Stitch length adjusting mechanism for sewing machine and sewing machine

Abstract

The utility model provides a stitch gap adjusting mechanism of sewing machine and sewing machine, mainly solves the problem that conventional stitch gap adjusting is not stable and adopts crank drive, its characterized in that: including power source (1), provides power for mechanism, and it includes output shaft (11), swing seat (2), rotatable installation in sewing machine, and one end is connected with main shaft (91) of sewing machine, eccentric wheel (3), installs on output shaft, connecting rod (4), one end is connected with eccentric wheel, and the other end is hinged with swing seat, the utility model provides a stitch gap adjusting mechanism of sewing machine and sewing machine, realizes adjustment through power source and eccentric wheel and drives swing seat, and the structure is stable, further, can be controlled through stepping motor, is more favorable to automatic control.

Description

Technical Field

[0001] This utility model relates to the field of sewing equipment, specifically to a stitch gap adjustment mechanism for a sewing machine and a sewing machine. Background Technology

[0002] The upper differential structure on a sewing machine is a structure in which the feed dog and the upper differential presser foot feed together. It has the functions of preventing wrinkles and shrinking wrinkles, and is suitable for special sewing processes such as sewing cuffs.

[0003] Currently, most pin gap adjustment on the market is done manually using a pin spacing dial, which has low adjustment accuracy and a complex structure.

[0004] To address this, Chinese Patent No. CN 217266286 U discloses an adjustment structure that uses a crank-driven mechanism. However, crank transmission is unstable and may disengage. Utility Model Content

[0005] In order to overcome the shortcomings of the prior art, this utility model provides a stitch gap adjustment mechanism for a sewing machine and a sewing machine, which mainly solves the problem that conventional stitch gap adjustment uses crank transmission and is not stable.

[0006] The technical solution of this utility model is as follows: The stitch gap adjustment mechanism of the sewing machine includes A power source, which provides power to the mechanism, includes an output shaft; A swing seat is rotatably installed inside the sewing machine, with one end connected to the main shaft of the sewing machine; An eccentric wheel is mounted on the output shaft; The connecting rod is connected at one end to the eccentric wheel and at the other end to the swing seat.

[0007] The power source is a stepper motor.

[0008] The eccentric wheel is provided with a connecting sleeve, which is detachably connected to the output shaft.

[0009] The swing seat is connected to the sewing machine spindle via a second connecting rod.

[0010] The connecting sleeve is connected to the output shaft by fasteners.

[0011] The eccentric wheel includes a base plate, on which an eccentrically positioned boss is provided. One end of the connecting rod is provided with a connecting ring, which is sleeved on the circumferential outer wall of the boss.

[0012] The base plate is provided with a detachable cover plate, and the connecting ring is located between the cover plate and the base plate.

[0013] The cover plate is provided with a through hole for the drive shaft to pass through.

[0014] A sewing machine, including a housing on which a stitch gap adjustment mechanism as described above is mounted.

[0015] The housing contains a second power source and a transmission component driven by the second power source. The transmission component is used to drive the needle pitch adjustment mechanism, the movable presser foot assembly, and the thread cutting assembly.

[0016] The beneficial effects of this utility model are: This utility model provides a stitch gap adjustment mechanism for a sewing machine and a sewing machine, which achieves adjustment by driving the swing seat through a power source and an eccentric wheel, and the structure is stable; furthermore, it can be controlled by a stepper motor, which is more conducive to automated control. Attached Figure Description

[0017] Figure 1 This is a partial explosion diagram of one embodiment of the present invention.

[0018] Figure 2 This is a perspective view of one embodiment of the present invention.

[0019] Figure 3 This is a partial perspective view of a sewing machine according to an embodiment of the present invention.

[0020] Figure 4 This is a partial perspective view of a sewing machine according to an embodiment of the present invention.

[0021] Figure 5 This is a perspective view of a sewing machine according to an embodiment of the present invention. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings. The stitch gap adjustment mechanism of the sewing machine includes a power source 1, which provides power to the mechanism and includes an output shaft 11; a swing seat 2, which is rotatably installed inside the sewing machine and has one end connected to the main shaft 91 of the sewing machine; an eccentric wheel 3, which is installed on the output shaft; and a connecting rod 4, which has one end connected to the eccentric wheel and the other end hinged to the swing seat.

[0023] The principle of pin gap adjustment is existing technology, which can be found in Chinese Patent No. CN 217266286U. The feature of this application is that the torque output from the power source is transmitted to the eccentric wheel eccentrically mounted on the output shaft. The eccentric wheel drives the connecting rod, which in turn drives the swing seat. The overall structure is very stable, and when used with the preferred stepper motor, the control is precise. The swing seat also has a third connecting rod 28 that connects to the differential feed shaft 281. The differential feed shaft drives the differential feed teeth 282, which is existing technology and will not be described further.

[0024] In this embodiment, as shown in the figure, the power source is a stepper motor.

[0025] In this embodiment, as shown in the figure, a connecting sleeve 31 is provided on the eccentric wheel, and the connecting sleeve is detachably connected to the output shaft. The side wall of the connecting sleeve has mounting holes, allowing for easy installation using fasteners.

[0026] In this embodiment, as shown in the figure, the swing seat is connected to the sewing machine spindle via the second connecting rod 22.

[0027] In this embodiment, as shown in the figure, the connecting sleeve is connected to the output shaft by a fastener, such as a screw.

[0028] In this embodiment, as shown in the figure, the eccentric wheel includes a base plate 30, on which an eccentrically positioned boss 32 is provided. One end of the connecting rod is provided with a connecting ring 41, which is sleeved on the circumferential outer wall of the boss. The installation is secure and not easily dislodged.

[0029] In this embodiment, as shown in the figure, the base plate is provided with a detachable cover plate 33, and the connecting ring is located between the cover plate and the base plate. This allows for disassembly and replacement, reducing maintenance costs.

[0030] In this embodiment, as shown in the figure, the cover plate is provided with a through hole for the drive shaft to pass through.

[0031] In this embodiment, as shown in the figure, the sewing machine includes a housing 7, on which a stitch gap adjustment mechanism as described above for the sewing machine is installed.

[0032] In this embodiment, as shown in the figure, a second power source 51 and a transmission component driven by the second power source are installed inside the housing. The transmission component is used to drive the stitch length adjustment mechanism, the movable presser foot assembly, and the thread cutting assembly. The stitch length adjustment mechanism mentioned here is a common stitch length adjustment mechanism, and the stitch gap adjustment mechanism is an upper tooth adjustment structure, which are two sets of structures. This sewing machine can be driven by two stepper motors, making it more convenient for electronic control. The structure here can be referenced to Chinese Patent No. CN 217418980 U, which is also applied for by the applicant. The transmission component mentioned here is the transmission component of that document.

[0033] In the description of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0035] The embodiments described with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention. The embodiments should not be considered as limitations on the present invention, but any improvements made based on the spirit of the present invention should be within the protection scope of the present invention.

Claims

1. A stitch gap adjustment mechanism for a sewing machine, characterized in that: include A power source (1) provides power to the mechanism and includes an output shaft (11). The swing seat (2) is rotatably installed inside the sewing machine, and one end of it is connected to the main shaft (91) of the sewing machine; Eccentric wheel (3) is mounted on the output shaft; The connecting rod (4) is connected at one end to the eccentric wheel and at the other end to the swing seat.

2. The stitch difference adjustment mechanism for a sewing machine according to claim 1, characterized in that: The power source is a stepper motor.

3. The stitch gap adjustment mechanism for a sewing machine according to claim 1, characterized in that: The eccentric wheel is provided with a connecting sleeve (31), which is detachably connected to the output shaft.

4. The stitch gap adjustment mechanism for a sewing machine according to claim 1, characterized in that: The swing seat is connected to the sewing machine spindle via the second link (22).

5. The stitch gap adjustment mechanism for a sewing machine according to claim 3, characterized in that: The connecting sleeve is connected to the output shaft by fasteners.

6. The stitch gap adjustment mechanism for a sewing machine according to any one of claims 1-5, characterized in that: The eccentric wheel includes a base plate (30), on which an eccentrically positioned boss (32) is provided. One end of the connecting rod is provided with a connecting ring (41), which is sleeved on the circumferential outer wall of the boss.

7. The stitch gap adjustment mechanism for a sewing machine according to claim 6, characterized in that: The base plate is provided with a detachable cover plate (33), and the connecting ring is located between the cover plate and the base plate.

8. The stitch gap adjustment mechanism for a sewing machine according to claim 7, characterized in that: The cover plate is provided with a through hole for the drive shaft to pass through.

9. A sewing machine, including a housing (7), characterized in that: The housing is equipped with a stitch gap adjustment mechanism for a sewing machine as described in any one of claims 1-8.

10. The sewing machine according to claim 9, characterized in that: The housing contains a second power source (51) and a transmission component driven by the second power source. The transmission component is used to drive the needle pitch adjustment mechanism, the movable presser foot assembly, and the thread cutting assembly.

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