Printing unit for a web-fed rotary printing machine

摘要

A web fed rotary printing machine has at least two pairs of cylinders (21 and 22) consisting of one transfer (25, 26) one forme (23, 24) and one printing / impression cylinder (27). Bearer or Schmitz rings (29) are attached to the ends of the transfer and forme cylinders. The print cylinder does not have any bearer rings fitted. The deletion of bearer rings serves to reduce pressure loadings on the roller drive train and improves bearing life. The forme and transfer cylinders may be sized to print up to six pages of print arranged axially side by side. The forme and transfer cylinders may have gaps in them for taking up dressings, printing plates or transfer blankets. The gaps may be staggered in a circumferential position.