PURPOSE: To prevent a punch from entering into a previous hole-punching position by moving automatically a die at every stroke of a press, and to prolong the service life of a die, by providing the moving means of a die and its driving means to the inside of the processing die.

CONSTITUTION: After piercing a hole of prescribed shape in a liquid crystal panel by lowering a slide, and when the slide is raised to a dead point, a limit switch is actuated to rotate, by its signal, a motor 15 equipped with a timer fixed to a fixed plate. Then a rotary shaft 14 and bevel gears 13, 12 are rotated, and an eccentric pin 9 is rotated by succeedingly rotating worm 8a and worm gear 9a. Accordingly, a moving plate, into which the lower end part of the pin 9 is fitly inserted, is rotated. Thereafter, the rotation of the moving plate is stopped instantaneously with the stop of the motor 15. Directly after the stop, a piercing of the next hole can be performed because a plate made of polycarbonate resin fixed to the moving plate has already moved by a precribed angle from the previous piercing position.