Patent GB-1077819-A (GB)
Abstract: 1,077,819. Multiplying machines. MONROE INTERNATIONAL CORPORATION. Jan. 13, 1965 [Jan. 16, 1964]. No. 1583/65. Heading G4B. In a calculating machine, which performs multiplication automatically by the shortened method, rotary digital actuators 7 (Fig. 1, not shown) are adapted to be movable with respect to a product register 6 so that either, for the digits 1-5, the set digits of the actuators may register with the product register for normal addition of the multiplicand or, for digits 6-9, the complement of the set digits registers for short cut multiplication by complemental addition. Multiplicand entry.-Upon depression of keys (1, Fig. 1a, not shown) the values are entered into selector gears (20) of the selector carriage (2) from highest to lowest order, the carriage being shifted one step on each entry so that the highest order gear (20) is above the highest order rack (18, 23) when all the digits have been entered. The carriage (2) is then lowered so that the gears are in engagement with the racks, and on depression of the multiplicand entry key (14, Fig. 2, not shown) the actuator unit 7 is moved a step to the right and lowered so that gears (28, Fig. 1b, not shown) engage the racks 23 for the value entering. The gears 28 as they rotate rock teeth (26t, Fig. 8, not shown, Fig. 9) on the digital actuators 26 so that the multiplicand is set up in the unit 7. Multiplier entry.-After the multiplier has been entered into the selector carriage 2, depression of the multiplier entering key lowers the storage gears 30 (Fig. 9) of a multiplier register 9 into engagement with the racks 23 so that on the return stroke of the racks the multiplier is entered into the gears 30. Integral with each gear is a cam 31, which controls fingers (242, 243, Fig. 25, not shown) permitting bails 247 to be raised by a lug 27s on the carriage 7 if a digit 1-5 is set and 247 and 248 if a digit 6-9 is set. Counting means for the multiplier register.- The storage gears 30 of register 9 are counted to zero successively from lower to higher orders, the shaft carrying the digital actuators being rotated once for each step movement of the gears 30 so that, by engagement of the teeth 26t with the gears 87 of the product register 6, the multiplicand is added a corresponding number of times in the product register. If the first storage gear with a significant digit is set for 1-5, the gear is counted downwards to zero by a counting finger (203, Fig. 15, not shown) and lever 242 then rocked to release bail 247. The carriage with counting unit and actuator 7 is then shifted to the next higher ordinal position. When one of the storage gears is set for a digit 6-9, a counter finger 204 is actuated by the raised bail 247 to count the storage gear up to zero and simultaneously the digital actuators are moved a short step to the right so that the unset teeth 26t (that is the complement of the set teeth) engage the gears 87 of the product register, a digit " 1 " being added to the next higher order gear 30. When the counting unit has engaged all the significant storage gears, the product may be taken from the register 6 by lowering it into engagement with the racks, from which it may be fed into an accumulator (34, Fig. 1b, not shown) and the product then printed, digit type wheels of a printing machine being entrained with the racks.