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. 23, 1993
Filed:
Mar. 05, 1991
Seiichi Yoshikawa, Higashiosaka, JP;
Minoru Yamada, Osaka, JP;
Shuichi Nakagawa, Suita, JP;
Kazuo Kobayashi, Katano, JP;
Yoshikawa Iron Works Ltd., Osaka, JP;
Abstract
A rivetting machine has a hydraulic cylinder connected with a hydraulic power source, the cylinder including a piston shaft, a motor-driven spindle extending through and journaled to the piston shaft, and a rivet head forming tool secured to the bottom end of the spindle and carrying a forming shaft. A controller of the machine has a linear encoder for detecting the axial position of the piston shaft, an electric hydraulic servo valve provided in a hydraulic circuit between the hydraulic power source and the hydraulic cylinder, a machining data input unit for inputting machining data of the work rivet into a programmable control unit. The control unit receives the output of the linear encoder and the input machining data and controlling the hydraulic cylinder via the electric/hydraulic servo valve based on the machining data and the output of the encoder.