Device for aligning magnetic or magnetizable particles and machine for generating optically variable image elements

Patent metadata

Field	Value
Publication number	US-11919290-B2
Application number	US-202218278032-A
Country	US
Kind code	B2
Filing date	Mar 31, 2022
Priority date	Apr 28, 2021
Publication date	Mar 5, 2024
Grant date	Mar 5, 2024

Abstract

Magnetic or magnetizable particles contained in a coating agent can be aligned using a device that includes a cylinder having a plurality of magnetic elements around its outer circumference. The magnetic elements are arranged in a matrix having columns extending in the circumferential direction and rows extending in an axially parallel manner. The magnetic elements in some columns are mounted as a group on a shared carrier element, and have a variable axial position collectively as a group and independently of the magnetic elements of an adjoining column. In these columns, at least one of the magnetic elements is arranged on the carrier element of a multi-piece cylinder body of the cylinder so as to be adjustable in the axial direction, by way of a mechanical adjusting means, and independently of at least one further magnetic element of the same column which is mounted on the same carrier element.

First claim

The invention claimed is:

1. A device for aligning magnetic or magnetizable particles (P) contained in a coating agent ( 06 ), comprising a cylinder ( 26 ), which comprises a number of n×m (in words: n times m, where n, m 0 ┐) elements ( 24 ) providing magnetic fields, magnetic elements ( 24 ) for short, in the region of its outer circumference in a matrix-like manner, which are arranged one behind the other in m columns extending in the circumferential direction of the cylinder ( 26 ) and next to one another in n rows extending in an axially parallel manner, in several of the columns of magnetic elements ( 24 ) arranged one behind the other in the circumferential direction in each case the magnetic elements ( 24 ) of these columns being mounted as a group at or on a shared carrier element ( 31 ) and being variable with respect to their axial position in or at the cylinder ( 26 ) by way of the carrier element ( 31 ), collectively as a group and independently of the magnetic elements ( 24 ) of an adjoining column, and, in these columns, in each case at least one of the magnetic elements ( 24 ) being arranged and/or mounted on the carrier element ( 31 ) of a multi-piece cylinder body ( 29 ) of the cylinder ( 26 ) so as to be adjustable in the axial direction, by way of mechanical adjusting means ( 42 , 43 , 44 ) comprising a gearbox, independently of at least one further magnetic element ( 24 ) of the same column which is mounted on the same carrier element ( 31 ).

2. The device according to claim 1 , characterized in that the magnetic elements ( 24 ) can be positioned at the relevant carrier element ( 31 ) in the circumferential direction and/or can be completely removed from the cylinder ( 26 ).

3. The device according to claim 1 , characterized in that, in all columns, the magnetic elements ( 24 ) of the column are arranged as a group at the same carrier element ( 31 ) and can be axially adjusted independently in each case of multiple or all other magnetic elements ( 24 ) of the same group.

4. The device according to claim 1 , characterized in that the carrier elements ( 31 ) are arranged on a shaft encompassed by the cylinder ( 26 ).

5. The device according to claim 1 characterized in that the carrier elements ( 31 ) of all or at least of the two groups of magnetic elements ( 24 ) of at least three groups that are closest to the end face are mounted so as to be axially adjustable in or at the cylinder ( 26 ) and/or on a shaft encompassed by the cylinder ( 26 ), independently of the other carrier elements ( 31 ).

6. The device according to claim 1 , characterized in that the adjusting means ( 42 , 43 , 44 ) comprise a gearbox converting a rotational movement into a linear movement and/or a screw drive.

7. The device according to claim 6 , characterized in that a stop means limiting the axial movement of the magnetic element ( 24 ) is provided, whose stop surface limiting the axial position can be varied by way of the screw drive.

8. The device according to claim 7 , characterized in that the stop means is formed by one end of a threaded shaft or of an attachment continuing the same, the threaded shaft engaging in an internal thread provided at the magnetic element ( 24 ) or at a mount ( 28 ) encompassed thereby, and the end of the threaded shaft ( 42 ) or of the attachment being supported in the axial direction against a portion of the cylinder body ( 29 ) which is fixed to the cylinder.

9. The device according to claim 8 , characterized in that the stop means is formed by a screw head of an adjusting screw ( 42 ) encompassing the threaded shaft.

10. The device according to claim 8 , characterized in that the magnetic element ( 24 ) is preloaded by an axially acting force in the direction of the bearing surface of the stop means by way of a means ( 44 ) that applies a force to the magnetic element ( 24 ).

11. The device according to claim 1 characterized in that the magnetic element ( 24 ) or a mount ( 28 ) encompassed thereby comprises fastening means ( 39 , 41 , 46 ), by way of which the magnetic element ( 24 ) or its mount ( 28 ) can be fixed to the carrier element ( 31 ) and, for the purpose of an axial adjustment of the magnetic element ( 24 ), can be detached at least to such an extent that the magnetic element ( 24 ) can be axially moved relative to the carrier element ( 31 ) at least within an adjustment range.

12. The device according to claim 11 , characterized in that a clamping connection ( 39 , 41 , 46 ) is provided between the respective magnetic element ( 24 ) and the carrier element ( 31 ), serving as the fastening means ( 39 , 41 , 46 ) for the magnetic elements ( 24 ), the magnetic element ( 24 ) or a mount ( 28 ) carrying the same being connected by way of a web ( 47 ) extending the radial direction to a vertically movable clamping element ( 41 ), which can be tightened by a clamping drive ( 39 ) from the cylinder interior on both sides against a brace ( 46 ) that is provided on both sides of the web ( 47 ) and that is fixed to the cylinder body and/or is fixed to the carrier element.

13. The device according to claim 1 , characterized in that the respective axially adjustable magnetic element ( 24 ) in or at a mount ( 28 ) is arranged detachably on or in the carrier element ( 31 ) and, together with the mount ( 28 ), can be axially adjusted at the carrier element ( 31 ) and/or positioned in the circumferential direction.

14. A machine ( 01 ) for generating optically variable image elements ( 03 ) on printing substrate sections ( 02 ), comprising a printing substrate infeed ( 13 ), at least one printing unit ( 04 ) comprising at least one printing mechanism ( 11 ; 12 ), by which printing substrate sections ( 02 ) guided on a transport path through the machine are printed and/or can be printed at least on a first side with multiple-ups ( 09 ) of a number of columns and a number of rows in a matrix-like manner, a product receiving system ( 22 ), by which processed printing substrate sections ( 02 ) can be combined into bundles, and a device ( 07 ) for aligning magnetic or magnetizable particles (P) according to claim 1 , which is provided in the transport path of the printing substrate sections ( 02 ) between the printing unit ( 04 ) and the product receiving system ( 22 ).

15. The machine according to claim 14 , characterized in that the cylinder ( 26 ) comprises a number m of groups including magnetic elements ( 24 ) which corresponds the number of columns of multiple-ups ( 09 ) and/or a number n of magnetic elements ( 24 ) arranged, in each group, one behind the other in the circumferential direction which corresponds to the number of rows of multiple-ups ( 09 ) per printing substrate section ( 02 ).

Assignees

• Koenig & Bauer Ag

Inventors

• Beck Eugen
• Kreps Edwin
• Kriege Björn

Classifications

• B41F27/02 Primary

  Magnetic devices · CPC title

• B41F13/10

  Forme cylinders · CPC title

• B41F13/20

  Supports for bearings or supports for forme, offset, or impression cylinders · CPC title

• B41F19/005

  with means for applying metallic, conductive or chargeable material · CPC title

• G03G19/00

  Processes using magnetic patterns; Apparatus therefor {, i.e. magnetography} · CPC title