Patent ID: 7404709

Claim:
An injection unit for rotating and axially moving an injection screw of an injection molding machine, comprising: a first member arranged linearly movable and having a front face closer to the injection screw and a rear face remote from the injection screw; a pulley shaft rotatably supported by said first member and having a pulley fixed thereon on a rear side of said first member; a rotation-transmitting member connected with said pulley shaft such that a relative axial displacement therebetween between is allowed, and connected with a rear end of the injection screw, for transmitting rotation of said pulley shaft to the injection screw; a load detection member mounted on the front face of said first member and having an inner annular portion supporting said rotation-transmitting member rotatably such that a relative axial displacement in between is inhibited, for measuring a resin pressure acting on the injection screw; a second member not integrally formed with said first member and attached to the rear face of said first member; a screw-rotation motor mounted on said second member for rotating the pulley fixed on said pulley shaft through a belt; and thrust force applying means for applying a thrust force to said second member so that the injection screw is axially moved.