Printing – Intaglio – Wipers
Patent
1973-11-14
1976-06-22
Eickholt, E. H.
Printing
Intaglio
Wipers
101170, 152565, 259DIG44, 310 36, 318129, B41F 3500, A46B 1500
Patent
active
039643867
ABSTRACT:
A method and apparatus for removing surplus ink from the surface of rotogravure printing cylinders by providing a doctor blade apparatus having an edge adjacent to but spaced from the surface of a rotating printing cylinder. The printing cylinder carries surplus ink and the doctor blade apparatus is disposed at some angle .alpha. with respect to a tangent to the printing cylinder and functions to remove all but a residual portion of the ink on the printing cylinder. To achieve this, the doctor blade is oscillated at a frequency sufficient to create a hydrodynamic barrier in the ink layer. This hydrodynamic barrier or turbulence in the ink layer at the doctor blade apparatus serves as a barrier for blocking passage of all but a predetermined desired residual portion of the ink layer past the oscillating edge of the doctor blade apparatus. The doctor blade apparatus can take many forms and can be oscillated in any desired manner. In accordance with one preferred embodiment, the doctor blade apparatus comprises an electrical coil to which an electrical signal is applied. Magnetic field creating means are disposed adjacent the electrical coil and either the magnetic field or the electrical signal in the electrical coil is varied to create oscillating movement of the doctor blade apparatus.
REFERENCES:
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patent: 3518463 (1970-06-01), Abbot
patent: 3730087 (1973-05-01), Trant
patent: 3747560 (1973-07-01), Roberts et al.
Eickholt E. H.
European Rotogravure Association
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