Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1988-03-08
1989-05-30
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
356401, G01N 2186
Patent
active
048354015
ABSTRACT:
An apparatus for automatic positioning a printing film such as a color separation film on a transparent base film having centering holes including a main base having a flat top surface on which a white T-shaped guidance mark is formed and centering pins. At first the base film is placed on the top surface of main table such that the centering pins are inserted into the centering holes, and then the printing film is placed on the base film such that right and left horizontal register marks and a vertical register mark formed on the printing film are roughly aligned with the T-shaped guidance mark. After measuring the distance from home position to the left and right register marks, one of two air pads is operated to move the printing film such that the horizontal register marks are brought in parallel with the line connecting the centers of centering pins. Then the printing film is moved forward to coincide the horizontal register marks with a line connecting the centers of centering pins. Next, the printing film is moved in the horizontal direction until the vertical register mark on the printing film is coincided with a perpendicular bisector with respect to the line connecting the centers of centering pins in such a way that the printing film is further moved leftward by a predetermined distance from the point at which the vertical register mark on the printing film is detected.
REFERENCES:
patent: 4496241 (1985-01-01), Mayer
patent: 4524280 (1985-06-01), Ishikawa
patent: 4641198 (1987-02-01), Ohta et al.
Nelms David C.
Shami Khaled
Yutaka Electric Company, Ltd.
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