B - Operations – Transporting – 41 – F
Patent
B - Operations, Transporting
41
F
B41F 7/20 (2006.01) B41F 13/02 (2006.01) B41F 23/02 (2006.01)
Patent
CA 2171919
An apparatus to control the humidity of a web such as paper or cardboard in a printing machine and a process for controlling said humidity. The device consists of a photo- electric detector for detecting the position of a mark on the right and a mark on the left of a first station and detecting the position of marks on the right and the left of printing effected by following stations. Electronic means for determining the difference in width of the marks from one station to the other. Said electronic means generating a correction signal when the difference is not zero. The said signal is applied to a heating plate or a roller which is in contact with the web in order to adjust the value of the humidity of the web to the initial value it had when entering the machine.
Bobst S.a.
Smart & Biggar
LandOfFree
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