Patent GB-203998-A (GB)
Title: Improvements in and relating to indicator mechanism for cash registers
IPC: G06C11/02
Filed: 1922-06-09
Abstract: 203,998. Haddan, A. J. H., (National Cash Register Co.). June 9, 1922. Cash registers with operating-means; differentially-moved and tablet indicators. - The tablet indicators are arranged in carriages which are differentially positioned, to bring the required tablet into the plane of the exposing device, by connection with the key-controlled differential mechanism through a cam slot and pin mechanism combined with a minimum movement arrangement. As in Specification 8120/15 the tablets 400 corresponding with the keys in any one bank are duplicated to show to the front and rear and are slidably mounted in a corrugated casing 398 supported by a carriage 1396 riveted to a lever 412 pivoted at 217. The duplicate carriages are coupled together by means of nested sleeves arranged on a shaft 423 and connected by tenons at their ends with hubs provided with teeth 421 meshing with racks on extensions 402 of the carriages. The carriages are differentially positioned from the differential actuator 222 by means of an eccentric slot 410 formed in a plate 409 and engaging a pin 411 on the lever 412. The plate is controlled in movement by a bifurcated beam 403 embracing a pin 408 on the plate and pivoted at 404 to the differential actuator 222. As the latter is moved to its differential position corresponding with the value of the' depressed key, the beam 403 moves rcund with it and positions the lever 412 and carriage accordingly. On the return of the actuator to normal position the indicator parts remain in their set position and at the next operation of the machine the pivot 404 which is free to follow the differential movement of the actuator takes up the new setting. Subsequently a roller 413, operated by cams on the main shaft, engages the beam and moves it into contact again with the shaft 159 thus shifting the indicator carriage direct to the new setting without first returning it to normal. The plate 409 is toothed at 452 for engagement by an aligning bar 444 carried by bell-cranks 442 controlled from the main shaft through shaft 227, and aligning means for the carriages 1396 are further provided by pawls 455 co-operating with teeth 454 on the carriages and carried by arms 461 one of which is rocked by pin and cam slot connection with one of the bell-cranks 442. The means for exposing the tablet selected comprises a lifting bar 476 provided with lugs to engage recesses in the tablet and operated by connection through gearing with the transfer-operating shaft 362 which rocks first clockwise thus returning any exposed tablets to normal position before actuation commences, and after actuation has ceased, counterclockwise to expose the newly-selected tablets. In total and sub-total taking operations the indicators, corresponding with the total as discharged into the actuating mechanism, are exposed and to provide for this when the total exceeds the highest amount that can be entered in the machine, additional indicators are arranged to the left of the highest amount bank. Specifications 203,994, 205,436, and 206,798 are also referred to.