Patent ID: 8137160

Claim:
A gear matching device which performs gear matching so as to establish a rotational phase relationship between a rotary tool and a gear to be machined in which the rotary tool and the gear can mesh with each other, before gear machining is performed by causing the rotary tool and the gear to mesh with each other, and by then relatively rotating the rotary tool and the gear, the gear matching device comprising: a rotary table which rotates the gear about an axis thereof; a tail stock which is supported to be movable in the axial direction of the gear, and by which the gear is held between a tail stock center and the rotary table, the tail stock center being rotatably supported on a lower end of the tail stock; a sensor which is provided to the tail stock, and which faces the gear to detect the rotational phase thereof, when the tail stock holds the gear between the tail stock center and the rotary table; a rod which is provided to the tail stock, and which supports the sensor with a supporting plate in between; a stopper which is caused to abut on the supporting plate when the tail stock is moved toward the rotary table; and a spring which is provided in a contracted state between the supporting plate and the rod to thereby bias the supporting plate downward with respect to the rod, and absorbs a machining error in the axial direction of the gear to thereby keep the detection position of the sensor constant in the axial direction of the gear when the gear is held between the tail stock and the rotary table.