Thread trimming and presser foot lifting structure for button sewing machine

Abstract

The utility model belongs to the technical field of button sewing machines, and relates to a structure capable of trimming a thread first and then lifting a presser foot for a button sewing machine, which comprises a rack, a thread trimming device and a presser foot lifting device, a driving motor is arranged on the rack, a driving wheel is fixed on a rotating shaft of the driving motor, and the driving wheel is connected with the thread trimming device and the presser foot lifting device. The thread trimming device and the presser foot lifting device are movably connected with the driving wheel through the starting plate, the driving wheel rotates to sequentially drive the thread trimming device and the presser foot lifting device, a thread trimming groove and a presser foot lifting groove are formed in the starting plate and communicate with each other, and the thread trimming device and the presser foot lifting device are arranged on the starting plate. And the driving wheel is provided with a rolling shaft which is matched with the thread trimming groove and the presser foot lifting groove for use. The utility model aims to provide the structure which is used for the button sewing machine, can solve the problem of complex structure, and is short in thread end after thread trimming.

Description

Technical Field

[0001] This utility model belongs to the field of button attaching machine technology, and specifically refers to a button attaching machine with a structure that cuts the thread first and then lifts the presser foot. Background Technology

[0002] Existing button-attaching machines typically have a presser foot lifting mechanism and a thread-cutting mechanism, usually driven by mechanical force or electromagnets.

[0003] For example, Chinese Utility Model Publication No. CN217459840U discloses a sewing machine comprising: a frame with a first drive rod and a second drive rod hinged to it; a drive disc disposed between the first and second drive rods, wherein the hinge axis of the first drive rod, the hinge axis of the second drive rod, and the axis of the drive disc are arranged parallel to each other; a protrusion on the drive disc, wherein when the drive disc rotates at a first angle in a preset direction, the protrusion contacts one end of the first drive rod to drive the first drive rod to rotate, and when the drive disc rotates at a second angle in the opposite direction of the preset direction, the protrusion contacts one end of the second drive rod to drive the second drive rod to rotate; a drive member connected to the drive disc for driving the drive disc to rotate; a thread cutting mechanism connected to the other end of the first drive rod; and a presser foot mechanism connected to the other end of the second drive rod.

[0004] By using a motor to drive the drive disc to rotate forward and backward, the thread trimming and presser foot lifting processes are completed sequentially, thus solving the technical problem of long thread ends on the finished product caused by simultaneous thread trimming and presser foot lifting in related technologies. However, the structure of this thread trimming and presser foot lifting mechanism is complex. When the drive disc rotates forward, it drives the thread trimming mechanism to complete the thread trimming action. Then, the drive disc rotates backward to drive the presser foot lifting mechanism to complete the presser foot lifting action, resulting in a slow response speed and complex installation and debugging. Therefore, further improvements to this structure are needed. Summary of the Invention

[0005] The purpose of this invention is to provide a structure for button-attaching machines that can solve complex structures and produce short thread ends after cutting, allowing for thread cutting before lifting the presser foot.

[0006] The purpose of this utility model is achieved as follows:

[0007] A pre-cutting and post-lifting presser foot structure for a button-attaching machine includes a frame, a cutting device, and a presser foot lifting device. A drive motor is mounted on the frame, and a drive wheel is fixed to the rotating shaft of the drive motor. The cutting device and the presser foot lifting device are movably connected to the drive wheel via a starter plate. The rotation of the drive wheel sequentially drives the cutting device and the presser foot lifting device. The starter plate has a cutting groove and a presser foot lifting groove, which are connected. A roller that cooperates with the cutting groove and the presser foot lifting groove is mounted on the drive wheel.

[0008] In the above-mentioned structure for a button-attaching machine that cuts the thread before lifting the presser foot, a roller is provided on the roller.

[0009] In the above-mentioned structure for a button-attaching machine that cuts the thread before lifting the presser foot, the thread-cutting groove and the presser foot lifting groove are basically V-shaped.

[0010] In the above-mentioned structure for a button-attaching machine that cuts the thread before lifting the presser foot, the thread-cutting groove is a straight groove structure.

[0011] In the above-mentioned structure for a button-attaching machine that cuts the thread before lifting the presser foot, the presser foot groove is an arc-shaped groove structure.

[0012] In the aforementioned structure for a button-attaching machine that cuts the thread before lifting the presser foot, the thread-cutting device includes a moving blade, a fixed blade, a pusher rod, a thread-cutting pusher rod, an L-shaped thread-cutting lever, and a thread-cutting bracket. The thread-cutting bracket is fixed to the machine frame. The bent part of the L-shaped thread-cutting lever is rotatably connected to the thread-cutting bracket. One end of the lever is fixedly connected to the starting plate, and the other end is movably connected to one end of the thread-cutting pusher rod. The other end of the pusher rod is rotatably connected to the pusher rod. The fixed blade is fixed to the lower side of the machine frame. The moving blade is rotatably connected to the pusher rod, and the side of the moving blade away from the pusher rod is movably connected to the machine frame. The moving blade and the fixed blade cooperate with each other.

[0013] In the above-mentioned structure for a button-attaching machine that cuts the thread before lifting the presser foot, the thread-cutting push rod includes an L-shaped push rod and a fish-eye connector. One end of the fish-eye connector is provided with a threaded rod, and the L-shaped push rod is detachably connected to the fish-eye connector through two nuts and the threaded rod.

[0014] In the above-mentioned structure for a button-attaching machine that cuts the thread before lifting the presser foot, the presser foot lifting device includes a lifting hook, a presser foot lever, a presser foot connecting rod, and a presser foot swing rod. The middle end of the presser foot lever is rotatably connected to the machine frame, and the lifting hook is fixed to one end of the presser foot lever. One end of the presser foot connecting rod is rotatably connected to the other end of the presser foot lever, and one end of the presser foot swing rod is rotatably connected to the starter plate. The other end of the presser foot connecting rod is connected to the middle end of the presser foot swing rod. The presser foot swing rod partially covers the presser foot groove, and the roller enters the presser foot groove to push the presser foot swing rod downward.

[0015] The outstanding and beneficial technical effects of this utility model compared to the prior art are:

[0016] This invention uses a drive wheel on a drive motor and a starter plate to drive a thread-cutting device and a pressing foot lifting device, respectively. A roller on the drive wheel extends into the thread-cutting groove and the pressing foot lifting groove on the starter plate, allowing the thread-cutting device to cut the thread and the pressing foot lifting device to lift the pressing foot. Specifically, the drive wheel rotates, causing the roller to move. As the roller moves within the thread-cutting groove, it simultaneously causes the starter plate to swing. The starter plate pushes an L-shaped thread-cutting lever, which in turn pushes a thread-cutting push rod and a pusher bar. The pusher bar then pushes a moving blade to work with a fixed blade to cut the thread. When the roller continues to move from the thread-cutting groove into the pressing foot lifting groove, it pushes the pressing foot lifting swing rod downwards. This swing rod then moves the pressing foot lifting connecting rod downwards, simultaneously pressing one end of the pressing foot lever downwards and causing the other end of the pressing foot to move the lifting hook upwards, completing the pressing foot lifting action. This solves the technical problem in related technologies where thread cutting and pressing foot lifting occur simultaneously, resulting in long thread ends on the finished product. Furthermore, the simultaneous rotation in the same direction ensures that the thread cutting and pressing foot lifting actions are completed without interruption, resulting in fast and stable execution. Attached Figure Description

[0017] Figure 1 This is a simplified structural diagram of the present invention.

[0018] Figure 2 This is one of the internal structural diagrams of this utility model.

[0019] Figure 3 This is the second schematic diagram of the internal structure of this utility model.

[0020] Figure 4 This is an enlarged view of point A of this utility model.

[0021] Figure 5 This is the third schematic diagram of the internal structure of this utility model.

[0022] Figure 6 This is an enlarged view of section B of this utility model.

[0023] 1-Frame; 2-Wire cutting device; 3-Pressure foot lifting device; 4-Starting plate; 5-Drive wheel; 21-Moving blade;

[0024] 22-Fixed blade; 23-Push blade lever; 24-Wire cutting push rod; 25-L-shaped wire cutting lever; 26-Wire cutting bracket; 30-Roller; 31-Lifting hook; 32-Pressure foot lifting lever; 33-Pressure foot lifting connecting rod; 34-Pressure foot lifting swing rod; 41-Wire cutting groove;

[0025] 42-Lifting foot groove; 241-L-shaped push rod; 242-Fish eye connector; 243-Threaded rod; 244-Nut; 301-Roller. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0027] like Figures 1-6 As shown: A structure for a button-attaching machine that cuts the thread before lifting the presser foot includes a frame 1, a thread-cutting device 2, and a presser foot lifting device 3. A drive motor is mounted on the frame 1, and a drive wheel 5 is fixed to the rotating shaft of the drive motor. The thread-cutting device 2 and the presser foot lifting device 3 are movably connected to the drive wheel 5 via a starting plate 4. The rotation of the drive wheel 5 sequentially drives the thread-cutting device 2 and the presser foot lifting device 3. The starting plate 4 is provided with a thread-cutting groove 41 and a presser foot lifting groove 42. The grooves 42 are connected, and the drive wheel 5 is provided with a roller 30 that works with the wire cutting groove 41 and the pressing foot groove 42. In this invention, the drive wheel on the drive motor and the starter plate drive the wire cutting device and the pressing foot lifting device respectively. The roller on the drive wheel extends into the wire cutting groove and the pressing foot lifting groove on the starter plate, which can drive the wire cutting device to cut the wire and the pressing foot lifting device to lift the pressing foot. Cutting the wire first and then lifting the pressing foot can shorten the length of the wire end. Moreover, compared with the prior art, the structure of this invention is relatively simple.

[0028] In the above-mentioned structure for a button-attaching machine that cuts the thread before lifting the presser foot, the roller 30 is provided with a roller 301. Specifically, the roller is designed to reduce the friction between the roller and the thread cutting groove and the presser foot lifting groove, thereby extending their service life.

[0029] In the above-mentioned structure for a button-attaching machine that cuts the thread before lifting the presser foot, the thread-cutting groove 41 and the presser foot lifting groove 42 are basically V-shaped. The thread-cutting groove 41 is a straight groove, and the presser foot lifting groove 42 is an arc-shaped groove. Specifically, this is to adapt to the presser foot lifting device and the thread-cutting device and ensure that the two devices can operate stably.

[0030] In the above-described structure for a button-attaching machine that cuts the thread before lifting the presser foot, the thread-cutting device 2 includes a moving blade 21, a fixed blade 22, a pusher rod 23, a thread-cutting pusher rod 24, an L-shaped thread-cutting lever 25, and a thread-cutting bracket 26. The thread-cutting bracket 26 is fixed on the frame 1. The bent part of the L-shaped thread-cutting lever 25 is rotatably connected to the thread-cutting bracket 26. One end of the lever is fixedly connected to the starting plate 4, and the other end is movably connected to one end of the thread-cutting pusher rod 24. The other end of the pusher rod 24 is rotatably connected to the pusher rod 23. The fixed blade 22 is fixed on the lower side of the frame 1. The moving blade 21 is rotatably connected to the pusher rod 23, and the side of the moving blade 21 away from the pusher rod 23 is movably connected to the frame 1. The moving blade 21 and the fixed blade 22 cooperate with each other.

[0031] In the above-mentioned structure for a button-attaching machine that cuts the thread before lifting the presser foot, the thread-cutting push rod 24 includes an L-shaped push rod 241 and a fish-eye connector 242. One end of the fish-eye connector 242 is provided with a threaded rod 243. The L-shaped push rod 241 is detachably connected to the fish-eye connector 242 through two nuts 244 and the threaded rod 243. Specifically, the fish-eye arrow and the L-shaped push rod are connected through the threaded rod and are detachably connected through two nuts, which is convenient for connection and the length can also be adjusted.

[0032] In the above-mentioned structure for a button-attaching machine that cuts the thread before lifting the presser foot, the presser foot lifting device 3 includes a lifting hook 31, a presser foot lifting lever 32, a presser foot lifting connecting rod 33, and a presser foot lifting swing rod 34. The middle end of the presser foot lifting lever 32 is rotatably connected to the frame 1, and the lifting hook 31 is fixed to one end of the presser foot lifting lever 32. One end of the presser foot lifting connecting rod 33 is rotatably connected to the other end of the presser foot lifting lever 32, and one end of the presser foot lifting swing rod 34 is rotatably connected to the starting plate 4. The other end of the presser foot lifting connecting rod 33 is connected to the middle end of the presser foot lifting swing rod 34. The presser foot lifting swing rod 34 partially covers the presser foot groove 42, and the roller 30 enters the presser foot groove 42 to push the presser foot lifting swing rod 34 downward. Specifically, this is to facilitate the presser foot lifting device to lift the presser foot.

[0033] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection of the present utility model.

Claims

1. A structure for a button-attaching machine that cuts the thread before lifting the presser foot, characterized in that: The device includes a frame (1), a wire cutting device (2), and a pressing foot lifting device (3). A drive motor is installed on the frame (1), and a drive wheel (5) is fixed on the rotating shaft of the drive motor. The wire cutting device (2) and the pressing foot lifting device (3) are movably connected to the drive wheel (5) through a starter plate (4). The drive wheel (5) rotates and drives the wire cutting device (2) and the pressing foot lifting device (3) in turn. The starter plate (4) is provided with a wire cutting groove (41) and a pressing foot lifting groove (42). The wire cutting groove (41) and the pressing foot lifting groove (42) are connected. The drive wheel (5) is provided with a roller (30) that works with the wire cutting groove (41) and the pressing foot lifting groove (42).

2. The structure for a button-attaching machine that cuts the thread before lifting the presser foot according to claim 1, characterized in that: The roller (30) is provided with a roller (301).

3. The structure for a button-attaching machine that cuts the thread before lifting the presser foot according to claim 1, characterized in that: The wire cutting groove (41) and the foot lifting groove (42) are basically V-shaped.

4. The structure for a button-attaching machine that cuts the thread before lifting the presser foot according to claim 2, characterized in that: The shearing groove (41) is a straight groove structure.

5. The structure for a button-attaching machine that cuts the thread before lifting the presser foot according to claim 2, characterized in that: The lifting foot groove (42) is an arc-shaped groove structure.

6. The structure for a button-attaching machine that cuts the thread before lifting the presser foot according to claim 1, 2, 3, 4, or 5, characterized in that: The wire cutting device (2) includes a moving blade (21), a fixed blade (22), a pusher rod (23), a wire cutting pusher rod (24), an L-shaped wire cutting lever (25), and a wire cutting bracket (26). The wire cutting bracket (26) is fixed on the frame (1). The bent part of the L-shaped wire cutting lever (25) is rotatably connected to the wire cutting bracket (26). One end of the lever is fixedly connected to the starter plate (4), and the other end is movably connected to one end of the wire cutting pusher rod (24). The other end of the pusher rod (24) is rotatably connected to the pusher rod (23). The fixed blade (22) is fixed on the lower side of the frame (1). The moving blade (21) is rotatably connected to the pusher rod (23). The side of the moving blade (21) away from the pusher rod (23) is movably connected to the frame (1). The moving blade (21) and the fixed blade (22) cooperate with each other.

7. The structure for a button-attaching machine that cuts the thread before lifting the presser foot according to claim 6, characterized in that: The wire-cutting push rod (24) includes an L-shaped push rod (241) and a fish-eye connector (242). One end of the fish-eye connector (242) is provided with a threaded rod (243). The L-shaped push rod (241) is detachably connected to the fish-eye connector (242) by two nuts (244) and the threaded rod (243).

8. The structure for a button-attaching machine that cuts the thread before lifting the presser foot according to claim 6, characterized in that: The foot lifting device (3) includes a hook (31), a foot lifting lever (32), a foot lifting connecting rod (33), and a foot lifting swing rod (34). The middle end of the foot lifting lever (32) is rotatably connected to the frame (1), and the hook (31) is fixed to one end of the foot lifting lever (32). One end of the foot lifting connecting rod (33) is rotatably connected to the other end of the foot lifting lever (32), and one end of the foot lifting swing rod (34) is rotatably connected to the starter plate (4). The other end of the foot lifting connecting rod (33) is connected to the middle end of the foot lifting swing rod (34). Part of the foot lifting swing rod (34) covers the foot lifting groove (42), and the roller (30) enters the foot lifting groove (42) to push the foot lifting swing rod (34) downward.

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