Patent GB-417991-A (GB)
Abstract: 417,991. Calculating - apparatus. BURROUGHS ADDING MACHINE CO., 2nd Avenue, Detroit, Michigan, U.S.A.- (Assignees of Butler, T. M. ; 2nd Boulevard, Detroit, Michigan, U.S.A.) Jan. 10, 1933, No. 851. Convention date, Jan. 11, 1932. [Class 106 (i).] Adding and subtracting apparatus.-In a machine having an adding and subtracting totalizer comprising sets of interconnected pinions the selection of the appropriate set of pinions is automatically brought about during the movement of the totalizer into engaging position with respect to the differential actuators. Means are also provided for yielding a true negative total, for inserting a " fugitive 1 " in the totalizer when it changes from a positive to a negative condition or vice-versa, and for preventing any movement of the " fugitive 1 " mechanism as the capacity of the totalizer is exceeded in either direction. The invention is shown applied to a Burroughs portable machine as described in Specification 265,122, [Class 106 (i)]. The machine in one embodiment comprises the usual features with a bank of control keys and a subtract lever 12, Fig. 1, to condition the machine for addition or subtraction. The main shaft 14 carries a drive plate 21 that co-operates with a pitman 20 to effect the engagement of the totalizer pinions with the actuating racks 15. The totalizer is of the tumbler type with inter-engaging sets of pinions 30, 40, Fig. 5, mounted on shafts 31, 41, in a U-shaped frame 32 having stub shafts journalled in the arms 34 of a rockable frame secured to a shaft 35 and adapted to be rocked by the engagement of a roller 39 on an extension of the stub shaft 33 with a cam 38 operatively connected to the pitman 20. The stub shaft 33 carries a plate with studs 42, 43 co-operating with notches in spring controlled latch arms 44, 45 to hold the totalizer in add or subtract position respectively. The tumbling of the frame 32 to one or other position is under the control of the arm 50 of a yoke 51 that is connected by pin and slot means to another yoke 55 having an arm connected by a link 57 to the subtract lever 12. The totalizer is shown in the add position in Fig. 3 and if an item is to be subtracted the lever 12 is manipulated to lower the arm 50 to a position in front of the pin 43 so that at the beginning of the return stroke of operation the frame 32 is rocked to its subtract' position. To hold the pinions against movement during the tumbling operation a projection 60 on the frame 32 rocks a cam lover 62 which through engagement with a pin 64 operates a bail 68 to engage the pinions. Transfer mechanism. -This mechanism is of the type described in Specification 265,134 modified to co-operate with two sets of totalizer pinions. Each denomination includes a transfer segment 70, Fig. 6, a latch 74, a trip pawl 77, and a trip latch 85. When a totalizer pinion passes through " o " the transfer tooth pushes the pawl 77 rearwardly in which position it is held by the latch 85. On disengaging the pinions from the racks the pawl 77 pushes on the arm 80 of the latch 74 to release the segment 70 which advances the pinion of next higher denomination. The parts are restored by means of a bail 88 at the beginning of the return stroke in adding operations and in total taking operations the restoration occurs at the beginning of the forward stroke. The pinions 30, 40 of the units denomination are provided with a segment 120, Fig. 10, having an upwardly extending arm 122 with a lateral lug 124 co-operating with a pair of latches 125, 130 for controlling the entry of the " fugitive 1 " when the totalizer goes from positive to negative condition and vice versa. The latch 125 forms part of a yoke 126 to which is secured a pin 129 and the latch 130 forms part of a yoke 131 having a latch arm 132 co-operating with a segment 136 associated with the trip pawl 140 of the pinions of highest denomination. The pin 129 co-operates with the shoulders and bent ends of one or other of a pair of links 154, 156 pivotally attached to a four armed lever 150 the other arms of which have slotted links 152, 153 embracing the shafts 31, 41 of the totalizer pinions. Counterclockwise movement of the links 154, 156 is limited by studs 158, 159 on a pivoted member 160. The tumbling of the totalizer to subtract position will rock the lever 150 to raise the link 154 and through pin 129 will release the latch 125 ; the latch 130 is not released unless the totalizer goes to a negative condition in which case the " fugitive 1 " will be entered. When a negative total occurs the movement of the segment arm 122 through projections 175, 176 rocks an arm 174 and a stud 177 thereon engages the end of the link 154 and thereby rocks the member 160 to a new position in which it is held by detent 164. At the same time the link 156 is moved to engage the pin 129 which is free to move down in the slot as soon as the " fugitive 1 " segment is restored thereby restoring the latch 125 to latching position so that the latch cannot be tripped a second time. If items are added after a negative condition exists the tumbling of the register to the adding position lifts the latch 125 and if the total changes to a positive condition the trip pawl 140 is set to lift the latch 130 thereby effecting the entry of the " fugitive 1 " after which the latch 125 is moved to operative position thus preventing the addition of the " fugitive 1 " on the capacity of the machine being exceeded. Printing totals and subtotals.-Depression of a total key T rocks a lever 90, Fig. 1, and through a pin 92 depresses a lever 93 carrying a pawl 94. The sub-total key ST depresses the lever 93 independently. The pawl 94 is thereby moved in front of a wrist pin 95 on a shaft 97, Fig. 5, carrying a comb plate 98 which co-operates with the trip pawls 77 to prevent their movement rearwardly when the totalizer pinions are returned by the actuating racks to their zero positions thereby forming stops. An aligning shaft 100 for the actuators is operatively connected to the main shaft 14 and to the shaft 97 to rock the comb plate at each operation so as to ensure the positive movement of the trip pawls 77 to their forward position. To notify the operator as to the character of the total before he takes it the subtract lever and total and sub-total keys are associated with a latch slide 180, Figs. 1 and 2 ; with the lever in the add position the keys are free to be depressed, but a movement of the lever to the subtract position causes the slide to move under spring action to lock the keys if the total is positive. When a negative total occurs the movement of the member 160 operates a forked arm 186 of a yoke 187. Another arm 189 of the yoke is connected by a spring 194 to an arm of a yoke 192 another arm of which lies behind the end of the slide 180. If the subtract lever is in subtract position the movement of the member 160 merely extends the spring 194 while if the lever is in its add position the spring will be effective to rock the yoke 192 to push the slide forward to lock the keys against depression. In another embodiment instead of the operator having to set the subtract lever to position for taking a true total, mechanism is provided for obtaining the true total on depression of the total or subtotal key directly. For this purpose an arm 200, Fig. 15, pivoted on the machine frame and formed with projections underlying the key stems carries a slide plate 204 having a projection 205 connected to a link 206 substituted for the latch slide 180. The link 206 is connected to the arm 193 of a bell-crank 191 which is directly connected to the arm 189. The slide plate 204 has a projection 207 which may be positioned to co-operate with a stud 208 on a slide plate 209 or with a stud 220 on a slide plate 221. These slide plates have rearward extensions 213, 225 that co-operate with studs 214,226 on arms of the yoke members 51, 55 respectively to effect the setting of the arm 50 controlling the tumbling movement of the totalizer. Operating by motor.-In a machine with a motor drive as described in Specification 380,777 an add motor bar 230 and a subtract motor bar 241, Fig. 16, is provided which bars co-operate with the slide plates 209, 221 to condition the totalizer for addition or subtraction and to start the motor through the action of the slidable starting member 233. Depression of the total or sub-total key likewise starts the operation of the machine in total taking operations. In this form of machine a lock may be provided for the keys when an overdraft exists. For this purpose a slide 250 is mounted on the keyboard with its rear end adjacent the arm 193 and with a pair of notches 251, 252, Fig. 17, registering with notches in the key stems T, ST when the total is positive. If the total is negative the keys T, ST are released by manipulation of a special release key 254 which by engagement with a lug 257 on the slide 250 moves the slide forwardly to free the keys T, ST by presenting a second set of notches thereto. After the total taking operation the slide 250 is released and moves rearwardly a slight distance as determined by the position of the lever 193 thus again locking the keys against depression. British Specifications 9102/13, 265,136, 265,137, 265,140, and 265,152, [all in Class 106 (i)], and U.S.A. Specification 1,853,050 also are referred to.