To prevent the cooling liquid leakage from a compressor without enlarging a compressed air supply device.

The consumption state of a compressed air in a jet room 11 is transmitted to a control circuit 16 by a loom control computer C in response to ON-OFF of a start switch 13. When the jet room 11 is in a weaving state, the control circuit 16 continuously operates a compressor 19 at a higher rotational speed than the lower limit value of a rotational speed without water leak and also controls the open/close of the solenoid open/close valve 32 for controlling the water supply so as to continuously supply the water. When the jet room 11 is in a weaving stop state, the control circuit 16 operates the compressor 19 intermittently by the lower limit value and also controls the opening/ closing of the solenoid open/close valve 32 so as to supply the water only at the operation time of the compressor 19.