Patent GB-1076021-A (GB)
Title: Sterling/decimal/sterling converter
Inventor: LIEBER HEINZ
IPC: H03M7/08
Filed: 1964-02-21
Abstract: 1,076,021. Sterling-decimal-sterling converters. OFFICE & ELECTRONIC MACHINES Ltd. May 18, 1965 [Feb. 21, 1964], No. 7318/64. Headings G4A and G4H. A converter connected between the input unit and calculator of a calculating machine is adapted to convert sterling into decimal form for the required calculations to be carried out and on completion of the calculations to convert the result back to its sterling value. Conversion to decimal value.-Impulses corresponding to the digits representing the pounds are transmitted directly over input lines (11- 22, Fig. 1A, not shown) to the calculator. When a space for example is impressed on the keyboard to separate the pounds and shillings, an impulse is directed to relays (U, W, Fig. 2, not shown) to change over all the contacts (u, w, Fig. 1A, not shown). Impulses representing the number of shillings are then directed over the input lines to energize relays (A, D, E, F and G), a binary code connection being used between the input contacts and relays. If the number of shillings is greater than ten a relay C is also energized. The keying of the second shillings digit energizes relay B which consequently energizes relay M so that when the impulse representing the pence is transmitted over one of the twelve input lines, one or more of the relays H, J, K, L is energized. An impulse then applied (to a line 26, Fig. 4, not shown) is directed, dependent on the position of contacts (c, d, e, f) to the output lines 0 to 9 representing the first decimal place. A further impulse is then applied via a line (37, Fig. 5, not shown) to similar circuitry so that an output representing the second decimal place is obtained on lines 0 to 9. Further impulses produce the remaining decimal places before all the relays are returned to their reset positions. Conversion to sterling.-The digits representing the pounds are routed directed over ten lines (51b-60b, Fig. 1B, not shown) directly to the input unit and when the decimal point is reached a relay (V) is operated to change its contacts (v). An impulse representing the first decimal place then energizes one or more relays (IW, IX, IY, IZ) and, if the digit is greater than five, a further relay (IE). Another relay (IRI) is also energized so that the impulse representing the second decimal place is directed to further relays (IS, IT, IU, IV) resulting in the energization of two relays (IPI and IFI). The impulse for the third decimal place, is passed to one or more relays (IG to IO). A relay (IF) is energized by any of these relays so further impulses are blocked. If the relay (IE) indicating that the first decimal place digit is greater than five has been energized a first impulse applied over a line (40) to a printing magnet causes a "1" to be printed in the first shillings position. A second impulse applied over a line (47) is directed according to the position of contacts (id, iw, ix, iy, iz, Fig. 9, not shown) to output leads 0 to 9 representing the second shillings position. After the printing of a space, a further impulse is directed to the appropriate output and a further impulse is applied to similar circuitry so that the second pence digit is obtained. Since no finite decimal equivale nt exists for some of the pence, simultaneously with the printing, the decimal value is set up in the input side of the converter for use in further calculation. Adaption for tons, hundredweights and quarters. The tons and hundredweights are directed to the calculator in the same way as the pounds and the shillings but a further relay (TQ, Fig. 12, not shown) is added so that impulses representing one, two and three quarters are connected by contacts (tq) to the three, six and nine pence lines.