System for smoothing sheet against printing press cylinder - uses air nozzle with ends offset from middle part

摘要

The system smooths a sheet against the cylinder of a rotary printing press before the printing gap, using an air blast nozzle extending for most of the cylinder width. This is situated before and clear of the gap and aimed at the cylinder surface, being swung to and fro on a parallel axis in synchronism with the press. The ends of the nozzle (8) are offset from the middle part in the travel direction of the sheet, so as to smooth the sheet from the leading to the trailing edge, and from its middle towards both outside edges. ADVANTAGE - Maximum protection against crinkling and smearing.