GB1330747A - Computing device for accumulating the product of a first amount and a predetermined multiplier - Google Patents

Abstract

1330747 Computing cost of dispensed petrol VEEDER INDUSTRIES Inc 17 Aug 1971 [17 Aug 1970] 38496/71 Headings G4A and G4H A system for determining the total cost of dispensed petrol comprises switches 74 which are pre-set according to the cost per unit volume of petrol, a pulse generator 30 which provides a pulse for each unit volume of petrol dispensed and a register 36 for displaying the total cost of the petrol dispensed. The decimal cost per unit volume of the petrol is set up by push buttons 78 controlling number wheels 76 on each of the three switches 74. Each switch supplies a binary coded output via a respective gate 132, 134, 136 to a counter 130 to set flip-flops 137 to the complement of the binary coded output. On receipt of each pulse from the generator 30 a circuit 160 provides a sequence of three pulses each on a respective lead 162-164 to open the pairs of gates 136 and 156, 134 and 154, 132 and 152 in succession. A number of clock pulses corresponding to the number set up on each switch 74 in turn is therefore fed from an oscillator 140 to a counter 37 in the register 36. A gate 146 is closed by the output of a logic circuit 150 each time the counter reaches its maximum count on receipt of a number of pulses from the oscillator 140 equal to the number set up on each switch 74. Decimal digit indicators 47-50 display the total cost of the petrol dispensed.