CN215829020U

CN215829020U - Sewing machine

Info

Publication number: CN215829020U
Application number: CN202122281013.9U
Authority: CN
Inventors: 林子春; 林群; 李质彬; 刘霖; 潘林勇
Original assignee: Qixing Intelligent Technology Co Ltd
Current assignee: Qixing Intelligent Technology Co Ltd
Priority date: 2021-07-27
Filing date: 2021-09-18
Publication date: 2022-02-15
Anticipated expiration: 2031-09-18
Also published as: CN215829019U

Abstract

The application provides a sewing machine, concretely relates to sewing machine technical field. Install swing crank on the output shaft that connects through driving motor, be fixed with the crank on work feed axle or the work feed toothholder, swing crank and articulate middle part position are provided with connecting portion, and the connecting rod both ends configuration is at swing crank and articulate connecting portion and articulated to this implements multiple connection scheme, has the advantage that effectively alleviates the noise and improve the connection between each spare part and moving equilibrium degree, makes sewing machine's mechanical transmission performance can improve. In addition, the technical scheme that the existing sewing machine is provided with the swing seat is omitted, the manufacturing cost of the sewing machine is reduced, the high dependence on a lubricating system is reduced, and the technical effect of being free of maintenance and lubrication is achieved.

Description

Sewing machine

Technical Field

The application provides a sewing machine, concretely relates to sewing machine technical field.

Background

The existing swing seat is an indispensable part in a needle pitch adjusting mechanism of a sewing machine, the existing sewing device generally has an important part of the swing seat, the swing seat is arranged between a connecting rod and a step feeding shaft crank, so that the needle pitch adjusting function is realized, and subsequently, many sewing machine manufacturers propose to control the adjustment of the needle pitch by using a stepping motor, but the driving of the stepping motor is carried out by depending on the swing seat, the structure is complex, and the manufacturing cost is relatively high; in addition, the dependence on the lubrication system is large, and much inconvenience is brought to maintenance and assembly.

In addition, the technical scheme shows that: a swing crank is fixedly arranged on a cloth feeding motor output shaft connected with a cloth feeding motor, the swing crank is hinged with a connecting rod, the connecting rod is hinged with a cloth feeding shaft crank, the cloth feeding shaft crank is fixed on the rear end of a cloth feeding shaft, the front end of the cloth feeding shaft is connected with a cloth feeding tooth holder, the cloth feeding tooth holder is connected with a cloth feeding tooth frame, and the cloth feeding tooth is fixed on the cloth feeding tooth frame; the feed lifting tooth driving source is connected with a feed lifting tooth shaft, the other end of the feed lifting tooth shaft is connected with a feed lifting tooth fork-shaped crank, and the feed lifting tooth fork-shaped crank is matched with a movable shaft of the feed feeding tooth frame. The problems of high noise and slight shake in operation of the sewing machine caused by the defect of unreasonable structure of the connecting rod hinged cloth feeding shaft crank are particularly provided.

Disclosure of Invention

To there being that the unreasonable running noise of structure is big, swing seat maintenance assembly is inconvenient and to the great not enough of lubricating system dependence to above-mentioned sewing machine, above-mentioned at least one technical problem can be solved in this application, this application provides a sewing machine, has driving motor and feed dog, the indirect drive feed dog of driving motor, its characterized in that, install swing crank on the output shaft that driving motor connects, be fixed with the crank on feed shaft or the feed dog seat, swing crank and articulate middle part position are provided with connecting portion, and the connector configuration that the connecting rod both ends have is at swing crank and articulate connecting portion and articulated.

Furthermore, the connecting parts at the two ends of the connecting rod are respectively hinged with the connecting head of the swinging crank and the connecting head of the crank.

Furthermore, the crank is fixedly installed on one side, close to the driving motor, of the cloth feeding shaft, a cloth feeding tooth seat is installed on one side, close to the cloth feeding teeth, of the cloth feeding shaft, a cloth feeding tooth frame is hinged to the cloth feeding tooth seat in a matched mode, and the cloth feeding teeth are fixedly installed on the cloth feeding tooth frame.

Furthermore, the crank is fixedly arranged on the cloth feeding shaft and positioned outside the cloth feeding tooth seat.

Further, the driving motor is installed and fixed on the side frame of the sewing machine.

Furthermore, the driving motor outputs a swinging source in a reciprocating swinging operation mode, is installed and fixed on a base plate of the sewing machine and is installed on one side close to the feed dog.

Further, the driving motor is installed on a bracket, and the bracket is fixed on the substrate.

The sewing machine is further provided with a needle pitch adjusting mechanism for executing needle pitch adjustment, under the control of the control system, the output shaft connected with the driving motor in a driving mode enables the swinging angle of the swinging crank and the connecting rod to be changed, the larger the swinging angle of the swinging crank after adjustment is, the larger the needle pitch is, and the smaller the swinging angle of the swinging crank is, the smaller the needle pitch is.

Furthermore, the sewing machine is also provided with a feed dog zero-gauge positioning mechanism, the drive motor drives a swing crank on an output shaft under the control of the control system, and the feed dog is positioned at the upper needle position of the upper plane of the needle plate or the position which is flush with the upper plane of the needle plate through the crank, the feed shaft, the feed dog seat, the feed dog frame and the feed dog.

Further, the crank is integrated with the feed dog seat.

Furthermore, the sewing machine is also provided with a thread cutting and presser foot lifting mechanism which comprises a thread cutting assembly and a presser foot lifting assembly, wherein the thread cutting assembly is arranged below a sewing machine base plate, the thread cutting assembly starts a thread cutting electromagnet to execute thread cutting action under the control of a control system, and after thread cutting is finished, the presser foot lifting electromagnet arranged on a sewing machine head starts to execute the presser foot lifting action.

Install swing crank on this application's the output shaft through driving motor connects, be fixed with the crank on work feed axle or the work feed toothholder, swing crank and articulate middle part position are provided with connecting portion, the configuration of connecting rod both ends is at swing crank and articulate connecting portion and articulated, implement three kinds of connection schemes with this, the sewing machine of this application effectively alleviates the noise that sends between the spare part, connection and moving equilibrium degree between each spare part have effectively been improved simultaneously, make sewing machine's mechanical transmission performance can improve. In addition, the technical scheme that the existing sewing machine is provided with the swing seat is omitted, the sewing machine cost is reduced in manufacturing, the high dependence on a lubricating system is greatly reduced in use and maintenance, and the technical effect that the maintenance is free and the lubrication is not needed is achieved.

Drawings

FIG. 1 is a schematic view of a sewing machine according to the present application;

FIG. 2 is a schematic view of a feed dog drive mechanism of a sewing machine according to the present application;

FIG. 3 is a configuration diagram of a second embodiment of a sewing machine according to the present application;

FIG. 4 is a schematic view of a feed dog driving mechanism of a second embodiment of a sewing machine according to the present application;

FIG. 5 is a schematic view of a feed dog driving mechanism of a third embodiment of a sewing machine according to the present application;

FIG. 6 is an exploded perspective view of a connecting rod and a swing crank of a fourth embodiment of a sewing machine according to the present application.

Reference numerals: the cloth feeding device comprises a driving motor 11, an output shaft 12, a support 13, a swinging crank 21, a connecting rod 22, a connecting part 2a, a connecting head 2b, a crank 23, a cloth feeding shaft 24, a cloth feeding tooth holder 25, a cloth feeding tooth rack 26, a cloth feeding tooth 27, a needle plate upper plane 28, a main shaft motor 31, a tooth lifting connecting rod 32, a lifting and pressing shaft 33 and a fork rod crank 34.

Detailed Description

Preferred embodiments of the present application will be described in detail below with reference to fig. 1-5, so that the advantages and features of the present application can be more easily understood by those skilled in the art, and the scope of protection of the present application will be clearly and clearly defined, and these embodiments are only for illustrating the present invention and are not limited thereto.

Example one

The application provides a sewing machine which is provided with a cloth feeding driving mechanism, a needle pitch adjusting mechanism, a cloth feeding tooth zero needle pitch positioning mechanism, a thread cutting and presser foot lifting mechanism, a control system and the like, and the sewing machine has all functions of realizing normal sewing work except that the sewing machine does not have a swing seat required by traditional needle pitch adjustment.

The sewing machine comprises a driving motor 11, a swing crank 21, a connecting rod 22, a crank 23, a cloth feeding shaft 24, a cloth feeding tooth seat 25, a cloth feeding tooth frame 26, a cloth feeding tooth 27 and the like. The installation of driving motor 11 is fixed on sewing machine's side organism, and this scheme can be on the basis of original sewing machine structure directly install driving motor 11, swing crank 21, connecting rod 22 and crank 23 alright in order to have used additional.

In the cloth feeding driving mechanism, a control system controls a driving motor 11 to output a swinging source in a reciprocating swinging operation mode, a swinging crank 21 is installed on an output shaft 12 connected with the driving motor 11, a crank 23 is fixed on a cloth feeding shaft 24, and a connecting rod 22 is connected between the swinging crank 21 and the crank 23; the cloth feeding tooth holder 25 is installed on one side of the cloth feeding shaft 24 close to the cloth feeding tooth 27, the cloth feeding tooth holder 26 is hinged on the cloth feeding tooth holder 25 in a matching mode, the cloth feeding tooth 27 is fixedly installed on the cloth feeding tooth holder 26, the swing crank 21 indirectly transmits a swing source output by the driving motor 11 to the cloth feeding tooth holder 26 through the parts, the cloth feeding tooth holder 26 swings at a certain angle, the cloth feeding tooth 27 installed on the cloth feeding tooth holder 26 has front and back cloth feeding actions of sewing work, and a swing seat is not arranged between the output shaft 12 of the sewing machine driving motor 11 and the crank 23. The technical scheme that the existing sewing machine has the swing seat is omitted, the sewing machine cost is reduced in manufacturing, the high dependence on a lubricating system is greatly reduced in use and maintenance, and the technical effect that the maintenance is free and the lubrication is not needed is achieved.

The crank 23 is fixed on the cloth feeding shaft 24 near the driving motor 11, and the connecting parts are near the side machine body of the sewing machine. A connecting rod 22 is connected between the swing crank 21 and the crank 23, a connecting part 2a is arranged at the middle position of the swing crank 21 and the crank 23, two ends of the connecting rod 22 are provided with connecting heads 2b, the connecting heads 2b at two ends of the connecting rod 22 are arranged at the connecting part 2a of the swing crank 21 and the crank 23, so that the connecting rod 22 is hinged at the middle position of the swing crank 21 and the crank 23, the swing crank 21 is hinged with the connecting rod 22 by a pin shaft, and the connecting rod 22 is hinged with the crank 23 by a pin shaft. The connecting rod 22 is configured at the connecting part 2a in the middle position of the swing crank 21 and the crank 23, so that the connecting quality between the three parts is effectively improved, the noise generated between the parts can be effectively reduced, the balance degree of connection and operation between the parts is effectively improved, and the mechanical transmission performance of the sewing machine is improved.

Under the drive of the sewing machine main shaft motor 31, the main shaft motor 31 generates up-and-down cloth feeding actions on the cloth feeding teeth 27 through the tooth lifting connecting rod 32, the lifting pressing shaft 33 and the fork lever crank 34, and the front-and-back cloth feeding actions of the cloth feeding teeth 27 and the up-and-down cloth feeding actions of the cloth feeding teeth 27 are combined with each other, namely, the two actions are fused on the cloth feeding teeth 27, so that the cloth feeding actions required by sewing of the sewing machine are generated, and the cloth feeding teeth 27 can normally carry out cloth feeding sewing.

In addition to the simple driving motor 11 driving the swing crank 21, the connecting rod 22, the crank 23 and the like to realize the front and back cloth feeding actions of the cloth feeding driving mechanism, the control system of the present application realizes the needle pitch adjustment of the needle pitch adjusting mechanism and the feed dog zero-needle pitch positioning of the feed dog zero-needle pitch positioning mechanism by controlling the driving motor 11, and the sewing machine of the present application has an intelligent control level.

When the needle pitch adjusting mechanism of the sewing machine executes needle pitch adjustment, under the control of the control system, the output shaft 12 connected with the driving motor 11 in a driving mode enables the swing angle of the swing crank 21 and the connecting rod 22 to be changed, the driving motor 11 determines a new needle pitch through a new back-and-forth swing angle, the larger the swing angle of the adjusted swing crank 21 is, the larger the needle pitch is, the smaller the swing angle of the swing crank 21 is, the smaller the needle pitch is, therefore, the size of the needle pitch is realized by completely depending on the control system to control the driving motor 11.

In the zero-gauge feed dog positioning mechanism of the sewing machine, when the zero-gauge feed dog position needs to be positioned, the driving motor 11 drives the swinging crank 21 on the output shaft 12 under the control of the control system, the swinging crank 21 pushes the crank 23 to be in the lowest position state through the connecting rod 22, and then the crank 23, the feed shaft 24, the feed dog seat 25, the feed dog frame 26 and the feed dog 27 enable the feed dog 27 to be in the upper needle position of the upper plane 28 of the needle plate or the basically level position (the upper needle position is higher than the upper plane 28 of the needle plate and lower needle position is lower than the upper plane 28 of the needle plate) with the upper plane 28 of the needle plate, the establishment of the two positions can effectively avoid the damage and the influence of the feed dog 27 on the thread trimming action of the thread trimming system, the zero-gauge feed dog positioning is set by the control system according to the specific sewing requirements of the sewing machine, after the zero-gauge feed dog positioning mechanism is established, the sewing machine has stable and reliable sewing process.

The thread trimming and presser foot lifting mechanism of the sewing machine comprises a thread trimming assembly and a presser foot lifting assembly. The thread cutting assembly is arranged under a sewing machine base plate, the thread cutting assembly starts the thread cutting electromagnet to perform thread cutting action under the control of the control system, the presser foot lifting electromagnet arranged on the sewing machine head starts to perform presser foot lifting action after thread cutting is completed, and the thread cutting assembly and the presser foot lifting assembly guarantee that the sewing machine finishes sewing work smoothly.

Example two

In fig. 3 and 4, the second embodiment is substantially the same as the first embodiment except that the driving motor 11 is mounted and fixed on the base plate of the sewing machine, or the driving motor 11 is mounted on the bracket 13 and then fixed on the base plate by the bracket 13. The driving motor 11 is installed at a side close to the feed dog 27, so that the feed shaft 24 can be made shorter, and the advantage that the driving motor 11 is installed close to the feed dog 27 so that the manufacturing cost of the feed shaft 24 is reduced is fully embodied.

There are also different arrangements in that the crank 23 is arranged on the feed block 25, or both are fixedly connected together, or the crank 23 is integrated with the feed block 25. The control system controls the driving motor 11 to output a swinging source in a reciprocating swinging operation mode, a swinging crank 21 is arranged on an output shaft 12 connected with the driving motor 11, a crank 23 is fixed on a feed dog seat 25, a connecting rod 22 is connected between the swinging crank 21 and the crank 23, the connecting rod 22 is arranged at a connecting part 2a at the middle position of the swinging crank 21 and the crank 23, a feed dog seat 25 is arranged on a shorter feed shaft 24, a feed dog frame 26 is hinged on the feed dog seat 25 in a matching way, a feed dog 27 is fixedly arranged on the feed dog frame 26, a swing crank 21 indirectly transmits a swing source output by a driving motor 11 to the feed dog frame 26 through the parts, the feed dog frame 26 swings at a certain angle, the feed dog 27 mounted on the feed dog holder 26 has a front and rear feed motion for sewing work, and similarly, there is no swing seat between the output shaft 12 of the sewing machine drive motor 11 and the crank 23. The cloth feeding action of the sewing machine under the drive of the main shaft motor 31 is integrated on the cloth feeding teeth 27 with the front and back cloth feeding actions of the cloth feeding teeth 27, so that the cloth feeding action required by sewing of the sewing machine is realized, and the cloth feeding teeth 27 can normally carry out cloth feeding sewing.

EXAMPLE III

In fig. 5, the third embodiment is substantially the same as the first and second embodiments, except that the crank 23 is fixedly mounted on the feed shaft 24 and located outside the feed dog seat 25, the swing crank 21 on the output shaft 12 connected to the driving motor 11 is connected to the crank 23 through the connecting rod 22, and the middle connecting portion 2a of the swing crank 21 is connected to the crank 23, so that the crank 23 mounted outside the feed dog seat 25 provides a front-back feed motion for the feed shaft 24, the feed dog seat 25, the feed dog holder 26 and the feed dog 27, and the overall technical effects are the same.

Example four

In fig. 6, the third embodiment is substantially the same as the second embodiment, except that in the above-mentioned connecting structure, the two ends of the connecting rod 22 are provided with the connecting parts 2a, the middle parts of the swing crank 21 and the crank 23 are provided with the connecting heads 2b matched with the connecting parts 2a, and the connecting parts 2a at the two ends of the connecting rod 22 are hinged with the connecting heads 2b of the crank by using a shaft pin, so that the connecting parts 2a at the two ends of the connecting rod 22 are respectively hinged with the connecting heads 2b of the swing crank 21 and the connecting heads 2b of the crank 23. The connecting rod 22 is effectively arranged between the connectors 2b hinged at the middle parts of the swing crank 21 and the crank 23, the connecting quality between parts is effectively improved by the arrangement of the connecting part 2a and the connectors 2b, firstly, the balance degree of connection and operation between the parts is effectively improved, secondly, the mechanical noise generated during operation between the parts is effectively reduced, and the mechanical transmission performance of the sewing machine is improved.

The above description is only a preferred embodiment of the present application, and not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings of the present application, or which are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.

Claims

1. A sewing machine is provided with a driving motor and a cloth feeding tooth, wherein the driving motor indirectly drives the cloth feeding tooth, and is characterized in that an output shaft connected with the driving motor is provided with a swinging crank, a crank is fixed on a cloth feeding shaft or a cloth feeding tooth seat, the middle positions of the swinging crank and the crank are provided with a connecting part, and connectors arranged at two ends of a connecting rod are arranged at the connecting parts of the swinging crank and the crank and are hinged.

2. The sewing machine of claim 1, wherein the connecting rod has connecting portions at both ends thereof respectively hinged to the connecting head of the swing crank and the connecting head of the crank.

3. The sewing machine of claim 1, wherein the crank is fixedly mounted on a side of the feed shaft adjacent to the driving motor, a feed dog seat is mounted on a side of the feed shaft adjacent to the feed dog, a feed dog holder is hinged to the feed dog seat in a matching manner, and the feed dog is fixedly mounted on the feed dog holder.

4. The sewing machine of claim 1, wherein the crank is mounted and fixed to the feed shaft outside the feed dog seat.

5. The sewing machine of claim 1, wherein the drive motor is mounted and fixed to a side frame of the sewing machine.

6. The sewing machine of claim 1, wherein the drive motor is mounted and fixed to a base plate of the sewing machine, and the drive motor is mounted on a side close to the feed dog.

7. The sewing machine of claim 6, wherein the drive motor is mounted on a bracket, the bracket being fixed to the base plate.

8. The sewing machine of claim 1, further comprising a stitch length adjustment mechanism for performing stitch length adjustment, wherein under the control of the control system, the driving motor drives the connected output shaft to change the swing angle of the swing crank and the connecting rod, the adjusted swing crank has a larger swing angle and a smaller swing angle, the larger the stitch length is, and the smaller the swing crank has the smaller stitch length.

9. The sewing machine of claim 1, further comprising a feed dog zero gauge positioning mechanism, wherein the drive motor drives the swing crank on the output shaft under the control of the control system, and the feed dog is positioned at the upper needle position of the upper plane of the needle plate or at the same level position with the upper plane of the needle plate through the crank, the feed shaft, the feed dog seat, the feed dog holder and the feed dog.

10. The sewing machine of claim 1, wherein the crank is integral with the feed block.