Patent GB-1055714-A (GB)
Abstract: 1,055,714. Mechanical calculators. WALTHER BœROMASCHINEN G.m.b.H. March 5, 1964 [March 6, 1963], No. 9424/64. Heading G4B. A mechanical calculating machine has a pin carriage which includes an additional set of pins into which the differential members can set a value taken from a totalizer. The machine described is a ten key, four rules, machine and is particularly adapted for compound multiplications, in which an accumulated total is transferred to the pin carriage to be multiplied by a preselected multiplier which is permanently stored in a multiplication mechanism not shown. The pin carriage includes the usual set of pins 22 and an additional set 86. Before an amount is entered the pin carriage is in the position shown. Entry of data.-As the digits are entered on the ten-key keyboard the pin carriage steps to the left from the position shown, and at each step the key stems, which act along a line IV-IV, Fig. 3 (not shown) depress a corresponding pin in each row. When an amount has been entered in the pin carriage and the carriage has shifted sufficiently far to the left to move the pins 86 out of the path of the actuators, the actuators 32 are released by the movement of a bail 74, Fig. 2, to the right so that the actuators are differentially positioned as stops 31 engage the set pins. The actuators impart corresponding movements to the differential members 34, and type wheels 41 are simultaneously set. During the second half of the machine cycle a toggle link 89, 92 is collapsed to lower the actuators 32 out of the path of the pins and then the bail 74 returns the actuators 34, during which motion the totalizer 55 is engaged either additively or subtractively with the teeth on the differential members. Since the pin carriage is no longer operative, it may be returned so that the next entry can commence. Setting the pin carriage from the totalizer.- To set the pin carriage according to the amount in the totalizer, the actuators 32 are lowered out of the path of the pins and with the pin carriage still in its initial position as shown in Fig. 2, and the totalizer engaged with the differential members as in a total taking operation the actuators 32 are advanced so that the totalizer is zeroized in which position the actuators are arrested. While the differential members are still in this position the toggle levers are erected to raise the actuators 32 so that those of the pins 86 which are positioned above the lifting faces 87 behind each stop 31 are raised from their normal position so that they no longer block the path of the raised actuators. Thus when the actuators are released during the next cycle, the pins 86 which have not been raised act as abutments for the stops 31 and thus the differential members 37 can be positioned in accordance with the total previously stored in the totalizer 55. Before the amount set in the pin carriage is used, the carriage can be shifted any number of steps to the right so that the less significant digits are " ignored ". The most significant of these " ignored " digits is used to set an additional actuator, on the differential member of which is a pawl 146 which trips a carry mechanism 66 on the return of the differential if it moves through a distance corresponding to a digit greater than five so as to round off the number.