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:
Feb. 02, 2010
Filed:
Dec. 14, 2007
Junpei Maruyama, Yamanashi, JP;
Satoshi Takatsugi, Yamanashi, JP;
Junpei Maruyama, Yamanashi, JP;
Satoshi Takatsugi, Yamanashi, JP;
Fanuc Ltd., Yamanasahi, JP;
Abstract
While a check ring of a screw of an injection molding machine is in open state, an absolute value (|Δ resin pressure/Δ rotation amount|) of a variation of a resin pressure per unit variation of the screw reverse rotation becomes greater than a predetermined reference value. However, after the check ring is closed, |Δ resin pressure/Δ rotation amount| becomes equal to or less than the reference value. From this, detecting if the |Δ resin pressure/Δ rotation amount| during reverse rotation of the screw, it is possible to determine that the check ring is closed or not. As a result, it is possible to obtain a screw reverse rotation amount which is optimal for reliably closing the check ring.