Geometrical instruments – Miscellaneous – Light direction
Patent
1985-10-11
1987-05-12
Stearns, Richard R.
Geometrical instruments
Miscellaneous
Light direction
250231SE, G01D 536
Patent
active
046638512
ABSTRACT:
A position measuring instrument comprising a graduation unit and a scanning unit. The graduation unit comprises a centering flange, a graduation carrier and a measuring graduation located on the graduation carrier. The scanning unit comprises a scanning component which comprises a scanning graduation and a stop. During assembly, the scanning unit is positioned radially with respect to the graduation carrier by positioning the stop against the centering flange. The scanning component may then be moved along a guide towards the measuring graduation. As the scanning component is moved towards the measuring graduation the stop no longer contacts the centering flange. A spacing foil removably sandwiched between the measuring graduation and the scanning graduation is used to position the scanning graduation at a predetermined distance from the measuring graduation. A locking means is then used to prevent further movement of the scanning component along the guide.
REFERENCES:
patent: 3894232 (1975-07-01), Laspesa
patent: 3900732 (1975-08-01), Costales
patent: 4031441 (1977-06-01), Garrett
patent: 4338517 (1982-07-01), Perrine
patent: 4342909 (1982-08-01), Accattino
patent: 4345149 (1982-08-01), Blaser
patent: 4475034 (1984-10-01), Maddox et al.
patent: 4512184 (1985-04-01), Ernst et al.
Verf. Dipl.-Phys. F. Hock, Fotoelektrische Winkel- und Wegschrittgeber, Oct. 1961.
Neuere Entwicklungen bei fotoelektrischen Langenmessgeraten, Jun. 1974, pp. 371-374.
Geratehandbuch Fur Einbau-Winkelmesseinrichtung (19384 Striche).
Dr. Johannes Heidenhain GmbH
Stearns Richard R.
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