| 摘要 |
PROBLEM TO BE SOLVED: To prevent the breakage of a pressure plate or the like due to a moment load to a screw shaft or the like by arranging an injection motor for transmitting rotation within a heating cylinder to advance/retreat freely a screw shaft, and a transmission shaft for converting rotational movement to linear movement and having a limited advance/retraction amount in the axial direction on the same shaft. SOLUTION: A gear 23 meshed with an annular gear 25 via an intermediate gear 24 is secured to the output shaft 8a of a measuring motor 8, and the annular gear 25 is secured to the outer circumference of the intermediate shaft 18. A hollow 38 is formed of a hollow shaft 18, a bearing holder 17, a pressure plate 1 and bracket 13, and a motor flange 14. The injection motor 9 is provided with a rotor of a hollow rotor shaft 26 fitted and secured therein, and an annular retraction limitation stopper 32 forming an advance/retraction quantity limitation device is provided at the front part of a spline shaft 31, and an extendible quantity limitation device 33 is provided at the rear part thereof. Thus a distance from the spline axial core to the stopper is made short a moment load is prevented from generating on the screw shaft and ball screw shaft, and the breakage of relative members can be prevented.
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