Gretag Aktiengesellschaft

Fortunat Schrammli

Markus Berner

Hans Ott

Wilhelm H Koch

Lido Feri

A manual densitometer for measuring the color composition of an original has a housing which includes a unit for measuring the original, a unit for controlling the measuring, as well as an evaluating electronics and display unit which displays selected variables and parameters. In addition, it has a control unit with a manually-operated dial, which can be rotated from outside the housing, whereby the measuring, the measurement variables, and the parameters for the measurement can be selected by rotating the dial.

Manual densitometer with manully operated dial

A manual device for the detection of photometric values on a printed product comprises a measuring head extruding from a housing into a measuring position. The measuring head is mounted together with its optical components on a measuring carriage, which may be displaced along the bottom of the housing by means of a drive motor between a rest position and a measuring position. The drive motor drives via a gear, a drive pulley and a grid axle for a monochromator. A sliding gear and a locking device are coordinated with the drive pulley, with the locking device immobilizing the measuring carriage precisely in the measuring position. The drive motor serves to displace the measuring carriage until the locking process essentially begins; and after this process, serves to rotate the grid axle.

Manual device for the determination or measurement of photometric data

A manual device for the detection of photometric data which includes a measuring head to illuminate a measuring surface and to detect the light reflected. The measuring light captured by the measuring head is spectrally decomposed by a monochromator containing a diffraction grating. The intensity of the light exiting through an outlet diaphragm is detected by a photodetector. The spectral position of the measuring light is set by a drive motor rotating a grating shaft connected with the holder of the diffraction grating. From the spectra detected, densitometric and colorimetric data are calculated by a computer, which together with the spectra determined, may be displayed on a display field.

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Hausen, Switzerland

Fortunat Schrammli