US Patent No. 9,527,184

ROTATION TABLE DEVICE


Patent No. 9,527,184
Issue Date December 27, 2016
Title Rotation Table Device
Inventorship Tomoya Itou, Yamanashi (JP)
Assignee FANUC CORPORATION, Yamanashi (JP)

Claim of US Patent No. 9,527,184

1. A rotation table device, comprising:
a casing;
a pressure adjustment unit configured to maintain a pressure inside the casing to be higher than the atmospheric pressure
by air supplied from a purge air supply port, and to prevent the intrusion of a cutting fluid; and

a rotation member rotatably supported by the casing;
a work attachment portion at one end of the rotation member; and
a clamping mechanism configured to prohibit the rotation of the rotation member;
wherein the clamping mechanism comprises:
a brake disk fixed to the rotation member; and
a target braking member fixed to the casing, and
a braking member including a contact surface and configured to be operated in the axial direction of the rotation member by
air or working oil between a clamped and an unclamped state;

in the clamped state, the contact surface of the braking member presses the brake disk against the target braking member to
fix a position of the work attachment portion, and in the unclamped state, the contact surface of the braking member is spaced
from the brake disk to allow rotation of the work attachment portion,

the braking member comprises:
a groove or a hole that allows the pressure inside the casing on opposite sides of the contact surface to be fluidly connected
and maintained higher than the atmospheric pressure in both the clamped and unclamped states.