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 Title: |
US5598006:
Installation for quality control of printed sheets, especially security paperINSTALLATION FOR QUALITY CONTROL OF PRINTED SHEETS, ESPECIALLY SECURITY PAPER
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Stringa, Luigi; Trento, Italy
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| Assignee: |
De La Rue Giori S.A., Lausanne, Switzerland
other patents from DE LA RUE GIORI S.A. (139935) (approx. 115)
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| Published / Filed: |
1997-01-28
/ 1995-01-19
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| Application Number: |
US1995000374889
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| IPC Code: |
Advanced:
B42D 15/00;
G01N 21/89;
G01N 21/892;
G06T 1/00;
G07D 7/06;
G07D 7/12;
Core:
G01N 21/88;
G07D 7/00;
more...
IPC-7:
G01N 21/88;
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| ECLA Code: |
G07D7/12;
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| U.S. Class: |
Current:
250/559.46;
250/556;
356/071;
356/430;
Original:
250/559.46;
250/556;
356/071;
356/430;
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| Field of Search: |
250/556,559.45,559.46
356/445,429,430,71
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| Priority Number: |
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| Abstract: |
The installation for quality control of printed sheets (1) comprises means (8-13) for transferring said sheets, and cameras (2, 4, 6) for checking the print quality. The transfer means (8-13) are designed to transport the sheets in a plane and to allow the print quality of each of the faces of the sheet to be checked as well as a quality check using transparency to be carried out in succession and in a single pass. The means for checking each face are two cameras (2, 3) located on either side of said plane at two offset locations, the transfer means being designed to leave an open window at the side of each camera. A third camera (6) carries out the check using transparency.
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| Attorney, Agent or Firm: |
Kane, Dalsimer, Sullivan, Kurucz, Levy, Eisele and Richard, LLP ;
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| Primary / Asst. Examiners: |
Westin, Edward P.; Calogero, Stephen
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| INPADOC Legal Status: |
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Family Legal Status Report
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| Designated Country: |
AT CH DE FR GB IT LI SE
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| Family: |
Show 19 known family members
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First Claim:
Show all 7 claims |
I claim:
1. An installation for quality control of printed sheets including security paper, each having a top and bottom face comprising means for transferring said sheets and means for checking the print quality of each sheet, said means for transferring being constructed to transport said sheets in a plane to permit said means for checking to check on the print quality of each of the faces of the sheet in a single pass, the means for checking comprises:
- first and second cameras (2, 3; 22, 23) located on opposite sides of said plane respectively at two offset locations along said plane, said first and second cameras being used to check the print quality of the top and bottom faces of a check using reflection, the means for transferring having an open window adjacent a front of each camera to allow said first said second cameras to check the quality of the corresponding front and bottom faces using reflection while the sheet (1; 21) is kept flat facing said camera (2, 3; 22, 23); and
- a third camera (6; 26) for checking the print quality of the sheet using transparency, the means for transferring having a slit (18, 19) facing the third camera (6; 26),
- wherein the means for transferring comprises a plurality of superposed conveyor belt devices (8, 9, 10, 11, 12, 13; 8', 9', 10') between which the sheets (1; 1') travel, said plurality of conveyor belts include first and second conveyor belts (8, 10; 10') that extend over a length corresponding to a length of the windows adjacent said first and second cameras,
- said means for transferring (8, 10; 28, 31; 8') holding the sheet by suction being equipped with holes (50) having an axis which is inclined relative to the transport plane,
- wherein said installation further comprising suction means for holding the sheet (1;1') flat against said first and second conveyor belts and facing said cameras, said installation further comprising a pair of superimposed plates (16, 17) positioned in front of said third camera (6) for keeping the sheet (1) to be checked flat, said plates having a slit (18, 19) for the checking the print quality by transparency, said slit being arranged perpendicularly to the direction of travel of the sheets,
- wherein said first, second and third cameras (2, 3, 6; 22, 23, 2) being linear array cameras and wherein the window adjacent to the side of each camera (2, 3; 22, 23) having a length corresponding to a fraction of the length of the sheet (1, 21) to be checked.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 14 U.S. patent(s) that reference this one
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