Apparatus for detecting the end of cloth-overlap on a sewing mac

Details Apparatus for detecting the end of cloth-overlap on a sewing mac Apparatus for detecting the end of cloth-overlap on a sewing mac

1989-06-23

1990-11-06

Nerbun, Peter

Sewing

Elements

Starting or stopping

112277, 250205, D05B 6918, G01J 128

Patent

active

049676768

ABSTRACT:
An apparatus for detecting a stepped portion between an upper cloth and a lower cloth on which the upper cloth is mounted, including a light-emitter for transmitting light to a light receiver. The stepped portion is detected based on a decrease in light received by the light receiver. In order to assure detection of the stepped portion, an optimum amount of light to be emitted from the light-emitter is determined so that a deviation between a transmissivity of the lower cloth and a transmissivity of both cloths arranged in a layered configuration may be maximized.

REFERENCES:
patent: 4696246 (1987-09-01), Rohr et al.
patent: 4732095 (1988-03-01), Saito et al.
patent: 4745272 (1988-05-01), Andreatti, Jr.

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