Seam ravel preventing apparatus and ravel preventing method for stitches

A technology of stitches and needle thread loops, which is applied in the field of fray prevention devices, can solve problems such as insufficient fastening, and achieve the effects of preventing fraying, simple structure, and preventing fraying

Active Publication Date: 2015-01-14
YAMATO SEWING MASCH MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] For example, in the sewing of thin sewing materials and soft sewing materials, in order to obtain a good finished state, the tension applied to the needle threads 6, 6 and the looper threads 7 is reduced, because the needle thread loops 6a, 6b are Insufficient fastening of the looper thread 7 causes the above-mentioned problems

Method used

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  • Seam ravel preventing apparatus and ravel preventing method for stitches
  • Seam ravel preventing apparatus and ravel preventing method for stitches
  • Seam ravel preventing apparatus and ravel preventing method for stitches

Examples

Experimental program
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Embodiment approach 2

[0090] The stitch fraying prevention device of Embodiment 2 includes a thread hanging hook 3 and a limit lever 4 , and also includes a swing lever 9 . Such as Figure 15 As shown, the thread hook 3 is supported so as to be able to swing around a support shaft 34 in the vertical direction on the upper surface of the needle plate base 10 on which the needle plate P is attached. The support shaft 34 is located in the vicinity of the needle plate P on the right rear side of the needle plate P. As shown in FIG.

[0091] The line hook 3 has an arcuate curved shape, and is connected to the front end portion of a support arm 3 e extending leftward from a support shaft 34 so as to be folded forward. On the lower side of the needle plate P, the front end of the thread hook 3 is adjacent to the needle dropping positions A, A from the rear left side, and an outwardly protruding hook portion 3b is provided at the front end. The support arm 3e also extends forward from the support shaft 3...

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Abstract

The present invention provides a seam ravel preventing apparatus and seam ravel preventing method for stiches. In the invention, a thread hanging hook is arranged on the rear side of a needle drop position. The thread hanging hook swings at the end of sewing when a looper brought into advanced state. The hook at the tip of thread hanging hook and near the rear side of the looper, holds the multiple needle threads ring caught by looper at an advance end. In the invention, perform at least one stich in this state, let the needle of needle thread ring hold by the thread hanging hook down for passing, use the need thread hold by the needle to make the above mentioned needle thread ring connect automatically, and prevents looper thread ravel which pressing the looper thread by the automatically connect part. Thereby effectively prevent seam ravel occurred that is specific to double chain stitching.

Description

technical field [0001] The present invention relates to a thread fray prevention method for preventing fraying that occurs at a seam at the end of sewing in stitches of double lockstitch formed by a needle thread and a looper thread using a sewing machine such as a double thread lockstitch sewing machine and a lockstitch sewing machine, and A fray preventing device for carrying out the method. Background technique [0002] The double-thread overlock sewing machine includes: a plurality of needles that keep the needle thread rising and falling, and a looper that keeps the looper thread advancing and retreating in the direction of the arrangement of the needles. A plurality of needles penetrate the sewing material on the needle board, descend, pull out the sewing material, and rise. The looper advances and retreats under the needle plate in conjunction with the raising and lowering of the needles, and catches the needle thread loop (needle thread loop) held by the rising need...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D05B19/12D05B47/00D05B1/10
CPCD05B1/10D05B57/06D05B57/30D05B57/32D05B57/34
Inventor 桥本诚治引地耕一
Owner YAMATO SEWING MASCH MFG CO LTD
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