Optics: measuring and testing – By configuration comparison – With photosensitive film or plate
Patent
1991-12-05
1993-05-25
Evans, F. L.
Optics: measuring and testing
By configuration comparison
With photosensitive film or plate
250560, 356385, 358107, G01B 1102
Patent
active
052144909
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
This invention relates to a system for measuring dimensions of sheets moving on a transferring line and also relates to a sheet dimension measurement system enabling the inspection of dimensions and shapes of sheets.
2. Background Technologies
At production lines that cut off belt-form paper, corrugated, aluminum sheets, copper sheets, steel sheets and the like to produce rectangular sheets, it is conventionally carried out by hands to inspect whether or not dimensions and shapes of cut sheets are within their standards.
For example, persons measure, by their hands, dimensions of several sheets after cutting off, or inspect irregularity of cutting surfaces of sheets, during cutting process or after cutting, by touching cutting surfaces by hands or visually, using a sheet being within standard as standard, in order to inspect cutting accuracies.
When accurate cutting dimensions are required, persons measure lengths, widths, and diagonal dimensions of every sheet with measure.
Because the aforementioned conventional method relies on man-power, it has such disadvantages that inspections take longer time and furthermore involve dangers.
DISCLOSURE OF THE INVENTION
It is an object of this invention to provide a sheet dimension measurement system to measure dimensions of all sheets being transferred on a transferring line.
It is another object of this invention to provide a sheet dimension measurement system enabling the performance not only of measurement of sheet dimensions but also inspection of sheet shapes.
The sheet dimension measurement system of the first invention comprises: sheets, so as to keep one of four sheet corners within a field of view of a corresponding one of the cameras with each corner being kept within a field of view of a corresponding one of the cameras and to be movable in accordance with sheet dimensions. optical axis of each of the cameras, so as to produce shadows of four sheet corners for the cameras and to be movable interlocking with the cameras. of sheet corners based on differences in brightness of standstill pictures taken by the cameras, and diagonal dimensions of sheets based on the detected absolute coordinates of four sheet corners.
The sheet dimension measurement system of the second invention comprises: A sheet dimension measurement system, comprising: transferring sheets, so as to keep one of four sheet corners within a field of veiw of a corresponding one of the first cameras with each corner being kept within a field of view of a corresponding one of the cameras and to be movable in accordance with sheet dimensions. sides within a field of view of a corresponding one of the second cameras with each side being kept within a field of view of a corresponding one of the cameras and to be movable in accordance with sheet dimensions, an optical axis of each of the second cameras, so as to produce shadows of four sheet corners for the first cameras and to be movable interlocking with the first cameras, against an optical axis of each of the second cameras, so as to produce shadows of four sheet sides for the second cameras and to be movable interlocking with the second cameras, of four sheet corners based on differences in brightness of standstill pictures of four sheet corners taken by the first cameras, of centers of four sheet sides based on differences in brightness of standstill pictures of four sheet sides taken by the second cameras, diagonal dimensions of sheets based on the detected absolute coordinates of sheets corners, and detected absolute coordinates of sheet corners and sheet side centers.
BRIEF DESCRIPTION OF DRAWINS
FIGS. 1A and 1B are plan and side view of the sheet dimension measurement system of the first invention.
FIG. 2 shows the overall system construction of the embodiment shown in FIG. 1.
FIG. 3 is a functional block diagram of video data processing unit.
FIGS. 4A, 4B and 4C are drawings illustrating the algorithm to obtain absolute coordinates of sheet corners.
FIGS. 5 and 6 are drawings illustrating the algorit
REFERENCES:
patent: 4301373 (1981-11-01), Sjodin
Abe Norihiro
Miyagawa Tatsuyuki
Evans F. L.
Reliance Electric Ltd.
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