Patent GB-737050-A (GB)
Title: Computing machine
IPC: G06C7/10
Filed: 1953-07-30
Abstract: 737,050. Calculating-apparatus; transfer mechanism. OEIVETTI & C. SOC. PER AZIONI, Ing. C. July 30, 1953 [Aug. 1, 1952], No. 21194/53. Class 106 (1). [Also in Group XVI] In a calculating-machine having a totalizer and type carriers differentially movable by two corresponding sets of differential members, one of which is positioned in amount-entering operations under control of an indexing mechanism such as a pin carriage and in turn controls the positioning of the other set, the totalizer is engaged during total-taking by the differential members associated with the type carriers. Keyboard. Setting mechanism. A singlebank keyboard comprises add and subtract control keys 511, 52<SP>1</SP> for a first totalizer arranged adjacent to total and subtotal keys 49<SP>11</SP>, 50<SP>11</SP> for a second totalizer. Similarly the add and subtract keys for the second totalizer are arranged on either side of the total and subtotal keys for the first totalizer. The amount keys control the setting of the pins 3 in a carriage 4. At the end of an operation, a cam rocks a plate, Fig. 3 (not shown), which simultaneously restores all of the set pins. Differential mechanism. A rod 10 in a camcontrolled bail 11 permits springs to drive slides 5 to positions determined by the set pins 3 of the carriage 4. At the same time, a shaft 28 is rocked clockwise. Springs 25 hold arms 24 against a rod 26 carried by a bail fast on the shaft 28, and during its initial rotation, the arms are rocked slightly into engagement with the shaft. Thereafter, the springs 25 rock the arms about the shaft 28 and the arms raise actuators 21 into engagement with fingers 48 of the slides 5. Addition. Subtraction. Each of the two totalizers comprises for each denomination a pair of constantly meshing pinions 18, 19. For addition, the pinions 18 are meshed with the actuators 21 during the return stroke. For subtraction, the totalizer frame is rocked through 180 degrees and the pinions 19 are meshed with the actuators 21 during the return stroke. Total- and subtotal-taking. Transmitting totals. The totalizer from which a total or subtotal is to be taken is meshed with the slides 5 at the beginning of the cycle and each wheel is driven to the zero position which is determined by the engagement of a transfer tooth 20 on the wheel with a fixed stop 44<SP>1</SP>. The wheels 19 or 18 are meshed with the slides 5 according to whether the total is positive or negative respectively. When a subtotal is taken, the totalizer remains engaged with the slides 5 during the return stroke. The total or subtotal may be transmitted from one to the other totalizer by engaging the latter with the actuators 21 during the return stroke. To ensure proper alignment of the print made during a total or subtotal operation and to permit a clearance between the transfer teeth 20 and stops 44<SP>1</SP>, the slides 5 are restored always slightly beyond the zero position. A comb plate 46, which normally blocks movement of the slides 5 corresponding to denominations above the highest significant figure, is moved from blocking position with the carriage through a half step or independently. The machine may be modified so that the actuators 21 are inoperative in total and subtotal operations. Repeat operations. When an amount is to be repeatedly entered, the slides 5 may be locked at the end of the forward stroke of the first operation. The plate, Fig. 3 (not shown), which normally restores the set pins of the carriage 4 may be disengaged from its operating cam by axial movement along its pivot. Transfer mechanism. At transfer, a tooth 20 on the pinion meshing with the corresponding actuator 21 rocks a lever 39 associated also with the corresponding order of the other totalizer. An arm 35 is then rocked by a spring 37 out of the path of a projection 34 of the next higher order actuator 21, which is thus permitted an extra step of movement. Printing mechanism. Pivoted to each slide 5 is a rack 14 meshing with a pinion 15 secured to a type-wheel 16 carried by a slide 83. Early in an operation, a bar 86 allows the slides 83 to engage latches 96 which are later actuated, in those denominations in which digits have been set, to allow springs 85 to drive the slides 83 carrying the type wheels against the platen. The slides are restored by the bar 86. Each rack 14 is held constantly in mesh with its pinion 15 by a lug 97 secured to the slide 83. Non-print. Symbol printing. Operation of a non-print key 224 cams a slide 95 laterally so as to free for operation a lever 226 bearing a special symbol type. The lever 226 is released during the operation by a cam-controlled lever 215.