DEVICE FOR TREATING SHEET-LIKE SUBSTRATES WITH LIGHT

• US 20110013170A1
• Filed: 07/09/2010
• Published: 01/20/2011
• Est. Priority Date: 07/14/2009
• Status: Active Grant

• Current Assignee: Gerhard Meyer
• Original Assignee: Gerhard Meyer
• Inventors: Meyer, Gerhard
• Granted Patent: US 8,091,891 B2
• Time in Patent Office: Days
• US Class Current: 355/72
• CPC Class Codes: B65H 2401/22 Optical properties, e.g. opacity or transparency
• CPC Class Codes: B65H 2404/25 Driving or guiding arrangements
• CPC Class Codes: B65H 2404/2691 Arrangement of successive belts forming a transport path
• CPC Class Codes: B65H 2553/42 Cameras
• CPC Class Codes: B65H 2553/80 Arangement of the sensing means
• CPC Class Codes: B65H 2701/1912 Banknotes, bills and cheques or the like
• CPC Class Codes: B65H 29/242 Suction bands or belts
• CPC Class Codes: B65H 29/52 Stationary guides or smoothers
• CPC Class Codes: B65H 5/224 by suction belts B65H11/005 takes precedence
• CPC Class Codes: G01N 21/89 in moving material, e.g. running paper or textiles G01N21/90, G01N21/91, G01N21/94 take precedence
• CPC Class Codes: G01N 33/34 Paper

Abstract

A device for treating sheet-like substrates with light is made for a suction table, which includes a circulating suction strip for transporting the sheet-like substrates, which suction strip forms a descending loop relative to its table-parallel transport level. The loop has a descending branch and, adjacent to the latter, an ascending branch. There is a gap for the passage of light between the descending branch and the ascending branch of the suction strip, which is bridged by a stationary bridging member which at least partially allows light to pass through it and whose surface is disposed at a level slightly recessed relative to the parallel transport level, so that a high degree of accuracy and trouble-free operation are ensured even at high transport speeds.

Claims

1. An apparatus for treating sheet-like substrates with light, comprising a suction table having a circulating suction strip for transporting the sheet-like substrates, the suction strip forms a descending loop relative to its table-parallel transport level, said loop comprising a descending branch and, adjacent to the latter, an ascending branch, with a gap for the passage of light between the descending branch and the ascending branch of the suction strip being bridged by a stationary bridging member which at least partially allows light to pass through it and whose surface is disposed at a level slightly recessed relative to the parallel transport level.

3. The apparatus for treating sheet-like substrates with light according to claim 1, wherein the recess of the surface of the bridging member relative to the transport level of the suction strip corresponds at least to the thickness of the sheet-like substrates.

4. The apparatus for treating sheet-like substrates with light according to claim 3, wherein the recess of the surface of the bridging member relative to the transport level of the suction strip is in the region of between 0.5 and 0.8 mm.

5. The apparatus for treating sheet-like substrates with light according to claim 1, wherein the recess of the surface of the bridging member relative to the transport level of the suction strip is adjustable.

6. The apparatus for treating sheet-like substrates with light according to claim 1, wherein the bridging member for the transmitted light check is provided with includes a transparent glass plate having a smooth surface.

7. The apparatus for treating sheet-like substrates with light according to claim 1, wherein the bridging member for laser treatment is a perforated plate with spacing cams projecting in an upward direction.

8. The apparatus for treating sheet-like substrates with light according to claim 1, wherein the suction strip is a spiral screen strip.

9. The apparatus for treating sheet-like substrates with light according to claim 1, wherein the suction table includes an evacuable box whose at least partially open upper side is passed over by the suction strip.

10. The apparatus for treating sheet-like substrates with light according to claim 6, wherein the transparent plate of the bridge member is received by a mounting frame.

11. The apparatus for treating sheet-like substrates with light according to claim 1, wherein the bridging member has bevelled lateral edges and is thus movable into contact with the adjacent deflection areas of the suction strip.

12. The apparatus for treating sheet-like substrates with light according to claim 1, wherein four deflection rollers, at the corners of a regular trapezium, are associated with the suction strip (4).

13. The apparatus for treating sheet-like substrates with light according to claim 10, wherein the lateral ends of the mounting frame are received by mounting brackets which are adjustably mountable on the side of the table.

2. (canceled)

14. The apparatus for treating sheet-like substrates with light according to claim 2, wherein on one side of the transparent plate of the bridge member provision is made for an illumination device, while on the other side thereof provision is made for a camera.

15. The apparatus for treating sheet-like substrates with light according to claim 14, wherein the illumination device contains at least one LED.

16. The apparatus for treating sheet-like substrates with light according to claim 14, whereby the camera is a line-camera spanning a table width.

17. (canceled)