CN212505335U

CN212505335U - Automatic thread trimming and presser foot lifting control device of sewing machine

Info

Publication number: CN212505335U
Application number: CN202020831956.7U
Authority: CN
Inventors: 黄为
Original assignee: Taizhou Hongsheng Electronic Co ltd
Current assignee: Taizhou Hongsheng Electronic Co ltd
Priority date: 2020-05-18
Filing date: 2020-05-18
Publication date: 2021-02-09
Anticipated expiration: 2030-05-18

Abstract

The utility model relates to an automatic trimming of sewing machine and lift presser foot controlling means, include driving motor, motor mount pad, trimming drive mechanism and lift presser foot drive mechanism, driving motor fixes on the motor mount pad, and the motor mount pad links firmly its characterized in that with the sewing machine body: the output shaft of the driving motor is respectively sleeved with a presser foot lifting driving part and a thread cutting driving part, the thread cutting driving part is connected with a thread cutting transmission mechanism through a thread cutting driving rod, the presser foot lifting driving part is connected with the presser foot lifting transmission mechanism through a presser foot lifting lever, and the driving motor is connected with a sewing machine controller circuit; the utility model adopts the stepping motor with the encoder to carry out closed-loop control; the advantages are that: 1. reliability is improved, and the out-of-step risk is thoroughly solved; 2. the system has the advantages of quick response, high-speed positioning and better accurate control of the position; 3. the smoothness can be greatly improved, and the power consumption and the inherent vibration are reduced; 4. high torque output, high resolution, no differential feedback.

Description

Automatic thread trimming and presser foot lifting control device of sewing machine

Technical Field

The utility model relates to a sewing machine technical field, concretely relates to automatic trimming of sewing machine and lift presser foot controlling means.

Background

The automatic thread trimming and presser foot lifting device of the existing sewing machine is split, the automatic thread trimming is realized by pushing thread trimming and resetting by an electromagnet or an air cylinder, the presser foot lifting is realized by driving the presser foot by another set of electromagnet or air cylinder in the same way, and the original driving source has the defects of complex installation and processing difficulty, high noise, instability and the like. At present, stepping motors are adopted in the market as driving sources, open-loop control is adopted, and the defects of step loss, low precision, high power consumption, large vibration and the like exist.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects in the prior art, the utility model aims to provide an automatic thread trimming and presser foot lifting control device of a sewing machine, wherein a stepping motor drives a thread trimming and presser foot lifting mechanism to stably operate; in order to solve the problems of the open-loop stepping motor, the utility model adopts the stepping motor with the encoder to carry out closed-loop control; the advantages are that: 1. reliability is improved, and the out-of-step risk is thoroughly solved; 2. the system has the advantages of quick response, high-speed positioning and better accurate control of the position; 3. the smoothness can be greatly improved, and the power consumption and the inherent vibration are reduced; 4. high torque output, high resolution, no differential feedback.

The technical scheme is adopted for realizing the purpose:

the utility model provides an automatic trimming of sewing machine with lift presser foot controlling means, includes driving motor, motor mount pad, trimming drive mechanism and lifts presser foot drive mechanism, and driving motor fixes on the motor mount pad, and the motor mount pad links firmly its characterized in that with the sewing machine body: the output shaft of the driving motor is respectively sleeved with a presser foot lifting driving part and a thread cutting driving part, the thread cutting driving part is connected with a thread cutting transmission mechanism through a thread cutting driving rod, the presser foot lifting driving part is connected with the presser foot lifting transmission mechanism through a presser foot lifting lever, and the driving motor is connected with a sewing machine controller circuit.

The motor mount pad on be provided with the guide holder of trimming actuating lever, the trimming actuating lever passes the guiding hole on the guide holder, the output and the reset seat swing joint of trimming drive division, the reset seat links firmly on the trimming actuating lever, the trimming actuating lever sheathes in and is equipped with reset spring, reset spring one end pushes up on the reset seat, the other end pushes up on the guide holder, the wherein one end and the trimming drive mechanism of trimming actuating lever are connected.

The other end of the thread trimming driving rod is connected with the thread loosening driving rod.

The trimming driving part is a rocker arm which is sleeved on an output shaft of the driving motor, a shifting fork is arranged at the free end of the rocker arm, and a convex column is arranged on the reset seat and matched with the shifting fork.

The two corners of the shifting fork are of a long structure and a short structure; the left and right movement track of the convex column is within the range of the end part circular track of the long angle, and the convex column is positioned outside the range of the end part circular track of the short angle at the original position under the action of the return spring.

The presser foot lifting driving part is a presser foot lifting cam, the presser foot lifting cam is connected with the presser foot lifting transmission mechanism through a presser foot lifting lever, the presser foot lifting lever is pivoted on the sewing machine body, the input end of the presser foot lifting lever is pivoted with a roller, and the roller is matched with the outer edge of the presser foot lifting cam.

The sewing machine comprises a sewing machine body, a motor mounting seat, a thread cutting transmission mechanism and a presser foot lifting transmission mechanism, wherein the motor mounting seat is fixed at the back of the sewing machine body, the sewing machine body comprises a machine head and a machine base, the thread cutting transmission mechanism is arranged in the machine base, and the presser foot lifting transmission mechanism is arranged in the machine head.

The rotating shaft of the driving motor is further sleeved with a grating sheet mounting seat and a grating sheet, an encoder is further fixed on the position, corresponding to the grating sheet, of the end portion of the shell of the driving motor, and the encoder is connected with a controller circuit of the sewing machine.

The utility model controls the driving motor to rotate positively or negatively by the sewing machine controller, when the driving motor rotates positively, the rocker arm drives the trimming driving rod to do linear motion so as to realize trimming action, at the moment, the presser foot lifting cam is a non-driving part and is matched with the roller, and the presser foot lifting lever can not act; when the driving motor rotates forwards, the driving part of the presser foot lifting cam is matched with the roller, and the presser foot lifting lever rotates to realize the action of lifting the presser foot through the presser foot lifting transmission mechanism; meanwhile, the two corners of the shifting fork are of a long-short structure, and the shifting fork can be separated from the convex column after the shorter side pushes the convex column to move for a short distance, so that the functions of lifting the presser foot and trimming threads are not affected mutually; when the thread is cut or the foot is lifted, the thread loosening driving rod can drive the thread loosening mechanism to act in a matching mode, and therefore the working stability is guaranteed.

In addition, the utility model is also provided with a clothing grating and an encoder, the encoder is connected with the controller circuit of the sewing machine, the drive motor with the encoder performs closed-loop control during working, the reliability is increased, and the step-out risk is thoroughly solved; the system has the advantages of quick response, high-speed positioning and better accurate position control.

Drawings

FIG. 1 is a schematic view of the structure of the present invention installed on a sewing machine;

fig. 2 is a schematic structural diagram (one) of the present invention;

fig. 3 is a schematic structural diagram (ii) of the present invention;

fig. 4 is a schematic structural diagram (three) of the present invention;

FIG. 5 is a schematic structural view of the shift fork of the present invention;

fig. 6 is a schematic structural view of the presser foot lifting cam of the present invention.

Detailed Description

As shown in fig. 1-6, an automatic thread trimming and presser foot lifting control device for a sewing machine comprises a driving motor 2, a motor mounting seat 3, a thread trimming transmission mechanism 4 and a presser foot lifting transmission mechanism, wherein the driving motor 2 is fixed on the motor mounting seat 3, the motor mounting seat 3 is fixed on the back of the sewing machine body 1, the sewing machine body 1 comprises a machine head 11 and a machine base 12, the thread trimming transmission mechanism 4 is arranged inside the machine base 12, the presser foot lifting transmission mechanism is arranged inside the machine head 11, a grating sheet mounting seat 26 and a grating sheet 27 are further sleeved on a rotating shaft of the driving motor 2, an encoder 28 is further fixed on the end portion of a shell of the driving motor 2 corresponding to the grating sheet, and the encoder 28 is in circuit connection with a controller of the sewing machine.

The output shaft of the driving motor 2 is respectively sleeved with a presser foot lifting driving part and a thread cutting driving part, the thread cutting driving part is connected with a thread cutting transmission mechanism 4 through a thread cutting driving rod 5, the presser foot lifting driving part is connected with the presser foot lifting transmission mechanism through a presser foot lifting lever 6, and the driving motor 2 is connected with a sewing machine controller circuit; the motor mounting seat 3 is provided with a guide seat 31 of the trimming drive rod, the trimming drive rod 5 penetrates through a guide hole in the guide seat 31, the output end of the trimming drive part is movably connected with a reset seat 32, the reset seat 32 is fixedly connected to the trimming drive rod 5, the trimming drive rod 5 is sleeved with a reset spring 33, one end of the reset spring 33 abuts against the reset seat 32, the other end of the reset spring abuts against the guide seat 31, and one end of the trimming drive rod 5 is connected with the trimming transmission mechanism 4; the other end of the thread trimming drive rod 5 is connected with a thread loosening drive rod 36.

The trimming driving part is a rocker arm 21, the rocker arm 21 is sleeved on an output shaft of the driving motor 2, a shifting fork 22 is arranged at the free end of the rocker arm 21, a convex column 35 is arranged on the reset seat 32, and the convex column 35 is matched with the shifting fork 22; the two corners of the shift fork 22 are of a long structure and a short structure; the left and right movement tracks of the convex column 35 are all within the range of the end circumference track of the long angle 221, and the position of the initial state of the convex column 35 is outside the range of the end circumference track of the short angle 222.

The presser foot lifting driving part is a presser foot lifting cam 23, the presser foot lifting cam 23 is connected with a presser foot lifting transmission mechanism through a presser foot lifting lever 6, the presser foot lifting lever 6 is pivoted on the sewing machine body 1, the input end of the presser foot lifting lever 6 is pivoted with a roller 61, and the roller 61 is matched with the outer edge of the presser foot lifting cam 23; the outer edge of the pressure raising and pressing foot cam 23 is provided with a driving part 231 and a non-driving part 232, the junction of the two parts of the driving part 231 and the non-driving part 232 is in smooth transition, and a blocking part 233 is arranged between the other part.

The utility model solves the problems of the open-loop stepping motor, and adopts the stepping motor with the encoder to perform closed-loop control; the advantages are that: 1. reliability is improved, and the out-of-step risk is thoroughly solved; 2. the system has the advantages of quick response, high-speed positioning and better accurate control of the position; 3. the smoothness can be greatly improved, and the power consumption and the inherent vibration are reduced; 4. high torque output, high resolution, no differential feedback.

The utility model discloses a sewing machine controller control driving motor corotation or reversal, when driving motor corotation the long angle 221 of the fork 22 of rocking arm 21 free end promoted projection 35, drives trimming actuating lever linear motion this moment and lifts the presser foot cam and for non-drive portion and gyro wheel cooperation, lifts the presser foot lever and can not move, after corotation targets in place, driving motor drives rocking arm 21 reversal, and the seat that resets 32 resets under the effect of spring and short angle 222, has realized the trimming action; when the driving motor rotates reversely, the driving part 231 of the presser foot lifting cam is matched with the roller 61, and the presser foot lifting lever 6 rotates to realize the presser foot lifting action through the presser foot lifting transmission mechanism; the two corners of the shifting fork 22 of the utility model are a long and short structure, when the reset seat 32 is reset, the shifting fork 22 can be separated from the convex column 25 after the short corner 222 pushes the convex column 35 to move a small distance, thereby the functions of lifting and pressing the foot and cutting the thread are not affected; because the left and right movement tracks of the convex column 35 are all within the range of the end part circumference track of the long angle 221, the convex column 35 can not be separated from the shift fork 22 when the long angle 221 pushes the convex column 35, thereby ensuring the stability of the work; the thread loosening driving rod drives the thread loosening mechanism to cooperatively act when thread trimming or foot lifting is carried out.

Claims

1. The utility model provides an automatic trimming of sewing machine and lift presser foot controlling means, includes driving motor (2), motor mount pad (3), trimming drive mechanism (4) and lifts presser foot drive mechanism, and driving motor (2) are fixed on motor mount pad (3), and motor mount pad (3) link firmly its characterized in that with sewing machine body (1): the output shaft of the driving motor (2) is respectively sleeved with a presser foot lifting driving part and a thread cutting driving part, the thread cutting driving part is connected with a thread cutting transmission mechanism (4) through a thread cutting driving rod (5), the presser foot lifting driving part is connected with the presser foot lifting transmission mechanism through a presser foot lifting lever (6), and the driving motor (2) is in circuit connection with a sewing machine controller.

2. An automatic thread trimming and presser foot lifting control device for a sewing machine as claimed in claim 1, wherein: motor mount pad (3) on be provided with guide holder (31) of trimming actuating lever, trimming actuating lever (5) pass the guiding hole on guide holder (31), the output and reset seat (32) swing joint of trimming drive division, reset seat (32) link firmly on trimming actuating lever (5), the cover is sheathe in and is equipped with reset spring (33) trimming actuating lever (5), reset spring (33) one end top is on reset seat (32), the other end top is on guide holder (31), wherein one end and trimming drive mechanism (4) of trimming actuating lever (5) are connected.

3. An automatic thread trimming and presser foot lifting control device for a sewing machine as claimed in claim 2, wherein: the other end of the thread trimming driving rod (5) is connected with a thread loosening driving rod (36).

4. An automatic thread trimming and presser foot lifting control device for a sewing machine as claimed in claim 2, wherein: the trimming driving part is a rocker arm (21), the rocker arm (21) is sleeved on an output shaft of the driving motor (2), a shifting fork (22) is arranged at the free end of the rocker arm (21), a convex column (35) is arranged on the reset seat (32), and the convex column (35) is matched with the shifting fork (22).

5. An automatic thread trimming and presser foot lifting control device for a sewing machine as claimed in claim 4, wherein: the two angles of the shifting fork (22) are of a long-short structure; the left and right movement tracks of the convex column (35) are all within the range of the end part circumferential track of the long angle (221), and the position of the initial state of the convex column (35) is outside the range of the end part circumferential track of the short angle (222).

6. An automatic thread trimming and presser foot lifting control device for a sewing machine as claimed in claim 1, wherein: the presser foot lifting driving part is a presser foot lifting cam (23), the presser foot lifting cam (23) is connected with the presser foot lifting transmission mechanism through a presser foot lifting lever (6), the presser foot lifting lever (6) is pivoted on the sewing machine body (1), the input end of the presser foot lifting lever (6) is pivoted with a roller (61), and the roller (61) is matched with the outer edge of the presser foot lifting cam (23).

7. An automatic thread trimming and presser foot lifting control device for a sewing machine as claimed in claim 1, wherein: the sewing machine is characterized in that the motor mounting seat (3) is fixed to the back of the sewing machine body (1), the sewing machine body (1) comprises a machine head (11) and a machine base (12), the thread cutting transmission mechanism (4) is arranged inside the machine base (12), and the presser foot lifting transmission mechanism is arranged inside the machine head (11).

8. An automatic thread trimming and presser foot lifting control device for a sewing machine as claimed in claim 1, wherein: the rotating shaft of the driving motor (2) is further sleeved with a grating sheet mounting seat (26) and a grating sheet (27), an encoder (28) is further fixed on the position, corresponding to the grating sheet, of the end portion of the shell of the driving motor (2), and the encoder (28) is connected with a controller circuit of the sewing machine.

9. An automatic thread trimming and presser foot lifting control device for a sewing machine as claimed in claim 6, wherein: the outer edge of the presser foot lifting cam (23) is provided with a driving part (231) and a non-driving part (232), the driving part (231) and the non-driving part (232) are arranged at the junction, one of the two parts is in smooth transition, and a blocking part (233) is arranged between the two parts.