CN210458553U

CN210458553U - Sewing machine and differential adjusting mechanism thereof

Info

Publication number: CN210458553U
Application number: CN201920980018.0U
Authority: CN
Inventors: 陈英杰; 颜文耀
Original assignee: Zhejiang Maqi Sewing Machine Co Ltd
Current assignee: Meiji Technology Group Co ltd
Priority date: 2019-06-27
Filing date: 2019-06-27
Publication date: 2020-05-05
Anticipated expiration: 2029-06-27

Abstract

The utility model belongs to the technical field of make up equipment, a sewing machine and differential adjustment mechanism thereof is related to, it has solved current sewing machine differential adjustment mechanism's structure complicacy, has adjusted inconvenient scheduling technical problem. The differential adjusting mechanism comprises a first rotating shaft, a first crank and a second crank, wherein one end of the first crank is fixedly connected with the first rotating shaft, the other end of the first crank is hinged with one end of the second crank, and the other end of the second crank is connected with a first cam; the differential adjusting mechanism further comprises a second rotating shaft and a third rotating shaft which are parallel to the first rotating shaft, a first transmission device capable of enabling the first rotating shaft and the second rotating shaft to synchronously rotate is arranged between the first rotating shaft and the second rotating shaft, a second transmission device capable of enabling the second rotating shaft and the third rotating shaft to synchronously rotate is arranged between the second rotating shaft and the third rotating shaft, and a driving device capable of driving the third rotating shaft to rotate is arranged on a shell of the sewing machine. The utility model has the advantages of adjust the precision height, can realize infinitely variable control, simple structure, installation regulation convenience.

Description

Sewing machine and differential adjusting mechanism thereof

Technical Field

The utility model belongs to the technical field of make up equipment, a sewing machine and differential adjustment mechanism thereof is related to.

Background

When the elastic cloth is overlock, an overlock machine with a differential feeding device is usually used for sewing, so that the working strength is reduced, and the working efficiency is improved. The differential feeding device of the existing sewing machine is generally as disclosed in patent 2006101179688, and comprises a power main shaft, a transmission shaft, a feeding tooth rack, feeding teeth fixed on the feeding tooth rack, differential teeth fixed on the differential tooth rack and the like, wherein the power main shaft drives the transmission shaft to rotate through the transmission mechanism, and the transmission shaft drives the feeding tooth rack and the feeding teeth to translate on a frame of the sewing machine through the feeding mechanism, so as to realize active cloth feeding; the transmission shaft drives the differential tooth rack and the differential tooth to move horizontally on the frame of the sewing machine through the differential mechanism, so that differential cloth feeding is realized.

The differential feeding device is easy to loose, so that the stitch is unstable. In order to solve the problem, the chinese patent CN 208136467U discloses a feeding and differential adjusting mechanism of a sewing machine, which comprises a main feeding mechanism and a differential feeding mechanism; the main feeding mechanism comprises a first needle pitch assembly, the first needle pitch assembly is connected to the main feeding tooth rack through a main transmission assembly, the differential feeding mechanism comprises a second needle pitch assembly, the second needle pitch assembly is installed on a power shaft and connected to the differential feeding tooth rack through a differential transmission assembly, and differential adjustment is achieved by changing the eccentric distance of a cam in the needle pitch assembly, so that the differential feeding mechanism is suitable for fabrics with different elasticity.

However, the above patents do not disclose how to adjust the eccentricity of the cam in the needle pitch assembly to achieve differential adjustment, but the prior art generally includes a positioning mechanism and an adjusting mechanism when adjusting the differential ratio, and the adjustment requires a large force, is achieved by means of a tool and two-hand operation, and is inconvenient to operate, low in adjustment precision, limited in adjustment range, complex in structure, and not beneficial to miniaturization and marketization of the sewing machine.

SUMMERY OF THE UTILITY MODEL

The utility model aims at having the above-mentioned problem to current technique, provided a sewing machine and differential adjustment mechanism thereof, the utility model aims to solve the technical problem that: how to simplify this differential adjustment mechanism improves the regulation convenience.

The purpose of the utility model can be realized by the following technical proposal:

a differential adjusting mechanism of a sewing machine comprises a first rotating shaft, a first crank and a second crank, wherein one end of the first crank is fixedly connected with the first rotating shaft, the other end of the first crank is hinged with one end of the second crank, and the other end of the second crank is connected with a first cam; the sewing machine is characterized by further comprising a second rotating shaft and a third rotating shaft which are parallel to the first rotating shaft, a first transmission device capable of enabling the first rotating shaft and the second rotating shaft to synchronously rotate is arranged between the first rotating shaft and the second rotating shaft, a second transmission device capable of enabling the second rotating shaft and the third rotating shaft to synchronously rotate is arranged between the second rotating shaft and the third rotating shaft, and a driving device capable of driving the third rotating shaft to rotate is arranged on a shell of the sewing machine.

The working principle is as follows: when the differential ratio needs to be adjusted, the driving device can drive the rotating shaft III to rotate, so that the transmission device II can drive the rotating shaft II to rotate around the axis of the transmission device II, then the transmission device I can drive the rotating shaft I to rotate around the axis of the transmission device I, the rotation of the rotating shaft I can drive the crank II and the crank I to swing in sequence, finally the eccentricity of the cam I is changed, and the adjustment of the differential ratio is achieved. Compared with the prior art, the differential adjusting mechanism does not need to have the positioning mechanism and the adjusting mechanism at the same time, has a simpler structure, can be adjusted by a single hand, and is more convenient and faster to operate.

In the differential adjustment mechanism of the sewing machine, as one scheme, the driving device includes a second cam rotatably disposed on the housing, and a side wall of the third rotating shaft has a abutting member connected or abutted to a tread of the second cam. During adjustment, the second cam can be rotated, so that the abutting part is jacked up to drive the third rotating shaft to rotate, and finally, the eccentricity adjustment of the first cam is realized through the second transmission device, the second rotating shaft, the first transmission device, the first rotating shaft, the second crank and the first crank in sequence.

In the differential adjusting mechanism of the sewing machine, the second cam is connected with an adjusting dial or an adjusting wrench. After the design has the regulation dial plate or adjusts the spanner, can further improve and adjust the convenience.

In the differential adjusting mechanism of the sewing machine, the abutting piece comprises a first swing screw fixed on the third rotating shaft.

In the differential adjusting mechanism of the sewing machine, a second swing screw is arranged on the side wall of the third rotating shaft. And a second swing screw is designed to be used as a fulcrum for installation of the torsion spring, so that the torsion spring is convenient to install.

In the differential adjustment mechanism of a sewing machine, a holding device which can enable the cam II to be always attached to the abutting piece when moving is further arranged between the abutting piece and the machine shell.

In the above differential adjusting mechanism of a sewing machine, the retaining device comprises a torsion spring sleeved on the third rotating shaft, one end of the torsion spring is connected with or attached to the machine shell, and the other end of the torsion spring is connected with or attached to the attaching part. The torsion spring can be used for enabling the leaning piece to be always leaned against the wheel surface of the second cam through the elasticity of the torsion spring, and meanwhile, the resetting effect can be achieved.

In the differential adjusting mechanism of the sewing machine, the first transmission device comprises a third crank, a fourth crank, a fifth crank and a sixth crank, the third crank and the fourth crank are respectively fixed on the first rotating shaft and the second rotating shaft, the third crank and the fourth crank are respectively provided with a first sliding chute and a second sliding chute, the first sliding chute and the second sliding chute are respectively provided with a first sliding block and a second sliding block in a sliding manner, the first sliding block and the second sliding block are connected through a first connecting pin, one end of the fifth crank is connected with the first sliding block, the other end of the fifth crank is connected with one end of the sixth crank through a second connecting pin, and the other end of the sixth crank is fixed on the second rotating shaft. The rotation of the second rotating shaft can drive the sixth crank to swing, so that the fifth crank is driven to swing, the third crank is driven to swing through the action of the first connecting pin, then the first rotating shaft is driven to swing, and finally the first cam is driven to move through the transmission of the second crank and the first crank to realize the adjustment of the differential ratio.

In the differential adjusting mechanism of the sewing machine, the second transmission device comprises two gears respectively fixed on the second rotating shaft and the third rotating shaft, and the two gears are meshed with each other. The rotation of the third rotating shaft can drive the second rotating shaft to rotate through the matching of the two gears. The gear transmission mode is matched with the cam for adjustment, so that the adjustment precision is higher, and stepless adjustment can be realized.

The sewing machine is characterized by comprising the differential adjusting mechanism.

Compared with the prior art, the utility model has the advantages of it is following:

this differential adjustment mechanism need not to have positioning mechanism and adjustment mechanism concurrently simultaneously, and the structure is more simple, and occupation space is little, and simple to operate is laborsaving, and the accessible one-hand regulation, and the operation is more convenient and fast, and adopts gear drive's mode cooperation cam to adjust, and its regulation precision is higher, and can realize infinitely variable control.

Drawings

Fig. 1 is a schematic view of the differential adjustment mechanism from one of its viewing angles.

Fig. 2 is a schematic view of the differential adjusting mechanism from another perspective.

Fig. 3 is a schematic structural diagram of a first transmission device.

In the figure, 1, a first rotating shaft; 2. a first crank; 3. a crank II; 4. a first cam; 5. a second rotating shaft; 6. a rotating shaft III; 7. a first transmission device; 8. a second transmission device; 9. a drive device; 10. a second cam; 11. an abutting member; 12. a second swing screw; 13. a torsion spring; 14. a third crank; 15. a crank IV; 16. a fifth crank; 17. a crank six; 18. a first sliding chute; 19. a second chute; 20. a first sliding block; 21. a second sliding block; 22. a first connecting pin; 23. a second connecting pin; 24. a gear.

Detailed Description

The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

As shown in fig. 1, 2 and 3, the differential adjusting mechanism comprises a rotating shaft I1, a crank I2 and a crank II 3, wherein one end of the crank I2 is fixedly connected with the rotating shaft I1, the other end of the crank I2 is hinged with one end of the crank II 3, and the other end of the crank II 3 is connected with a cam I4; the differential adjusting mechanism further comprises a second rotating shaft 5 and a third rotating shaft 6 which are parallel to the first rotating shaft 1, a first transmission device 7 which can enable the first rotating shaft 1 and the second rotating shaft 5 to synchronously rotate is arranged between the first rotating shaft 1 and the second rotating shaft 5, a second transmission device 8 which can enable the second rotating shaft 5 and the third rotating shaft 6 to synchronously rotate is arranged between the second rotating shaft 5 and the third rotating shaft 6, and a driving device 9 which can drive the third rotating shaft 6 to rotate is arranged on a shell of the sewing machine.

Specifically, in the present embodiment, the driving device 9 includes a second cam 10 rotatably disposed on the housing, and the side wall of the third rotating shaft 6 has an abutting member 11 connected to or abutting against the tread of the second cam 10. Preferably, the abutting member 11 includes a first swing screw fixed on the third rotating shaft 6, but the abutting member 11 may also adopt various modes such as a boss, a pin, a ball and the like as other schemes. And a second swing screw 12 is arranged on the side wall of the third rotating shaft 6.

It should be noted that in the drawings of the present application, the second cam 10 is an outer cam, but as another scheme, the second cam 10 may also be designed as an inner cam, and the abutting member may be designed in the form of a pin or a ball, and is movably connected with the inner contour of the inner cam.

In order to ensure the stability and the reset during the adjustment, a retaining device which can enable the cam II 10 to be always abutted with the abutting piece 11 when moving is further arranged between the abutting piece 11 and the machine shell. In this embodiment, the retaining device includes a torsion spring 13 sleeved on the third rotating shaft 6, one end of the torsion spring 13 is connected to or attached to the housing, and the other end of the torsion spring 13 is connected to or attached to the abutting member 11. And for the convenience of adjustment, the second cam 10 can be further connected with an adjusting dial or an adjusting wrench.

As shown in fig. 3, in this embodiment, the first transmission device 7 includes a third crank 14, a fourth crank 15, a fifth crank 16, and a sixth crank 17, the third crank 14 and the fourth crank 15 are respectively fixed to the first rotating shaft 1 and the second rotating shaft 5, the third crank 14 and the fourth crank 15 are respectively provided with a first sliding slot 18 and a second sliding slot 19, the first sliding slot 18 and the second sliding slot 19 are respectively provided with a first slider 20 and a second slider 21 in a sliding manner, the first slider 20 and the second slider 21 are connected by a first connecting pin 22, one end of the fifth crank 16 is connected with the first slider 20, the other end of the fifth crank 16 is connected with one end of the sixth crank 17 by a second connecting pin 23, and the other end of the sixth crank 17 is fixed to the second rotating shaft 5. Preferably, the moving direction of the crank third 14 is the horizontal direction of the rotating shaft second 5, and the rotating shaft first 1 can be adjusted by changing the sliding groove first 18 or the crank fifth 16 on the crank third 14.

It should be noted that, although the first sliding groove 18 and the second sliding groove 19 in the drawings are in a groove shape and an opening shape, the first sliding groove 18 and the second sliding groove 19 are not limited to this shape, as long as they can be slidably engaged with each other. The first connecting pin 22 and the second connecting pin 23 can be replaced by other connecting pieces. The first sliding block 20 and the second sliding block 21 can be replaced by a rolling pin or other parts as long as the sliding in the corresponding first sliding groove 18 and the second sliding groove 19 can be realized. The first sliding block 20, the second sliding block 21 and the fifth crank 16 can be connected integrally or separately and fixed through connecting pieces.

As shown in fig. 1, the second transmission device 8 includes two gears 24 fixed to the second rotating shaft 5 and the third rotating shaft 6, respectively, and the two gears 24 are engaged with each other. As another scheme, the second transmission device 8 may also be implemented by various manners such as a cam and a link mechanism, as long as the transmission between the two can be implemented.

The utility model also provides a sewing machine of including above-mentioned differential adjustment mechanism.

The working principle of the utility model is as follows: when the differential ratio needs to be adjusted, the second cam 10 can be rotated, so that the abutting part 11 is jacked up to drive the third rotating shaft 6 to rotate, the second rotating shaft 5 is driven to rotate through the cooperation between the two gears 24, the second rotating shaft 5 can be driven to rotate, the sixth crank 17 can be driven to swing, the fifth crank 16 is driven to swing, the third crank 14 is driven to swing through the action of the first connecting pin 22, then the first rotating shaft 1 is driven to swing, and finally the first cam 4 is driven to move through the transmission of the second crank 3 and the first crank 2 to realize the adjustment of the differential ratio.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims

1. A differential adjusting mechanism of a sewing machine comprises a first rotating shaft (1), a first crank (2) and a second crank (3), wherein one end of the first crank (2) is fixedly connected with the first rotating shaft (1), the other end of the first crank (2) is hinged with one end of the second crank (3), and the other end of the second crank (3) is connected with a first cam (4); the sewing machine differential adjusting mechanism is characterized by further comprising a second rotating shaft (5) and a third rotating shaft (6) which are parallel to the first rotating shaft (1), a first transmission device (7) capable of enabling the first rotating shaft (1) and the second rotating shaft (5) to synchronously rotate is arranged between the first rotating shaft (1) and the second rotating shaft (5), a second transmission device (8) capable of enabling the second rotating shaft (5) and the third rotating shaft (6) to synchronously rotate is arranged between the second rotating shaft (5) and the third rotating shaft (6), and a driving device (9) capable of driving the third rotating shaft (6) to rotate is arranged on a shell of.

2. Differential adjustment mechanism for a sewing machine according to claim 1, characterized in that the drive means (9) comprise a second cam (10) rotatably mounted on the machine housing, the third shaft (6) having on its lateral wall an abutment (11) connected to or abutting against the tread of the second cam (10).

3. Differential adjustment mechanism of a sewing machine according to claim 2, characterized in that the second cam (10) is connected with an adjustment dial or an adjustment wrench.

4. Differential adjustment mechanism of a sewing machine according to claim 2, characterized in that said abutment (11) comprises a first oscillating screw fixed to said third shaft (6).

5. Differential adjustment mechanism of a sewing machine according to claim 2, characterized in that a second swing screw (12) is provided on the side wall of the third shaft (6).

6. Differential adjustment mechanism for sewing machines according to claim 2, characterized in that between the abutment (11) and the machine housing there are also provided retaining means enabling the second cam (10) to always abut against the abutment (11) when it moves.

7. The differential adjustment mechanism of sewing machine according to claim 6, characterized in that the retaining device comprises a torsion spring (13) sleeved on the third rotating shaft (6), one end of the torsion spring (13) is connected or attached to the machine case, and the other end of the torsion spring (13) is connected or attached to the attachment (11).

8. The differential adjusting mechanism of the sewing machine according to claim 1, 2, 3, 4, 5, 6 or 7, characterized in that the first transmission device (7) comprises a third crank (14), a fourth crank (15), a fifth crank (16) and a sixth crank (17), the third crank (14) and the fourth crank (15) are respectively fixed on the first rotating shaft (1) and the second rotating shaft (5), the third crank (14) and the fourth crank (15) are respectively provided with a first sliding chute (18) and a second sliding chute (19), the first sliding chute (18) and the second sliding chute (19) are respectively provided with a first sliding block (20) and a second sliding block (21) in a sliding manner, the first sliding block (20) and the second sliding block (21) are connected through a first connecting pin (22), one end of the fifth crank (16) is connected with the first sliding block (20), and the other end of the fifth crank (16) is connected with one end of the sixth crank (17) through a second connecting pin (23), the other end of the crank six (17) is fixed on the rotating shaft two (5).

9. Differential adjustment mechanism of a sewing machine according to claim 1 or 2 or 3 or 4 or 5 or 6 or 7, characterized in that the second transmission (8) comprises two gears (24) fixed to the second and third shafts (5, 6), respectively, and the two gears (24) are engaged with each other.

10. A sewing machine characterized in that it comprises a differential adjustment mechanism according to any one of claims 1 to 8.