Patent GB-445504-A (GB)
Abstract: 445,504. Calculating-machines. FAIRWEATHER, W. C., 65, Chancery Lane, London.-(Underwood Elliott Fisher Co.; 342, Madison Avenue, New York, U.S.A.) June 15, 1935, No. 17283. [Class 106 (i)] A typewriting-computing machine has several totalizers, each having a set of differential actuating racks with which a set of idler pinions are continually meshed, means being provided to engage the totalizer pinions either directly with the racks for addition or with the idler pinions for subtraction. Each totalizer can be engaged independently of the others. The engaging means are controlled both by the typewriter carriage and also by over-riding manual control devices. The invention is shown applied to a machine of the kind described in Specifications 369,801, [Group XVI], and 411,291. When the paper carriage enters a computing zone, cams 60, Fig. 2, on the carriage depress rods 61 connected by levers 62 to bows 59 which lift rods 58 into operative positions with respect to rack bars 44. One or more bows may be selected in each zone and each bow is associated with one totalizer. When the units figure is being typed, a rod 58 advances slightly the units differential actuating rack 44, a cam on the carriage depressing a rod 54 connected to the rod 58. The carriage is then advanced to the tens position where it advances the tens rack, and so on. Each numeral key is arranged to depress a corresponding bar 41 which pushes down a stop 43 in that rack 44 at this time advanced by its rod 58 to align the stops and the bars 41. When the main shaft is operated, a general operator bar 79 is advanced longitudinally to engage the set stops and thus advance the racks 44 differentially. Before the bar 79 engages a stop, the bars 44 are aligned by the swinging of a blade 256 by a pin 264 on a lever 261 which is rocked by a lever 248 connected to the main operating means. Adding and subtracting apparatics.-Each totalizer comprises pinions 46 and wheels 47 pivoted on a shaft 94, Fig. 1, mounted in a frame 96, 97. The frame can be moved downwards by an arm 103 to mesh the pinions 46 with the racks 44 for addition, or the frame can be moved horizontally for subtraction by links 108 to engage the pinions with the idler pinions 48 always meshing with the racks 44. A shaft 104 is rocked from the main shaft and is connected either to the arm 103 or to the links 108 by a coupler 109 controlled by a slide 137. The coupler is rocked from the shaft 104 by a key 114 and in the right-hand position of the coupler a lug 111 upon it engages the arm 103 to cause addition, while in the left-hand position a lug 112 engages a bail 106a carrying the links 108 to cause subtraction. Carriage control of adding and subtracting apparatus. When the carriage enters a computing zone and one or more bows 59 are rocked, for each bow a latch 126, Fig. 9, is lifted to release a slide 124 which is then pulled forward by a spring 125 until stopped by a second latch 132. The slide 124 has a cam slot 138 engaging a projection on the slide 137 whereby the latter slide is moved to the right to set the coupler 109 to cause addition in the corresponding totalizer. In certain zones, another carriage cam moves a link 166 to the left to free a lever 162 which is then rocked by a spring 163 to turn a shaft 149 which lifts all the latches 132. The slides 124 thereupon move forward another step and the cam slot 138 shifts the slides 137 to set the couplers 109 and thus all the carriage-selected totalizers for subtraction. The slides 124 are restored by a bar 176 moved by a shaft 212 which is rocked towards the end of the return stroke of the operating bar 79 by an arm 214 and link 215 having a shoulder 218 engaged by the bar 79. Just before the end of the stroke, the link is freed from the bar by being depressed by a lever 244. Manual control of adding and subtracting apparatus. Subtraction may be caused in a totalizer selected by the carriage for addition. To this end, a key 148 is pressed and, through connections 152, 156, 155 rocks the shaft 149 to withdraw all the subtraction latches 132. The shaft 149 is held by a latch 158, 250. Any totalizer which has been selected for operation by the carriage or by the carriage and the subtraction key 148 can be rendered inoperative by depressing an elimination key 190. This pulls forward a slide 197 which has a cam part 207 engaging a roller 206 to rock anticlockwise a lever 203 co-operating with a pin 204 on the slide 124. The lever 203 and the slides 124, 197 are temporarily latched by the engagement of the roller 206 in a notch 209 of the lever 197. A totalizer which has been selected for subtraction may be caused to add or may be rendered inoperative, and one selected for addition may be rendered inoperative, by adjusting a key 310, Fig. 19. The key lever 311 pivots about a vertical axis 317 and has a projection 312 engaging one of three notches 313. An arm 318 of the lever 311 is thus adjusted to retain the slide 124, 135 in inoperative, adding or subtracting position. Clear marks.-When all the totalizer wheels stand at zero a bail 323, Fig. 20, rocks clockwise from beneath an arm 325 on the stem of a key 320, which can thus be depressed to rock a shaft 331 which causes a star to be printed. The key 320 is locked when the slide 137 is displaced from its neutral position to mesh the totalizer pinions with the racks or the idler pinions, since a projection 328 on the key stem cannot then enter a notch 327 in the slide 137. Minimizing noise. The bar 79 is provided with spiral springs 88, 91, backed by resilient material, on those faces which contact with the stops 43 or the bar 44.