Device for the dosing of paint by pumping supplied paint nozzles onto colour transfer rollers of a colour works

摘要

An ink fountain of the type in which ink is metered from nozzles located in respective zonal positions. The nozzles have narrow axially extending openings in general alignment with one another closely side by side. A tank is provided adjacent the fountain roller, with the nozzles being in the form of slots at the bottom of the tank, the tank being sealed and connected to a source of viscous ink under predetermined pressure. Reciprocable slides are arranged side by side interposed between the nozzles and the surface of the fountain roller, each slide having a reference position for normally blocking off ink flow from the associated nozzle and being retractable to open the nozzle. A solenoid is connected to each of the slides for forcibly and temporarily retracting the slide from its reference blocking position. Each solenoid has a biasing spring for restoring the slide to its reference blocking position. An individually adjustable timing device is controllingly connected to each solenoid for cyclically energizing it for pre-set intervals of time which correspond to the ink requirement in the respective zonal position. The tank in the preferred embodiment is supplied with ink through a supply line fed by a pump from an open reservoir.