Multithread 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 two sections: 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 sewing machine bed via screw members. Accordingly, adjustment of stitch performation, and maintenance, such as replacement of various kinds of components stored inside the sewing machine 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