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:
Nov. 07, 2000
Filed:
Dec. 24, 1998
Nobuya Niizeki, Niigata, JP;
Motohiro Kobayashi, Niigata, JP;
Niigata Engineering Co., Ltd., Tokyo, JP;
Abstract
A drive control apparatus is provided for an electric injection molding machine, in which a screw is used to inject melted resin into a cavity of a metal mold. Herein, the screw is driven to move in a desired direction by using first and second servo motors, which are connected together using a belt, for example. In the drive control apparatus, a motion controller produces a drive control signal to control operation of the screw. A master servo amplifier inputs the drive control signal to control the first servo motor, wherein a position of a rotor of the first servo motor is detected and is used as a feedback value. The master servo amplifier further produces a torque instruction signal representing a ratio against rated output of the first servo motor by which the first servo motor is to be driven. For example, frequency of the torque instruction represents rotation speed of the motor, while amplitude represents magnitude of torque. A slave servo amplifier controls the second servo motor based on the torque instruction signal. The motion controller is capable of producing a synchronizing signal, which is delivered to the master and slave servo amplifiers so that the first and second servo motors are driven in a synchronized manner.