Sewing – Elements – Starting or stopping
Patent
1984-11-20
1986-05-13
Nerbun, Peter
Sewing
Elements
Starting or stopping
1122621, 11212111, 112316, D05B 6922, D05B 6918, D05B 2722
Patent
active
045879150
ABSTRACT:
A method for approaching a predeterminable end point of a seam spaced from the edge of a workpiece, with a sewing machine which comprises an adjustable needle and lower transport, a sensor arranged before the needle and triggering the process for the positioning of the needle in the end point during passage through the edge, a pulse generator coupled with the main shaft of the sewing machine for the delivery of counting pulses for a pulse counter, and a micro-computer which controls the action of the feed means as a function of the pulses originating from the sensor and from the pulse generator. To execute a desired shortening of the length of one or more of the last stitches before the end point of a seam, the workpiece is moved back by the difference between the desired stitch length and the stitch length set by the setting device, before execution of the adjusted feed. For correction of the stitch length executed during the feed phase, the cloth feeder is connected with a switching gear controlled by the micro-computer for controlled switching on during its reversed feed phase which precedes the respective forward feed phase.
REFERENCES:
patent: 4404919 (1983-09-01), Martell et al.
patent: 4491080 (1985-01-01), Hager
patent: 4495877 (1985-01-01), Willenbacher
patent: 4526114 (1985-07-01), Martell et al.
patent: 4528923 (1985-07-01), Hager
Schneider Franz
Wenz Herbert
Nerbun Peter
Pfaff Industriemaschinen GmbH
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