To prevent the position slippage of a work sending position by providing a roller shaft fixed to an arm, contacting to a plate for arm transfer locus guide through a roller, and engaged to the long hole of a pinion plate through a different roller.

The thrust of in air cylinder 24 is converted to the rotating operation of a pinion plate 20 through a rack 21, and the pinion plate 20 is rotated in the direction A by making a shaft 17 as the center. When the pinion plate 20 is rotated in the direction A, its torque is transmitted to a bearing 27 through a bearing 30 slide contacted to a slotted hole, a roller shaft 29, an arm 11, and a roller shaft 28. Consequently, the arm 11 is rotated and moved up and down along a guide plate 26.