Spindle mechanism
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United States of America Patent
Stats
-
Jul 27, 2004
Grant Date -
Jul 31, 2003
app pub date -
Dec 17, 2002
filing date -
Apr 18, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In order to achieve the lightweight, low-cost and high-efficiency design of a spindle apparatus, speed-change device 50 is provided such that slots 31 are formed in one of a spindle 10 and a cam shaft 12 while spiral torque cam grooves are formed in another, and extend around the axis thereof. A torque cam pin 34 is engaged in each slot and its associated torque cam groove, and the position of the spindle 10 relative to the cam shaft 12 in a circumferential direction can be changed by moving the torque cam pins 34 in the axial direction by drive device 43. Drawing tools 8 are moved in opening and closing directions by changing the position of the spindle 10 relative to the cam shaft 12 in the circumferential direction.
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Cited Art Landscape
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