Patent GB-647520-A (GB)
Abstract: 647,520. Calculating-apparatus. CAMPOS, F. July 27, 1942, No. 10487. Convention date, Aug. 18, 1941. [Class 106 (i)] A machine for addition and subtraction comprises a plurality of totalizing-counter units each formed of a set of toothed slides constituting the calculating elements, differential mechanism under the control of banks of keys for selecting the appropriate totalizer unit for operation and banks of keys for entering amounts in accordance with the keys depressed, and printing mechanism for recording the characteristing data, the items and totals and sub-totals of the calculation. The totalizer units are grouped in sections and means are provided for transmitting a positive total or sub-total from a totalizer in one section subtractively to a totalizer in another section. A negative total or sub-total is transmitted additively. In the machine shown in Figs. 1, 2 and 3, two totalizer sections A<SP>1</SP>, A<SP>2</SP> are provided with one hundred units in each section. The keyboard has banks of keys 73 for selecting a totalizer in each section, banks of keys 133 for setting up amounts, a bank of operation control keys 225 for setting for subtraction, non- addition, sub-totals and totals, a set of repeat keys 268 and a set of reset or clearing keys 271. The main operating cam-shaft 70 is driven through a one-revolution clutch 345, 347 (Fig. 34, not shown), under the control of a starting- bar 362, by an electric motor 71. Totalizing-counters and selection mechanism. Each totalizer comprises a set of rack slides 16 arranged horizontally and supported in two bars 15, Figs. 6, 7 and 8, guided for transverse movement on notched bars 13 of a supporting frame. For calculations in the decimal notation each slide 16 has nine teeth 17 on one side and corresponding notches 18 on the other. The bars 15 are connected by a triangular plate 14 which is adapted to be displaced to disengage the notches 18 from vertical locking-bars 20 and to engage a tooth 17 on each denomination slide with the edge of a corresponding upright bar 22. The selection of the appropriate triangular plate for displacement is effected by imparting a rotative and longitudinal movement to a control column 25 to position one of a series of helically disposed fingers 31 thereon opposite the plate. To displace the plate and thereby the selected totalizer slides into operative engagement with the upright bars 22 the respective columns 25 of the two sections A<SP>1</SP>, A2 are supported on pivoted levers 26, 27 rockable about a shaft 28 by the engagement of a roller 83 with a slot in a plate 84, Figs. 4 and 5. A sliding movement is imparted to each plate 84 by a projection thereon engaging an arm 89 operatively associated with an arm 93. The two arms 93 are connected by a push-rod 94 on which is a finger that engages an operating lever 96 co-operating with a cam 99 on the main shaft. The selective setting of each column 25 is con. trolled by the differential stop-bars 50, Fig. 9, associated with the banks of keys 73. Each stop-bar has two differentially-toothed members 52a, 52b for co-operation with the stems of the even and odd numbered keys respectively and carries a pin 49 at its rear end. The pins 49 of the differential stop-bars 50 for the column 25 of section A2 engage a gusset plate on respective slide-bars 35, 42, while the stop-bars 50 for the column of section A<SP>1</SP> engage auxiliary bars 43, 44 that are connected by bars 45, 46 and plates 47, 48 to other slide-bars 35, 42. In operation, the bars 35, 42 of the two sections are moved to extents depending on the keys depressed by the stop-bars 50 which are released for movement by a bail member 58 operated by a linkage and cam 69 on the main shaft 70. Each bar 35 carries a rack 34 which engages a pinion 33 on its control column 25 to rotate it while each bar 42 has a vertical slot 42a which by engagement with a bell-crank 40 and grooved pulley 38 on its column 25 effects the longitudinal displacement thereof. Differential mechanism for entering amounts. The upright bar 22 of each denomination of the two sections is releasably connected to a driving- bar 102 by a projection 22e engaging a pawl 109, Fig. 16, mounted on a right-angled lever 107 pivoted to the driving-bar and connected to its upright bar by a spring 108. A second pawl 110 resiliently connected to the pawl 109 has a pin 113 engaging a longitudinal slot in a corresponding transfer slide 115, Fig. 18, which slot is also engaged by a pin 114 on the lever 107 of the next higher denomination. Movement of the driving-bars is controlled from the amount key banks 133 by means of differential stop-bars 125, each having a pin 124 to engage a projection 102a on its driving-bar and carrying four toothed members arranged in pairs 127a, 127c and 127b, 127d for co-operation with the odd and even numbered keys in addition and subtraction operations respectively. During an operation the stop-bars 125 are released for differential movement by displacing a transverse rod or bail 144, Figs. 3, 25 and 26. The rod 144 is mounted on arms secured to a shaft 146 operatively connected to a shaft 151 itself connected to a lever 155 co-operating with a cam 158 on the main shaft 70. The shaft 151 is also connected to a shaft 161 carrying a transverse rod 162 similar to rod 144 to engage a finger on the horizontal arms of the upright bars 22. Transfer mechanism. The transfer or carryover slides 115, Figs. 16, 17, 18 and 37, are normally maintained in a lowered position against the action of springs 117. This is effected by a stop 118 on corresponding release shafts 119 pivoted in the frame of the totalizing counter units. When a totalizer slide 16 reaches its limit position an indent 19 thereon acts to rotate its release shaft and withdraws its stop 118 from the bent edge 115d of the transfer slide which is thereby free to move and rises to an upper position by the action of the slopes 115b, 115c on the guide rollers 103. By this means the pins 113, 114 on the associated pawls 109, 110 and lever 107 are raised; the pin 113 releases the pawl 109 from engagement with the finger 22e of the upright bar 22 causing the release, thereby permitting the totalizer slide 16 to return until a projection 22f on the upright bar contacts with the pivot 112 of the pawl 109; at the same time the pin 114 imparts an additional step movement to the upright bar 22 of the next higher denomination. A connection is provided between the slide 16 of the highest denomination and a slide 116 associated with the units denomination by arms 123, 120 on a shaft 121 in order to take care of the " fugitive one." Return of displaced transfer slides 115 is effected by transverse bars 167, 168 carried by shafts 165, 166 in operative association with a cam 177 on the main shaft 70. Subtraction. The frame 128 carrying the differential stop-bars 125 is supported on links 131, Fig. 12, and is normally held to align the toothed members 127a, 127c with the key stems for addition. On depression of the subtract key S in the operation control key bank 225 the frame swings under spring action 'to align the toothed members 127b, 127d with the key stems and during an operation subtraction is effected by adding the complement with respect to " 9 " and entering the " fugitive one." Key detent and interlocking mechanism. The key stems of the selection key banks 73 are notched to co-operate with detent flaps 77, 78, Fig. 15, connected together by a spring 81. The keys 133 of the amount banks co-operate in a similar manner with detent flaps 136, 137, Fig. 23. The flap 137 has a finger 138 which acts on a lever 139, Fig. 22, pivoted on the key support frame 135, and serving as a zero stop to prevent movement of the differential stop-bars 125 of denominations in which no key is depressed. The frame 135 has a projecting tooth 135b to co-operate with a projection (not shown) on the stop-member 127a when the stopbar frame is moved to the subtract position, thereby eliminating the action of the zero stops to allow a differential movement to the full extent when no key is depressed. A bar 178 slidably mounted on the keyboard frame 135 co-operates with the fingers 138 and with fingers 182 on the detent flaps 136 to effect locking and release of the depressed keys. The movement of the bar 178 is controlled from a shaft 190 adapted to receive a rotational movement as well as a longitudinal displacement. The shaft 190 is normally retained in the Fig. 4 position by a pin 194 on the bail member 58 engaging a collar 195. The rotative movement of the shaft 190, in one or other direction, is controlled by a driving-block 196 thereon, Fig. 27, and cam surfaces 199, 200 on a slide 201, co-operating with a cam 204 on the main shaft 70. The shaft 190 also serves to lock the release shafts 119 of the totalizer units. For this purpose each shaft 119 has an arm 206 to co-operate with a pin 208 on a slidable bar 207, a roller 209 on which is acted upon by a cam ,210 operatively connected by a linkage to a roller 216 in engagement with an arm 217 on the driving-block 196. With these parts in the position shown in Fig. 4, the release shafts 119 of the section A<SP>2</SP> are locked. A similar mechanism co-operates with the shaft 190 in its displaced position to lock the release shafts of the section A<SP>1</SP>. The longitudinal position of the shaft 190 is determined by levers 221, 222, Figs. 4 and 12, coacting with collars 219, 220 on the shaft 190 and settable by the control keys of the keyboard. Operation control keys. These keys 225 are arranged in a bank and are associated with a differential stop-bar 50<SP>1</SP> which is similar to the stop-bar 50 associated with the selection key banks 73. The subtract key S on depression lowers a slide 233, Figs. 2 and 9, to rock levers 234, and 238. The lever 238 releases the frame 128 of the differential stop-bars 125 to the action of a spring 241 which m