PURPOSE: To make it possible to change a conveyance-direction stroke without exchanging cams, and to perform conveyance positioning at a high speed and with high precision.

CONSTITUTION: An oscillating lever 8 is linked to a roller gear cam 6 put on and fixed to an input shaft 4, and oscillating lever 20 is linked to a roller gear can 7 by hooking. A vertically moving board 14 to be moved upwards and downwards by the oscillating lever 8 is provided with an output arm 18 movable in line right and left directions. In a guide block 19 to be fixed to the output arm 18, a guide groove 19a is formed. The oscillating lever 20 is provided with a supporting bar 24 having a connecting part 25 movable in the radial direction. A first roller fixed to the connecting part 25 is linked to the guide groove 19a. In a front-side housing a vertically adjusting board 31 is supported movably in the vertical directions, and to the guide groove 38a of a guide block 38 to be fixed to the vertically adjusting board 31 a second roller 27 fixed to the connecting part 25 is linked.