PRINTING UNITS OF PRINTING MACHINE Russian patent published in 2011 - IPC B41F13/30 

FIELD: printing industry.

SUBSTANCE: printing unit of a roll rotary printing machine comprises a blanket cylinder (06), a master cylinder (07) and a roll (41), interacting with a master cylinder as a crusher roll (41) of a moistening unit (09), and with the first roll (28) of a dyeing unit (08), interacting with the master cylinder (07) as a dyeing crusher roll (28). The dyeing unit has two rolling axially switching rolls (33; 33), which are serially arranged on the path of the dye passage between the system of dye feeding and the master cylinder (07). Two printing units with two interacting blanket cylinders (06) and their two master cylinders (07) together form a double printing unit. The first roll (28) has substantially the same diametre as the interacting master cylinder (07). In the working position the plane (A), formed with axes of rotation of the crusher roll (28) and the master cylinder (07), forms the following angle with the plane (E), formed by axes of rotation of the interacting master cylinder (07) and the blanket cylinder (06) - the angle δ, which makes 45° maximum. There is also a printing unit proposed for dry offset process without a moistening device.

EFFECT: proposed design of printing units has higher stability relative to bends/oscillations generated by beating in a channel.

53 cl, 31 dwg