High speed automatic lathe

Claim 1

A chuck for high speed automatic lathe comprising a headstock frame, a spindle rotably mounted in said frame, a chuck sleeve slidably mounted in said spindle, a collet within said chuck sleeve for holding a work-piece, said collet being fixed to said spindle proximate one end thereof, biasing means urging said chuck sleeve in one axial direction, the direction being such as to cause said collet to close and remain in closed position, a motor rotor fixed to said spindle, a motor stator fixed to said frame bearings in said frame exterior to said motor and holding said spindle for rotation therein; a cylinder member having a head at one end thereof, a skirt fixed to said head end and attached to said spindle for rotation therewith, said skirt having an annular groove around the outer periphery thereof and having a conduit therein connecting said groove with the interior of said cylinder member, a piston member in said cylinder, said piston member being attached to said chuck sleeve for rotation therewith and fitting sealingly and slidably in an axial direction within said cylinder member, a source of pressurized fluid attached to said frame, and gasket means within said frame disposed proximate to said skirt on both sides of said groove for minimizing leakage of presurized fluid between said gasket and said skirt, said gasket being apertured and said source of pressurized fluid being so located in said frame that fluid can pass in either direction between said source and the interior of said cylinder member through said gasket aperture, said skirt groove and said skirt conduit.