A hook-and-drive mechanism for a sewing machine

Abstract

This invention relates to a hook-and-drive mechanism for a sewing machine, comprising a support platform and a work plate fixed on top thereon. A limiting mechanism to prevent fabric deviation is provided on one side of the top of the work plate, and a straightening mechanism to prevent fabric wrinkles is provided on the other side of the top of the work plate. Several rubber strips are in close contact with the unsewn fabric. When the conveying fixture transports the fabric, the rubber strips provide friction to the unsewn fabric, keeping it taut during transport and preventing wrinkles. This avoids uneven sewing and improves the quality of the fabric. Two baffles guide the sewn fabric into a guide groove, preventing the end of the guide groove from scraping the sewn fabric. The guide groove guides and limits the sewn fabric, reducing the probability of deviation.

Description

Technical Field

[0001] This invention relates to the field of sewing machine technology, specifically to a hook-and-drive mechanism for a sewing machine. Background Technology

[0002] A sewing machine uses one or more sewing threads to form one or more stitches on fabric, allowing one or more layers of fabric to interweave or sew together. A sewing machine consists of four parts: the machine head, the machine base, the transmission system, and accessories. The machine head is the main part of the sewing machine, consisting of four mechanisms: needle insertion, thread hooking, thread take-up, and feed, as well as auxiliary mechanisms such as thread winding, pressing, and feed dog. The movements of these mechanisms are coordinated and work in a cyclical manner to sew the fabric together. Traditional sewing machines have complex needle insertion and thread hooking devices, which are costly, cumbersome in transmission, and difficult to maintain. For widely used sewing machines, maintenance costs would be very high, necessitating a solution to address these technical problems.

[0003] As shown in the patent document with publication number CN102251356B, the needle-punching part and the hook-thread part of the device are driven indirectly and directly by a power shaft driven by a drive source, respectively, to achieve synchronization between the two. The structure is simple and the transmission is fast, meeting the requirements of modern production equipment that is inexpensive, easy to maintain and repair, and is suitable for promotion and use in the sewing machine field.

[0004] However, in the aforementioned device, the existing method of conveying fabric during sewing involves using a conveyor to transport the fabric. Due to the friction between the work plate and the fabric, the fabric is prone to shifting during sewing, affecting sewing efficiency. Secondly, during the fabric transport process using the conveyor, the conveyor can easily wrinkle the unsewn fabric, leading to uneven sewing and affecting product quality. Finally, because the stitching and hooking devices pause during sewing while the winding device rotates continuously, the winding device can easily tear the fabric. Summary of the Invention

[0005] The technical problem solved by this solution is:

[0006] (1) How to set up a straightening mechanism so that several rubber strips are in close contact with the unsewn fabric, and when the conveying fixture conveys the fabric, several rubber strips provide friction to the unsewn fabric, so that the unsewn fabric is in a taut state during the conveying process, preventing wrinkles from appearing during the conveying process, avoiding uneven sewing of the fabric, and improving the product quality of the fabric.

[0007] (2) How to set a limiting mechanism to guide the sewn fabric into the guide groove through two baffles, so as to avoid the end of the guide groove from scratching the sewn fabric. By guiding and limiting the sewn fabric through the guide groove, the probability of it deviating is reduced.

[0008] (3) By setting up a buffer unit, since the needle-punching tool and the hook-thread tool will pause during the sewing process, the lifting seat moves downward under the limiting action of the guide sleeve, squeezing the second thrust spring, which not only rolls up the sewn fabric in a taut state, but also prevents it from being torn.

[0009] The objective of this invention can be achieved through the following technical solution: a hook transmission mechanism for a sewing machine, comprising a support platform and a work plate fixed on its top, wherein a limiting mechanism for preventing fabric deviation is provided on one side of the top of the work plate, and a straightening mechanism for preventing fabric wrinkles is provided on the other side of the top of the work plate.

[0010] The straightening mechanism includes a mounting groove on a work plate. A flip cover is hinged to one side of the mounting groove. First mounting plates are fixedly installed on the top of the inner wall of the flip cover and inside the mounting groove. Several rubber strips are provided on the fabric-facing side of each of the two first mounting plates, and these rubber strips are in contact with the fabric. A drive unit for rotating the flip cover is movably installed on the work plate on one side of the flip cover. When the cylinder is in its shortest position, the flip cover is open, and the unsewn fabric is neatly placed on the work plate, positioned above the mounting groove. The fabric extends through the cylinder's extension end, cooperating with the limiting plate and the second... The thrust spring causes the lever to slide a short distance within the groove, which, in conjunction with the second mounting plate, drives the flip cover to cover the unsewn fabric. The extended end of the cylinder continues to extend, causing the second thrust spring to contract. Through the thrust of the second thrust spring, the bottom of the flip cover comes into close contact with the working plate, ensuring that several rubber strips are in close contact with the unsewn fabric. When the conveying fixture transports the fabric, the rubber strips provide friction to the unsewn fabric, keeping it taut during transport. This prevents wrinkles from forming during transport, avoids uneven sewing, and improves the quality of the fabric.

[0011] A further technical improvement of the present invention is that: the driving unit includes a fixed plate fixedly connected to the working plate, a cylinder is hinged to the fixed plate, a push-pull plate is fixedly installed at the output end of the cylinder, a locking rod is fixedly installed on the side of the push-pull plate away from the cylinder, and two second mounting plates are symmetrically arranged on the top of the flip cover. Each of the two second mounting plates is provided with a sliding groove, and a lever is movably arranged in each of the two sliding grooves. Both levers are fixedly connected to the locking rod.

[0012] A further technical improvement of the present invention is that: a limiting plate is slidably provided inside the slide groove, the side of the limiting plate contacts the corresponding lever, and the side of the limiting plate away from the lever is elastically connected to the inner wall of the slide groove through a first thrust spring; when the output end of the cylinder extends to its longest state, the locking lever engages with the locking groove to prevent the flip cover from flipping. At this time, the second thrust spring retracts to its shortest state, preventing several rubber strips from separating from the unsewn fabric during the movement of the unsewn fabric, thereby ensuring the taut state of the unsewn fabric.

[0013] A further technical improvement of the present invention is that a card seat is fixedly provided on the side of the flip cover away from the fixed plate, and the card seat is provided with a card groove for engaging with the end of the card rod.

[0014] A further technical improvement of the present invention is that: the limiting mechanism includes a bracket fixedly connected to the working plate, the bracket is inclinedly provided with a guide groove for guiding the fabric, a buffer unit for preventing fabric damage is provided on one side of the guide groove, and a winding fixture for winding the fabric is fixedly installed on the support platform, the winding fixture being prior art.

[0015] A further technical improvement of the present invention is as follows: the buffer unit includes a guide sleeve fixedly connected to the work plate, a lifting seat is slidably arranged on the inner wall of the guide sleeve, a transmission roller is rotatably arranged on the top of the lifting seat, a guide rod is vertically arranged on the bottom of the inner wall of the guide sleeve, the top end of the guide rod is movably inserted into the bottom of the lifting seat, and a second thrust spring is elastically arranged between the bottom of the inner wall of the guide sleeve and the bottom of the lifting seat; the sewn fabric is guided into the guide groove by two baffles to avoid the end of the guide groove from scratching the sewn fabric, and the sewn fabric is guided and limited by the guide groove to reduce the probability of deviation; when the sewn fabric is rolled up by the winding fixture, the lifting seat moves downward under the limiting action of the guide sleeve due to the pause of the stitching fixture and the hooking fixture during the sewing process, squeezing the second thrust spring, which not only rolls up the sewn fabric in a taut state, but also prevents it from being torn; when the fabric is conveyed by the conveying fixture, the second thrust spring resets, playing an auxiliary role in the conveying fixture.

[0016] A further technical improvement of the present invention is that: a material transfer plate for preventing fabric from rubbing is fixedly installed at the bottom of the guide groove, and two baffles are symmetrically arranged on the front and rear sides of the material transfer plate, and both baffles are fixedly connected to the bottom of the guide groove.

[0017] A further technical improvement of the present invention is that: a needle-punching tool for sewing fabric is fixedly provided on the top of the working plate, the needle-punching tool is prior art, a through groove is provided on the working plate at the corresponding position of the needle-punching tool, a hook-thread tool for sewing fabric is provided below the through groove, and a conveying tool for conveying fabric is provided on one side of the hook-thread tool, both the hook-thread tool and the conveying tool are prior art.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] In use, when the cylinder is in its shortest position, the flip cover is open. Unsewn fabric is neatly placed on the work plate, positioned above the mounting groove. The cylinder's extension, combined with the action of the limiting plate and the second thrust spring, causes the lever to slide a short distance within the groove. This, in conjunction with the second mounting plate, causes the flip cover to cover the unsewn fabric. As the cylinder continues to extend, the second thrust spring contracts, and its force ensures the bottom of the flip cover is in close contact with the work plate. This also ensures that several rubber strips are in close contact with the unsewn fabric. When the conveying fixture transports the fabric, the rubber strips provide friction, keeping the fabric taut during transport and preventing wrinkles. This avoids uneven sewing and improves the overall quality of the fabric.

[0020] When the cylinder output end is extended to its longest state, the locking rod engages with the locking groove to prevent the flip cover from flipping. At this time, the second thrust spring is contracted to its shortest state, preventing several rubber strips from separating from the unsewn fabric during the movement of the unsewn fabric, thereby ensuring the taut state of the unsewn fabric.

[0021] In use, this invention guides the sewn fabric into the guide groove via two baffles, preventing the end of the guide groove from scraping the sewn fabric. The guide groove guides and limits the sewn fabric, reducing the probability of deviation. When the sewn fabric is wound up by the winding fixture, the stitching and hooking fixtures pause during sewing. The lifting seat moves downward under the limiting action of the guide sleeve, squeezing the second thrust spring. This not only winds up the sewn fabric under tension but also prevents it from being torn. When the fabric is conveyed by the conveying fixture, the second thrust spring resets, assisting the conveying fixture. Attached Figure Description

[0022] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 For the present invention Figure 1 Enlarged view of the structure at point A in the middle;

[0025] Figure 3 This is a schematic diagram of the straightening mechanism of the present invention;

[0026] Figure 4 This is a three-dimensional structural schematic diagram of the flip-top cover of the present invention;

[0027] Figure 5 This is a cross-sectional view of the limiting mechanism structure of the present invention;

[0028] Figure 6 This is a three-dimensional schematic diagram of the guide groove structure of the present invention.

[0029] In the diagram: 1. Feeding fixture; 2. Straightening mechanism; 3. Support platform; 4. Hooking fixture; 5. Winding fixture; 6. Working plate; 7. Limiting mechanism; 8. Guide roller; 9. Conveying fixture; 201. Clamping rod; 202. Flip cover; 203. Mounting groove; 204. First mounting plate; 205. Second mounting plate; 206. Fixing plate; 207. Clamping seat; 208. Clamping groove; 209. Limiting plate; 210. Lever; 211. Push-pull plate; 212. Cylinder; 701. Lifting seat; 702. Bracket; 703. Guide groove; 704. Baffle; 705. Guide sleeve; 706. Guide rod; 707. Transfer plate. Detailed Implementation

[0030] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Please see Figures 1-6 As shown, a hook-and-drive mechanism for a sewing machine includes a support platform 3 and a work plate 6 fixed on its top. A fabric-piercing tool 1 for sewing fabric is fixedly installed on the top of the work plate 6. The fabric-piercing tool 1 is prior art. A through groove is opened at the corresponding position of the work plate 6 and the fabric-piercing tool 1. A hook-and-drive tool 4 for sewing fabric is installed below the through groove. A conveying tool 9 for conveying fabric is installed on one side of the hook-and-drive tool 4. Both the hook-and-drive tool 4 and the conveying tool 9 are prior art. A limiting mechanism 7 for preventing fabric deviation is installed on one side of the top of the work plate 6. A straightening mechanism 2 for preventing fabric wrinkles is installed on the other side of the top of the work plate 6.

[0032] Please see Figures 2-4As shown, the straightening mechanism 2 includes a mounting groove 203 on the working plate 6. A flip cover 202 is hinged to one side of the mounting groove 203. First mounting plates 204 are fixedly installed on the top of the inner wall of the flip cover 202 and inside the mounting groove 203. Several rubber strips are provided on the side of the two first mounting plates 204 facing the fabric, and the rubber strips are in contact with the fabric. A drive unit for driving the flip cover 202 to rotate is movably installed on the working plate 6 on one side of the flip cover 202. When the cylinder 212 is in its shortest state, the flip cover 202 is in the open state, and the unsewn fabric is neatly placed on the working plate 6, so that the unsewn fabric is above the mounting groove 203 and extends through the extended end of the cylinder 212. In conjunction with the limiting plate 209 and the second thrust spring, the lever 210 slides a short distance within the groove, thereby cooperating with the second mounting plate 205 to drive the flip cover 202 to cover the unsewn fabric. The extended end of the cylinder 212 continues to extend, causing the second thrust spring to contract. Through the thrust of the second thrust spring, the bottom end of the flip cover 202 comes into close contact with the working plate 6, so that several rubber strips are in close contact with the unsewn fabric. When the conveying fixture 9 conveys the fabric, the several rubber strips provide friction to the unsewn fabric, keeping the unsewn fabric in a taut state during the conveying process, preventing wrinkles from forming during the conveying process, avoiding uneven sewing of the fabric, and improving the product quality of the fabric.

[0033] Please see Figure 3 As shown, the aforementioned drive unit includes a fixed plate 206 fixedly connected to the working plate 6. A cylinder 212 is hinged to the fixed plate 206. A push-pull plate 211 is fixedly installed at the output end of the cylinder 212. A locking rod 201 is fixedly installed on the side of the push-pull plate 211 away from the cylinder 212. Two second mounting plates 205 are symmetrically arranged on the top of the flip cover 202. Each of the two second mounting plates 205 has a sliding groove. A lever 210 is movably arranged in each of the two sliding grooves. Both levers 210 are fixedly connected to the locking rod 201.

[0034] Please see Figure 3 As shown, the slide groove is equipped with a limiting plate 209. The side of the limiting plate 209 contacts the corresponding lever 210. The side of the limiting plate 209 away from the lever 210 is elastically connected to the inner wall of the slide groove through a first thrust spring. When the output end of the cylinder 212 extends to its longest state, the locking lever 201 engages with the locking groove 208 to prevent the flip cover 202 from flipping. At this time, the second thrust spring retracts to its shortest state, preventing several rubber strips from separating from the unsewn fabric during the movement of the unsewn fabric, thereby ensuring the taut state of the unsewn fabric.

[0035] Please see Figure 3As shown, a card holder 207 is fixedly provided on the side of the flip cover 202 away from the fixing plate 206, and a card slot 208 is provided on the card holder 207 to engage with the end of the card rod 201.

[0036] Please see Figure 5 and Figure 6 As shown, the aforementioned limiting mechanism 7 includes a bracket 702 fixedly connected to the working plate 6. The bracket 702 is inclinedly provided with a guide groove 703 for guiding the fabric. A buffer unit for preventing fabric damage is provided on one side of the guide groove 703. A winding fixture 5 for winding the fabric is fixedly installed on the support platform 3. The winding fixture 5 is the prior art.

[0037] Please see Figure 6 As shown, a material transfer plate 707 for preventing fabric from rubbing is fixedly installed at the bottom of the guide groove 703. Two baffles 704 are symmetrically arranged on the front and rear sides of the material transfer plate 707, and both baffles 704 are fixedly connected to the bottom of the guide groove 703.

[0038] Please see Figure 5 As shown, the aforementioned buffer unit includes a guide sleeve 705 fixedly connected to the working plate 6. A lifting seat 701 is slidably disposed on the inner wall of the guide sleeve 705. A transmission roller is rotatably disposed on the top of the lifting seat 701. A guide rod 706 is vertically disposed on the bottom of the inner wall of the guide sleeve 705. The top end of the guide rod 706 is movably inserted into the bottom of the lifting seat 701. A second thrust spring is elastically disposed between the bottom of the inner wall of the guide sleeve 705 and the bottom of the lifting seat 701. The sewn fabric is guided into the guide groove 703 by two baffles 704, preventing the end of the guide groove 703 from being... The sewn fabric is scratched by the guide groove 703, which guides and limits the sewn fabric, reducing the probability of deviation. When the sewn fabric is rolled up by the winding fixture 5, the lifting seat 701 moves downward under the limiting action of the guide sleeve 705 because the stitching fixture 1 and the hooking fixture 4 will pause during the sewing process. This squeezes the second thrust spring, which not only rolls up the sewn fabric in a taut state, but also prevents it from being torn. When the fabric is conveyed by the conveying fixture 9, the second thrust spring resets, which plays an auxiliary role in conveying the fixture 9.

[0039] Please see Figure 1 As shown, a guide roller 8 for conveying the fabric is fixedly installed on the working plate 6 between the above-mentioned material-piercing tool 1 and the limiting mechanism 7.

[0040] Working Principle: In use, when cylinder 212 is in its shortest position, the flip cover 202 is open. Unsewn fabric is neatly placed on the work plate 6, positioned above the mounting groove 203. The extension of cylinder 212, combined with the action of the limiting plate 209 and the second thrust spring, causes the lever 210 to slide a short distance within the groove. This, in conjunction with the second mounting plate 205, drives the flip cover 202 to cover the unsewn fabric. The extended end continues to elongate, causing the second thrust spring to contract. Through the thrust of the second thrust spring, the bottom end of the flip cover 202 comes into close contact with the working plate 6, thus ensuring that several rubber strips are in close contact with the unsewn fabric. When the conveying fixture 9 conveys the fabric, the rubber strips provide friction to the unsewn fabric, keeping it taut during conveying, preventing wrinkles, avoiding uneven sewing, and improving the product quality of the fabric. When the output end of cylinder 212 extends to its longest position, the locking rod 201 engages with the locking groove 208 to prevent the flip cover 202 from flipping. At this time, the second thrust spring retracts to its shortest position, preventing several rubber strips from separating from the unsewn fabric during its movement, thus ensuring the tautness of the unsewn fabric. The sewn fabric is guided into the guide groove 703 by two baffles 704, preventing the end of the guide groove 703 from scraping against the sewn fabric. 3. The sewn fabric is guided and limited, reducing the probability of deviation. When the sewn fabric is wound up by the winding fixture 5, the lifting seat 701 moves downward under the limiting action of the guide sleeve 705 due to the pauses that occur during the sewing process caused by the stitching fixture 1 and the hooking fixture 4. This compresses the second thrust spring, not only winding up the sewn fabric in a taut state but also preventing it from being torn. When the fabric is conveyed by the conveying fixture 9, it is reset by the second thrust spring, thus assisting the conveying fixture 9.

[0041] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0042] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A hook-and-drive mechanism for a sewing machine, comprising a support platform (3) and a work plate (6) fixed on its top, characterized in that: The top side of the working plate (6) is provided with a limiting mechanism (7) to prevent fabric deviation, and the other side of the top of the working plate (6) is provided with a straightening mechanism (2) to prevent fabric wrinkles. The straightening mechanism (2) includes a mounting groove (203) opened on the working plate (6). A flip cover (202) is hinged to one side of the mounting groove (203). A first mounting plate (204) is fixedly provided on the top of the inner wall of the flip cover (202) and in the mounting groove (203). Several rubber strips are provided on the side of the two first mounting plates (204) facing the fabric. A driving unit for driving the flip cover (202) is also movably provided on the working plate (6).

2. The hook-and-drive mechanism for a sewing machine according to claim 1, characterized in that, The drive unit includes a fixed plate (206) fixedly connected to the working plate (6). A cylinder (212) is hinged on the fixed plate (206). A push-pull plate (211) is fixedly installed at the output end of the cylinder (212). A locking rod (201) is fixedly installed on the push-pull plate (211). Two second mounting plates (205) are symmetrically arranged on the top of the flip cover (202). Each of the two second mounting plates (205) has a sliding groove. The locking rod (201) is movably connected to the two sliding grooves through a lever (210).

3. The hook-and-drive mechanism for a sewing machine according to claim 2, characterized in that, A limiting plate (209) is slidably disposed inside the chute. The side of the limiting plate (209) contacts the corresponding lever (210). The side of the limiting plate (209) away from the lever (210) is elastically connected to the inner wall of the chute through a first thrust spring.

4. The hook-and-drive mechanism for a sewing machine according to claim 1, characterized in that, A card holder (207) is fixedly provided on the side of the flip cover (202) away from the fixed plate (206), and a card slot (208) is provided on the card holder (207) to engage with the end of the card rod (201).

5. The hook-and-drive mechanism for a sewing machine according to claim 1, characterized in that, The limiting mechanism (7) includes a bracket (702) fixedly connected to the working plate (6). A guide groove (703) is inclinedly provided on the bracket (702). A buffer unit for preventing fabric damage is provided on one side of the guide groove (703). A winding fixture (5) for winding the fabric is fixedly installed on the support platform (3).

6. The hook-and-drive mechanism for a sewing machine according to claim 5, characterized in that, The buffer unit includes a guide sleeve (705) fixedly connected to the working plate (6). A lifting seat (701) is slidably provided on the inner wall of the guide sleeve (705). A transmission roller is rotatably provided on the top of the lifting seat (701). A guide rod (706) is provided inside the guide sleeve (705). The top end of the guide rod (706) is movably inserted into the bottom of the lifting seat (701). A second thrust spring is elastically provided between the bottom of the inner wall of the guide sleeve (705) and the lifting seat (701).

7. A hook-and-drive mechanism for a sewing machine according to claim 5, characterized in that, A transfer plate (707) is fixedly installed at the bottom of the guide groove (703), and two baffles (704) are symmetrically arranged on both sides of the transfer plate (707).

8. The hook-and-drive mechanism for a sewing machine according to claim 1, characterized in that, The top of the work plate (6) is fixedly provided with a sewing tool (1) for sewing fabric. The work plate (6) and the sewing tool (1) are provided with a through groove at the corresponding position. The bottom of the through groove is provided with a sewing hook tool (4) for sewing fabric. The side of the hook tool (4) is provided with a conveying tool (9) for conveying fabric.

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