Stitch length adjusting device of sewing machine

Abstract

The utility model relates to a stitch length adjusting device of a sewing machine, which belongs to the technical field of sewing machines and comprises a working bottom plate, a sewing machine casing and a sewing machine needle head, the sewing machine casing is fixedly connected to the top of the working bottom plate, and the sewing machine needle head is fixedly mounted on the sewing machine casing. A stitch length adjusting knob used for adjusting stitch length is rotatably mounted on the sewing machine needle head, a driving gear is fixedly mounted on the stitch length adjusting knob, a driving rack is arranged on one side of the driving gear, a right-angle driving rod is connected to the outer side wall of the driving rack, and a miniature electric telescopic rod is fixedly mounted at the top of one end of the right-angle driving rod. According to the sewing machine needle pitch adjusting device, the needle pitch adjusting knob can be controlled to rotate in an electric mode, if the electric control mode breaks down, the manual mode can be conveniently used, and therefore the sewing machine needle pitch adjusting device is convenient to use and high in practicability. And the needle pitch adjusting knob can be limited and prevented from rotating by adopting a manual control mode.

Description

Technical Field

[0001] The utility model relates to the technical field of sewing machines, in particular to a needle distance adjusting device for sewing machines. Background Art

[0002] A sewing machine is a machine used to sew fabrics. It uses one or more sewing threads to form one or more stitches on the sewing material, so that one or more layers of sewing material are interwoven or sewn together. The sewing machine can sew various fabrics, such as cotton, linen, silk, wool, synthetic fibers, etc., as well as leather, plastic, paper and other products. In addition, the sewing machine can adjust the stitch length and stitches as needed, and is very convenient to use. It has multiple functions, such as sewing, locking edges, buttoning, embroidery, etc., and is widely used in various industries such as clothing, home furnishings, and automobiles. With the development of science and technology, sewing machines have gradually evolved from traditional manual or foot-operated sewing machines to electric and CNC sewing machines, greatly improving production efficiency and processing accuracy.

[0003] When adjusting the stitch length of a sewing machine, the user only needs to manually turn the stitch length adjustment knob. During the sewing process, if the stitch length is too small, the fabric will be punctured or wrinkled; if the stitch length is too large, the sewing seams will be uneven or loose. Therefore, by adjusting the stitch length, the sewing machine can adapt to different fabrics and sewing requirements. Since the stitch length adjustment knob needs to be manually operated, it is relatively inconvenient, and after manual adjustment, it is not convenient to limit the stitch length adjustment knob. Utility Model Content

[0004] In order to overcome the technical defects of the prior art, the utility model provides a sewing machine needle distance adjusting device.

[0005] The technical solution adopted by the utility model is as follows: it includes a working base plate, a sewing machine casing and a sewing machine needle, the sewing machine casing is fixedly connected to the top of the working base plate, the sewing machine needle is fixedly installed on the sewing machine casing, a stitch adjustment knob for adjusting the stitch length is rotatably installed on the sewing machine needle, a driving gear is fixedly installed on the stitch adjustment knob, a driving rack is provided on one side of the driving gear, a right-angle driving rod is connected to the outer side wall of the driving rack, a micro-electric telescopic rod is fixedly installed on the top of one end of the right-angle driving rod, a detachable fixing component for positioning the micro-electric telescopic rod is installed on the outer side wall of one side of the sewing machine casing, a positioning disk is fixedly installed on the stitch adjustment knob, and a manual limiting component for fixing the positioning disk is installed on the top of the sewing machine casing.

[0006] Preferably, in order to enable the L-shaped through-plate to be used in conjunction with the side mounting block, the easily detachable fixing assembly includes a side mounting block, which is fixedly mounted on the outer wall of one side of the sewing machine housing, and the side mounting block is provided with a mounting through-hole, in which the L-shaped through-plate is passed.

[0007] Preferably, in order to drive the extrusion fixing block to move by the pull rod, one end of the micro electric telescopic rod is fixedly mounted on the L-shaped through-plate, a through hole is provided on one end of the side mounting block, a pull rod is passed through the through hole, an extrusion fixing block is installed on one end of the pull rod, and the extrusion fixing block is arranged on one side of the L-shaped through-plate.

[0008] Preferably, in order to enable the extrusion fixing block to extrude and fix the L-shaped through plate through the extrusion spring, an operating handle is fixedly installed on one end of the pull rod, an extrusion spring is fixedly installed on the inner side wall of the operating handle, and one end of the extrusion spring is fixedly installed on the outer side wall of the side mounting block.

[0009] Preferably, in order to enable the positioning screw to spirally rotate on the top connecting seat, the manual limiting assembly includes a top connecting seat, which is installed on the top of the sewing machine housing through a fixing bolt, and a threaded hole is provided on the top connecting seat, in which the positioning screw is screwed.

[0010] Preferably, in order to drive the arc-shaped positioning block to rise or fall through the rotating sleeve, a non-slip handle is fixedly installed on the top of the positioning screw, a rotating sleeve is rotatably installed on the bottom of the positioning screw, and an arc-shaped positioning block is fixedly installed on the bottom of the rotating sleeve.

[0011] Preferably, in order to prevent the arc-shaped positioning block from being offset by the limiting slider, a side limiting groove is provided on the sewing machine housing, and a limiting slider is slidably installed in the side limiting groove, and one end of the limiting slider is fixedly installed on the arc-shaped positioning block.

[0012] Preferably, in order to enable the driving gear and the stitch adjustment knob to rotate synchronously when the driving rack is displaced, the driving gear is meshed with the driving rack.

[0013] The beneficial effects of the utility model are:

[0014] The utility model is provided with a micro electric telescopic rod, a driving rack, a detachable fixing assembly and a manual limiting assembly. When the micro electric telescopic rod is in operation, it can drive the driving rack to move, so that the stitch length adjustment knob can be rotated. After the stitch length adjustment knob is rotated, the stitch length of the sewing machine needle can be adjusted. If the electric control mode fails, the micro electric telescopic rod and the driving rack can be conveniently disassembled by the detachable fixing assembly, and then the stitch length adjustment knob can be rotated manually. In addition, when manual operation is performed, the stitch length adjustment knob can be limited by the manual limiting assembly to ensure that the stitch length will not be accidentally changed during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0016] Figure 2 This is a schematic diagram of the overall structure of the utility model from another angle.

[0017] Figure 3 This is a schematic diagram of the installation of the needle length adjustment knob in the present invention.

[0018] Figure 4 It is a structural diagram of the manual limiting component in the utility model.

[0019] Figure 5 This is a schematic diagram of the installation of the micro electric telescopic rod in the utility model.

[0020] Figure 6 It is an exploded schematic diagram of the L-shaped through-plate and the side mounting block in the knot of the present invention.

[0021] Explanation of the accompanying drawings: In the figure: 1. working base plate; 2. sewing machine housing; 3. sewing machine needle; 4. stitch adjustment knob; 5. driving gear; 6. driving rack; 7. right-angle driving rod; 8. micro electric telescopic rod; 9. positioning plate; 10. side mounting block; 11. L-shaped through-plate; 12. pull rod; 13. extrusion fixing block; 14. operating handle; 15. extrusion spring; 16. top connecting seat; 17. positioning screw; 18. anti-slip handle; 19. rotating sleeve; 20. arc-shaped positioning block; 21. side limit groove; 22. limit slider. DETAILED DESCRIPTION

[0022] The present invention will be further described below with reference to the accompanying drawings:

[0023] like Figure 1-6 As shown, this embodiment provides a sewing machine needle distance adjustment device.

[0024] The machine comprises a working base plate 1, a sewing machine casing 2 and a sewing machine needle 3. The sewing machine casing 2 is fixedly connected to the top of the working base plate 1, the sewing machine needle 3 is fixedly mounted on the sewing machine casing 2, a stitch adjustment knob 4 for adjusting the stitch length is rotatably mounted on the sewing machine needle 3, a driving gear 5 is fixedly mounted on the stitch adjustment knob 4, a driving rack 6 is provided on one side of the driving gear 5, a right-angle driving rod 7 is connected to the outer wall of the driving rack 6, a micro-electric telescopic rod 8 is fixedly mounted on the top of one end of the right-angle driving rod 7, the micro-electric telescopic rod 8 can cause the right-angle driving rod 7 and the driving rack 6 to be displaced, so that the driving gear 5 and the stitch adjustment knob 4 can be rotated, a detachable fixing component for positioning the micro-electric telescopic rod 8 is installed on the outer wall of one side of the sewing machine casing 2, a positioning disk 9 is fixedly mounted on the stitch adjustment knob 4, and a manual limiting component for fixing the positioning disk 9 is installed on the top of the sewing machine casing 2.

[0025] The easily detachable fixing component includes a side mounting block 10, which is fixedly mounted on the outer side wall of one side of the sewing machine casing 2. The side mounting block 10 is provided with a mounting through-hole, and an L-shaped through-plate 11 is passed through the mounting through-hole. One end of the micro electric telescopic rod 8 is fixedly mounted on the L-shaped through-plate 11. A through-hole is provided on one end of the side mounting block 10, and a pull rod 12 is passed through the through-hole. An extrusion fixing block 13 is installed on one end of the pull rod 12. The extrusion fixing block 13 is arranged on one side of the L-shaped through-plate 11, and an operating handle 14 is fixedly mounted on one end of the pull rod 12. An extrusion spring 15 is fixedly mounted on the inner side wall of the operating handle 14, and one end of the extrusion spring 15 is fixedly mounted on the outer side wall of the side mounting block 10. The extrusion fixing block 13 can be squeezed and fixed to the L-shaped through-plate 11 by the extrusion spring 15, so that the micro electric telescopic rod 8 can also be fixed. The L-shaped through-plate 11 and the micro electric telescopic rod 8 are an integrated structure.

[0026] The manual limit assembly includes a top connecting seat 16, which is mounted on the top of the sewing machine casing 2 by a fixing bolt. A threaded hole is provided on the top connecting seat 16, and a positioning screw 17 is screwed into the threaded hole. A non-slip handle 18 is fixedly installed on the top of the positioning screw 17. A rotating sleeve 19 is rotatably installed at the bottom of the positioning screw 17, and an arc-shaped positioning block 20 is fixedly installed at the bottom of the rotating sleeve 19. A side limit groove 21 is provided on the sewing machine casing 2, and a limit slider 22 is slidably installed in the side limit groove. One end of the limit slider 22 is fixedly mounted on the arc-shaped positioning block 20. Since the driving gear 5 and the positioning disk 9 are both mounted on the stitch length adjustment knob 4, if the stitch length adjustment knob 4 is rotated manually, the driving gear 5 and the positioning disk 9 can be driven to rotate synchronously.

[0027] The driving gear 5 is engaged with the driving rack 6. When the driving gear 5 is in the engaged state, the stitch length adjustment knob 4 can be rotated by the micro electric telescopic rod 8. On the contrary, when the driving gear 5 is not engaged with the driving rack 6, the user can manually rotate the stitch length adjustment knob 4.

[0028] When the utility model is in use, the user can place the cloth on the working base plate 1, and then the sewing machine needle 3 can be used for sewing. Since the stitch length needs to be changed when sewing different cloths, the user can make the micro electric telescopic rod 8 work and drive the right-angle driving rod 7 to move, thereby driving the driving rack 6 to move, and the driving rack 6 and the driving gear 5 are in a meshing state, thereby driving the driving gear 5, the stitch length adjustment knob 4 and the positioning disk 9 to rotate. After the stitch length adjustment knob 4 is rotated, the stitch length of the sewing machine needle 3 can be adjusted. The operation is convenient. Electrical failure may occur through the electric control method. When a failure occurs, the user can manually pull the operating handle 14 to one side, thereby driving the pull rod 12 and the extrusion fixing block 13 to move to one side. At the same time, when the operating handle 14 is pulled to one side, the extrusion spring 15 is extended. When the extrusion fixing block 13 does not squeeze the L-shaped penetration plate 11, the user can slide the L-shaped penetration plate 11 toward the extrusion fixing position for a distance, and then the user can pull the L-shaped penetration plate 11 upward, and then the micro-electric telescopic rod 8, the right-angle drive rod 7 and the drive rack 6 can be disassembled conveniently and quickly. After the micro-electric telescopic rod 8 is disassembled, the user can manually rotate the stitch adjustment knob 4. After the stitch adjustment knob 4 is rotated, the user uses the anti-slip handle 18 to spirally descend the positioning screw 17, so that one end of the positioning screw 17 can rotate in the rotating sleeve 19, and then the positioning screw 17 can cause the arc positioning block 20 and the limit slider 22 to descend until the arc positioning block 20 is tightly fitted with the outer side of the positioning disk 9, thereby achieving the purpose of positioning the positioning disk 9 and the stitch adjustment knob 4, ensuring that the stitch length will not be accidentally changed during operation.

[0029] The above shows and describes the basic principles and main features of the invention and the advantages of the invention. Those skilled in the art should understand that the invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the invention. Without departing from the spirit and scope of the invention, the invention may have various changes and improvements, which shall fall within the scope of the invention to be protected. The scope of protection of the invention shall be defined by the appended claims and their equivalents.

Claims

1. A sewing machine needle length adjustment device, comprising a working base plate (1), a sewing machine housing (2) and a sewing machine needle (3), wherein the sewing machine housing (2) is fixedly connected to the top of the working base plate (1), the sewing machine needle (3) is fixedly mounted on the sewing machine housing (2), and a needle length adjustment knob (4) for adjusting the stitch length is rotatably mounted on the sewing machine needle (3), characterized in that: A driving gear (5) is fixedly mounted on the stitch length adjustment knob (4), a driving rack (6) is provided on one side of the driving gear (5), a right-angle driving rod (7) is connected to the outer side wall of the driving rack (6), a micro electric telescopic rod (8) is fixedly mounted on the top of one end of the right-angle driving rod (7), a detachable fixing assembly for positioning the micro electric telescopic rod (8) is mounted on the outer side wall of one side of the sewing machine housing (2), a positioning disk (9) is fixedly mounted on the stitch length adjustment knob (4), and a manual limiting assembly for fixing the positioning disk (9) is mounted on the top of the sewing machine housing (2).

2. The sewing machine needle length adjustment device according to claim 1, characterized in that: The easily detachable fixing assembly comprises a side mounting block (10), wherein the side mounting block (10) is fixedly mounted on an outer side wall of one side of the sewing machine housing (2), and a mounting through hole is provided on the side mounting block (10), wherein an L-shaped through plate (11) is passed through the mounting through hole.

3. The sewing machine needle length adjustment device according to claim 2, characterized in that: One end of the micro electric telescopic rod (8) is fixedly mounted on the L-shaped through-plate (11); a through hole is provided on one end of the side mounting block (10); a pull rod (12) is passed through the through hole; an extrusion fixing block (13) is mounted on one end of the pull rod (12); and the extrusion fixing block (13) is provided on one side of the L-shaped through-plate (11).

4. The sewing machine needle length adjustment device according to claim 3, characterized in that: An operating handle (14) is fixedly mounted on one end of the pull rod (12), an extrusion spring (15) is fixedly mounted on the inner side wall of the operating handle (14), and one end of the extrusion spring (15) is fixedly mounted on the outer side wall of the side mounting block (10).

5. The sewing machine needle length adjustment device according to claim 1, characterized in that: The manual limiting assembly comprises a top connecting seat (16), which is mounted on the top of the sewing machine housing (2) via a fixing bolt. A threaded hole is provided on the top connecting seat (16), and a positioning screw (17) is screwed into the threaded hole.

6. The sewing machine needle length adjustment device according to claim 5, characterized in that: The top of the positioning screw (17) is fixedly mounted with an anti-slip handle (18), the bottom of the positioning screw (17) is rotatably mounted with a rotating sleeve (19), and the bottom of the rotating sleeve (19) is fixedly mounted with an arc-shaped positioning block (20).

7. The sewing machine needle length adjustment device according to claim 6, characterized in that: The sewing machine housing (2) is provided with a side limiting groove (21), a limiting slider (22) is slidably installed in the side limiting groove, and one end of the limiting slider (22) is fixedly installed on the arc-shaped positioning block (20).

8. The sewing machine needle length adjustment device according to claim 1, characterized in that: The driving gear (5) is meshed with the driving rack (6).

Images