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:
Jun. 30, 1987
Filed:
Aug. 09, 1985
Hiromi Tajiri, Hyogo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A seam welding machine capable of producing a uniform welding bead quality along the seam of cylindrical articles to be welded such as cans and the like. Commercial AC power is full-wave rectified and then passed through an inverter to produce a relatively high-frequency AC output current. The AC output current is applied through a center-tapped secondary transformer to a rectifier circuit, and thence through a smoothing circuit composed of a reactor and a capacitor to a pair of rotary electrodes. A detector senses when end portions of article to be welded are near the electrodes, and controls the AC power source so as to reduce the welding current at the times when the end portions of the articles to be welded are passing the rotary electrodes.