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:
Mar. 11, 1980
Filed:
Aug. 09, 1977
Tsugio Udagawa, Tomobemachi, JP;
Takeshi Araya, Shimoinayoshi, JP;
Takashi Yoshida, Minorimachi, JP;
Hitachi, Ltd., both of, JP;
Hitachi Seiko, Ltd., both of, JP;
Abstract
A method and apparatus for automatic weld line tracing using a non-contact sensor for detection of a weld line, which sensor is continuously reciprocated across the groove. Signals produced from the sensor during the reciprocation are compared at the ends of the groove, and the lower voltage value of the two signals is determined. A value lower than the lower voltage of the two signals by .delta. is predetermined and the position associated with the value is detected by a displacement-measuring instrument, the output of which is utilized for control of the positions of a welding torch.