Geometrical instruments – Straightedge type – Base attached
Patent
1980-07-18
1983-06-07
Martin, Jr., William D.
Geometrical instruments
Straightedge type
Base attached
33 1M, B43L 1302
Patent
active
043864708
ABSTRACT:
Drafting apparatus comprises a drafting head having X and Y scribing edges. The drafting head is mounted for movement along a beam in the Y direction and its position is detected by an encoder. The beam is mounted for movement in the Y direction relative to the drawing surface and its position is detected by another encoder. The encoders control a numerical display device indicating instantaneous X and Y displacements of the scribing edges from a datum set by a zeroing control. A scaling device is arranged operatively between the encoders and the numerical display device whereby the numerical display device will indicate the real values represented by proportional X and Y displacements. The drafting head is rotatably mounted from a carriage and a third encoder detects the angular position of the drafting head and controls the numerical display device to indicate the instantaneous angular position of the drafting head.
REFERENCES:
patent: 3742609 (1973-07-01), Jeannet et al.
patent: 3850043 (1974-11-01), Tarbox
patent: 3956588 (1976-05-01), Whetstone et al.
patent: 3958336 (1976-05-01), Denroche
patent: 4069588 (1978-01-01), Hoppe
patent: 4151649 (1979-05-01), Tatsuzawa
patent: 4221056 (1980-09-01), Koenuma
patent: 4237617 (1980-12-01), Goussios
patent: 4241512 (1980-12-01), Chikanobu et al.
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