Patent GB-479234-A (GB)
Abstract: 479,234. Calculatiug-machines. AKTIEBOLAGET ORIGINAL-ODHNER. Dec. 21. 1936, No. 35091. Convention date, Dec. 21, 1936. [Class 106 (i)] An adding and subtracting machine comprises a plurality of totalizer wheels mounted to rotate about a fixed shaft, each totalizer wheel having a pinion constantly meshing therewith and mounted to swing about the centre thereof into and out of engagement with the actuator rack. Totalizer, actuation. The totalizer comprises denominational wheels 1 mounted on a stationary shaft 2, Fig. 1, each wheel 1 meshes with pinions 6, 7 carried by shafts 4, 5 on a rocking arm 3, the arm 3 being rocked, by depressing special keys or by some other manipulation, clockwise for addition and counterclockwise for subtraction, until the pinion 6 or 7 meshes respectively with the teeth 8 or 10 of the differentially set actuating rack 9. Differential] mechanism, machine operation. When the main shaft of the machine is operated, a shaft 31 moves a bail 37 to the position 37<1> permitting a coil spring 38 to rock a bellcrank lever 32, which through a pin 33 advances a slide 14 and with it the rack 9 until held bv a projection 30 on the bar 14, engaging a stop bar 27 depressed by the actuated key 28 ; the machine being either of the ten key type or having a full keyboard. The totalizer wheels are actuated during the forward movement of the racks at the end of which the arm 3 is rocked to the neutral position shown in Fig. 1 to disengage the operative pinions 6 or 7, and the racks are then returned by return of the bail 37. Transfer mechanism. Each totalizer wheel 1, Fig. 2, is rigid with a disc 39, a projection 40 on which rocks a lever 43 at transfer to raise a spring biassed pawl 20 pivoted at 21. The notched end 22 of pawl 20 thereby releases the heel 23 of the bar 14 of the next higher denomination when a spring 17 moves the corresponding rack 9 to the right, Fig. 1, relatively to the bar 14, a distance, determined by the pin-slot connections 12, 15 and 13, 16, and equivalent to one rack tooth, whereby the transfer is entered upon the corresponding totalizer wheel 1, additively or subtractively according to whether the pinion 6 or 7 is operative. During operation of the machine a bail 26, Fig. 1, is moved to the position 26<1> and during the return of the bars 14 the bail 26 is returned and resets the rack 9 relatively to the bar 14. Total taking. For taking a positive total, a special key is depressed or some other manipulation performed to rock the arms 3 counterclockwise to mesh the pinions 7 with the racks 9, and a half round shaft 45 is rotated to lock all the transfer levers 43. The shaft 31 is then rotated to move bail 37 to 37<1> whereupon the coil springs 38 advance the racks 9 until the corresponding totalizer wheels 1 have moved back to zero, where they are stopped by the transfer projections 40 engaging the locked levers 43. Simultaneously each bell-crank lever 32 raises a type bar 35 an amount corresponding to the movement of the rack 9 in zeroizing the totalizer wheel 1. After printing of the total the arm 3 is returned to its neutral position after which the racks 9 and type bars 35 are restored to normal when the locking shaft 45 is also restored to release the transfer levers 43. Negative total taking is effected similarly except that the pinions 6 are rocked to engage the racks, and fugitive one arrangements (not shown) are provided. Modifications. In another embodiment each rack 9, Fig. 5, has only one set of rack teeth 8, and the pinion 6 meshes with the pinion 7. For addition the arm 3 is rocked to the position shown where the pinion 6 meshes with the rack teeth 8 and for subtraction the arm 3 is rocked in the other direction until pinion 7 meshes the rack teeth. The arm 3<1> carrying the shaft 5 for the pinions 7 is rigid with the arm 3 but in a, modification the arm 3<1> is pivoted to arm 3, the shaft 5 being guided in an arcuate slot concentric with shaft 2. If the machine is for addition only, the pinions 7 are dispensed with, and the machine arranged so that each totalizing wheel is advanced by pinion 6 the return stroke of the actuating rack, and is returned to zero at a totaltaking operation during the forward stroke of the rack.