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. 12, 2001
Filed:
Jun. 18, 1999
Akira Ito, Chiba, JP;
Sumitomo Heavy Industries, Ltd., Tokyo, JP;
Abstract
A motor-driven injection molding machine includes an injection device driven by a servo motor, and a load cell for detecting a pressure of a molten resin stored in front of a screw. A position detector detects a position of a screw, and a controller controls the servo motor in accordance with detected values obtained by the load cell and the position detector. The controller controls, in response to a command to adjust a zero point for the load cell, the servo motor to advance and retract the screw in an advancing movement and a retracting movement a plurality of times in a back and forth movement, and calculates an average value of a corresponding plurality of detected values obtained by the load cell during the back and forth movement of the screw to adjust the zero point for the load cell.