Stitch length adjusting structure and sewing machine

Abstract

The utility model relates to a stitch length adjusting structure and a sewing machine. The needle pitch adjusting structure comprises a main shaft and a machine shell, the main shaft is sleeved with a cloth feeding eccentric wheel assembly, a needle opening eccentric cam on the cloth feeding eccentric wheel assembly elastically abuts against a ratchet wheel in the axial direction, the ratchet wheel is fixed to the main shaft and meshed with teeth of the needle opening eccentric cam, and the main shaft is rotatably arranged in the machine shell. A main shaft motor, a linear driving assembly and a controller are fixed on the machine shell, the main shaft motor is in transmission connection with the main shaft, the driving end of the linear driving assembly penetrates into the machine shell and can be meshed with the needle opening eccentric cam teeth, and the main shaft motor and the linear driving assembly are both in signal connection with the controller; the sewing machine adopts the stitch length adjusting structure. According to the stitch length adjusting structure and the sewing machine, the stitch length can be automatically adjusted and is not limited by angles, the stitch length can be directly adjusted by the cloth feeding eccentric wheel assembly at any angle, the main shaft does not need to be rotated to a specified angle, and therefore the stitch length adjusting structure and the sewing machine are convenient to adjust.

Description

Technical Field

[0001] This utility model relates to the field of sewing equipment technology, and in particular to a stitch length adjustment structure and a sewing machine using the stitch length adjustment structure. Background Technology

[0002] Adjusting the stitch length on a traditional sewing machine requires manually pressing a button. This not only necessitates holding the button down continuously but also rotating the machine to the desired angle, making the adjustment inconvenient. Furthermore, sewing workers may increase the stitch length to speed up the process, resulting in inconsistent and uneven stitch lengths on garments.

[0003] CN206545102U discloses an automatic stitch length adjustment device for a sewing machine. This device allows the operating component to drive a push rod to automatically extend into the machine housing, eliminating the need for the operator to continuously hold the push rod when adjusting the stitch length. However, the operating component in this design is located on the radial side of the main shaft within the machine housing. Furthermore, the push rod must be inserted into the radial notch of the stitch length adjustment wheel and pushed away from the internal locking block before stitch length adjustment can be performed. This means that the automatic stitch length adjustment device can only adjust the stitch length when the main shaft has rotated to a certain angle, making adjustment still inconvenient. Additionally, the location of the operating component occupies the sewing operator's workspace, affecting the normal operation of the sewing process. Moreover, this automatic stitch length adjustment device does not consider the design related to locking the stitch length, making it impossible to prevent the sewing operator from arbitrarily increasing the stitch length, leading to inconsistent garment sewing quality. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a convenient stitch length adjustment structure and a sewing machine.

[0005] The present invention adopts the following technical solution:

[0006] This utility model provides a stitch length adjustment structure, including a main shaft and a housing. A feed eccentric wheel assembly is sleeved on the main shaft. The needle-opening eccentric cam and ratchet on the feed eccentric wheel assembly elastically abut against each other along the axial direction. The ratchet is fixed on the main shaft and meshes with the needle-opening eccentric cam. The main shaft is rotatably mounted inside the housing. A main shaft motor, a linear drive assembly, and a controller are fixed on the housing. The main shaft motor is connected to the main shaft drive. The drive end of the linear drive assembly passes through the housing and can mesh with the needle-opening eccentric cam. Both the main shaft motor and the linear drive assembly are signal connected to the controller.

[0007] Preferably, a pawl positioning sleeve is provided on the drive end of the linear drive assembly, and a radially penetrating receiving groove is provided on the needle-opening eccentric cam. A pawl abutment block is locked in the receiving groove. The pawl abutment block is provided with meshing teeth that can cooperate with the ratchet and the pawl positioning sleeve. The ratchet and the pawl abutment block elastically abut against each other along the axial direction.

[0008] Preferably, a pressure spring is sleeved on the main shaft, and the pressure spring is located between the pawl abutment block and the needle opening eccentric cam. The pawl abutment block is provided with an inner ring meshing tooth and an outer ring meshing tooth. The inner ring meshing tooth is used to cooperate with the ratchet, and the outer ring meshing tooth is used to cooperate with the pawl positioning sleeve.

[0009] Preferably, two pawl abutment blocks are symmetrically arranged in the receiving groove. Each pawl abutment block is hinged to the needle-opening eccentric cam via a connecting rod. A torsion spring is sleeved on the connecting rod, and the torsion spring abuts against both the pawl abutment block and the needle-opening eccentric cam.

[0010] Preferably, the fabric feeding eccentric wheel assembly includes a fabric feeding eccentric wheel, a sleeve eccentric wheel, and a feeding connecting rod. The fabric feeding eccentric wheel is fixed on the main shaft, the sleeve eccentric wheel is connected to the fabric feeding eccentric wheel and sleeved on the needle opening eccentric cam, and the feeding connecting rod is sleeved on the sleeve eccentric wheel.

[0011] Preferably, a needle roller bearing is provided between the sleeve eccentric wheel and the feeding connecting rod.

[0012] Preferably, the linear drive component is an electromagnet, and the linear telescopic rod of the electromagnet passes through the housing and can mesh with the teeth of the eccentric cam.

[0013] Preferably, a control panel with a password lock function is fixed on the housing, and the control panel is connected to the controller via a signal connection.

[0014] Preferably, the controller is connected to a remote IoT control system via signal connection.

[0015] This utility model also provides a sewing machine that employs any of the above-mentioned stitch length adjustment structures.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] The stitch length adjustment structure of this utility model locks the stitch length by engaging the axial teeth of the eccentric cam and the ratchet. When the stitch length needs to be adjusted, the controller controls the drive end of the linear drive component to abut against the eccentric cam and engage the teeth, thereby releasing the lock between the eccentric cam and the ratchet. Then, the controller controls the spindle motor to drive the spindle to rotate a certain angle, thus realizing the stitch length adjustment.

[0018] Obviously, the stitch length adjustment structure of this utility model can not only realize automatic stitch length adjustment, but is also not limited by angle. The feed eccentric wheel assembly can directly adjust the stitch length at any angle without rotating the main shaft to a specified angle, so the adjustment is convenient.

[0019] The sewing machine of this invention, by adopting the above-mentioned stitch length adjustment structure, naturally possesses the aforementioned beneficial effects, which will not be elaborated further here. Attached Figure Description

[0020] Figure 1 This is an overall schematic diagram of the needle spacing adjustment structure in an embodiment of this utility model.

[0021] Figure 2 This is a first partial exploded view of the needle spacing adjustment structure in this embodiment of the utility model.

[0022] Figure 3 This is a first structural diagram of the needle spacing adjustment structure with an eccentric cam, as described in this utility model embodiment.

[0023] Figure 4 This is a second partially exploded view of the needle spacing adjustment structure in this embodiment of the present invention.

[0024] Figure 5 This is a second structural diagram of the needle spacing adjustment structure with an eccentric cam, as described in this utility model embodiment.

[0025] The reference numerals in the attached figures are explained as follows:

[0026] 1. Spindle 4. Linear drive assembly

[0027] 2. Housing 401, pawl positioning sleeve

[0028] 201. Front bearing cover; 402. Linear telescopic rod

[0029] 3. Feeding eccentric wheel assembly 403, electromagnet bracket

[0030] 301. Opening needle eccentric cam; 5. Pressure spring

[0031] 302, ratchet 6, connecting rod

[0032] 303, pawl block 7, torsion spring

[0033] 304, Feed eccentric wheel 8, Needle roller bearing

[0034] 305, Eccentric Gear 9, Bearing

[0035] 306. Feeding Link Detailed Implementation

[0036] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. These embodiments are only used to illustrate this utility model and are not intended to limit it.

[0037] In the description of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0038] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0039] Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0040] See Figures 1 to 5 This embodiment provides a stitch length adjustment structure, including a main shaft 1 and a housing 2. A feed eccentric wheel assembly 3 is sleeved on the main shaft 1. The needle-opening eccentric cam 301 and ratchet 302 on the feed eccentric wheel assembly 3 elastically abut against each other along the axial direction. The ratchet 302 is fixed on the main shaft 1 and meshes with the needle-opening eccentric cam 301. The main shaft 1 is rotatably disposed in the housing 2. A main shaft motor, a linear drive assembly 4 and a controller are fixed on the housing 2. The main shaft motor is connected to the main shaft 1 for transmission. The drive end of the linear drive assembly 4 passes through the housing 2 and can mesh with the needle-opening eccentric cam 301. Both the main shaft motor and the linear drive assembly 4 are signal connected to the controller.

[0041] In this embodiment, the stitch length adjustment structure locks the stitch length through the axial gear engagement between the eccentric cam 301 and the ratchet 302. When stitch length adjustment is needed, the controller controls the drive end of the linear drive assembly 4 to abut against the eccentric cam 301 and engage the gears, thereby releasing the lock between the eccentric cam 301 and the ratchet 302. Then, the controller controls the main shaft motor to drive the main shaft 1 to rotate a certain angle, thus achieving stitch length adjustment. Obviously, the stitch length adjustment structure of this embodiment can not only achieve automatic stitch length adjustment, but is also not limited by angle. The feed eccentric wheel assembly 3 can directly adjust the stitch length at any angle without rotating the main shaft 1 to a specified angle, thus making adjustment convenient.

[0042] Preferably, see Figure 2 and Figure 4 The linear drive assembly 4 is provided with a pawl positioning sleeve 401 on the drive end. The needle-opening eccentric cam 301 is provided with a radially through receiving groove. A pawl abutment block 303 is locked in the receiving groove. The pawl abutment block 303 is provided with meshing teeth that can cooperate with the ratchet 302 and the pawl positioning sleeve 401. The ratchet 302 and the pawl abutment block 303 elastically abut against each other along the axial direction.

[0043] In the locked stitch length state, the ratchet 302 and the pawl abutment block 303 are axially abutted and meshed, and the ratchet 302 is fixed on the main shaft 1, causing the needle opening eccentric cam 301 to rotate with the main shaft 1. When the stitch length needs to be adjusted, the pawl positioning sleeve 401 on the linear drive assembly 4 is axially abutted and meshed with the pawl abutment block 303, and the ratchet 302 disengages from the state of meshing with the pawl abutment block 303. Since the linear drive assembly 4 is fixed on the machine housing 2, the needle opening eccentric cam 301 will not rotate with the main shaft 1. At this time, the stitch length can be adjusted by rotating the main shaft 1.

[0044] Preferably, see Figure 2 and Figure 3 In one specific embodiment, a pressure spring 5 is sleeved on the main shaft 1. The pressure spring 5 is located between the pawl abutment block 303 and the needle-opening eccentric cam 301. The pawl abutment block 303 is provided with inner and outer ring meshing teeth. The inner ring meshing teeth are used to cooperate with the ratchet wheel 302, and the outer ring meshing teeth are used to cooperate with the pawl positioning sleeve 401. The setting of the pressure spring 5 enables the pawl abutment block 303 and the ratchet wheel 302 to elastically abut against each other along the axial direction. After the needle pitch adjustment is completed, the controller controls the drive end of the linear drive assembly 4 to reset, and the pawl abutment block 303 can re-engage with the ratchet wheel 302 teeth under the action of the pressure spring 5.

[0045] Preferably, see Figure 4 and Figure 5In another specific embodiment, two pawl abutment blocks 303 are symmetrically arranged in the receiving groove. Each pawl abutment block 303 is hinged to the needle-opening eccentric cam 301 via a connecting rod 6. A torsion spring 7 is sleeved on the connecting rod 6, and the torsion spring 7 abuts against both the pawl abutment block 303 and the needle-opening eccentric cam 301. Similar to the pressure spring 5, the torsion spring 7 is also provided to enable the pawl abutment block 303 and the ratchet 302 to elastically abut along the axial direction. In the locked needle distance state, the two pawl abutment blocks 303 abut against the ratchet 302 axially and engage with the teeth under the action of the torsion spring 7. When the needle distance needs to be adjusted, the two pawl abutment blocks 303 disengage from the ratchet 302 under the action of the torsion spring 7 and abut against the pawl positioning sleeve 401 axially and engage with the teeth.

[0046] Preferably, see Figure 2 and Figure 4 The fabric feeding eccentric wheel assembly 3 includes a fabric feeding eccentric wheel 304, a sleeve eccentric wheel 305, and a feeding connecting rod 306. The fabric feeding eccentric wheel 304 is fixed on the main shaft 1. The sleeve eccentric wheel 305 is connected to the fabric feeding eccentric wheel 304 and sleeved on the needle opening eccentric cam 301. The feeding connecting rod 306 is sleeved on the sleeve eccentric wheel 305.

[0047] When the stitch length needs to be adjusted, the drive end of the linear drive assembly 4 abuts against the needle-opening eccentric cam 301 and engages with its teeth, while the ratchet 302 disengages from the needle-opening eccentric cam 301. At this time, the needle-opening eccentric cam 301 is fixed and cannot rotate with the rotation of the main shaft 1. Then, the main shaft 1 is rotated, which in turn drives the sleeved eccentric wheel 305 and the feeding rod 306 to rotate by the feeding eccentric wheel 304, changing the eccentricity of the feeding rod 306 relative to the main shaft 1, thus completing the stitch length adjustment. After the stitch length adjustment is completed, the drive end of the linear drive assembly 4 is reset, and the ratchet 302 can re-engage with the needle-opening eccentric cam 301, so that both the needle-opening eccentric cam 301 and the feeding eccentric wheel 304 can rotate with the rotation of the main shaft 1. At this time, the eccentricity of the feeding rod 306 relative to the main shaft 1 remains fixed and will not change due to the rotation of the main shaft 1.

[0048] Preferably, see Figure 2 and Figure 4 A needle roller bearing 8 is provided between the eccentric wheel 305 and the feeding connecting rod 306; and a bearing 9 is also provided between the ratchet 302 and the housing 2.

[0049] Preferably, see Figure 2 and Figure 4 The linear drive component 4 is an electromagnet, and the linear telescopic rod 402 of the electromagnet passes through the housing 2 and can mesh with the teeth of the needle-opening eccentric cam 301.

[0050] Better yet, see Figure 2 and Figure 4In this embodiment, the electromagnet bracket 403 on the electromagnet is fixed to the front bearing cover 201 of the housing 2 by screws.

[0051] Preferably, a control panel with a password lock function is fixed on the housing 2, and the control panel is connected to the controller signal; in addition, the controller can also be connected to a remote Internet of Things control system signal, so as to control the operation of the linear drive component 4 by setting a password or remote control, thereby preventing the sewing worker from changing the stitch length without authorization.

[0052] This embodiment also provides a sewing machine that employs the above-described stitch length adjustment structure. Because the stitch length adjustment structure uses axial gear meshing, the linear drive assembly 4 can be located at one axial end of the main shaft 1, avoiding interference with other structures on the machine housing 2, and without occupying the sewing worker's operating space.

[0053] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A needle spacing adjustment structure, characterized in that, The assembly includes a main shaft (1) and a housing (2). A feed eccentric wheel assembly (3) is sleeved on the main shaft (1). The needle-opening eccentric cam (301) and ratchet (302) on the feed eccentric wheel assembly (3) elastically abut against each other along the axial direction. The ratchet (302) is fixed on the main shaft (1) and meshes with the needle-opening eccentric cam (301). The main shaft (1) is rotatably disposed inside the housing (2). A main shaft motor, a linear drive assembly (4) and a controller are fixed on the housing (2). The main shaft motor is connected to the main shaft (1) for transmission. The drive end of the linear drive assembly (4) passes through the housing (2) and can mesh with the needle-opening eccentric cam (301). The main shaft motor and the linear drive assembly (4) are both connected to the controller for signal transmission.

2. The needle spacing adjustment structure according to claim 1, characterized in that, The linear drive assembly (4) is provided with a pawl positioning sleeve (401) at its drive end. The needle-opening eccentric cam (301) is provided with a radially penetrating receiving groove. A pawl abutment block (303) is inserted in the receiving groove. The pawl abutment block (303) is provided with meshing teeth that can cooperate with the ratchet (302) and the pawl positioning sleeve (401). The ratchet (302) and the pawl abutment block (303) elastically abut against each other along the axial direction.

3. The needle spacing adjustment structure according to claim 2, characterized in that, A pressure spring (5) is sleeved on the main shaft (1). The pressure spring (5) is located between the pawl abutment block (303) and the needle-opening eccentric cam (301). The pawl abutment block (303) is provided with an inner ring meshing tooth and an outer ring meshing tooth. The inner ring meshing tooth is used to cooperate with the ratchet (302), and the outer ring meshing tooth is used to cooperate with the pawl positioning sleeve (401).

4. The needle spacing adjustment structure according to claim 2, characterized in that, Two pawl abutment blocks (303) are symmetrically arranged in the receiving groove. Each pawl abutment block (303) is hinged to the needle-opening eccentric cam (301) by a connecting rod (6). A torsion spring (7) is sleeved on the connecting rod (6). The torsion spring (7) abuts against both the pawl abutment block (303) and the needle-opening eccentric cam (301).

5. The needle spacing adjustment structure according to claim 1, characterized in that, The fabric feeding eccentric wheel assembly (3) includes a fabric feeding eccentric wheel (304), a sleeve eccentric wheel (305), and a feeding connecting rod (306). The fabric feeding eccentric wheel (304) is fixed on the main shaft (1). The sleeve eccentric wheel (305) is connected to the fabric feeding eccentric wheel (304) and sleeved on the needle opening eccentric cam (301). The feeding connecting rod (306) is sleeved on the sleeve eccentric wheel (305).

6. The needle spacing adjustment structure according to claim 5, characterized in that, A needle roller bearing (8) is provided between the sleeve eccentric wheel (305) and the feeding connecting rod (306).

7. The needle spacing adjustment structure according to claim 1, characterized in that, The linear drive assembly (4) is an electromagnet, and the linear telescopic rod (402) of the electromagnet passes through the housing (2) and can mesh with the opening needle eccentric cam (301).

8. The needle spacing adjustment structure according to claim 1, characterized in that, A control panel with a password lock function is fixed on the housing (2), and the control panel is signal connected to the controller.

9. The needle spacing adjustment structure according to claim 1, characterized in that, The controller is connected to the remote Internet of Things (IoT) control system.

10. A sewing machine, characterized in that, The needle spacing adjustment structure described in any one of claims 1-9 is adopted.

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