CN112981736A

CN112981736A - Sewing machine

Info

Publication number: CN112981736A
Application number: CN201911303708.3A
Authority: CN
Inventors: 何明金; 祝书伟
Original assignee: Jack Sewing Machine Co Ltd
Current assignee: Jack Technology Co Ltd
Priority date: 2019-12-17
Filing date: 2019-12-17
Publication date: 2021-06-18
Anticipated expiration: 2039-12-17
Also published as: CN112981736B

Abstract

The invention provides a sewing machine, and belongs to the technical field of sewing machines. The technical problem that an existing sewing machine cannot conveniently adjust the synchronous relation between cloth feeding and cloth pricking and thread taking-up is solved. The sewing machine comprises a needle bar, a thread take-up lever, an upper shaft capable of driving the needle bar and the thread take-up lever to move and a main motor capable of driving the upper shaft to rotate; the sewing machine also comprises a tooth frame, a driving motor and a feeding eccentric wheel, wherein the driving motor is provided with a driving shaft, the feeding eccentric wheel is connected to the driving shaft of the driving motor, the feeding eccentric wheel is respectively connected with a feeding connecting rod and a feed lifting tooth connecting rod, the feeding connecting rod is connected with a feeding shaft through a feeding transmission component, and the feeding shaft is provided with a tooth frame seat; the feed lifting rock connecting rod is connected with a feed lifting rock shaft through a feed lifting rock crank, and a feed lifting fork is fixedly arranged on the feed lifting rock shaft; the tooth frame is respectively connected with the tooth frame seat and the tooth lifting fork, and the tooth frame is provided with a feeding tooth. The invention separates the feeding eccentric wheel from the upper shaft, is convenient for adjusting the synchronous relation of cloth feeding and cloth pricking and thread picking, and has simple operation.

Description

Sewing machine

Technical Field

The invention belongs to the technical field of sewing machines, and relates to a sewing machine.

Background

The sewing machine is a machine which uses a sewing thread to form a stitch on a sewing material, and interweaves or sews one or more layers of the sewing material.

In the prior art of sewing machines, because only one driving source for feeding and picking the cloth is provided, namely the main motor completes the whole input, the synchronous relationship between the feeding and picking of the cloth is determined after the machine is assembled, and the synchronous relationship is not changed in each period of the operation of the main motor. The synchronous relation between the cloth feeding and the cloth pricking and the yarn taking has great influence on whether the lines are wrinkled or not, when the synchronous relation is adjusted, a feeding eccentric wheel needs to be manually loosened to tighten a screw, a hand wheel needs to be rotated for a certain angle, and then the locking screw is locked.

The sewing machine in the patent literature can realize the adjustment of the synchronous relation between the cloth feeding and the cloth stabbing, but in the process, the rotating angle of the hand wheel is inconvenient to control, the effect is not obviously changed when the rotation is too small, the needle breakage and other problems are easy to occur when the rotation is too large, and the customer experience is seriously influenced.

Disclosure of Invention

The invention provides a sewing machine according to the problems in the prior art, and the technical problems to be solved by the invention are as follows: how to conveniently adjust the synchronous relation of the cloth feeding and the cloth pricking and thread adjusting and simplify the operation process.

The purpose of the invention can be realized by the following technical scheme:

a sewing machine comprises a needle bar, a thread take-up lever, an upper shaft capable of driving the needle bar and the thread take-up lever to move and a main motor capable of driving the upper shaft to rotate; the sewing machine is characterized by further comprising a tooth frame, a driving motor and a feeding eccentric wheel, wherein a driving shaft is arranged on the driving motor, the feeding eccentric wheel is connected to the driving shaft of the driving motor, a feeding connecting rod and a feed lifting tooth connecting rod are respectively connected to the feeding eccentric wheel, the feeding connecting rod is connected with a feeding shaft through a feeding transmission assembly, and a tooth frame seat is arranged on the feeding shaft; the feed lifting tooth connecting rod is connected with a feed lifting tooth shaft through a feed lifting tooth crank, and a feed lifting tooth fork is fixedly arranged on the feed lifting tooth shaft; the tooth frame is respectively connected with the tooth frame seat and the tooth lifting fork, and the tooth frame is provided with feeding teeth.

The working principle is as follows: when the sewing machine is in a sewing mode, the main motor and the synchronous motor operate simultaneously, the main motor drives the upper shaft to rotate, and simultaneously drives the needle rod and the thread take-up rod to complete the cloth-pricking and thread-taking actions; the synchronous motor drives the feeding eccentric wheel to rotate, the feeding eccentric wheel drives the feed lifting tooth connecting rod and the feeding connecting rod to rotate, the feeding connecting rod drives the feeding shaft and the tooth frame base to move through the feeding transmission assembly, the tooth lifting connecting rod drives the tooth lifting shaft and the tooth lifting fork to move through the tooth lifting crank, and the tooth frame base and the tooth lifting fork drive the feeding teeth on the tooth frame connected with the tooth lifting fork to move. When the sewing mode needs to be switched, only the initial angle of the main motor or the driving motor needs to be adjusted. The sewing machine can well complete the work of feeding cloth and picking up threads of the stabbed cloth, and can conveniently change the synchronous relation of the feeding cloth and the stabbed cloth.

In the sewing machine, the two ends of the feeding eccentric wheel are respectively provided with the first eccentric part and the second eccentric part, the first eccentric part and the second eccentric part are arranged in a relatively staggered manner, the feeding connecting rod is connected to the first eccentric part, and the feed lifting connecting rod is connected to the second eccentric part. The feeding eccentric wheel can conveniently drive the feeding connecting rod and the feed lifting connecting rod to move at the same time, and the interference between the feeding connecting rod and the feed lifting connecting rod is avoided.

In the sewing machine, the upper end of the feeding connecting rod is connected to the first eccentric part in a sleeved mode, the lower end of the feeding connecting rod is hinged to the feeding transmission assembly, the feeding crank is fixedly arranged at one end, close to the feeding shaft, of the feeding shaft, and the feeding transmission assembly is hinged to the feeding crank. The feeding transmission component and the feeding crank connect the feeding connecting rod with the feeding shaft, so that the motion of the feeding connecting rod is stably transmitted to the feeding shaft.

In the sewing machine, the upper end of the feed lifting rock connecting rod is sleeved and connected with the second eccentric part, the feed lifting rock crank is fixedly locked at a position close to one end of the feed lifting rock shaft, and the lower end of the feed lifting rock connecting rod is hinged with the outer end of the feed lifting rock crank. The feed lifting crank connects the feed lifting connecting rod with the feed lifting shaft, so that the motion of the feed lifting connecting rod is stably transmitted to the feed lifting shaft.

In the sewing machine, the feed dog seat is fixedly arranged at the position, close to the other end, of the feed shaft, and the feed dog fork is fixedly arranged at the position, close to the other end, of the feed shaft; one end of the tooth frame is hinged with the tooth frame seat, the other end of the tooth frame is hinged with the tooth lifting fork, and the feeding tooth is fixedly arranged on the upper side of the tooth frame. The feed lifting fork is connected with the tooth rack seat through the tooth rack, and the feed teeth are fixedly arranged on the tooth rack, so that the stable work of the feed teeth can be ensured.

In the above sewing machine, the sewing machine further comprises a housing, and the main motor and the driving motor are fixedly arranged on the housing; the main motor is arranged at one end of the upper shaft, an output shaft of the main motor is fixedly connected with the end part of the upper shaft, the upper shaft and a driving shaft of the driving motor are arranged in parallel at intervals, and the driving shaft is positioned below the upper shaft. The main motor drives the upper shaft to rotate through the output shaft, the upper shaft and the driving shaft on the driving motor are arranged in parallel at intervals and do not interfere with each other, and the needle rod, the thread take-up rod and the tooth rack can work synchronously.

In the sewing machine, the driving shaft of the driving motor and the output shaft of the driving motor are of an integral structure. The output shaft is the driving shaft, so that the driving motor can drive the feeding eccentric wheel to rotate.

Compared with the prior art, the invention can realize the respective control of feeding and cloth pricking and thread picking by separating the feeding eccentric wheel from the upper shaft and driving the feeding eccentric wheel to rotate by arranging the driving motor, and can change the synchronous relation of the main motor and the driving motor by changing the angles of the main motor and the driving motor.

Drawings

Fig. 1 is a schematic perspective view of the sewing machine.

Fig. 2 is a schematic perspective view of the feed drive assembly.

Fig. 3 is a schematic perspective view of the second embodiment of the present sewing machine.

In the figure, 1, a needle bar; 2. a take-up lever; 3. an upper shaft; 4. a main motor; 5. a dental articulator; 6. a drive motor; 7. a feeding eccentric wheel; 71. a first eccentric part; 72. a second eccentric part; 8. a drive shaft; 9. a feeding connecting rod; 10. a feed lifting connecting rod; 11. a feeding transmission assembly; 111. a feeding swing plate seat; 112. feeding a short swing plate; 113. feeding a long swing plate; 114. feeding swing plate seat pins; 12. a feed shaft; 13. a dental articulator mount; 14. a feed lifting crank; 15. a feed lifting shaft; 16. a feed lifting fork; 17. feeding teeth; 18. a feeding crank; 19. and an output shaft.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the accompanying drawings, but the present invention is not limited to the following embodiments.

As shown in fig. 1 and 3, the sewing machine comprises a needle bar 1, a thread take-up lever 2, an upper shaft 3 capable of driving the needle bar 1 and the thread take-up lever 2 to move, and a main motor 4 capable of driving the upper shaft 3 to rotate; the sewing machine also comprises a tooth frame 5, a driving motor 6 and a feeding eccentric wheel 7, wherein the driving motor 6 is provided with a driving shaft 8, the feeding eccentric wheel 7 is connected to the driving shaft 8 of the driving motor 6, the feeding eccentric wheel 7 is respectively connected with a feeding connecting rod 9 and a lifting tooth connecting rod 10, the feeding connecting rod 9 is connected with a feeding shaft 12 through a feeding transmission component 11, and the feeding shaft 12 is provided with a tooth frame seat 13; the feed lifting rock connecting rod 10 is connected with a feed lifting rock shaft 15 through a feed lifting rock crank 14, and a feed lifting fork 16 is fixedly arranged on the feed lifting rock shaft 15; the tooth frame 5 is respectively connected with the tooth frame base 13 and the tooth lifting fork 16, and the tooth frame 5 is provided with a feeding tooth 17. Two ends of the feeding eccentric wheel 7 are respectively provided with a first eccentric part 71 and a second eccentric part 72, the first eccentric part 71 and the second eccentric part 72 are arranged in a relative staggered mode, the feeding connecting rod 9 is connected to the first eccentric part 71, and the feed lifting connecting rod 10 is connected to the second eccentric part 72. The sewing machine also comprises a machine shell, and the main motor 4 and the driving motor 6 are fixedly arranged on the machine shell; the main motor 4 is arranged at one end of the upper shaft 3, an output shaft 19 of the main motor 4 is fixedly connected with the end part of the upper shaft 3, the upper shaft 3 and a driving shaft 8 of the driving motor 6 are arranged in parallel at intervals, and the driving shaft 8 is positioned below the upper shaft 3. The driving shaft 8 on the driving motor 6 and the output shaft of the driving motor 6 are of an integral structure. The main motor 4 and the driving motor 6 are started, the main motor 4 drives the upper shaft 3 to move through the output shaft 19 on the main motor, and the upper shaft 3 drives the needle rod 1 and the thread take-up lever 2 to move up and down; the driving motor 6 drives the feeding eccentric wheel 7 to rotate through the driving shaft 8 on the driving motor, the eccentric part I71 on the feeding eccentric wheel 7 drives the feeding connecting rod 9 to move, and the feeding connecting rod drives the feeding shaft 12 and the tooth rack seat 13 to move through the feeding transmission component 11; the second eccentric part 72 on the feeding eccentric wheel 7 drives the feed lifting tooth connecting rod 10 to move, and the feed lifting tooth connecting rod 10 drives the feed lifting tooth shaft 15 and the feed lifting tooth fork 16 to move through the feed lifting tooth crank 14; the tooth frame base 13 and the tooth lifting fork 16 drive the tooth frame 5 connected with the tooth frame base to move, and the tooth frame 5 drives the feeding teeth 17 arranged on the tooth frame base to move. The sewing machine can simultaneously carry out the work of feeding cloth and picking up threads of the cloth.

Further, as shown in fig. 2, the upper end of the feeding connecting rod 9 is sleeved and connected to the first eccentric portion 71, the lower end of the feeding connecting rod 9 is hinged to the feeding transmission assembly 11, the feeding crank 18 is fixedly arranged at one end, close to the feeding shaft 12, of the feeding shaft, and the feeding transmission assembly 11 is hinged to the feeding crank 18. The feeding transmission component 11 comprises a feeding swing plate seat 111, a feeding short swing plate 112, a feeding long swing plate 113 and a feeding swing seat pin 114, wherein the number of the feeding short swing plate 112 and the number of the feeding long swing plate 113 are two, and the two feeding short swing plates 112 and the two feeding long swing plates 113 are distributed on two sides of the lower end of the feeding connecting rod 9, the feeding short swing plate 112 and the feeding long swing plate 113 are all arranged in a groove of the feeding swing plate seat 111, one ends of the feeding swing plate seat 111, the feeding short swing plate 112 and the feeding long swing plate 113 are connected with the lower end of the feeding connecting rod 9 through the feeding swing seat pin 114, and the other end of the feeding long swing plate. The lower end of the feeding connecting rod 9 drives the feeding swing seat pin 114 and the feeding long swing plate 113 to move, and the feeding long swing plate 113 drives the feeding shaft 12 to move through the feeding crank 18. It is achieved that the movement of the feed link 9 is transmitted to the feed shaft 12.

Further, as shown in fig. 3, the upper end of the feed lifting rock connecting rod 10 is sleeved and connected to the second eccentric part 72, the feed lifting rock crank 14 is fixedly locked at a position close to one end of the feed lifting rock shaft 15, and the lower end of the feed lifting rock connecting rod 10 is hinged to the outer end of the feed lifting rock crank 14. One end of a feed lifting rock shaft crank 14 is locked with the feed lifting rock shaft 15, the other end of the feed lifting rock shaft crank is hinged with the lower end of a feed lifting rock connecting rod 10, and the lower end of the feed lifting rock connecting rod 10 drives the feed lifting rock shaft 14 to rotate through the feed lifting rock shaft crank 14. The motion of the feed dog connecting rod 10 is transmitted to the feed dog shaft 14.

Further, as shown in fig. 3, the feed shaft 12 is fixedly arranged at a position close to the other end of the feed shaft 13, and the feed lifting fork 16 is fixedly arranged at a position close to the other end of the feed lifting shaft 15; one end of the tooth frame 5 is hinged with the tooth frame seat 13, the other end of the tooth frame 5 is hinged with the tooth lifting fork 16, and the feeding tooth 17 is fixedly arranged on the upper side of the tooth frame 5. The feed lifting fork 16 and the feed rack seat 13 are connected with two ends of the feed rack 5 to drive the feed rack 5 to move, and the feed rack 5 drives the feed dog 17 on the feed rack to move, so that the purpose of feeding cloth is achieved.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.

Although more 1, needle bar is used herein; 2. a take-up lever; 3. an upper shaft; 4. a main motor; 5. a dental articulator; 6. a drive motor; 7. a feeding eccentric wheel; 71. a first eccentric part; 72. a second eccentric part; 8. a drive shaft; 9. a feeding connecting rod; 10. a feed lifting connecting rod; 11. a feeding transmission assembly; 111. a feeding swing plate seat; 112. feeding a short swing plate; 113. feeding a long swing plate; 114. feeding swing plate seat pins; 12. a feed shaft; 13. a dental articulator mount; 14. a feed lifting crank; 15. a feed lifting shaft; 16. a feed lifting fork; 17. feeding teeth; 18. a feeding crank; 19. output shaft, etc., without excluding the possibility of using other terms. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any one of the additional limitations that fall within the spirit of the present invention.

Claims

1. A sewing machine comprises a needle bar (1), a thread take-up lever (2), an upper shaft (3) capable of driving the needle bar (1) and the thread take-up lever (2) to move and a main motor (4) capable of driving the upper shaft (3) to rotate; the sewing machine is characterized by further comprising a tooth frame (5), a driving motor (6) and a feeding eccentric wheel (7), wherein a driving shaft (8) is arranged on the driving motor (6), the feeding eccentric wheel (7) is connected to the driving shaft (8) of the driving motor (6), a feeding connecting rod (9) and a tooth lifting connecting rod (10) are respectively connected to the feeding eccentric wheel (7), the feeding connecting rod (9) is connected with a feeding shaft (12) through a feeding transmission component (11), and a tooth frame seat (13) is arranged on the feeding shaft (12); the feed lifting rock connecting rod (10) is connected with a feed lifting rock shaft (15) through a feed lifting rock crank (14), and a feed lifting fork (16) is fixedly arranged on the feed lifting rock shaft (15); the tooth frame (5) is respectively connected with the tooth frame seat (13) and the tooth lifting fork (16), and the tooth frame (5) is provided with a feeding tooth (17).

2. The sewing machine according to claim 1, characterized in that the two ends of the feed eccentric (7) are respectively provided with a first eccentric part (71) and a second eccentric part (72), the first eccentric part (71) and the second eccentric part (72) are arranged in a staggered manner, the feed connecting rod (9) is connected to the first eccentric part (71), and the feed lifting connecting rod (10) is connected to the second eccentric part (72).

3. The sewing machine according to claim 2, characterized in that the upper end of the feeding connecting rod (9) is sleeved and connected to the first eccentric part (71), the lower end of the feeding connecting rod (9) is hinged to the feeding transmission component (11), a feeding crank (18) is fixedly arranged at one end, close to the feeding shaft (12), of the feeding shaft, and the feeding transmission component (11) is hinged to the feeding crank (18).

4. The sewing machine of claim 3, wherein the upper end of the feed lifting rock connecting rod (10) is sleeved and connected to the second eccentric part (72), the feed lifting rock crank (14) is fixedly locked at a position close to one end of the feed lifting rock shaft (15), and the lower end of the feed lifting rock connecting rod (10) is hinged with the outer end of the feed lifting rock crank (14).

5. The sewing machine according to claim 4, wherein the gripper base (13) is fixed to the feed shaft (12) near the other end, and the gripper fork (16) is fixed to the gripper shaft (15) near the other end; one end of the tooth rack (5) is hinged with the tooth rack seat (13), the other end of the tooth rack (5) is hinged with the tooth lifting fork (16), and the feeding tooth (17) is fixedly arranged on the upper side of the tooth rack (5).

6. Sewing machine as in any claim from 1 to 5, characterized in that it further comprises a machine housing on which said main motor (4) and drive motor (6) are fixed; the main motor (4) is arranged at one end of the upper shaft (3), an output shaft (19) of the main motor (4) is fixedly connected with the end part of the upper shaft (3), the upper shaft (3) and a driving shaft (8) of the driving motor (6) are arranged in parallel at intervals, and the driving shaft (8) is positioned below the upper shaft (3).

7. Sewing machine as in claim 6, characterized in that the drive shaft (8) on the drive motor (6) is of one piece construction with the output shaft of the drive motor (6).