WETTING WATER DETECTING DEVICE FOR OFFSET ROTARY PRESS

摘要

PROBLEM TO BE SOLVED: To rapidly and positively detect a defective printed matter based on the improper supply of a wetting water by projecting a low or a high frequency, an ultrasonic wave or an air pressure wave to a water from the jet aperture of a wetting water supply nozzle and interpret whether the wetting water is supplied, upon a wave receiving signal. ;SOLUTION: Wetting water injection nozzles are provided at almost a specified interval, and a set of a generator 8 and a wave receiving part 14 are installed near the jet aperture of the wetting water injection nozzle. An energy wave which is projected from the generator for generating a low or a high frequency wave, an ultrasonic wave or an air pressure wave, is emitted to the water level 12 of the wetting water, being transmitted through the wetting water and reflected by a reflecting part 22. In addition, the energy wave is reflected by the surface of the wetting water and is received by a wave receiving part 14. At the wave receiving part 14, the energy wave is subjected to an A/D conversion after amplification. A controller 16 enters an output signal from the wave receiving part 13 and a wetting water supply signal from a wetting water supply device, and interprets whether the appropriate wetting water supply is actually performed, if the wetting water supply signal is generated.;COPYRIGHT: (C)1997,JPO