| 摘要 |
PROBLEM TO BE SOLVED: To enable mode switching in the case of that using an oil unit. SOLUTION: A change ring 20 to be loosely fitted to a spindle 16 is connected to the spindle 16 so that only the rotation is made integrally by fitting a pin 19 penetrating the spindle 16 orthogonally into a slit 21. A plurality of cam teeth 22, 22... and cam teeth 23, 23... are oppositely protruded from a rear surface of the ring 20 and a front surface of an oil unit 15. The cam teeth 22, 23 mesh only at the retreating position of the ring 20 and the unit 15 is made connectable integrally with the spindle 16 in the rotational direction through the ring 20 and the pin 19.
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