Patent GB-317014-A (GB)
Title: Improvements in or relating to calculating or accounting machines
IPC: G06C21/04
Filed: 1929-08-07
Abstract: 317,014. Burroughs Adding Machine Co., (Assignees of Pasinski, W. J.). Aug. 8, 1928, [Convention date]. Adding and subtracting apparatus; error-checking arrangements.-In a machine particularly for use in the posting of ledger accounts a mechanism is provided for proving the accuracy of the entries made by automatically preventing operation of the machine unless the entry made in a predetermined column agrees with an entry made in a prior predetermined column. As shown applied to a Burroughs adding and listing machine a special set of pinions 10, Figs. 1, 2, 3, and 5 is mounted on a longitudinally movable shaft 11 automatically controlled by the paper carnage C, to position the pinions for co-operation with the actuator racks 610, through a universal joint 13, shaft 14, lever 17, arm 19, yoke 20 and cam plate 23 on the carriage. The shaft 14 is normally locked against movement by a pawl 24 engaging the teeth of a sector 25 fixed to the shaft and is released during the forward stroke of the rock shaft 800 by a flange 27 on the operating lever 813 engaging a pass-by pawl 28 on the pawl 24. If, at the time the shaft 14 is released, the cam plate 23 permits upward movement of the roller 22 of the yoke 20 the shaft 14 will be rocked clockwise by means of the spring 15. If, however, the cam plate has moved the roller 22 downwardly the spring 18 connecting the lever-arms 17, 19 will have been tensioned and the shaft 14 will, on release, move counterclockwise. The shaft 11 may also carry additional pinions such as 12 making up counters for totalizing entries in other column positions. The pinions on the shaft 11 are rocked into and out of engagement with the actuator racks by means of a cam 30 fixed to the shaft 800 co-operating with pass-by pawls 31, 32 on a slidable yoke 33 connected by a link 34 to the shaft 11. The yoke 33 may be moved laterally to position the pawls for engagement by different surfaces of the cam by means of a bell-crank lever 35 operated by a lever 36 controlled by a hand lever 37 which normally occupies a central or adding position but is adapted to be moved forwardly or backwardly for total and subtotal operations respectively. The pinions 10 may be kept out of engagement with the racks during both the forward and backward stroke of the shaft 800 by depression of a non-add key or automatically, under control of the carriage, by means of a roller 44 thereon engaging an arm 43 on a yoke 41 having an arm 42 connected to a lever 40 which through a pin 46 on a link 45 rocks a lever to disable the pass-by pawl 32. When the carriage is moved to the " old balance " position and the amount set on the keys the machine is operated to enter the amount on the pinions 10 as well as on the totalizing counter 916. The carriage then moves to the next columnar position, the shaft 11 being displaced to move the pinions out of co-operative relation with the actuator racks and, at the same time, to set one of the counters 12 in active position. After entering the " charges " or " credits " items the carriage is tabulated to a " proof " position where the " old balance " is again entered. In this position a roller 70, Fig. 3, on the carriage engages and depresses an arm 71 of a pivoted yoke 72 having an arm 73 co-operating with a lever 74 connected to a bell-crank lever 75 to which is attached a link 76 bifurcated at its forward end to engage a stud 77 on the arm 36 whereby the arm 36 is rocked to position the control yoke 33 as if a total were to be taken from the pinions 10. Movement of the arm 36, independently of the hand lever 37, is effected by reason of the connection therebetween comprising a projection 79 on the arm 36 connected by a spring 80 to a lever 81 loose on the stud 78 and bifurcated at one end to engage a pin 82 on the lever 37 and bearing at its other end on a pin 83 extending from the arm 36. When the " old balance " is entered the second time the pinons 10 are returned by the actuator racks until the racks are arrested by the stop wires 270. The zero pawls 60, Fig. 8, associated with the pinions 11 are disabled, when the carriage is moved to the " proof " position, by means of a lug 90, Fig. 3, on the link 76 engaging a projection 91 on a link 92 connected to an arm 93 on a shaft 94 which shaft is provided with another arm 95 connected by a link 96 to an arm 97 on a shaft 98, the shaft 98 being rocked by displacement of the slide 76 to cause the bifurcated lugs 99 on the shaft 98 to engage pins 102 on links 100 connected to the pawls 60. The shaft 98 is urged in a counter clockwise direction by a spring 107 to cause the pointed noses 105 of arm 106 on the shaft to bear on the annular shoulders 103 of the pinions 10. At the zero position of the pinions the noses are adapted to enter a slot 104 in the shoulders 103. If the " old balance " as entered the second time does not correspond to the first entry, the pinions 10 will not be returned to the zero position so that one or more of the noses 105 will be arrested by the shoulders 103. The shaft 98 thereby assumes a position such that the arm 110 secured thereto moves a link 111 to set a projection 113 thereon into the path of a stud 114 on a starting control bar 9 to block its movement. This bar is associated with the motor starting key and will be arrested to prevent operation of the motor driving mechanism. In order that the noses 105 may not interfere with the longitudinal shifting of the shaft 11 the link 92 by means of which the shaft 98 is rocked has a slot 120 engaging a pin 121 on an arm 122 cooperating through lateral projections 125, 126 with an arm 127 fixed to the shaft 800 so arranged that on the forward stroke the projections 126 is moved away from the projection 125 and a spring 124 moves the arm 122 counter clockwise to rock the shaft 98 clockwise to withdraw the noses 105. In the embodiment shown after the machine has been operated in the " proof " position the carriage is tabulated to a " second proof " position wherein the counter 12 is aligned with the actuators and the noses 105 are aligned with the shoulders 103, Fig. 5, and the " charges " again entered and printed. If the pinions 10 were not returned to zero in the " proof " position the machine cannot be operated in the " second proof " position as above described. In the "proof" position the machine is conditioned for subtraction and in the " second proof " position for taking a total from the main counter 916, the counter 12 being utilized to accumulate the " charges. The starting control bar is freed automatically by returning the carriage to the first columnar position by means of a roller 130, Fig. 3, operating to depress the lever 71 sufficiently to move the link 111 to the position shown. Specification 12083/07 is referred to.