| 摘要 |
PROBLEM TO BE SOLVED: To prevent the skip of teeth of a timing belt. SOLUTION: A screw is moved forward together with ball nuts and a pusher plate by using servo motors and rotating a timing pulley 22 clockwise and rotating a ball screw shaft together with timing pulleys 18, 18 to inject molten resin in a heating cylinder into a molding cavity. At that time, tension force is applied to a timing belt 23 between the timing pulley 22 and a timing pulley 18 of smaller winding angleαof the timing belt 23 to press the timing belt 23 to the timing pulley 18 and prevent the generation of the phenomenon of skip of teeth on the transmission timing pulley 18 of smaller winding angleα.
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