Method and apparatus for cleaning an inking mechanism and/or a printing mechanism in printing units of rotary printing machines
AssigneeHeidelberg Harris, Inc.
InventorsDave C. Gibson, Richard B. Mack, Glenn A. Guaraldi
Life of this patent
Estimating the term…
Abstract
A method of cleaning a mechanism having ink-conducting rollable cylindrical members in a printing unit of a rotary printing press includes spraying solvent into a nip between the ink-conducting rollable cylindrical members, rotating the ink-conducting rollable cylindrical members so as to squeeze the solvent through the nip between the rollable cylindrical members and thereby apply pressure in the nip to an ink/dampening solution mixture on the rollable cylindrical members for loosening the mixture, and removing loosened ink and impurities from the printing unit; and apparatus for performing the method.
Claims17
In a printing unit of a rotary printing press having inking and printing mechanisms, apparatus for cleaning the inking and printing mechanisms comprising
- means for spraying solvent in respective given directions into a nip between ink-conducting cylinders in the printing mechanism simultaneously along the entire width of said ink-conducting cylinders of the printing mechanism and into a nip between ink-conducting rollers in the inking mechanism simultaneously along the entire width of said ink-conducting rollers of the inking mechanism,
- an engageable and disengageable washing device disposed opposite the nip between the ink-conducting cylinders in the printing mechanism, said solvent-spraying means for said ink-conducting cylinders being included in said engageable and disengageable washing device, a respective pivot arm for moving said washing device, terminal switches for protectively limiting said washing device to adjusted positions thereof,
- means for rotating the cylinders and rollers in the given direction at the respective nips so as to squeeze the solvent through said nips, respectively, between said cylinders and said rollers and thereby apply pressure in said nips to an ink dampening solution mixture on said cylinders in the printing mechanism and on said rollers in the inking mechanism for loosening said mixture,
- and means for removing loosened ink and impurities from the printing unit.
Method of cleaning from a plate cylinder and a blanket cylinder of a web-fed rotary printing machine ink which has been deposited thereon, which comprises:
- spraying solvent in a given direction into a nip between the plate cylinder and the blanket cylinder simultaneously along the entire width of the cylinders while rotating the cylinders in the given direction at the nips so that the solvent is squeezed through the nip and, due to the pressure in the nip, dissolves the ink on the cylinders, directing the sprayed solvent so that it remains on the plate cylinder for a longer working period than on the blanket cylinder, drying the plate cylinder with the blanket cylinder, and drying the blanket cylinder and removing impurities therefrom with the web fed to the printing machine.
In a printing unit of a web-fed rotary printing machine having ink-conducting printing-mechanism cylinders, apparatus for cleaning the ink-conducting cylinders, comprising a washing device disposed opposite a nip between ink-conducting printing-mechanism cylinders on a side of the printing unit disposed opposite to a side thereof at which a web is fed into the printing unit, the ink-conducting printing-mechanism cylinders being at least one plate cylinder and at least one blanket cylinder, at least one of said cylinders having an outer cylindrical surface formed without a channel, said washing device comprising a spray bar, and including wiping means disposed on said side of said printing unit opposite to the side thereof on which said washing device is disposed, said wiping means being in cooperative engagement with said at least one cylinder without a channel in the outer cylindrical surface thereof.
Dependencies are inferred from the claim text.