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:
Dec. 30, 1980
Filed:
Jun. 22, 1978
Hitachi, Ltd., both of, JP;
Hitachi Seiko Ltd., both of, JP;
Abstract
An automatic welding line tracing method and apparatus for causing a welding torch to follow the welding line by using a single non-contact-type sensor for detecting the welding line which is continuously reciprocated to traverse the groove of two pieces to be welded. During the reciprocating motion of the sensor, the sensor generates output voltages E.sub.1 and E.sub.2 respectively obtained by detecting the both ends of the groove to obtain E.sub.1 -.delta. and E.sub.2 -.delta. on the basis of the detected voltages E.sub.1, E.sub.2 and a separately established reference voltage .delta., and an output voltage P.sub.S corresponding to the central position of the groove is obtained from E.sub.1 -.delta. and E.sub.2 -.delta. to thereby compare the voltage P.sub.S with a voltage indicative of the central position of the oscillating motion of the sensor to thereby cause the welding torch to follow the welding line in accordance with the difference between these two voltages.