PURPOSE:To have a pneumatic bearing device with variable clearance to suit different operating conditions by forming the bearing tapered and by installing the bearing members movable in the axial direction. CONSTITUTION:A pair of pneumatic bearings 6, 7 are formed tapered. Among bearing members 3, 4, the one 4 is fixed to the base 5 while the other 3 is installed movably in the rorary shaft's 1 axial direction under guidance of a guide 10 furnished at the base 5. At the bearing surface of the bearing member 3, a pressure sensor 15 is installed recessedly to sense the pressure P in the pneumatic bearing 6. Output signal p from this pressure sensor 15 is transmitted to an operational part 16 to move the bearing member 3 to the left and right by driving a feed motor 14. Thereby bearing clearance C can be changed.
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