Automatic sewing machine capable of fast jump stitching

Details Automatic sewing machine capable of fast jump stitching Automatic sewing machine capable of fast jump stitching

1992-04-10

1992-11-03

Nerbun, Peter

Sewing

Special machines

Darning

112103, 112221, D05B 2100, D05C 504

Patent

active

051598884

ABSTRACT:
An automatic sewing machine having a needle-bar drive device for reciprocating a needle bar carrying a needle, a feed device for producing a relative movement between the needle bar and a work fabric, a feed control device for controlling the feed device according to stitch data indicative of needle positions, and a needle-bar jump device for disconnecting the needle bar from the needle-bar drive device and for holding the needle bar at a predetermined position above the fabric. The sewing machine is provided with a unique jump stitching arrangement operable, when the stitch length represented by a particular set of stitch data exceeds a maximum stitch length, for performing a jump stitching operation which includes: placing the feed control device in an inoperative state; placing the jump device and the feed device in operated states to produce a continuous relative movement of the needle bar and fabric; and restoring the feed control and jump devices to an operative state and a non-operated state, respectively, when a needle position represented by said particualr set of stitch data is reached by the continuous relative movement.

REFERENCES:
patent: 4325313 (1982-04-01), Kawai et al.
patent: 4506612 (1985-03-01), Yanagi
patent: 4665847 (1987-05-01), Takano et al.
patent: 4776291 (1988-10-01), Tajima et al.
patent: 4858542 (1989-08-01), Kato et al.

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