PURPOSE: To easily convey a stock by providing a crank mechanism part for sliding sliding blocks for fixing a pair of plate dies freely slidably installed in a guide groove of a machine body in the opposite directions at the same speed and providing the plate dies face to face on the sliding blocks.

CONSTITUTION: The stock A is conveyed by a transfer machine 10 and inserted between the plate dies 8, 8' of a working machine for the 1st stage to fix the plate dies 8' 8'. Sliding blocks 7, 7' for fixing a pair of plate dies guided by a guide groove 1a of the machine body 1 are slided by a crank mechanism 2 having cams 2b, 2'b decentered 180° to the rear through a stroke-regulating mechanism 6 at the same speed to the opposite direction. Since the dies 8, 8' are fixed to the sliding block 7, 7', the dies move in the same way and the stock A undergoes plastic working at a fixed conveyed position. When the working has been completed, the stock A is pushed up by a lower knockout device 9 and conveyed by the transfer press machine 10 to the plate dies 8, 8' of the next state. By this method, the stock A can be worked at a fixed position and conveyed easily.