A sewing machine

Abstract

The application provides a sewing machine and belongs to the technical field of sewing equipment. The sewing machine comprises a cloth feeding mechanism, a thread cutting mechanism and a presser foot lifting mechanism. The sewing machine further comprises a motor. The motor is a double-head motor. A crank I for driving the presser foot to move upwards is installed on one end of the output shaft of the motor. A rotating disc for driving the cloth feeding mechanism to feed cloth and a crank II for driving the thread cutting mechanism to cut thread are installed on the other end of the output shaft of the motor. The sewing machine independently drives the cloth feeding mechanism, the thread cutting mechanism and the presser foot lifting mechanism by one motor, realizes three actions of cloth feeding, thread cutting and presser foot lifting, uses one driving source to complete the required actions, simplifies the structure and improves the working efficiency.

Description

Technical Field

[0001] This invention belongs to the field of sewing equipment technology and relates to a sewing machine. Background Technology

[0002] When a sewing machine is sewing, it often needs to perform actions such as feeding fabric, cutting thread, and lifting presser foot. Accordingly, a sewing machine has a fabric feeding mechanism, a thread cutting mechanism, and a presser foot lifting mechanism. In the existing technology, the fabric feeding mechanism, the thread cutting mechanism, and the presser foot lifting mechanism are generally independent mechanisms, driven by different motors or electromagnets, which occupy a lot of space and have high costs.

[0003] In some sewing machines, there is a motor-driven mechanism for cutting the thread and lifting the presser foot, such as the thread cutting and presser foot lifting mechanism for a sewing machine provided in application number 202022393721.7. Its shortcoming is that the fabric feeding mechanism requires a separate drive source. It can be seen that the existing technology still has certain defects. Summary of the Invention

[0004] To address the aforementioned problems in the prior art, this invention provides a sewing machine. The technical problem this invention aims to solve is: how to achieve fabric feeding, thread cutting, and presser foot lifting actions through a single drive source.

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

[0006] A sewing machine includes a fabric feeding mechanism, a thread cutting mechanism, and a presser foot lifting mechanism. The sewing machine further includes a motor, which is a double-headed motor. A crank (first crank) for driving the presser foot upwards is mounted on one end of the motor's output shaft, and a turntable for driving the fabric feeding mechanism to feed fabric and a crank (second crank) for driving the thread cutting mechanism to cut thread are mounted on the other end of the motor's output shaft.

[0007] Its working principle is as follows: When this sewing machine is working, the motor drives the turntable to swing back and forth. The swinging turntable drives the fabric feeding mechanism to swing, causing the feed teeth on the fabric feeding mechanism to make elliptical motion, thus feeding the fabric. When it is necessary to cut the thread, the motor drives the turntable to rotate a larger angle, after which the turntable disengages from the fabric feeding mechanism, and the fabric feeding mechanism stops feeding the fabric. Meanwhile, crank two drives the thread cutting mechanism to operate, and the thread cutting mechanism cuts the thread on the fabric. The motor drives crank one, and crank one drives the presser foot lifting mechanism to swing. The presser foot lifting mechanism drives the presser foot to move upward, thus lifting the presser foot. After that, the motor continues to rotate. When crank two rotates to a certain angle, the thread cutting mechanism resets. After the motor rotates one revolution, the turntable re-engages with the fabric feeding mechanism, and the turntable continues to swing back and forth, driving the fabric feeding mechanism to swing, thus continuing to feed the fabric.

[0008] This sewing machine uses a dual-head motor, which independently drives the fabric feeding mechanism, thread cutting mechanism, and presser foot lifting mechanism to achieve the three actions of feeding fabric, cutting thread, and lifting presser foot. It uses a single drive source to complete the required actions, simplifying the structure and improving work efficiency.

[0009] In the aforementioned sewing machine, a swing arm is installed on the fabric feeding mechanism, and a roller is connected to the swing arm. The turntable has a groove on its periphery. When the roller is engaged in the groove, the turntable can push the swing arm to swing.

[0010] In this structure, the first roller on the swing arm can be engaged in the groove of the turntable. When the motor drives the turntable to swing back and forth, the turntable drives the fabric feeding mechanism to swing through the first roller and the swing arm to achieve fabric feeding.

[0011] In the aforementioned sewing machine, a bracket is mounted on one end of the motor, the bracket having two opposing bosses, and a roller is located between the two bosses and can abut against the bosses.

[0012] During fabric feeding, roller one oscillates back and forth between two oppositely positioned bosses. The bosses act as limiters for roller one, and this structure can limit the oscillation angle of roller one within a suitable range, thereby adjusting the oscillation amplitude of the feed teeth during fabric feeding. When thread cutting is required, the motor drives the turntable to rotate at a larger angle, and roller one abuts against one of the bosses after rotating with the turntable. The turntable continues to rotate, and roller one stops rotating. Afterward, the turntable disengages from roller one, and the fabric feeding mechanism stops feeding fabric.

[0013] In one of the sewing machines described above, a bolt is threaded onto the boss, the bolt's thread protrudes from the boss, and the roller can abut against the thread or a boss.

[0014] In this structure, during fabric feeding, roller one oscillates back and forth between a screw and a boss. The screw and the boss together limit the movement of the roller. By rotating the bolt on one boss and adjusting the relative position of the screw and the other boss, the oscillation angle of roller one can be adjusted as needed, thereby adjusting the oscillation amplitude of the feed teeth during fabric feeding and improving the smoothness of fabric feeding.

[0015] In the aforementioned sewing machine, a crank is mounted on the swing arm, and a spring is connected to the outer end of the crank to the bracket. The spring is in a stretched state and causes the roller to tend to abut against the periphery or groove of the turntable.

[0016] In this structure, the stretched spring applies a force to the first roller through the crank, which keeps the first roller against the circumference of the turntable or in the groove of the turntable. This structure makes the first roller in soft contact with the turntable, and the first roller is tightly locked in the groove, making it difficult to fall off, thus ensuring good transmission effect.

[0017] In the sewing machine described above, the thread-cutting mechanism includes a swingable irregular ring. The irregular ring includes an arc-shaped segment, a thread-cutting segment, and a reset segment connected on one side. A roller is mounted on one end of the crank two. The roller two is located in the irregular ring. When the roller two abuts against the thread-cutting segment, the roller two can push the irregular ring to swing.

[0018] Roller 2 is located inside the irregularly shaped ring. During fabric feeding, roller 2 swings within the arc segment. The trajectory of roller 2 is consistent with the extension direction of the arc segment. Even when roller 2 contacts the arc segment, it does not push the irregularly shaped ring to swing. At this time, the thread-cutting mechanism does not operate. When thread cutting is required, the motor drives the turntable to rotate at a larger angle. Roller 1 rotates with the turntable and abuts against a boss. The turntable continues to rotate, and roller 1 stops rotating. Then, the turntable disengages from roller 1, and the fabric feeding mechanism stops feeding. At this time, roller 2 swings to the thread-cutting segment and abuts against it. The shearing segment pushes the irregular ring to swing, which in turn drives the thread-cutting mechanism to cut the threads on the fabric. The motor then continues to rotate. When roller two moves to the reset section, the thread-cutting mechanism begins to reset. After the motor rotates one revolution, roller one on the swing arm is re-engaged in the groove of the turntable. The motor then drives the turntable to swing back and forth. The turntable drives the fabric feeding mechanism to swing through the swing arm, and the fabric feeding mechanism continues to feed the fabric. At this time, roller two rotates to the arc segment, and the trajectory of roller two is consistent with the extension direction of the arc segment. At this time, the thread-cutting mechanism does not operate.

[0019] When roller two moves to the reset section, if the wire cutting mechanism does not start to reset, roller two will rotate to the arc section and push the irregular ring to swing in the opposite direction, so that the wire cutting mechanism will gradually reset until the movement trajectory of roller two is consistent with the extension direction of the arc section, at which point the wire cutting mechanism will stop moving.

[0020] In the sewing machine described above, a connecting rod is installed on the presser foot lifting mechanism, and a roller three is installed on one end of the crank one. The roller three can abut against the connecting rod and push the connecting rod to swing.

[0021] When the motor drives crank one to swing, crank one pushes the connecting rod upward through roller three. The connecting rod drives the presser foot to move upward through the presser foot lifting mechanism, thereby lifting the presser foot.

[0022] In the sewing machine described above, the motor is a stepper motor.

[0023] Compared with the prior art, the advantages of the present invention are as follows:

[0024] 1. This sewing machine uses a single motor to independently drive the fabric feeding mechanism, thread cutting mechanism, and presser foot lifting mechanism, achieving the three actions of fabric feeding, thread cutting, and presser foot lifting. It uses a single drive source to complete the required actions, simplifying the structure and improving work efficiency.

[0025] 2. The spring in this sewing machine keeps roller 1 against the circumference of the turntable or in the groove of the turntable. Roller 1 is tightly engaged in the groove and is not easy to fall off, ensuring good transmission effect. Attached Figure Description

[0026] Figure 1 This is a structural diagram of the sewing machine (the machine casing is not shown);

[0027] Figure 2 This is a schematic diagram of crank two and turntable mounted on the motor;

[0028] Figure 3 This is a schematic diagram of crank one mounted on the motor;

[0029] Figure 4 This is a schematic diagram of the turntable's structure;

[0030] Figure 5 This is a schematic diagram of the support structure;

[0031] Figure 6 This is a schematic diagram of the irregular ring structure.

[0032] In the diagram: 1. Fabric feeding mechanism, 2. Thread cutting mechanism, 3. Presser foot lifting mechanism, 4. Motor, 5. Crank 1, 6. Turntable, 7. Crank 2, 8. Swing rod, 9. Roller 1, 10. Groove, 11. Bracket, 12. Boss, 13. Bolt, 14. Crank rod, 15. Spring, 16. Irregular ring, 17. Arc segment, 18. Thread cutting segment, 19. Reset segment, 20. Connecting rod, 21. Roller 3, 22. Presser foot, 23. Roller 2. Detailed Implementation

[0033] The following are specific embodiments of the present invention, and the technical solutions of the present invention will be further described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0034] like Figure 1-3 As shown, this sewing machine includes a fabric feeding mechanism 1, a thread cutting mechanism 2, and a presser foot lifting mechanism 3. The sewing machine also includes a motor 4, which is a double-headed motor 4. One end of the output shaft of the motor 4 is equipped with a crank 5 that drives the presser foot 22 to move upward, and the other end of the output shaft of the motor 4 is equipped with a turntable 6 that drives the fabric feeding mechanism 1 to feed fabric and a crank 7 that drives the thread cutting mechanism 2 to cut thread.

[0035] When this sewing machine is working, motor 4 drives turntable 6 to swing back and forth. The swinging turntable 6 drives the fabric feeding mechanism 1 to swing, causing the feed teeth on the fabric feeding mechanism 1 to make elliptical motion, thus feeding the fabric. When it is necessary to cut the thread, motor 4 drives turntable 6 to rotate a larger angle, after which turntable 6 disengages from fabric feeding mechanism 1, and fabric feeding mechanism 1 stops feeding the fabric. Crank 2 drives thread cutting mechanism 2 to cut the thread on the fabric. Motor 4 drives crank 5, which drives presser foot lifting mechanism 3 to swing. Presser foot lifting mechanism 3 drives presser foot 22 to move upward, thus lifting the presser foot. After that, motor 4 continues to rotate. When crank 2 rotates to a certain angle, thread cutting mechanism 2 resets. After motor 4 rotates one revolution, turntable 6 re-engages with fabric feeding mechanism 1, and turntable 6 continues to swing back and forth, driving fabric feeding mechanism 1 to swing, thus continuing to feed the fabric.

[0036] Preferably, motor 4 is a stepper motor.

[0037] like Figure 2 and 4 As shown, in this embodiment, a swing arm 8 is installed on the fabric feeding mechanism 1, and a roller 9 is connected to the swing arm 8. The turntable 6 has a groove 10 on its periphery. When the roller 9 is engaged in the groove 10, the turntable 6 can push the swing arm 8 to swing.

[0038] In this structure, the roller 9 on the swing arm 8 can be engaged in the groove 10 of the turntable 6. When the motor 4 drives the turntable 6 to swing back and forth, the turntable 6 drives the fabric feeding mechanism 1 to swing through the roller 9 and the swing arm 8 to achieve fabric feeding.

[0039] like Figure 2 As shown, in this embodiment, a bracket 11 is installed on one end of the motor 4. The bracket 11 has two oppositely arranged bosses 12. The roller 9 is located between the two bosses 12 and can abut against the bosses 12.

[0040] During fabric feeding, roller 9 swings back and forth between two oppositely arranged bosses 12. The bosses 12 limit the swing angle of roller 9. This structure can limit the swing angle of roller 9 to a suitable range, thereby adjusting the swing amplitude of the feed teeth during fabric feeding. When it is necessary to cut the thread, the motor 4 drives the turntable 6 to rotate at a larger angle. After the turntable 6 rotates, roller 9 abuts against one of the bosses 12. The turntable 6 continues to rotate, and roller 9 stops rotating. Then the turntable 6 disengages from roller 9, and the fabric feeding mechanism 1 stops feeding fabric.

[0041] like Figure 5 As shown, in this embodiment, a bolt 13 is threaded onto the boss 12, and the bolt 13 protrudes from the boss 12. The roller 9 can abut against the bolt or a boss 12.

[0042] In this structure, during fabric feeding, roller 9 oscillates back and forth between a screw and a boss 12. The screw and boss 12 limit the movement of roller 9. By rotating the bolt 13 on one boss 12 and adjusting the relative position of the screw and the other boss 12, the oscillation angle of roller 9 can be adjusted as needed, thereby adjusting the oscillation amplitude of the feed teeth during fabric feeding and improving the smoothness of fabric feeding.

[0043] like Figure 1 As shown, in this embodiment, a crank 14 is installed on the rocker arm 8, and a spring 15 is connected to the outer end of the crank 14 and the bracket 11. The spring 15 is in a stretched state and causes the roller 9 to tend to abut against the periphery of the turntable 6 or the groove 10.

[0044] In this structure, the stretched spring 15 applies a force to the roller 9 through the crank 14. This force keeps the roller 9 abutting against the periphery of the turntable 6 or in the groove 10 of the turntable 6. This structure makes the roller 9 in soft contact with the turntable 6, and the roller 9 is tightly engaged in the groove 10, making it difficult to fall off and ensuring good transmission effect.

[0045] like Figure 2 and 6 As shown, in this embodiment, the wire cutting mechanism 2 includes a swingable irregular ring 16. The irregular ring 16 includes an arc-shaped segment 17, a wire cutting segment 18, and a reset segment 19 connected on one side. A roller 23 is installed on one end of the crank 2 7. The roller 23 is located in the irregular ring 16. When the roller 23 abuts against the wire cutting segment 18, the roller 23 can push the irregular ring 16 to swing.

[0046] Roller 23 is located inside the irregular ring 16. During fabric feeding, roller 23 swings within the arc segment 17. The trajectory of roller 23 is consistent with the extension direction of the arc segment 17. Even when roller 23 contacts the arc segment 17, it does not push the irregular ring 16 to swing. At this time, the thread cutting mechanism 2 does not operate. When thread cutting is required, motor 4 drives turntable 6 to rotate at a larger angle. Roller 9 then rotates with turntable 6 and abuts against a boss 12. Turntable 6 continues to rotate, and roller 9 stops rotating. Afterward, turntable 6 disengages from roller 9, and fabric feeding mechanism 1 stops feeding. At this time, roller 23 swings to the thread cutting segment 18 and abuts against it. The shaped ring 16 is pushed to swing by the cutting segment 18, and the shaped ring 16 drives the cutting mechanism 2 to operate. The cutting mechanism 2 cuts the thread on the fabric. Then the motor 4 continues to rotate. When the second roller 23 moves to the reset section 19, the cutting mechanism 2 begins to reset. After the motor 4 rotates one revolution, the first roller 9 on the swing arm 8 is re-engaged in the groove 10 of the turntable 6. The motor 4 drives the turntable 6 to swing back and forth. The turntable 6 drives the fabric feeding mechanism 1 to swing through the swing arm 8. The fabric feeding mechanism 1 continues to feed the fabric. At this time, the second roller 23 rotates to the arc section 17. The movement trajectory of the second roller 23 is consistent with the extension direction of the arc section 17. At this time, the cutting mechanism 2 does not operate.

[0047] When roller 23 moves to reset section 19, if the wire cutting mechanism 2 does not start to reset, roller 23 will rotate to arc section 17 and push the irregular ring 16 to swing in the opposite direction, so that the wire cutting mechanism 2 will gradually reset until the movement trajectory of roller 23 is consistent with the extension direction of arc section 17, at which point the wire cutting mechanism 2 will not move.

[0048] like Figure 1 and 3 As shown, in this embodiment, a connecting rod 20 is installed on the lifting foot mechanism 3, and a roller 21 is installed on one end of the crank 5. The roller 21 can abut against the connecting rod 20 and push the connecting rod 20 to swing.

[0049] When the motor 4 drives the crank 5 to swing, the crank 5 pushes the connecting rod 20 to swing upward through the roller 21. The connecting rod 20 drives the presser foot 22 to move upward through the presser foot lifting mechanism 3, thereby lifting the presser foot.

[0050] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention 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 the invention or exceeding the scope defined by the appended claims.

Claims

1. A sewing machine, the sewing machine comprising a fabric feeding mechanism (1), a thread cutting mechanism (2), and a presser foot lifting mechanism (3), characterized in that, The sewing machine also includes a motor (4), which is a double-headed motor (4). One end of the output shaft of the motor (4) is equipped with a crank (5) that drives the presser foot (22) to move upward. The other end of the output shaft of the motor (4) is equipped with a turntable (6) that drives the fabric feeding mechanism (1) to feed fabric and a crank (7) that drives the thread cutting mechanism (2) to cut thread. A swing arm (8) is installed on the fabric feeding mechanism (1). A roller (9) is connected to the swing arm (8). The turntable (6) has a groove (10) on its periphery. When the roller (9) is engaged in the groove (10), the turntable (6) can push the swing arm (8) to swing. One end of the motor (4) is equipped with a... The bracket (11) has two opposing bosses (12). The first roller (9) is located between the two bosses (12) and can abut against the bosses (12). The motor (4) drives the turntable (6) to swing back and forth. The swinging turntable (6) drives the feeding mechanism (1) to swing, so that the feeding teeth on the feeding mechanism (1) make elliptical movements to realize the feeding. When it is necessary to cut the thread, the motor (4) drives the turntable (6) to rotate at a larger angle. The first roller (9) abuts against one of the bosses (12) after the turntable (6) rotates. The turntable (6) continues to rotate, and the first roller (9) stops rotating. Then the turntable (6) disengages from the first roller (9), and the feeding mechanism (1) stops feeding.

2. A sewing machine according to claim 1, characterized in that, A bolt (13) is threaded onto the boss (12), and the bolt (13) protrudes from the boss (12). The roller (9) can abut against the bolt or a boss (12).

3. A sewing machine according to claim 1, characterized in that, A crank (14) is mounted on the swing arm (8). A spring (15) is connected to the outer end of the crank (14) and the bracket (11). The spring (15) is in a stretched state and causes the roller (9) to tend to abut against the periphery of the turntable (6) or the groove (10).

4. A sewing machine according to claim 1, characterized in that, The wire-cutting mechanism (2) includes a swingable irregular ring (16), which includes an arc-shaped segment (17), a wire-cutting segment (18), and a reset segment (19) connected on one side. A roller (23) is installed on one end of the crank (7). The roller (23) is located in the irregular ring (16). When the roller (23) abuts against the wire-cutting segment (18), the roller (23) can push the irregular ring (16) to swing.

5. A sewing machine according to claim 1, 2, 3, or 4, characterized in that, A connecting rod (20) is installed on the lifting foot mechanism (3), and a roller (21) is installed on one end of the crank (5). The roller (21) can abut against the connecting rod (20) and push the connecting rod (20) to swing.

6. A sewing machine according to claim 1, 2, 3, or 4, characterized in that, The motor (4) is a stepper motor.

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