Automatic differential adjusting mechanism of overedger

Abstract

The utility model discloses an automatic differential adjusting mechanism of an overedger, which comprises a stepping motor arranged at the rear part of a sewing machine head, a power output shaft of the stepping motor is connected with a transmission screw rod, the transmission screw rod is provided with a transmission block capable of horizontally moving, and the transmission block is movably matched with a driving bearing on a differential connecting rod. According to the automatic differential adjusting mechanism, the working position of the differential connecting rod can be controlled in real time through the stepping motor, the differential value of the feed dog can be automatically adjusted in the sewing process, and cloth has the most appropriate tension degree in the sewing process.

Description

Technical Field

[0001] The utility model relates to the field of industrial sewing machines, in particular to an automatic differential adjustment mechanism of an overlock sewing machine. Background Art

[0002] The invention patent No. 202221989553.0 discloses a spacing adjustment mechanism for a feed dog on an overlock sewing machine, comprising an adjustment shaft installed in an overlock sewing machine base, one end of the adjustment shaft is connected to a fork-shaped piece, and the other end is connected to a fork-shaped piece.

[0003] The connecting plate is connected with an adjusting rod; the adjusting rod extends out of the top surface of the overlock machine base and is connected to the handle; the handle can be slidably installed in the handle slide groove of the handle locking plate. There are certain defects in the disclosure of this patent, and the differential value of the feed dog needs to be adjusted manually, and cannot be adjusted automatically during operation, which is inefficient and of low quality. Summary of the invention

[0004] The utility model aims at solving the above-mentioned technical problems and provides an automatic differential adjustment mechanism for an overlock sewing machine, which can automatically and real-time adjust the differential value of the feed dog according to sewing requirements during the sewing process, thereby improving the sewing quality.

[0005] The technical solution adopted by the utility model to solve the above technical problems is: an automatic differential adjustment mechanism of an overlock sewing machine, including a stepper motor installed at the rear of a sewing machine head, the power output shaft of the stepper motor is connected to a transmission screw, the transmission screw is provided with a transmission block that can move horizontally, and the transmission block is movably matched with a driving bearing on a differential connecting rod.

[0006] In order to optimize the above technical solution, the utility model also includes the following improved technical solution.

[0007] One end of the transmission screw is rotatably connected to the proximal support plate through a proximal support bearing, and the other end of the transmission screw is rotatably connected to the distal support plate through a distal support bearing. A transmission nut is mounted on the transmission screw, and the transmission nut is fixedly connected to the transmission block.

[0008] A track mounting plate is arranged at the rear of the sewing machine head, a guide track is fixedly mounted on the track mounting plate, the guide track is slidably connected with a guide slide block, and a transmission block is fixedly mounted on the guide slide block.

[0009] The upper end of the differential connecting rod is provided with a connecting rod, the inner ring of the driving bearing is fixedly connected to the differential connecting rod through the connecting rod, and the outer ring of the driving bearing is matched with the vertical groove of the transmission block.

[0010] Compared with the prior art, the automatic differential adjustment mechanism of the utility model can control the working position of the differential link in real time through a stepping motor, and can automatically adjust the differential value of the feed dog during the sewing process, so that the fabric has the most appropriate tension during sewing. Brief Description of the Drawings

[0011] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present utility model.

[0012] Figure 2 It is a schematic diagram of the three-dimensional structure of the present utility model.

[0013] Figure 3 is Figure 2 explosion schematic diagram. Detailed Description of the Preferred Embodiment

[0014] The following further describes in detail the embodiments of the present utility model with reference to the drawings.

[0015] Figures 1 to 3 The figure shows a schematic diagram of the structure of the present utility model.

[0016] The reference numerals therein are: track mounting plate 1, stepper motor 2, stepper motor mounting plate 3, proximal coupling 4, proximal support bearing 5, proximal support plate 6, origin sensor 7, drive nut 8, guide slider 9, drive screw 10, guide track 11, connecting rod 12, drive bearing 13, limit plate 14, differential link 15, drive block 16, distal support plate 17, distal support bearing 18.

[0017] The automatic differential adjustment mechanism of the present utility model for an overlock sewing machine includes a stepper motor 2 and a drive block 16. The stepper motor 2 drives the drive block 16 to move through a drive screw 10, and the drive block 16 drives the differential link 15 to move through a drive bearing 13. By the movement of the differential link 15, the differential value of the feed dog is adjusted.

[0018] As Figure 1 、 2 、3, a track mounting plate 1 is installed at the upper end of the rear part of the sewing head. The guide rail mounting plate is provided with a stepper motor 2 through a stepper motor mounting plate 3. One end of the drive screw 10 is fixedly connected to the stepper motor 2 through a proximal coupling 4. The drive screw 10 is rotatably connected to the proximal support plate 6 through a proximal support bearing 5. The other end of the drive screw 10 is rotatably connected to the distal support plate 17 through a distal support bearing 18. A drive nut 8 is installed on the drive screw 10, and the drive nut 8 is fixedly connected to the drive block 16. The drive screw 10 drives the drive block 16 to move through the drive nut 8. A guide track 11 is fixedly installed on the track mounting plate 1, and the guide track 11 is slidably connected to the guide slider 9. The drive block 16 is fixedly installed on the guide slider 9.

[0019] At the rear of the sewing head, there is a swingable differential link 15. The lower end of the differential link 15 is rotatably connected to a rotating shaft inside the sewing head, and the upper end of the differential link 15 is equipped with a connecting rod 12. A driving bearing 13 is installed on the connecting rod 12. The inner ring of the driving bearing 13 is fixedly connected to the differential link 15 through the connecting rod 12, and the outer ring of the driving bearing 13 is slidably connected to the vertical groove of the transmission block 16.

[0020] A limit plate 14 is installed on the track mounting plate 1, and there is an arc-shaped groove on the limit plate 14. The connecting rod 12 passes through the arc-shaped groove and can drive the differential link 15 to rotate along the arc-shaped groove of the limit plate 14.

[0021] The transmission screw 10 drives the transmission block 16 to move on the guide slider 9. The transmission block 16 drives the connecting rod 12 to move through the driving bearing 13, and the connecting rod 12 drives the differential link 15 to move to adjust the differential value.

[0022] This device also has the function of adjusting the zero point. An origin sensor 7 is installed on the proximal support plate 6. When the transmission block 16 slides, it is sensed by the origin sensor 7. The origin sensor 7 will record the point and limit the transmission block 16 and perform zeroing for the stepping motor 2.

[0023] When the overlock sewing machine is working, according to the requirements of fabric tension at different positions of the fabric, the differential value is adjusted in real time through the stepping motor 2, so that the fabric has different sewing effects at different positions, thereby improving the sewing quality.

[0024] The best embodiment of the present utility model has been illustrated, and various changes or modifications made by those of ordinary skill in the art will not depart from the scope of the present utility model.

Claims

1. An automatic differential adjustment mechanism for an overlock sewing machine, characterized in that: The invention comprises a stepper motor (2) installed at the rear of a sewing machine head, wherein the power output shaft of the stepper motor (2) is connected to a transmission screw (10), wherein the transmission screw (10) is provided with a transmission block (16) capable of horizontal movement, wherein the transmission block (16) is movably matched with a driving bearing (13) on a differential connecting rod (15); one end of the transmission screw (10) is rotationally connected to a proximal support plate (6) via a proximal support bearing (5), and the other end of the transmission screw (10) is rotationally connected to a distal support plate (17) via a distal support bearing (18); a transmission nut (8) is mounted on the transmission screw (10), and the transmission nut (8) is fixedly connected to the transmission block (16).

2. The automatic differential adjustment mechanism according to claim 1, characterized in that: A track mounting plate (1) is arranged at the rear of the sewing machine head, a guide track (11) is fixedly mounted on the track mounting plate (1), the guide track (11) is slidably connected to a guide slide block (9), and a transmission block (16) is fixedly mounted on the guide slide block (9).

3. The automatic differential adjustment mechanism according to claim 2, characterized in that: The upper end of the differential link (15) is provided with a connecting rod (12), the inner ring of the driving bearing (13) is fixedly connected to the differential link (15) via the connecting rod (12), and the outer ring of the driving bearing (13) is matched with the vertical groove of the transmission block (16).

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