Abstract: A method of preventing an ink from increasing in viscosity is praticed by repeatedly performing the steps of supplying provided from an ink supply-aspiration nozzle to an ink reservoir provided between an inking roll and a squeeze roll pressed into contact with the inking roll, moving the nozzle toward one end of the reservoir and causing the nozzle to aspirate a predetermined amount of ink to produce a flow of ink in the reservoir toward the end thereof, and moving the nozzle toward the other end of the reservoir and similarly causing the nozzle to aspirate a predetermined amount of ink to thereby produce a flow of ink toward the other end. A diluting liquid is supplied to the reservoir while performing these steps.

Abstract: An ink squeezing device for an anilox roll comprises a doctor blade adapted to contact the roll at an angle against the direction of rotation of the roll, and a bank member supporting the doctor blade along the anilox roll. An ink fountain is formed by the doctor blade, the anilox roll, the bank member and a pair of dam members. The ink squeezing device is coupled to a pressure cylinder device for pressing the doctor blade against the anilox roll. The cylinder device presses the doctor blade against the anilox roll during printing and during cleaning of the anilox roll. The doctor blade also serves the function of scraping off a cleaning liquid from anilox roll during cleaning of the roll.

Abstract: An ink supplying and collecting device for an ink reservoir formed between a main roll for applying an ink to a plate cylinder and an auxiliary roll in contact with the main roll, the device being adapted to supply the ink to the ink reservoir by causing the ink to flow out from a nozzle extending downward as directed toward the ink reservoir while moving the nozzle in parallel to axia direction of the rolls, and to collect the ink by lowering the nozzle to a position close to the bottom of the ink reservoir and drawing up the ink with the nozzle while moving the nozzle in parallel to the axial direction of the rolls.