The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 17, 1990
Filed:
Dec. 21, 1988
Applicant:
Inventor:
Hirosumi Itoh, Nagoya, JP;
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
D05B / ; D05B / ; D05B / ; G01J / ;
U.S. Cl.
CPC ...
11212111 ; 112314 ; 112320 ; 250205 ;
Abstract
A device for performing an initial setting of a photosensor of a sewing machine including a light-emitting element and a light-receiving element. The device adjusts the strength of light emitted by the light-emitting element so that the output of the light-receiving element responding to the emitted light falls within a preset normal range. Thus the output from the light-receiving element is normalized and the photo-sensor can correctly discriminate various levels of reflectance, i.e., between a pattern signal and a cloth-edge signal, or among pattern signals of various brightnesses.