| 摘要 |
<P>PROBLEM TO BE SOLVED: To save oil by smoothly opening and closing a valve orifice 25 of an oil supply pipe 24 by a simple opening/closing structure to automate the supply of the oil. <P>SOLUTION: An oil supply pipe 24, a valve element 26 and a center pin 21 are arranged on a rotational center line 4a with respect to an inner pipe 10 of a holder 4, and the inner pipe 10, the center pin 21 and the valve element 26 can be reciprocally moved in the direction of the rotary center line 4a with respect to the oil supply pipe 24. At an approach movement position P where a cutter mounting part 11 approaches the oil supply pipe 24, a shaft 27 of the valve element 26 is supported to a pressure reception part 14 of the inner pipe 10 of the holder 4 by an elastic force by a compression coil spring 29, and an opening/closing part 28 of the valve element 26 closes the valve orifice 25 of the oil supply pipe 24. In a separation movement position where the cutter mounting part 11 separates from the oil supply pipe 24, the shaft 27 of the valve element 26 is supported to the upper end 21a of the center pin 21 by the elastic force by the compression coil spring 29 instead of the support by the pressure reception part 14 of the inner pipe 10, and the opening/closing part 28 of the valve element 26 opens the valve orifice 25 of the oil supply pipe 24. <P>COPYRIGHT: (C)2013,JPO&INPIT |
