Patent GB-640024-A (GB)
Abstract: 640,024. Calculating-apparatus. FELT & TARRANT MANUFACTURING CO. July 11, 1947, No. 18466. Convention date, Feb. 5, 1945. [Class 106 (i)] In a calculating-machine having an actuator for each order of the totalizer, each actuator being controlled by a column of digit keys, and inter-order transmission means for causing the automatic operation of any actuators below that of the highest order in which a digit key has been depressed, the transmission means operates further means to operate simultaneously the actuators in such lower orders. The invention is shown embodied in a machine of the kind described in Specification 601,375 in which, in adding operations, depression of a digit key 24, Fig. 2, depresses a bar 73 connected to an actuation control bar 81 whereby the latter is moved downward and to the right. A dog 77 on the bar 73 depresses a lever 78 to lower a hook 32 into engagement with a continuously-rotating driving-wheel 31. The hook 32 is pivoted to a link 37, so that when the driving-wheel engages the hook, the link is pulled to the left to drive a sector 38 through a yieldable clutch 36. The extent of movement of the sector 38 is controlled by a differential bar, the totalizer driving pinion being engaged with the sector during the return stroke of the latter. Subtraction. This mechanism is similar to that described in Specification 601,375. Depression of the " minus " key 26 (not shown) sets the machine for key-set operation. Division. This is also, apart from certain modifications set out below, similar to that described in Specification 601,375. Depression of the division key 28, Fig. 3, rocks a shaft 55 to reciprocate transverse members 63, 64 which support the complemental stop bars 65, 66 adapted to control the downward idling movement of the gear sectors 38 corresponding to the value of the keys 24 depressed. The division key also shifts, through an arm 96, a shaft 99 having arms 107, Fig. 5, adapted to move levers 103 laterally on a shaft 102. These levers have overlapping arms 104, 105 adapted to cause the lower orders to the right of the order in which a key 24 is depressed to be actuated to cause ten to be added to the units order and nine in each other lower order. The movement of the bars 81 is assisted by cams 113 on the clutches 36. To prevent errors arising through a too rapid re-depression of the keys 24, the automaticallyactuated orders are arranged to be substantially simultaneously operated. A transverse rod 115, Figs. 5 and 7, has pivoted thereon a central twoarmed lever 116 embracing the tail 112 of one lever 103, and levers 122 to the left engaging over, and levers 126 to the right engaging under, the opposed tails of the other levers 103. All the levers 116, 122, 126 are keyed to a shaft 132 pulled rearwardly against a stop by a spring 138. Thus forward movement of any one power actuation bar 81 due to depression of its associated key in or to the left of the order with which the lever 116 is associated, swings all the levers 116, 122, 126 counterclockwise. The levers 122 permit their overlapping levers 103 to cause nine to be added in the lower orders where no key was depressed, and the central lever 116 and the levers 126 to the right thereof positively move the other levers 103 to cause the offset lever arms 105 to engage pins 108 to move the bars 81 forwardly to add ten in the units order and nine in each of the other orders to the left thereof, including that order with which the lever 116 is associated if no digit keys were depressed therein. Key latching and key interlocks. These are as described in Specification 601,375, except that key-detaining means yieldably hold down the digit key 24 in each order wherein such a key is depressed until the parallel motion bar 73 of each such order is free to return to normal elevated position; if this key-detaining means already has been moved to a key-detaining position in response to key action in a higher order before a key in its order is depressed, the detaining means yield in response to the downwardly moving key to permit the proper manipulation of the key under such conditions. A bar 143, Fig. 2, in each order, having locking lugs 144 thereon, is slidably mounted on studs between one of the bars 73 and a second bar 149. Depression of any key 24 moves the bars 143, 149 to the left so that a lug 144 engages an aperture 156, Fig. 3, in the key until the bar 73 is returned to elevated position. If any bar 73 is in its lower position due to automatic actuation thereof and one of its associated keys 24 is depressed, the lower end of the key engages a cam surface on the corresponding lug 144 to move the bar 143 to the right relatively to the bars 73, 149, and the bar 143 is then returned by a spring 155 to cause the lug to engage the aperture in the key. The key is then detained until the bar 73 is elevated.