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:
Jul. 27, 1993
Filed:
Jun. 11, 1991
Utami Soma, Hachioji, JP;
Seitaro Kasahara, Hachioji, JP;
Konica Corporation, Tokyo, JP;
Abstract
An earth current leakage breaking circuit detects a current leakage in an AC line in a copying apparatus and breaks electrically the AC line. The circuit has a current difference detector which detects a difference in current between an incoming current and an outgoing current in AC lines which supply electric power from an AC power source to electrical loads in the apparatus. A control circuit which, when it detects an output signal from the current difference detector which continuously exceeds a reference level, turns off a relay provided to the AC lines. The control circuit has a timing generator which generates timings to start driving the loads, and a reference level generator which generates the reference level being variable in accordance with the generated timings.