Adjustable transmission mechanism for sewing machine

Abstract

The utility model relates to the field of sewing machines, and discloses an adjustable transmission mechanism for a sewing machine, which comprises a long connecting rod, a lower feeding component is arranged at the bottom end of the long connecting rod, a connecting component is arranged at the top end of the long connecting rod, a transmission component is arranged at the top end of the connecting component, and a needle bearing is mounted at the front end of the long connecting rod. The lower feeding assembly comprises a first positioning bolt, the first positioning bolt is connected to the inner wall of the needle bearing in an inserted mode, the connecting assembly comprises a connecting plate, the lower feeding assembly further comprises a first connecting sleeve, a first sliding groove is formed in the front end of the first connecting sleeve, and the first positioning bolt slides on the inner wall of the first sliding groove. According to the device, the transmission assembly and the long connecting rod are connected through the connecting assembly, when the synchronism of the device is low, the relative position between the bead set connecting rod and the long connecting rod can be adjusted by adjusting the positions of two sets of second positioning bolts and second positioning nut plates, and the whole device is high in precision.

Description

Technical Field

[0001] The utility model relates to the field of sewing machines, in particular to an adjustable transmission mechanism for sewing machines. Background Art

[0002] A sewing machine is a machine used to sew cloth and make clothes and other textiles. Compared with manual sewing, sewing machines can complete the sewing work quickly, greatly saving time and energy. In garment factories, a large amount of clothing production depends on the efficient operation of sewing machines.

[0003] The existing internal feed connecting rod connection method of the sewing machine is generally fixed with a single-hole screw pin, which will result in the relative position between the needle bar and the lower feed assembly cannot be adjusted. Since the parts cannot be guaranteed to perfectly meet the design dimensions during production and the relative position between the two cannot be adjusted, the synchronization of these parts cannot be guaranteed during use, and relative friction may occur, resulting in increased operating wear of the entire device during use, and the overall device has poor accuracy. Therefore, an adjustable transmission mechanism for a sewing machine is proposed to solve the above problems. Utility Model Content

[0004] In order to remedy the above deficiencies, the utility model provides an adjustable transmission mechanism for a sewing machine, aiming to improve the problem in the prior art that "since the relative position between the needle bar and the lower feed shaft cannot be adjusted, the synchronization between the two cannot be guaranteed during use".

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: an adjustable transmission mechanism for a sewing machine, comprising a long connecting rod, a lower feeding assembly is arranged at the bottom end of the long connecting rod, a connecting assembly is arranged at the top end of the long connecting rod, a transmission assembly is arranged at the top end of the connecting assembly, a needle bearing is installed at the front end of the long connecting rod, the lower feeding assembly comprises a positioning bolt 1, the positioning bolt 1 is inserted into the inner wall of the needle bearing, and the connecting assembly comprises a connecting plate.

[0006] As a further description of the above technical solution:

[0007] The lower feeding assembly also includes a connecting sleeve 1, a slide groove 1 is arranged at the front end of the connecting sleeve 1, the positioning bolt 1 slides on the inner wall of the slide groove 1, and a positioning nut plate 1 is threadedly connected to the front end of the positioning bolt 1.

[0008] As a further description of the above technical solution:

[0009] The rear end of the connecting sleeve 1 is provided with a stepped groove 1, and the stepped groove 1 is matched with a positioning nut plate 1.

[0010] As a further description of the above technical solution:

[0011] The transmission assembly includes a ball-set connecting rod, and the needle bearings are arranged in multiple groups. A needle bearing is installed at the front end of the ball-set connecting rod near the bottom end, and a needle bearing is installed at the front end of the long connecting rod near the top end.

[0012] As a further description of the above technical solution:

[0013] The connecting assembly also includes a second positioning bolt, which is inserted into the inner wall of the needle bearing at the top end of the long connecting rod, and the left end of the second positioning bolt is threadedly connected with a second positioning nut plate.

[0014] As a further description of the above technical solution:

[0015] The left end of the connecting plate is fixedly connected with a connecting block, the front end of the connecting block is provided with a second slide groove, the left end of the second positioning bolt slides on the inner wall of the second slide groove, the left end of the connecting block is provided with a second step groove, and the second step groove is adapted to the second positioning nut plate.

[0016] As a further description of the above technical solution:

[0017] The connecting plate, connecting block, two positioning bolts and two positioning nut plates are provided in multiple groups. Another group of connecting blocks is fixedly connected to the top of the connecting plate, and another group of two positioning bolts penetrates and slides on the left end of another group of connecting blocks.

[0018] As a further description of the above technical solution:

[0019] A connector is installed at the top of the ball group connecting rod, a needle bearing is arranged near the middle position of the right end of the ball group connecting rod, a connecting pin passes through and is inserted into the left end of the needle bearing at the center position of the ball group connecting rod, and a wheel sleeve is installed on the outer wall of the connecting pin.

[0020] The utility model has the following beneficial effects:

[0021] 1. In the utility model, the transmission assembly and the long connecting rod are connected by using a connecting assembly. When the synchronization of the device is low, the relative position between the bead group connecting rod and the long connecting rod can be adjusted by adjusting the positions of the two sets of positioning bolts 2 and the positioning nut plates 2, and the overall device has high accuracy.

[0022] 2. In the utility model, by setting step groove 1 and step groove 2, when positioning nut plate 1 and positioning nut plate 2 are used to achieve fixation, the step groove will squeeze multiple places of the rear end of the nut plate at the same time, thereby increasing the contact area between the two, increasing the friction coefficient, and improving the fixing stability of the overall device. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a three-dimensional structural schematic diagram of the overall device in the utility model;

[0024] Figure 2 It is a schematic diagram of the three-dimensional structure disassembly of the lower feeding assembly in the utility model;

[0025] Figure 3 It is a schematic diagram of the three-dimensional structure of the connection component in the utility model;

[0026] Figure 4 It is a schematic diagram of the three-dimensional structure disassembly of the transmission component in the utility model.

[0027] Legend:

[0028] 1. Long connecting rod; 2. Lower feeding assembly; 21. Step groove one; 22. Slide groove one; 23. Connecting sleeve one; 24. Positioning bolt one; 25. Positioning nut plate one; 3. Connecting assembly; 31. Connecting plate; 32. Connecting block; 33. Step groove two; 34. Slide groove two; 35. Positioning bolt two; 36. Positioning nut plate two; 4. Transmission assembly; 41. Ball group connecting rod; 42. Connecting pin; 43. Wheel sleeve; 44. Connecting head; 5. Needle roller bearing. DETAILED DESCRIPTION

[0029] 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.

[0030] Reference Figure 1 - Figure 3 The utility model provides an embodiment: an adjustable transmission mechanism for a sewing machine, comprising a long connecting rod 1 for transmitting motion, a lower feeding assembly 2 for connecting with a lower feeding rod is arranged at the bottom end of the long connecting rod 1, a connecting assembly 3 for connecting the long connecting rod 1 and a transmission assembly 4 is arranged at the top end of the long connecting rod 1, a transmission assembly 4 for connecting a power assembly is arranged at the top end of the connecting assembly 3, a needle bearing 5 for supporting the rotation of other components is installed at the front end of the long connecting rod 1, the lower feeding assembly 2 comprises a positioning bolt 24 for pulling a positioning nut plate 25, the positioning bolt 24 is inserted into the inner wall of the needle bearing 5, after the positioning bolt 24 is inserted into the inside of the needle bearing 5, relative rotation cannot occur between the two, and the connecting assembly 3 comprises a connecting plate 31 for connecting the overall connecting assembly 3.

[0031] Reference Figure 1 - Figure 3The lower feeding assembly 2 also includes a connecting sleeve 23 for supporting the connecting sleeve 23. The front end of the connecting sleeve 23 is provided with a slide groove 22 for sliding the positioning bolt 24. The positioning bolt 24 slides on the inner wall of the slide groove 22. The relative position between the connecting sleeve 23 and the long connecting rod 1 can be adjusted by adjusting the position of the positioning bolt 24 inside the slide groove 22. The front end of the positioning bolt 24 is threadedly connected with a positioning nut plate 25 for fixing the positioning bolt 24. The rear end of the connecting sleeve 23 is provided with a stepped groove 21 for supporting the positioning nut plate 25. The stepped groove 21 and the positioning nut plate 25 Correspondingly, when the positioning nut plate 25 contacts the stepped groove 21, the stepped groove 21 will be completely fitted with the rear end of the positioning nut plate 25 at the same time, so that the contact area between the two can be increased, thereby achieving the effect of increasing friction. The transmission component 4 includes a ball group connecting rod 41 for transmitting motion, and there are multiple groups of needle bearings 5. The front end of the ball group connecting rod 41 is installed with a needle bearing 5 near the bottom end, and the front end of the long connecting rod 1 is installed with a needle bearing 5 near the top end. The needle bearing 5 is a prior art and can be used after installation. Due to the prior art and the fact that it can be implemented by people in this field, no further description will be given in this case.

[0032] Reference Figure 1 - Figure 3The connecting assembly 3 also includes a positioning bolt 235 for pulling the positioning nut plate 236. The positioning bolt 235 is inserted into the inner wall of the needle bearing 5 at the top end of the long connecting rod 1. After the positioning bolt 235 is inserted into the inside of the needle bearing 5, the two cannot rotate relative to each other. The left end of the positioning bolt 235 is threadedly connected with a positioning nut plate 236 for squeezing the connecting block 32. The left end of the connecting plate 31 is fixedly connected with a connecting block 32 for fixing the top end of the long connecting rod 1. The front end of the connecting block 32 is provided with a slide groove 234 for sliding the positioning bolt 235. The left end of the positioning bolt 235 slides on the inner wall of the slide groove 234. By adjusting the position of the positioning bolt 235 inside the slide groove 234, the relative position between the top end of the long connecting rod 1 and the connecting plate 31 can be adjusted. The left end of the connecting block 32 is provided with a stepped groove 233 for directly contacting the positioning nut plate 236. The stepped groove 233 and the positioning nut plate 236 are relative to each other. Adaptation, the stepped groove 33 can also be completely fitted with the front end of the positioning nut plate 36. There are multiple groups of connecting plates 31, connecting blocks 32, positioning bolts 35, and positioning nut plates 36. Another group of connecting blocks 32 is fixedly connected to the top of the connecting plate 31, and another group of connecting blocks 32 can be used to fix the transmission assembly 4. Another group of positioning bolts 35 penetrates and slides on the left end of another group of connecting blocks 32. The top of the bead group connecting rod 41 is equipped with a connecting head 44 for connecting the inverted seam frame in the machine tool. The right end of the bead group connecting rod 41 is provided with a needle bearing 5 near the middle position for supporting the rotation of the connecting pin 42. The left end of the needle bearing 5 at the center position of the bead group connecting rod 41 penetrates and is plugged with a connecting pin 42 for supporting the wheel sleeve 43. The outer wall of the connecting pin 42 is equipped with a wheel sleeve 43 for installing an eccentric wheel. The wheel sleeve 43 and the front end of the connecting pin 42 are both provided with matching threaded holes, and the two can be fixedly connected with bolts.

[0033] Working principle: When the sewing machine is in use, if there is a deviation in the stroke between the transmission component 4 and the lower feeding component 2, the connection between the bead group connecting rod 41, the connecting block 32 and the long connecting rod 1 can be released by screwing the positioning bolt 2 35, and then the relative positions of the three can be adjusted by adjusting the position of the positioning bolt 2 35 in the slide groove 2 34, and then the positioning bolt 2 35 can be retightened to fix the relative position of the transmission component 4 and the top end of the long connecting rod 1.

[0034] When the relative position between the transmission assembly 4 and the long connecting rod 1 is adjusted, the positioning bolt 24 can be screwed to loosen the connection between the positioning nut plate 25 and the connecting sleeve 23, and then the connecting sleeve 23 can be moved left and right to change the relative position of the connecting sleeve 23 and the bottom end of the long connecting rod 1. When the position between the connecting sleeve 23 and the long connecting rod 1 is adjusted, the positioning bolt 24 can be re-tightened to re-fix the connecting sleeve 23, so that the stroke deviation inside the device can be corrected.

[0035] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An adjustable transmission mechanism for a sewing machine, comprising a long connecting rod (1), characterized in that: The bottom end of the long connecting rod (1) is provided with a lower feeding assembly (2), the top end of the long connecting rod (1) is provided with a connecting assembly (3), the top end of the connecting assembly (3) is provided with a transmission assembly (4), the front end of the long connecting rod (1) is installed with a needle bearing (5), the lower feeding assembly (2) includes a positioning bolt (24), the positioning bolt (24) is inserted into the inner wall of the needle bearing (5), and the connecting assembly (3) includes a connecting plate (31).

2. The adjustable transmission mechanism for a sewing machine according to claim 1, characterized in that: The lower feeding assembly (2) further comprises a connecting sleeve (23), a front end of which is provided with a slide groove (22), a positioning bolt (24) sliding on the inner wall of the slide groove (22), and a front end of the positioning bolt (24) being threadedly connected with a positioning nut plate (25).

3. The adjustable transmission mechanism for a sewing machine according to claim 2, characterized in that: The rear end of the connecting sleeve 1 (23) is provided with a stepped groove 1 (21), and the stepped groove 1 (21) is matched with a positioning nut plate 1 (25).

4. The adjustable transmission mechanism for a sewing machine according to claim 1, characterized in that: The transmission assembly (4) comprises a ball-set connecting rod (41), and the needle bearings (5) are arranged in multiple groups. The front end of the ball-set connecting rod (41) is equipped with a needle bearing (5) near the bottom end, and the front end of the long connecting rod (1) is equipped with a needle bearing (5) near the top end.

5. The adjustable transmission mechanism for a sewing machine according to claim 4, characterized in that: The connecting assembly (3) also includes a second positioning bolt (35), which is inserted into the inner wall of the needle bearing (5) at the top end of the long connecting rod (1), and the left end of the second positioning bolt (35) is threadedly connected to a second positioning nut plate (36).

6. The adjustable transmission mechanism for a sewing machine according to claim 5, characterized in that: The left end of the connecting plate (31) is fixedly connected to a connecting block (32), a front end of the connecting block (32) is provided with a second slide groove (34), the left end of the second positioning bolt (35) slides on the inner wall of the second slide groove (34), and the left end of the connecting block (32) is provided with a second step groove (33), and the second step groove (33) and the second positioning nut plate (36) are adapted to each other.

7. The adjustable transmission mechanism for a sewing machine according to claim 6, characterized in that: The connecting plate (31), the connecting block (32), the second positioning bolt (35), and the second positioning nut plate (36) are provided in multiple groups, and another group of the connecting blocks (32) are fixedly connected to the top end of the connecting plate (31), and another group of the second positioning bolts (35) penetrate and slide on the left end of another group of the connecting blocks (32).

8. The adjustable transmission mechanism for a sewing machine according to claim 4, characterized in that: A connector (44) is installed at the top end of the ball group connecting rod (41), a needle bearing (5) is arranged near the middle position at the right end of the ball group connecting rod (41), a connecting pin (42) penetrates and is inserted into the left end of the needle bearing (5) at the center position of the ball group connecting rod (41), and a wheel sleeve (43) is installed on the outer wall of the connecting pin (42).

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