Needle pitch knob device of sewing machine
By dividing the sewing machine's stitch length screw into two parts and utilizing the design of limiting teeth and return springs, the stitch length dial is self-locking, solving the problem of unstable stitch length, ensuring the consistency of stitch length during sewing, and improving product quality.
Patent Information
- Application Number
- CN202423225881.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-26
- Publication Date
- 2025-12-02
- Estimated Expiration
- 2034-12-26
AI Technical Summary
The existing sewing machine's stitch gauge locking device wears down after prolonged use, resulting in unstable stitch length and affecting the uniformity of the sewing stitches.
The pin pitch screw is divided into two parts: the pin pitch screw and the docking screw. A limiting tooth and a return spring are set on the docking screw. Self-locking is achieved through the limiting pin and the limiting spring. With the engagement and disengagement of the limiting tooth, the pin pitch dial is stably locked.
Maintaining a stable stitch length after prolonged use prevents shifting and ensures consistent stitch length during sewing, thereby improving product quality.
Smart Images
Figure CN223620604U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of sewing machine stitch pitch knob technology, specifically to a sewing machine stitch pitch knob device. Background Technology
[0002] Currently, the stitch length dial locking device of flatbed sewing machines wears out after prolonged use, resulting in unreliable stitch length locking. During operation, the stitch length shifts, causing unstable stitch length and inconsistent stitch size, which seriously affects product quality. Utility Model Content
[0003] In view of this, the present invention provides a sewing machine stitch distance knob device to solve the problem that the existing stitch distance dial locking device wears out after long-term use, causing the stitch distance to shift and resulting in uneven sewing stitches.
[0004] To address the problems existing in the prior art, the technical solution of this utility model is: a sewing machine stitch pitch knob device, including a stitch pitch screw, a docking screw, a dial seat, and a stitch pitch dial; a return spring is provided in the central guide hole of the docking screw, and a ring of limiting teeth is provided on the outer circumference of the middle part. A transverse sliding groove is provided on one side of the limiting teeth, dividing it into upper and lower parts. A mounting surface is provided at the top of the upper part, and a limiting spring is provided on the mounting surface. A dial seat is sleeved on the docking screw on the other side of the limiting teeth, and the stitch pitch dial passes through the dial seat and connects to the docking screw;
[0005] The pin-pitch screw is provided with a limiting groove and a limiting pin hole. A limiting pin is provided on the limiting pin hole. The pin-pitch screw extends into the guide hole of the docking screw and docks with the return spring. It is also locked in the sliding groove of the docking screw by the limiting pin. The limiting spring is in contact with the limiting groove of the pin-pitch screw.
[0006] Furthermore, the dial base is equipped with a zero position marker and a second limiting tooth, which engages with the first limiting tooth on the mating screw.
[0007] Furthermore, the zero-position marker is set vertically upwards.
[0008] Furthermore, the connecting screw is installed inside the screw hole of the sewing machine housing.
[0009] Furthermore, the dial holder is mounted on the second mounting surface of the sewing machine housing.
[0010] Compared with the prior art, the advantages of this utility model are as follows:
[0011] 1) This utility model divides the traditional pin pitch screw into two parts: the pin pitch screw and the connecting screw. Under the action of the spring and the limiting pin, they remain relatively stationary. When the pin pitch dial is in a free state, the pin pitch dial achieves self-locking because the limiting tooth one and the limiting tooth two mesh with each other, and the pin pitch size is stable.
[0012] 2) The structure of this utility model can easily adjust the needle spacing. When adjusting the needle spacing, the first limiting tooth and the second limiting tooth disengage. After adjustment, the first and the second limiting teeth disengage and re-engage, avoiding wear and failure of the locking device after long-term use.
[0013] 3) This utility model achieves the adjustment of stitch length while ensuring that the stitch length does not shift during operation, thus ensuring consistent stitch length during the sewing process and improving product quality. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the structure of this utility model.
[0015] Figure 2 This is a schematic diagram of the pin pitch screw of this utility model.
[0016] Figure 3 This is a schematic diagram of the structure of the connecting screw of this utility model.
[0017] Figure 4 This is a schematic diagram of the pin spacing seat of this utility model.
[0018] Figure 5 This is a diagram showing the fit between the connecting screw and the dial seat of this utility model.
[0019] Figure 6 This is a diagram showing the positional relationship of the parts in a free state, as provided by this utility model.
[0020] Figure 7 This is a diagram showing the positional relationship of parts when adjusting the needle spacing provided by this utility model.
[0021] Reference numerals in the attached diagram: 1-Pitch screw, 101-Limit groove, 102-Limit pin hole, 2-Limit pin, 3-Reset spring, 4-Limit spring, 5-Matching screw, 501-Limit tooth one, 502-Slide groove, 503-Mounting surface one, 504-Guide hole, 6-Dial base, 601-Zero mark point, 602-Limit tooth two, 7-Pitch dial, 8-Housing housing, 801-Mounting surface two, 802-Housing housing screw hole. Detailed Implementation
[0022] 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 based on the specific circumstances.
[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0024] This utility model discloses a sewing machine stitch length knob device that divides the traditional stitch length screw into two parts: a stitch length screw and a connecting screw. A first limiting tooth and a second limiting tooth are added to the connecting screw and the dial base. In the free state, the first limiting tooth and the second limiting tooth mesh with each other, locking the stitch length dial. When stitch length adjustment is needed, the stitch length dial is pressed down, disengaging the first limiting tooth and the second limiting tooth on the connecting screw and the dial base. Then, the stitch length dial is rotated to adjust the stitch length.
[0025] The specific structure is as follows: Figures 1-7 As shown, the sewing machine includes a stitch pitch screw 1, a docking screw 5, a dial holder 6, and a stitch pitch dial 7. The stitch pitch screw 1 and the docking screw 5 are sequentially installed in the screw holes 802 of the sewing machine housing 8. A return spring 3 is installed in the central guide hole 504 of the docking screw 5. A ring of limiting teeth 501 is provided on the outer circumference of the middle part. A transverse sliding groove 502 is provided on one side of the limiting teeth 501, dividing the docking screw 5 into upper and lower parts. The top of the upper part is provided with a mounting surface 503, and a limiting spring 4 is provided on the mounting surface 503. The dial holder 6 is sleeved on the docking screw 5 on the other side of the limiting teeth 501. The stitch pitch dial 7 passes through the dial holder 6 and connects to the docking screw 5. The dial holder 6 is provided with a zero position mark 601 and a limiting tooth 602. The zero position mark 601 is set vertically upward, and the limiting tooth 602 cooperates with the limiting tooth 501 on the docking screw 5.
[0026] As one embodiment of this invention, the pin-pitch screw 1 is provided with a limiting groove 101 and a limiting pin hole 102. A limiting pin 2 is provided on the limiting pin hole 102. The pin-pitch screw 1 extends into the guide hole 504 of the docking screw 5 and docks with the return spring 3. It is also locked in the sliding groove 502 of the docking screw 5 by the limiting pin 2. The limiting spring 4 is in contact with the limiting groove 101 of the pin-pitch screw 1.
[0027] As one embodiment of this invention, the dial base 6 is disposed on the mounting surface 801 of the sewing machine housing 8.
[0028] See Figure 5 , Figure 6 As shown, in the free state, the return spring 3 exerts a rightward force on the docking screw 5, while the limiting spring 4 is at the rightmost end of the limiting groove 101, restricting the movement of the dial 7 to the right. The two interacting forces keep the docking screw 5 stationary. The limiting tooth 501 on the docking screw 5 and the limiting tooth 602 on the dial seat 6 are on the same plane and mesh with each other, so the dial 7 is in a self-locking state.
[0029] See Figure 7 As shown, when adjusting the stitch pitch, press the stitch pitch knob 7. The first limiting tooth 501 on the docking screw 5 will disengage from the second limiting tooth 602 on the dial base 6. At the same time, press and rotate the stitch pitch knob 7. The slide groove 502 of the docking screw 5 will drive the limiting pin 2 to rotate. The limiting pin 2 will drive the stitch pitch screw 1 to rotate. When the desired position is reached, release the stitch pitch knob 7. The first limiting tooth 501 on the docking screw 5 and the second limiting tooth 602 on the dial base 6 will re-mesh each other, and the stitch pitch dial 7 will be in a self-locking state again.
[0030] The above description is only a preferred embodiment of the present utility model and is not intended to limit the scope of protection of the present utility model. It should be noted that any improvements and modifications made by those skilled in the art without departing from the principle of the present utility model should be considered as within the scope of protection of the present utility model.
Claims
1. A sewing machine stitch pitch knob device, characterized in that, It includes a pin pitch screw (1), a docking screw (5), a dial seat (6), and a pin pitch dial (7); a return spring (3) is provided in the central guide hole (504) of the docking screw (5), and a ring of limiting teeth (501) is provided on the outer circumference of the middle part. A transverse sliding groove (502) is provided on one side of the limiting teeth (501) of the docking screw (5), dividing it into upper and lower parts. A mounting surface (503) is provided at the top of the upper part, and a limiting spring (4) is provided on the mounting surface (503). A dial seat (6) is sleeved on the docking screw (5) on the other side of the limiting teeth (501), and the pin pitch dial (7) passes through the dial seat (6) and connects to the docking screw (5); The pin-pitch screw (1) is provided with a limiting groove (101) and a limiting pin hole (102). A limiting pin (2) is provided on the limiting pin hole (102). The pin-pitch screw (1) extends into the guide hole (504) of the docking screw (5) and docks with the return spring (3). It is also locked in the sliding groove (502) of the docking screw (5) by the limiting pin (2). The limiting spring (4) is in contact with the limiting groove (101) of the pin-pitch screw (1).
2. The sewing machine stitch pitch knob device according to claim 1, characterized in that, The dial base (6) is provided with a zero position mark (601) and a second limiting tooth (602), and the second limiting tooth (602) cooperates with the first limiting tooth (501) on the docking screw (5).
3. The sewing machine stitch pitch knob device according to claim 2, characterized in that, The zero-position marker (601) is set vertically upwards.
4. The sewing machine stitch pitch knob device according to claim 3, characterized in that, The docking screw (5) is located in the screw hole (802) of the sewing machine housing (8).
5. A sewing machine stitch pitch knob device according to claim 4, characterized in that, The dial holder (6) is mounted on the mounting surface (801) of the sewing machine housing (8).