Photogrammetric plotter and constraint free drive system therefo

Details Photogrammetric plotter and constraint free drive system therefo Photogrammetric plotter and constraint free drive system therefo

1979-02-16

1980-11-18

Shepperd, John W.

Geometrical instruments

Miscellaneous

Light direction

33 1M, 33 20D, 74 89, F16H 2702, G02B 2722

Patent

active

042337402

ABSTRACT:
A photogrammetric plotter having a photocarriage which is supported on a trolley carried by a first set of way bars which in turn are supported from the trolley element on a second set of way bars mounted on a base for viewing by binocular optical system of a pair of stereo photos on a pair of photo carriers on the photocarriage. A constraint free drive apparatus is provided for driving the photocarriage along each of the set of way bars each of constraint free drive apparatus including a drive rod supported, in a preferred embodiment on the trolley supporting the photocarriage, and at only one end of the drive rod is displaceable in a direction transverse of the longitudinal axis of the drive rod but not displaceable axially of the drive rod. A drive assembly constituted by V drive wheel and a servo motor driving the drive wheel engage the drive rod, and a clutch means constituted by a spring-solenoid controlled cam member permit the rapid engagement and disengagement of the drive rod with the drive wheel. Each photo carrier stage is supported on a set of way bars, the left stage being adjustable by a servo motor in the Y ordinate (Delta Y) and the right stage is adjustable by a servo motor in the X ordinate (Delta X).

REFERENCES:
patent: 1756062 (1930-04-01), Holst
patent: 1926828 (1933-09-01), Van Berkel
patent: 3434218 (1969-03-01), Potter
patent: 3519827 (1970-07-01), Chitnyal
patent: 3926062 (1975-12-01), Neff
patent: 3989933 (1976-11-01), Inghilleri
Pulfrich, Stereo-Komparator, Zeitschrift fur Instrumentenkunde, Mar. 1902, XXII, pp. 75-76.

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