Appeal No. 2000-1354 Page 5
Application No. 08/894,129
fixed to the lower end of the lower main shaft 30. A yoke 41
is engaged on the outer periphery of the ring 38. The yoke 41
is supported by a lift cylinder 39 for vertical movement along
a guide rod 40. Therefore, the lower main shaft 30 can be
driven vertically by the lift cylinder 39. A lower die
assembly 45 is mounted on the upper end of the lower main
shaft 30 and a die 45a is provided on the lower die assembly
45 for punching a work piece 46 between a punch 23d of the
upper die assembly 23.
Morita sets forth the operation of his punch press
(column 5, lines 1-68) as follows:
Next, the operation will be discussed with reference
to FIGS. 2 and 3. FIG. 1 shows the condition before
punching the work piece 46 between the punch 23d provided
in the upper die assembly 23 and the die 45a provided in
the lower die assembly 45. When the hydraulic pressure is
supplied to the upper pressure chamber 2 , the upper main
1
shaft 3 is lowered from the illustrated position so as to
initially bring the elastic stripper 24 onto the upper
surface of the work 26. Further downward movement of the
upper main shaft 3, compresses the elastic stripper 24
and the work 46 is punched between the punch 23d and the
die 45a.
Subsequently, by supplying hydraulic pressure to the
lower pressure chamber 2 , the upper main shaft 3 is
2
driven upwardly. Upon the upward movement of the upper
main shaft 3, the elastic stripper 24 returns to its
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Last modified: November 3, 2007