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US 4,226,197 AGranted
Sewing machine with edge guide
AssigneeDurkoppwerke GmbH
InventorsKonrad Pollmeier, Wilhelm Thesing
Life of this patent
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AssigneeDurkoppwerke GmbH
InventorsKonrad Pollmeier, Wilhelm Thesing
Estimating the term…
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.
A sewing machine for the edge-parallel stitching of a workpiece having a pair of angularly adjoining edges, said sewing machine comprising:
A sewing machine for at least semi-automatically stitching a workpiece, comprising:
Dependencies are inferred from the claim text.