Patent GB-462686-A (GB)
Abstract: 462,686. Cash registers. NATIONAL CASH REGISTER CO., Ltd. (National Cash Register Co.) Sept. 13, 1935, No. 25425. [Class 106 (i)] Controlling printing of zeros.-In a cash register or similar accounting machine wherein the differential member associated with each amount bank is moved to maximum extent to print a zero (or asterisk), a totalizer actuator for the bank is uncoupled from the differential member in such an operation to avoid the addition of an erroneous amount to the totalizer wheel engaged with the actuator. The invention is described as applied to a machine having zero-eliminating means of the kind described in Specification 458,114, wherein each amount type-wheel, Fig. 14, has an asterisk in the first position, and a zero in the eleventh position, zeros being selected for printing to the right of the highest significant figure by the disabling of the zero stop-pawls of the associated banks. The provision of a totalizer in the present machine necessitates means to prevent the addition of ten units to a totalizer wheel associated with a differential member that is freed for maximum movement to set up a zero for printing. For this purpose each differential member is normally coupled to an actuator segment by a latch that is disabled upon the arrest of the differential member by the zero stop-pawl. Now upon the subsequent disablement of the zero stop-pawl in an operation in which a zero is to be printed, the differential member moves to maximum extent but leaves the actuator in zero position. The zero stoppawls 46, Figs. 4 and 5, may be disabled by depression of keys in the associated banks or, during the machine operation, by cams 105 on a shaft 106. Depression of a key, through a cam plate 41, link 44 and the abutting oblique faces of studs 98, 99, rocks the appropriate pawl 46 to disabled position, and at the same time positions the foot 44<a> of the link 44 in the path of one of the cams 105. During the operation, the cam rocks the link 44 and owing to the shape of the abutting faces of studs 98, 99, the zero stop-pawl is rocked further from effective position. This movement, through a stud 100 on the pawl, and a stud 101 on the link 44 for the bank of next lower denomination, disables the pawl for that denomination. The cams act in succession from the highest denomination with the result that the zero stop-pawls of all banks of lower denomination than that in which a key is depressed are disabled during the machine operation. The differential 49, Fig. 5, for each bank carries a latch 48 pivoted on a stud 86 and urged clockwise by a spring 114. Each differential is provided with a driving spring 53 under the action of which it follows the clockwise excursion of a bail 32 until arrested by the abutment of the latch with the zero stop-pawl or the stem of a depressed key. An actuator 55 for a totalizer wheel 56 is held in its initial position by a spring detent 110 and is driven by a shoulder 113 on the latch, which shoulder engages a lug 112 on the actuator after one step of movement of the differential. The abutment of the latch with the pawl or a key, swings the latch counterclockwise to remove the shoulder 113 from behind the lug 112 and engage it with a notch 117 in a disc 116 rigid with the actuator, whereby the latter is locked. In an operation in which an asterisk is to be printed, the latch is disabled by the zero stoppawl, thus arresting the differential after one step of movement and locking the actuator in its initial position. However, in an operation in which a zero is to be printed, the zero stoppawl is later disabled by the cam 105 in the manner previously described, the latch rocks clockwise to position the shoulder 113 ineffectively to the left of the lug 112, and the differential moves to maximum extent leaving the actuator still in its initial position. Specification 456,529 also is referred to.