Optics: measuring and testing – By alignment in lateral direction – With light detector
Patent
1983-01-28
1986-06-24
Rosenberger, R. A.
Optics: measuring and testing
By alignment in lateral direction
With light detector
101DIG25, 356 73, 356444, B41F 1324
Patent
active
045964688
ABSTRACT:
An apparatus and method for automatically checking and correcting register adjustment of a multi-color sheet-fed printing press wherein register marks are read by an ink densitometer on a remote control desk. The densitometer head is mounted on an X,Y positioning mechanism under the control of a register control computer so that the densitometer head scans cross-shaped register marks to determine both axial and peripheral register error. Preferably both right-hand and left-hand marks are used in order to pecisely determine skew or diagonal error, and the densitometer head rapidly traverses from one mark to the other mark. Preferably each register mark is made up of offset component marks of the primary colors and the positions of the marks are matched with their respective colors by the time sequence of scan path points of intersection. One color is chosen as a reference from which desired positions are calculated for the other component marks. The deviations are displayed to the operator and used as control values.
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Heidelberg Offset CPC Brochure Published at Dupra, Jun. 3-16, 1977.
Der Polygraph (MAVO Article), 10/22/75, pp. 1393-1400 (translation included).
M.A.N.--Roland Druckmaschinen Aktiengesellschaft
Rosenberger R. A.
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