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

Abstract

A needle plate base in a multi-thread chain stitch sewing machine with a seam ravel preventing apparatus is divided into a left needle plate base for attaching a needle plate thereto and supporting a swinging support shaft of a thread hanging hook; and a right needle plate base for fixedly supporting a stopper member and a thread handling air cylinder and a stopper air cylinder. The right needle plate base is fastened to a sewing machine bed. The left needle plate base is fastenably and unfastenably fastened to an upper surface of the bed via screw members. Adjustment 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

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a National Stage application of International Application No. PCT / JP2012 / 070714, filed on Aug. 7, 2012 and claims priority of Japanese application serial number 2011-183121 filed on Aug. 8, 2011, all of which are incorporated herein by reference in their entireties.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a multi-thread chain stitch sewing machine typically represented by a horizontal tube type multi-thread chain stitch sewing machine, which forms multi-thread chain stitch seams with a needle thread and a looper thread, and is provided with a seam ravel preventing apparatus for preventing a ravel from occurring in a certain portion at the end of sewing of multi-thread chain stitch seams.[0004]2. Background Art[0005]The horizontal tube type multi-thread chain stitch sewing machine includes one or more needles moving up and down while holding a needle thread, and a ...

AI Technical Summary

Benefits of technology

The present invention relates to a multi-thread chain stitch sewing machine with a seam ravel preventing apparatus. The technical effects of the invention include: preventing seam ravel in its developmental stage, easy attachment of the ravel preventing apparatus to the sewing machine bed, and efficient and easy adjustment and maintenance of the sewing machine performance. The invention also includes a stopper mechanism and a stopper actuator for disengaging the swing lever that engages with or disengages from the part of the stopper member. This allows for the use of a single acting type air cylinder as the stopper actuator, resulting in downsizing and cost reduction.

Problems solved by technology

The slipping-out is likely to propagate toward a sewing start point, thus causing ravel throughout the entirety of the seams.

However, the following problem that needs improvement remains unsolved in the multi-thread chain stitch sewing machine with the seam ravel preventing apparatus.

Therefore, it becomes necessary to perform extremely bothersome and time-consuming operation in which when removing and attaching the needle plate base 11, these two air tubes 33 and 43 are pulled out from inside the sewing machine bed so that both do not obstruct the removal and attachment operations, and after these operations, both air tubes are pushingly returned to the inside of the sewing machine bed.

However, unless the bothersome and time-consuming adjustment and maintenance operations are carried out, there is a probability that the stitch performation is deteriorated, and a predetermined ravel preventing function cannot be reproduced.

This necessitates the extremely bothersome and time and labor consuming operations.

This problem also still remains unsolved.

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