Multi-thread chain stitch sewing machine with seam ravel preventing apparatus

Abstract

A needle plate base (11) in a multi-thread chain stitch sewing machine with a seam ravel preventing apparatus is divided into a left needle plate base ( 11L) for attaching a needle plate ( P) thereto and supporting a swinging support shaft (30) of a thread hanging hook (3); and a right needle plate base (11R) for fixedly supporting a stopper member (4) and a thread handling air cylinder (32) and a stopper air cylinder (42). The right needle plate base(llR) is fastened to a sewing machine bed (B). The left needle plate base (11L) is fastenably and unfastenably fastened to an upper surface of the bed(B) via screw members (102). Adj ustment of stitch performation, and maintenance, e.g., replacement of various kinds of components stored inside the bed, can extremely easily and simply be carried out without having much trouble and requiring labor and time, and therefore, the stitch performation and predetermined ravel preventing function can be constantly surely reproduced.

Description

technical field [0001] The present invention relates to a double-chain-ring sewing machine with an anti-stitch opening device, which is mainly a sewing machine represented by a horizontal cylinder type double-chain sewing machine. The stitches of the double-chain sewing are formed by sutures and looper threads, and are used for Prevents unraveling at the end of the stitching of the above-mentioned double chain loop seam. Background technique [0002] A double chain sewing machine of a horizontal cylinder type or the like is a sewing machine including: one or more needles which hold and raise and lower a sewing thread; and a looper which holds a looper thread so that It advances and retreats in a direction approximately perpendicular to the upward and downward movement path of the above-mentioned needle, catches the suture loop formed by the above-mentioned needle under the needle plate by using the in-and-out motion of the above-mentioned looper, and uses the pair of looper ...

AI Technical Summary

Problems solved by technology

[0003] There are following problems in the stitches of the general double chain ring seam formed by the double chain ring sewing machine: as Figure 20 As shown, the end of the looper thread 10 that is cut off at the end of sewing is Figure 20 When stretched in the direction indicated by the middle arrow, the looper thread 10 will be pulled out from the final suture loops 20a, 20b formed by the sutures 20, 20. Yes, there will be open lines in the overall stitching

[0013] In particular, the air supply pipes 33 and 34 for supplying working gas to the above-mentioned cylinders 32 and 42 are connected to the online operation cylinder 32 and the limit cylinder 42. When removing and installing the needle plate table 11, it is necessary to install the above-mentioned air supply pipes. 33 and 43 are pulled out from the inside of the sewing machine base to prevent them from affecting the operation. After operation, it is very troublesome and time-consuming to press them into the inside of the sewing machine base again.

In addition, failure to carry out the troublesome and time-consuming adjustment and maintenance work mentioned above may result in reduced sewing performance, and the specified thread unraveling prevention function may not be reproduced.

Therefore, in any case, the very troublesome and time-consuming and labor-intensive work as mentioned above must be carried out, and there are technical problems to be improved at this point

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