Cylinder, device and machine for aligning magnetic or magnetizable particles on a web-like or sheet-like substrate

Patent metadata

Field	Value
Publication number	US-10994302-B2
Application number	US-201917040735-A
Country	US
Kind code	B2
Filing date	Jan 15, 2019
Priority date	Apr 18, 2018
Publication date	May 4, 2021
Grant date	May 4, 2021

Abstract

A cylinder is usable, in particular, for aligning magnetic of magnetizable particles, which are contained in a coating medium that is applied to a first side of a web-like or a sheet-like substrate, which cylinder, in the region of its outer circumference, has a plurality of elements effecting a magnetic field, magnetic elements for short. The magnetic elements are arranged in or on a plurality of ring elements that are spaced axially apart from one another and that are positionable in the axial direction on a shaft, in or on which ring elements, in turn, a plurality of magnetic elements are respectively arranged one after the other in the circumferential direction. At least two adjacent ring elements, each have a covering element, forming a part of the cylindrical lateral surface of the cylinder and extending in the circumferential direction, at least over the circumferential region populated with magnetic elements. The covering elements of two ring elements adjacent to each other have, on their sides facing each other in the axial direction, a plurality of projections alternating in the circumferential direction with recesses and offset in a circumferential direction in such a way that, during a relative movement of the two ring elements towards each other, the projections on the covering element of one ring element engage, in the manner of teeth, in corresponding recesses of the other ring element, and, as seen in the circumferential direction, can overlap. A security paper printing machine, having such a cylinder, is also disclosed.

First claim

The invention claimed is:

1. A cylinder for aligning one of magnetic and magnetizable particles contained in a coating medium that is applied to a first side of one of a web-format and a sheet-format substrate, which cylinder has, in a region of its outer circumference, a plurality of magnetic elements;
wherein the plurality of magnetic elements are arranged one of in and on a plurality of ring elements, which plurality of ring elements are spaced apart from one another axially and are adjustably positionable in an axial direction on a shaft of the cylinder;
wherein one of in and on each of the plurality of ring elements a ones of the plurality of magnetic elements are arranged one after another in a circumferential direction of each one of the plurality of ring elements;
wherein at least two adjacent ones of the plurality of ring elements each have a cover element that forms a part of a cylindrical shell surface of the cylinder and that extends in the circumferential direction, at least over a circumferential region of each of the at least two adjacent ones of the plurality of ring elements that are equipped with the plurality of magnetic elements; and
wherein cover elements of first and second adjacent ones of the plurality of ring elements, on sides of the cover elements that face one another in the axial direction, each have a plurality of protrusions alternating in the circumferential direction with a plurality of recesses, which recesses and protrusions on the first one of the first and second adjacent ring elements are offset in the circumferential direction of the cylinder from corresponding recesses and protrusions on the second one of the first and second adjacent ring elements whereby, with a relative movement of the first and second ring elements toward one another, the protrusions on the cover element of the first adjacent ring element extend, in a tooth-like manner, into corresponding recesses of the second adjacent ring element and overlap one another, as viewed in the circumferential direction.

2. The cylinder according to claim 1 , wherein a number of the protrusions on one of the cover elements that are between the recesses on a second one of the cover elements corresponds to at least half of a number of the plurality of magnetic elements that are provided in the circumferential direction of the at least two adjacent ones of the plurality of ring elements.

3. The cylinder according to claim 1 , one of wherein one of four to six of the plurality of ring elements are arranged in the axial direction and two to ten of the plurality of magnetic elements are arranged on each of the plurality of ring elements in the circumferential direction, and wherein the plurality of magnetic elements arranged one of in and on each of the plurality of the ring elements are positionable in the circumferential direction.

4. The cylinder according to claim 1 , wherein each of the plurality of ring elements has a cover element having, on the sides thereof that face one another in pairs, the plurality of recesses and protrusions which are offset in the circumferential direction.

5. The cylinder according to claim 1 , wherein the axially facing edges of the recesses and protrusions on each of the cover elements on the at least two adjacent ones of the plurality of ring elements extend in a wavelike manner in the circumferential direction.

6. The cylinder according to claim 1 , wherein an interruption in a lateral surface of the cylinder is located between the cover elements of the at least two adjacent ones of the plurality of ring elements, as viewed in the axial direction of the cylinder.

7. A device for aligning one of magnetic and magnetizable particles contained in a coating medium that is applied to a first side of one of a web-format and a sheet-format substrate, said device comprising a cylinder arranged in the transport path and wherein the cylinder is embodied as a magnetic cylinder according to claim 1 .

8. The device according to claim 7 , wherein an additional cylinder is provided, the additional cylinder being arranged in a transport path of the substrate to be conveyed and being embodied as a magnetic cylinder according to claim 1 .

9. The device according to claim 8 , wherein one of a drying unit and a curing unit is arranged on the transport path between a point at which the substrate runs onto the magnetic cylinder and a point at which the substrate runs onto the additional cylinder.

10. A machine for producing optically variable image elements on a substrate, the machine comprising;
a printing substrate infeed embodied as a sheet feeder;
at least one printing unit having at least one printing couple, by the use of which at least one printing couple the printing substrate that is guided along a transport path through the machine one of is and can be printed at least on a first side;
a product receiving unit, embodied as a pile delivery; and
a device for aligning one of the magnetic and the magnetizable particles contained in the coating medium according to claim 7 , the device being provided in the transport path of the substrate between the at least one printing unit and the product receiving unit.

Assignees

• Koenig & Bauer Ag

Inventors

• Kriege Björn
• Kreps Edwin
• Kneitz Anja

Classifications

• B65H2404/191

  magnetic · CPC title

• B05D5/065

  having colour interferences or colour shifts or opalescent looking, flip-flop, two tones · CPC title

• B41F23/0453

  by ultraviolet dryers · CPC title

• B41F23/0409

  Ultraviolet dryers · CPC title

• B41F15/0809 Primary

  with cylindrical or belt-like screens · CPC title