Rotogravure printing units - Patents

Rotogravure printing units

Patent Agent: Douglas R Hanscom Jones Tullar & Cooper - Arlington, VA, US
Patent Inventor: Uwe Johann Riedel
Applicaton #: 20070051256
Class: 101153000 (USPTO)
Related Patents: Printing, Intaglio, Rotary
03/08/07

A rotogravure printing unit includes a forme cylinder and an inker unit. The inker unit includes a trough which holds liquid or pasty ink. A first inking roller, which can rotate inside the trough, extends over a first width section of the trough and the forme cylinder. A second inking roller, which can also rotate inside the trough, extends over a second width section of the forme cylinder or the trough.
SUMMARY OF THE INVENTION
[0011] The object of the present invention is directed to providing a rotogravure printing unit.
[0012] The object is attained, in accordance with the present invention, by the provision of a rotogravure printing unit which has a rotogravure printing cylinder and an inking unit. The inking unit includes at least three inking rollers which can be placed against the forme cylinder. Each of these inking rollers can be moved, with respect to the forme cylinder, independently of the other inking rollers. At least one of these inking rollers may overlap the other two rollers in an axial direction of the rollers and the printing cylinder.
[0013] The advantages which can be achieved by the invention reside, in particular, in that such an inking unit allows even inking, even of wide forme cylinders, because several inking rollers are provided, and because of which, individual inking rollers can be employed for inking problematical areas of the forme cylinder. A single inking roller does not need to extend over the entire width of the surface of the forme cylinder to be inked. Instead, the width of the individual inking roller will preferably be limited to a surface area of the forme cylinder which can be inked without problems. Adjoining surface areas of the forme cylinder will each be assigned their own inking roller. With such an inking unit, the several short inking rollers can all be brought into contact with the forme cylinder, each over their entire width.
[0014] The inking rollers can be arranged so that they are staggered in the inking unit. Staggering of the inking rollers can take place over the forme cylinder width, as well as over a length of the trough.
[0015] In this case, preferably at least two inking rollers are arranged along the same shaft.

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