Digitally controlled drafting machine

Details Digitally controlled drafting machine Digitally controlled drafting machine

1982-03-22

1984-01-24

Truhe, J. V.

Electricity: motive power systems

Positional servo systems

Program- or pattern-controlled systems

318603, 318565, 340686, H02P 706

Patent

active

044279329

ABSTRACT:
A drafting machine which employs two variable speed and one constant speed motors. A pencil is moved along both X- and Y-axes by means responsive to the speed differentials of the motors. Speeds of the motors are controlled by an electrical circuit having a plurality of off-on switches and a plurality of rocking switches. The latter load counters from a pulse generator into counters for straight line, circle, spiral and logarithmic spiral controls which control activation of resistors which govern the speeds of the two variable speed motors. Indicators indicate to the operator the direction in which the pencil is moving, the diameter of a circle being drawn, the increment (or decrement) of a spiral being drawn as compared with a circle and the increment (or decrement) of a logarithmic spiral being drawn as compared with a spiral.

REFERENCES:
patent: 3609315 (1971-09-01), Rogers
patent: 3619755 (1971-11-01), Munro et al.
patent: 4150328 (1979-04-01), Cannon
patent: 4204144 (1980-05-01), Hill
patent: 4255643 (1981-03-01), Balfanz
"X-Y Rotational Positioning System"-Cochran et al., IBM Disclosure-, vol. 14, No. 2-Jul. 1971, pp. 644-645.

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