Process for assessing the quality of processed material

Details Process for assessing the quality of processed material Process for assessing the quality of processed material

1998-10-01

2001-12-25

Boudreau, Leo (Department: 2721)

Image analysis

Applications

Document or print quality inspection

C382S100000, C250S576000

Reexamination Certificate

active

06333987

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to processes for qualitative assessment of processed material.
DESCRIPTION OF THE PRIOR ART
DE-OS 38 849 describes a process for detecting faults on rolled steel surfaces. In the process those faults, which have a defined periodicity, are identified.
DE 41 29 196 A1 discloses a process for detecting faults in a textile web. Here, the number of consecutive faults is added up. When a fault-free product appears, the counter setting is returned to zero.
SUMMARY OF THE INVENTION
It is the object of the present invention to provide a process for the qualitative assessment of processed material.
This object is attained in accordance with the invention by the utilization of a process for the qualitative assessment of material by utilization of at least one photoelectric sensor and an evaluation device which acts with it. Image areas of the inspected material are detected in association with possible fault sources. Each printing plate or forme on a printing cylinder which is provided with a plurality of identical printing formes that are arranged one behind the other is determined as the fault source.
Faults in the material to be inspected are systematically detected in an advantageous manner by means of the processes of the present invention. Locating a fault is made easier by means of the specific detection of occurring faults, and their assignment to an associated fault source. Waste and down-times of the processing machine are reduced.
In this way, a clear association of faults to the fault- generating printing forme is possible, in particular in connection with rotary printing presses (see EP 0 406 157 B1) having a printing cylinder with a plurality of identical printing formes.
A dependable fault assessment is achieved by counting up and down in accordance with the number of successive faulty and fault-free image areas.
In connection with faults because of insufficient wiping of the inked printing formes of a steel engraving printing press in particular, it often occurs that only one fault-free sheet follows several faulty sheets, and then is again followed by several faulty sheets. If, in this case, the number of faulty sheets has almost reached an upper threshold value, the counter setting is only reduced by one as a result of this single fault-free sheet, and the counter setting is increased again by the following faulty sheets. Therefore the threshold value of the counter setting is rapidly reached and a warning signal is triggered. Unnecessary waste is reduced by this.


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