Patent GB-500580-A (GB)
Title: Improvements in or relating to calculating machines
IPC: G06C15/06
Filed: 1937-08-13
Abstract: 500,580. Calculating - apparatus. BURROUGHS ADDING' MACHINE CO. Aug. 13, 1937, No. 22296. Convention date, Aug. 14, 1936. [Class 106 (i)] In a calculating-machine means are provided to enable the operator to set up an item on the machine while a total taking operation is being performed and to take a total while an item previously entered in the machine remains set up. For this purpose the differential actuators are freed from control by the item setting means and the restoring means for the setting means are disabled. The invention is shown applied to a Burroughs machine of the type described in Specifications 274,411, and 285,885, [both in Class 106 (i)], automatic repeat mechanism as described in Specification 193,455, [Class 106 (i)]. The detents 35, Figs. 1, 2 and 3, associated with the numeral keys 10, instead of being connected directly to the usual differential stop wires 11, are connected to corresponding shafts 50. Each shaft 50 has loosely mounted thereon an arm 51 to which a stop wire 11 is connected, the arm 51 being held against a pin 53 projecting from the detent 35 by the action of a-spring 52. For each two rows of numeral keys a slide 61 is provided and the lower ends of the arms 51 of the adjacent rows extend downwardly through slots 60 in 'the slide When an amount key is depressed the arm 51 is moved against the rear end of the slot 60 without moving the slide. When the total taking lever 30 is moved forwardly to condition the machine for total taking a pin 62 thereon rocks a bellcrank 64 and through a slide 65, a yoke 68-70, a link 71, and an arm 72, rocks a shaft 73 provided with a set of arms co-operating with the slides 61 whereby the slides are moved forwardly so that the stop wires 11 that may have been set hy depression of the amount keys are returned to normal out of the path of the actuators 12. The amount keys remain depressed and when the total lever 30 is returned the arm 51 and stop wire return to their set position. For automatic repeat operations the slide 65 is provided with a stud 81 engaging the end of a leyer 82 operatively connected through a bell-crank 84 with a bail member 86 adapted to engage projections 87 on the zero stops 80 and to release them when the total lever is operated by the known means associated with the travelling carriage. The total key T for the main add-subtraet totalizer 15, 16 is mounted on a bell-crank 91 and is provided with a stud 92 which when depressed engages a cam surface of an extension 94 of the yoke 68 to cause the yoke to disable the stop wires. During a total taking operation the slides 61 are all moved forward and the stop wires will be held by them. An item may be set up since the depression of the keys will rock the detents 35 and merely stretch the springs 52 being held in set position by the latch plates 38. When the total key is released the springs 52 are effective to set the stop wires. The amount keys are released at the end of each machine cycle by a bail 42 operated by a pass-by pawl 44 on a three-armed lever 101 unless a repeat key has been depressed or unless a repeat roller on the carriage is active. A repeat slide 45 is moved to block the movement of the lever 101.