CN210886494U

CN210886494U - Backstitch and stitch length adjusting driving mechanism of sewing machine

Info

Publication number: CN210886494U
Application number: CN201921851103.3U
Authority: CN
Inventors: 阮健明; 陈华正
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-10-30
Filing date: 2019-10-30
Publication date: 2020-06-30
Anticipated expiration: 2029-10-30

Abstract

The utility model belongs to the technical field of sewing equipment, in particular to a backstitch and stitch length adjusting driving mechanism of a sewing machine; the eccentric wheel comprises an eccentric wheel main body and a rotating shaft mounting hole positioned on the eccentric wheel main body, the eccentric wheel main body and the eccentric wheel hole are coaxially arranged, the rotating shaft mounting hole and the eccentric wheel main body are eccentrically arranged, and a rotating shaft of the motor is detachably fixed in the rotating shaft mounting hole of the eccentric wheel; the utility model discloses an all the time on a straight line between the pivot of motor and the one end of connecting rod, can compensate the defect of motor, the stability of the stitch seam when guaranteeing gauge length size adjustment precision and sewing.

Description

Backstitch and stitch length adjusting driving mechanism of sewing machine

The technical field is as follows:

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

Background art:

the swinging seat on the sewing machine is generally driven by a backstitch electromagnet, a backstitch wrench and a stitch gauge wheel disc on the mechanism, when the position of the swinging seat needs to be adjusted, the stitch gauge needs to be adjusted, and then the backstitch wrench or the electromagnet drives the swinging seat through a crank, a connecting rod and the like so as to finally realize the adjustment of the stitch gauge. Because the driving mode of the backstitch wrench needs manual operation, the efficiency is low; the electromagnet driving mode only has two states of attraction and separation, which can not continuously adjust the needle pitch and generate larger noise and shake in the process. Therefore, some sewing machines adopt motors to replace electromagnets for backstitch and stitch length adjustment. The motor can adopt a servo motor or a stepping motor. As shown in figure 1, the motor is arranged at a corresponding position of the sewing machine shell, a rotating shaft of the motor is connected with one end of the crank 1, the other end of the crank 1 is connected with one end of the connecting rod 3 through the connecting rod pin 2, and the other end of the connecting rod 3 is rotatably connected with one of the mounting arms on the swinging seat 5 through the pin shaft 4. When the swing seat works, the rotating shaft of the motor rotates to drive the crank 1 to rotate, then force is transmitted to the connecting rod pin 2, then the force is transmitted to the connecting rod 3, and finally the swing seat 4 is driven to swing.

The locking force of the motor is matched according to the current of the motor which is controlled by an electric controller, and when the current is large, the locking force is also increased. However, the larger the current is, the more the temperature of the motor rises, which affects heat dissipation. Because the rotating shaft, the connecting rod pin and the pin shaft of the motor in the structure form three points which are not on the same straight line, and because the locking force of the motor is limited, a lever force can be formed between the rotating shaft of the motor and the other end of the crank 1, when sewing, the condition of unstable stitches can be caused under the condition that the thicknesses of sewing materials are different, and the defect of poor accuracy of adjusting the stitch length can be caused during the adjustment of the stitch length.

The invention content is as follows:

the utility model aims at providing a can compensate poor defect of locking power of motor, backstitch and the gauge needle of sewing machine that the precision is high when guaranteeing that the stitch is stable, gauge needle when adjusting when sewing are adjusted to the gauge needle adjust actuating mechanism.

The utility model discloses a realize like this:

the utility model provides a backstitch and gauge needle of sewing machine adjust actuating mechanism, includes swing seat, motor, swing seat rotates with the one end of connecting rod to be connected, and the other end of connecting rod is provided with the eccentric wheel hole, and the eccentric wheel setting is downthehole at the eccentric wheel, the eccentric wheel includes the eccentric wheel main part and is located the pivot mounting hole in the eccentric wheel main part, eccentric wheel main part and eccentric wheel hole coaxial line set up, pivot mounting hole and eccentric wheel main part eccentric settings, the pivot detachably of motor is fixed in the pivot mounting hole of eccentric wheel.

In the backstitch and gauge needle adjustment driving mechanism of the sewing machine, the swing seat is of a U-shaped structure comprising two connecting arms, an open slot is formed in one of the connecting arms of the swing seat, one end of the connecting rod is inserted into the open slot and is rotatably connected into the open slot through a pin shaft, and the axis of the pin shaft is parallel to the axis of the rotating shaft mounting hole.

In the backstitch and gauge needle adjusting driving mechanism of the sewing machine, the swing seat is screwed with the fixing screw, and the lower end of the screw is tightly propped against the cylindrical surface of the pin shaft to fix the pin shaft on the swing seat.

In the backstitch and gauge needle adjusting driving mechanism of the sewing machine, the swinging seat is of a U-shaped structure comprising two connecting arms, a connecting pin is arranged on the outer side wall of one of the connecting arms of the swinging seat, the axis of the connecting pin is parallel to the axis of the rotating shaft mounting hole, and one end of the connecting rod is sleeved on the connecting pin.

In the backstitch and gauge adjustment driving mechanism of the sewing machine, one end of the connecting rod is limited by the clamp spring.

In the backstitch and gauge adjustment driving mechanism of a sewing machine, the eccentric wheel main body comprises a large diameter part and a small diameter part, the small diameter part is arranged in the eccentric wheel hole, and the diameter of the large diameter part is larger than that of the eccentric wheel hole.

In the backstitch and gauge adjustment driving mechanism of the sewing machine, a step surface is formed between the large-diameter part and the small-diameter part, and the step surface is attached to the corresponding side surface of the connecting rod.

In the backstitch and gauge needle adjustment driving mechanism of the sewing machine, the large-diameter part is provided with a threaded hole along the radial direction, and a rotating shaft of the motor is screwed in the threaded hole through a screw to realize fixation.

In the backstitch and gauge adjustment driving mechanism of the sewing machine, a cover plate is arranged on one side of the connecting rod opposite to the rotating shaft provided with the motor.

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

1. the utility model has the advantages that the rotating shaft of the motor and one end of the connecting rod are always on the same straight line, thereby compensating the defects of the motor and ensuring the adjustment precision of the needle pitch and the stability of the stitch during sewing (including the processes of backstitch, forward sewing and climbing);

2. the utility model discloses compact structure, the processing of being convenient for is applicable to on all flush joint machines.

Description of the drawings:

fig. 1 is a schematic diagram of the background art.

Fig. 2 is a perspective view of the present invention.

Fig. 3 is a schematic view of the eccentric wheel of the present invention disposed in the connecting rod.

Fig. 4 is a schematic view of the connecting rod of the present invention.

Fig. 5 is a schematic view of the eccentric wheel of the present invention.

In fig. 1: 1. a crank; 2. a link pin; 3. a connecting rod; 4. a pin shaft; 5. a swinging seat.

In FIGS. 2-5: 6. a swing seat; 7. a connecting rod; 8. an eccentric wheel hole; 9. an eccentric wheel; 10. a rotating shaft mounting hole; 11. a connecting arm; 12. an open slot; 13. a pin shaft; 14. a screw; 15. a large diameter portion; 16. a small diameter part; 17. a step surface; 18. a threaded bore.

The specific implementation mode is as follows:

the invention will now be further described with reference to specific embodiments, with reference to figures 2 to 5:

the utility model provides a backstitch and backstitch of sewing machine adjust actuating mechanism, includes swing seat 6, motor, swing seat 6 is the drive part that the backstitch was adjusted to the gauge needle, and gauge needle is adjusted and the backstitch mechanism is the conventional mechanism on the sewing machine, the utility model discloses do not do detailed description to gauge needle regulation and backstitch mechanism. The swing seat 6 is connected to the machine shell in a swing mode. Swing seat 6 rotates with the one end of connecting rod 7 and is connected, and the other end of connecting rod 7 is provided with eccentric wheel hole 8, and eccentric wheel 9 sets up in eccentric wheel hole 8, eccentric wheel 9 includes eccentric wheel main part and is located the pivot mounting hole 10 in the eccentric wheel main part, the eccentric wheel main part sets up with eccentric wheel hole 8 coaxial line, pivot mounting hole 10 and eccentric wheel main part eccentric settings, and specific eccentric position designs according to actual conditions. The rotating shaft of the motor is detachably fixed in the rotating shaft mounting hole 10 of the eccentric wheel 9. When the motor works, the rotating shaft drives the eccentric wheel 9 to rotate in the eccentric wheel hole 8, and then the connecting rod 7 is driven to act to drive the swinging seat 6 to swing.

The utility model discloses on a straight line all the time between the pivot of motor and the one end of connecting rod 7, can compensate the defect of motor, guarantee the regulation precision of gauge needle size, also can guarantee simultaneously that line mark is stable in backstitch, in the same direction as seam and climbing process.

Furthermore, the swing seat 6 is a U-shaped structure including two connecting arms 11, an open slot 12 is provided on one of the connecting arms 11 of the swing seat 6, one end of the connecting rod 7 is inserted into the open slot 12 and is rotatably connected in the open slot 12 through a pin 13, and an axis of the pin 13 is parallel to an axis of the rotating shaft mounting hole 10.

In order to fix the pin shaft 13, a screw 14 is screwed on the swing seat 6, and the lower end of the screw 14 abuts against the cylindrical surface of the pin shaft 13 to fix the pin shaft 13 on the swing seat 6.

The utility model discloses a connecting rod 7 can also be with swing seat 6's connection structure: the swing seat 6 is of a U-shaped structure comprising two connecting arms 11, a connecting pin is arranged on the outer side wall of one connecting arm 11 of the swing seat 6, the axis of the connecting pin is parallel to the axis of the rotating shaft mounting hole 10, and one end of the connecting rod 7 is sleeved on the connecting pin. One end of the connecting rod 7 is limited by the clamp spring.

As shown in fig. 4, the eccentric body includes a large diameter portion 15 and a small diameter portion 16, the small diameter portion 16 is disposed in the eccentric hole 8, and the diameter of the large diameter portion 15 is larger than that of the eccentric hole 8. When installed, the large diameter portion 15 is located outside the eccentric wheel hole 8.

Further, a step surface 17 is formed between the large diameter portion 15 and the small diameter portion 16, and the step surface 17 is attached to the corresponding side surface of the connecting rod 7.

In order to fix the rotating shaft of the motor to the eccentric wheel 9, a threaded hole 18 is radially arranged on the large diameter part 15, and the rotating shaft of the motor is screwed in the threaded hole 18 through a screw to be detachably fixed to the eccentric wheel 9. Of course, a spline and spline hole mode can be adopted, but the spline and spline hole mode has high requirements on machining precision, so that the cost is high, the production efficiency is reduced, and the screw fixing mode is preferred in the embodiment.

The utility model discloses set up the apron on connecting rod 7 with the pivot relative one side that is provided with the motor, the apron can also replace through the jump ring. When the clamp spring is used, the axial length of the small-diameter part is larger than that of the eccentric wheel hole.

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. The utility model provides a backstitch and gauge needle of sewing machine adjust actuating mechanism, includes swing seat (6), motor, its characterized in that: swing seat (6) are connected with the one end rotation of connecting rod (7), and the other end of connecting rod (7) is provided with eccentric wheel hole (8), and eccentric wheel (9) set up in eccentric wheel hole (8), eccentric wheel (9) include the eccentric wheel main part and lie in pivot mounting hole (10) in the eccentric wheel main part, the eccentric wheel main part sets up with eccentric wheel hole (8) coaxial line, pivot mounting hole (10) and eccentric wheel main part eccentric settings, the pivot detachably of motor is fixed in pivot mounting hole (10) of eccentric wheel (9).

2. The backstitch and gauge adjustment drive mechanism of a sewing machine according to claim 1, characterized in that: swing seat (6) are the U-shaped structure including two linking arms (11), are provided with open slot (12) on one of them linking arm (11) of swing seat (6), the one end of connecting rod (7) is inserted and is established in open slot (12) and rotate through round pin axle (13) and connect in open slot (12), the axis of round pin axle (13) is on a parallel with the axis of pivot mounting hole (10).

3. The backstitch and gauge adjustment drive mechanism of a sewing machine according to claim 2, characterized in that: the swing seat (6) is screwed with a screw (14), and the lower end of the screw (14) is tightly pressed against the cylindrical surface of the pin shaft (13) to fix the pin shaft (13) on the swing seat (6).

4. The backstitch and gauge adjustment drive mechanism of a sewing machine according to claim 1, characterized in that: the swing seat (6) is of a U-shaped structure comprising two connecting arms (11), a connecting pin is arranged on the outer side wall of one connecting arm (11) of the swing seat (6), the axis of the connecting pin is parallel to the axis of the rotating shaft mounting hole (10), and one end of the connecting rod (7) is sleeved on the connecting pin.

5. The backstitch and gauge adjustment drive mechanism of a sewing machine according to claim 4, characterized in that: one end of the connecting rod (7) is limited through the clamp spring.

6. The backstitch and gauge adjustment drive mechanism of a sewing machine according to claim 1, characterized in that: the eccentric wheel main body comprises a large-diameter part (15) and a small-diameter part (16), the small-diameter part (16) is arranged in the eccentric wheel hole (8), and the diameter of the large-diameter part (15) is larger than that of the eccentric wheel hole (8).

7. The backstitch and gauge adjustment drive mechanism of a sewing machine according to claim 6, characterized in that: a step surface (17) is formed between the large-diameter part (15) and the small-diameter part (16), and the step surface (17) is attached to the corresponding side surface of the connecting rod (7).

8. The backstitch and gauge adjustment drive mechanism of a sewing machine according to claim 6 or 7, characterized in that: the large-diameter part (15) is provided with a threaded hole (18) along the radial direction, and a rotating shaft of the motor is screwed in the threaded hole (18) through a screw to realize fixation.

9. The backstitch and gauge adjustment drive mechanism of a sewing machine according to claim 7, characterized in that: and a cover plate is arranged on one side of the connecting rod (7) opposite to the rotating shaft provided with the motor.