Printing press and method for producing printed products

Patent metadata

Field	Value
Publication number	US-11214053-B2
Application number	US-202017287159-A
Country	US
Kind code	B2
Filing date	Mar 13, 2020
Priority date	Apr 3, 2019
Publication date	Jan 4, 2022
Grant date	Jan 4, 2022

Abstract

A printing press has at least one printing unit that comprises one or more printing couples, by the use of which printing press, sheet-format substrate can be printed on at least one side in at least one printing nip. The printing press has at least one product receiving unit, in which the printed sheet-format substrate can be collected to form bundles of products or intermediate products. A rotatable cooling cylinder, for guiding or conveying the sheet-format substrate, is located upstream of the product receiving unit in the substrate path. At least one first electrode is arranged on, and is directed towards the substrate path section that runs over a circumferential section of the cooling cylinder. When an electric voltage is applied to the substrate path, substrate being guided along the substrate path past the electrode is or can be electrostatically charged.

First claim

The invention claimed is:

1. A printing press comprising:
at least a first printing unit that comprises one or more printing couples, by the use of which at least first printing unit sheet-format substrate can be printed on at least one side in at least one printing nip;
at least one product receiving unit located after, in a direction of a substrate travel path, the at least first printing unit and in which the printed sheet-format substrate can be collected to form one of bundles of products and intermediate products;
a rotatable cooling cylinder for one of guiding and conveying the sheet-format substrate, the rotatable cooling cylinder being located upstream of the at least one product receiving unit and downstream of the at least one printing unit comprising the one or more printing couples in the direction of the substrate travel path, the rotatable cooling cylinder having an outer circumferential surface defining a section of the substrate travel path;
at least a first electrode spaced apart from and directed toward the section of the substrate travel path that runs over the outer circumferential section of the rotatable cooling cylinder, whereby, when an electric voltage is applied to the substrate path, by the at least first electrode, the substrate being guided along the substrate path past the at least first electrode one of is and can be electrostatically charged; and
an assistant substrate positioning device that physically positions the substrate against the circumferential surface of the rotatable cooling cylinder, the assistant substrate positioning device being different from the at least first electrode and being positioned upstream of the at least first electrode in the substrate travel path at a maximum angle of 25° with respect to the at least first electrode, as viewed in a circumferential direction of the rotatable cooling cylinder.

2. The printing press according to claim 1 , one of wherein the at least first electrode lies no more than 60° downstream of a first point at which the sheet-format substrate is received from an upstream conveyor device onto the rotatable cooling cylinder in the substrate travel path and wherein the sheet-format substrate is directed toward a surface of the rotatable cooling cylinder in a region of a lower half of the surface of the rotatable cooling cylinder.

3. The printing press according to claim 1 , wherein a second electrode is directed toward the substrate travel path on the rotatable cooling cylinder, the second electrode one of lying between a first point at which the sheet-format substrate is received by the rotatable cooling cylinder and a second point at which the sheet-format substrate runs off of the rotatable cooling cylinder and is transferred to a subsequent conveyor device and lying at a maximum distance of halfway, +/−15°, between the first point at which the substrate is received by the rotatable cooling cylinder and the second point at which the substrate runs off of the rotatable cooling cylinder and is transferred to the subsequent conveyor device.

4. The printing press according to claim 1 , one of wherein a further electrode that one of acts as a discharge electrode and that has a polarity inverse to a polarity of the at least first electrode, and is grounded, is provided and wherein an electrically conductive stripping device is provided and is located on an outer circumference of the rotatable cooling cylinder at a distance of no more than 45° from a point of transfer of the sheet-format substrate from the rotatable cooling cylinder to a conveyor device that follows the rotatable cooling cylinder.

5. The printing press according to claim 1 , wherein the rotatable cooling cylinder one of is configured as multi-sectional with respect to the substrate sections to be transported, and is configured such that coolant can flow through it.

6. The printing press according to claim 1 , wherein the rotatable cooling cylinder has, on its outer circumferential surface, at least one substrate holding device configured as gripper bars, on which gripper bars the sheet-format substrate can be received from a first conveyor and a first transport cylinder arranged upstream of the rotatable cooling cylinder and configured as a first circulating gripper conveyor, and from the first circulating gripper conveyor the sheet-format substrate can be transferred to grippers of a second conveyor configured as one of a second circulating gripper conveyor and a transport cylinder that follows downstream of the first circulating gripper conveyor.

7. The printing press according to claim 1 , one of wherein a first one of the one or more printing couples is configured as a screen printing couple, and wherein an alignment apparatus, for aligning ones of magnetic or magnetizable particles contained in an applied coating medium, is provided between the at least first printing unit and the rotatable cooling cylinder.

8. The printing press according to claim 1 , wherein the at least first electrode one of has a plurality of electrode tips spaced apart from one another as viewed transversely to a direction of the substrate travel path (T), and can be adjusted in terms of its distance from the substrate travel path, and is connected to a generator that supplies a voltage of at least 20 kV.

9. The printing press according to claim 1 , wherein one of a drying device and a curing device is located upstream of the rotatable cooling cylinder in the substrate travel path.

10. The printing press according to claim 9 , wherein the rotatable cooling cylinder and the one of the drying device and the curing device are one of included as part of a conditioning apparatus and are arranged in a common frame in the form of a conditioning apparatus embodied as a module and connecting an upstream conveyor line to an intake of the product receiving unit.

11. A method for producing one of products and intermediate products in a printing press including;
supplying a sheet-format substrate to be processed on an intake side of the printing press using a printing material infeed;
printing the sheet-format substrate in a printing unit of the printing press using one or more printing couples;
conveying the printed sheet-format substrate along a transport path over one of a cooled supporting and guiding surface of a guiding device and a transport device configured as a rotatable cooling cylinder to a product receiving unit, where the printed sheet-format substrate is combined to form product bundles;
charging the sheet-format substrate electrostatically using a first electrode directed toward, and spaced apart from a point on a section of the transport path that runs over an outer circumferential surface of the rotatable cooling cylinder;
assisting a positioning of the substrate on the one of the cooled supporting and guiding surface by electrostatic forces using the first electrode; and
providing an assistant substrate positioning device, the assistant substrate positioning device being different from the first electrode and being positioned upstream of the first electrode in the travel path at a maximum angle of 25°, as viewed in a circumferential direction of the rotatable cooling cylinder and;
using the assistant substrate positioning device, for physically positioning the substrate against the circumferential surface of the rotating cooling cylinder upstream of the first electrode.

12. The method according to claim 11 , including charging the substrate using the first electrode at a location that one of lies no more than 60° downstream of a point at which sheets of the substrate are picked up from an upstream conveyor device, as viewed in a production direction of rota

Assignees

• Koenig & Bauer Ag

Inventors

• Siemer Axel
• Endres Helmut
• Kohrmann Manfred
• Rauhofer Roman

Classifications

• B41F21/005

  Electrostatic holding down devices · CPC title

• B41F23/0483

  Drying combined with cooling · CPC title

• B41P2200/40

  Screen printing · CPC title

• B41F23/0479

  using chill rolls · CPC title

• B41F11/02 Primary

  for securities (security printing B41M3/14) · CPC title