Zipper production process without tooth setting and zipper

Abstract

The application provides a zipper production process without tooth setting and a zipper. The process steps include feeding and sewing, cutting the zipper chain by a cutting device, reserving a belt head, and feeding again in four steps. The above steps are cycled through the cooperation of a chain feeding device, a cutting device and a chain collecting device, so that a fixed length of chain and a belt head are formed on the zipper code belt under the premise of uninterrupted production. The material cost of the zipper chain is saved. Meanwhile, the zipper produced by using the process is free of the later "tooth setting" process, the equipment investment is reduced, the production efficiency is improved, and the equipment operation cost and labor cost are reduced.

Description

Technical Field

[0001] This invention relates to the field of zipper technology, specifically a zipper manufacturing process and zipper that eliminates the need for tooth-based dimensional determination. Background Technology

[0002] Zippers are commonly used for opening and closing products, widely used in various bags, clothing, and shoes. In current technology, the generally accepted nylon zipper consists of two zipper tapes and two pre-formed, joined spiral chains with a center line, sewn together with thread. The sewing machine continuously sews this connection, continuing until a basket is full, as long as the spiral chain and zipper tape remain intact. This process is technically called "code tape." Code tape has two uses: one for making individual strips, and the other for creating rolls. Coded rolls are dyed and then numbered to a certain length.

[0003] Strip zippers are zippers made from code tape to the required length. During the production of strip zippers, there is a process called "tooth removal and sizing," which involves punching out a certain length of teeth from the pre-shaped code tape at a specific end to create space for installing the zipper head and other zipper accessories. This part is technically called the tape head. However, the code tape produced using this process has teeth removed at the tape head length during the tooth removal and sizing process, resulting in material loss and a relatively cumbersome process. Therefore, the applicant has been continuously exploring and hoping to design a new production process that pre-reserves the tape head during production, avoiding material loss caused by the later tooth removal and sizing process, and also improving production efficiency.

[0004] The purpose of this invention is to overcome the shortcomings and deficiencies of the existing technology and to provide a zipper production process and equipment that eliminates the need for tooth-fixed dimensional measurement. The technical solution adopted by this invention is as follows: A zipper manufacturing process that eliminates the need for toothed sizing includes the following steps: S1. Feeding and sewing: The zipper chain and zipper tape are fed to the operating table by the chain feeding device and the zipper tape feeding mechanism, respectively. The zipper chain and zipper tape are sewn together by the sewing device on the operating table. The sewn zipper tape is pulled by the chain take-up device. S2. Cutting device cuts the zipper chain: The cutting device includes a cutter and a synchronization controller. The synchronization controller controls the cutter to rush down after the sewing device has sewn a set number of stitches (after forming a certain zipper length) to cut the zipper chain. At the same time, the synchronization controller controls the chain feeding device to stop feeding. S3. Reserved lead: The synchronous controller controls the cutter to stop for a set number of stitches after it plunges down, and during this process, the zipper belt feeding mechanism keeps feeding, the chain take-up device keeps pulling, and the sewing thread keeps sewing the needle. S4. Feeding again: The synchronous controller controls the cutter to reset after stopping for a set number of needles. At the same time as the cutter resets, the chain feeding device resumes feeding, and the zipper chain is fed into the operating table again by the chain feeding device. The synchronous controller controls the cutting device and the sewing device to achieve multiple cycles from S1 to S4. During the S1 to S4 process, the zipper tape is kept moving by the chain take-up device and the zipper tape feeding mechanism, so as to produce zipper tape without tooth sizing without interruption.

[0005] The "set stitch count" is calculated based on the required lead length and stitch pitch, and can be set as needed by those skilled in the art. The above steps are further explained as follows: when the zipper reaches the set length, the cutter descends to cut the zipper chain and blocks it, leaving the lead portion unsewn. Under the traction of the chain-retracting device, the zipper tape continues to move and be sewn. When the lead reaches a certain length, the cutter rises, and the chain-feeding device re-feeds the zipper chain, repeating the next cycle. By controlling the downward and upward movement of the cutter, the chain length and lead length of each zipper can be controlled. The zipper chain length plus the lead length constitutes the total length of a zipper.

[0006] Furthermore, after several cycles of S1-S4, the zipper head is fitted onto the prepared zipper tape. Typically, a zipper chain consists of two spiral chains with a center line joined together (the use of a zipper involves separating or joining these two spiral chains using the zipper head). "Tooth removal and sizing" involves punching out a unit length of teeth from the pre-formed tape at a predetermined length to create processing space, but the center line of this spiral chain is not removed during the subsequent tooth removal and sizing process. However, the presence of this extra center line makes it difficult to install the zipper head later, or necessitates a larger fabric seam in the zipper head for installation. However, a larger fabric seam in the zipper head also makes the zipper prone to bursting when opened and closed. The zipper tape produced by this process has a pre-existing head portion without an extra center line, facilitating zipper head installation and allowing for a smaller fabric seam in the zipper head to ensure its performance.

[0007] Preferably, the cutter sets its down-and-reset cycle by setting the number of stitches, thereby coordinating with the traction speed of the chain take-up device to control the zipper length and lead length produced in each cycle.

[0008] Preferably, the chain take-up device has a certain circumference. The sewing device sews once up and down with the needle and thread. The synchronous controller controls the chain take-up device to rotate one chain tooth pitch of circumference (corresponding to a certain angle of rotation) to pull the zipper code tape to move a certain distance (usually one tooth pitch).

[0009] Preferably, the cutting device includes a cylinder, one end of the cutter is connected to a push rod on the cylinder, and the cylinder realizes the downward movement and reset of the cutter.

[0010] Preferably, the chain feeding device has a claw-tooth structure, and the tooth pitch of the claw-tooth structure is equal to the tooth pitch of the zipper chain; when the cutter strikes down, the chain feeding device separates from the zipper chain or the chain feeding device stops rotating, pausing chain feeding; when the cutter resets, the chain feeding device contacts and engages with the zipper chain to feed the zipper chain into the operating table.

[0011] Preferably, the operating table includes an upper pressure plate, a lower pressure plate, and a conveying groove. Two zipper belts are located between the upper and lower pressure plates and are respectively located on both sides of the zipper chain. The zipper chain is conveyed from the conveying groove to the space between the two zipper belts.

[0012] Preferably, the conveying groove and the cutter are provided with a groove or through hole at the corresponding position, so that the cutter extends into the groove or through hole when cutting the zipper chain, and cooperates with the edge of the groove or through hole to cut the zipper chain, so that the cutter can accurately and thoroughly cut the zipper chain without damaging the operating table itself.

[0013] Preferably, the chain feeding device and the zipper tape feeding mechanism work together so that when the zipper chain is below the cutting device, it is positioned between the two zipper tapes and its position does not overlap with the two zipper tapes, so that the cutter does not cut the zipper tape when it moves down.

[0014] Zippers manufactured using the above-described toothless dimensional zipper production process are still within the scope of protection of this invention.

[0015] The beneficial effects of the present invention are as follows: Firstly, this process reserves the lead on the zipper tape under the premise of uninterrupted production, saving the material cost of the zipper chain. At the same time, the zipper produced by this process eliminates the later "tooth removal and sizing" process, which can reduce equipment investment, improve production efficiency, and reduce equipment operating costs and labor costs. Secondly, when installing the zipper head later, because the zipper tape produced by this process has a pre-reserved head portion, there is no center line retained by the conventional "tooth removal and sizing". The inner sides of the two zipper tapes at the head portion are thinner, which facilitates the installation of the zipper head and allows the left and right openings of the zipper head to be smaller to ensure its performance. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, obtaining other drawings based on these drawings without creative effort still falls within the scope of the present invention.

[0017] Figure 1 A schematic diagram of the structure of an apparatus for implementing the process of the present invention; Figure 2 for Figure 1 Top view of the control panel of the central device; Figure 3 A schematic diagram of the structure of the zipper code tape prepared by this process; In the diagram, 1-cutter, 2-cutting device, 3-chain feeding device, 4-zipper chain, 5-zipper tape, 6-needle, 8-upper pressure plate, 9-lower pressure plate, 10-chain take-up device, 11-needle bar, 12-synchronization controller, 101-taper head, 104-through hole. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings.

[0019] The directional and positional terms used in this invention, such as "up," "down," "front," "back," "left," "right," "inner," "outer," "top," "bottom," and "side," are merely for reference to the accompanying drawings. Therefore, the directional and positional terms used are for illustrating and understanding this invention, and not for limiting the scope of protection of this invention.

[0020] Example 1 Reference Figure 1 A zipper manufacturing process that eliminates the need for toothed sizing includes the following steps: S1. Feeding and sewing: The zipper chain 4 and zipper tape 5 are fed to the operating table through the chain feeding device and the zipper tape feeding mechanism, respectively. The zipper chain and zipper tape are sewn together by the sewing device on the operating table. The sewn zipper tape is pulled by the chain take-up device 10. The sewing device includes a needle bar 11 and a needle 6. The needle bar 11 drives the needle to rise and fall. The specific sewing method is well known in the art and will not be described in detail here.

[0021] The cutting device cuts the zipper chain: The cutting device 2 includes a cutter 1 and a synchronization controller 12. The synchronization controller 12 controls the cutter 2 to plunge down after the sewing device sews a set number of stitches, cutting the zipper chain. At the same time, the synchronization controller 12 controls the chain feeding device to pause feeding. The cutting device 2 includes a cylinder. One end of the cutter 1 is connected to a push rod on the cylinder, and the cylinder realizes the plunging and resetting of the cutter 1. The "synchronization controller 12" can be a computer operating system or other automated implementation device. Those skilled in the art can set the number of pulses of the cutting device to set the cycle of the cutter plunging and resetting, thereby coordinating with the traction speed of the chain take-up device 10 to control the zipper length and belt length produced in each cycle.

[0022] Reserved lead: The synchronous controller 12 controls the cutter 1 to stay for a set time after it plunges down, and during this process, the zipper belt feeding mechanism keeps feeding, and the chain take-up device 10 keeps pulling; the chain take-up device 10 consists of two rotating wheels that cooperate with each other and have a certain circumference. For each stitch made by the sewing device, the synchronous controller 12 controls the chain take-up device 10 to rotate a circumference of one chain tooth pitch to pull the zipper belt to move.

[0023] Feeding again: Synchronous controller 12 controls the cutter 2 to reset after a set time. At the same time as the cutter 2 resets, the chain feeding device resumes feeding, and the zipper chain is fed into the operating table again by the chain feeding device. The synchronous controller 12 controls the cutting device and the sewing device to cooperate to achieve multiple cycles from S1 to S4. During the process from S1 to S4, the zipper tape is kept moving by the chain take-up device 10 and the zipper tape feeding mechanism to produce zipper tape without tooth sizing without interruption. The "set stitch count" is calculated based on the required lead length and zipper speed, and can be set as needed by those skilled in the art. The above steps are further explained as follows: when the zipper reaches the set length (stitch count multiplied by the zipper chain tooth pitch), the cutter 2 descends to cut the zipper chain and blocks it, leaving the lead portion unstitched. Under the traction of the chain-retracting device 10, when the lead reaches a certain length, the cutter 2 rises, and the chain-feeding device 3 re-feeds the zipper chain, repeating the next cycle. By controlling the cutting and lifting of the cutter 2, the chain length and lead length of each zipper can be controlled, where the zipper chain length plus the lead length constitutes the total length of the zipper.

[0024] Installing the zipper head: After several cycles of S1-S4, a continuous zipper tape is formed, consisting of a section with the zipper head and a section of the zipper chain spaced apart. From the prepared zipper tape (such as...) Figure 2 The zipper head is installed on the zipper head 101 (as shown), and the inner sides of the two zipper straps 5 extend into the fabric seam of the zipper head so that the zipper head and the zipper chain 4 can be matched.

[0025] The chain feeding device 3 has a claw-tooth structure, and the tooth pitch of the claw-tooth structure is equal to the tooth pitch of the zipper chain 4. When the cutter 1 moves down, the chain feeding device 3 separates from the zipper chain 4 or the chain feeding device 3 stops rotating and the chain feeding is paused. When the cutter 1 returns to its original position, the chain feeding device 3 contacts and engages with the zipper chain 4 to feed the zipper chain 4 into the operating table.

[0026] The operating table includes an upper pressure plate 8, a lower pressure plate 9, and a conveying groove. Two zipper belts are located between the upper pressure plate 8 and the lower pressure plate 9, and are respectively located on both sides of the zipper chain 4. The zipper chain 4 is conveyed from the conveying groove to the space between the two zipper belts.

[0027] The conveying groove is provided with a through hole 104 at the corresponding position of the cutter 2, so that the cutter 2 can extend into the through hole 104 when cutting the zipper chain, so that the cutter 2 can accurately and completely cut the zipper chain without damaging the operating table itself.

[0028] The chain feeding device and the zipper tape feeding mechanism work together to ensure that when the zipper chain is below the cutting device, it is positioned between the two zipper tapes and its position does not overlap with the two zipper tapes, so that the cutter 2 does not cut the zipper tape 5 when it moves down.

[0029] This process eliminates the need for the chain at the head section. The Ministry of Light Industry standard stipulates that the length of the head section should not be less than 38mm, reducing zipper material costs. Generally, the waste chain teeth punched off during tooth removal and sizing are discarded as industrial waste. Based on the average length of 140mm for the most common closed-end trouser zippers, this can reduce chain waste by 20%. At the same time, nylon zippers produced using this technology do not require tooth removal, eliminating the "tooth removal and sizing" process, reducing equipment investment, improving production efficiency, and reducing equipment operating costs and labor costs.

[0030] Furthermore, since the zipper chain 4 is composed of two spiral chains with a center line joined together (the use of a zipper involves separating or joining the two spiral chains through the zipper head), "tooth removal and sizing" involves punching out a unit length of teeth from the pre-shaped tape at the predetermined length end to leave room for processing. However, the center line of this spiral chain is not removed during the subsequent tooth removal and sizing process. When installing the zipper head later, the presence of this extra center line makes it difficult to install the zipper head, or requires a larger left and right fabric seam for installation. However, a larger fabric seam for the zipper head also makes it prone to bursting when the zipper chain is pulled. The zipper tape produced by this process has a pre-existing head portion without an extra center line, facilitating zipper head installation and allowing for a smaller left and right fabric seam for the zipper head to ensure its performance.

[0031] The above description discloses only preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. Therefore, equivalent variations made in accordance with the claims of the present invention are still within the scope of the present invention.

Claims

1. A zipper manufacturing process that eliminates the need for toothed sizing, characterized in that, Includes the following steps: S1. Feeding and sewing: The zipper chain (4) and zipper tape (5) are fed to the operating table by the chain feeding device (3) and the zipper tape feeding mechanism, respectively. The zipper chain (4) and zipper tape (5) are sewn together by the sewing device on the operating table. The sewn zipper tape is pulled by the chain take-up device (10). S2. Cutting device cuts zipper chain: The cutting device (2) includes a cutter (1) and a synchronization controller (12). The synchronization controller (12) controls the cutter (1) to rush down after the sewing device sews a set length or a set number of stitches to cut the zipper chain (4). At the same time, the synchronization controller (12) controls the chain feeding device (3) to stop feeding. S3. Reserved lead: The synchronous controller (12) controls the cutting knife (1) to punch down for a certain period of time, the zipper feeding mechanism keeps feeding, and the chain take-up device (10) keeps traction; S4. Feeding again: The synchronous controller (12) controls the cutter (1) to reset, the chain feeding device (3) resumes chain feeding, and the zipper chain (4) is fed into the operating table again by the chain feeding device (3) for sewing; The synchronous controller (12) controls the cutting device (2) to cooperate with the sewing device to achieve multiple cycles of S1-S4. During the S1-S4 process, the zipper belt is always moved by the chain take-up device (10) in cooperation with the zipper belt feeding mechanism, so as to continuously produce zipper belts with fixed chain length and fixed belt head length without removing teeth.

2. The zipper manufacturing process that eliminates the need for toothed sizing according to claim 1, characterized in that: The cutter (1) sets its down-and-reset cycle by setting the number of pulses, thereby coordinating with the traction speed of the chain take-up device to control the zipper length and belt length produced in each cycle.

3. The zipper manufacturing process that eliminates the need for toothed dimensional fixing according to claim 1, characterized in that: The chain take-up device (10) has a certain circumference. For each stitch made by the sewing device, the synchronous controller (12) controls the chain take-up device (10) to rotate by a circumference of one chain tooth pitch to pull the zipper tape to move.

4. The zipper manufacturing process that eliminates the need for toothed sizing according to claim 2, characterized in that: The cutting device (2) includes a cylinder. One end of the cutter (1) is connected to the push rod on the cylinder, and the cylinder realizes the downward movement and reset of the cutter (1).

5. The zipper manufacturing process that eliminates the need for toothed sizing according to claim 1, characterized in that: The chain feeding device (3) has a claw-tooth structure, and the tooth pitch of the claw-tooth structure is equal to the tooth pitch of the zipper chain (4); When the cutter (1) plunges down, the chain feeding device (3) separates from the zipper chain (4) or the chain feeding device (3) stops operating and the chain feeding is paused; when the cutter (1) resets, the chain feeding device (3) contacts and cooperates with the zipper chain (4) to feed the zipper chain (4) into the operating table.

6. The zipper manufacturing process that eliminates the need for toothed dimensional fixing according to claim 1, characterized in that: The operating table includes an upper pressure plate (8), a lower pressure plate (9) and a conveying groove. Two zipper belts are located between the upper pressure plate (8) and the lower pressure plate (9) and are respectively located on both sides of the zipper chain (4). The zipper chain (4) is conveyed from the conveying groove to the two zipper belts.

7. The zipper manufacturing process that eliminates the need for toothed dimensional fixing according to claim 6, characterized in that: The conveying groove and the cutter (1) are provided with grooves or through holes at corresponding positions, so that the cutter can extend into the grooves or through holes when cutting the zipper chain, and cooperate with the edge of the grooves or through holes to cut the zipper chain.

8. A zipper manufacturing process that eliminates the need for toothed dimensional fixing according to claim 6, characterized in that: The chain feeding device (3) and the zipper tape feeding mechanism work together to ensure that the zipper chain (4) is located between the two zipper tapes when it is below the cutting device and its position does not coincide with the two zipper tapes, so that the cutter does not cut the zipper tape (5) when it is downward.

9. The zipper manufacturing process that eliminates the need for toothed dimensional fixing according to claim 1, characterized in that: After several cycles of S1-S4, the zipper head is installed from the head (101) of the prepared zipper tape. The inner sides of the two zipper tapes (5) extend into the openings on both sides of the zipper head so that the zipper head can cooperate with the zipper chain (4).

10. A zipper, characterized in that: It is prepared using the toothless dimensional zipper manufacturing process as described in any one of claims 1-9.

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