(57) A service unit intended to be associated «in cascade» to a high-speed printer for
automatically converting the continuous paper web printed thereby into packages separated
from each other without causing any dead time during the work of the printer, the
number of the sheets forming the packages being either program-predetermined by the
service unit or directly determined by the printer through interfacing or printing
of suitable codes on the paper web. The service unit comprises a device for completely
disengaging from the printer when an interfacing between the two units is not available.
The service unit comprises in combination: a paper transport assembly using transport
holes and having a constant and adjustable maximum tension; an assembly for the connection
with the transport head comprising a plurality of sensors for detecting the necessary
data which vary according to the unit version; a paper guiding, folding and packaging
assembly for forming the package; a paper web cutting assembly for separating the
packages; a plane for holding the package being formed comprising a means for flattening
the upper portion of the package, which plane can be program operated; a means for
expelling the separated package; a means which can be extracted on request for facilitating
the repositioning of the package on the package holding plane; a means for detecting
the top of the package and other means and sensors necessary to the aim of the invention,
the operation of which is controlled by an electronic unit comprising a microprocessor.
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