Offset printing machine having two printing units

摘要

An offset printing machine having a first printing unit where an ordinary offset printing is achievable and a second printing unit where a number printing and perforating operations can be performed. The second printing unit has an impression cylinder independent of an impression cylinder of the first unit. The second unit is pivotally movable in horizontal plane with respect to the first unit. When the first and second units are connected to each other, offset printing process and subsequent numbering process are achieved. When the second unit is pivotted and is disconnected from the first unit, ordinary offset printing machine can be solely performed. A chain delivery section is provided in the first unit so as to transfer the printed sheet to the second unit. Tension control means is provided for controlling tension of the chain. Further, vertical and horizontal position fixing means are provided for fixing vertical and horizontal position of the second unit relative to the first unit.