Patent GB-199813-A (GB)
Title: Improvements in and relating to totalizer zeroizing arrangements for cash and other registers
IPC: G06C7/10
Filed: 1922-03-29
Abstract: 199,813. Haddan, A. J. H., (National Cash Register Co.). March 29, 1922. Cash registers; interlocking; zeroizing-mechanism. - Relates to zeroizing-mechanism for the totalizers and comprises interlocking means between the main operating shaft and the resetting knob preventing the operation of either if the other is in action. The main operating means is of the type requiring an initial backward movement to free it and this initial movement is used to lock the zeroizing-mechanism. The main shaft 27 carries a pinion 26 geared to the crank and having a stud 175 normally resting in a locking groove in a lever 177 controlled by a spring 194 through a link 192 and having two steps to engage a stop 181 pivoted at 179. Also loose on the pivot 179 is a three-armed lever 180 engaging the pinion 26, the initial backward jerk of which rocks the lever 180 to bring a pin 182 against the stop 181 and displace it so as to free the lever 177 and disengage the pin 175 allowing the machine to be operated. At the end of the operation the pin 175 re-enters the groove and re-locks the machine. A fixed pin 185 limits the motion of levers 181 and 180 thus preventing backward motion of the main shaft. The totalizer wheels 82, Figs. 4 and 5, and the transmission pinions 93, 95 and 63 are mounted on spindles carried in a frame 84, 85 and borne on the centre spindle 87 which slides in slots 88 in fixed side plates 89, 90, the frame being guided in and out of gear with the differential segments by slots on the frame engaging guides 79. This gearing movement is effected by cams 108, 109, lever 105, and link 103 rocking an arm 102 on the spindle 87 which arm has a roller 101 engaging a cam groove 100 in the fixed plate 89. A similar arm 113 on the other end of the spindle engages a similar cam slot. The spacing of the differential segments set by the keys is accommodated to the spacing of the totalizer element by mounting the corresponding pairs 95, 63 of the transmission element on sleeves on the hollow spindle of the totalizer frame. To zeroize the totalizer, the frame is displaced sideways against the action of a spring 157 by pulling on a milled head 155 on the spindle 83 which is grooved to pick up pawls on the counter wheels, a lug 159 being provided fast on the spindle to fit normally in a slot 160 in a fixed plate 161, and to drop back into the same after displacement for zeroizing, this also ensuring complete rotation. A comb 406 pivoted on shaft 88<a> is spring pressed against a stud 407, Fig. 4, to bring its teeth 408 in the path of pins on the counter wheels to stop them at zero, and a projection 409 in the comb engages a fixed pin 410 so as to remove the teeth when the counter is being actuated. The lug 159 has a groove 190 adapted to receive a pin 189 on a lever 188 rocked by a pin 191 on the main-shaft locking lever 177 when the latter is rocked to allow operation of the machine, the displacement of the spindle 83 for zeroizing being thus prevented. During zeroizing the pin 189 encounters a collar 839 on the spindle 83 thus preventing the initial movement of the lever 177 to unlock the machine. The machine has the differential mechanism described in Specification 8119/15, and the aligning mechanism for the totalizer wheels described in Specification 200,039.