CN211947505U

CN211947505U - Automatic backstitch structure of sewing machine

Info

Publication number: CN211947505U
Application number: CN201922305049.9U
Authority: CN
Inventors: 朱广运; 朱龙明; 卢委丽; 王健
Original assignee: Zhejiang Longtai Sewing Equipment Co ltd
Current assignee: Zhejiang Longtai Sewing Equipment Co ltd
Priority date: 2019-12-19
Filing date: 2019-12-19
Publication date: 2020-11-17
Anticipated expiration: 2029-12-19

Abstract

The utility model relates to a sewing machine field especially relates to an automatic backstitch structure of sewing machine, including the work feed motor, be provided with a swing crank on it, the lower extreme fixed connection of swing crank and pull rod, the upper end and the gauge needle crank fixed connection of pull rod, the lower extreme fixed connection of gauge needle crank upper end and gauge needle regulation pendulum rod middle-end and gauge needle connecting rod, the gauge needle is adjusted the pendulum rod upper end and is rotated with the chain stay with the upper end of gauge needle connecting rod and be connected, chain stay upper end and second work feed cam fixed connection, and second work feed cam cover is established at first work feed cam periphery side. The utility model overcomes sewing machine backstitch structure among the prior art needs manual regulation, and the noise is great, and defect that production efficiency is low controls it through using the work feed motor, can effectively reduce the manual operation degree of difficulty, and smooth degree when having promoted the backstitch simultaneously to reduce the noise and promoted work efficiency, and the quality of product also promotes equally.

Description

Automatic backstitch structure of sewing machine

Technical Field

The utility model relates to a sewing machine field especially relates to an automatic backstitch structure of sewing machine.

Background

A sewing machine is a machine that uses one or more sewing threads to form one or more stitches in a material to be sewn, thereby interweaving or stitching one or more layers of material. The sewing machine can sew fabrics such as cotton, hemp, silk, wool, artificial fiber and the like and products such as leather, plastic, paper and the like, and the sewed stitches are neat, beautiful, flat and firm, the sewing speed is high, and the use is simple and convenient. A lot of sewing machines that have now need practical manual adjustment at the backstitch in-process, consequently the operation degree of difficulty is great, and manual adjustment noise is great simultaneously, and production efficiency is difficult to promote, and the product quality that the production obtained is difficult to control.

For example, the backstitch device of the sewing machine with the application number of CN201220304387.6 has the advantages of novel structure concept, good practical use effect and the like.

SUMMERY OF THE UTILITY MODEL

The utility model relates to an overcome the sewing machine backstitch structure among the prior art and need manual regulation, the noise is great, and defect that production efficiency is low provides the automatic backstitch structure of sewing machine that can go on automatically.

In order to realize the purpose of the utility model, the utility model discloses a following technical scheme realizes:

an automatic backstitch structure of a sewing machine comprises a base and a machine body fixedly connected above the base, wherein a cloth feeding motor is arranged in the base, a swing crank is arranged on the upper part of the lifting device, the swing crank is fixedly connected with the lower end of a pull rod, the upper end of the pull rod is fixedly connected with a stitch length crank through a first pin shaft, the first pin shaft also penetrates through the lower end of the stitch length crank and is fixedly connected with the lower end of a stitch length adjusting swing rod, the upper end of the needle pitch crank and the middle end of the needle pitch adjusting swing rod are fixedly connected with the lower end of a needle pitch connecting rod through a second pin shaft, the upper end of the needle pitch adjusting swing rod and the upper end of the needle pitch connecting rod are rotationally connected with the tooth fork through a third pin shaft, the upper end of the feed fork is fixedly connected with a second cloth feeding cam which is sleeved on the outer peripheral side of the first cloth feeding cam, the first cloth feeding cam is sleeved on the outer side of the upper shaft, and a connecting rod is further sleeved on the first cloth feeding cam.

The utility model provides an automatic reverse seal device of sewing machine controls it through using the work feed motor, can effectively reduce the manual operation degree of difficulty, the smooth degree when having promoted the backstitch simultaneously to reduce the noise and promoted work efficiency, simultaneously, owing to adopt motor operation to make its backstitch precision promote by a wide margin, thereby make the quality of the product that final processing obtained also promote equally.

Preferably, a sensor for controlling the movement of the motor is arranged outside the cloth feeding motor.

The utility model discloses still be provided with the operation that the sensor can effective control motor in the motor outside to make the motion precision effectively promote.

Preferably, the needle pitch crank is formed by arranging and fixing a first swinging block and a second swinging block in a V shape, wherein the connecting part of the first swinging block and the second swinging block is fixedly connected with the pull rod, and the upper end of the second swinging block is rotatably connected with the middle end of the needle pitch adjusting swinging rod.

Preferably, a fixing groove is formed at the lower end of the needle pitch adjusting swing rod, and the fixing groove is fixedly connected with a first operating crank.

Preferably, the first actuating crank is rotatably connected to one end of a second actuating crank, the other end of which is rotatably connected to the end of a longitudinal axis of the backstitch.

Preferably, the backstitch longitudinal shaft body is rotatably connected with the machine body through a backstitch transverse shaft, and the other end part of the backstitch longitudinal shaft is rotatably connected with a backstitch wrench.

The utility model discloses in although adopted the motor as the driver part of backstitch device, nevertheless be provided with a manual backstitch spanner simultaneously for the suitability of backstitch device is more extensive.

Preferably, the first cloth feeding cam is formed by sequentially and eccentrically connecting a first rotating shaft, a second rotating shaft and a third rotating shaft, the first rotating shaft is fixedly connected with the connecting rod, and the second rotating shaft is fixedly connected with the second cloth feeding cam.

Preferably, two fixed guide rails for fixing the tooth fork are symmetrically arranged on the outer side of the second cloth feeding cam, and two clamping blocks with the width matched with the fixed guide rails are respectively arranged at two ends of an opening at the upper end of the tooth fork.

Therefore, the utility model discloses following beneficial effect has:

(1) the cloth feeding motor is used for controlling the cloth feeding motor, so that the manual operation difficulty can be effectively reduced;

(2) meanwhile, the smoothness degree of backstitch is improved, so that the noise is reduced, and the working efficiency is improved;

(3) the quality of the product is also improved.

Drawings

Fig. 1 is a schematic view of an overall structure of the present invention.

Fig. 2 is a schematic view of the backstitch structure of the present invention.

Fig. 3 is a front view of fig. 2.

Fig. 4 is a schematic structural view of the pitch crank of the present invention.

Fig. 5 is a schematic structural view of the needle pitch adjusting swing rod of the present invention.

Fig. 6 is a schematic structural view of the first cloth feeding cam of the present invention.

Fig. 7 is a schematic structural view of a second cloth feeding cam of the present invention.

Fig. 8 is a schematic view of the mechanism of the tooth fork of the present invention.

Wherein: the cloth feeding mechanism comprises a base 1, a machine body 2, a cloth feeding motor 3, a swinging crank 4, a pull rod 5, a stitch length crank 6, a first pin shaft 7, a stitch length adjusting swing rod 8, a second pin shaft 9, a stitch length connecting rod 10, a third pin shaft 11, a tooth fork 12, a second cloth feeding cam 13, a first cloth feeding cam 14, an upper shaft 15, a first swinging block 16, a second swinging block 17, a fixing groove 18, a first operating crank 19, a second operating crank 20, a backstitch longitudinal shaft 21, a backstitch transverse shaft 22, a first rotating shaft 23, a second rotating shaft 24, a third rotating shaft 25, a connecting rod 26, a fixing guide rail 27, a clamping block 28, a sensor 29 and a backstitch wrench 30.

Detailed Description

The invention is further described with reference to the drawings and the specific embodiments.

As shown in figures 1-8, an automatic backstitch structure of a sewing machine comprises a base 1 and a machine body 2 fixedly connected above the base 1.

The base 1 is internally provided with a cloth feeding motor 3, the outer side of the base is also provided with a sensor 29 for controlling the motor to move, the cloth feeding motor 3 is provided with a swinging crank 4, the swinging crank 4 is fixedly connected with the lower end of a pull rod 5, the upper end of the pull rod 5 is fixedly connected with a needle pitch crank 6 through a first pin shaft 7, the needle pitch crank 6 is obtained by arranging and fixing a first swinging block 16 and a second swinging block 17 in a V shape, wherein the connecting part of the first swinging block 16 and the second swinging block 17 is fixedly connected with the pull rod, the first pin shaft 7 also penetrates through the upper end of the second swinging block 17 of the needle pitch crank 6 and is fixedly connected with the lower end of a needle pitch adjusting swing rod 8, the second swinging block 17 of the needle pitch crank 6 and the middle end of the needle pitch adjusting swing rod 8 are fixedly connected with the lower end of a needle pitch connecting rod 10 through a second pin shaft 9, the upper end of the needle pitch adjusting swing rod 8 and the upper end of the needle pitch connecting rod 10 are rotatably connected with a tooth fork 12, the upper end of the feed fork 12 is fixedly connected with the second feed cam 13, two fixed guide rails 27 for fixing the feed fork 12 are symmetrically arranged on the outer side of the second feed cam 13 and correspond to the fixed guide rails, two clamping blocks 28 with the width matched with the fixed guide rails 27 are respectively arranged at two ends of an opening at the upper end of the feed fork 12, the second feed cam 13 is sleeved on the outer peripheral side of the first feed cam 14, the first feed cam 14 is formed by sequentially and eccentrically connecting a first rotating shaft 23, a second rotating shaft 24 and a third rotating shaft 25, the first rotating shaft 23 is fixedly connected with a connecting rod 26, the second rotating shaft 24 is fixedly connected with the second feed cam 13, the first feed cam 14 is sleeved on the outer side of the upper shaft 15, and the first feed cam 14 is further sleeved with a connecting rod 26.

The lower end of the needle pitch adjusting swing rod 8 is provided with a fixing groove 18, the fixing groove 18 is fixedly connected with a first control crank 19, the first control crank 19 is rotatably connected with one end of a second control crank 20, the other end of the second control crank 20 is rotatably connected with the end of a backstitch longitudinal shaft 21, the shaft body of the backstitch longitudinal shaft 21 is rotatably connected with the machine body 2 through a backstitch transverse shaft 22, and the other end of the backstitch longitudinal shaft 21 is rotatably connected with a backstitch wrench 30.

The utility model discloses the theory of operation:

the sensor 29 is programmed to send an instruction, the cloth feeding motor 3 rotates by an angle, the swinging crank 4 is driven to swing up and down, the pull rod 5 is driven to pull up and down, the needle pitch crank 6 swings up and down by a certain angle, the needle pitch adjusting swing rod 8 is driven to adjust and swing, the needle pitch connecting rod 10 swings, and the tooth fork 12 is driven to complete feeding according to requirements. The utility model discloses a work feed motor 3 for structure reduces the manual operation degree of difficulty, and the noise reduction raises the efficiency to can improve processing product quality.

Claims

1. An automatic backstitch structure of a sewing machine comprises a base (1) and a machine body (2) fixedly connected above the base (1), and is characterized in that a cloth feeding motor (3) is arranged inside the base (1), a swing crank (4) is arranged on the base, the swing crank (4) is fixedly connected with the lower end of a pull rod (5), the upper end of the pull rod (5) is fixedly connected with a needle distance crank (6) through a first pin shaft (7), the first pin shaft (7) also penetrates through the lower end of the needle distance crank (6) and is fixedly connected with the lower end of a needle distance adjusting swing rod (8), the upper end of the needle distance crank (6) is fixedly connected with the middle end of the needle distance adjusting swing rod (8) through a second pin shaft (9) and the lower end of a needle distance connecting rod (10), the upper end of the needle distance adjusting swing rod (8) is rotatably connected with a tooth fork (12) through a third pin shaft (11) and the upper end of the needle distance connecting rod (10), the upper end of the tooth fork (12) is fixedly connected with a second cloth feeding cam (13), the second cloth feeding cam (13) is sleeved on the periphery side of a first cloth feeding cam (14), the first cloth feeding cam (14) is sleeved on the outer side of the upper shaft (15), and a connecting rod (26) is further sleeved on the first cloth feeding cam (14).

2. An automatic backstitch structure of a sewing machine according to claim 1, characterized in that a sensor (29) for controlling the motor movement is further provided outside the cloth feeding motor (3).

3. The automatic backstitch structure of a sewing machine according to claim 1, characterized in that the needle pitch crank (6) is formed by arranging and fixing a first swing block (16) and a second swing block (17) in a V shape, wherein the connecting part of the first swing block (16) and the second swing block (17) is fixedly connected with the pull rod, and the upper end of the second swing block (17) is rotatably connected with the middle end of the needle pitch adjusting swing rod (8).

4. An automatic backstitch structure of a sewing machine according to claim 1, characterized in that the lower end of the needle pitch control swing link (8) is provided with a fixing groove (18), and the fixing groove (18) is fixedly connected with a first operating crank (19).

5. An automatic backstitch structure for sewing machines according to claim 4, characterized in that said first operating crank (19) is rotatably connected to one end of a second operating crank (20), the other end of said second operating crank (20) being rotatably connected to the end of a backstitch longitudinal shaft (21).

6. An automatic backstitch structure of a sewing machine according to claim 5, characterized in that the shaft body of the backstitch longitudinal shaft (21) is rotatably connected with the machine body (2) through a backstitch transverse shaft (22), and the other end of the backstitch longitudinal shaft (21) is rotatably connected with a backstitch wrench (30).

7. The automatic backstitch structure of the sewing machine according to claim 1, characterized in that the first cloth feeding cam (14) is formed by connecting a first rotating shaft (23), a second rotating shaft (24) and a third rotating shaft (25) in an eccentric manner in sequence, the first rotating shaft (23) is fixedly connected with a connecting rod (26), and the second rotating shaft (24) is fixedly connected with the second cloth feeding cam (13).

8. The automatic backstitch structure of the sewing machine according to claim 1 or 7, characterized in that two fixed guide rails (27) for fixing the fork (12) are symmetrically arranged outside the second cloth feeding cam (13), and two ends of the opening at the upper end of the fork (12) are respectively provided with a fixture block (28) with the width matched with the fixed guide rails (27).