Material thickness sensing device for sewing machines

Details Material thickness sensing device for sewing machines Material thickness sensing device for sewing machines

1986-07-21

1987-08-18

Schroeder, Werner H.

Sewing

Stitch forming

Feeding work material

112320, 324229, D05B 2902, D05B 2912, D05B 2724

Patent

active

046869174

ABSTRACT:
A sewing machine with a sensing device positioned ahead of a stitch-forming point, senses changes in the thickness of a material being fed by the sewing machine. In order to determine the difference in thickness, the sensing device has a pickup foot capable of vertical movement with a sensing surface that lies on the material adjacent the point the stitch is formed. A sensing lever is movably mounted on the pick-up foot with a sensing arm that lies on the material ahead of the sensing surface, a measuring member detects the relative movement between the pickup foot and the sensing lever.

REFERENCES:
patent: 3665743 (1972-05-01), Frohling
patent: 4038931 (1977-08-01), Kosrow et al.
patent: 4363281 (1982-12-01), Reinke
patent: 4574719 (1986-03-01), Balke

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