Patent GB-819544-A (GB)
Title: Improvements in cash registers and similar accounting machines
IPC: G06C7/10
Filed: 1957-01-15
Abstract: 819,544. Cash registers. SVENSKA DATA-REGISTER A.B. Jan. 15, 1957 [Jan. 23, 1956], No. 1506/57. Class 106 (1). A calculating-machine or cash register of the independently operated type has, for each denomination, a pair of differential elements directly coupled with two setting members movable from normal positions in opposite directions to differential positions determined by a depressed key or the like and back again to their normal positions during each cycle, one of a denominational group of totalizer wheels being engaged with one of these setting members either during the setting stroke or the resetting stroke so as to perform addition or subtraction, and a third member controlled by the said two setting members and itself setting indicating and printing mechanisms. The cash register shown has four lines 51 of interspersed totalizers. Differential mechanism.-Each order comprises an actuator rack 2 for the totalizers, an auxiliary rack 4 and an indicator rack 3 geared to indicator drums 34, 35 and to a type-setting gear 40. The indicator mechanism is of the minimum-movement type, the rack 3 having lugs 9 and 10 on its opposite sides which are respectively engaged by offset portions 7, 8 of the racks 2 and 4 as they are moved together so as to move the rack 3 directly from its old setting to a new one. The racks 2, 4 are moved together by arms 17, 18, the upper ends of which engage notches 13, 14 in the racks and the lower ends of which are pivoted at 19. Oppositely-formed cam slots 20, 21 in the arms are engaged by a roller 22 carried by a link 23 connected to a cam-operated lever 25. Initially, Fig. 1, the racks 2, 4 are in extreme lower and upper positions respectively but in a machine cycle, the upper ends of the arms 17, 18 are moved together, Fig. 2, in which position the stem of the depressed key, e.g. the " 9 " key, is embraced by a pair of lugs 5, 6 on the racks 2, 4. The arrangement is such that the rack 2 moves an amount proportional to the digit to be entered. The key stems of each order are arranged in three groups of three and the racks 2, 4 each have three corresponding lugs 5, 6. An additional rear lug 5 of the rack 2 co-operates with a zero stop A‹, Fig. 1, which is normally effective but is cammed upwardly by a bar B when any amount key in the same order is depressed. A locking bar 41 normally engages gears 33 coupled to the indicator racks 3 but is disengaged by cam means during the re-setting movement of those racks. Total- and subtotal-taking.-Depression of a total key 62, Fig. 10, shifts the shaft 51 of the corresponding line axially so that spring-loaded balls 76, see also Fig. 12, mounted in the shaft are shifted from alignment with the wheels of an unselected one of the interspersed totalizers into co-operation with the totalizer in effective position, i.e. in alignment with the racks 2. The balls 76 are arranged to engage recesses 77 in the totalizer wheels as the shaft 51 is rotated clockwise and so to rotate the wheels from their previous positions on to zero positions determined by the abutment of large teeth 78 against a stop 79. At the same time the links 23 of the differential actuating mechanism are raised to enable the totalizer racks 2 to assume positions corresponding to the total and to drive the indicator racks 3 accordingly. The shaft 51 is rotated by a gear 61 thereon which, when the shaft is shifted axially moves from alignment with fixed racks 81, 82 into alignment with racks 54, 83. When the shaft 51 is raised to engage the totalizer, the gear 61 engages the rack 54 which is driven by cam means, Fig. 8 (not shown), to rotate the shaft 51. In subtotal-taking, the totalizer remains engaged to receive back the total amount from the racks 2. In this case, the shaft 51 is rotated back to its initial position by the rack 54 as it is restored. However, in total-taking, the totalizer is disengaged prior to the return of the racks 2 and in this case the shaft 51 is rotated back by the rack 83.