Patent GB-464422-A (GB)
Abstract: 464,422. Calculating - apparatus. NYBERG, E. V. Oct. 17, 1935, No. 28737. Convention date, Oct. 17, 1934. [Class 106 (i)] Adding-apparatus; multiplying and dividing apparatus.-In a ten-key machine the differential setting is effected by projecting varying numbers of teeth, depending on the key depressed, into the path of movement of planetary gear pinions in mesh with sun wheels forming actuating members mounted for rotation on a main operating shaft and operatively connected to the totalizer. The teeth are mounted in rows in a laterally movable carriage that is held stationary during the calculating operation. In the form shown the keys 30, Figs. 1 and 4, actuate levers 31 connected to arms 32 on a shaft 57. Each arm is formed with a projection underlying the arm associated with the digit of next lower value so that when an arm is rocked all lower arms are moved therewith and projections 33 on the arms raise the appropriate number of teeth 3 into operative position. The teeth are mounted in a laterally movable carriage 2 controlled by an escapement mechanism comprising a spring drum 40, Fig. 3, a member 35, a fixed rack 36, and a pivotally mounted rack 37 normally engaging member 35. Each time the zero key is depressed its arm 32a rocks the member 35 to free it from the rack 37 and the carriage moves half a step ; release of the key completes the second half step movement. A latch bar 5, Figs. 1 and 8, pivoted on pins 52 co-operates with shoulders 4 on the teeth to hold them in raised position. When the carriage is returned to initial position, projections 41 on the detent bars co-operate with a fixed bar 42, Fig. 3, to rock the bars 5 and free the teeth which fall to inoperative position. The carriage is released from the escapement mechanism by depression of a tabulating key 43 that is operatively connected to an arm 61 associated with the rack 37 whereby the rack is freed from engagement with the member 35. The main operating shaft 6 carries a number of pairs of arms 7, Figs. 1, 3, 6 and 7, and between each pair is arranged an actuator wheel 8 loose on the shaft 6, a pinion 9 journalled on the arms, and an intermediate gear 10. When the shaft 6 is rotated the pinions 9 mesh with the adjusted teeth 3 and transmit the setting to the actuator wheels 8. These wheels also mesh with gear wheels 24 and transmit the movement to the pinions 25 of the totalizer numeral wheels 23. Detent and overthrow preventing means for the actuator wheels is constituted by spring controlled pawls 11 pivoted on the arms 7 and arranged on opposite sides of the pinions 9. The main shaft 6 carries two recessed discs 56, 56a, Fig. 9, that co-operate with rollers 27, 27a on spring-controlled arms 28, 28a to determine the home or rest position of the operating crank arm 53. Transfer mechanism.-The carry-over to the next higher denomination is effected by a double cam 15, Figs. 6 and 7, secured to the wheel 8 co-operating with a chamfered shoulder 16 of a slide 17 mounted for longitudinal displacement on the arms 7. When the slide is pushed radially outwards its end rocks a spring-controlled finger 19 so as to position a tooth 22 thereon into the path of movement of the pinion 9 of next higher denomination. The fingers 19 are mounted in brackets 21 on a cylinder 18 enclosing the actuating mechanism. Revolutions counting mechanism.-The main operating shaft 6 carries a gear 67a in train with gears 67, 66. The gear 66 drives a shaft 65a on which is mounted a single tooth 65 adapted to engage a toothed wheel 64 integral with a numeral wheel of a counter 63. Zeroizing-mechanism.-The totalizer, and revolutions-counter wheels are zeroized in a known manner by rotating their shafts by means-of toothed sectors 68, 72 operated by clearing keys 70, 71.