Patent GB-244658-A (GB)
Abstract: 244,658. Brewer, G., (Krupp Akt.-Ges., F.). Jan. 19, 1925. Cash registers with operating-means; printing totals; transfer mechanism.-In a cash register or other calculating-machine having a totalizer capable of adding and subtracting and of conveying the amount upon it through the actuators to the printing mechanism, a correct negative total is obtained automatically by means of a transfer action from the highest to the lowest denomination but such transfer action is prevented when the passage of the highest numeral element through the transfer point arises from the capacity of the totalizer being exceeded. The invention is described as applied to the machine of Specification 244,601 provided with two adding and subtracting totalizers shown one above the other in Fig. 2. The add and subtract pinions constituting the denominational elements of the counter and intergeared by a reversing pinion 226 are actuated by pinions 164, 165 which mesh with the differential rack 80 and the receiving wheel 214 and axe carried by the lever 163 controlled by the next lower denomination. Transfer is effected by a clockwise rocking of this lever produced by a spring 198 acting through an arm and link 194 when the pivot 192 has been thrown over the dead centre by the tripping of the tooth 233 connected through toothed sector 188 with pinion 191 rigid with arm 193 carrying the pivot 192. A similar transfer mechanism is provided for the lowest denomination and is under the control of the transfer tooth of the highest denomination through a rock shaft 244 and duplicate sets of arms 241, 245 and slotted links 243. At one end of shaft 244 is a loose non-reverse ratchet-wheel engaged by a pawl carried by an arm fast on the shaft. The hub of the ratchet wheel is provided with a pair of gear wheels one of which, namely 259, Fig. 5, controls sets of stops 267 and the other positions a cut-away disc 265, Fig. 6. The stops are in pairs in staggered relation and are spaced so that when the rider axle 224 is in additive position an arm 268 is in the plane of one pair while under subtractive coniditions it cooperates with the other pair. When additions are being made and the capacity of the totalizer is exceeded the transfer tooth of the highest denomination tends to rock the shaft 244 but owing to one of the stops engaging the arm 268 this shaft is prevented from rotating and therefore no addition to the lowest denomination occurs. When, on the other hand, the totalizer is in subtractive condition and consequently the arm 268 is positioned in the plane of the other pair of stops the staggered relations of the stops will permit a quarter turn of shaft 244 and thus the addition of unity when the highest denomination changes from 0 to 9. Any subsequent passages of the highest element through zero due to the capacity being exceeded will however not affect the lowest denomination owing to the shaft 244 now being held by the arm 268. The engagement and automatic change of condition of the totalizer in total-taking are effected by plunger slides 322, Fig. 12, and 316, Fig. 10, respectively the movements of which towards the left are permitted or prevented by cut-away discs 405, 409, and 406, 410. The engagement-controlling slide 322 is free only when a special key rocks disc 409 and the transaction differential mechanism turns shaft 274 so that cut-away portions of the fast and loose discs 405, 409 may be presented to the lug 425 of the slide. The disc 406 fast on a shaft 274 presents a gap to its slide 316 (determining the add or subtract condition of the totalizer) whenever the special key is depressed but the adjacent disc 410 is capable of adjustment to mask the gap to prevent change of condition. This disc 410 is controlled by a spring and is connected with disc 406 by a pin and slot 413. Below the discs is a yoke 419 connected to a pitman 421 having a pin 423 to co-operate with the cut-away discs 265 previously referred to. One arm of the yoke bears a pin 418 standing in the path of a lug 417 on the disc 410 and the arrangement is such that when the shaft 274 is rotated bv the transaction differential mechanism the disc 410 turns with disc 406 throughout the movement provided the pin 418 yields to lug 417. Consequently if a gap is presented to pin 423 by disc 265, that is, if the amount on the totalizer is positive, the disc 410 is not interfered with and so executes its function of masking disc 406 and therefore of maintaining the totalizer in additive condition. On the contrary, if the total is a negative one the disc 265 presents its periphery to the pin 421 so that the lug 417 is obstructed and the disc 406 is unmasked to allow the slide 36 to shift the rider axle into subtractive position. The control slides 316, 322 are connected bv the mechanism shown with shaft 311 and a sleeve 318 thereon respectively. The shaft is connected with the rider shaft 224 and is provided with a pair of stepped stops 309, 310, Fig. 11, and the sleeve 318 is furnished with similar stops 323, 324 and a further stop 325 spaced from the sleeve but con. nected with it by a yoke. At each operation of the machine an arm 298, Fig. 13, slides a lug 295 to drive the sleeve and therefore also the shaft 311 to the right. The rotary positioning of these members by the slides 316, 322 with respect to one another and a fixed stop 317 determines through the stops the extent of axial movement imparted by the lug to the shaft 311 and therefore the position of the rider relatively to the counter. The lower (grand) totalizer is controlled for yielding its total by means of two keys namely +b and -b, the key employed depending upon the sign of the total. In order to prevent depression of the inappropriate key, connections are made from these keys to two rocking bails 430, 431, Fig. 16, co-operating with the disc 265 for the grand totalizer. When the latter is in negative condition the bail of the positive total-taking key, +b is blocked and only the negative key -b can be depressed, and vice versa. The positive or negative character of the total taken is recorded by type adjusted by a link 439, Fig. 16, pivoted to a bell-crank lever 441 carrying a roller 440 bearing against a grooved rotary cam 443. Rigid with the bell-crank lever is an arm 437, Fig. 10 connected by pin and slot with slide 316. Thus according as the total is positive or negative and the slide is stationary or displaced to the left, so the roller is prevented from entering the groove in cam 443 or is free to do so in which case it is retained in the groove during the operation of the machine and the corresponding sign is printed against the total.