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Computerized numerical control automatic sewing device (1 of 2 )

Edit: Smart Mold Technology Limited    Date: Sep 30, 2015



A CNC (Computerized Numerical Control) automatic sewing device comprises a sewing head and a workpiece holder movable in two co-ordinate directions perpendicular to one another for holding a workpiece to be sewn. A thread trimming device is provided adjacent to the stitch forming place and stationary relative to the latter and directly below the workpiece holder.
The invention relates to a CNC (Computerized Numeric Control) automatic sewing device comprising a sewing head having a stitch forming place with a thread cut-off device and a workpiece holder for holding a workpiece to be sewn, the sewing head and the workpiece holder being movable relative to one another in two co-ordinate directions by means of two carriages displaceable perpendicularly to one another each along a sliding path to produce a seam within an operating range of the workpiece holder, and a maxium sliding path in both co-ordinate directions being at least the same as the stretch of an operating range in the corresponding co-ordinate direction.

When sewing having sewing machines with a thread cut-off device, wherein the needle thread or upper thread, respectively, and the hook thread or lower thread, respectively, are automatically cut off at the end of the sewing action, there is the basic problem that the thread ends hanging down from the workpiece must be severed, i.e. the workpiece must be trimmed. The same applies to the thread ends at the starting point of the seam.

In order to solve this problem it is known for household sewing machines to secure clamping and cutting plates pivotably to the fabric presser foot and to provide a pivotably supported knife below the stitch plate, i.e. directly below the stitch hole. These two knifes are actuated by means of two electro-magnets to be actuated simultaneously. Thus the needle thread is cut off on the upper side of the workpiece and the lower thread is cut off directly below the stitch hole. With this thread cut-off device the cutting off of threads takes place in such a way that only infinitely short thread ends remain which need no more trimming.



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