support groove away from the tilting cylinder. The cylinder body of the tilting cylinder is connected to the feeding mechanism.

[0010] Preferably, the pull tab fixing mechanism includes a pull tab fixing hook and a support rod connected to the pushing mechanism. The middle part of the pull tab fixing hook is rotatably connected to the receiving seat through a pin. The hook part of the pull tab fixing hook is located on the pull tab support groove, and the other end is connected to the receiving seat through a first tension spring. The support rod is located above the pull tab fixing hook. The support rod is used to push the hook part of the fixing hook away from the pull tab support groove when the pushing mechanism moves down.

[0011] Preferably, the pushing mechanism includes a pushing claw, a connecting plate, and a pushing cylinder;

[0012] The pusher cylinder is connected to the guide plate, and the drive end is connected to the pusher claw through the connecting plate. The pusher claw is located in front of the guide slot. A connecting groove is provided at the connection point between the connecting plate and the pusher claw. A limit block is provided at the opening of the connecting groove. The middle part of the pusher claw is rotatably connected to the connecting groove through a pin. An elastic element is provided in the movable gap between the surface of the pusher claw close to the guide slot and the surface of the other end away from the limit block and the connecting groove.

[0013] Preferably, the material stopping and releasing mechanism includes a material stopping block and a material releasing block arranged sequentially from top to bottom on one side of the material guide slot, and a material stopping cylinder and a material releasing cylinder respectively connected to the material stopping block and the material releasing block, wherein the material stopping cylinder and the material releasing cylinder are connected to the material guide plate.

[0014] Preferably, the pull-out station is provided with an upper pull-out mold, a lower pull-out mold, and a second tension spring;

[0015] A slide rail pair and a tensioning cylinder are sequentially arranged above the upper die of the zipper puller. The drive end of the tensioning cylinder is connected to the upper end of the slider of the slide rail pair, and the upper die of the zipper puller is connected to the lower end of the slider of the slide rail pair. The tensioning cylinder is used to restrict the descent of the upper die of the zipper puller during operation.

[0016] A mold up-and-down driving mechanism is provided below the lower mold of the pull head, and a pull head feeding mechanism is provided on one side of the lower mold of the pull head. The pull head feeding mechanism is used to push the double pull tab pull head of the receiving mechanism into the pull head mold. The mold up-and-down driving mechanism is used to drive the lower mold of the pull head to move closer to or away from the upper mold of the pull head.

[0017] The two ends of the second tension spring are connected to the upper die and the lower die of the slider respectively. The second tension spring is used to make the upper die and the lower die of the slider fit together when there is no external force.

[0018] Preferably, the pull tab support mechanism includes a pull tab support block and a pull tab drag block cylinder whose drive end is connected to the pull tab support block.

[0019] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0020] 1. This utility model enables the double pull tab to be pushed from the feeding mechanism into the receiving mechanism, while the upper pull tab is fixed by the pull tab fixing mechanism, so as to prevent the upper pull tab from moving randomly when the pull tab is threaded, thus ensuring the quality and efficiency of the pull tab threading and guaranteeing the stable and reliable operation of the equipment.

[0021] 2. By installing a second tension spring between the upper and lower zipper dies, the upper and lower zipper dies are kept in close contact, preventing the double-pull zipper head from detaching from the die when the die moves upward through the zipper head station. At the same time, by installing a tension cylinder on the upper zipper die, the upper zipper die is prevented from moving downward with the lower zipper head under the action of the second tension spring before the zipper is produced, thus ensuring the normal operation of the equipment. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the material receiving mechanism in the unextended state in this utility model;

[0023] Figure 2 This is a structural schematic diagram of the material receiving mechanism in the extended state in this utility model;

[0024] Figure 3 for Figure 1 A rear-view stereoscopic structural diagram;

[0025] Figure 4 for Figure 3 Enlarged view of a portion of point A in the middle;

[0026] Figure 5 for Figure 1 One of the exploded schematic diagrams of the pusher mechanism and the receiving mechanism;

[0027] Figure 6 for Figure 1 Exploded view diagram of the central pushing mechanism and receiving mechanism (Part 2);

[0028] The components include: feeding mechanism 1, pushing mechanism 2, pull tab support mechanism 3, receiving mechanism 4, pull tab fixing mechanism 5, feeding mechanism 6, pull tab upper die 7, pull tab lower die 8, second tension spring 9, guide plate 11, material stopping and releasing mechanism 12, pushing claw 21, connecting plate 22, pushing cylinder 23, pull tab support block 31, pull tab drag block cylinder 32, receiving seat 41, flipping cylinder 42, pull tab fixing hook 51, support rod 52, first tension spring 53, double pull tab pull head 10, limiting block 20, elastic element 30, slide rail pair 40, tensioning cylinder 50, mold up and down driving mechanism 60, pull tab feeding mechanism 70, material stopping block 121, material releasing block 122, material stopping cylinder 123, material releasing cylinder 124, guide slot 11a, connecting slot 22a, pull head slot 41a, and pull tab support groove 41b. Detailed Implementation

[0029] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of this utility model are shown in the drawings. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0030] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," "up," "down," "front," "back," and similar expressions used in this document are for illustrative purposes only.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0032] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments:

[0033] like Figure 1-6As shown, a double-pull-tab feeding device includes a double-pull-tab pull head 10 and a feeding mechanism 1. The feeding mechanism 1 includes a guide plate 11 and a material stopping and releasing mechanism 12. The guide plate 11 is provided with a guide groove 11a extending from top to bottom. The bodies of multiple double-pull-tab pull heads 10 are movably engaged with the guide groove 11a, and the two pull tabs of the double-pull-tab pull head 10 are arranged opposite to each other on the front and rear sides of the guide groove 11a. The material stopping and releasing mechanism 12 is used to control the double-pull-tab pull heads 10 to fall into the discharge end of the guide groove 11a one by one.

[0034] The discharge end of the guide slot 11a is provided with a pushing mechanism 2, and a pull tab support mechanism 3 is provided opposite to the front and rear sides below the discharge end. A receiving mechanism 4 is provided below the pull tab support mechanism 3, and a pull tab fixing mechanism 5 is provided between the receiving mechanism 4 and the pushing mechanism 2.

[0035] The pushing mechanism 2 is used to push the double pull tab 10 into the receiving mechanism 4. The pull tab supporting mechanism 3 is used to support the two pull tabs to a horizontal state before the double pull tab 10 is pushed into the receiving mechanism 4. The pull tab fixing mechanism 5 is used to fix one or two pull tabs of the double pull tab 10 onto the receiving mechanism 4.

[0036] It also includes a feeding mechanism 6 connected to the receiving mechanism 4, the feeding mechanism 6 being used to drive the receiving mechanism 4 to move to the threading head station.

[0037] Working principle: Multiple double-pull tab pull heads 10 are inserted into the guide slot 11a of the feeding mechanism 1;

[0038] Step 1 (feeding): Under the control of the material stopping and feeding mechanism 12, the double pull head 10 located at the bottom of the guide groove 11a is made to fall into the discharge end of the guide groove 11a. At this time, the two pulls are in a state parallel to the guide plate 11.

[0039] Step 2 (to bring the pull sheet to a horizontal position): Then the pushing mechanism 2 clamps the double pull sheet pull head 10, and then the pull sheet support mechanism 3 supports the pull sheet to a horizontal position, so that the pull sheet forms the best material receiving state; at the same time, the material stopping and releasing mechanism 12 repeats the action of Step 1.

[0040] Step 3 (Pushing Material): Then the pushing mechanism 2 moves down and pushes the double pull tab 10 onto the receiving mechanism 4. The pull tab remains horizontal. At the same time, the pull tab fixing mechanism 5 moves to fix one or both pull tabs of the double pull tab 10 onto the receiving mechanism 4. After completion, the pushing mechanism 2 and the pull tab support mechanism 3 are reset. Then the pull tab support mechanism 3 repeats the action of step 2.

[0041] Step 4 (pushing the pull head to the pull head insertion station): After the pull head is fed into the receiving mechanism 4, the feeding mechanism 6 is driven to push the receiving mechanism 4 forward to the pull head insertion station. Before reaching the pull head insertion station, in order to meet the requirements of the pull head insertion, the receiving mechanism 4 needs to be rotated at a set angle. After the pull head insertion is completed, the feeding mechanism 6 is reset, and the pushing mechanism 2 and the pull tab fixing mechanism 5 repeat the actions of step 3.

[0042] Then, by repeating the above steps, the feeding, pulling to a horizontal position, pushing, receiving and feeding of the double pull tab 10 before it is sent into the pull tab insertion station can be completed automatically. When receiving the material, the pull tab is made to form the optimal receiving state, thereby avoiding the pull tab on the upper side moving randomly when inserting the pull tab, ensuring the quality and efficiency of the pull tab insertion, and ensuring the stable and reliable operation of the equipment.

[0043] Furthermore, such as Figure 1 , 2 As shown in Figures 3, 5, and 6, the receiving mechanism 4 includes a receiving seat 41 and a tilting cylinder 42 connected to the receiving seat 41. The receiving seat 41 has a pull head slot 41a in the middle, and pull tab support grooves 41b are provided on both sides of the pull head slot 41a. A pull tab fixing mechanism 5 is provided at the end of the pull tab support groove 41b away from the tilting cylinder 42. The cylinder body of the tilting cylinder 42 is connected to the feeding mechanism 6.

[0044] In this embodiment, after the pull tabs of the double pull tab pull head 10 form the optimal material receiving state, the pushing mechanism 2 pushes the double pull tab pull head 10 into the pull head slot 41a, and the two pull tabs are placed in the pull tab support groove 41b. Then, the pull tab fixing mechanism 5 fixes the pull tabs in the pull tab support groove 41b, thereby fixing the pull tabs while completing the material receiving, effectively preventing the pull tabs from moving randomly when flipping; the feeding mechanism 6 includes a feeding cylinder.

[0045] Furthermore, such as Figure 5 , 6 As shown, the pull tab fixing mechanism 5 includes a pull tab fixing hook 51 and a support rod 52 connected to the pushing mechanism 2. The middle part of the pull tab fixing hook 51 is rotatably connected to the receiving seat 41 through a pin. The hook part of the pull tab fixing hook 51 is located on the pull tab supporting groove 41b, and the other end is connected to the receiving seat 41 through a first tension spring 53. The support rod 52 is located above the pull tab fixing hook 51. The support rod 52 is used to push the hook part of the fixing hook away from the pull tab supporting groove 41b when the pushing mechanism 2 moves down.

[0046] In this embodiment, when the double pull tab pull head 10 is not in the receiving mechanism 4, the hook part of the pull tab fixing hook 51 is located on the pull tab support groove 41b. When the pushing mechanism 2 pushes the double pull tab pull head 10 into the pull head slot 41a, the support rod 52 first moves down to push the hook part of the fixing hook away from the pull tab support slot. Then the double pull tab pull head 10 enters the pull head slot 41a, and the two pull tabs are separated from the pull tab support mechanism 3 and fall into the pull tab support groove 41b. Then the pushing mechanism 2 resets and moves the push rod up. When the push rod is separated from the pull tab fixing hook 51, the pull tab fixing hook 51 rotates and resets under the action of the first tension spring 53, hooking the pull tab located on the pull tab support groove 41b, thereby achieving the fixing of the pull tab while receiving the material.

[0047] Furthermore, such as Figure 5 , 6 As shown, the pushing mechanism 2 includes a pushing claw 21, a connecting plate 22, and a pushing cylinder 23. The pushing cylinder 23 is connected to the guide plate 11, and its driving end is connected to the pushing claw 21 through the connecting plate 22. The pushing claw 21 is located on the front side of the guide slot 11a. A connecting groove 22a is provided on the connecting plate 22 at the connection point with the pushing claw 21. A limit block 20 is provided at the opening of the connecting groove 22a. The middle part of the pushing claw 21 is rotatably connected to the connecting groove 22a through a pin. An elastic element 30 is provided in the movable gap between the surface of the pushing claw 21 near the guide slot 11a and the surface of the other end away from the limit block 20 and the connecting groove 22a. The elastic element 30 is a spring.

[0048] In this embodiment, when the pushing mechanism 2 is working, it first drives the pushing claw 21 to move upward. The claw tip of the pushing claw 21 touches the double pull tab pull head 10 and rotates downward until it moves above the double pull tab pull head 10. Then it drives the pushing claw 21 to move downward. The downward-moving pushing claw 21 is restricted by the limiting block 20 and cannot rotate upward, thereby pushing the double pull tab pull head 10 into the pull head slot 41a of the receiving mechanism 4, thereby realizing the automatic pushing of the pull heads one by one to the receiving mechanism 4.

[0049] Furthermore, such as Figure 3 , 4 As shown, the material stopping and releasing mechanism 12 includes a material stopping block 121 and a material releasing block 122 arranged sequentially from top to bottom on one side of the material guide slot 11a, and a material stopping cylinder 123 and a material releasing cylinder 124 respectively connected to the material stopping block 121 and the material releasing block 122. The material stopping cylinder 123 and the material releasing cylinder 124 are connected to the material guide plate 11.

[0050] In this embodiment, when a lower double-pull tab pull head 10 is needed, the feeding cylinder 124 is activated, driving the feeding block 122 away from the guide slot 11a. Then, the double-pull tab pull head 10 falls above the pusher claw 21 without the obstruction of the feeding block 122. Then, the feeding cylinder 124 resets, and the stopping cylinder 123 is activated, causing the stopping block 121 to move away from the guide slot 11a. Then, the next double-pull tab pull head 10 falls above the feeding block 122. Then, the stopping cylinder 123 resets, blocking other double-pull tab pull heads 10 to prevent all pull heads from being released during feeding, thereby realizing the automatic feeding of the double-pull tab pull heads 10.

[0051] Furthermore, such as Figure 1 , 2 As shown in Figure 3, the pull head insertion station is equipped with an upper pull head mold 7, a lower pull head mold 8, and a second tension spring 9.

[0052] Above the upper slider 7, a slide rail pair 40 and a tensioning cylinder 50 are arranged in sequence. The driving end of the tensioning cylinder 50 is connected to the upper end of the slider of the slide rail pair 40, and the upper slider 7 is connected to the lower end of the slider of the slide rail pair 40. The tensioning cylinder 50 is used to restrict the descent of the upper slider 7 when it is in motion.

[0053] A mold up-and-down driving mechanism 60 is provided below the lower mold of the pull head 8, and a pull head feeding mechanism 70 is provided on one side of the lower mold of the pull head 8. The pull head feeding mechanism 70 is used to push the double pull tab pull head 10 of the receiving mechanism 4 into the pull head mold. The mold up-and-down driving mechanism 60 is used to drive the lower mold of the pull head 8 to move closer to or away from the upper mold of the pull head 7.

[0054] The two ends of the second tension spring 9 are connected to the upper mold 7 and the lower mold 8 of the slider, respectively. The second tension spring 9 is used to make the upper mold 7 and the lower mold 8 of the slider fit together when there is no external force.

[0055] In this embodiment, initially, the upper zipper die 7 and the lower zipper die 8 are attached to each other under the action of the second tension spring 9. The zipper feeding mechanism 70 pushes the double-pull tab zipper 10 located on the receiving mechanism 4 to the zipper die. Then the receiving mechanism 4 is reset, and the die up and down driving mechanism 60 is activated, pushing the lower zipper die 8 and the upper zipper die 7 upward to move. After reaching the set position, the zipper head is threaded. After the zipper head is threaded, since the zipper tape has not been cut, if the upper zipper die 7 moves down with the lower zipper die 8, it will pull the zipper tape and affect the normal operation of the equipment. Therefore, the upper zipper die 7 cannot move down with the lower zipper die 8 at this time. So at this time, the tension cylinder 50 is activated to inflate and pull the upper zipper die 7, restricting the upper zipper die 7 from moving down with the lower zipper die 8 under the action of the second tension spring 9. When the zipper production is completed, the tension cylinder 50 is de-energized. At this time, the upper zipper die 7 descends to the original position along the slide rail pair 40 under the action of the second tension spring 9.

[0056] The above structure, by setting a second tension spring 9 between the upper zipper die 7 and the lower zipper die 8, ensures that the upper zipper die 7 and the lower zipper die 8 are in close contact, preventing the double-pull tab zipper head 10 from detaching from the die when the die moves upward to the zipper head station; at the same time, by setting a tension cylinder 50 on the upper zipper die 7, it prevents the upper zipper die 7 from moving downward with the lower zipper die 8 under the action of the second tension spring 9 before the zipper production is completed, ensuring the normal operation of the equipment.

[0057] For those skilled in the art, various other corresponding changes and modifications can be made based on the technical solutions and concepts described above, and all such changes and modifications should fall within the protection scope of the claims of this utility model patent.

Claims

1. A double-pull-tab feeding device, comprising a double-pull-tab pull head and a feeding mechanism, characterized in that, The feeding mechanism includes a guide plate and a material stopping and releasing mechanism. The guide plate is provided with a guide groove extending from top to bottom. The bodies of multiple double-pull tab pull heads are movably engaged with the guide groove, and the two pull tabs of the double-pull tab pull heads are arranged opposite to each other on the front and rear sides of the guide groove. The material stopping and releasing mechanism is used to control the double-pull tab pull heads to fall into the discharge end of the guide groove one by one. The discharge end of the guide slot is provided with a pushing mechanism, and the front and rear sides below the discharge end are provided with a pull tab support mechanism, and a receiving mechanism is provided below the pull tab support mechanism. A pull tab fixing mechanism is provided between the receiving mechanism and the pushing mechanism. The pushing mechanism is used to push the double pull tabs into the receiving mechanism, the pull tab supporting mechanism is used to support the two pull tabs to a horizontal state before the double pull tabs are pushed into the receiving mechanism, and the pull tab fixing mechanism is used to fix one or both pull tabs of the double pull tabs onto the receiving mechanism. It also includes a feeding mechanism connected to the receiving mechanism, which is used to drive the receiving mechanism to move to the threading head station.

2. The double-pull-plate feeder according to claim 1, characterized in that, The receiving mechanism includes a receiving seat and a tilting cylinder connected to the receiving seat. The receiving seat has a pull head slot in the middle, and pull tab support grooves are provided on both sides of the pull head slot. A pull tab fixing mechanism is provided at the end of the pull tab support groove away from the tilting cylinder. The cylinder body of the tilting cylinder is connected to the feeding mechanism.

3. The double-pull-sheet feeder according to claim 2, characterized in that, The pull tab fixing mechanism includes a pull tab fixing hook and a support rod connected to the pushing mechanism. The middle part of the pull tab fixing hook is rotatably connected to the receiving seat through a pin. The hook part of the pull tab fixing hook is located on the pull tab support groove, and the other end is connected to the receiving seat through a first tension spring. The support rod is located above the pull tab fixing hook. The support rod is used to push the hook part of the fixing hook away from the pull tab support groove when the pushing mechanism moves down.

4. The double-pull-plate feeder according to claim 3, characterized in that, The pushing mechanism includes a pushing claw, a connecting plate, and a pushing cylinder; The pusher cylinder is connected to the guide plate, and the drive end is connected to the pusher claw through the connecting plate. The pusher claw is located in front of the guide slot. A connecting groove is provided at the connection point between the connecting plate and the pusher claw. A limit block is provided at the opening of the connecting groove. The middle part of the pusher claw is rotatably connected to the connecting groove through a pin. An elastic element is provided in the movable gap between the surface of the pusher claw close to the guide slot and the surface of the other end away from the limit block and the connecting groove.

5. The double-pull-sheet feeder according to claim 1, characterized in that, The material stopping and releasing mechanism includes a material stopping block and a material releasing block arranged sequentially from top to bottom on one side of the material guide slot, and a material stopping cylinder and a material releasing cylinder respectively connected to the material stopping block and the material releasing block. The material stopping cylinder and the material releasing cylinder are connected to the material guide plate.

6. The double-pull-sheet feeder according to claim 1, characterized in that, The pull-out station is equipped with an upper pull-out mold, a lower pull-out mold, and a second tension spring. A slide rail pair and a tensioning cylinder are sequentially arranged above the upper die of the zipper puller. The drive end of the tensioning cylinder is connected to the upper end of the slider of the slide rail pair, and the upper die of the zipper puller is connected to the lower end of the slider of the slide rail pair. The tensioning cylinder is used to restrict the descent of the upper die of the zipper puller during operation. A mold up-and-down driving mechanism is provided below the lower mold of the pull head, and a pull head feeding mechanism is provided on one side of the lower mold of the pull head. The pull head feeding mechanism is used to push the double pull tab pull head of the receiving mechanism into the pull head mold. The mold up-and-down driving mechanism is used to drive the lower mold of the pull head to move closer to or away from the upper mold of the pull head. The two ends of the second tension spring are connected to the upper die and the lower die of the slider respectively. The second tension spring is used to make the upper die and the lower die of the slider fit together when there is no external force.

7. The double-pull-sheet feeder according to claim 1, characterized in that, The pull tab support mechanism includes a pull tab support block and a pull tab drag block cylinder whose drive end is connected to the pull tab support block.

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