Stitch length adjusting structure of sewing machine

Abstract

The utility model provides a stitch length adjusting structure of a sewing machine, and belongs to the technical field of sewing machines. The problem that needle pitch adjustment of an existing sewing machine is troublesome is solved. The stitch length adjusting structure of the sewing machine comprises a feeding eccentric wheel assembly connected to a main shaft of the sewing machine in a sleeving mode, a driving source fixedly connected to the head end of a machine body of the sewing machine, an adjusting rod, an adjusting shaft rotatably arranged in the machine body in a penetrating mode and an adjusting plate, one end of the adjusting rod is fixedly connected with the outer end of the adjusting shaft, and the other end of the adjusting rod is movably connected with an output shaft of the driving source. One end of the adjusting plate is fixedly connected with the inner end of the adjusting shaft, and the other end of the adjusting plate can be embedded into the feeding eccentric wheel assembly. The stitch length adjusting structure of the sewing machine has the advantages that the stitch length can be automatically adjusted, and the labor intensity of operators is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to sewing machine technical field relates to a sewing machine needle spacing adjusting structure. BACKGROUND

[0002] Sewing machine is with one or more sewing line, on the seam material forms one or more line, makes one or more seam material interweave or sew up the machine. Sewing machine when sewing different seam material, need to adjust the needle spacing of sewing machine.

[0003] The existing sewing machine needle spacing adjusting structure, for example, Chinese patent literature discloses a kind of simple needle spacing adjusting mechanism of sewing machine and sewing machine [patent number: 201710294372.3;Application publication number: CN 107099938 B], in background technique, in conjunction with the description attached Figure 1 , the needle spacing adjusting mechanism of this kind of structure of sewing machine, when adjusting, hand holds the tail of needle spacing twist shaft, rotates hand wheel, hand wheel drives main shaft, cloth feeding eccentric wheel, eccentric wheel and needle spacing eccentric wheel synchronous rotation, until the head of needle spacing twist shaft is stuck in the groove on the outer circumferential surface of needle spacing eccentric wheel, limit the rotation of needle spacing eccentric wheel;Again push slider to make the tooth on slider and ratchet wheel separate, at this time, continue to rotate hand wheel in positive direction or reverse direction, then can make needle spacing eccentric wheel rotate relative to main shaft, to adjust the position of cloth feeding connecting rod and the hinged center of eccentric wheel relative to main shaft, make the position angle of eccentric wheel relative to main shaft change, to realize the increase or shrinkage adjustment of needle spacing. After needle spacing adjustment, release needle spacing twist shaft, needle spacing twist shaft is reset under the action of spring, and is separated from the groove on the outer circumferential surface of needle spacing eccentric wheel, slider is reset under the action of torsion spring, and is re-engaged with ratchet wheel, to ensure that cloth feeding eccentric wheel, eccentric wheel and needle spacing eccentric wheel do not move relative to each other.

[0004] The needle spacing adjusting mechanism of this kind of structure needs two hands of operator to operate simultaneously, one hand is inserted into feeding eccentric wheel assembly, the other hand rotates hand wheel, drives the rotation of main shaft of sewing machine, changes the eccentric amount of needle spacing eccentric wheel, to realize the adjustment of needle spacing size. And sewing machine needs to frequently adjust needle spacing to meet the requirements of different sewing processes, this kind of manual adjustment mode requiring two hands of operator, is time-consuming and laborious, and cannot be accurately positioned, requires higher for operator, is not conducive to efficient production of clothing enterprise. SUMMARY

[0005] The utility model aims at the above problems existing in prior art, proposes a kind of sewing machine needle spacing adjusting structure, and the technical problems solved are how to make needle spacing realize automatic adjustment, reduce the labor intensity of operator.

[0006] The utility model discloses a sewing machine needle distance adjusting structure, including the feeding eccentric wheel assembly of the sleeve setting connection on the main shaft of sewing machine, its characterized in that, needle distance adjusting structure still includes the drive source of fixed connection in the first end of sewing machine body, adjusting lever, the adjustable shaft of rotatable and the adjusting plate of being set in the body, one end of adjusting lever with the outer end of adjustable shaft is fixedly connected, and the other end is movably connected with the output shaft of drive source, one end of adjusting plate with the inner end of adjustable shaft is fixedly connected, and the other end can be embedded into the feeding eccentric wheel assembly.

[0007] When the needle distance needs to be adjusted during sewing, the output shaft of the drive source is extended, the adjusting plate is rotated through the adjusting lever and the adjustable shaft, the other end of the adjusting plate is embedded into the feeding eccentric wheel assembly, the feeding eccentric wheel assembly is rotated by a certain angle through the rotation of the main shaft controlled by the motor of the sewing machine, the eccentricity is changed, and the feeding eccentric wheel assembly is connected with the feeding tooth assembly, so that the adjustment of the size of the needle distance is realized, then the output shaft of the drive source is retracted, the adjusting plate is reversely rotated through the adjusting lever and the adjustable shaft, the other end of the adjusting plate is separated from the feeding eccentric wheel assembly, and the needle distance adjustment is completed.

[0008] In the above-mentioned sewing machine needle distance adjusting structure, one end of the adjusting lever is fixedly connected with the outer end of the adjustable shaft through the first fastener, a first torsional spring is sleeved on the first fastener, one end of the first torsional spring acts on the body, and the other end acts on the other end of the adjusting lever. The first fastener can be a screw or a bolt, the first fastener is convenient for fixing the adjusting lever and the adjustable shaft, and the first fastener is outwardly convex, so that the first torsional spring can be installed. The setting of the first torsional spring makes the adjusting lever always press on the output shaft of the drive source, so that the adjusting lever does not deviate, and the rotation accuracy of the adjustable shaft is ensured.

[0009] In the above-mentioned sewing machine needle distance adjusting structure, the other end of the adjusting lever is fixedly connected with the second fastener, the output shaft of the drive source has a connection groove in the shape of a Chinese character, the second fastener is partially embedded in the connection groove, and the other end of the first torsional spring acts on the second fastener. The second fastener can be a screw or a bolt, the second fastener and the connection groove in the shape of a Chinese character are matched, so that the adjusting lever and the output shaft of the drive source can be movably connected and better matched. Meanwhile, the second fastener serves as a force carrier of the first torsional spring, so that the adjusting lever can always press on the output shaft of the drive source, and the adjusting lever does not deviate.

[0010] In the sewing machine needle spacing adjustment structure, the second fastener has a positioning groove arranged in a ring shape, and the groove wall of the connecting groove is embedded in the positioning groove. The positioning groove is arranged to axially position the output shaft of the driving source, thereby improving the stability and the adjustment accuracy of the needle spacing adjustment structure.

[0011] In the sewing machine needle spacing adjustment structure, the outer end of the adjustment shaft is outwardly protruded to form a limiting end, and the limiting end has a limiting groove arranged in a strip shape. One end of the adjustment rod is embedded in the limiting groove to position the adjustment rod and the adjustment shaft in the circumferential direction. The limiting end axially positions the adjustment shaft, and the limiting groove enables the adjustment rod to better drive the adjustment shaft to rotate, thereby improving the rotation accuracy of the adjustment shaft and the adjustment accuracy of the needle spacing adjustment structure.

[0012] In the sewing machine needle spacing adjustment structure, the adjustment rod is arranged in a strip shape, and the adjustment rod is arranged outside the machine body along the outer wall of the machine body. This structure makes the needle spacing adjustment structure compact.

[0013] In the sewing machine needle spacing adjustment structure, the machine body is fixedly connected with a shaft sleeve, the adjustment shaft passes through the shaft sleeve, and a sealing ring is arranged between the adjustment shaft and the shaft sleeve. The outer end of the adjustment shaft is located outside the machine body, and the inner end is located inside the machine body. The shaft sleeve enables the adjustment shaft to rotate smoothly, the sealing ring has a certain damping effect, prevents the adjustment shaft from loosening, improves the rotation accuracy of the adjustment shaft, and also seals.

[0014] In the sewing machine needle spacing adjustment structure, the adjustment plate is arranged inside the machine body.

[0015] In the sewing machine needle spacing adjustment structure, the driving source is arranged outside the machine body, and the driving source is a pneumatic cylinder, an oil cylinder or a telescopic motor. The driving source is arranged outside the machine body, does not occupy the internal space of the machine body, and does not need to adjust the positions of the internal components of the machine body, thereby slightly changing the sewing mechanism, improving the adaptability and reducing the cost.

[0016] In the above-mentioned sewing machine stitch adjustment structure, the feeding eccentric wheel assembly comprises an adjustment eccentric wheel, a ratchet wheel sleeved on the main shaft, a sliding plate arranged on the adjustment eccentric wheel and a second torsional spring, the adjustment eccentric wheel is provided with an embedding groove, the sliding plate can be moved to the embedding groove under the action of the torsional force of the second torsional spring, the ratchet on the sliding plate is engaged with the ratchet wheel under the action of the torsional force of the second torsional spring, and the other end of the adjustment plate is provided with a bent embedding head which can be embedded into the embedding groove and push away the sliding plate against the torsional force of the second torsional spring. When the stitch adjustment is required during sewing, the embedding head of the adjustment plate is embedded into the embedding groove, the sliding plate is pushed to move against the torsional force of the second torsional spring, the ratchet on the sliding plate is disengaged from the ratchet wheel, the main shaft is rotated to drive the feeding eccentric wheel assembly to rotate by a certain angle, the eccentricity is changed, and thus the size of the stitch is adjusted. Subsequently, the output shaft of the driving source is retracted, the embedding head of the adjustment plate is separated from the embedding groove, the embedding head of the adjustment plate no longer abuts against the sliding plate, the ratchet on the sliding plate is engaged with the ratchet wheel under the action of the torsional force of the second torsional spring, and the adjustment of the stitch is completed.

[0017] Compared with the prior art, the sewing machine stitch adjustment structure has the following advantages:

[0018] 1. The stitch adjustment structure is located at the first end of the machine body, so that the length of the adjustment shaft can be short, and the stitch adjustment structure occupies a small space.

[0019] 2. The stitch adjustment structure controls the engagement and disengagement of the ratchet on the sliding plate and the ratchet wheel through the driving source, and the adjustment is realized by rotating the main shaft driven by the motor, so that the degree of automation is high, the stitch is automatically adjusted, and the labor intensity of the operator is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a position diagram of the stitch adjustment structure in the sewing machine.

[0021] Figure 2 is a schematic diagram of the overall structure of the stitch adjustment structure.

[0022] Figure 3 is a schematic diagram of the driving source, the adjustment rod and other structures of the stitch adjustment structure.

[0023] Figure 4 is an exploded view of the driving source, the adjustment rod and other structures of the stitch adjustment structure.

[0024] Figure 5 is an exploded view of the sliding plate and the ratchet wheel of the stitch adjustment structure.

[0025] In the figure, 1, main shaft; 2, feeding eccentric wheel assembly; 21, adjusting eccentric wheel; 211, embedding groove; 22, ratchet wheel; 23, sliding plate; 231, ratchet tooth; 24, second torsion spring; 3, machine body; 4, driving source; 41, output shaft; 411, connecting groove; 5, adjusting rod; 6, adjusting shaft; 61, limiting end; 611, limiting groove; 7, adjusting plate; 71, embedding head; 8, first fastener; 9, first torsion spring; 10, second fastener; 101, positioning groove; 11, shaft sleeve; 12, sealing ring. DETAILED DESCRIPTION

[0026] The following is a specific embodiment of the utility model and further describes the technical scheme of the utility model in combination with the drawings, but the utility model is not limited to these embodiments.

[0027] As shown in Figure 1 , Figure 2 , the sewing machine comprises a main shaft 1, a feeding tooth assembly, a machine body 3 and a stitch length adjusting structure. The stitch length adjusting structure comprises a feeding eccentric wheel assembly 2, a driving source 4, an adjusting rod 5, an adjusting shaft 6, an adjusting plate 7, a first fastener 8, a first torsion spring 9, a second fastener 10, a shaft sleeve 11 and a sealing ring 12. The feeding eccentric wheel assembly 2 comprises an adjusting eccentric wheel 21, a ratchet wheel 22, a sliding plate 23 and a second torsion spring 24.

[0028] The adjusting eccentric wheel 21 and the ratchet wheel 22 are connected to the main shaft 1 in a sleeved manner, and the feeding eccentric wheel assembly 2 is connected to the feeding tooth assembly. As shown in Figure 5 , the feeding eccentric wheel assembly 2 is provided with the sliding plate 23 and the second torsion spring 24, and the ratchet tooth 231 on the sliding plate 23 is engaged with the ratchet wheel 22 under the action of the torsion force of the second torsion spring 24.

[0029] As shown in Figure 3 , Figure 4 , the driving source 4 is located outside the machine body 3, the driving source 4 is fixedly connected to the first end of the machine body 3, and the output shaft 41 of the driving source 4 has a connecting groove 411 in the shape of a Chinese character.

[0030] The adjusting rod 5 is in the shape of a long strip, the adjusting rod 5 is located outside the machine body 3, the adjusting rod 5 is arranged along the outer wall of the machine body 3, the shaft sleeve 11 is fixedly connected in the machine body 3, the adjusting shaft 6 penetrates through the shaft sleeve 11, the sealing ring 12 is arranged between the adjusting shaft 6 and the shaft sleeve 11, and the outer end of the adjusting shaft 6 is located outside the machine body 3 and the inner end is located inside the machine body 3.

[0031] The outer end of the adjusting shaft 6 is outwardly convex in the circumferential direction and forms a limiting end 61, the limiting end 61 has a limiting slot 611 in the shape of a long strip, one end of the adjusting rod 5 is embedded in the limiting slot 611 to position the adjusting rod 5 in the circumferential direction of the adjusting shaft 6, the one end of the adjusting rod 5 is fixedly connected to the outer end of the adjusting shaft 6 through the first fastener 8, the other end of the adjusting rod 5 is fixedly connected to the second fastener 10, the second fastener 10 has a positioning slot 101 in the shape of a ring-shaped recess, the second fastener 10 is partially embedded in the connecting slot 411, and the slot wall of the connecting slot 411 is embedded in the positioning slot 101. The first torsional spring 9 is sleeved on the first fastener 8, one end of the first torsional spring 9 acts on the machine body 3, and the other end of the first torsional spring 9 acts on the second fastener 10.

[0032] The adjusting plate 7 is located in the machine body 3, one end of the adjusting plate 7 is fixedly connected to the inner end of the adjusting shaft 6, the other end of the adjusting plate 7 has an embedded head 71 which is bent, the adjusting eccentric wheel 21 of the feeding eccentric wheel assembly 2 has an embedded slot 211, the slide plate 23 can be moved to the embedded slot 211 under the action of the torsional force of the second torsional spring 24, the embedded head 71 is embedded in the embedded slot 211 and pushes away the slide plate 23 against the torsional force of the second torsional spring 24, so that the ratchet teeth 231 on the slide plate 23 are disengaged from the ratchet wheel 22.

[0033] When the stitch length needs to be adjusted during sewing, the output shaft 41 of the driving source 4 is extended, the adjusting rod 5 and the adjusting shaft 6 drive the adjusting plate 7 to rotate, the embedded head 71 of the adjusting plate 7 is embedded in the embedded slot 211 of the feeding eccentric wheel assembly 2 of the adjusting eccentric wheel 21, the other end of the adjusting plate 7 makes the ratchet teeth 231 on the slide plate 23 disengage from the ratchet wheel 22 against the torsional force of the second torsional spring 24, the main shaft 1 of the sewing machine is driven to rotate by the motor to drive the feeding eccentric wheel assembly 2 to rotate by a certain angle, the eccentricity is changed, so that the size of the stitch length is adjusted, then the output shaft 41 of the driving source 4 is retracted, the adjusting rod 5 and the adjusting shaft 6 drive the adjusting plate 7 to rotate in the opposite direction, the embedded head 71 is separated from the embedded slot 211, the ratchet teeth 231 on the slide plate 23 are engaged with the ratchet wheel 22 under the action of the torsional force of the second torsional spring 24, and the adjustment of the stitch length is completed.

[0034] The specific embodiments described herein are merely illustrative of the spirit of the present application. Those skilled in the art to which the present application belongs can make various modifications or supplements to the described specific embodiments or replace them with similar ways, but will not deviate from the spirit of the present application or exceed the scope defined by the appended claims.

[0035] Although the terms spindle 1, feeding eccentric wheel assembly 2, adjusting eccentric wheel 21, embedding groove 211, ratchet wheel 22, sliding plate 23, ratchet tooth 231, second torsion spring 24, machine body 3, driving source 4, output shaft 41, connecting groove 411, adjusting rod 5, adjusting shaft 6, limiting end 61, limiting groove 611, adjusting plate 7, embedding head 71, first fastener 8, first torsion spring 9, second fastener 10, positioning groove 101, shaft sleeve 11, sealing ring 12 and the like are used more frequently in the text, the possibility of using other terms is not excluded. The use of these terms is only for the convenience of describing and explaining the essence of the utility model; it is against the spirit of the utility model to interpret them as any kind of additional limitation.

Claims

1. A stitch length adjusting structure of a sewing machine, comprising a feed eccentric assembly (2) connected to a main shaft (1) of the sewing machine, characterized in that, The stitch length adjusting structure further comprises a driving source (4) fixed to the front end of the sewing machine body (3), an adjusting rod (5), a rotatable adjusting shaft (6) penetrating through the body (3), and an adjusting plate (7), one end of the adjusting rod (5) is fixed to the outer end of the adjusting shaft (6), the other end is movably connected to the output shaft (41) of the driving source (4), one end of the adjusting plate (7) is fixed to the inner end of the adjusting shaft (6), the other end can be embedded into the feeding eccentric wheel assembly (2).

2. The stitch length adjusting structure according to claim 1, wherein One end of the adjusting rod (5) is fixed to the outer end of the adjusting shaft (6) through a first fastener (8), a first torsion spring (9) is sleeved on the first fastener (8), one end of the first torsion spring (9) acts on the body (3), the other end acts on the other end of the adjusting rod (5).

3. The stitch length adjusting structure according to claim 2, wherein The other end of the adjusting rod (5) is fixed with a second fastener (10), the output shaft (41) of the driving source (4) has a connection groove (411) in the shape of a Chinese character "fang", the second fastener (10) is partially embedded in the connection groove (411), the other end of the first torsion spring (9) acts on the second fastener (10).

4. The stitch length adjusting structure according to claim 3, wherein The second fastener (10) has a positioning groove (101) in the shape of a ring recess, the groove wall of the connection groove (411) is embedded in the positioning groove (101).

5. The stitch length adjusting structure according to claim 1 or 2 or 3 or 4, wherein The outer end of the adjusting shaft (6) is outwardly convexly arranged along the circumference to form a limiting end (61), the limiting end (61) has a limiting groove (611) in the shape of a long strip, one end of the adjusting rod (5) is embedded in the limiting groove (611) to position the adjusting rod (5) and the adjusting shaft (6) circumferentially.

6. The stitch length adjusting structure according to claim 1 or 2 or 3 or 4, wherein The adjusting rod (5) is in the shape of a long strip, the adjusting rod (5) is located outside the body (3), and the adjusting rod (5) is arranged along the outer wall of the body (3).

7. The stitch length adjusting structure according to claim 1 or 2 or 3 or 4, wherein The body (3) is fixed with a shaft sleeve (11), the adjusting shaft (6) penetrates through the shaft sleeve (11), a sealing ring (12) is arranged between the adjusting shaft (6) and the shaft sleeve (11), the outer end of the adjusting shaft (6) is located outside the body (3), and the inner end is located inside the body (3).

8. The stitch length adjusting structure according to claim 1 or 2 or 3 or 4, wherein The adjusting plate (7) is located inside the body (3).

9. The stitch length adjusting structure according to claim 1 or 2 or 3 or 4, wherein The driving source (4) is located outside the body (3), and the driving source (4) is a pneumatic cylinder, an oil cylinder or a telescopic motor.

10. The stitch length adjusting structure according to claim 1 or 2 or 3 or 4, wherein The feeding eccentric wheel assembly (2) comprises an adjusting eccentric wheel (21), a ratchet wheel (22) sleeved on the main shaft (1), a sliding plate (23) arranged on the adjusting eccentric wheel (21) and a second torsional spring (24), the adjusting eccentric wheel (21) is provided with an embedded groove (211), the sliding plate (23) can be moved to the embedded groove (211) under the action of the torsion of the second torsional spring (24), the ratchet (231) on the sliding plate (23) is engaged with the ratchet wheel (22) under the action of the torsion of the second torsional spring (24), the other end of the adjusting plate (7) is provided with a bent embedded head (71), the embedded head (71) can be embedded into the embedded groove (211) and push away the sliding plate (23) against the torsion of the second torsional spring (24).

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