Appeal No. 1998-2064
Application 08/710,551
Appellant’s invention pertains to a rotary driving device
for a press machine. With reference to appellant’s Figure 2,
a tap T for tapping a hole in a workpiece W is provided at a
lower end of a rotary driving device 1. In operation, a
striker S of a turret punch press strikes a push head member
21 provided at an upper end of the driving device. Through a
series of elements provided within the driving device,
downward movement of striker S is converted into downward and
rotary movement of the tap T. The elements within the driving
device that accomplish this conversion include a male thread
axle member 29 having male threads, and a cooperating female
thread member 33 having female threads. When the striker S
strikes the push head member 21, the male thread axle member
29, which is rotatably mounted within the push head member, is
driven downwardly relative to the female thread member, which
is held against rotation within the driving device. As a
result, the male thread axle member rotates as it moves
downward.
Appellant’s inventive efforts include the provision of a
sliding connection 35, 37 between the female thread member 33
2
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