PROBLEM TO BE SOLVED: To provide a movement direction conversion mechanism which permits selection of rotation direction of a cam upon the switching of a channel using a stop cock and reliably performs rotation/stopping at every 90°.SOLUTION: An actuator includes: a pin 214 which performs linear motion along a groove 212 of a cam 206 to which a three-way stop cock 201 is connected the cam 206 which performs rotary motion and a control part which subjects the pin 214 to linear motion along the extension direction of the cam 206, causes the cam 206 to rotate around a center shaft 211 of the rotation and, thereby, switches a channel of the three-way stop cock 201. First, second, third and fourth grooves which form a groove 212 have such a shape as to be joined to one another, inclination directions of a first inclination angle and a third inclination angle are reverse with respect to the center shaft 211, and inclination directions of a second inclination angle and a fourth inclination angle are reverse with respect to the center shaft 211.COPYRIGHT: (C)2015,JPO&INPIT【課題】活栓を用いた流路の切り替えにおけるカムの回転方向の選択が可能であり、確実に90度毎に回転・停止を行う。【解決手段】三方活栓201が接続されるカム206の溝212に沿って直進運動するピン214と、回転運動を行うカム206と、ピン214をカム206の延在方向に沿って直進運動させ、かつカム206をその回転の中心軸211に対して回転させることで三方活栓201の流路を切り替える制御部とを有し、溝212を形成する第1、第2、第3および第4の溝は繋がった形状であり、第1の傾斜角度と第3の傾斜角度は傾斜の向きが中心軸211に対して逆であり、かつ第2の傾斜角度と第4の傾斜角度は傾斜の向きが中心軸211に対して逆であるアクチュエータ。【選択図】図3
