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. 22, 2008
Filed:
Dec. 20, 2005
Yasuyuki Kohno, Sagamihara, JP;
Minoru Somukawa, Sagamihara, JP;
Yasuyuki Kohno, Sagamihara, JP;
Minoru Somukawa, Sagamihara, JP;
Aida Engineering, Ltd., Sagamihara-Shi, Kanagawa, JP;
Abstract
A slide of a press machine is driven by composite thrust of thrust of an electric (servo) motor SM (via a screw/nut mechanism from the electric motor) and thrust of hydraulic cylinders SYL, SYLto which pressure oil is supplied from a constant, high pressure source. A slide control device controls the electric motor SM and the hydraulic cylinders SYL, SYL, based on a slide position signal and a motor angular velocity signal, and at the same time, makes the hydraulic cylinder SYLwork as a pump during a period when slide load is small, charging pressure oil to the constant, high pressure source by using the thrust transferred from the electric motor to the hydraulic cylinder SYLthrough the screw/nut mechanism and the slide.