Patent ID: 7165966
Filing Date: 2007-01-23
Classification: B29C,Y10T

Abstract:
1. An injection molding machine, comprising: a heating barrel for melting and kneading a resin fed from a hopper, said barrel having an injection nozzle at its front end; a screw movably and rotatably inserted in the heating barrel; a screw drive shaft coupled at its one end to the rear end of the screw; charging means including a charging motor for rotationally driving the screw drive shaft to rotate the screw so as to melt the resin in the heating barrel while feeding the molten resin forward of the screw, and charging the molten resin in front of the screw, and torque transmission means for transmitting the driving torque of the charging motor to the screw drive shaft and permitting a displacement of the screw drive shaft in the axial direction; a body frame fixing and supporting the charging motor and the torque transmission means, said frame including a front plate fixing and supporting the base of the heating barrel; injection drive means including a linear-movement shaft for transmitting an injection force to the screw drive shaft and movable in the axial direction, and an injection motor for advancing the linear-movement shaft and producing the injection force for injecting the molten resin in the heating barrel; shaft coupling means having a bearing to support rotatably for coupling the rear end of the screw drive shaft to the front end of the linear-movement shaft such that only a thrust in the axial direction is transmitted to the screw drive shaft; and a pair of linear guides for supporting both lateral sides of the shaft coupling means so that the shaft coupling means is allowed to move in the axial direction, said linear guides are positioned generally at the same height as the central axis of the screw drive shaft.