PURPOSE: To reduce drive torque of a device in a manner wherein pressing force of a cam follower is prevented from acting as a load on rotating a cam.
CONSTITUTION: A cam mechanism 13 of lifting a lift unit by a prescribed stroke is constituted of arm-shaped cam followers 34, 35 pivotally mounted with a point end part in the lift unit and plate cams 32, 33 having cam contour surfaces 51, 52 brought into contact with between both ends of the cam followers 34, 35. Recessed parts 53, 54 are provided in one side surface of the cams 32, 33. Guide surfaces 55, 56 extended along the cam contour surfaces 51, 52, are provided in an inner facing peripheral surface of the recessed parts 53, 54. A dynamic roller 67 is brought into contact with the guide surfaces 55, 56. The cam followers 34, 35 and the dynamic roller 67 are energized in a direction of approaching each other by an elastic means.
IWANO FUMIYUKI
UEDA MICHIO
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