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:
Oct. 06, 1992
Filed:
Apr. 29, 1991
Applicant:
Inventors:
Hideo Naito, Hino, JP;
Masao Kamiguchi, Oshino, JP;
Assignee:
Fanuc Ltd., Minamitsuru, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B29C / ;
U.S. Cl.
CPC ...
425136 ; 425145 ; 425170 ; 425562 ; 425563 ;
Abstract
An injection apparatus of an injection-molding machine is described, including a servomotor for screw rotation including a pulse coder, the motor being driven in accordance with the difference between a command output from a control section of the injection-molding machine and an output from the pulse coder, thereby rotating a screw. During injection and pressure hold processes in which the motor is rendered nonoperative, the screw rotates as molten resin flows backward, if a check valve attached to the screw does not function normally, and this situation is detected as an abnormality of the check valve by a control section.