GB979499A - Automatic control and actuator therefor - Google Patents

Abstract

979,499. Programmed control of industrial apparatus. JORDAN CONTROLS Inc. Aug. 30, 1963, No. 34388/63. Heading G3N. In a programmed control arrangement the programme is set up on a code-card 1 of highdensity polyethylene having finger 3 the length of which from a reference line 4 being proportional to a desired operating condition of the apparatus or process. The fingers are prepared by cutting the fingers with respect to a scale 5 and can be carried out by a punching device Fig. 2, not shown. The code-card is mounted in a carrier and aligned by holes 6. When pushed into a reading device edges 2 of the fingers 3 position a member 31, Figs. 8, 11. In Fig. 8, the member 31 positions a sliding contact 43 of a potentiometer 39 and a sliding contact 50 of a parallel-connected potentiometer 48 is positioned by a mechanical connection 51 from a load 47. The difference between the tapped potentials is fed to an energizing device 52 for the load 47 so as to cause a movement of the sliding contact 50 tending to reduce the potential difference to zero. In a modification, Fig. 12, not shown, the sliding contact engages a plurality of signal contacts connected to tappings on a resistor. In Fig. 11, a dependent coupling 59 engages a spring-tensioned wire 54 passing around pulleys 55-57. The pulley 57 drives a rotor of a selsyn generator 60 having a stator coupled to a stator of a selsyn generator 61, the rotor of which is positioned by an electro mechanical load 46 and is energized from an A.C. supply through leads 64. The output from the rotor of generator 60, representative of the difference between the programmed condition and the actual condition of the load 47, is fed to an amplifier and servo unit 66 connected to actuate the load 47.