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AssigneesCrankshaft Machine Company, C. M. Systems, Incorporated
InventorsAllan J. Heffron, Leverne H. Kennedy
Estimating the term…
Headstock and tailstock chucking apparatus for crankshaft machine tools, such as lathes and grinders, utilizing a centering hole defined in the crankshaft workpiece end for axially locating the workpiece relative to the machine, and the machining tools. The stock spindle chucks utilize a center engaging a previously located and dimensioned workpiece center to axially position the workpiece, which is biased into firm engagement with the center prior to chucking. The chuck center and workpiece is axially located and spindle motors reciprocate chuck actuating mechanism sequentially producing axial locking and radial chucking of the workpiece. Further, automatic limit switch positioning apparatus is employed to automatically position machine limit switch controls in accordance with workpiece dimensions and quill location.
Crankshaft positioning and chucking apparatus for crankshaft machines having a headstock and a tailstock for use with crankshafts having a centering hole defined in an end thereof axially related in a predetermined manner to crankshaft bearing surfaces to be machined comprising, in combination, a frame, a headstock spindle and a tailstock spindle rotatably mounted upon said frame in spaced opposed, coaxial relationship, a first chuck mounted upon said headstock spindle, a second chuck mounted upon said tailstock spindle a center located in one of said chucks for receiving a crankshaft centering hole for axially positioning a crankshaft received within said one chuck, center support means movably mounted within said one chuck for axial adjustment toward and away from the other chuck between a loading and unloading position and a machining position fixedly supporting said center, positioning means axially fixedly positioning said center support means at said machining position, crankshaft biasing means located in said other chuck biasing a crankshaft received therein toward said center, crankshaft holding means defined on each of said chucks, and actuating means associated with each spindle operatively connected to the associated holding means for selective actuation thereof.
Crankshaft positioning and chucking apparatus for crankshaft machines having a headstock and a tailstock comprising, in combination, a frame, a headstock spindle and a tailstock spindle rotatably mounted upon said frame in spaced opposed, coaxial relationship, a first chuck mounted upon said headstock spindle, a second chuck mounted upon said tailstock spindle, crankshaft holding means defined on each of said chucks, said holding means comprising at least one movable jaw slidably mounted in its associated chuck in a direction transverse to the axis of said spindles, said jaw having sides, a first elongated cam member defined on a jaw side by spaced opposed surfaces and obliquely related to the direction of jaw movement, at least one cam plunger slidably mounted in each chuck in a direction transverse to the direction of movement of the jaw mounted in the associated chuck, said plunger having sides, a second elongated cam member defined on a plunger side by spaced opposed surfaces having a length obliquely related to the direction of plunger movement, one of said cam members comprising a groove and the other said cam members comprising a projection slidably received within said groove, said first and second cam members thereby mating one within the other whereby reciprocation of said plunger produces a positive sliding reciprocating movement of the associated jaw in both crankshaft clamping and releasing directions, at least one of said first and second cam members including rapid traverse and slow traverse cam surfaces for imparting rapid and slow reciprocation to the associated jaw during a constant rate of plunger reciprocation, and motor means mounted on each spindle operatively connected to the associated plunger for selectively producing reciprocating movement thereof.
Dependencies are inferred from the claim text.