Stitch length adjusting equipment for overlock sewing machine

Abstract

The utility model discloses stitch length adjusting equipment for an overlock machine, which comprises a shell and a hand wheel arranged on one side of the shell, the output end of the hand wheel is connected with a first main shaft, a reduction gearbox is further arranged on the inner wall of the shell, a second main shaft is arranged on one side of the reduction gearbox, and the second main shaft is connected with a second main shaft. The precision control mechanism comprises a fluted disc arranged in the reduction gearbox, a sun gear is arranged at one end, extending into the reduction gearbox, of the first main shaft, and three planetary gears distributed at equal intervals are arranged between the sun gear and the fluted disc. The stitch length adjusting equipment for the overlock sewing machine has the technical effects that the adjusting precision is improved, and the adjustment is quicker and more convenient.

Description

Technical Field

[0001] This utility model relates to the field of overlock machine technology, and in particular to a stitch length adjustment device for overlock machines. Background Technology

[0002] Overlock machines (also known as overlock sewing machines or overlock edge machines) are specialized equipment used in garment manufacturing for edge finishing. They are primarily used to prevent fabric edges from fraying, improving the durability and appearance of the finished product. Overlock machines are indispensable in garment production, and their selection requires comprehensive consideration of fabric type, process requirements, and budget. Three-thread, four-thread, and five-thread overlock machines each have their applicable scenarios, while multi-functional and automatic models can meet more complex process requirements.

[0003] However, traditional stitch length adjustment devices used in overlock machines have overly simple adjustment structures, making it difficult to guarantee the accuracy of adjustment during the twisting process. They cannot make quick and effective adjustments when faced with scenarios requiring fine stitch length.

[0004] For example, traditionally, when adjusting the stitch length, one would press and hold the stitch length adjustment button and then turn the handwheel, relying on the approximate range of hand rotation to control the stitch length adjustment. However, during this process, it is difficult to control the number of turns of the handwheel, which can easily lead to poor adjustment accuracy. Utility Model Content

[0005] This utility model discloses a stitch length adjustment device for overlock machines, aiming to solve the technical problem that traditional stitch length adjustment devices for overlock machines have an overly simple adjustment structure, making it difficult to guarantee the accuracy of adjustment during the twisting process, and are unable to quickly and effectively adjust when faced with some scenarios requiring fine stitch length.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A stitch pitch adjustment device for a lockstitch machine includes a housing and a handwheel mounted on one side of the housing. The output end of the handwheel is connected to a first main shaft. A reduction gearbox is also installed on the inner wall of the housing. A second main shaft is provided on one side of the reduction gearbox. The device further includes: a precision control mechanism: the precision control mechanism includes a geared disc disposed within the reduction gearbox. A sun gear is provided at one end of the first main shaft extending into the reduction gearbox. Three planetary gears are provided between the sun gear and the geared disc, and the three planetary gears mesh with the sun gear and the geared disc respectively. A planetary carrier is movably connected to one side of the outer wall of the three planetary gears. One end of the planetary carrier is fixed to one end of the second main shaft. An internal probe is provided on the top outer wall of the housing; and an adjustment mechanism: the adjustment mechanism is connected to one end of the second main shaft.

[0008] In this solution, a precision control mechanism can split the traditional spindle into two. A reduction gearbox connects the first and second spindles. By utilizing the transmission conversion between the sun gear and planetary gears in the reduction gearbox, the number of rotations of the second spindle after the handwheel is turned is reduced, thereby controlling the precision of manual adjustment to a certain extent. In addition, the built-in probe installed on the housing monitors the stitch length adjustment process, making the adjustment structure of the overlock machine in this solution more suitable for high-precision adjustment environments, and the adjustment process is faster and more convenient.

[0009] In a preferred embodiment, the adjusting mechanism includes a guide seat disposed at one end of the second main shaft. A connecting sleeve is provided on one side of the guide seat. A feeding rod is provided on the outer wall of one side of the connecting sleeve. A feeding shaft is provided at one end of the feeding rod. The built-in probe is located above the feeding rod. An eccentric sleeve is connected to the inner wall of the connecting sleeve via a bearing. A stitch spacing connection portion is provided on the inner wall of the eccentric sleeve. Guide wedges are provided on both outer walls of the eccentric sleeve. A stitch spacing eccentric wheel is provided on one outer wall of the connecting sleeve. A first guide wheel is provided on the opposite outer wall of the guide seat. The housing includes a guide groove and a second guide groove. One end of each of the two guide wedges is adapted to the interior of the first guide groove and the second guide groove, respectively. A sliding groove is provided on one side of the needle spacing eccentric wheel. A slider is provided on the inner wall of the sliding groove. A locking block is provided on the outer wall of one side of the slider. A toothed groove is provided on the inner side wall of the locking block. A ratchet is provided on the outer wall of one side of the needle spacing eccentric wheel. A limiting gear is provided on the side of the ratchet near the needle spacing eccentric wheel. The limiting gear is adapted to the toothed groove on the locking block. A needle spacing lifting torsion shaft is provided on one side of the housing. A return spring is provided on the outer wall of the needle spacing lifting torsion shaft.

[0010] With the adjustable mechanism, when adjusting the stitch length, you can press the end of the stitch length adjustment shaft by hand and turn the handwheel. This will cause the first and second main shafts to drive the guide seat, eccentric sleeve, and stitch length eccentric wheel to rotate synchronously until one end of the stitch length adjustment shaft is stuck in the notch on one side of the stitch length eccentric wheel. Then, turn the handwheel forward or backward, and the stitch length eccentric wheel will remain stationary under the restriction of the stitch length adjustment shaft. The first and second main shafts will only drive the guide seat and eccentric sleeve to rotate synchronously, so that the stitch length eccentric wheel rotates relative to the first and second main shafts. Adjusting the eccentricity of the feed rod with respect to the first and second main shafts will adjust the stitch length. The whole process is simple and convenient.

[0011] As described above, a stitch length adjustment device for an overlock machine includes a housing and a handwheel mounted on one side of the housing. The output end of the handwheel is connected to a first main shaft. A reduction gearbox is also installed on the inner wall of the housing. A second main shaft is provided on one side of the reduction gearbox. The device further includes: a precision control mechanism comprising a geared disc disposed within the reduction gearbox; a sun gear at one end of the first main shaft extending into the reduction gearbox; three planetary gears equally spaced between the sun gear and the geared disc, each meshing with both the sun gear and the geared disc; a planetary carrier movably connected to one side of the outer wall of each of the three planetary gears; one end of the planetary carrier being fixed to one end of the second main shaft; and a built-in probe on the top outer wall of the housing; and an adjustment mechanism connected to one end of the second main shaft. The stitch length adjustment device for an overlock machine provided by this invention has the technical effects of improving adjustment accuracy and making adjustment faster and more convenient. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of a stitch length adjustment device for an overlock machine proposed in this utility model.

[0013] Figure 2 This is a structural diagram of the internal structure of the gearbox of a stitch pitch adjustment device for an overlock machine, as proposed in this utility model.

[0014] Figure 3 This is a schematic diagram of the adjustment mechanism of a stitch length adjustment device for an overlock machine proposed in this utility model.

[0015] In the attached diagram: 1. Housing; 2. Handwheel; 3. First main shaft; 4. Gearbox; 5. Second main shaft; 6. Built-in probe; 7. Fabric feed shaft; 8. Needle spacing lifting torsion shaft; 10. Guide seat; 11. Gear plate; 12. Sun gear; 13. Planetary gear; 14. Planetary carrier; 15. Connecting sleeve; 16. Fabric feed linkage; 17. Eccentric sleeve; 18. Needle spacing eccentric wheel; 19. Slider; 20. Ratchet; 21. Return spring. Detailed Implementation

[0016] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and marked in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0017] The needle length adjustment device for overlock machines disclosed in this utility model is mainly used in traditional overlock machine needle length adjustment devices. However, the adjustment structure is too simple, and the adjustment accuracy during the twisting process is difficult to guarantee. In some scenarios with fine needle length requirements, it is not possible to adjust quickly and effectively.

[0018] Reference Figure 1 , Figure 2 and Figure 3 A stitch pitch adjustment device for a lockstitch machine includes a housing 1 and a handwheel 2 mounted on one side of the housing 1. The output end of the handwheel 2 is connected to a first main shaft 3. A reduction gearbox 4 is also mounted on the inner wall of the housing 1. A second main shaft 5 is provided on one side of the reduction gearbox 4. The device also includes: a precision control mechanism: the precision control mechanism includes a gear plate 11 disposed in the reduction gearbox 4. A sun gear 12 is provided at one end of the first main shaft 3 that extends into the reduction gearbox 4. Three planetary gears 13 are provided between the sun gear 12 and the gear plate 11, and the three planetary gears 13 mesh with the sun gear 12 and the gear plate 11 respectively. A planet carrier 14 is movably connected to the outer wall of one side of the three planetary gears 13. One end of the planet carrier 14 is fixed to one end of the second main shaft 5. An internal probe 6 is provided on the top outer wall of the housing 1; and an adjustment mechanism: the adjustment mechanism is connected to one end of the second main shaft 5.

[0019] Specifically, the precision control mechanism can split the traditional spindle into two parts. At the same time, the gearbox 4 connects the split spindle 3 and the second spindle 5. By using the transmission conversion between the sun gear 12 and the planetary gear 13 in the gearbox 4, the number of rotations of the second spindle 5 after the handwheel 2 is turned is reduced, thereby controlling the precision of manual adjustment to a certain extent. In addition, the built-in probe 6 installed on the housing 1 monitors the stitch length adjustment process, making the adjustment structure of the overlock machine in this solution more suitable for high-precision adjustment environments.

[0020] Reference Figure 1 and Figure 3In a preferred embodiment, the adjusting mechanism includes a guide seat 10 disposed at one end of the second main shaft 5. A connecting sleeve 15 is provided on one side of the guide seat 10. A feeding rod 16 is provided on the outer wall of one side of the connecting sleeve 15. A feeding shaft 7 is provided at one end of the feeding rod 16. An internal probe 6 is located above the feeding rod 16. An eccentric sleeve 17 is connected to the inner wall of the connecting sleeve 15 via a bearing. An opening stitch distance connecting part is provided on the inner wall of the eccentric sleeve 17. Guide wedges are provided on both outer walls of the eccentric sleeve 17. An opening stitch distance eccentric wheel 18 is provided on the outer wall of one side of the connecting sleeve 15. The outer walls of the needle spacing eccentric wheel 18 and the guide seat 10 on opposite sides are respectively provided with a first guide groove and a second guide groove. One end of the two guide wedge rods is adapted to the interior of the first guide groove and the second guide groove respectively. A sliding groove is provided on one side of the needle spacing eccentric wheel 18. A slider 19 is provided on the inner wall of the sliding groove. A snap-fit ​​block is provided on one side of the outer wall of the slider 19. A toothed groove is provided on the inner side wall of the snap-fit ​​block. A ratchet 20 is provided on one side of the outer wall of the needle spacing eccentric wheel 18. A limiting gear is provided on the side of the ratchet 20 near the needle spacing eccentric wheel 18. The limiting gear is adapted to the toothed groove on the snap-fit ​​block.

[0021] A torsion spring connects the eccentric wheel 18 and the slider 19, and the slider 19 can be reset using the torsion spring.

[0022] Reference Figure 3 In a preferred embodiment, a needle spacing lifting shaft 8 is provided on one side of the housing 1, and a return spring 21 is provided on the outer wall of the needle spacing lifting shaft 8.

[0023] Specifically, the needle spacing adjustment mechanism is driven by the needle spacing lifting shaft 8 and the handwheel 2.

[0024] Working principle: When using the overlock machine, first stop the main motor. Press the tail of the stitch spacing lifting shaft 8 with your hand and turn handwheel 2. This will cause the first main shaft 3 and the second main shaft 5 to drive the guide seat 10, eccentric sleeve 17, and stitch spacing eccentric wheel 18 to rotate synchronously until one end of the stitch spacing lifting shaft 8 is engaged in a notch on one side of the stitch spacing eccentric wheel 18. At this point, turning handwheel 2 forward or in the opposite direction will keep the stitch spacing eccentric wheel 18 stationary under the constraint of the stitch spacing lifting shaft 8. The first main shaft 3 and the second main shaft 5 will only drive the guide seat 10 and the eccentric sleeve 17. The synchronous rotation of the sleeve 17 causes the eccentric wheel 18 to rotate relative to the first main shaft 3 and the second main shaft 5, thereby increasing or decreasing the hinge center position of the eccentric sleeve 17 and the feed rod 16, and thus adjusting the eccentricity of the feed rod 16 with respect to the first main shaft 3 and the second main shaft 5. This correspondingly increases or decreases the swing amplitude, feed amount and stitch length of the feed rod 16. The entire process, combined with the deceleration effect in the gearbox 4 and the monitoring of the built-in probe 6, allows for more precise adjustment of the stitch length, ensuring that the adjustment structure is suitable for more complex adjustment environments.

[0025] The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. The substitutions may be replacements of some structures, devices, or method steps, or they may be complete technical solutions. Equivalent substitutions or modifications made based on the technical solution and inventive concept of this utility model should all be covered within the protection scope of this utility model.

Claims

1. A stitch pitch adjustment device for a lockstitch machine, comprising a housing (1) and a handwheel (2) mounted on one side of the housing (1), wherein the output end of the handwheel (2) is connected to a first main shaft (3), and a reduction gearbox (4) is also mounted on the inner wall of the housing (1), wherein a second main shaft (5) is provided on one side of the reduction gearbox (4), characterized in that, Also includes: Precision control mechanism: The precision control mechanism includes a gear disk (11) disposed in the gearbox (4), a sun gear (12) is provided at one end of the first main shaft (3) that extends into the gearbox (4), three planetary gears (13) are provided between the sun gear (12) and the gear disk (11) at equal distances, and the three planetary gears (13) mesh with the sun gear (12) and the gear disk (11) respectively, and the same planet carrier (14) is movably connected to one side of the outer wall of the three planetary gears (13), one end of the planet carrier (14) is fixed to one end of the second main shaft (5), and an internal probe (6) is provided on the top outer wall of the housing (1); Adjustment mechanism: The adjustment mechanism is connected to one end of the second main shaft (5).

2. The stitch length adjustment device for an overlock machine according to claim 1, characterized in that, The gear plate (11) is fixedly connected to the gearbox (4).

3. A gauge adjustment device for a serging machine according to claim 1, wherein, The adjustment mechanism includes a guide seat (10) disposed at one end of the second main shaft (5), a connecting sleeve (15) is provided on one side of the guide seat (10), a feeding rod (16) is provided on one side of the outer wall of the connecting sleeve (15), a feeding shaft (7) is provided at one end of the feeding rod (16), and the built-in probe (6) is located above the feeding rod (16).

4. A gauge adjustment device for a serging machine according to claim 3, wherein, An eccentric sleeve (17) is connected to the inner wall of the connecting sleeve (15) via a bearing. The inner wall of the eccentric sleeve (17) is provided with a needle spacing connection part. Guide wedges are provided on both outer walls of the eccentric sleeve (17). A needle spacing eccentric wheel (18) is provided on one outer wall of the connecting sleeve (15). A first guide groove and a second guide groove are provided on the opposite outer walls of the needle spacing eccentric wheel (18) and the guide seat (10). One end of the two guide wedges is adapted to the interior of the first guide groove and the second guide groove, respectively.

5. The stitch length adjustment device for an overlock machine according to claim 4, characterized in that, The opening needle distance eccentric wheel (18) has a groove on one side, a slider (19) on the inner wall of the groove, a snap-fit ​​block on one side of the outer wall of the slider (19), a toothed groove on the inner side wall of the snap-fit ​​block, a ratchet (20) on one side of the outer wall of the opening needle distance eccentric wheel (18), and a limiting gear on the side of the ratchet (20) near the opening needle distance eccentric wheel (18), the limiting gear being adapted to the toothed groove on the snap-fit ​​block.

6. A gauge adjustment device for a serging machine according to claim 5, wherein, A torsion spring is connected between the eccentric wheel (18) and the slider (19).

7. A gauge adjustment device for a serging machine according to claim 1, wherein, The housing (1) is provided with a needle spacing lifting torsion shaft (8) on one side, and a return spring (21) is provided on the outer wall of the needle spacing lifting torsion shaft (8).

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