Printing – Planographic – Dampeners
Patent
1998-04-17
1999-11-30
Burr, Edgar
Printing
Planographic
Dampeners
B41L 2500
Patent
active
059923172
ABSTRACT:
An offset printing machine having a plate cylinder which carries a printing form and which is operatively connected to an inking unit and a dampening unit is provided. The dampening unit includes a dampening applicator roller which is mounted in contacting relation with the dampening applicator roller. The dampening applicator roller also includes at least one auxiliary roller which is mounted in contacting relation with the dampening applicator roller downstream or after the contact point between the dampening applicator roller and the plate cylinder. The auxiliary roller has a surface with a coating of non-stick material which blocks the transfer of ink and dampening medium to the surface of the auxiliary roller and is axially movable relative to the dampening applicator roller and selectively rotatable at circumferential speeds substantially equal to or different from the circumferential speed of the dampening applicator roller.
REFERENCES:
patent: 3613575 (1971-10-01), Kantor
patent: 3926116 (1975-12-01), Wildeman
patent: 4287827 (1981-09-01), Warner
patent: 4724764 (1988-02-01), MacPhee et al.
patent: 5025724 (1991-06-01), Holl et al.
Der wasserlose Offsetdruck (Trockenflachdruck), Offset Druck Polygraph Handbuch, Wolfgang Walenski Chapter 33, pp. 217,218.
Hummel Peter
Ortner Robert
Raab Rudolf
Burr Edgar
MAN Roland Druckmaschinen AG
Sandusky Amanda B.
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