Abstract

The invention relates to a device for aligning magnetic or magnetisable particles (P) which are contained in a coating agent (06) applied to a side of a strip-shaped or arcuate substrate (02), the device having a first aligning means (33; 33') which is arranged in the transport path of the substrate (02) to be conveyed and has a plurality of magnets (44) in the region of its side facing the transport path in order to align, in each case in a surface region having the coating agent (06), at least some of the particles (P) contained in the coating agent (06) in a defined manner in order to generate image information, wherein the magnets (44) of the first aligning means (33;33') which are used for the alignment and the substrate (02) which is supplied with the coating agent (06) containing the particles (P) move synchronously with one another at least on a portion of the transport path. At least one further aligning means (42; 43) which is attached to the frame on the transport path during operation and has a plurality of magnets (46; 47) which remain stationary in the device during operation is allocated in front of or opposite the first aligning means (33; 33') in the transport path of the substrate (02) to be conveyed. The invention further relates to a printing machine having such a device as well as to a method for aligning magnetic or magnetisable particles.

IPC Classes  ?

• B41F 11/02 - Rotary presses or machines having forme cylinders carrying a plurality of printing surfaces, or for performing letterpress, lithographic, or intaglio processes selectively or in combination for securities
• B42D 25/369 - Magnetised or magnetisable materials
• B42D 25/41 - Marking using electromagnetic radiation
• B41F 13/193 - Transfer cylinders; Offset cylinders
• B41F 19/00 - Apparatus or machines for carrying out printing operations combined with other operations
• B41F 23/00 - Devices for treating the surfaces of sheets, webs or other articles in connection with printing
• B41F 23/04 - Devices for treating the surfaces of sheets, webs or other articles in connection with printing by heat drying, by cooling, by applying powders
• B41M 3/14 - Security printing

Abstract

The invention relates to devices for aligning magnetic or magnetizable particles, which are contained in a coating means (06) applied on one side of a substrate (02), which is in the form of a web or sheet, having a magnet cylinder (33), which is arranged in the transport path of the substrate (02) to be conveyed and, in the region of the outer circumference thereof, has a plurality of devices (34) effecting a magnetic field, or magnet devices (34) for short, wherein some or all of the magnet devices (34) comprise a magnet (44) which is rotatable by an associated motor (46). The magnet cylinder (33) is rotatably arranged in frame walls (38; 39) of a frame, and at least one transducer (63) for contactless transfer of electrical energy and/or control signals from the outside is provided in or on the rotating magnet cylinder (33), which comprises a transducer part (64) fixed to the frame and a transducer part (66) fixed to the cylinder during operation.

IPC Classes  ?

• B41F 11/02 - Rotary presses or machines having forme cylinders carrying a plurality of printing surfaces, or for performing letterpress, lithographic, or intaglio processes selectively or in combination for securities
• B41F 19/00 - Apparatus or machines for carrying out printing operations combined with other operations