US 2020/0055306 A1 · METHOD AND DEVICE FOR OPERATING A ROTARY SCREEN-PRINTING MACHINE

Abstract

A screen-printing unit in a printing machine comprises a screen cylinder which carries a screen-printing stencil and in which a squeegee is moved, from the inside, into contact with, and away from the screen-printing stencil. The screen cylinder is moved into contact with an impression cylinder, such that a printing position is formed, and is moved away therefrom, such that a gap is formed. The screen cylinder is moved away from the impression cylinder, in a first phase, when the squeegee is in a non-contacting position. In a second phase, at least one sheet of printing material is passed through the printing position when the squeegee continues to be in a non-contacting position and the screen cylinder is at least temporarily in a contacting position. For subsequent sheets of printing material, in a third phase, the screen-printing unit is operated with the squeegee one of permanently and cyclically, such as at least once for each sheet of printing material, in a contacting position.

Claims17

Dependent claims

1-20. (canceled)

A method for operating a screen printing unit (19;

23) in a printing press comprising a screen cylinder (18;
22), which carries a screen printing forme (31;
32) and in which a squeegee (34) can be engaged from the inside against the screen printing forme (31;
32) and disengaged therefrom, and which screen cylinder can be thrown onto an impression cylinder (21) such that a print position (06;
07) is formed and can be thrown off of said impression cylinder such that a gap is formed, wherein
in a first phase, the screen cylinder (18;
22) is thrown off of the impression cylinder (21) while the squeegee (34) is in a disengaged position,
in a second phase, multiple printing substrate sheets (02) are conveyed through the print position (06;
07) while the squeegee (34) remains in a disengaged position and the screen cylinder (18;
22) is at least temporarily thrown on,
and finally, in a third phase, for subsequent printing substrate sheets (02) an operation is carried out in which the squeegee (34) is in an engaged position, perpetually or cyclically at least once for each printing substrate sheet (02).

8 more elements

Dependencies are inferred from the claim text.

Facts

Application

16/487,499Filed 22 Sep 2017

Priority

DE 10 2017 202 941.223 Feb 2017

Published

20 Feb 2020

Term ends

Not estimatedThe source records don’t support an estimate.

Classification16 codes

B41F 15/0809
For printing sheets: with cylindrical or belt-like screens
B41F 11/02
Rotary presses or machines having forme cylinders carrying a plurality of printing surfaces, or for performing letterpress, lithographic, or…: for…
B41F 13/26
Cylinder-tripping devices; Cylinder-impression adjustments: arrangement of cylinder bearings
B41F 13/32
Arrangement of cylinder bearings: bearings mounted on swinging supports

Method and device for operating a rotary screen-printing machine

Life of this patent

Method and device for operating a rotary screen-printing machine

Life of this patent

Abstract

Claims17