阅读说明：本技术 一种缝纫机的剪线抬压脚装置 (Presser foot device is lifted to sewing machine's trimming ) 是由 卢律何 于 2020-05-08 设计创作，主要内容包括：本发明提供了一种缝纫机的剪线抬压脚装置,属于缝纫机技术领域。它解决了现有噪音较大、工人费力、效率低等技术问题。一种缝纫机的剪线抬压脚装置,缝纫机包括架体,剪线抬压脚装置固定在架体上,剪线抬压脚装置包括：电动驱动组件,电动驱动组件包括驱动轴,驱动轴两端分别为第一输出端和第二输出端,第一输出端固定有第一不完全齿轮,第二输出端固定有凸轮结构,凸轮结构具有弧形的驱动轮廓面；传动件,传动件具有第一曲柄和第二曲柄,第一曲柄与驱动轮廓面抵靠,在凸轮结构转动时,第一曲柄沿着驱动轮廓面移动并使第二曲柄进行转动。本发明具有噪音小、工人省力的优点。(The invention provides a thread trimming and presser foot lifting device of a sewing machine, and belongs to the technical field of sewing machines. It has solved the great, workman of current noise is hard, inefficiency scheduling technical problem. The utility model provides a presser foot device is lifted to sewing machine's trimming, sewing machine includes the support body, and the trimming is lifted the presser foot device and is fixed on the support body, and the trimming is lifted the presser foot device and is included: the electric driving assembly comprises a driving shaft, a first output end and a second output end are respectively arranged at two ends of the driving shaft, a first incomplete gear is fixed at the first output end, a cam structure is fixed at the second output end, and the cam structure is provided with an arc-shaped driving contour surface; the driving medium, the driving medium has first crank and second crank, and first crank supports with the drive profile face and leans on, and when the cam structure rotated, first crank removed along the drive profile face and made the second crank rotate. The invention has the advantages of low noise and labor saving for workers.)

1. A trimming and presser foot lifting device of a sewing machine, the sewing machine comprises a frame body, the trimming and presser foot lifting device is fixed on the frame body, and is characterized in that,

the trimming and presser foot lifting device comprises:

the driving assembly comprises a driving shaft, a first output end and a second output end are respectively arranged at two ends of the driving shaft, a first incomplete gear is fixed at the first output end, a cam structure is fixed at the second output end, and the cam structure is provided with an arc-shaped driving contour surface;

a drive member having a first crank and a second crank, the first crank abutting the drive profile surface, the first crank moving along the drive profile surface and rotating the second crank when the cam structure rotates;

the presser foot lifting device comprises a transmission assembly and a presser foot assembly, one end of the transmission assembly is in transmission connection with the presser foot assembly, the other end of the transmission assembly is connected with the second crank, and when the second crank rotates to lift the transmission assembly, the transmission assembly drives the presser foot assembly to perform lifting action; and

the thread trimming device comprises a thread trimming executing component, a rotating shaft and a second incomplete gear, wherein the thread trimming executing component is fixed at one end of the rotating shaft, the second incomplete gear is fixed at the other end of the rotating shaft, when the first incomplete gear rotates to a position where the first incomplete gear is meshed with the second incomplete gear and continues to be meshed and rotate, the second incomplete gear drives the thread trimming executing component to perform thread trimming;

wherein the presser foot lifting device and the thread trimming device do not work synchronously.

2. The thread trimming and presser foot lifting device of claim 1, wherein the driving member is a driving motor, and the driving shaft is an output shaft of the driving motor.

3. The thread trimming and presser foot lifting device of claim 1, wherein the driving assembly further comprises a driving member, and an output shaft of the driving member is in transmission connection with the driving shaft and can drive the driving shaft to rotate.

4. The thread trimming and foot lifting device of claim 1, wherein the first crank is rotatably provided with a wheel, the wheel abutting the driving contour surface.

5. The trimming and presser foot lifting device of sewing machine according to claim 1, wherein a positioning groove is provided on the second crank, and one end of the transmission member extends into the positioning groove from top to bottom and can swing in the positioning groove.

6. The thread trimming presser foot lifting apparatus of claim 1 wherein said thread trimming actuator assembly has a braking interference surface.

7. The thread trimming and presser foot lifting device of claim 1, wherein an oil pan is fixed to a lower portion of the frame body, and the oil pan has a through hole for one end of the transmission assembly to pass through.

8. The trimming and presser foot lifting device of claim 7, wherein a torsion spring is sleeved on the transmission member, one end of the torsion spring abuts against the first crank, the other end of the torsion spring abuts against the oil pan, and the torsion spring keeps the first crank abutting against the driving contour surface of the cam structure.

Technical Field

The invention belongs to the technical field of sewing machines, and particularly relates to a thread trimming and presser foot lifting device of a sewing machine.

Background

When the existing sewing machine is used, when the sewing machine performs a thread cutting action and a presser foot lifting action, relatively large noise can be generated, and negative effects are generated on the sewing working environment. Meanwhile, the lifting height of the pressure foot cannot be freely controlled, and workers are hard to use.

Disclosure of Invention

The invention aims to solve the problems in the prior art, provides a thread cutting and presser foot lifting device of a sewing machine, and solves the problems of high noise and labor waste of workers.

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

a trimming and presser foot lifting device of a sewing machine, the sewing machine comprises a frame body, the trimming and presser foot lifting device is fixed on the frame body, and is characterized in that,

the trimming and presser foot lifting device comprises:

the electric driving assembly comprises a driving shaft, a first output end and a second output end are respectively arranged at two ends of the driving shaft, a first incomplete gear is fixed at the first output end, a cam structure is fixed at the second output end, and the cam structure is provided with an arc-shaped driving contour surface;

a drive member having a first crank and a second crank, the first crank abutting the drive profile surface, the first crank moving along the drive profile surface and rotating the second crank when the cam structure rotates;

the presser foot lifting device comprises a transmission assembly and a presser foot assembly, one end of the transmission assembly is in transmission connection with the presser foot assembly, the other end of the transmission assembly is connected with the second crank, and when the second crank rotates to lift the transmission assembly, the transmission assembly drives the presser foot assembly to perform lifting action; and

the thread trimming device comprises a thread trimming executing component, a rotating shaft and a second incomplete gear, wherein the thread trimming executing component is fixed at one end of the rotating shaft, the second incomplete gear is fixed at the other end of the rotating shaft, when the first incomplete gear rotates to a position where the first incomplete gear is meshed with the second incomplete gear and continues to be meshed and rotate, the second incomplete gear drives the thread trimming executing component to perform thread trimming;

wherein the presser foot lifting device and the thread trimming device do not work synchronously.

In the thread trimming and presser foot lifting device of the sewing machine, the electric driving component is a driving motor, and the driving shaft is an output shaft of the driving motor.

In the thread trimming and presser foot lifting device of the sewing machine, the electric driving assembly further comprises a driving piece, and an output shaft of the driving piece is in transmission connection with the driving shaft and can drive the driving shaft to rotate.

In the thread trimming and presser foot lifting device of the sewing machine, the first crank is rotatably provided with a rotating wheel, and the rotating wheel is abutted against the driving contour surface.

In the thread trimming and presser foot lifting device of the sewing machine, the second crank is provided with a positioning groove, and one end of the transmission assembly extends into the positioning groove from top to bottom and can swing in the positioning groove.

In the thread trimming and presser foot lifting device of the sewing machine, the thread trimming executing assembly is provided with a braking abutting surface.

In the thread trimming and presser foot lifting device of the sewing machine, an oil disc is fixed at the lower part of the frame body, and a through hole for one end of the transmission assembly to penetrate is formed in the oil disc.

In the trimming presser foot lifting device of the sewing machine, the transmission part is sleeved with a torsional spring, one end of the torsional spring is abutted to the first crank, the other end of the torsional spring is abutted to the oil disc, and the torsional spring enables the first crank to be kept abutted to the driving contour surface of the cam structure.

Compared with the prior art, the invention has the following advantages:

1. the lifting height is controlled by the rotation angle of the driving shaft, the driving shaft rotates in the electric driving assembly, the wire shearing action and the foot lifting action are completed, the problem of labor waste is solved, and the rotation angle of the driving shaft can be controlled through the electric driving assembly. The tradition is stopped through striking after the torsional spring resets with higher speed, can produce great impact force and produce great noise, and the wearing and tearing of part reduce the life-span of whole equipment with higher speed simultaneously, and this device is through the stable rotation and the control turned angle of electric drive assembly drive shaft, avoids the striking, and fundamentally has solved the problem.

2. The common tooth lifting foot structure is driven by the electromagnet, the electromagnet is pushed to the bottom in a working state, the height of the tooth lifting foot reaches the highest height, the effect of adjusting the height of the tooth lifting foot cannot be realized, and meanwhile, the electromagnet generates large impact in a high suction state and generates large negative effects on noise and vibration of the whole machine. In the device, the electric driving assembly drives the driving shaft to rotate, the rotating angle and the rotating speed of the driving shaft are controlled, the lifting height of the presser foot assembly can be effectively controlled, meanwhile, the impact type reset can be avoided, and the service life of parts is prolonged.

Drawings

FIG. 1 is a schematic of the present invention.

Fig. 2 is a schematic view of the present invention after the shelf body is disassembled.

Fig. 3 is a schematic view of the thread trimming apparatus of the present invention.

Fig. 4 is a schematic view of the presser foot lifting device of the present invention.

Fig. 5 is a schematic view of an oil cartridge according to the present invention.

Fig. 6 is a schematic view of the first incomplete gear and the second incomplete gear in a non-meshed state in the present invention.

In the figure, 1, a frame body; 2. an electric drive assembly; 2a, a first output end; 2b, a second output end; 3. a first incomplete gear; 4. a cam structure; 4a, driving a contour surface; 4b, a limiting surface; 5. a transmission member; 5a, a first crank; 5b, a second crank; 5b1, positioning groove; 6. a transmission assembly; 6a, a first shaft pin; 6b, a second shaft pin; 6c, a presser foot ejector rod; 6d, a transmission rod; 6e, a first rotating sheet; 6f, a second rotating sheet; 7. a presser foot assembly; 8. a thread trimming device; 8a, a trimming executing component; 8b, a rotating shaft; 8c, a second incomplete gear; 9. a rotating wheel; 10. an oil pan; 10a, a through hole; 11. a torsion spring.

Detailed Description

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

As shown in fig. 1 to 6, a trimming and presser foot lifting device of a sewing machine, the sewing machine includes a frame body 1, the trimming and presser foot lifting device is fixed on the frame body 1, and the trimming and presser foot lifting device includes: the electric driving assembly 2 comprises a driving shaft, a first output end 2a and a second output end 2b are respectively arranged at two ends of the driving shaft, the first output end 2a is fixedly provided with a first incomplete gear 3, the second output end 2b is fixedly provided with a cam structure 4, and the cam structure 4 is provided with an arc-shaped driving contour surface 4 a; the transmission piece 5 is provided with a first crank 5a and a second crank 5b, wherein in a non-working state, the upper surface of the second crank 5b is in a horizontal state, and the first crank 5a is in a vertical state; the first crank 5a abuts against the driving contour surface 4a, and when the cam structure 4 rotates, the first crank 5a moves along the driving contour surface 4a and rotates the second crank 5 b; the presser foot lifting device comprises a transmission component 6 and a presser foot component 7, one end of the transmission component 6 is in transmission connection with the presser foot component 7, the other end of the transmission component 6 is connected with the second crank 5b, and when the second crank 5b rotates to lift the transmission component 6, the transmission component 6 drives the presser foot component 7 to perform lifting action; the thread trimming device 8 comprises a thread trimming executing component 8a, a rotating shaft 8b and a second incomplete gear 8c, the thread trimming executing component 8a is fixed at one end of the rotating shaft 8b, the second incomplete gear 8c is fixed at the other end of the rotating shaft 8b, when the first incomplete gear 3 rotates to a position where the first incomplete gear is meshed with the second incomplete gear 8c and continues to be meshed and rotates, the second incomplete gear drives the thread trimming executing component 8a to perform thread trimming; wherein the presser foot lifting device and the thread trimming device 8 do not work synchronously.

The working principle of the invention is as follows: when the thread cutting is needed, the driving shaft rotates anticlockwise, the first incomplete gear 3 rotates to the position where the first incomplete gear is meshed with the second incomplete gear 8c and continues to be meshed and rotate, the second incomplete gear 8c drives the thread cutting executing component 8a to perform thread cutting, after the thread cutting is finished, the driving shaft rotates clockwise, the first incomplete gear 3 drives the original path of the second incomplete gear 8c to reset and reach the starting point of the thread cutting, and then the first incomplete gear 3 is disengaged from the second incomplete gear 8 c; in this process, the cam structure 4 is in a non-contact state with the first crank 5 a.

When the foot is lifted, the driving shaft rotates clockwise, the cam structure 4 rotates and drives the transmission piece 5 to rotate through the driving contour surface 4a, the first crank 5a is contacted with the driving contour surface 4a and gradually moves along the driving contour surface 4a when the driving contour surface 4a moves, the first crank 5a moves from the position close to the center of the cam structure 4 to the position close to the outer side, at the moment, the first crank 5a rotates and drives the second crank 5b at the other end of the transmission piece 5 to rotate, the second crank 5b drives one end of the transmission assembly 6 to lift up and drives the presser foot assembly 7 to lift up through the transmission assembly 6, and after the foot is lifted, the first crank 5a returns to the initial position along the original path of the driving contour surface 4a through the counterclockwise rotation of the driving shaft; in this process, the first incomplete gear 3 and the second incomplete gear 8c are in a non-meshed state.

The height of lifting up is controlled by the rotation angle of the driving shaft, the driving shaft rotates in the electric driving assembly 2, the thread cutting action and the foot lifting action are completed, the problem of labor waste is solved, and the rotation angle of the driving shaft can be controlled through the electric driving assembly 2. The tradition is stopped through striking after the torsional spring 11 resets with higher speed, can produce great impact force and produce great noise, and the wearing and tearing of part reduce the life-span of whole equipment with higher speed simultaneously, and this device is through the stable rotation and the control turned angle of electric drive assembly 2 drive shaft, avoids the striking, and fundamentally has solved the problem.

The existing common tooth lifting foot structure is driven by an electromagnet, the electromagnet is pushed to the bottom in a working state, the height of the tooth lifting foot reaches the highest height, the effect of adjusting the height of the tooth lifting foot cannot be realized, and meanwhile, the electromagnet generates large impact in a high suction state and generates large negative effects on noise and vibration of the whole machine. In the device, the electric driving assembly 2 drives the driving shaft to rotate, the rotating angle and the rotating speed of the driving shaft are controlled, the lifting height of the presser foot assembly 7 can be effectively controlled, impact type resetting can be avoided, and the service life of parts is prolonged.

Specifically, the cam structure 4 has a stopper surface 4b, and the stopper surface 4b is opposite to the driving contour surface 4 a.

Specifically, the transmission assembly 6 comprises a first shaft pin 6a, a second shaft pin 6b, a presser foot ejector rod 6c, a transmission rod 6d, a first rotating sheet 6e and a second rotating sheet 6f, the first shaft pin 6a and the second shaft pin 6b are fixed on the frame body 1, the middle part of the first rotating sheet 6e is rotatably connected with the first shaft pin 6a, the middle part of the second rotating sheet 6f is rotatably connected with the second shaft pin 6b, the presser foot ejector rod 6c is rotatably connected on the first rotating sheet 6e, the other end of the presser foot ejector rod 6c abuts against the upper end of the second crank 5b, one end of the transmission rod 6d is rotatably connected with the other end of the first rotating sheet 6e, the other end of the transmission rod 6d is rotatably connected with one end of the second rotating sheet 6f, and the presser foot assembly 7 is connected to the other. When the presser foot ejector rod 6c is driven by the second crank 5b to move upwards, the presser foot assembly 7 is driven to move upwards through the first rotating sheet 6e, the transmission rod 6d and the second rotating sheet 6f, the process is not explained in detail, the traditional existing structure is adopted, and the connection mode of the presser foot assembly 7 and the second rotating sheet 6f is not explained in detail, and the traditional existing structure is adopted.

Specifically, the electric drive assembly 2 is a drive motor, and the drive shaft is an output shaft of the drive motor.

Specifically, the electric driving assembly 2 further comprises a driving member, and an output shaft of the driving member is in transmission connection with the driving shaft and can drive the driving shaft to rotate. The driving part can also be a driving motor, a first gear is fixed on an output shaft of the driving motor, a second gear is fixed on a driving shaft, the first gear is meshed with the second gear, and the driving part can also be driven to rotate by adopting a belt pulley and a chain.

In particular, the first crank 5a is rotatably provided with a runner 9, the runner 9 being in abutment with the driving contour surface 4 a. The runner 9 can avoid direct frictional contact with the driving contour surface 4a, causing friction against the driving contour surface 4a, and thus causing noise.

Specifically, the second crank 5b is provided with a positioning groove 5b1, and one end of the transmission assembly 6 extends into the positioning groove 5b1 from top to bottom and can swing in the positioning groove 5b 1. The presser foot bar 6c in the driving assembly 6 can extend into the positioning groove 5b1, and the position of the presser foot bar 6c in the positioning groove 5b1 changes when the second crank 5b rotates. The side wall of the positioning groove 5b1 has a chamfer.

Specifically, the thread trimming actuating member 8a has a braking interference surface. The support body 1 is provided with a limiting block, the braking abutting surface is directly abutted against the limiting block, the wire cutting execution assembly 8a is always in a contact abutting state in the rotating process, and the wire cutting execution assembly 8a keeps in a static state when the driving shaft is not driven to rotate.

Specifically, an oil pan 10 is fixed to the lower portion of the frame body 1, and the oil pan 10 has a through hole 10a through which one end of the transmission assembly 6 is inserted. The oil pan 10 is used for supplying oil to the whole equipment, and the presser foot mandril 6c in the transmission assembly 6 passes through the through hole 10a, and the through hole 10a plays a role in limiting when the presser foot mandril moves up and down.

Specifically, the transmission member 5 is sleeved with a torsion spring 11, one end of the torsion spring 11 abuts against the first crank 5a, the other end of the torsion spring 11 abuts against the oil pan 10, and the torsion spring 11 keeps the first crank 5a abutting against the driving contour surface 4a of the cam structure 4.

The above components are all standard components or components known to those skilled in the art, and the structure and principle thereof can be known to those skilled in the art through technical manuals or through routine experiments.

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.