| 摘要 |
PCT No. PCT/SE94/00954 Sec. 371 Date May 29, 1996 Sec. 102(e) Date May 29, 1996 PCT Filed Oct. 11, 1994 PCT Pub. No. WO95/10414 PCT Pub. Date Apr. 20, 1995Device for wetting and/or cleaning solenoids in an offset rotary printing machine having a plate cylinder, an offset cylinder and an impression cylinder. The device comprises wetting cylinders running against the plate cylinder and a ramp with several nozzles for spraying liquid towards the wetting solenoids in atomized condition, said ramp being mounted in parallel with the rotational axes of the cylinders. A valve is provided for each nozzle having at least one separate solenoid controlled inlet for liquid and an outlet to the associated nozzle. The solenoid control inlet comprises a valve with a solenoid armature (25) which is spring biased towards the closed position of the valve, and a valve element (26, 27) displaceably mounted in the solenoid armature and spring biased towards the closed position of the valve, said valve element in this position engaging a valve seat. Abutments (30, 31) for limiting the displacement of the valve element in relation to the solenoid armature under the spring bias of the valve element are provided on the solenoid armature and the valve element, said abutments being kept separated against the spring bias of the valve element when the valve element engages the valve seat. The invention also relates to a method in operating the device wherein the solenoid current at opening of the valve after an initial increase at constant voltage over the solenoid is adjusted to a predetermined value which is maintained for a predetermined period the current then being decreased below the predetermined value to be kept at a lower value while the valve is in open position. |
