B - Operations – Transporting – 41 – F
Patent
B - Operations, Transporting
41
F
B41F 31/00 (2006.01) B41F 31/02 (2006.01)
Patent
CA 2206816
Disclosed is an ink fountain unit for a printing press comprising a frame (F), a relatively elongated cylindrical transfer roll (11) mounted in the frame for rotation about the cylinder axis. A relatively elongated ink fountain (10) is mounted on the frame adjacent the roll and parallel thereto, the fountain being equipped with ink delivery means (15) so as to maintain an ink level therein. The fountain is equipped with generally planar doctor and containment blades (16,18) and end seals (20) all having edges bearing against the roll to define a closed chamber for ink. Each of the end seals is oriented in relatively elongated, spaced apart first and second angled bearing surfaces (28,29) confronting respectively the doctor and containment blades and an arcuate bearing surface (27) confronting the roll between the angled surfaces. Each of the bearing surfaces has a longitudinal edge adjacent the ink chamber and the end seal has a first side wall extending away from the first edge. The invention is characterized by a closed perimeter recess (21) in the first side wall (22) generally aligned with the arcuate bearing surface so as to provide local seal stiffness greater at the blade bearing surfaces than at the roll bearing surface. The invention also pertains to a method of operating a printing press comprising the steps of providing a fluid fountain unit (10) including a transfer roll (11) and a chamber (13) defined by a holder adjacent the transfer roll, the chamber including doctor and containment blades (16,18) and unitary end seals (20) all bearing against the transfer roll characterized by applying a first lineal pressure by the end seals against the transfer roll and applying a second and higher lineal pressure against the doctor and containment blades.
Compton Craig T.
Zeman Dale E.
Finlayson & Singlehurst
Paper Converting Machine Company
LandOfFree
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