it possible to fit together a variable number of treatment units which are similar with respect to one another to form an equipment unit which depending on the configuration stage is suitable for different treatment processes application_number US 38397289 A description the processing machine shown in fig1 comprises an input unit a and two treatment units b and b 39 only a fragment of the latter being visible in the drawing the input unit comprises a box 1 with a cover 2 which in turn has a hinged lid 3 as an access to the interior of the box for inserting a sheet in its upper area the box has a pair of draw in rollers 4 4 39 which conveys an inserted sheet to an outlet opening 5 and through this outlet opening 5 into the feeding channel of the connecting treatment unit a feeder plate 6 directs the sheet into the roller gap while guide vanes 7 which on the outlet side project from the interior side of the cover 2 feed the sheet edge leaving the pair of rollers to the outlet edge projections 8 and 9 of the hinged lid 3 interacting with form locking edge parts 10 and 11 of the box or of the cover prevent light from entering into the box when the cover is closed in reference to fig1 and 2 the treatment unit.