Stitch length adjusting device for an overlock machine and overlock machine

Abstract

The utility model provides a kind of stitcher's stitch length adjusting device and stitcher, belong to sewing equipment technical field.Stitcher includes casing, eccentric cam is provided in casing and big connecting rod, eccentric cam is provided on main shaft, the lower part of big connecting rod is set on eccentric cam, the top of big connecting rod one side is connected with transmission shaft one, stitch length adjusting device includes shaft and chuck, shaft is connected in the other side of the top of big connecting rod, chuck is fixed in the lower part of one side of big connecting rod, chuck is set on main shaft, chuck and main shaft are provided with the connecting assembly of making big connecting rod and main shaft linkage, connecting rod one, connecting rod two and reset piece are provided on shaft, button is provided on the outside of casing, when button and connecting rod two abut, connecting rod one can be contacted with connecting assembly and make big connecting rod and main shaft disengage linkage.This stitch length adjusting device can manually adjust stitch length by pressing the button on the outside of casing and manually rotating main shaft, it is easy to operate, and work efficiency is high.

Description

Technical Field

[0001] This utility model belongs to the field of sewing equipment technology, and relates to a stitch length adjustment device for an overlock sewing machine and an overlock sewing machine. Background Technology

[0002] During operation, the stitch length of the overlock sewing machine needs to be adjusted for different fabrics or process requirements. In the prior art, stitch length adjustment is generally achieved through a drive mechanism, such as the differential linkage mechanism for stitch length in a sewing machine disclosed in application number 202221047352.9. This mechanism includes a differential adjustment mechanism, a stitch length adjustment mechanism, and a feed crank. The stitch length adjustment mechanism is connected to the feed crank and drives it to swing. The differential adjustment mechanism includes a differential shaft, and the stitch length adjustment mechanism includes a stitch length adjustment crank. The mechanism also includes a drive mechanism, which comprises a motor, a drive rod, a connecting rod, and an adjusting rod. The output shaft of the motor is fixedly connected to one end of the drive rod, and the other end of the drive rod is connected to the connecting rod and drives it to swing. The adjusting rod is mounted on the differential shaft and drives it to rotate. The other end of the connecting rod is connected to the adjusting rod and drives it to swing. After the other end of the adjusting rod swings to a set angle, it is locked to the stitch length adjustment crank.

[0003] The drawback of using a drive mechanism for stitch pitch adjustment is that its structure is relatively complex and its manufacturing cost is high. How to make it convenient to manually adjust the stitch pitch is a direction that those skilled in the art are striving to achieve. Utility Model Content

[0004] This utility model addresses the aforementioned problems in the prior art by providing a stitch length adjustment device for an overlock sewing machine. The technical problem to be solved by this utility model is: how to conveniently adjust the stitch length manually.

[0005] The objective of this utility model can be achieved through the following technical solutions: A stitch length adjustment device for an overlock sewing machine, the overlock sewing machine including a machine housing, a main shaft and a connecting rod disposed within the machine housing, an eccentric cam disposed on the main shaft, the lower part of the connecting rod being sleeved on the eccentric cam, and a drive shaft connected to one side of the top of the connecting rod, characterized in that the stitch length adjustment device includes a rotating shaft and a chuck, the rotating shaft being connected to the other side of the top of the connecting rod, the chuck being fixed to one side of the lower part of the connecting rod and sleeved on the main shaft, a connecting assembly for linking the connecting rod with the main shaft being disposed on the rotating shaft, a connecting rod one, a connecting rod two and a reset member being disposed on the rotating shaft, and a button being disposed on the outside of the machine housing, wherein when the button abuts against the connecting rod two, the connecting rod one can contact the connecting assembly and disengage the connecting rod from the main shaft.

[0006] Its working principle is as follows: Drive shaft one is connected to the differential gear carriage. During normal operation, the connecting assembly links the main connecting rod with the spindle. The drive source drives the spindle to rotate, and the spindle drives drive shaft one through the main connecting rod. Drive shaft one drives the differential gear carriage to swing. When adjusting the stitch length, the drive source is not working. Manually rotate the spindle and press the button. The button pushes the connecting rod two, which drives the rotating shaft to rotate. When connecting rod one contacts the connecting assembly, connecting rod one disengages the main connecting rod from the spindle. Continue rotating the spindle. The spindle rotates relative to the main connecting rod, thereby adjusting the relative position of the spindle's axis and the center of the circular hole at the bottom of the main connecting rod (the spindle and the circular hole at the bottom of the main connecting rod are connected by an eccentric cam, and the two are eccentric), thus completing the stitch length adjustment (the relative position of the spindle's axis and the center of the circular hole at the bottom of the main connecting rod determines the swing amplitude of the gear carriage, and the swing amplitude of the gear carriage determines the stitch length). After completing the stitch length adjustment, release the button, and the reset component resets the rotating shaft, and the main connecting rod and the spindle are back in a linked state.

[0007] In this needle spacing adjustment device, the button is located on the outside of the machine housing. By pressing the button on the outside of the machine housing and manually rotating the main shaft, the needle spacing can be easily adjusted manually.

[0008] In the stitch length adjustment device of the overlock sewing machine described above, the connecting assembly includes a gear and a slider. The gear is sleeved on the main shaft, and the slider is movably connected to the chuck. The bottom of the slider has a boss with teeth that can mesh with or separate from the gear. The edge of the chuck has a groove, and the outer end of the connecting rod has a hook that can extend into the groove and abut against the slider.

[0009] During normal operation, the teeth on the boss mesh with the gears, and the main shaft drives the connecting rod to move. The two are in a linked state. When adjusting the stitch length, manually rotate the main shaft and press the button. The button pushes the second connecting rod, which drives the shaft to rotate. The chuck rotates with the main shaft. When the hook on the first connecting rod engages with the slot on the chuck, the hook pushes the slider downward, causing the teeth on the boss to disengage from the gears. The connecting rod is then disengaged from the main shaft. Continue rotating the main shaft, and the main shaft rotates relative to the connecting rod, thereby adjusting the relative position of the main shaft's axis and the center of the circular hole at the bottom of the connecting rod, thus completing the stitch length adjustment.

[0010] In the stitch length adjustment device of the overlock sewing machine described above, the chuck is provided with a groove, the slider is slidably connected in the groove, and the side wall of the slider is respectively abutting against the corresponding groove wall of the groove.

[0011] The slider is slidably connected to the chuck via a slide groove. The slide groove is used to accommodate the slider and guide it, which greatly improves the stability of the slider during movement.

[0012] In the stitch length adjustment device of the overlock sewing machine described above, the reset component includes a torsion spring, which is sleeved on the rotating shaft, and one end and the other end of the torsion spring are respectively fixed on the rotating shaft and the machine housing.

[0013] When the button drives the shaft to rotate, the torsion spring is in a twisted state. When the button is released, the shaft returns to its original position under the elastic force of the torsion spring.

[0014] In the stitch length adjustment device of the overlock sewing machine described above, a connector is provided at the top of the main connecting rod. One side and the other side of the connector have an extension rod one and an extension rod two, respectively. The extension rod one is connected to the rotating shaft, and a crank is installed on the extension rod two. The crank is connected to the transmission shaft one.

[0015] This utility model also provides an overlock sewing machine, which includes any of the above-mentioned stitch length adjustment devices.

[0016] Compared with the prior art, the advantages of this utility model are as follows: In this needle spacing adjustment device, the button is located on the outside of the machine housing. By pressing the button on the outside of the machine housing and manually rotating the main shaft, the needle spacing can be manually adjusted, which is convenient to operate and has high work efficiency. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the needle spacing adjustment device; Figure 2 yes Figure 1 Enlarged view of part A in the image; Figure 3 This is a schematic diagram of the connecting rod being mounted on the main shaft; Figure 4 This is a schematic diagram of the slider being mounted on the chuck.

[0018] In the diagram: 1. Main shaft, 2. Connecting rod, 3. Eccentric cam, 4. Drive shaft one, 5. Rotary shaft, 6. Chuck, 7. Connecting assembly, 8. Connecting rod one, 9. Connecting rod two, 10. Reset piece, 11. Button, 12. Gear, 13. Slider, 14. Boss, 15. Slot, 16. Hook, 17. Slide, 18. Extension rod one, 19. Extension rod two, 20. Crank, 21. Connecting piece. Detailed Implementation

[0019] The following are specific embodiments of the present invention, and the technical solution of the present invention will be further described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0020] like Figure 1-3As shown, the overlock sewing machine includes a machine housing (not shown), in which a main shaft 1 and a connecting rod 2 are disposed. An eccentric cam 3 is disposed on the main shaft 1. The lower part of the connecting rod 2 is sleeved on the eccentric cam 3. A drive shaft 4 is connected to one side of the top of the connecting rod 2. The stitch length adjustment device includes a rotating shaft 5 and a chuck 6. The rotating shaft 5 is connected to the other side of the top of the connecting rod 2. The chuck 6 is fixed to one side of the lower part of the connecting rod 2 and is sleeved on the main shaft 1. A connecting assembly 7 is disposed on the chuck 6 and the main shaft 1 to link the connecting rod 2 with the main shaft 1. A connecting rod 8, a connecting rod 9, and a reset member 10 are disposed on the rotating shaft 5. A button 11 is disposed on the outside of the machine housing. When the button 11 abuts against the connecting rod 9, the connecting rod 8 can contact the connecting assembly 7 and disengage the connecting rod 2 from the main shaft 1.

[0021] Drive shaft 4 is connected to the differential gear carriage. During normal operation, connecting assembly 7 links the main connecting rod 2 with the main shaft 1. The drive source drives the main shaft 1 to rotate. The main shaft 1 drives drive shaft 4 through the main connecting rod 2. Drive shaft 4 drives the differential gear carriage to swing. When adjusting the stitch length, the drive source does not work. Manually rotate the main shaft 1 and press button 11. Button 11 pushes connecting rod 9. Connecting rod 9 drives the rotating shaft 5 to rotate. When connecting rod 8 contacts connecting assembly 7, connecting rod 8 disengages the main connecting rod 2 from the main shaft 1. Continue rotating the main shaft 1. The main shaft 1 rotates relative to the main connecting rod 2, thereby adjusting the relative position of the axis of the main shaft 1 and the center of the circular hole at the bottom of the main connecting rod 2 (the main shaft 1 and the circular hole at the bottom of the main connecting rod 2 are connected by an eccentric cam 3, and the two are eccentric), thus completing the stitch length adjustment (the relative position of the axis of the main shaft 1 and the center of the circular hole at the bottom of the main connecting rod 2 determines the swing amplitude of the gear carriage, and the swing amplitude of the gear carriage determines the stitch length). After completing the stitch length adjustment, release button 11, reset component 10 resets the rotating shaft 5, and the connecting rod 2 and the main shaft 1 are in a linked state again.

[0022] like Figure 2 and 4 As shown, in this embodiment, the connecting component 7 includes a gear 12 and a slider 13. The gear 12 is sleeved on the main shaft 1, and the slider 13 is movably connected to the chuck 6. The bottom of the slider 13 has a boss 14 with teeth that can mesh with or separate from the gear 12. The edge of the chuck 6 is provided with a groove 15, and the outer end of the connecting rod 8 has a hook 16 that can extend into the groove 15 and abut against the slider 13.

[0023] During normal operation, the teeth on the boss 14 mesh with the gear 12, and the main shaft 1 can drive the connecting rod 2 to move. The two are in a linked state. When adjusting the stitch length, manually rotate the main shaft 1 and press the button 11. The button 11 pushes the connecting rod 9, which drives the rotating shaft 5 to rotate. The chuck 6 rotates with the main shaft 1. When the hook 16 on the connecting rod 8 is engaged in the slot 15 on the chuck 6, the hook 16 pushes the slider 13 to move downward, causing the teeth on the boss 14 to disengage from the gear 12. The connecting rod 2 is disengaged from the main shaft 1. Continue to rotate the main shaft 1. The main shaft 1 rotates relative to the connecting rod 2, thereby adjusting the relative position of the axis of the main shaft 1 and the center of the circular hole at the bottom of the connecting rod 2, thus completing the stitch length adjustment.

[0024] like Figure 4 As shown, in this embodiment, the chuck 6 is provided with a sliding groove 17, and the slider 13 is slidably connected in the sliding groove 17, with the side wall of the slider 13 abutting against the corresponding groove wall of the sliding groove 17.

[0025] The slider 13 is slidably connected to the chuck 6 via the slide groove 17. The slide groove 17 is used to accommodate the slider 13 and guides the slider 13, which greatly improves the stability of the slider 13 when it moves. The slide groove 17 is provided with a reset member. After the needle pitch is adjusted, the reset member resets the slider 13 so that the teeth on the boss 14 re-mesh with the gear 12.

[0026] As one embodiment, the reset member 10 includes a torsion spring, which is sleeved on the rotating shaft 5, with one end of the torsion spring fixed to the rotating shaft 5 and the housing, respectively.

[0027] When button 11 drives the rotating shaft 5 to rotate, the torsion spring is in a twisted state. When button 11 is released, the rotating shaft 5 returns to its original position under the elastic force of the torsion spring.

[0028] like Figure 1 and 3 As shown, in this embodiment, a connector 21 is provided on the top of the connecting rod 2. One side and the other side of the connector 21 have an extension rod 18 and an extension rod 29, respectively. The extension rod 18 is connected to the rotating shaft 5, and a crank 20 is installed on the extension rod 29. The crank 20 is connected to the transmission shaft 4.

[0029] This utility model also provides an overlock sewing machine, which includes any of the above-described stitch length adjustment devices. The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A stitch length adjustment device for an overlock sewing machine, the overlock sewing machine comprising a machine housing, wherein a main shaft (1) and a connecting rod (2) are disposed in the machine housing, an eccentric cam (3) is disposed on the main shaft (1), the lower part of the connecting rod (2) is sleeved on the eccentric cam (3), and a transmission shaft (4) is connected to one side of the top of the connecting rod (2), characterized in that, The needle spacing adjustment device includes a rotating shaft (5) and a chuck (6). The rotating shaft (5) is connected to the other side of the top of the connecting rod (2). The chuck (6) is fixed to one side of the lower part of the connecting rod (2). The chuck (6) is sleeved on the main shaft (1). The chuck (6) and the main shaft (1) are provided with a connecting component (7) that enables the connecting rod (2) to be linked with the main shaft (1). The rotating shaft (5) is provided with a connecting rod one (8), a connecting rod two (9) and a reset component (10). A button (11) is provided on the outside of the housing. When the button (11) abuts against the connecting rod two (9), the connecting rod one (8) can contact the connecting component (7) and disengage the connecting rod (2) from the main shaft (1).

2. The stitch length adjustment device for the overlock sewing machine according to claim 1, characterized in that, The connecting assembly (7) includes a gear (12) and a slider (13). The gear (12) is sleeved on the main shaft (1). The slider (13) is movably connected to the chuck (6). The bottom of the slider (13) has a boss (14) with teeth that can mesh with or separate from the gear (12). The edge of the chuck (6) has a groove (15). The outer end of the connecting rod (8) has a hook (16) that can extend into the groove (15) and abut against the slider (13).

3. The stitch length adjustment device for the overlock sewing machine according to claim 2, characterized in that, The chuck (6) has a groove (17) and the slider (13) is slidably connected in the groove (17) with the side wall of the slider (13) abutting against the corresponding groove wall of the groove (17).

4. The stitch length adjustment device for an overlock sewing machine according to claim 1, 2, or 3, characterized in that, The reset component (10) includes a torsion spring, which is sleeved on the rotating shaft (5), with one end of the torsion spring fixed to the rotating shaft (5) and the other end fixed to the housing, respectively.

5. The stitch length adjustment device for an overlock sewing machine according to claim 1, 2, or 3, characterized in that, The top of the connecting rod (2) is provided with a connector (21). One side and the other side of the connector (21) are respectively provided with an extension rod one (18) and an extension rod two (19). The extension rod one (18) is connected to the rotating shaft (5). A crank (20) is installed on the extension rod two (19). The crank (20) is connected to the transmission shaft one (4).

6. An overlock sewing machine, characterized in that, The overlock sewing machine includes the stitch length adjustment device as described in any one of claims 1-5.

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