| 摘要 |
A varnishing assembly in a printing press for applying a layer of varnish to a sheet on a press cylinder. The assembly includes a varnish fountain made up of a tray and fountain roller with an applicator roller interposed between the fountain roller and the cylinder. Storage tanks are respectively provided for varnish, fresh detergent and used detergent. The tray is equipped with an outlet line and an inlet line for drainage and filling. The outlet line has a two-position shut-off valve and the inlet line has a pump and pump drive motor. A two-position, three-connection drain valve is provided having an inlet connected to the outlet line of the tray end outlets connected to the varnish tank and the used detergent tank. The system also includes a two-position, three-connection fill valve having inlets connected to the varnish tank and the fresh detergent tank and an outlet connected to the tray inlet line. Means are provided for switching the valves and motor to produce a cleaning cycle in which (a) varnish is drained from the tray into the varnish tank, (b) fresh detergent is pumped to the tray from the fresh detergent tank for cleaning up the residual varnish, (c) the used detergent is drained from the tray into the used detergent tank. The drained varnish is subsequently pumped from the varnish tank to the tray for resumption of varnishing.
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