| 摘要 |
A dispenser has a seal disk ( 30 ), a valve member ( 40 ), a plunger guide block ( 50 ), a motor ( 3 ), which rotates a cam-follower guide block ( 60 ), and an end cam ( 5 ). The seal disk ( 30 ) has communication holes ( 31 ), ( 32 ) and a sliding surface ( 33 ). The valve member has a sliding surface ( 41 ), three plunger holes ( 42 ) and three plungers ( 80 ) inserted in the plunger holes. The cam-follower guide block ( 60 ) has three guide holes ( 62 ) that receive cam followers, which each have a body ( 70 ) with a ball ( 75 ) within a recess ( 71 ). The ball ( 75 ) contacts the cam surface ( 5 A) of the cam ( 5 ) which causes the cam followers and plungers ( 80 ) to move back and forth parallel to the dispenser axis. The coefficient of friction between the ball and the recess is less than that between the ball and the cam surface ( 5 A).
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