Patent ID: 7125232
Filing Date: 2006-10-24
Classification: B29C

Abstract:
1. A controller of an injection molding machine for controlling a back pressure and retreating a screw or a plunger up to a set metering completion position while rotating the screw at a set rotational speed, comprising: means for advancing or retreating the screw or plunger; means for rotating the screw; means for detecting the position of the screw or plunger; means for detecting a resin pressure; back pressure feedback control means for controlling the means for advancing or retreating the screw or plunger so that a detected resin pressure coincides with a set resin pressure; means for stopping the back pressure feedback control by the back pressure feedback control means when the screw or plunger reaches a set change point before the screw or plunger reaches a metering completion position and moving the screw or plunger up to the metering completion position; and means for reversing the screw when the screw or plunger reaches the set change point.