Appeal No. 2000-1354 Page 6
Application No. 08/894,129
original shape and the punch 23d is withdrawn from
engaging the work piece 46. A punched piece 46a punched
from the work 46 drops through the hollow hole 30b of the
lower main shaft 30 to reach a transporting device 49,
such as a conveyor and is removed.
By repeating the foregoing operation, punching of
the work piece 46 can be sequentially carried out. When a
phase of a shaped die is to be changed, the upper and
lower main shafts 3 and 30 are driven to rotate in
synchronism with each other by the rotary driving power
source via the worms 9 and 36 and the worm wheels 8 and
34.
By this, punching by the shaped die with a change
phase can be done easily. Also, it becomes possible to
perform punching of complicated configurations by
sequential phase division.
Discussion will be given herebelow with respect to
exchanging of the upper and lower dies 23 and 45. At
first, the piston 3a in the cylinder 2 is positioned at a
substantially intermediate position in the cylinder 2 as
shown in FIG. 1. At this time, the arm of a
non-illustrated automatic exchanger device is moved
toward the upper die 23 and grips the annular groove 23c
of the die 23.
Once, the upper die 23 is gripped, the pusher 21 is
driven downwardly by the unclamping cylinder 20 to apply
pressure to the head 19a at the top end of the clamping
rod 19 to release the die clamping mechanism 22.
Then, while in this position, the upper die 23 can
be detached from the upper main shaft 3, as shown in FIG.
2.
When the detaching of the upper die 23 is completed,
the lower main shaft 30 is driven upwardly by the lift
cylinder 39. Thereafter, the clamp rod 47b is driven
downwardly by the clamping cylinder 47 of the die
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Last modified: November 3, 2007