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:
Dec. 17, 2002
Filed:
Aug. 31, 1999
Atsushi Ishikawa, Chiba, JP;
Sumitomo Heavy Industries, Ltd., Tokyo, JP;
Abstract
A movable mold is disposed so as to face the stationary mold and to be advanceable and retractable. The movable mold forms a cavity in cooperation with the stationary mold when mold clamping is performed. A sprue is disposed to face the cavity and has a concave portion formed at a front end thereof. A cut punch is reciprocatively disposed to face the cavity at a position corresponding to the concave portion. The cut punch enters the concave portion when advanced. A drive section is provided to advance and retract the cut punch when driven. A controller drives the drive section such that during the mold clamping, the cut punch is advanced at a predetermined extension force in order to perform gate cutting and such that the extension force is made no greater than a preset value before the mold is opened.