ROTARY SHAFT SUPPORTING DEVICE

PROBLEM TO BE SOLVED: To improve the positional accuracy of one rotating member by reducing the backlash of a rotary shaft supporting device supporting the shaft of one rotating member which is pressed by the other rotating member. SOLUTION: This device is provided with a second rotating member 62 pressed by a first rotating member 61, a pair of inside bearings 63 rotatably supporting the respective both end parts of the shaft 58 of the member 62, a pair of outside bearings 64 attached to the outside of the respective bearings 63, and rotatable supporting the both end parts of the shaft 58 of the member 62, a sliding surface 63b formed on the outside surface of one bearing 63 of the bearings 63 and 64 supporting the member 62, a pair of guides 68 which is supported so that it can slide to the member 61 and can not rotate, and a pressing member 69a making elastic force for pressing the surface 63b to the guide 68, and to the member 61 act on one bearing.