Patent GB-283137-A (GB)
Abstract: 283,137. Friden, C. M. F. Jan. 4, 1927, [Convention date]. Multiplying and dividing apparatus.-In machines for performing calculations according to the four rules means are provided for effecting the division operations automatically the differential actuating mechanism being driven in the additive sense for one cycle after a number of subtractive operations which is one in excess of the requisite number. In the machine shown in Figs. 1, 2 and 13, the rotary differential actuators 2 are driven, through gearing 41, a clutch 13, and reversing mechanism 24, 25, 31, 32, from a motor 8, the actuators being similar to those described in Specification 207,858. The reversing gears 24, 25, Fig. 14, are journaled on a hollow shaft 23 secured to the clutch housing and have interrupted flanges 26 facing each other either of which is adapted to be connected to the shaft by a pin 27 secured to a rod 28 when moved longitudinally. The rod 28 may be moved manually through depression of a subtract key 51, Fig. 11, which moves a bell crank lever 52, link 55 and lever 56 the cam shaped end 57 of the lever engaging a groove in a rod 39 connected by a spring-controlled forked member 38 with the rod 28; the shifting may be effected automaticallv as hereafter described. The subtract key 51 and an add bar 61 on depression are also adapted to rock a bell crank lever 62 to move a bar 71, having a pin and slot connection 72, 73 with the clutch operating lever 18, to render the clutch operative. The bar 71 may be raised by means hereinafter described for releasing the clutch lever 18. The revolutions or quotients counter 75, Fig. 11, is actuated by a single-toothed disc 78 splined on a shaft 79 and moved laterally thereon by means connected to the totalizer carriage 5 as described in Specification 212,206. The transfer mechanism is of known form and is actuated by two series of pins 82, 83, Fig. 2, in spiral formation on a drum 81 adapted to be rotated by a gear 85 slidably mounted to engage one or other of the reversing pinions 31, 32 whereby the direction of rotation may be reversed with respect to that of the actuators. The gear 85 is connected by a forked member 87 to a shifting rod 94 operated by the cam-shaped end of a setting lever 96, the rod being held in either of its adjusted positions by a spring-pressed ball 97. A finger 101 on the rod 94 co-operates with a notched disc 98 to prevent movement of the rod unless the drum is in its initial position. In performing division the numeral wheels are reversely rotated until the higher denominations show " 9 " indicating an overdraft condition and this movement of the wheel of highest denomination is utilized to cause reversal of the actuators for one additive cycle. Pivoted on an axis at right angles to the centre line of the transfer pin 112 of the next lower denomination actuator, viz. 2<a>, Fig. 1, is an oscillatable lever 117, Fig. 3, which bears on a projection on the pin 112 so that as the pin is moved by the cam 116 of the transfer lever the lever 117 is oscillated to bring its other end into the path of the end of a lever 122 to rock it immediately before the actuators reach their full cycle or normal position. The lower end of the lever 122 extends through an aperture in a fixed plate 127 and into a slide 128 the movement of which, through a lever 129 engaging the forked member 38, effects a shifting of the rod 28 to reverse the direction of rotation of the actuators. 'To stop the machine after one cycle in this direction of rotation the actuator 2<a> is provided with a laterally projecting pin 142, Fig. 8, for cooperation with the end of a lever 144 universally pivoted on a stud 146. The lever 144 normally lies to one side of the path of the pin 142 but when the transfer lever 6 is moved by the passage of the higher numeral wheel from " 0 " to " 9 " a boss 154 on the transfer lever rocks a' lever 156 and, through engagement with a cam surface 158 on the lever 144, causes a movement thereof so that its end 145 lies in the path of the pin 142. The lever 144 is rocked during the passage of the pin and its lower end rocks a lever 138, Fig. 2, and through an interconnected lever 135, the end 136 of which engages the bar 71, raises the bar to free the clutch-operating lever 18. In the normal operation for subtraction the pin 142 will have passed the end 145 of the lever 144 before it is moved by the transfer lever so that this mechanism is not operative in the reverse direction of rotation. The stop lever 144 is moved to inoperative position when the shaft lever 96 is moved forward by means of a rod 161 secured to the rod 94 and engaging the lever 144.