Image analysis – Applications – Document or print quality inspection
Reexamination Certificate
1998-02-17
2001-02-20
Johns, Andrew W. (Department: 2621)
Image analysis
Applications
Document or print quality inspection
C101SDIG029
Reexamination Certificate
active
06192140
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a method and a device for the qualitative assessment of processed sheets.
DESCRIPTION OF THE PRIOR
DE 32 20 098 C2 describes a numbering machine with a device for the qualitative assessment, by means of two testing cylinders, of the front and reverse sides of sheets to be numbered.
It is a limitation of this prior art device that no guide elements for holding the sheets on the testing cylinders are provided.
DE 42 23 555 A1 discloses a drum for transporting sheets in a reversing device of a sheet-fed rotary printing press. This drum is provided with grippers for gripping the front edge of the sheets, and with displaceable suction elements for stretching the rear edge of the sheet tight.
SUMMARY OF THE INVENTION
It is the object of the present invention to create a method and a device for the qualitative assessment of processed sheets.
This object is attained in accordance with the present invention by providing at least one drum which receives the sheet to be inspected. This drum passes the sheet by an image recording device, and is provided with a first holding device that grips the leading end of the sheet. At least one second holding device is also provided on the drum and holds the trailing end of the sheet. The two holding devices stretch the sheet tightly both circumferentially and axially on the surface of the drum prior to the inspection of the sheet. Once the sheet has been gripped and stretched, one page on the sheet can be inspected.
By means of the method or the device in accordance with the present invention, it is possible in an advantageous manner to prevent false measurements because of sheets having creases or being dished or otherwise deformed. The dependability of the image inspection is considerably increased, in particular in case of sheets having creases.
The arrangement of two drums, both of which have two holding devices for stretching the sheets tight, in particular makes a dependable inspection of the front and reverse sides of the sheets after their processing is finished possible.
REFERENCES:
patent: 4448121 (1984-05-01), Uno et al.
patent: 5086698 (1992-02-01), Wirz
patent: 5186107 (1993-02-01), Wieland
patent: 5241907 (1993-09-01), Dörsam et al.
patent: 5317390 (1994-05-01), Bolza-Schunemann et al.
patent: 5471309 (1995-11-01), Bolza-Schünemann
patent: 32 020 098 (1982-12-01), None
patent: 42 23 555 (1993-02-01), None
patent: 42 06 366 (1993-02-01), None
patent: 42 17 942 (1993-12-01), None
patent: 44 36 583 (1996-04-01), None
patent: 0 317 665 (1989-05-01), None
patent: 0 576 824 (1994-01-01), None
English Translation of DE 44 36 583 to Butcher, Apr. 1996.
Reinhard Gerald Josef
Schaede Johannes Georg
Johns Andrew W.
Jones Tullar & Cooper PC
Koenig & Bauer--Albert Aktiengesellschaft
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