Security printing press having at least one printing assembly, and method for operating a squeegee device

Patent metadata

Field	Value
Publication number	US-10427398-B2
Application number	US-201515538214-A
Country	US
Kind code	B2
Filing date	Dec 9, 2015
Priority date	Dec 22, 2014
Publication date	Oct 1, 2019
Grant date	Oct 1, 2019

Abstract

A squeegee device for a printing press, which prints a printing material, at at least one printing point, in accordance with a screen printing process, comprises a screen printing screen, a squeegee which is one of set against the screen printing screen in a thrown-on position and can be set against the screen printing screen In a thrown-on position, a bearing device which makes a throwing-on and throwing-off movement possible between the thrown-on position of the squeegee and a thrown-off position, and a drive device, by the use of which, the squeegee can be set against the screen printing screen and can be set away from the latter during operation in a manner which is correlated to a press or printing material phase position. The drive device is set up to one of bring about and to make possible throwing-on and throwing-off of the squeegee in sequences which differ from one another in one of different positions and the phase lengths in relation to the length of the screen printing screen.

First claim

The invention claimed is:

1. A security printing press having at least one printing assembly including a printing unit, by the use of which printing unit a sheet-type printing substrate can be printed on using a screen printing method, the printing unit having at least at one printing point formed between a screen cylinder and an impression cylinder, the at least one printing assembly having one or more drying units disposed downstream of the printing assembly on a printing substrate path, and having a squeegee device, which is part of the printing unit, which squeegee device comprises
a screen printing forme,
a squeegee, which is one of set against the screen printing forme in a thrown-on position (“ON”) and can be set against the screen printing forme in the thrown-on position (“ON”),
a bearing device, which enables a throwing-on and throwing-off movement of the squeegee between the thrown-on position (“ON”) of the squeegee and a thrown-off position (“OFF”) of the squeegee,
and a squeegee drive device, by the use of which squeegee drive device, the squeegee can be thrown on and off of the screen printing forme during operation of the printing unit, in a manner which is correlated to one of a press and a printing substrate phase position,

wherein
an inking aid ( 29 ) is provided, by the use of which inking aid, an opening of a pit, located on a lateral surface of the impression cylinder and a retaining device for printing substrate sheets, and located in the pit, can be at least partially covered, at least temporarily, at least in a trailing area of the opening, and
wherein the squeegee drive device includes a drive means, which can be controlled by a control device and by which the throwing-on and throwing-off movement of the squeegee one of can be and is brought about mechanically independently of the one of the press and the printing substrate phase position, and which squeegee drive device is configured to one of bring about and to enable a throwing on and throwing off of the squeegee in sequences that are different from one another, with one of phase positions and phase lengths that are different in relation to the length of the screen printing forme, the squeegee drive device comprising a cam mechanism which is driven by the drive means and by which the squeegee is thrown on and off, and wherein the control device controls the squeegee drive device to be driven at an angular speed which one of can be and is varied over the course of a full revolution of the cam disk.

2. The security printing press according to claim 1 , further including an additional drying unit, which is provided between the at least one printing point and a point downstream in the printing substrate path, at which the printing substrate, on a side of the printing substrate, that has been printed by the at least one printing point, comes into physical contact with a succeeding rotary body.

3. The security printing press according to claim 1 , wherein squeegee drive device can be placed in a first operating state (BZON) that brings about the thrown-on position of the squeegee (“ON”) and in a second operating state (BZON) that brings about the thrown-off position of the squeegee, (“OFF”) by use of the drive means, and without a mechanically rigid coupling to a press element that represents one of the press position and the printing substrate phase position.

4. The security printing press according to claim 1 , wherein the control device, that is in signal communication with the drive means, throws the squeegee on and off, with one of varying phase lengths and phase positions, dependent on information I(F); I(LB); I(M) that relates to one of the printing substrate format and the print image, and that is provided to the control device.

5. The security printing press according to claim 1 , wherein one of the length and position and number of phases (PON) relating to the thrown-on position “ON”, within a recurring sequence that is fixed in terms of its length, can be varied by a control means contained in the control device, dependent on information I(F); I(LB); I(M) that relates to the one of printing substrate format and the print image.

6. The security printing press according to claim 1 , wherein one of the drive means and the control device that controls the drive means is in signal communication with a master axis encoder configured as an electronic master axis, that represents the one of the press phase position and the printing substrate phase position, and which serves as a master for controlling the drive means in terms of one of the length and the position of a throwing-on and throwing-off sequence of the squeegee.

7. The security printing press according to claim 1 , wherein the drive means of the squeegee drive device is a linearly acting drive means having a cylinder/piston system that can be acted on by one of pressurized fluid and an electrically operated linear drive.

8. The security printing press according to claim 1 , wherein the drive means is embodied as one of an angular position controllable electric.

9. The security printing press according to claim 1 , wherein the squeegee drive device, that brings about the throwing on and throwing off of the squeegee engages, on an output side, with a squeegee support that supports the squeegee, that extends within the screen printing forme, and that preferably extends over at least the length of the squeegee, as viewed in an axial direction of the screen printing forme.

10. The security printing press according to claim 1 , wherein the inking aid is configured as a flap.

11. A method for operating a squeegee device in a security printing press, for printing on a sheet-type printing substrate using a screen printing method, including;
providing at least at one printing point in a printing unit contained in a printing assembly;
including one or more drying units in the printing press and on a printing substrate path disposed downstream of the printing assembly;
providing a squeegee which is thrown onto and off of a screen printing forme in a recurring cycle comprising a sequence of one or more phases (PON) relating to a thrown-on position “ON” and one or more phases (POFF) relating to a thrown-off position (“OFF”);
correlating one of the length and the position of the cycle to one of a press phase length and a printing substrate phase length and a phase position;
throwing the squeegee on and off according to a sequence depending on one of a current printing substrate format and print image;
providing a squeegee drive device including a drive means that can be controlled by a control device and a cam mechanism, and by which squeegee drive device the throwing-on and throwing-off movement of the squeegee can be brought about mechanically independently of the one of the press phase position and the printing substrate phase position;
using the control device for driving the drive means of the squeegee drive device at an angular speed which one of is and can be varied over the course of a full revolution of the cam disk; and
throwing on the squeegee in advance, within the sequence that is correlated to the one of the press phase position and the printing substrate phase length and phase position, such that the squeegee is disposed in its thrown-on position (ON) to form a bead of ink before a leading end of the printing substrate sheet enters a nip point that is formed at the printing point between screen printing forme and counter bearing.

12. The method according to claim 11 , further including throwing the squeegee on and off within the cycle with one of varying phase lengths and phase positions, dependent on information I(F); I(LB); I(M) relati

Assignees

• Koenig & Bauer Ag

Inventors

• Booth Bradley
• Gygi Matthias
• Schwitzky Volkmar
• Stöhr Manfred

Classifications

• B41F15/44 Primary

  Squeegees or doctors · CPC title

• B41F15/0836

  by means of cylindrical screens or screens in the form of endless belts · CPC title

• B41F15/42

  comprising squeegees or doctors · CPC title

• B41F15/34

  Screens, Frames; Holders therefor · CPC title

• B41F15/0809 Primary

  with cylindrical or belt-like screens · CPC title