Bird nest prevention mechanism for a roller car

Abstract

The utility model provides a kind of anti-nest mechanism of roller car, belong to roller car technical field.It solves the problem of excessive thread left after thread cutting of the thread cutter of roller car in prior art.The anti-nest mechanism of roller car, including the thread cutting moving cutter being set on the outside of the rotating hook and being able to rotate around rotating hook, the upper surface of the thread cutting moving cutter has the first moving cutter blade and the second moving cutter blade being adjacently arranged, the thread cutting fixed cutter and the thread pressing piece located below the needle plate are further respectively fixedly connected on the machine base, the lower surface of the needle plate has the accommodation slot, the thread cutting fixed cutter is located in the accommodation slot, and the blade of the thread cutting fixed cutter is adjacently arranged with the needle hole, the thread pressing piece is located directly below the thread cutting fixed cutter, and the thread pressing piece can be attached with the lower surface of the thread cutting moving cutter during thread cutting, the first moving cutter blade and the second moving cutter blade can be in turn engaged with the blade of thread cutting fixed cutter to cut thread.The utility model has the advantage of avoiding the formation of nest-like stitch.

Description

Technical Field

[0001] This utility model belongs to the field of roller machine technology and relates to a roller machine anti-bird nest mechanism. Background Technology

[0002] A roller sewing machine is a type of sewing machine commonly used for sewing riding boots, athletic shoes, casual shoes, sponge shoes, high-grade leather shoes, and bags. For example, Chinese patent literature discloses an integrated direct-drive automatic thread-cutting roller sewing machine suitable for thin materials (authorization announcement number: CN216427605U). The bottom of the roller sewing machine is provided with a base plate, a fixed plate is installed on the top of the base plate and located at the bottom of the roller sewing machine, a shearing plate is installed on the left end of the fixed plate, and a shearing groove is provided in the middle area of ​​the front end of the shearing plate. The lower plate and the upper plate are installed parallel to each other on the left end of the fixed plate and located at the front end of the shearing plate. The left end of the fixed plate is provided with a limit plate and located at the front end of the lower plate and the upper plate. The reciprocating motor has a conveyor shaft at its output end, which runs longitudinally through and is rotatably installed on the fixed plate. The bottom end of the conveyor shaft is rotatably connected to the top end of the base plate.

[0003] The integrated direct-drive automatic thread-cutting roller has the following shortcomings during use: When cutting the thread, the motor drives the blade to rotate and make the thread contact the cutting groove to cut the thread in the fabric. This results in a relatively long thread left on the leather after cutting, which causes the thread ends to form bird's nest-like thread ends on the sewn material in the next sewing process, affecting the sewing quality. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing an anti-bird nest mechanism for roller machines. The technical problem this invention aims to solve is the excessively long thread ends left after cutting thread by the wire cutter in existing roller machines.

[0005] The objective of this utility model can be achieved through the following technical solutions:

[0006] A bird nest prevention mechanism for a roller carriage includes a base, a needle plate with pinholes disposed on the base, and a rotary hook disposed below the needle plate. The mechanism includes a thread-cutting blade disposed outside the rotary hook and capable of rotating around it. The upper surface of the thread-cutting blade has adjacent first and second moving blades. The base also has a thread-cutting fixed blade and a thread-pressing plate fixedly connected below the needle plate. The lower surface of the needle plate has a clearance groove, and the thread-cutting fixed blade is located within this groove, with its blade adjacent to the pinholes. The thread-pressing plate is located directly below the thread-cutting fixed blade, and during thread cutting, it can contact the lower surface of the thread-cutting blade. The first and second moving blades sequentially engage with the blade of the thread-cutting fixed blade to cut the thread.

[0007] When this roller sewing machine cuts thread, the first moving blade of the thread-cutting knife engages with the blade of the fixed thread-cutting knife to cut the thread. After cutting the thread, the needle continues to make the first stitch. After the needle reaches its lowest point, it begins to rise. Due to inertia, the thread remains under the fabric, forming a loop. Then, the moving blade continues to rotate and engages with the fixed thread-cutting knife to catch the loop located below the moving blade. The needle then sews several more times. Then, the moving blade continues to rotate, causing the second moving blade to engage with the blade of the fixed thread-cutting knife to cut off the loop. In other words, the anti-bird's nest mechanism of this roller sewing machine, through secondary thread cutting, and by ensuring that the cutting position of the moving and fixed thread-cutting blades is as close to the needle hole as possible, ensures that the remaining thread end on the fabric is short enough. This solves the problem of excessively long thread ends left after cutting the thread in existing roller sewing machines, avoids the formation of bird's nest-like stitches, and improves the aesthetics of the stitches.

[0008] In the aforementioned anti-bird nest mechanism for a roller car, a suction pipe is also fixedly connected to the base. The suction pipe is located directly below the thread pressing plate, and its suction port faces the needle hole of the needle plate. The suction pipe can absorb the thread ends after cutting, preventing them from falling into the gap below the rotary hook and thus avoiding affecting the normal operation of the roller car.

[0009] In the aforementioned anti-bird nest mechanism for a roller conveyor, the end of the moving wire cutter facing the fixed wire cutter is V-shaped, and the other end of the moving wire cutter is provided with a second moving blade. The moving wire cutter also has a wire-passing hole, with the first and second moving blades located on opposite sides of the wire-passing hole. The V-shaped end of the moving wire cutter facilitates hooking the thread loop and pulling it towards the fixed wire cutter. The first and second moving blades, located on opposite sides of the wire-passing hole, enable better secondary wire cutting.

[0010] In the aforementioned anti-bird nest mechanism for a roller machine, a pull rod and a cam are provided on the base. The end face of the cam has a spiral limiting groove. One side of the pull rod has a limiting post, which is movably and vertically embedded in the limiting groove. The other side of the pull rod is also hinged with a wire-cutting swing rod for driving the pull rod to swing horizontally. The pull rod is connected to a moving blade shaft perpendicular to it through a wire-cutting crank, and the wire-cutting moving blade is fixedly connected to the moving blade shaft. During use, a motor is fixedly connected to the base. The thread-cutting swing rod is fixed to the output shaft of the motor and is driven to rotate by the motor. After the thread-cutting swing rod rotates, it can drive the pull rod to swing horizontally. After the pull rod swings, it can drive the moving blade shaft and the thread-cutting moving blade fixed to the moving blade shaft to rotate relative to the rotary hook. This allows the thread-cutting moving blade to contact and cooperate with the thread-cutting fixed blade to cut the thread. At the same time, the pressure plate can cooperate with the thread-cutting moving blade to clamp the bottom thread after cutting the front thread and the bottom thread, thereby ensuring that the next sewing can form a thread loop. The suction pipe can absorb the thread ends after cutting, preventing the thread ends from falling into the gap under the rotary hook and avoiding affecting the normal operation of the roller.

[0011] In the aforementioned anti-bird nest mechanism for a roller sewing machine, a mounting base is also fixedly connected to the machine base. The thread-cutting fixed blade, the thread-pressing plate, and the suction pipe are all fixedly connected to the mounting base. The fixed positions of the thread-cutting fixed blade and the suction pipe are opposite to each other, and the fixed position of the thread-pressing plate is located between the thread-cutting fixed blade and the suction pipe. This makes the structure of the anti-bird nest mechanism more compact, and also allows the thread-pressing plate to better cooperate with the thread-cutting moving blade to clamp the bottom thread after cutting the top and bottom threads, thereby ensuring that a thread loop can be formed for the next stitch. At the same time, it allows the suction pipe to more quickly absorb the thread ends after cutting, preventing the thread ends from falling into the gap below the rotary hook and avoiding affecting the normal operation of the roller sewing machine.

[0012] Compared with existing technologies, the advantages of the anti-bird's nest mechanism of this roller sewing machine are as follows: When the roller sewing machine cuts the thread, the first moving blade of the thread-cutting knife first engages with the blade of the fixed thread-cutting knife to cut the thread. After the thread is cut, the needle continues to make the first stitch. After the needle reaches its lowest point, it begins to rise. Due to inertia, the thread remains under the fabric, forming a loop. Then, the moving blade continues to rotate and engages with the fixed thread-cutting knife to catch the loop located below the moving blade. Then, the needle sews several more times. Then, the moving blade continues to rotate, causing the second moving blade to engage with the blade of the fixed thread-cutting knife to cut off the loop. In other words, the anti-bird's nest mechanism of this roller sewing machine, through two thread cuttings, and by ensuring that the cutting position of the moving blade and the fixed thread-cutting knife is as close as possible to the needle hole, can ensure that the remaining thread end on the fabric is short enough. This solves the problem of excessively long thread ends left after cutting the thread in existing roller sewing machines, avoids the formation of bird's nest-like stitches, and improves the aesthetics of the stitches. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of the bird nest prevention mechanism of the Benroh car.

[0014] Figure 2 This is a cross-sectional view of the bird nest prevention mechanism of the Benroh car.

[0015] Figure 3 This is an exploded diagram of the bird-nesting mechanism on the Benroh car.

[0016] In the diagram, 1. Needle plate; 1a. Needle hole; 1b. Relief groove; 2. Rotary hook; 3. Thread cutting moving blade; 3a. First moving blade; 3b. Second moving blade; 3c. Thread passage hole; 4. Thread cutting fixed blade; 5. Thread pressing plate; 6. Suction pipe; 6a. Suction port; 7. Pull rod; 7a. Limiting post; 8. Cam; 8a. Limiting groove; 9. Thread cutting swing rod; 10. Thread cutting crank; 11. Moving blade shaft; 12. Mounting base. Detailed Implementation

[0017] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0018] A bird nest prevention mechanism for a roller car, as shown in the reference. Figure 1-3 The roller carriage includes a base, a needle plate 1 with a needle hole 1a disposed on the base, and a rotary hook 2 disposed below the needle plate 1. The anti-bird nest mechanism includes a thread-cutting blade 3 disposed outside the rotary hook 2 and capable of rotating around the rotary hook 2. The upper surface of the thread-cutting blade 3 has a first moving blade 3a and a second moving blade 3b disposed adjacent to each other. The base is also fixedly connected to a thread-cutting fixed blade 4 and a thread-pressing plate 5 located below the needle plate 1. The lower surface of the needle plate 1 has a relief groove 1b. The thread-cutting fixed blade 4 is located in the relief groove 1b, and the blade of the thread-cutting fixed blade 4 is disposed adjacent to the needle hole 1a. The thread-pressing plate 5 is located directly below the thread-cutting fixed blade 4, and during the thread-cutting process, the thread-pressing plate 5 can fit against the lower surface of the thread-cutting blade 3. The first moving blade 3a and the second moving blade 3b can sequentially engage with the blade of the thread-cutting fixed blade 4 to cut the thread.

[0019] Reference Figure 1 and Figure 3 Furthermore, a suction pipe 6 is also fixedly connected to the base. The suction pipe 6 is located directly below the pressure plate 5, and the suction port 6a of the suction pipe 6 is arranged facing the needle hole 1a of the needle plate 1.

[0020] Reference Figure 3 Specifically, the end of the moving wire cutter 3 facing the fixed wire cutter 4 is V-shaped, and the other end of the moving wire cutter 3 is provided with a second moving blade 3b. The moving wire cutter 3 also has a wire passage hole 3c, and the first moving blade 3a and the second moving blade 3b are respectively located on both sides of the wire passage hole 3c.

[0021] Reference Figure 1 and Figure 3 More specifically, the base is provided with a pull rod 7 and a cam 8. The end face of the cam 8 has a spiral limiting groove 8a. One side face of the pull rod 7 has a limiting post 7a. The limiting post 7a is movably and vertically embedded in the limiting groove 8a. The other side face of the pull rod 7 is also hinged with a wire-cutting swing rod 9 for driving the pull rod 7 to swing horizontally. The pull rod 7 is connected to a moving blade shaft 11 perpendicular to it through a wire-cutting crank 10. The wire-cutting moving blade 3 is fixedly connected to the moving blade shaft 11.

[0022] Reference Figure 1 and Figure 3 More specifically, a mounting base 12 is also fixedly connected to the base. The wire cutting blade 4, the wire pressing plate 5, and the suction pipe 6 are all fixedly connected to the mounting base 12. The fixed positions of the wire cutting blade 4 and the suction pipe 6 are opposite to each other, and the fixed position of the wire pressing plate 5 is located between the wire cutting blade 4 and the suction pipe 6.

[0023] In use, a motor (not shown in the motor diagram) is also fixedly connected to the base. The thread-cutting swing rod 9 is fixedly connected to the output shaft of the motor and is driven to rotate by the motor. After the thread-cutting swing rod 9 rotates, it can drive the pull rod 7 to swing horizontally. After the pull rod 7 swings, it can drive the moving blade shaft 11 and the thread-cutting moving blade 3 fixedly connected to the moving blade shaft 11 to rotate relative to the rotary hook 2. This causes the first moving blade 3a of the thread-cutting moving blade 3 to engage with the blade of the thread-cutting fixed blade 4 to cut the thread. At the same time, the pressing plate 5 can cooperate with the thread-cutting moving blade 3 to clamp the bottom thread after cutting the thread and the bottom thread, thereby ensuring that the next stitch can form a thread. After the thread is cut, the needle makes its first stitch, passing through the thread-cutting blade 3 and the thread hole 3c, and then descends to its lowest point before rising again. Due to inertia, the thread remains under the fabric, forming a loop. Then, the thread-cutting blade 3 continues to rotate and engages with the thread-cutting fixed blade 4, locking the loop below the thread-cutting blade 3. The needle then sews several more times, and the thread-cutting blade 3 continues to rotate, causing the second moving blade 3b to engage with the blade of the thread-cutting fixed blade 4 to cut off the loop. Meanwhile, the suction pipe 6 absorbs the thread ends after cutting, preventing them from falling into the gap below the rotary hook 2 and affecting the normal operation of the roller.

[0024] The anti-bird's nest mechanism of this roller sewing machine uses a secondary thread cutting method. At the same time, the thread cutting fixed blade 4 is placed in the clearance groove 1b opened on the lower surface of the needle plate 1 near the needle hole 1a, and the blade of the thread cutting fixed blade 4 is arranged adjacent to the needle hole 1a. This makes the position where the blade of the thread cutting moving blade 3 and the blade of the thread cutting fixed blade 4 cooperate to cut the thread as close as possible to the needle hole 1a. This ensures that the remaining thread end on the sewing material is short enough, thereby solving the problem of excessively long thread ends left after cutting the thread by the thread cutter of existing roller sewing machines, avoiding the formation of bird's nest-like stitches, and improving the aesthetics of the stitches.

[0025] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A bird-nest prevention mechanism for a roller carriage, the roller carriage comprising a base, a needle plate (1) having a needle hole (1a) disposed on the base, and a rotary hook (2) disposed below the needle plate (1), the bird-nest prevention mechanism comprising a thread-cutting blade (3) disposed outside the rotary hook (2) and rotatable around the rotary hook (2), characterized in that, The upper surface of the moving blade (3) has a first moving blade (3a) and a second moving blade (3b) arranged adjacent to each other. The base is also fixedly connected to a fixed blade (4) and a pressure plate (5) located below the needle plate (1). The lower surface of the needle plate (1) has a relief groove (1b). The fixed blade (4) is located in the relief groove (1b), and the blade of the fixed blade (4) is arranged adjacent to the needle hole (1a). The pressure plate (5) is located directly below the fixed blade (4), and during the cutting process, the pressure plate (5) can fit against the lower surface of the moving blade (3). The first moving blade (3a) and the second moving blade (3b) can sequentially engage with the blade of the fixed blade (4) to cut the thread.

2. The anti-bird nest mechanism for a roller car according to claim 1, characterized in that, The base is also fixedly connected to a suction pipe (6), which is located directly below the pressure plate (5), and the suction port (6a) of the suction pipe (6) is set towards the needle hole (1a) of the needle plate (1).

3. The anti-bird nest mechanism for a roller car according to claim 1 or 2, characterized in that, The end of the moving wire cutter (3) facing the fixed wire cutter (4) is V-shaped, and the other end of the moving wire cutter (3) is provided with a second moving blade (3b). The moving wire cutter (3) also has a wire passage hole (3c). The first moving blade (3a) and the second moving blade (3b) are located on both sides of the wire passage hole (3c).

4. The anti-bird nest mechanism for a roller car according to claim 3, characterized in that, The base is provided with a pull rod (7) and a cam (8). The end face of the cam (8) has a spiral limiting groove (8a). The pull rod (7) has a limiting post (7a) on one side. The limiting post (7a) is movably and vertically embedded in the limiting groove (8a). The other side of the pull rod (7) is also hinged with a wire-cutting swing rod (9) for driving the pull rod (7) to swing horizontally. The pull rod (7) is connected to a moving blade shaft (11) perpendicular to it through a wire-cutting crank (10). The wire-cutting moving blade (3) is fixedly connected to the moving blade shaft (11).

5. The anti-bird nest mechanism for a roller car according to claim 2, characterized in that, A mounting base (12) is also fixedly connected to the base. The wire cutting blade (4), the wire pressing plate (5), and the suction pipe (6) are all fixedly connected to the mounting base (12). The fixed positions of the wire cutting blade (4) and the suction pipe (6) are arranged opposite to each other. The fixed position of the wire pressing plate (5) is located between the wire cutting blade (4) and the suction pipe (6).

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