| 摘要 |
PURPOSE:To feed a new part of a grinding member so as to use the substantially whole parts of the grinding member by slidably inserting an operation rod of a ball, which engages/releases an arm and/from a shaft by projecting/ retracting the ball to/from a recessed groove in the shaft, into a vertical hole of the shaft CONSTITUTION:An arm 7 oscillated by the output from a motor 5 is connected to a shaft 2 holding a grinding member 1 via a boss part 7b. A vertical hole 15 is arranged in the shaft 2, and plural through holes 16 radially extending from the inside of the vertical hole 15 toward the inner circumferential wall of the boss part, 7b are arranged. Inside each of the through holes 16, a ball 17 is inserted so as to be advanced/retracted to/from plural recessed grooves 18 to be engaged with the ball 17 in the boss part 7b, and an operation rod 19 of the ball 17 engaging/releasing the arm 7 and the shaft 2 with/from each other is slidably inserted in the vertical hole 15 of the shaft 2. In this way, a new part, of the grinding member 1 is fed forward for the use only by the sliding operation of the operation rod 19 and the rotating action of the grinding member 1. |
