Sewing machine for producing a stitch pattern

Details Sewing machine for producing a stitch pattern Sewing machine for producing a stitch pattern

1985-10-01

1987-01-27

Nerbun, Peter

Sewing

Stitch forming

Zigzag

112221, 112315, 1122661, D05B 302

Patent

active

046387528

ABSTRACT:
A sewing machine has an electronic control for the production of at least one stitch pattern consisting of a plurality of different single stitches, with a read-and-write memory RAM for storing in memory at least the single stitches of the stitch pattern and with a feed mechanism whose feed adjustment occurs by a step motor controlled in accordance with the stored data of the read-and-write memory within the inactive phase of the feed mechanism. To carry out a feed variation exceeding the maximum number of steps of the step motor between two predetermined sewing stitches, the control unit contains a comparator which compares the magnitude of the displacement amount of the step motor before the next displacing movement is carried out with a given maximum displacement amount, in order to prevent a stitch formation between the point of insertion of the previous stitch and the desired point of insertion of the next following stitch when the maximum displacement amount is exceded.

REFERENCES:
patent: 4242974 (1981-01-01), Beckerman
patent: 4325313 (1982-04-01), Kawai et al.
patent: 4342271 (1982-08-01), Socha

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