Patent GB-1174531-A (GB)
Title: A Cash Register Accounting Machine and the like
IPC: G07G1/06
Filed: 1968-02-05
Abstract: 1.174,531. Accounting machines. NATIONAL CASH REGISTER CO. 5 Feb., 1968 [27 Feb., 1967], No. 5591/68. Headings G4B and G4T. An accounting machine or the like has a plurality of apertured programming matrix plates 26 differentially movable under the control of selectively operable control keys and sensing pins 27 reading aligned apertures in the matrices to control the programme carried out by the accounting machine. As described, each matrix plate contains large holes 28 and small holes 29 divided into five divisions to control four totalizer lines A-D and a printing mechanism P, Fig. 14. Each division A-D is divided into three zones, zone 1 controlling the lateral position of a totalizer line zone 2 the zeroizing cycle of a totalizer and zone 3 the adding cycle of a totalizer. Division P is divided into zones 1-3 controlling a journal printer, slip printer and receipt printer. The accounting machine has three banks of control keys, each bank moving a pair of matrix plates through a differentially set rack 40, one matrix plate being located in a neutral position whereby only one matrix plate is effective at a time, Fig. 5. Each rack 40 drives a gear 36 having an enlarged tooth 62 and cutout portions 60, 61 co-operating with lugs 56, 57 on racks 44. Each rack drives one matrix plate 54 or 55 through a depending pin 52. The first five control keys drive one rack 44 one to five steps, the projection 56 being accommodated in the cut-out portion 60. The remaining control keys move said one rack 44 six steps to a neutral position and out of the range of gear 36 and the other rack 44 one or more steps following the engagement of the large tooth 62 with a corresponding gap in the rack teeth, the projection 57 being accommodated in the cut-out portion 61. Mounted on a pin cage assembly are spring-loaded sensing pins 27 passing through apertures 72 and aligner pins 80, Fig. 9. The pin cage assembly is supported by studs 67 from drive links 70 controlled by a main cam-shaft. The cage assembly is raised initially to allow the positioning of the matrix plates then lowered, bringing the pins 27 and 80 into contact with the plates. An aligner plate 100 is also operated from the main cam-shaft to contact the pins 52 and the aligner pins 80 pass through aligned apertures in the matrix plates to maintain the matrix plates in aligned position. The sensing pins 27 pass through large holes 28 aligned in the matrix plates to protrude from the underside of the matrix plates and are sensed by spring-loaded feelers 123 and 124 rotatably mounted on shaft 121, Fig. 16. The feelers 123 and 124 are moved initially in an anti-clockwise direction by studs 138 on a link 130 driven from the main camshaft whereby totalizer control arms 142 mounted on the feelers engage links 143 and 144, corresponding feeler 123, 124 being arrested by protruding sensing pins. Link 130 is restored to its original position and releases the spring- loaded feelers 123 and 124 which attempt to return to the upright position. However, selected feelers are arrested by sensing pins 27 and their totalizer engaging control arms 142 remain in contact with associated engaging links controlling totalizer timing. A drive mechanism operating from the main cam-shaft is used to actuate the engaging links 143 and 144 in reset and add timing, respectively, rotating the control arms 142 in a clockwise direction, thereby rotating shaft 121 and raising the totalizer support member to bring the selected totalizer into contact with the differential racks. A link 201 is moved to the left at the end of each totalizer operation to restore the totalizer racks to their rest position. A further sensing operation is performed to align a particular set of wheels in the selected totalizer shaft with the differential racks by co-operating lower slides 157 and upper slides 164 mounted on a guide plate 147, Figs. 2 and 19. Cams move the upper slides to the left and the lower slides to the right to embrace zone 1 of the matrix plates and then the slides move in the opposite directions to grip protruding pins between jaws 173 and 174 and position totalizer support members 175 accordingly. A set of stepped, rotatably mounted, control feelers is used to contact the feelers in division P of the matrix plates and thereby control operation of the printers.