| 摘要 |
PROBLEM TO BE SOLVED: To prolong the service life by preventing the early damage to a ball screw used for an injection driving system of an electric injection molding machine. SOLUTION: This ball screw is provided with a tapered part 1 cutting a nut groove part just before entering from a load range into the return tube and a nut groove just before entering from the return tube to the load range in such a state as gradually enlarging the groove parts toward the return tube side.
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