| 摘要 |
PROBLEM TO BE SOLVED: To prevent the contact of a screw with a heating cylinder. SOLUTION: When an injection motor is operated to rotate a ball screw shaft, a pusher plate 4 is guided according to the rotary direction of the ball screw shaft by a guide device 28. The guide device 28 is a linear guide extremely low in moving resistance and, since the linear guide 28 is not bent by the weight of the pressure plate 4 provided to a base part 3a high in rigidity, the pusher plate 4 is moved in a predetermined posture and a screw 2 is always moved in parallel to a heating cylinder 1. Therefore, trouble such that the screw 2 comes into contact with the inner surface of the heating cylinder 1 to be abraded and a resin is carbonized by the friction heat at the time of contact of the screw with the heating cylinder 1 is prevented.
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