Injection device for synthetic resin injection molding

Claim 1

In an injection molding machine for a synthetic resin including a mold clamping device, an oil pump all mounted upon a stationary bed, and an injection cylinder with a ram and a screw in a heating cylinder all horizontally disposed said injection device being reciprocably mounted upon said stationary bed, the improvement comprising: A. a block slidably mounted on said bed and movable reciprocably in a horizontal plane toward and away from said mold clamping device said block further including a horizontal and planar upper surface; B. said injection device further including a horizontal and planar lower surface removably coupled to said planar upper surface of said block and thereby integrally horizontally movable therewith, said injection device further including an oil motor coupled through said ram to said screw in said heating cylinder; C. a cylinder and piston for reciprocating said injection device to obtain a nozzle-touch of said injection device wherein; D. said block includes a cavity therein defining said cylinder, said piston being mounted and operatively contained in said cylinder, a piston rod connected to said piston extending out of said block and being fixedly attached to said bed and fixedly positioning said piston with respect to said bed, said block containing said cylinder being horizontally movable with respect to said fixed piston mounted therewithin; E. said reciprocal block further comprising therein a plurality of hydraulic circuits, including circuits for controlling said ram in said injection cylinder and said oil motor of said injection device, and a nozzle-touch control circuit opening into spaced positions in said cylinder on opposite sides of said piston operable for controlling said horizontal reciprocating movement of said block with respect to said piston and; F. a plurality of control valve means respectively in said plurality of hydraulic circuits; G. wherein all of said hydraulic control circuits and said valve means are incorporated and consolidated into said block with said ram communicating therewith by passages including ports through said horizontal upper surface of said block; and H. said hydraulic circuits fluid pressure supply is by a single main pressurized fluid inlet on said block which is connected to said oil pump through a flexible pipe.