DEVICE AND METHOD FOR INDEXING THE PHASE OF A CRANK PIN

摘要

In a crank pin grinding machine, device and method for indexing the phase of a crank pin that can index the phase while a spindle is being rotating. The device comprises a pair of spindles (23, 24) disposed on a first axis ( alpha ) so as to be separated away from and facing each other and adapted to be driven synchronizing with each other, a chuck main body (26, 27) provided on a leading end of each of the spindles for gripping a crank shaft (34) on a second axis ( beta ) that is parallel to the first axis ( alpha ), a phase changing shaft (55) provided on the second axis ( beta ) of at least one of the chuck main bodies for indexing crank pins (40-42) having different phase angles on the first axis ( alpha ) and a phase indexing shaft (65) coupled to the phase changing shaft so as to be rotatingly driven concentrically with the spindles, the device being controlled such that a first mode in which the phase changing shaft is rotated in a synchronized fashion at the same speed as that of the spindles and a second mode in which the phase changing shaft is rotated in a synchronized fashion with a relative speed difference are effected.