Differential feeding device on lockstitch sewing machine

Abstract

The utility model provides a differential feeding device on a lockstitch sewing machine, and belongs to the technical field of lockstitch sewing machines. The upper differential feeding device solves the problem that an external structure of the lockstitch sewing machine is loose and disordered due to an existing upper differential feeding device. The lockstitch sewing machine comprises a machine shell, the upper differential feeding device comprises a driver, a transmission structure and an upper feeding tooth, the driver is connected with the upper feeding tooth through the transmission structure, the back of the machine shell is provided with a frame-shaped installation frame which protrudes backwards, a front frame opening of the installation frame penetrates through the back of the machine shell, and a rear frame opening of the installation frame is blocked through a cover plate. The driver and the transmission structure are located in the machine shell and the installation frame. The differential feeding device on the lockstitch sewing machine has the advantage that the lockstitch sewing machine is compact in structure.

Description

Technical Field

[0001] The utility model belongs to the technical field of flat sewing machines and relates to a differential feeding device on a flat sewing machine. Background Technique

[0002] A flat sewing machine, also known as a straight sewing machine, is mainly used for straight stitching of various fabrics. The working principle of the flat sewing machine is that an electric motor drives the sewing needle to move up and down, and at the same time, it cooperates with the feed dog and the presser foot to convey the fabric. The bobbin and the bobbin case cooperate with each other to form a coil, and continuous stitches are formed by the interweaving of the sewing needle and the coil, so as to realize the stitching of the sewing cloth.

[0003] The existing differential feeding mechanism on a flat sewing machine, for example, a Chinese patent document discloses a differential feeding structure for a flat sewing machine [Patent No.: 202210786385.3; Application Publication No.: CN115094576A], which includes a housing, a motor and an upper feeding structure. The housing includes a machine head, a machine base and a cross beam. The motor is controlled by a computer and is arranged on the back side of the housing. There is a notch on the back side of the machine head. The upper feeding structure includes an upper feeding fork-shaped crank, an upper feeding front crank, an upper feeding swing shaft, an upper feeding swing rod, an upper tooth frame and an upper feeding tooth. The upper feeding structure passes through the notch out of the machine head and is connected to the driving shaft of the motor.

[0004] For the differential feeding structure of this kind of structure, the motor is arranged on the back side of the housing, and the protective cover is also arranged on the back side of the housing. Both the motor and the protective cover are exposed on the back side of the housing, and both the motor and the protective cover protrude from the back side of the housing, making the external structure of the flat sewing machine loose and chaotic. Summary of the Invention

[0005] The purpose of the utility model is to solve the above problems existing in the prior art, and proposes a differential feeding device on a flat sewing machine, and the technical problem to be solved is how to make the structure of the flat sewing machine compact.

[0006] The purpose of the utility model can be realized by the following technical solutions: A differential feeding device on a flat sewing machine, the flat sewing machine includes a machine shell, the upper differential feeding device includes a driver, a transmission structure and an upper feeding tooth. The driver is connected to the upper feeding tooth through the transmission structure. It is characterized in that the back of the machine shell has a mounting frame protruding backward in a frame shape. The front frame opening of the mounting frame penetrates the back of the machine shell, and the rear frame opening of the mounting frame is blocked by a cover plate. The driver and the transmission structure are located in the machine shell and the mounting frame.

[0007] The back of the machine housing protrudes rearward in a frame shape to form a mounting frame, which is sealed by a cover plate. The driver and the transmission structure are located in the machine housing and the mounting frame, and the driver and the transmission structure are not exposed, making the external structure of the lockstitch sewing machine neat and the structure of the lockstitch sewing machine compact. Moreover, since part of the driver and the transmission structure is located in the machine housing, the thickness of the mounting frame can be relatively thin, the distance that the mounting frame protrudes rearward can be relatively small, the overall sense of the machine housing is strong, and the structure of the lockstitch sewing machine is compact.

[0008] In the differential feeding device of a lockstitch sewing machine described above, the machine housing includes a cross beam in the middle, the mounting frame includes a first frame portion arranged in the horizontal direction, the first frame portion is fixedly connected to the cross beam, and the bottom of the first frame portion is flush with the bottom of the cross beam. There is an operation channel between the lower part of the head cross beam and the table board of the lockstitch sewing machine. The bottom of the first frame portion is flush with the bottom of the cross beam, so that the setting of the first frame portion will not affect the sewing operation of the operator.

[0009] In the differential feeding device of a lockstitch sewing machine described above, the driver is located in the cross beam and the first frame portion. This structure makes it convenient to install the driver while making the distance between the driver and the upper feed dog relatively close, making the length of the transmission structure shorter and making the layout of the transmission structure convenient.

[0010] In the differential feeding device of a lockstitch sewing machine described above, the machine housing further includes a machine head fixedly connected to the cross beam, the mounting frame includes a second frame portion arranged in the vertical direction, the second frame portion is fixedly connected to the machine head, and the bottom of the second frame portion is flush with the bottom of the machine head. This structure makes the setting of the second frame portion not affect the passing of the sewing cloth.

[0011] In the differential feeding device of a lockstitch sewing machine described above, the transmission structure is located in the machine head and the second frame portion. This structure makes the layout of the transmission structure reasonable.

[0012] In the differential feeding device of a lockstitch sewing machine described above, a mounting plate is fixedly connected in the mounting frame. The driver is fixedly connected to one side of the mounting plate through a fastener, and the output shaft of the driver passes through the mounting plate and is connected to the transmission structure. The setting of the mounting plate provides a mounting carrier, enabling the driver to be firmly installed in the mounting frame. The fastener is a bolt, which is convenient for fixing and can fine-tune the position of the driver, so that the transmission structure will not get stuck.

[0013] In the differential feeding device of a lockstitch sewing machine described above, the mounting plate is U-shaped, and the U-shaped opening of the mounting plate faces the cover plate. The driver is a motor. The U-shaped opening of the mounting plate faces the cover plate, which is convenient for the driver to be embedded into the mounting frame and makes the installation of the driver convenient.

[0014] In the differential feeding device of a flat sewing machine described above, the machine shell, the mounting frame and the mounting plate are of an integral structure. They can be integrally formed by casting, which is convenient for processing.

[0015] As another case, in the differential feeding device of a flat sewing machine described above, the mounting frame is fixedly connected to the machine shell by welding or the mounting frame is fixedly connected to the machine shell by fasteners.

[0016] In the differential feeding device of a flat sewing machine described above, the transmission structure includes a crank for fixedly connecting with the output shaft of the driver and a tooth difference for connecting with the upper feeding tooth. One end of the crank is provided with a needle roller bearing that is axially positioned and circumferentially rotatable. One end of the tooth difference has a sliding groove. The needle roller bearing is embedded in the sliding groove, and the needle roller bearing can move along the groove wall of the sliding groove.

[0017] Compared with the prior art, the differential feeding device of a flat sewing machine provided by the present utility model has the following advantages:

[0018] 1. The back of the machine shell protrudes rearward in a frame shape to form a mounting frame, which is sealed by a cover plate. The driver and the transmission structure are located in the machine shell and the mounting frame, and the driver and the transmission structure are not exposed, making the external structure of the flat sewing machine neat and the structure of the flat sewing machine compact.

[0019] 2. The driver and the transmission structure are partially located in the machine shell, so that the thickness of the mounting frame can be relatively thin, the distance that the mounting frame protrudes rearward can be relatively small, the overall sense of the machine shell is strong, and the structure of the flat sewing machine is compact. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of the external structure of this flat sewing machine.

[0021] Figure 2 is a schematic diagram of the layout structure of this upper differential feeding device.

[0022] Figure 3 is a schematic diagram of the structure of this driver arranged in the machine shell and the mounting frame.

[0023] Figure 4 is a schematic diagram of the layout structure of this machine shell and the mounting frame.

[0024] Figure 5 is a schematic diagram of the overall structure of this upper differential feeding device.

[0025] In the figure, 1 is the machine housing; 11 is the cross beam; 12 is the machine head; 2 is the driver; 3 is the transmission structure; 31 is the crank; 32 is the differential gear; 33 is the needle roller bearing; 34 is the sliding groove; 4 is the upper feed dog; 5 is the mounting frame; 51 is the front frame opening; 52 is the rear frame opening; 53 is the first frame part; 54 is the second frame part; 6 is the cover plate; 7 is the mounting plate. Detailed implementation mode

[0026] The following are specific embodiments of the present invention and in combination with the attached drawings, the technical solutions of the present invention will be further described, but the present invention is not limited to these embodiments.

[0027] As Figure 1 、 Figure 2 shown, the flat sewing machine includes a machine housing 1 and an upper differential feed device. The upper differential feed device includes a driver 2, a transmission structure 3 and an upper feed dog 4. The driver 2 is connected to the upper feed dog 4 through the transmission structure 3, and the driver 2 is a stepping motor.

[0028] The back of the machine housing 1 has a mounting frame 5 protruding rearward in a frame shape. The front frame opening 51 of the mounting frame 5 penetrates the back of the machine housing 1, and the rear frame opening 52 of the mounting frame 5 is blocked by a cover plate 6. The driver 2 and the transmission structure 3 are located in the machine housing 1 and the mounting frame 5.

[0029] Specifically, the machine housing 1 includes a cross beam 11 in the middle and a machine head 12 fixedly connected to the cross beam 11. The mounting frame 5 includes a first frame part 53 arranged in the horizontal direction and a second frame part 54 arranged in the vertical direction. The first frame part 53 is fixedly connected to the cross beam 11. As Figure 4 shown, the bottom of the first frame part 53 is flush with the bottom of the cross beam 11. As Figure 3 shown, the driver 2 is located in the cross beam 11 and the first frame part 53. The second frame part 54 is fixedly connected to the machine head 12, and the bottom of the second frame part 54 is flush with the bottom of the machine head 12. The transmission structure 3 is located in the machine head 12 and the second frame part 54.

[0030] A mounting plate 7 is fixedly connected in the mounting frame 5. The driver 2 is fixedly connected to one side of the mounting plate 7 through a fastener such as a bolt, and the output shaft of the driver 2 passes through the mounting plate 7 and is connected to the transmission structure 3. The mounting plate 7 is U-shaped, and the U-shaped opening of the mounting plate 7 faces the cover plate 6. In this embodiment, the machine housing 1, the mounting frame 5 and the mounting plate 7 are of an integral structure. In actual production, the mounting frame 5 is fixedly connected to the machine housing 1 by welding, or the mounting frame 5 is fixedly connected to the machine housing 1 through a fastener such as a bolt.

[0031] As Figure 5As shown in the figure, the transmission structure 3 includes a crank 31 for connecting with the output shaft of the driver 2 and a differential 32 for connecting with the upper feed dog 4. One end of the crank 31 is provided with a needle roller bearing 33 that is axially positioned and circumferentially rotatable. One end of the differential 32 has a sliding groove 34, and the needle roller bearing 33 is embedded in the sliding groove 34, and the needle roller bearing 33 can move along the groove wall of the sliding groove 34.

[0032] During assembly, the differential 32 is installed in the mounting frame 5, the crank 31 is fixedly connected to the output shaft of the driver 2, then the driver 2 is sent into the mounting frame 5 and fixedly connected to the mounting plate 7, and the needle roller bearing 33 on the crank 31 is embedded in the sliding groove 34 of the differential 32. Finally, the cover plate 6 is covered.

[0033] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar methods for substitution, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0034] Although terms such as the housing 1, cross beam 11, machine head 12, driver 2, transmission structure 3, crank 31, differential 32, needle roller bearing 33, sliding groove 34, upper feed dog 4, mounting frame 5, front frame opening 51, rear frame opening 52, first frame portion 53, second frame portion 54, cover plate 6, mounting plate 7, etc. are used more frequently in this article, the possibility of using other terms is not excluded. Using these terms is only for more convenient description and explanation of the essence of the present invention; interpreting them as any additional limitation is contrary to the spirit of the present invention.

Claims

1. A differential feeding device on a lockstitch sewing machine, the lockstitch sewing machine comprising a housing (1), the differential feeding device comprising a driver (2), a transmission structure (3) and an upper feed dog (4), the driver (2) being connected to the upper feed dog (4) via the transmission structure (3), characterized in that: The back of the housing (1) has a mounting frame (5) which is arranged in a frame shape and protrudes backwards; a front frame opening (51) of the mounting frame (5) passes through the back of the housing (1); a rear frame opening (52) of the mounting frame (5) is blocked by a cover plate (6); and the driver (2) and the transmission structure (3) are located in the housing (1) and the mounting frame (5).

2. A differential feeding device for a lockstitch sewing machine according to claim 1, characterized in that: The housing (1) comprises a crossbeam (11) located in the middle, and the mounting frame (5) comprises a first frame portion (53) arranged in a horizontal direction, the first frame portion (53) being fixedly connected to the crossbeam (11), and the bottom of the first frame portion (53) being flush with the bottom of the crossbeam (11).

3. A differential feeding device for a lockstitch sewing machine according to claim 2, characterized in that: The driver (2) is located in the crossbeam (11) and the first frame portion (53).

4. A differential feeding device for a lockstitch sewing machine according to claim 2, characterized in that: The housing (1) further comprises a machine head (12) fixedly connected to the crossbeam (11); the mounting frame (5) comprises a second frame portion (54) arranged in a vertical direction; the second frame portion (54) is fixedly connected to the machine head (12); and the bottom of the second frame portion (54) is flush with the bottom of the machine head (12).

5. A differential feeding device for a lockstitch sewing machine according to claim 4, characterized in that: The transmission structure (3) is located in the machine head (12) and the second frame part (54).

6. A differential feeding device for a lockstitch sewing machine according to any one of claims 1 to 5, characterized in that: A mounting plate (7) is fixedly connected to the mounting frame (5), the driver (2) is fixedly connected to one side of the mounting plate (7) via a fastener, and the output shaft of the driver (2) passes through the mounting plate (7) and is connected to the transmission structure (3).

7. A differential feeding device for a lockstitch sewing machine according to claim 6, characterized in that: The mounting plate (7) is U-shaped, and the U-shaped opening of the mounting plate (7) is arranged toward the cover plate (6).

8. A differential feeding device for a lockstitch sewing machine according to claim 6, characterized in that: The housing (1), the mounting frame (5) and the mounting plate (7) are an integrated structure.

9. A differential feeding device for a lockstitch sewing machine according to claim 6, characterized in that: The installation frame (5) is fixedly connected to the housing (1) by welding, or the installation frame (5) is fixedly connected to the housing (1) by fasteners.

10. A differential feeding device for a lockstitch sewing machine according to any one of claims 1 to 5, characterized in that: The transmission structure (3) comprises a crank (31) for being fixedly connected to the output shaft of the driver (2) and a tooth difference (32) for being connected to the upper feed tooth (4); one end of the crank (31) is provided with an axially positioned circumferentially rotatable needle bearing (33); one end of the tooth difference (32) has a sliding groove (34); the needle bearing (33) is embedded in the sliding groove (34), and the needle bearing (33) can move along the groove wall of the sliding groove (34).

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