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. 03, 1992
Filed:
Jun. 14, 1990
Ernst Wurl, Hottingen, DE;
Helmut Schreiner, Nuremberg, DE;
Mannesmann Aktiengesellschaft, Dusseldorf, DE;
Abstract
An injection molding machine for manufacturing plastic moldings contains a plurality of hydraulic loads for individual subassemblies including a closing unit, an injection unit, an ejector and cores. A plurality of the pumps are respectively connected to the hydraulic loads. At least one alternating-current servomotor is provided for driving the pumps. In a method of controlling hydraulic drives of the foregoing machine, the measured value of a subassembly is detected and compared with a desired value; any deviation detected thereby is converted into a desired velocity value. The speed of rotation of an associated motor is then adjusted, via a servodrive module, in response to the mentioned desired velocity value.