US Patent No. 9,164,006

ROTATION TABLE WITH CLAMP TORQUE MEASUREMENT UNIT


Patent No. 9,164,006
Issue Date October 20, 2015
Title Rotation Table With Clamp Torque Measurement Unit
Inventorship Hiroki Tezuka, Yamanashi (JP)
Assignee FANUC CORPORATION, Yamanashi (JP)

Claim of US Patent No. 9,164,006

1. A rotation table comprising:
a workpiece placement table;
a motor of which one end of a rotation shaft is connected with the workpiece placement table and the other end thereof is
equipped with a detector for detecting the rotation shaft state;

a clamp mechanism that holds the workpiece placement table at a stop position;
a rotation instruction unit that generates a rotation torque in the motor;
a state monitoring unit that monitors a change in rotation shaft state based on the rotation shaft state information output
from the detector; and

a measurement unit that transmits a rotation instruction to the motor in a state where the workpiece placement table is clamped
by the clamp mechanism and measures a clamp torque based on motor torque information in accordance with the rotation instruction
and a change in rotation shaft state.