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US 9,227,284 B2Granted
Rotary table device
AssigneeFanuc Corporation
InventorTomoya Itou
Life of this patent
Estimating the term…
Abstract
The inside of a case of a rotary table device is divided into a first space and a second space. The pressure of the first space is regulated to a pressure higher than the pressure of the second space during a steady state. The relationship between the pressures is reversed at a certain timing, to make the pressure of the second space higher than the pressure of the first space. Such operation can forcibly close a check valve disposed between the first space and the second space on regular basis, thereby preventing a malfunction of the check valve.
Claims6
A rotary table device, comprising:
- a case;
- a motor stored in the case;
- a table fixed to one end of an output shaft of the motor;
- a discharge port discharging air from the inside of the case to the outside;
- and
- a pressure regulating unit, wherein
- the case has:
- first and second spaces partitioned with a partitioning member;
- a first air supply path supplying air to the first space;
- a second air supply path supplying air to the second space;
- and
- a check valve provided in the partitioning member, and wherein
- the discharge port discharges the air from the second space to the outside of the case, and
- the pressure regulating unit constantly regulates a pressure of the first space and a pressure of the second space to a pressure higher than an outside pressure, and regulates the pressure of the first space to a pressure higher than the pressure of the second space during a steady state, but regulates the pressure of the second space to a pressure higher than the pressure of the first space at a certain timing.
11 more elements
Dependencies are inferred from the claim text.