PURPOSE: To enhance the accuracy of hole positions by moving a punch-pin supporting block using a movement means, controlling this movement using a control means, and varying the punching intervals of the punch pins relatively.
CONSTITUTION: In a boring device, a frame with a green sheet affixed thereto is held in position by a green sheet frame holding jig 16. A die set 14 holding the green sheet on the holding jig 16 can move back and forth in Z direction, and an X-direction stage 10, a Y-direction stage 11 and a θ-direction turning stage 15 are moved by a command signal of a function generator 13 and have their feed rates controlled. Thus holes are bored in a certain pattern in the green sheet. A plurality of punch pins 21 are mounted on the upper die 22a of the die set 14. The upper die 22a is opposite to a lower die 22b with a predetermined interval between, and the plurality of punch pins 21 are put into reciprocating motion either simultaneously or selectively by control of a solenoid 20, so that holes are bored in the green sheet stretched between the upper and lower dies 22a, 22b.
TAKASAKI MITSUHIRO
IWAMURA RYOJI
MURAYAMA NOBUYASU
TAKAHASHI KAZUTOSHI
SENGOKU NORIO
OKADA KENICHI
