Patent ID: 9254600
Filing Date: 2016-02-09
CPC Classification: B29C,B29K

Claim Text:
1. An injection foam molding machine comprising: a movable mold platen; a fixed mold platen; a mold fastening hydraulic cylinder that is provided at each of four corners of both mold platens; a tie bar that is driven by the hydraulic cylinder to fasten the molds; two sets of mold opening and closing actuators that drive the movable mold platen to move close to or away from the fixed mold platen; two sets of electrically driven core back devices, each of the electrically driven core back device including a motor, a speed reducer coupled to the motor, a ball screw shaft of which one end is coupled to an output shaft of the speed reducer and the other end is a free end, and a nut screwed onto the ball screw shaft; a control device that controls the mold opening and closing actuators and the electrically driven core back devices; and a contact support which is disposed so that an end surface of the contact support faces to an end surface in an axial direction of the nut and which has the hollow portion along the axial direction into which the other end of the ball screw shaft is capable of being inserted, wherein the nut is capable of moving close to or away from the end surface of the contact support by drive of the electrically driven core back device, the control device moves the movable mold platen away from the fixed mold platen by using the two sets of the mold opening and closing actuators and by using the two sets of electrically driven core back devices so as to move the nut to push the end surface of the contact support during a foaming core back operation, and the two sets of electrically driven core back devices are installed as follows;