Lock stitching and overlock stitching sewing machine

A lock stitching and overlock stitching sewing machine having a frame and primary driving means, comprising, in combination, a lock stitching device having a stitch forming part including a needle bar driving mechanism for forming lock stitches, said frame with said primary driving means forming an integral part of said lock stitching device;

• and an overlock stitching device having a stitch forming part spaced apart from said part for forming lock stitches and including a separate needle bar driving mechanism for forming overlock stitches, said overlock stitching device being disconnectably coupled to said lock stitching device;
• and wherein said overlock stitching device is coupled to the primary driving means at an increased reduction ratio with respect to that of said lock stitching device.

A lock stitching and overlock stitching sewing machine having a frame and primary driving means, comprising, in combination, a lock stitching device having a stitch forming part including a needle bar driving mechanism for forming lock stitches, said frame with said primary driving means forming an integral part of said lock stitching device;

• and an overlock stitching device having a stitch forming part spaced apart from said part for forming lock stitches and including a separate needle bar driving mechanism for forming overlock stitches, said overlock stitching device being disconnectably coupled to said lock stitches device;
• and further including a driving shaft for transmitting the movement of the primary driving means rotatable in the normal and reverse directions, and two clutches disposed on said driving shaft for rotation in opposite directions relative to each other.

A lock stitching and overlock stitching sewing machine having a frame and a primary driving means, comprising, in combination, a lock stitching device having a stitch forming part including a needle bar driving mechanism for forming lock stitches, said frame with said primary driving means forming an integral part of said lock stitching device;

• and an overlock stitching device having a stitch forming part spaced apart from said part for forming lock stitches and including a separate needle bar driving mechanism for forming overlock stitches, said overlock stitching device being disconnectably coupled to said lock stitching device;
• said overlock stitching device including a feeding mechanism having feeding teeth, a hollow shaft with an eccentric cam, said lock stitching device including an upper shaft and a lower shaft, said eccentric cam cooperating with the edges of said upper shaft and said lower shaft for transmitting horizontal and vertical feeding movementts to the feeding teeth.

A lock stitching and overlock stitching sewing machine having a frame and primary dirve means, comprising, in combination, a lock stitching device having a stitch forming part including a needle bar driving mechanism for forming lock stitches, said frame with said primary driving means forming an integral part of said lock stitching device;

• and an overlock stitching device having a stitch forming part spaced apart from said part for forming lock stitches and including a needle bar driving mechanism for forming overlock stitches, said frame including a bed, a stand on said bed, said stand having a recess at the rear area of the machine for accomodating said stitch forming part of the overlock stitching device, said overlock stitching device being disconnectably coupled to said lock stitching device, and further including a driving shaft for transmitting the movement of the primary driving means rotatable in the normal and reverse directions, and two clutches transposed on said driving shaft for rotation in opposite directions relative to each other.