Patent GB-505591-A (GB)
Title: Improvements in or relating to multiplying machines
IPC: G06F7/46
Filed: 1937-11-13
Abstract: 505,591. Calculating - apparatus. BRITISH TABULATING MACHINE Co., Ltd. Nov. 13, 1937, Nos. 31229 and 31230. Convention dates, Nov. 14, 1936 and Sept. 10, 1937. Addition to 501,538. [Class 106 (i)] A multiplying- machine as described in the parent Specification is provided with means for determining when the multiplier accumulator, or all of them, registers zero, and operable, when this occurs, to terminate the halving and doubling operations and to initiate the next operation of the machine thereby eliminating idle cycles. In the present machine the cards are fed in successive cycles to the positions R1, R2 and R3, Fig. 4, to pass brushes UB, LB and operate contacts LCL 1-5, and ECL 1-3. The brushes UB are set in a position to co-operate with the zero holes in a card which is in the position R2. The brushes UB and additional brushes UBa cooperate with a conducting roller 13a and are connected in pairs as shown in Fig. 1. If the multiplier contains a single digit only the brushes UB for the hundred thousands to the tens denomination will engage the roller 13a through the zero perforations and a circuit will be completed through the line 80, contacts LCL2 now closed, lead 132, brushes UBa and UB, lead 136, closed contacts TP10 and TP6 to energise relay E. A branch connection 135 and contacts TP9 connect the hundreds brush UBa to a relay C ; a third branch connection 134 and contacts TP8, connect the thousands brush UB to relays A and B. None of the relay circuits will be completed if the multiplier contains more than three figures, relays A and B will be energized for a three figure multiplier, relays A, B and C for a two figure multiplier and all four for a single figure multiplier. During the cycle that the card is advanced to position R3 the multiplicand is read and entered in the accumulator MC, Fig. 3, the multiplier is read and entered in the accumulators A, B and C, Figs. 1a and 2. The leads 92 from the lower brushes LB are connected to contacts A1 of relay A which in the position shown allow entry into the appropriate accumulators. For a three figure or less multiplier the relay is energized to alter the contacts so that a single digit multiplier is entered. During this cycle also the cam contacts L4 close to energize relay H to close contacts H2, Fig. 3, and H3, Fig. 1a. At the end of the cycle when 'contacts ECL2 are closed the coil D is energized its contacts D1 and D2 are closed to allow doubling, halving and transferring cycles to be performed as described in the parent Specification. When the accumulators A, B and C, reach zero contacts 41c are bridged by the brushes 40a so that a relay Y will be energized when cam contacts CR8 are closed. The relay Y opens its contacts Y1 to prevent energization of the relay D in succeeding cycles. The relay Y also closes contacts Y2 so that when cam contacts CR10 close a relay IG is energized to transfer the amount from accumulator 2 to 3. The entry into the appropriate denominations is controlled by the relay B. At the end of this gathering cycle the relay 2G is energized and amounts are transferred from accumulator 1 to 3. Thereafter the relay P is energized to close circuit to the print clutch and reset clutch magnets 48, 73. As the relay C is energized when the multiplier is a two-figure number the second gathering cycle is eliminated; if the multiplier is a single-figure number the relay E is energized and a printing cycle, by energizing relay P, will follow the last transfer cycle.