Gear cutting – milling – or planing – Milling – Cutter spindle or spindle support
Patent
1990-02-16
1992-01-07
Briggs, William
Gear cutting, milling, or planing
Milling
Cutter spindle or spindle support
384107, 408239R, B23Q 312
Patent
active
050785583
ABSTRACT:
A spindle and Z-axis unit comprises a spindle housing and a hollow rotor shaft rotatable and axially movable with respect to the spindle housing. The rotor shaft carries a collet at its lower end for chucking a machine tool such as a drill bit. The tool is changed in the collet by pneumatic actuation of a diaphragm which actuates a push rod within the rotor shaft to move the collect axially against a spring bias to clamp and unclamp the tool. The shaft is moved in the Z-direction along with a thrust bearing assembly by a screw nut which actuates a road to move the rotor shaft in the Z-direction to drill a workpiece after a pressure foot has first been moved to clamp the workpiece with respect to the spindle. Thus, the moving weight or mass previously attributable to parts such as a spindle saddle and spindle housing can be eliminated without impairing the reliability and chucking force of the collet mechanism.
REFERENCES:
patent: 4640653 (1987-02-01), Schartzman
patent: 4682920 (1987-07-01), Rodgers
patent: 4708547 (1987-11-01), Baron
patent: 4790700 (1988-12-01), Schwartzman
patent: 4828403 (1989-05-01), Schwartzman
patent: 4836692 (1989-06-01), Hagen
patent: 4869626 (1989-09-01), Kosmowski
Arai Kunio
Kanaya Yasuhiko
Briggs William
Hitachi Seiko Ltd.
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