Patent GB-273691-A (GB)
Abstract: 273,691. National Cash Register Co., (Assignees of Shipley, B. M.). June 30, 1926, [Convention date]. Adding and subtracting apparatus; cash registers; printing totals and sub-totals. - One unit is added to the negative side of the adding and subtracting totalizer of a cash register as a preliminary to a negative total-taking operation,- by the depression of a negative balance correction key provided to control the taking of the total. This hey is normally locked against depression by means only disabled by (a) a negative balance standing on the totalizer, (b) the totalizer being in subtracting position, and (c) the total-taking member being in the total-taking position corresponding to the totalizer line. " Transfer " mechanism adds the one unit to the negative side of the totalizer as a preliminary to a negative total-taking operation, the totalizer being left in engagement with its actuators at the end of an adding or sub-total taking operation, and disengaged from them at the commencement of each operation of the machine. Means are provided for connecting the totalizer to the regular engaging mechanism. Release of the machine by any key other than the negative balance correction key is provided. Control of negative total key by totalizer. When a negative balance is on the subtracting wheels of the totalizer, two cams one connected by a sleeve to the adding wheel of the highest order unit of the totalizer, and the other connected to the first by bevel gears, ring a bell and the second cam has attached to it a cam that engages an arm fast to a shaft 263. At the other end of this shaft is a lever 267 connected to an arm 268 by a yoke 269 normally lying in the path of a pawl 271 pivoted to a detent 240 actuated by a negative balance correction key 46, so that the key 46 cannot be depressed to release the machine until the lever 267 is rocked. If the subtracting wheels are not in engagement with the actuators, a downwardly extending part 270 of the yoke 269 is in the path of the pawl 271 and prevents depression of the key, even though the yoke has been rocked. Control of negative total kev by total-taking lever. The key 46 cannot be depressed until the total-taking lever 215 has been moved to select the adding and subtracting totalizer, or while it is in position for taking a sub-total. A slot 284 in the lever plate 216 guides a roller 283 on a lever 280 carried by a shaft 281, so that when the roller enters an enlargement of the slot, the lever 280 moves into the path of a pin 285 on the detent 240. Adding fugitive one. When the key 46 is depressed, a pin 241 on the detent 241 engages a hooked lever 242 whereby a lever 245 is rocked counter-clockwise and a lever 247 carries a pin 235 out of engagement with a shoulder in a slot 236 in a transfer stop arm 233 to allow the stop arm to be pulled clockwise by a spring 234. A stud on the transfer arm is thus freed from the end of the stop arm and bears against a shoulder 236<1>. This " transfer " mechanism thus adds one unit to the totalizer on release of the machine. Preventing release of negative. control key. Release of the key is prevented until the end of the operation by a lever 286 having a tooth 288 that is drawn into engagement with the detent 240 when the key is depressed. A hook 287 on the lever 286 is engaged by the shaft 263, which is carried by a shaft 138 supporting the totalizer shaft 135, to release the detent when the totalizers are disengaged. Preventing release of machine by other control keys. An arm 296 passes into the path of an ear 297 on the release shaft 39 when the lever 267 is rocked on the negative side of the totalizer passing over zero to bring a projection 299 out of the path of a pin 298 on the arm, and when rocking of the shaft 281 by the operation of the totaltaking lever removes an arm 294 from the path of a shoulder 295 on the arm. Operation of the detent, however, causes a pin 303 to strike a lever 301 connected to the arm to allow release of the machine. Controlling engagement of totalizers with actuators. The means for leaving the totalizer engaged at the end of all operations except totaltaking comprises a lever 180 loosely mounted on the shaft 138 and connected at one end to a link 160 actuated by the regular engaging mechanism. The other end of the lever 180 carries a pawl 181 adapted to engage a pin 183 carried by a lever 184 secured to the shaft 138 when the lever 184 is moved clockwise by a link 185. This movement takes place at the beginning of the first cycle of the operation by a hook 192 loosely mounted on a shaft 189 being given a, counter-clockwise movement controlled by a cam 199, a lever 196, and a link 195. The lever 184, at the point where it is connected to the link 185 carries a roller running in a cam slot 191, and thus the shaft 138 is raised to disengage the totalizer, but the levers 180, 184 are locked together by the pawl 181 and when the spider 165 moves clockwise, the totalizer is pulled into engagement, the link 185 being driven to the right. The downward movement of the link 160 causes a lever 220 to move counterclockwise to rock a plate 188. This plate has a curved slot 187 in which a stud carried by the link 186 moves, but when the plate is rotated, the stud 186 rides up an extension 225 of this slot, and is thus moved out of the path of the hook 192 when it moves to the left during the second cycle of the machine. The latching mechanism is also broken just before the end of the operation by an arm 205 on the release shaft engaging a pin 206 on an extension of the pawl 181, so that the return of the link 160 does not disengage the totalizer. After a negative balance has been taken, a blank operation is performed to clear the totalizer and set the adding wheels at zero.