Automatic backstitch mechanism of sewing machine

Abstract

The automatic backstitch mechanism of the sewing machine comprises a sliding plate and a handle, the outer wall of the sliding plate is connected with the handle in a meshed mode, the bottom of the handle is connected with a clamping block in a clamped mode, a connecting block is fixedly installed at the bottom of one side of the handle, and the other side of the clamping block is fixedly connected with a pressurizing piece. And the pressurizing piece comprises a pipe a, a rod a and a spring a, the outer wall of the pipe a is fixedly connected with the other side of the clamping block, the rod a is movably sleeved with the pipe a, the outer wall of the rod a is movably sleeved with the spring a, and the bottom of the rod a is fixedly connected with a feeding plate. And when the feeding plate tilts, a spring a is extruded to form a rebound force, and the rebound force can be applied to the other side of the feeding plate, so that a clamping force is formed, and the working efficiency can be improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of sewing technology, and in particular relates to an automatic reverse stitching mechanism for a sewing machine. Background Art

[0002] A sewing machine is a machine that uses one or more sewing threads to form one or more stitches on the sewing material, so that one or more layers of sewing materials are interwoven or sewn together. The sewing machine can sew fabrics such as cotton, linen, silk, wool, and synthetic fibers, and products such as leather, plastic, and paper. The stitches are neat, beautiful, flat, and firm, and the sewing speed is fast and easy to use.

[0003] According to an automatic reverse stitch mechanism for a sewing machine disclosed in Chinese patent CN213113822U, a feed plate is provided on the lower surface of the sliding plate, a fixed plate is fixedly connected to the upper surface of the feed plate, a spring is fixedly connected to the upper surface of the feed plate, a movable column is passed through the front of the fixed plate and is rotatably connected, and a circumferential surface of the movable column passes through and is rotatably connected to the front of the sliding plate. In this automatic reverse stitch mechanism for a sewing machine, when the sliding of the slider drives the feed plate to move, the spring fixedly connected to the upper surface of the feed plate buffers it, so that the lower surface of the feed plate is more closely fitted to the fabric when it moves, and due to the arc structure of the wave buffer block, the fabric will not slide in a straight line on the surface of the workbench when it moves, which greatly reduces the friction of the fabric and effectively protects the quality of the fabric.

[0004] A spring is set on the top of the other side of the feed plate of the above patent, so that when the feed plate is tilted, the spring restoring force on one side will be smaller than the restoring force generated when the spring on the other side is squeezed. This makes it impossible to provide a stable force to press the fabric during work. At the same time, the spring of the above patent cannot be disassembled quickly. When working for a long time, a large amount of fluff will continue to accumulate on the surface of the spring, which cannot be cleaned in time. For this reason, we propose an automatic reverse stitching mechanism for a sewing machine. Utility Model Content

[0005] The purpose of the utility model is to provide an automatic reverse stitch mechanism for a sewing machine to solve the problem that a spring is set on the top of the other side of the feed plate of the above-mentioned patent in the above-mentioned background technology, so that when the feed plate is tilted, the spring restoring force on one side will be smaller than the restoring force generated when the spring on the other side is squeezed, which makes it impossible to provide a stable force during the work process to press the cloth, and at the same time, the above-mentioned patented spring cannot be quickly disassembled, and when it works for a long time, a large amount of fluff will continue to accumulate on the surface of the spring and cannot be cleaned in time.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an automatic reverse stitch mechanism for a sewing machine, comprising a sliding plate and a handle, the outer wall of the sliding plate meshingly connected to the handle, the bottom of the handle being clamped to a clamping block, a connecting block is fixedly installed on the bottom of one side of the handle, and a pressure piece is fixedly connected to the other side of the clamping block; the pressure piece comprises a tube a, a rod a, and a spring a, the outer wall of the tube a is fixedly connected to the other side of the clamping block, the inside of the tube a is movably sleeved with the rod a, the outer wall of the rod a is movably sleeved with the spring a, and the bottom of the rod a is fixedly connected to a feeding plate.

[0007] Preferably, the interior of the tube a includes a movement cavity and a limit plate. The movement cavity is opened inside the tube a. The limit plate is movably sleeved inside the movement cavity. The bottom of the limit plate is fixedly connected to the top of the rod a.

[0008] Preferably, the top of the connecting block is movably sleeved with a limit pin, the bottom of the limit pin is movably sleeved with a spring b, and the bottom outer wall of the limit pin is fixedly connected to the pull plate, and a slot is provided at the interval between the connecting block and the handle.

[0009] Preferably, the interior of the connection block comprises a top opening, an inner ring, and a sleeve opening. The top opening is opened inside the connection block, and the inner ring is fixedly installed inside the top opening.

[0010] Preferably, the interior of the limit pin includes a slope, a spring d, and a linkage rod. A slope is provided on one side of the limit pin. The bottom of the limit pin is fixedly installed with a linkage rod. The top of the linkage rod is movably sleeved with the spring d. The linkage rod and the sleeve are sleeved with each other, and the spring d and the top of the inner ring are in contact with each other.

[0011] Preferably, a rectangular opening is formed at the bottom of the handle, and the interior of the rectangular opening and the outer wall of the clamping block are clamped with each other.

[0012] Preferably, a limiting opening is provided at the bottom of one side of the tube a, the limiting opening and the outer wall of the rod a are movably sleeved, and the diameter of the limiting plate is twice the diameter of the limiting opening.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] 1. Through the designed pressure piece, an upper tube a is set on the top of the other side of the feeding plate. When it is tilted, a rebound force is formed by squeezing the spring a, which can be applied to the other side of the feeding plate, thereby forming a clamping force, so that both ends form a downward clamping force to press the cloth tightly.

[0015] 2. Through the designed limit pin, the card block can be quickly installed inside the rectangular opening by pressing, and the limit pin can play a limiting role. When cleaning is needed, just pull the bottom pull plate to cancel the limit pin and pull out the card block, which is convenient for cleaning and improves use efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the utility model;

[0017] Figure 2 For the utility model Figure 1 A schematic diagram of the enlarged structure at point A;

[0018] Figure 3 It is a schematic diagram of the two-dimensional structure of the sliding plate of the utility model;

[0019] Figure 4 This is a schematic diagram of the overall internal structure of the connection block of the utility model;

[0020] Figure 5 This is a schematic diagram of the overall internal structure of the tube a of the utility model;

[0021] Figure 6 It is a schematic diagram of the overall structure of the limit pin of the utility model.

[0022] In the figure: 1. sliding plate; 2. handle; 3. connecting block; 4. tube a; 5. rod a; 6. spring a; 7. clamping block; 8. feeding plate; 9. clamping groove; 10. limit pin; 11. pull plate; 12. spring b; 301. top opening; 302. inner ring; 303. sleeve; 401. moving cavity; 402. limit plate; 101. slope; 102. spring d; 103. linkage rod. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] See also Figure 1-6The utility model provides a technical solution: an automatic reverse stitching mechanism for a sewing machine, comprising a sliding plate 1 and a handle 2, the outer wall of the sliding plate 1 meshingly connected to the handle 2, the bottom of the handle 2 clamping a clamping block 7, a connecting block 3 is fixedly installed on the bottom of one side of the handle 2, and a pressure member is fixedly connected to the other side of the clamping block 7; the pressure member comprises a tube a4, a rod a5, and a spring a6, the outer wall of the tube a4 and the other side of the clamping block 7 are fixedly connected, the inside of the tube a4 movably sleeves the rod a5, the outer wall of the rod a5 movably sleeves the spring a6, the bottom of the rod a5 is fixedly connected to the feeding plate 8, the inside of the tube a4 comprises a moving cavity 401 and a limiting plate 402, the inside of the tube a4 opens a moving cavity 401, the inside of the moving cavity 401 movably sleeves the limiting plate 402, and the bottom of the limiting plate 402 is fixedly connected to the top of the rod a5.

[0025] In this embodiment, by setting the tube a4, when the other end is tilted during operation, the rod a5 will shrink toward the inside of the motion cavity 401. During the shrinkage process, the spring a6 squeezes and generates a rebound force, which can clamp the cloth tightly.

[0026] Specifically, the top of the connecting block 3 is movably sleeved with the limit pin 10, the bottom of the limit pin 10 is movably sleeved with the spring b12, and the bottom outer wall of the limit pin 10 is fixedly connected to the pull plate 11, a slot 9 is provided at the distance between the connecting block 3 and the handle 2, the interior of the connecting block 3 includes a top opening 301, an inner ring 302, and a sleeve opening 303, the interior of the connecting block 3 is provided with a top opening 301, the interior of the top opening 301 is fixedly installed with an inner ring 302, the interior of the inner ring 302 is provided with a sleeve opening 303, the interior of the limit pin 10 includes a slope 101, a spring d102, A slope 101 is provided on one side of the linkage rod 13 and the limit pin 10, the linkage rod 13 is fixedly installed at the bottom of the limit pin 10, the top of the linkage rod 13 is movably sleeved with the spring d102, the linkage rod 13 and the sleeve 303 are sleeved with each other, and the spring d102 and the top of the inner ring 302 fit each other, a rectangular opening is provided at the bottom of the handle 2, the inside of the rectangular opening and the outer wall of the clamping block 7 are clamped with each other, a limit opening is provided at the bottom of one side of the tube a4, the limit opening and the outer wall of the rod a5 are movably sleeved, and the diameter of the limit plate 402 is twice the diameter of the limit opening.

[0027] In this embodiment, when disassembly is required, it is only necessary to hold the outer wall of the pull plate 11 and pull it downward, so that the limiting force is cancelled. At this time, the clamping block 7 can be quickly disassembled and replaced, thereby improving the overall efficiency.

[0028] Working principle:

[0029] Step one, engage the outer wall of the clamping block 7 and the rectangular opening with each other, which makes the outer wall of the tube a4 fit with the slope 101. The slope 101 is sloped, so that the tube a4 can move forward to the top of the limit pin 10. When the tube a4 continues to be pushed, the tube a4 will form a downward force, causing the limit pin 10 to be extended into the interior of the connecting block 3. At that time, pushing the tube a4 forward can allow the tube a4 to move quickly to the side of the limit pin 10 to form a limit. When the tube a4 moves to the side, the spring d102 will push the limit pin 10 out, so that the limit pin 10 forms a limiting force, which can quickly install the clamping block 7 and the feeding plate 8 at the bottom of the handle 2.

[0030] Step two, when in operation, the bottom of the feed plate 8 will contact the cloth. When the other side of the feed plate 8 is tilted, the rod a5 will extend toward the inside of the tube a4. During the extension process, the spring a6 movably sleeved on the outer wall of the rod a5 will be squeezed. The rebound force of the spring a6 can form a downward clamping force on the other side of the feed plate 8, thereby enhancing stability and improving efficiency.

[0031] Step three, when disassembly is required, just hold the pull plate 11 and pull it downward to allow the limit pin 10 to move into the interior of the connecting block 3, and then pull the clamping block 7 outward to quickly disassemble the clamping block 7 and clean the surface fluff of the clamping block 7.

[0032] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An automatic reverse stitch mechanism for a sewing machine, comprising a sliding plate (1) and a handle (2), wherein the outer wall of the sliding plate (1) is engaged with the handle (2), and characterized in that: The bottom of the handle (2) is clamped with a clamping block (7), a connecting block (3) is fixedly mounted on the bottom of one side of the handle (2), and a pressure piece is fixedly connected to the other side of the clamping block (7); The pressurizing member comprises a tube a (4), a rod a (5), and a spring a (6); the outer wall of the tube a (4) is fixedly connected to the other side of the clamping block (7); the inside of the tube a (4) is movably connected to the rod a (5); the outer wall of the rod a (5) is movably connected to the spring a (6); and the bottom of the rod a (5) is fixedly connected to a feeding plate (8).

2. The automatic reverse stitching mechanism for a sewing machine according to claim 1, characterized in that: The interior of the tube a (4) includes a movement cavity (401) and a limit plate (402). The movement cavity (401) is opened inside the tube a (4). The limit plate (402) is movably sleeved inside the movement cavity (401). The bottom of the limit plate (402) is fixedly connected to the top of the rod a (5).

3. The automatic reverse stitching mechanism for a sewing machine according to claim 1, characterized in that: The top of the connection block (3) is movably sleeved with a limit pin (10), the bottom of the limit pin (10) is movably sleeved with a spring b (12), and the bottom outer wall of the limit pin (10) is fixedly connected to a pull plate (11), and a slot (9) is provided at the interval between the connection block (3) and the handle (2).

4. The automatic reverse stitching mechanism for a sewing machine according to claim 1, characterized in that: The interior of the connection block (3) comprises a top opening (301), an inner ring (302), and a sleeve opening (303); the top opening (301) is provided inside the connection block (3); the inner ring (302) is fixedly installed inside the top opening (301); and the sleeve opening (303) is provided inside the inner ring (302).

5. The automatic reverse stitching mechanism for a sewing machine according to claim 4, characterized in that: The interior of the limit pin (10) comprises a slope (101), a spring d (102), and a linkage rod (13); the slope (101) is provided on one side of the limit pin (10); the linkage rod (13) is fixedly installed at the bottom of the limit pin (10); the top of the linkage rod (13) is movably sleeved with the spring d (102); the linkage rod (13) and the sleeve (303) are sleeved with each other, and the top of the spring d (102) and the inner ring (302) are in contact with each other.

6. The automatic reverse stitching mechanism for a sewing machine according to claim 1, characterized in that: A rectangular opening is provided at the bottom of the handle (2), and the interior of the rectangular opening and the outer wall of the clamping block (7) are clamped together.

7. The automatic reverse stitching mechanism for a sewing machine according to claim 2, characterized in that: A limiting opening is provided at the bottom of one side of the tube a (4), the limiting opening and the outer wall of the rod a (5) are movably sleeved, and the diameter of the limiting plate (402) is twice the diameter of the limiting opening.

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