Stitch length adjusting mechanism and sewing machine

Abstract

The utility model belongs to sewing equipment technical field, especially point gauge adjusting mechanism and sewing machine, point gauge adjusting mechanism includes the shell, main shaft, eccentric transmission subassembly, swing feeding subassembly and adjusting assembly, adjusting assembly includes rotatably set up on the needle gauge adjusting crank of shell, driving piece that drives needle gauge adjusting crank rotation, needle gauge adjusting crank links up with swing feeding subassembly, eccentric transmission subassembly through connecting rod assembly to adjust the size of needle gauge, adjusting assembly still includes the display part that directly shows the current needle gauge size outward, the utility model discloses through the display part that directly shows outward in the point gauge adjusting mechanism, operator can intuitively, accurately read the current needle gauge numerical value, completely changed the traditional adjustment mode that depends on experience or repeatedly tries to sew. This not only significantly improves the accuracy of regulation and operation efficiency, but also enhances the ease of use and professional feeling of the equipment, makes sewing operation more convenient and reliable.

Description

Technical Field

[0001] This utility model belongs to the field of sewing equipment technology, specifically referring to a stitch length adjustment mechanism and a sewing machine. Background Technology

[0002] In industrial sewing equipment such as overlock machines, the stitch length needs to be adjusted according to different processes such as fabric thickness and stitch requirements. Existing stitch length adjustment mechanisms require the main shaft to rotate to change the eccentricity of the eccentric transmission component, thereby setting the stitch length.

[0003] However, this solution has the following limitations: First, because the adjustment process relies on changes in the spindle position, it cannot achieve dynamic and continuous adjustment of the stitch length during sewing machine operation and sewing. The machine must be stopped for operation, severely impacting the smoothness and efficiency of the work. Second, the adjustment mechanism lacks intuitive stitch length indicators; operators can only estimate based on experience or feel. After adjustment, one or more trial sewing sessions are often needed to verify if the stitch length meets the requirements, resulting in inaccurate adjustment, repeated adjustments, and wasted time and materials. Summary of the Invention

[0004] The purpose of this invention is to provide a stitch length adjustment mechanism and a sewing machine that can precisely adjust the stitch length.

[0005] This utility model is implemented as follows: One objective of this utility model is to provide a stitch pitch adjustment mechanism, including a housing, a main shaft, an eccentric transmission assembly, a oscillating feeding assembly, and an adjustment assembly. The adjustment assembly includes a stitch pitch adjustment crank rotatably mounted on the housing and a driving component for rotating the stitch pitch adjustment crank. The stitch pitch adjustment crank is linked with the oscillating feeding assembly and the eccentric transmission assembly through a connecting rod assembly to adjust the stitch pitch. The adjustment assembly also includes a display unit that directly displays the current stitch pitch.

[0006] In the above-mentioned needle pitch adjustment mechanism, the linkage assembly includes a first linkage connecting the oscillating feeding assembly and the eccentric transmission assembly, and the eccentric transmission assembly is further connected to a second linkage, which is connected to the needle pitch adjustment crank via an angle linkage.

[0007] In the above-mentioned stitch pitch adjustment mechanism, the driving component is a stitch pitch adjustment frame, which is fixedly connected to the stitch pitch adjustment crank and has an adjustment hole thereon. The stitch pitch adjustment frame is adjustablely connected to the machine housing through the adjustment hole by fasteners.

[0008] In the above-mentioned stitch pitch adjustment mechanism, one end of the stitch pitch adjustment crank extends out of the housing and a groove is provided on the end face of the crank. The stitch pitch adjustment frame is located outside the housing, and one end of the stitch pitch adjustment frame is placed in the groove. The two are fixed by fasteners.

[0009] In the above-mentioned stitch pitch adjustment mechanism, one end of the first connecting rod is hinged to the differential crank of the oscillating feeding assembly via a first pin. The other end of the first connecting rod, one end of the second connecting rod, and one end of the feeding connecting rod of the eccentric transmission assembly are all connected to the second pin, and the feeding connecting rod and the second pin are fixedly connected. The other end of the second connecting rod is connected to one end of the angle connecting rod via a third pin, and one end of the angle connecting rod is fixedly connected to the third pin. The other end of the angle connecting rod is fixedly connected to the stitch pitch adjustment crank.

[0010] In the above-mentioned stitch pitch adjustment mechanism, the stitch pitch adjustment crank is rotatably connected to the housing via a bushing.

[0011] In the above-mentioned stitch spacing adjustment mechanism, the stitch spacing adjustment frame is provided with a lever part that facilitates the rotation of the stitch spacing adjustment frame.

[0012] In the above-mentioned stitch length adjustment mechanism, the display section is a scale mark located on one side of the arc-shaped adjustment hole, used to indicate the stitch length size corresponding to the relative position of the stitch length adjustment frame.

[0013] Another objective of this invention is to provide a sewing machine that includes the aforementioned stitch length adjustment mechanism.

[0014] The outstanding advantages of this utility model compared to the prior art are: This invention achieves visualization of stitch length adjustment by integrating a display unit that directly faces outwards into the stitch length adjustment mechanism. Operators can intuitively and accurately read the current stitch length value, completely changing the traditional adjustment method that relies on experience or repeated trial stitches. This not only significantly improves the accuracy of adjustment and operational efficiency but also enhances the ease of use and professionalism of the equipment, making sewing operations more convenient and reliable. Furthermore, the stitch length adjustment mechanism allows for changes in stitch length during sewing, flexibly adapting to different sewing needs without interrupting the work, further expanding the flexibility and convenience of sewing. Attached Figure Description

[0015] Figure 1 This is one of the three-dimensional schematic diagrams of this utility model.

[0016] Figure 2 This is the second three-dimensional schematic diagram of this utility model.

[0017] Figure 3 This is an exploded view of the connecting rod assembly and adjusting assembly of this utility model.

[0018] Figure 4 This is a schematic diagram of the included angle of this utility model.

[0019] Figure 5 This is a schematic diagram of the needle pitch adjustment bracket of this utility model.

[0020] Figure 6 This is a schematic diagram of the pitch adjustment crank of this utility model.

[0021] In the diagram: 1. Main shaft; 2. Eccentric transmission assembly; 3. Oscillating feeding assembly; 4. Pitch adjustment crank; 5. First connecting rod; 6. Second connecting rod; 7. Angle connecting rod; 8. First pin; 9. Differential crank; 10. Fabric feeding connecting rod; 11. Second pin; 12. Third pin; 13. Bushing; 14. Pitch adjustment bracket; 15. Adjustment hole; 16. Fastener; 17. Groove; 18. Actuating part; 19. Scale marking. Detailed Implementation

[0022] The present invention will be further described below with reference to specific embodiments. See also: Figure 1-6 : One objective of this utility model is to provide a stitch pitch adjustment mechanism, which includes a housing, a main shaft 1, an eccentric transmission assembly 2, a swing feeding assembly 3, and an adjustment assembly. The adjustment assembly includes a stitch pitch adjustment crank 4 rotatably mounted on the housing and a driving component for rotating the stitch pitch adjustment crank 4. The stitch pitch adjustment crank 4 is linked with the swing feeding assembly 3 and the eccentric transmission assembly 2 through a connecting rod assembly to adjust the stitch pitch. The adjustment assembly also includes a display unit that directly displays the current stitch pitch.

[0023] This invention achieves visualization of stitch length adjustment by integrating a display unit that directly faces outwards into the stitch length adjustment mechanism. Operators can intuitively and accurately read the current stitch length value, completely changing the traditional adjustment method that relies on experience or repeated trial stitches. This not only significantly improves the accuracy of adjustment and operational efficiency but also enhances the ease of use and professionalism of the equipment, making sewing operations more convenient and reliable. Furthermore, the stitch length adjustment mechanism allows for changes in stitch length during sewing, flexibly adapting to different sewing needs without interrupting the work, further expanding the flexibility and convenience of sewing.

[0024] It should be noted that the eccentric transmission assembly 2 and the oscillating feeding assembly 3 are existing structures of sewing machines, and their specific structures will not be described in detail in this utility model.

[0025] Furthermore, the linkage assembly includes a first linkage 5 connecting the oscillating feeding assembly 3 and the eccentric transmission assembly 2, and the eccentric transmission assembly 2 is also connected to a second linkage 6, which is connected to the needle pitch adjusting crank 4 via an angle linkage 7.

[0026] The needle pitch adjusting crank 4 of this invention rotates, causing the angle connecting rod to move and changing the included angle A between the first and second connecting rods. This affects the motion trajectory of the eccentric transmission assembly 2, which in turn changes the amount of oscillation of the oscillating feeding assembly 3, thus altering the needle pitch. It should be noted that the smaller the included angle A, the smaller the amount of oscillation received by the oscillating feeding assembly 3, and the smaller the needle pitch; conversely, the larger the angle, the larger the needle pitch.

[0027] Specifically, one end of the first connecting rod 5 is hinged to the differential crank 9 of the oscillating feeding assembly 3 via the first pin 8. The other end of the first connecting rod 5, one end of the second connecting rod 6, and one end of the feeding connecting rod 10 of the eccentric transmission assembly 2 are all connected to the second pin 11, and the feeding connecting rod 10 and the second pin 11 are fixedly connected. The other end of the second connecting rod 6 is connected to one end of the angle connecting rod 7 via the third pin 12, and one end of the angle connecting rod 7 is fixedly connected to the third pin 12. The other end of the angle connecting rod 7 is fixedly connected to the needle pitch adjusting crank 4.

[0028] To ensure flexible rotation, the needle pitch adjustment crank 4 of this invention is rotatably connected to the housing via a bushing 13.

[0029] In this embodiment, the driving component is a stitch length adjustment bracket 14, which is fixedly connected to the stitch length adjustment crank 4 and has an adjustment hole 15. The stitch length adjustment bracket 14 is adjustablely connected to the machine housing via a fastener 16 passing through the adjustment hole 15. The fastener 16 is an adjustment screw. A threaded hole is provided at a corresponding position on the machine housing, and the adjustment screw is screwed into the threaded hole to lock the stitch length adjustment bracket 14 onto the machine housing, ensuring that the sewing machine maintains the current stitch length.

[0030] Furthermore, one end of the stitch pitch adjustment crank 4 extends out of the housing, and a groove 17 is provided on the end face of the crank. The stitch pitch adjustment bracket 14 is located outside the housing, and one end of the stitch pitch adjustment bracket 14 is placed in the groove 17. The two are fixed together by fasteners.

[0031] To facilitate the rotation of the stitch pitch adjustment frame 14, this invention provides a toggle part 18 on the stitch pitch adjustment frame 14. The toggle part 18 is specifically formed by bending the stitch pitch adjustment frame 14.

[0032] It should be noted that the display section is a scale mark 19 located on one side of the adjustment hole 15, used to indicate the stitch pitch size corresponding to the relative position of the stitch pitch adjustment bracket 14. For example, if the fastener 16 is aligned with one of the scale marks 19, the value corresponding to that scale mark is the current stitch pitch size, which is intuitively visible. The scale mark 19 can also be replaced by different colored punctuation marks, for example, red, yellow, blue, and white represent different stitch pitch sizes.

[0033] To adjust the stitch length, simply loosen the fastener 16, rotate the stitch length adjustment bracket 14, align the fastener 16 with the corresponding stitch length on the display, and then tighten the fastener 16 to fix the stitch length adjustment bracket 14 to the machine housing and lock it in place.

[0034] The above embodiments are only one of the preferred embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all equivalent changes made in accordance with the shape, structure and principle of this utility model should be covered within the protection scope of this utility model.

Claims

1. A needle pitch adjustment mechanism, comprising a housing, a main shaft (1), an eccentric transmission assembly (2), and a oscillating feeding assembly (3), characterized in that: It also includes an adjustment component, which includes a needle pitch adjustment crank (4) rotatably mounted on the housing and a drive component for rotating the needle pitch adjustment crank (4). The needle pitch adjustment crank (4) is linked with the oscillating feeding component (3) and the eccentric transmission component (2) through a connecting rod assembly to adjust the needle pitch size. The adjustment component also includes a display unit that directly displays the current needle pitch size to the outside.

2. The needle spacing adjustment mechanism according to claim 1, characterized in that: The linkage assembly includes a first link (5) connecting the oscillating feeding assembly (3) and the eccentric transmission assembly (2). The eccentric transmission assembly (2) is also connected to a second link (6), which is connected to the needle pitch adjusting crank (4) via an angle link (7).

3. A needle spacing adjustment mechanism according to claim 1 or 2, characterized in that: The driving component is a stitch pitch adjustment bracket (14), which is fixedly connected to the stitch pitch adjustment crank (4) and has an adjustment hole (15) on it. The stitch pitch adjustment bracket (14) is adjustablely connected to the housing through the adjustment hole (15) by fasteners.

4. The needle spacing adjustment mechanism according to claim 2, characterized in that: One end of the first connecting rod (5) is hinged to the differential crank (9) of the oscillating feeding assembly (3) via the first pin (8). The other end of the first connecting rod (5), one end of the second connecting rod (6), and one end of the feeding connecting rod (10) of the eccentric transmission assembly (2) are all connected to the second pin (11), and the feeding connecting rod (10) and the second pin (11) are fixedly connected. The other end of the second connecting rod (6) is connected to one end of the angle connecting rod (7) via the third pin (12), and one end of the angle connecting rod (7) is fixedly connected to the third pin (12). The other end of the angle connecting rod (7) is fixedly connected to the needle pitch adjusting crank (4).

5. The needle spacing adjustment mechanism according to claim 4, characterized in that: The needle pitch adjustment crank (4) is rotatably connected to the housing via a bushing (13).

6. The needle spacing adjustment mechanism according to claim 3, characterized in that: One end of the stitch pitch adjustment crank (4) extends out of the housing and a groove (17) is provided on the end face of the crank. The stitch pitch adjustment bracket (14) is located outside the housing and one end of the stitch pitch adjustment bracket (14) is set in the groove (17). The two are fixed by fasteners.

7. The needle spacing adjustment mechanism according to claim 3, characterized in that: The needle spacing adjustment frame (14) is provided with a lever (18) that facilitates the rotation of the needle spacing adjustment frame (14).

8. The needle spacing adjustment mechanism according to claim 3, characterized in that: The display section is a scale mark (19) located on one side of the adjustment hole (15), used to indicate the needle pitch size corresponding to the relative position of the needle pitch adjustment frame (14).

9. A sewing machine, characterized in that: Includes the needle spacing adjustment mechanism as described in any one of claims 1-8.

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