Patent ID: 7452198
Filing Date: 2008-11-18
Classification: B29C

Abstract:
1. A controller of an injection molding machine having a first motor for rotating a screw in a cylinder and a second motor for axially moving the screw in the cylinder, said controller comprising: means for driving the first motor to rotate the screw in a first direction to feed resin in front of the screw in the cylinder while driving the second motor for metering the resin until the screw is axially moved to a preset metering completion position; means for setting a distance of a retreating motion of the screw after the screw reaches the preset metering completion position, and first and second different speeds for the retreating motion of the screw; and means for driving the second motor to axially move the screw by the set distance so that the screw performs the retreating motion after the screw reaches the set metering completion position, and driving the first motor to rotate the screw in the retreating motion thereof in a second direction reverse to the first direction, wherein the second motor is driven so that the screw performs the retreating motion at the set first speed while the screw is not rotated and at the set second speed while the screw is rotated in the second direction.