Patent ID: 6672184
Filing Date: 2004-01-06
Classification: B23B,Y10T

Abstract:
A crankpin lathe wherein work heads are mounted on a bed for supporting work spindles driven by work spindle drive devices, respectively; said work spindles are provided for clamping journals of a crankshaft thereon with a crankpin being on the rotational axis of said work spindles; and a tool head for attaching cutting tools is mounted on said bed to be moved by a tool head feed device relative to said work heads for turning said crankpin; said crankpin lathe further comprising: index members supported respectively on said work spindles for rotation about an axis which is parallel with, and offset by an eccentricity of said crankpins, from the axis of said work spindles; clutch mechanisms each interposed between said index member and said work spindle for restraining the relative rotation between said index member and said work spindle when brought into engagement, but for permitting the relative rotation when released from engagement; clamp devices provided respectively on said work spindles for removably clamping said journals; a pin pusher mounted on said bed and movable by a pin pusher feed device toward the axis of said work spindles for causing said pin pusher to push said crankpin; and a control device for positioning the machined crankpin to a position spaced by a predetermined distance from the axis of said work spindles by pushing with said pin pusher said machined crankpin with said clutch device being made disengagement and for rotating said work spindles by half an angle through which said crankshaft is to be indexed rotationally relative to said work spindles so as to position a crankpin to be machined next onto the axis of said work spindles before bringing said clutch device into engagement.