Sewing – Stitch forming – Feeding work material
Patent
1985-09-24
1986-05-20
Hunter, H. Hampton
Sewing
Stitch forming
Feeding work material
112272, 112275, 112153, 112315, D05B 2708, D05B 3510
Patent
active
045893632
ABSTRACT:
A sewing machine for automatically making edge-parallel seams comprises a scanning device for recognizing the geometric form of the workpiece edge and a pressure piston lowerable laterally of the stitch formation point. For straight workpiece edges extending at an angle to each other, the pressure piston, having been lowered onto the workpiece with the sewing machine stopped, is rotated around the needle which is inserted in the workpiece, the workpiece being taken along accordingly. For a convexly arcuate edge pattern, first the lateral distance of the pressure piston from the needle is readjusted in such a way that it corresponds to the radius of the edge arc (e.g. scallop). Thereafter, with the sewing machine continuing to run, the pressure piston is lowered, whereupon the feed dog of the sewing machine rotates the workpiece around the pressure piston.
REFERENCES:
patent: 3139051 (1964-06-01), Story
patent: 3425369 (1969-02-01), Kosrow
patent: 4312286 (1982-01-01), Biotteau
patent: 4491080 (1985-01-01), Hager
patent: 4495877 (1985-01-01), Willenbacher
patent: 4526117 (1985-07-01), Willenbacher
patent: 4528923 (1985-07-01), Hager
Jehle Fritz
Willenbacher Erich
Hunter H. Hampton
Pfaff Industriemaschinen GmbH
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