Devices for aligning magnetic or magnetizable particles, machine, and method for producing optically variable image elements

Patent metadata

Field	Value
Publication number	US-11072164-B2
Application number	US-201917045818-A
Country	US
Kind code	B2
Filing date	May 17, 2019
Priority date	Jul 25, 2018
Publication date	Jul 27, 2021
Grant date	Jul 27, 2021

Abstract

Devices are provided for aligning magnetic or magnetizable particles, which particles are contained in a coating that is applied on one side of a substrate, which substrate is in the form of a web or sheet. The device has a magnet cylinder, which is arranged in a transport path of the substrate to be conveyed and, in a region of the outer circumference of the magnet cylinder, the device has a plurality of devices for effecting a magnetic field, or magnet devices for short. Some or all of the magnet devices comprise a magnet which is rotatable by an associated motor. The magnet cylinder is rotatably arranged in frame walls of a frame. At least one transducer for contactless transfer of electrical energy or control signals from the outside is provided in or on the rotating magnet cylinder, which comprises a first transducer part fixed to the frame and a second transducer part fixed to the cylinder during operation.

First claim

The invention claimed is:

1. A device for aligning one of magnetic and magnetizable particles that are contained in a coating medium that is applied to one side of one of a web-format and a sheet-format substrate comprising:
a magnetic cylinder, which is arranged in a transport path of the substrate to be conveyed and which magnetic cylinder has, in a region of an outer circumference of the magnetic cylinder, a plurality of magnetic devices that induce a magnetic field;
wherein at least some of the magnetic devices each comprise a magnet that is rotatable by an associated motor;
wherein the magnetic cylinder is arranged rotatably in frame walls of a frame;
wherein at least one transducer is provided for contactless transmission of one of electric energy and of control signals from an outside of the magnetic cylinder one of into and onto the magnetic cylinder, the transducer comprising a first transducer part that is fixed to the frame and a second transducer part that is fixed to the magnetic cylinder during operation;
wherein a bus system is provided for the contactless transmission of signals to the second transducer part that is fixed to the magnetic cylinder; and
one of wherein the second transducer part, that is fixed to the magnetic cylinder during operation, is arranged on a shaft segment that remains in the frame when the magnetic cylinder is removed from the frame, and, that, for operation, the shaft segment can be connected for conjoint rotation to a cylinder journal of the magnetic cylinder, and wherein the first transducer part that is fixed to the frame is arranged, at least Partially, in a recess in the frame wall such that the first transducer part at least dips into a plane of the frame on an interior side of the frame.

2. The device according to claim 1 , one of wherein the transducer is embodied as an electromagnetic coupler and wherein the first and second transducer parts are configured as ring-shaped, each being arranged concentrically around an axis of rotation of the magnetic cylinder, and wherein the first and second transducer parts are arranged axially adjacent to one another and are configured without mutual penetration in an axial direction of the magnetic cylinder with regard to ones of their coils and conductor loops that are involved in the transmission of signals.

3. The device according to claim 2 , wherein, for bidirectional signals transmission, a coupler is embodied as having a first transmission channel for transmitting one of control signals and control parameters to the magnetic cylinder and a second transmission channel for transmitting signals from the magnetic cylinder.

4. The device according to claim 1 , one of wherein both electric energy and control signals can be transmitted via the transducer and wherein the transducer is configured for bidirectional signals transmission.

5. The device according to claim 1 , wherein the magnetic cylinder is mounted rotatably in the frame walls, on two cylinder journals that protrude beyond a cylinder barrel of the magnetic cylinder at end faces thereof, whereby the magnetic cylinder can be removed, including the two cylinder journals, from the frame.

6. The device according to claim 1 , wherein the bus system is provided for transmission of signals from an external controller on at least a last segment to a first data logic system comprised by the first transducer part that is fixed to the frame, for the contactless transmission to a second data logic system comprised by the second transducer part that is fixed to the cylinder, and from the second transducer part that is fixed to the cylinder to one of a control logic system of motor controllers and to a central control assembly of the associated motors for the at least some of the magnetic devices that each comprise a magnet that is rotatable by an associated motor.

7. The device according to claim 1 , wherein at least at one end face of the magnetic cylinder a rotary feedthrough is provided, via which rotary feedthrough a line leading into the magnetic cylinder at the at least one end face thereof can be connected to a vacuum source.

8. The device according to claim 1 , wherein at least some of the plurality of magnetic devices one of are and can be arranged on the magnetic cylinder such that at least some of the plurality of magnetic devices are positionable in a circumferential direction of the magnetic cylinder.

9. The device according to claim 8 , wherein an assembly for transmitting one of electric power and signals to the plurality of magnetic devices is provided such that an electrical line connection between line branches, which are routed in the magnetic cylinder, and the motor and a motor controller for controlling the motor is maintained even with a displacement of the plurality of magnetic devices in the circumferential direction.

10. The device according to claim 8 , wherein on at least some of the magnetic devices to be operated, electrical connector elements are provided, which can be placed in electrically conductive contact with ends of line branches that transmit one of electric power and electrical control signals and are configured as having excess length, and via which the one of electric power and the electrical control signals can be supplied to a relevant one of the plurality of magnetic devices.

11. The device according to claim 10 , wherein the connector elements of the plurality of magnetic devices are provided on a supporting element, wherein a part of the plurality of magnetic devices that comprises the magnets, and the motor that rotates the magnets one of is and can be detachably mounted one of on and in the supporting element.

12. The device according to claim 1 , wherein a UV dryer is directed toward the transport path of the substrate, toward a point in a section of the transport path that leads over the magnetic cylinder.

13. A machine for producing optically variable image elements on a substrate, comprising;
a printing substrate infeed;
at least one printing unit having at least one printing couple, by the use of which at least one printing couple, substrate that is guided along a transport path through the machine one of and can be printed at least on a first side
a product receiving unit for receiving the substrate treated in the machine, and;
a device for aligning ones of magnetic and magnetizable particles, according to claim 1 , and being provided in the transport path of the substrate between the at least one printing unit and the product receiving unit, wherein the magnetic cylinder is mounted rotatably in the frame walls on two cylinder journals, which protrude beyond a cylinder barrel of the magnetic cylinder, at end faces thereof, A whereby the magnetic cylinder can be removed, along with cylinder journals from the frame walls.

14. The machine according to claim 13 , whereby, as an image-producing cylinder, the printing couple comprises a forme cylinder having, on a circumference of the forme cylinder, a multiplicity of image-producing ones of print motifs and groups of image-producing print motifs, which are arranged in multiple columns that are spaced equidistant from one another transversely to a direction of transport over a circumferential length that corresponds to a length of a print image, and in multiple rows that are spaced equidistant from one another in the direction of transport over a cylinder width that corresponds to a width of the print image.

Assignees

• Koenig & Bauer Ag

Inventors

• Jantsch Andreas
• Kreps Edwin
• Scheller Michael

Classifications

• B41F11/02

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

• B41F19/005 Primary

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

• B41F23/0409

  Ultraviolet dryers · CPC title

• B41F23/0453

  by ultraviolet dryers · CPC title

• B41P2213/91

  for sheet printing presses · CPC title