一种弯针传动结构及缝纫机
By introducing a ball block and ball bar design into the looper drive structure of the sewing machine, the swing amplitude of the looper crank is adjusted, solving the problem of the inability to adjust the looper stroke and improving the adaptability of the looper and the sewing effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG JACK SMART SEWING TECHNOLOGY CO LTD
- Filing Date
- 2025-07-15
- Publication Date
- 2026-07-17
AI Technical Summary
The existing looper drive structure of sewing machines cannot adjust the looper stroke, which cannot meet the needs of various needle positions, resulting in problems such as skipped stitches and poor stitches.
By setting a main spindle journal and a bending needle connecting rod on the main spindle, combined with the design of ball block and ball rod, the swing amplitude of the bending needle crank can be adjusted, changing the bending needle trajectory to adapt to different needle position requirements.
It enables adjustment of the looper stroke according to actual needs, improves the looper hooking speed and needle height, meets the needs of various needle positions, and improves sewing quality.
Smart Images
Figure CN224513801U_ABST
Abstract
Claims
1. A bending needle transmission structure, characterized in that, include: The main spindle has a main journal; a bent needle connecting rod is rotatably connected to the main journal. A bending needle shaft is fixedly connected to a bending needle holder, and the bending needle is set on the bending needle holder; The bend crank has one end fixedly connected to the bend shaft and the other end provided with a mounting groove; a ball groove is provided at the end of the bend connecting rod away from the main journal, and a ball block that mates with it is provided in the ball groove, and a ball rod that is fixedly connected to the mounting groove is provided on the ball block.
2. The curved needle drive structure of claim 1, wherein, The mounting slot is set along the length of the bent crank, and the ball rod passes through the mounting slot and is threaded into the mounting nut.
3. The curved needle drive structure of claim 1 or 2, wherein, A contact platform is provided in the circumferential direction of the cue stick, and a limit block is provided on the contact platform. Limiting surfaces that are adapted to the side walls of the mounting groove are provided on both sides of the limit block. The limit block is slidably disposed in the mounting groove, and the contact platform abuts against the side wall of the bent needle crank.
4. The curved needle drive structure of claim 1, wherein, The end of the bend crank away from the mounting groove is bent to form a crank bend. A crank hole is provided in the center of the crank bend, and the bend shaft passes through the crank hole. A first crank hole and a second crank hole are respectively provided on both sides of the opening of the crank bend. The crank bolt passes through the first crank hole and is threaded into the second crank hole.
5. The curved needle drive structure of claim 1, wherein, One end of the bent needle holder is bent into a needle holder bend, and a first needle holder hole and a second needle holder hole are respectively provided on both sides of the opening of the needle holder bend; the needle holder bolt passes through the first needle holder hole and is threadedly connected to the second needle holder hole.
6. The curved needle drive structure of claim 1 or 2 or 4 or 5, wherein, The bent needle connecting rod includes a main rod body, and the two ends of the main rod body are respectively provided with a first connecting rod opening and a second connecting rod opening; The first connecting rod opening and the first connecting rod locking block cooperate to form the first connecting hole, and the main shaft journal passes through the first connecting hole; The second link opening and the second link locking block cooperate to form the second connecting hole, and the ball block is adapted to the second connecting hole.
7. The curved needle drive structure of claim 6, wherein, Arc-shaped grooves are provided on the inner wall of the second link opening and the inner wall of the second connecting lock block; the arc-shaped grooves on the second link opening and the second link lock block cooperate to form a ball groove surrounding the outer surface of the ball block.
8. The curved needle drive of claim 1, wherein the curved needle drive is configured to rotate the curved needle about the longitudinal axis of the curved needle. The end of the bending needle holder away from the bending needle shaft is provided with a bending needle mounting seat, and the bending needle mounting seat is provided with a bending needle mounting hole; the bending needle is provided with a bending needle mounting head that mates with the bending needle mounting hole.
9. The curved needle drive structure of claim 8, wherein, The bending needle mounting base is provided with a mounting side hole, which is connected to the side wall of the bending needle mounting hole; a side hole bolt is provided in the mounting side hole; the side hole bolt passes through the mounting side hole and abuts against the bending needle mounting head.
10. A sewing machine characterized by comprising: Includes the bent needle transmission structure as described in any one of claims 1 to 9.