A printing unit having at least one press unit, the, or each, press unit
having at least one form cylinder, a transfer cylinder, an inking unit
and preferably a damping unit, and having at least one imaging device for
imaging and/or de-imaging a rewritable and erasable printing form
positioned on the form cylinder. The inking unit, if appropriate together
with the damping unit, can be pivoted with respect to a form cylinder
from a printing position into a rest position. The imaging device can be
pivoted with respect to the form cylinder from an imaging position into a
rest position. The imaging device is pivoted into a rest position when
the inking unit and, if appropriate, damping unit is pivoted into the
printing position and, when the imaging device is pivoted into the
imaging position, the inking unit and, if appropriate, the damping unit
is pivoted into a rest position.