Radiant energy – Photocells; circuits and apparatus – With circuit for evaluating a web – strand – strip – or sheet
Patent
1998-09-30
2000-08-29
Ham, Seungsook
Radiant energy
Photocells; circuits and apparatus
With circuit for evaluating a web, strand, strip, or sheet
25055946, 356429, G01N 2186
Patent
active
061112615
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a process and a device for the qualitative assessment of processed material.
DESCRIPTION OF THE PRIOR ART
U.S. Pat. No. 715,715 discloses a device for measuring the color of a material by means of an illumination device and a sensor for spectral analysis.
DE 41 23 916 A1 describes a device for detecting characteristics of an object. In this prior art device, the object is illuminated through a lens in such a way that the reflection angle condition is met for all points on a flat object surface.
EP 0 527 453 B1 discloses a device for the qualitative assessment of printed material by means of an illuminating device and a CCD camera.
The invention is based on the object of providing a process and a method for the qualitative assessment of processed material.
In accordance with the invention, this object is attained by providing a process and an apparatus for the qualitative assessment of processed material, such as printed materials. At least one illuminating device, one photoelectric sensor, and an evaluating device are used. The several components are arranged so that all image areas of the materials to be inspected reflect light beams almost completely onto the sensor. This may be accomplished by deforming the processed material or by breaking the light image of the material being inspected down into a plurality of pixels which can be analyzed individually.
It is possible in an advantageous manner by means of the process, or respectively the device of the present invention to detect reflecting areas in the material to be inspected.
The illuminating device of the device of the present invention is embodied in a space-saving manner by its V-shaped cross section. The extension of the illuminating device transversely to the transport direction of the material to be inspected is minimized in this way.
The length of the illuminating device in the longitudinal direction is also short, since the material to be inspected is very advantageously guided along a curved guide surface. Because of this curvature, the sheet to be inspected is additionally stabilized.
Because of shutters placed on the illuminating device, preferably only light beam directed to the reflecting areas are active, which are reflected almost totally by the reflecting areas of the material to be inspected into the CCD area camera.
By means of these embodiments of the illuminating device and the guide surface, scattered light effects, for example are reduced, and a directed beam path in the illuminating device is created.
BRIEF DESCRIPTION OF THE DRAWINGS
The device of the invention is represented in the drawings and will be described in greater detail in what follows.
Shown are in:
FIG. 1, a schematic lateral view of a device for the qualitative assessment of printed sheets,
FIG. 2, a schematic plan view of a device for the qualitative assessment in the transporting direction of the printed sheets,
FIG. 3, a schematic view from above on a suction box of the device for the qualitative assessment of printed sheets,
FIG. 4, a perspective plan view of the device.
DESCRIPTION OF THE INVENTION
A device, in accordance with the present invention, for the qualitative assessment of processed material 1 essentially consists of a guide 2, an illuminating device 3, at least one sensor 4 and a downstream connected evaluation device, as depicted in FIG. 1.
This quality control system can be employed for monitoring of both webs and sheets 1 in a rotary printing press or a machine for further processing. In the present preferred embodiment, the quality control system is employed in a sheet-fed rotary printing press for accomplishing the qualitative assessment of processed materials in the form of stocks and bonds, in particular for banknotes.
For example, sheets 1 to be inspected are conveyed by means of gripper systems 6 on a sheet transport level 7. These gripper systems 6 are fastened to circulating chains 8 of a chain conveyor, which is known per se. The guide 2 is arranged above the sheet trans
REFERENCES:
patent: 4532430 (1985-07-01), Ross et al.
patent: 4715715 (1987-12-01), Howarth et al.
Bolza-Schunemann Claus August
Schaede Johannes Georg
Ham Seungsook
Koenig & Bauer Aktiengesellschaft
Pyo Kevin
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