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Method and apparatus for forming single-thread chain sewing end knot

A chain and single-thread technology, applied in the field of chain-stitch sewing machines, can solve the problems of high technical cost of single-thread chain-stitch sewing machines

Inactive Publication Date: 2007-11-07
G M PFAFF AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can be used, on the one hand, during the formation of each stitch in an advancing stitch formation, and on the other hand for end knotting, but here in view of the fact that in order to form a double stitch, the front region of the stitch is rotated 180°, and the front stitch so formed must be placed under the rear stitch thus formed, the technical expense of a single-thread chain stitch sewing machine suitable for implementing this method is relatively high

Method used

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  • Method and apparatus for forming single-thread chain sewing end knot
  • Method and apparatus for forming single-thread chain sewing end knot
  • Method and apparatus for forming single-thread chain sewing end knot

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Experimental program
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Embodiment Construction

[0041] First, the method will be described below, followed by a chain stitch sewing machine manufactured for carrying out the method.

[0042] FIG. 1 shows the state of the coil at the beginning of formation of the end knot. The loop A formed in the previous stitch at this moment is still hanging on the shuttle. It extends from the sewing product to the shuttle via the auxiliary thread catcher in its forward reverse position. The needle is in the needle bar stroke position, then it leaves this position and goes up. The next stitch B is formed, into which the tip of the shuttle is squeezed. The stop pin moves toward the needle from its rear reverse position, when the pin tip is inserted into neither coil A nor coil B. But the tip of the stop pin is located not far in front of the coil B. When the shuttle continues to rotate, the coil A hanging on the shuttle moves toward the tip of the shuttle on the back of the shuttle, and is about to fall off the back of the shuttle. At t...

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Abstract

The present invention relates to a method and a device for forming an end knot when using a single yarn stitching sartorius to seam. A yarn loop B of a stitch which is formed before the last needle and caught by a looper after over a yarn stitching passes through a yarn loop A of the former stitch formed and caught by a looper, the two yarn loops are circling with a block pin. A yarn loop C formed at the last needle passes through the yarn loop B by the looper at a time, and the torsion formed by the guide of the yarn loop B through encircling the looper is finished at this time, but the yarn loop B is not fell off from the looper.

Description

technical field [0001] The present invention relates to a method for forming an end knot for a single-thread chain seam, and to a chain stitch sewing machine. Background technique [0002] When producing a seam with a single-thread chainstitch sewing machine, the sewing loops of the previous stitch are opened so that the needle can guide the thread through the loop of the previous stitch during the subsequent stitch. Each subsequent stitch thus fixes the stitch of each previous stitch. But because the loops allow each subsequent loop to pass through almost unimpeded, single-thread chain stitches are relatively easy to unravel against the direction in which the stitches were formed. [0003] For securing the ends of single-thread chain stitches, therefore, end knots are known in which especially the last stitch loop is prevented from coming off by the knot. [0004] For this reason, in the method by DE 196 41 638 A1 and in the sewing machine that is used for carrying out th...

Claims

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Application Information

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IPC IPC(8): D05B1/06D05B57/02D05B63/00D05B3/14D05B57/04D05B57/32D05B61/00D05B65/06D06F57/06
CPCD05B3/14D05B57/02D05B1/06D05B57/32D05B61/00
Inventor 克尔西·奥托
Owner G M PFAFF AG
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