Title: Sewing machine with edge guide

Abstract: A sewing machine having an edge guide for producing a stitched seam along an edge of a workpiece terminating at another edge forming an angle with the first has an optical device for directing a pencil or beam of light toward a reflective surface which underlies the workpiece and is covered thereby until the movement of the workpiece exposes the reflective surface at this other edge. The optical detector then produces a signal for initiating a control function, e.g. the change of stitch pattern to tie off the end of the previously sewn seam or to lodge the needle in the fabric so that the workpiece may be turned to bring the other edge into contact with the edge guide. The control system can include a programmer for the successive stitching operations which are initiated in succession in response to the optical sensor.

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Other info:

Inventors: Pollmeier, Konrad (Bielefeld, DE, US)
Thesing, Wilhelm (Haibach, DE, US)

Application Number: 884807
Filing Date: 1978-03-09
Publication_date: 1980-10-07
Assignee: Durkoppwerke GmbH (Bielefeld, DE)
Primary Class(es): 112/470.02 112/153, 112/308
Other Classes:
US Patent Ref:

2781008	Feb, 1957	Nielsen	112/235.
3182619	May, 1965	Sally	112/153.
3370559	Feb, 1968	Longcore	112/235.
3613608	Oct, 1971	Hinerfeld	112/121.
3970014	Jul, 1976	Chano et al.	112/121.
3972598	Aug, 1976	Kunz	350/299.
4092937	Jun, 1978	Landa, Jr. et al.	112/121.

Other Refs:
Primary Examiner: Nerbun, Peter P.
Assistant Examiner:
Attorney: Ross; Karl F.