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. 28, 2012
Filed:
Oct. 16, 2008
Markus Notz, Schwändi, CH;
Markus Notz, Schwändi, CH;
Netstal Maschinen AG, Naefels, CH;
Abstract
The invention relates to a method and device for controlling a linear motion axis, particularly of the injection screw () or a melt piston for an injection molding machine. Said device comprises a hydraulically driven piston () having a piston chamber (A) and a rod chamber (B). According to the solution proposed by the invention, at least one process phase is controlled/regulated by means of two parallel proportional valves, an injection valve () and a metering valve (). The two proportional valves can be connected in parallel or in combination. The control/regulation of the driven piston () preferably uses digital technology. An enormous reduction in energy consumption and smooth transitions between the process phases are achieved with a hydraulic linear drive.