Patent GB-560021-A (GB)
Abstract: 560,021. Calculating apparatus. REMINGTON RAND, Inc. April 11, 1942, No. 4800. 'Convention date, May 2, 1941. [Class 106 (i)] In a machine with a creep carry totalizer employing an eccentric differential gear, means are provided for clearing the totalizer wheels simultaneously after a computation. Means are also provided to rectify the indicating drums so as to show the correct accumulated amount after each calculating operation while the creep still exists in the totalizer mechanism. The machine shown has key levers 12, Figs. 1 and 2, movable in slots in the casing 10. The key levers carry detents 15 to coact with a notched segment 16 and are each formed with a gear sector 14 for meshing with a totalizer wheel 24'. The wheels 24 are' mounted on a shaft 17 supported in end plates 18 pivoted on a shaft 20 and are rocked into engagement with the gear sectors by the forward movement of levers 23 which have cam slots 22, Fig. 5, engaging extensions of the shaft 17. Each totalizer unit, Fig. 4, includes a wheel 24, a coupling disc 36, an eccentric gear and bearing 37, 38, and a resultant gear 40 with a snail cam 41. The coupling disc is secured to the wheel 24 and is formed with three holes 42 to co-operate with a set of pins 43 attached to the eccentric gear 37. The gear 37 has nine notches on its periphery to mesh with ten pins or teeth 44 secured to the snail cam 41. The resultant gear 40 which is secured to the other side of the snail cam through a spacer 45 is pinned to a sleeve 46 on the shaft 17. In mesh with *each resultant gear 40 is an intermediate gear 51 that drives an indicating drum 47. The gears 51 and drums 47 are mounted on arms 53 pivoted on the shaft 48 of the drums. Each arm 53 is formed with a slot 54 engaging a pin 55 on a lever arm 56 adjustably secured to a lever 58 rotatably mounted on a shaft 57. Each lever 58 is controlled by a spring 67 and has an arm co-operating with a bail 32 carried by a pair of bent levers 31, Figs. 1 and 5, pivoted on the shaft 20 and provided with pins engaging cam slots 28 in manually operable levers 27. A pin 61 on each lever 58 engages a slot in a corresponding arm 63 of plates 59 rotatable on the shaft 48. The plates 59 have arms 64 with bent ends forming cam followers 65 to cooperate with the snail cams 41. Each indicating drum has a lug 68 to co-operate with a spring urged pawl 70 pivoted on a rod 71 carried by the end supports 18 and formed with a notch for engagement with a latch member 74 pivoted on the plate 59. Limit pins 77 prevent the latches from engaging the pawls until the pawls are forced out by the lugs 68 and the cam followers 65 have been lifted clear of the snail cams 41. Detents 25 are provided to hold the wheels 24 aligned when in disengaged position. In operation for addition the key levers are set to the digits of the number to be entered. The levers 23 are then pulled forward to engage the wheels 24 with the sectors 14, thereupon the key levers 12 are restored to their zero position in any order desired and the amount is entered in the totalizer. For subtraction, the wheels 24 are first brought into engagement and then the key levers set to the desired digits. The wheels 24 are then disengaged and the key levers restored. To clear the totalizer after the total has been noted, the levers 23 and 27 are operated to effect the engagement of the wheels 24 and to move the bail 32 forwardly so that the cam followers 65 act as zero stops in conjunction with the snail cams 41 when the key levers 12 are moved up as far as they will go. The position of the key levers shows the total.