CN210712039U

CN210712039U - Synchronous sewing machine needle pitch adjusting and backstitch driving mechanism

Info

Publication number: CN210712039U
Application number: CN201921578088.XU
Authority: CN
Inventors: 朱义潜
Original assignee: Zhejiang Hulong Technology Co ltd
Current assignee: Zhejiang Hulong Technology Co ltd
Priority date: 2019-09-21
Filing date: 2019-09-21
Publication date: 2020-06-09
Anticipated expiration: 2029-09-21

Abstract

The utility model belongs to the technical field of sewing equipment, in particular to a needle pitch adjusting and backstitch driving mechanism of a synchronous sewing machine; the connecting rod is a flat rod, a first mounting hole and a second mounting hole are respectively formed in two ends of the connecting rod, the centers of the first mounting hole and the second mounting hole are located on the central line of the connecting rod, and the center distance L1 between the first mounting hole and the second mounting hole is 72.9-73.1 mm; one end of the crank is fixedly arranged on a rotating shaft of the driving motor, the other end of the crank is fixedly provided with a connecting pin, and one end of the connecting rod is sleeved on the connecting pin through a mounting hole; the swing seat is provided with an open slot, the other end of the connecting rod is arranged in the open slot, the swing seat is provided with a connecting rod pin penetrating through the open slot, and the mounting hole sleeve at the other end of the connecting rod is arranged on the connecting rod pin and connected with the swing seat; the utility model discloses can reach the big gauge needle more than 9mm, can be applicable to making up of various surface fabrics, efficient, stability is good.

Description

Synchronous sewing machine needle pitch adjusting and backstitch driving mechanism

The technical field is as follows:

the utility model belongs to the technical field of sewing equipment, refer in particular to a step sewing machine gauge needle is adjusted and backstitch actuating mechanism.

Background art:

the existing sewing machine is generally provided with a stitch length adjusting structure and a backstitch structure, and the stitch length adjusting structure and the backstitch structure are combined together and have the functions of backstitch, stitch length adjustment and the like. The traditional stitch length adjustment and backstitch driving of the sewing machine are driven by electromagnets, for example, the stitch length adjustment and automatic material reversing and feeding structure of the sewing machine disclosed in Chinese patent (CN 109518364A; published Japanese 2019.03.26) are driven by electromagnets. The electromagnet is very easy to rise in temperature due to too frequent work, so that the attraction force of the electromagnet is reduced, the switching between the backward and forward seams can not be realized in serious cases, the working stability is poor, in addition, the electromagnet driving also has the defects of high noise, low precision and the like, so that the driving motor is used for replacing the electromagnet, and the structure of the original connecting rod, the original driving crank and other parts needs to be changed in adaptability.

Chinese patent discloses (publication number: CN 109518363A; bulletin date: 2019.03.26) a backstitch and stitch length adjusting structure of a sewing machine, which comprises a backstitch assembly and a stitch length adjusting assembly, wherein the backstitch assembly comprises a backstitch crank which is arranged in a rotating way and a driving assembly which drives the backstitch crank to swing; the needle pitch adjusting assembly comprises a needle pitch adjusting piece, a connecting rod assembly and a swinging seat which is rotatably arranged and connected with the feeding shaft, one end of the connecting rod assembly is hinged with the needle pitch adjusting piece, the other end of the connecting rod assembly is hinged with the swinging seat, and the connecting rod assembly is connected with the backstitch crank in a sliding manner; the needle pitch adjusting piece is arranged on the machine shell and can be adjusted in length extending into the machine shell.

In the patent documents, when the length of the needle pitch adjusting piece extending into the machine shell is adjusted, the swinging seat is driven to swing through the connecting rod component, so that the size of the needle pitch is adjusted; when the driving component drives the backstitch crank to swing for a fixed angle, the swinging seat is driven to swing through the connecting rod component, and therefore the state adjustment between the backstitch and the front seam is completed.

The whole structure occupies a large space, the needle pitch adjusting range is small, generally 5mm, the needle pitch adjusting structure is suitable for sewing thin materials, and the sewing efficiency of thick materials is low; in addition, the structure shape and the specification size of each part are not disclosed, the sealing structure of parts such as a feeding shaft and the like during installation is not disclosed, and the installation adaptability of the whole body when the driving motor drives is poor.

The invention content is as follows:

the utility model aims at providing a compact structure, wide application range's synchronous sewing machine gauge needle are adjusted and backstitch actuating mechanism.

The utility model discloses a realize like this:

a needle pitch adjusting and backstitch driving mechanism of a synchronous sewing machine comprises a swing seat, a crank, a connecting rod and a driving motor, wherein the connecting rod is a flat rod, two ends of the connecting rod are respectively provided with a first mounting hole and a second mounting hole, the centers of the first mounting hole and the second mounting hole are positioned on a central line of the connecting rod, and the center distance L1 between the first mounting hole and the second mounting hole is 72.9-73.1 mm;

one end of the crank is fixedly arranged on a rotating shaft of the driving motor, the other end of the crank is fixedly provided with a connecting pin, and one end of the connecting rod is sleeved on the connecting pin through a mounting hole; the swing seat is provided with an open slot, the other end of the connecting rod is arranged in the open slot, the swing seat is provided with a connecting rod pin penetrating through the open slot, and the mounting hole sleeve at the other end of the connecting rod is arranged on the connecting rod pin and connected with the swing seat.

In the synchronous sewing machine needle pitch adjusting and backstitch driving mechanism, the aperture of the first mounting hole is 7-7.012 mm, and the aperture of the second mounting hole is 8.5-8.512 mm.

In the synchronous sewing machine needle pitch adjusting and backstitch driving mechanism, the front side surface of the connecting rod consists of a first side surface and a second side surface which are arranged up and down, a step surface is formed between the first side surface and the second side surface, the distance L2 from the first side surface to the rear side surface is 3.9-4.1 mm, the distance L3 from the second side surface to the rear side surface is 3.29-3.31 mm, and the distance L4 from the step surface to the center of the mounting hole II is 24.9-25.1 mm.

In the synchronous sewing machine needle pitch adjusting and backstitch driving mechanism, one end of the crank is provided with a third mounting hole, a bulge extends outwards from the end of the crank, the bulge is provided with an opening communicated with the third mounting hole, a rotating shaft of the driving motor is inserted into the third mounting hole, and a locking bolt penetrating through the opening is screwed on the bulge; the other end of the crank is provided with a fourth mounting hole, the connecting pin is inserted in the fourth mounting hole, and the other end of the crank is in threaded connection with a fixing screw which extends into the fourth mounting hole and fixes the connecting pin; the center of the third mounting hole and the center of the fourth mounting hole are located on the center line of the crank, and the center distance L5 between the third mounting hole and the fourth mounting hole is 35.9-36.1 mm.

In the synchronous sewing machine needle pitch adjusting and backstitch driving mechanism, the center line of the opening is perpendicular to the center line of the crank, and the center of the mounting hole III is positioned on the center line of the opening.

In the synchronous sewing machine needle pitch adjusting and backstitch driving mechanism, the aperture of the mounting hole III is 10-10.012 mm; the aperture of the mounting hole IV is 7 mm-7.012 mm.

In the above-described synchronous sewing machine pitch adjustment and backstitch drive mechanism, the opening gap L6 is 1.6 mm.

In the synchronous sewing machine needle pitch adjusting and backstitch driving mechanism, the driving motor is arranged on the rear end face of the shell, a through hole is formed in the shell, and the through hole is used for processing and reaming the outer end part of a backstitch wrench shaft hole in the shell or expanding the backstitch wrench shaft hole; the rotating shaft of the driving motor penetrates through a through hole in the shell to be connected with the crank, a framework oil seal is arranged between the through hole and the rotating shaft to seal oil or/and a sealing element used for sealing oil is arranged between the rear end face of the shell and the mounting end face of the driving motor.

In the needle pitch adjusting and backstitch driving mechanism of the synchronous sewing machine, the outer diameter of the framework oil seal is 22mm, 21.5mm, 21mm, 20mm or 19 mm.

In the needle pitch adjusting and backstitch driving mechanism of the synchronous sewing machine, the driving motor is a 86-base stepping motor, and the size of the silicon steel sheet of the motor body is 85.9-86.1 mm.

Compared with the prior art, the utility model outstanding advantage is:

1. the utility model fixes the driving motor on the rear end face of the shell, redesigns the structure of the connecting rod and the crank, optimizes the structure and the shape, and limits the gear, so that the amplitude of the swinging seat driven by the connecting rod and the crank is increased, the evidence adjusting range is wider, the large needle pitch of more than 9mm can be reached, the sewing machine can be suitable for sewing various fabrics, and the sewing machine has high efficiency and good stability;

2. the utility model has little improvement on the original casing, utilizes the framework oil seal or/and the end face oil seal to seal, ensures the lubricating effect and avoids the leakage of engine oil;

3. the utility model discloses driving motor is step motor, and the precision is high, can adjust the gauge needle by oneself.

Description of the drawings:

fig. 1 is a schematic diagram of the explosion structure of the present invention.

Fig. 2 is a front view of the connecting rod of the present invention.

Fig. 3 is a left side view of the connecting rod of the present invention.

Fig. 4 is a front view of the crank of the present invention.

Fig. 5 is a left side view of the crank of the present invention.

Fig. 6 is a plan view of the crank of the present invention.

In the figure: 1. a swing seat; 2. a crank; 3. a connecting rod; 4. a drive motor; 5. mounting screws; 6. a housing; 7. installing a flange; 8. a rotating shaft; 9. framework oil seal; 10. reaming; 11. a first mounting hole; 12. a second mounting hole; 13. a centerline of the connecting rod; 14. a connecting pin; 15. a clamp spring; 16. an open slot; 17. a link pin; 18. a first side surface; 19. a second side surface; 20. a step surface; 21. a third mounting hole; 22. a protrusion; 23. an opening; 24. locking the bolt; 25. a fourth mounting hole; 26. a set screw; 27. the center line of the crank; 28. the center line of the opening.

The specific implementation mode is as follows:

the invention will now be further described with reference to specific embodiments, with reference to figures 1 to 6:

a needle pitch adjusting and backstitch driving mechanism of a synchronous sewing machine comprises a swing seat 1, a crank 2, a connecting rod 3 and a driving motor 4. The driving motor 4 is installed on the rear end face of the casing 6 through the installation screws 5, specifically, the installation flange 7 is arranged on the casing of the driving motor 4, the installation flanges 7 are provided with the installation screws 5, and the installation screws 5 are respectively screwed in the corresponding threaded holes of the rear end face of the casing 6. A through hole is arranged on the casing 6, and a rotating shaft 8 of the driving motor 4 penetrates through the through hole to extend into the inner cavity of the casing 6 to be fixedly connected with the crank 2. The other end of the crank 2 is connected with one end of a connecting rod 3, and the other end of the connecting rod 3 is connected with the swinging seat 1; a framework oil seal 9 capable of dynamically sealing the through hole and the rotating shaft 8 of the driving motor 4 is arranged between the through hole and the rotating shaft, and/or a sealing element for sealing oil is arranged between the rear end face of the machine shell 6 and the installation end face of the driving motor 4. Wherein the sealing element comprises a gasket or a sealing ring.

The through hole is obtained by further processing a backstitch wrench shaft hole which is arranged on the shell 6 and is also a through hole. The processing mode comprises the following steps: a reaming hole 10 is processed at the outer end part of the shaft hole of the backstitch wrench, a framework oil seal 9 is arranged in the reaming hole 10, and in order to realize oil return, an oil return hole for communicating the reaming hole 10 with the inner cavity of the shell 6 is also required to be arranged on the shell 6; or the hole of the backstitch wrench is expanded, and the framework oil seal 9 is arranged in the through hole after the expansion. After expanding, the framework oil seal 9 can be directly arranged in the through hole or a shaft sleeve is arranged in the through hole, and then the framework oil seal 9 is arranged between the shaft sleeve and the rotating shaft 8 of the driving motor 4 for sealing oil. The outer diameter of the framework oil seal 9 is 22mm or 21.5mm or 21mm or 20mm or 19mm, preferably 21.5mm and 20 mm. The driving motor 4 is a 86-base stepping motor, and the size of the silicon steel sheet of the body of the driving motor 4 is 85.9-86.1 mm. The silicon steel sheet has a square structure, and the dimension of 85.9-86.1 is the side length of the square, preferably 86 mm.

When in use, the swinging seat 1 is a driving part of a needle pitch adjusting mechanism and a backstitch mechanism, and the needle pitch adjusting mechanism and the backstitch mechanism are the prior art on the sewing machine and are not described again. The size of the needle pitch is adjusted by changing the position angle of the swinging seat 1; or when the swinging seat 1 swings to a preset angle, the state change between the backward sewing and the forward sewing is completed. In the utility model, the driving motor 4 is fixedly arranged on the casing 6, and the structure, shape and size of the connecting rod 3 and the crank 2 are optimized, so that the whole structure is simple and reliable, the needle pitch adjusting range is enlarged, the use range of the whole machine is wider, and the stability of the driving mechanism in operation is ensured; the utility model discloses in to casing 6 improve little, reform transform with low costs, the commonality is high, simultaneously, lubricated effect has been guaranteed to the structure of sealing oil between casing 6 and driving motor 4's pivot 8, has less the leakage of machine oil greatly, has improved the quality of complete machine.

As shown in fig. 1, 2 and 3, the connecting rod 3 of the present invention is a flat rod, two ends of the connecting rod 3 are respectively provided with a first mounting hole 11 and a second mounting hole 12, centers of the first mounting hole 11 and the second mounting hole 12 are located on a central line 13 of the connecting rod 3, a center distance L1 between the first mounting hole 11 and the second mounting hole 12 is 72.9mm to 73.1mm, and preferably, L1 is 73mm in this embodiment; one end of the crank 2 is fixedly arranged on a rotating shaft 8 of the driving motor 4, the other end of the crank 2 is fixedly provided with a connecting pin 14, one end of the connecting rod 3 is sleeved on the connecting pin 14 through a first mounting hole 11 and is limited through a clamp spring 15; the swing seat 1 is provided with an open slot 16, the other end of the connecting rod 3 is arranged in the open slot 16, the swing seat 1 is provided with a connecting rod pin 17 penetrating through the open slot 16, and the second mounting hole 12 at the other end of the connecting rod 3 is sleeved on the connecting rod pin 17 and is connected with the swing seat 1.

The utility model discloses a pivot 8 of driving motor 4 crosses the pay-off axle connecting rod and is located its front side after stretching into from the rear end face of casing 6, correspondingly, crank 2 is located the front side of pay-off axle connecting rod, has avoided mechanical interference, has increased gauge needle angle regulation, and the interference can not all appear in the work of making up of the little gauge needle below the gauge needle 9mm and the big gauge needle more than 9mm, and application scope is wide.

As shown in fig. 2, the diameter D1 of the first mounting hole 11 is 7mm to 7.012mm, and the diameter D2 of the second mounting hole 12 is 8.5mm to 8.512 mm. In this embodiment, the diameter D1 of the first mounting hole 11 is preferably 7mm, and the diameter D2 of the second mounting hole 12 is preferably 8.5 mm. The utility model discloses a both ends that connecting rod 3 was provided with mounting hole one 11 and mounting hole two 12 are circular structure, and the circular structure on upper portion is concentric with the centre of a circle of mounting hole one 11, and its radius R1 is 6mm, and the circular structure of lower part is concentric with the centre of a circle of mounting hole two 11, and its radius R2 is 7 mm.

As shown in fig. 2 and 3, the front side surface of the connecting rod 3 is composed of a first side surface 18 and a second side surface 19 which are arranged up and down, a step surface 20 is formed between the first side surface 18 and the second side surface 19, the distance L2 from the first side surface 16 to the rear side surface is 3.9mm to 4.1mm, preferably L2 is 4mm in the embodiment, the distance L3 from the second side surface 17 to the rear side surface is 3.29mm to 3.31mm, preferably L3 is 3.3mm in the embodiment, the distance L4 from the step surface to the center of the second mounting hole is 24.9mm to 25.1mm, and preferably L4 is 25mm in the embodiment. When mounted, the front side of the connecting rod 3 is arranged facing the crank 2.

As shown in fig. 4, 5 and 6, one end of the crank 2 has a third mounting hole 21, a protrusion 22 extends outward from the end of the crank 3, the protrusion 22 of this embodiment is radially disposed along the third mounting hole 21, the protrusion 22 has an opening 23 communicating with the third mounting hole 21, the rotating shaft 8 of the driving motor 4 is inserted into the third mounting hole 21, a locking bolt 24 penetrating through the opening is screwed onto the protrusion 22, and the rotating shaft 8 of the driving motor 4 is fixed by the locking bolt 24 after being inserted into the third mounting hole 21; the other end of the crank 2 is provided with a mounting hole IV 25, the connecting pin 14 is inserted into the mounting hole IV 25, and the other end of the crank 2 is screwed with a fixing screw 26 which extends into the mounting hole IV 25 to fix the connecting pin 14; the center of the third mounting hole 21 and the center of the fourth mounting hole 25 are positioned on the center line 27 of the crank, and the center distance L5 between the third mounting hole 21 and the fourth mounting hole 25 is 35.9-36.1 mm. The preferred L5 for this embodiment is 36 mm.

Further, the center line 28 of the opening is perpendicular to the center line 27 of the crank, and the center of the mounting hole three 21 is located on the center line 28 of the opening. The gap L6 of the opening 23 is 1.6 mm. The aperture D3 of the mounting hole III 21 is 10 mm-10.012 mm; the diameter D4 of the mounting hole IV 25 is 7-7.012 mm. In this embodiment, the diameter D3 of the third mounting hole 21 is preferably 10mm, and the diameter D4 of the fourth mounting hole 25 is preferably 7 mm.

The utility model discloses when the installation, in knocking into the through-hole of casing 6 with skeleton oil blanket 9. The connecting pin 14 is inserted into the mounting hole three 21 of the crank 2 and locked with the fastening bolt 24. The connecting rod 3 is sleeved on a connecting rod pin 14 in a mounting hole IV 25 at the other end of the crank 2 and clamped into a clamp spring 15 to limit the connecting rod 3, parts such as a backstitch connecting rod, a crank, a needle distance seat and the like on the original machine are removed, a prepared connecting rod crank assembly is placed in the corresponding position of the machine shell 6, the other end of the connecting rod 3 is placed into an open slot 16 of the swinging seat 1 in the same way as the original connecting rod, and a newly manufactured connecting rod pin 17 is inserted to connect the connecting rod 3 with the swinging seat 1. The stepping motor is inserted into the machine shell 6 from the through hole of the machine shell 6 through the framework oil seal 9, the crank 2 is sleeved on the rotating shaft 8, the driving motor 4 is electrified to search for the zero position of the motor, the swinging seat 1 is rotated to search for the mechanical zero position, and then the locking bolt 22 of the crank 2 is locked. Therefore, the rotating shaft 8 of the driving motor 4 can rotate to drive the swinging seat 1 to rotate, thereby realizing the purpose of reverse and forward sewing.

In the present specification, the terms "upper", "lower", "left", "right", "middle" and "one" are used for convenience of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the corresponding parts may be changed or adjusted without substantial technical changes.

The above-mentioned embodiment is only one of the preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, so: all equivalent changes made according to the shape, structure and principle of the utility model are covered within the protection scope of the utility model.

Claims

1. A needle pitch adjusting and backstitch driving mechanism of a synchronous sewing machine comprises a swing seat (1), a crank (2), a connecting rod (3) and a driving motor (4), and is characterized in that the connecting rod (3) is a flat rod, a first mounting hole (11) and a second mounting hole (12) are respectively arranged at two ends of the connecting rod (3), centers of the first mounting hole (11) and the second mounting hole (12) are positioned on a central line (13) of the connecting rod, and the center distance L1 between the first mounting hole (11) and the second mounting hole (12) is 72.9-73.1 mm;

one end of the crank (2) is fixedly arranged on a rotating shaft (8) of the driving motor (4), the other end of the crank (2) is fixedly provided with a connecting pin (14), and one end of the connecting rod (3) is sleeved on the connecting pin (14) through a first mounting hole (11); the swing seat (1) is provided with an open slot (16), the other end of the connecting rod (3) is arranged in the open slot (16), the swing seat (1) is provided with a connecting rod pin (17) penetrating through the open slot (16), and the mounting hole II (12) at the other end of the connecting rod (3) is sleeved on the connecting rod pin (17) and is connected with the swing seat (1).

2. The mechanism as claimed in claim 1, wherein the aperture of the first mounting hole (11) is 7 mm-7.012 mm, and the aperture of the second mounting hole (12) is 8.5 mm-8.512 mm.

3. The needle pitch adjusting and backstitch driving mechanism of the synchronous sewing machine according to claim 1 or 2, characterized in that the front side of the connecting rod (3) is composed of a first side surface (18) and a second side surface (19) which are arranged up and down, a step surface (20) is formed between the first side surface (18) and the second side surface (19), the distance L2 from the first side surface (18) to the rear side surface is 3.9mm to 40.1mm, the distance L3 from the second side surface (19) to the rear side surface is 3.29mm to 3.31mm, and the distance L4 from the step surface to the center of the second mounting hole (12) is 24.9mm to 25.1 mm.

4. The needle pitch adjusting and backstitch driving mechanism of the synchronous sewing machine according to claim 1 or 2, characterized in that one end of the crank (2) is provided with a third mounting hole (21), a protrusion (22) extends outwards from the end of the crank (2), the protrusion (22) is provided with an opening (23) communicated with the third mounting hole (21), the rotating shaft (8) of the driving motor (4) is inserted into the third mounting hole (21), and the protrusion (22) is screwed with a locking bolt (24) penetrating through the opening (23); the other end of the crank (2) is provided with a mounting hole IV (25), the connecting pin (14) is inserted into the mounting hole IV (25), and the other end of the crank (2) is screwed with a fixing screw (26) which extends into the mounting hole IV (25) to fix the connecting pin (14); the center of the third mounting hole (21) and the center of the fourth mounting hole (25) are positioned on the center line (27) of the crank, and the center distance L5 between the third mounting hole (21) and the fourth mounting hole (25) is 35.9-36.1 mm.

5. A synchronous sewing machine gauge adjustment and backstitch drive mechanism according to claim 4, characterized in that the centre line (28) of the opening is perpendicular to the centre line (27) of the crank, and the centre of the mounting hole three (21) is located on the centre line (28) of the opening.

6. The mechanism for adjusting the needle pitch and driving the backstitch of the synchronous sewing machine as claimed in claim 4, wherein the aperture of the third mounting hole (21) is 10 mm-10.012 mm; the aperture of the mounting hole IV (25) is 7-7.012 mm.

7. A synchronous sewing machine gauge adjustment and backstitch drive mechanism according to claim 4, characterized in that the gap L6 of the opening (23) is 1.6 mm.

8. The needle pitch adjusting and backstitch driving mechanism of the synchronous sewing machine according to claim 1, characterized in that the driving motor (4) is installed on the rear end face of the machine shell (6), a through hole is arranged on the machine shell (6), and the through hole is used for processing a reaming hole (10) on the outer end part of a backstitch wrench shaft hole on the machine shell (6) or expanding the diameter of the backstitch wrench shaft hole; a rotating shaft (8) of the driving motor (4) penetrates through a through hole in the shell (6) to be connected with the crank (2), a framework oil seal (9) is arranged between the through hole and the rotating shaft (8) for sealing oil or/and a sealing element for sealing oil is arranged between the rear end face of the shell (6) and the installation end face of the driving motor (4).

9. The mechanism of claim 8, wherein the outer diameter of the frame oil seal (9) is 22mm, 21.5mm, 21mm, 20mm or 19 mm.

10. The needle pitch adjusting and backstitch driving mechanism of the synchronous sewing machine according to claim 1 or 8, wherein the driving motor (4) is a 86-frame stepping motor, and the size of the silicon steel sheet of the motor body is 85.9 mm-86.1 mm.