Patent GB-346465-A (GB)
Abstract: 346,465. Checking receipts. NATIONAL CASH REGISTER C O., Dayton, Ohio, U.S.A.- (Assignees of Shipley, B. M. ; 2021, Catalpa Drive, Dayton, Ohio, U.S.A.) Jan. 16, 1930, No. 1564. Convention date, Jan. 23, 1929. [Class 106 (i).] Cash registers.-In adding and total-taking mechanism for cash registers of the key set and operated type, the movement of the key coupler is transmitted flexibly to the main shaft during adding operations and positively during totaltaking operations. The key coupler, Figs. 2, 5, and 13, is formed in two rigidly connected parts 42, 175 and rocks about pintles projecting from the side frames of the machine. A shaft 176, in alignment with the pintles, is flexibly connected to the key coupler by hooked members 179, 180, the ends 181 of which are pressed into engagement with an overhanging edge 185 of the key coupler by compression springs 183. The main shaft 116 is connected through pinion 194, driving-element 190 and arm 191 to the shaft 176 and is rotated through one revolution during each operation of the machine. During the depression of a key, the upper rack 192 of the driving-element 190 is held in operative engagement with the pinion 194 by the sliding abutment of a projection 201 with the underside of a guide 202. Upon the release of the key, the lower rack 193 is moved into engagement with the pinion by a spring-urged lever 203 and the projection 201 returns in abutment with the upper side of the guide 202, the parts being finally urged into their original position by a lever 195. The main shaft is locked in the two extreme positions of the element 190 by the engagement of fingers 198, 200 on the arm 191 with a recess in an aligner disc 199 on the shaft. During an adding operation, the drive of the main shaft is cushioned by the springs 183, but during a total-taking operation the drive is positive, the springs being rendered inoperative by a member 280, Fig. 11, connected to the total-taking key and directly engaging an extension 279 of the hooked member 180. Differential mechanism. The keys in each bank are provided at their inner ends with differential cam slots 47, Figs. 2 and 3, adapted to position a bail 48 angularly with respect to its supporting shaft 51. The bail is carried by toothed segments 49, 50 that mesh for stiffening purposes with pinions 56 rigid with a freely mounted shaft 58. The movement of the differential bail is communicated through the segment 49 and a forked driver 70, having an adding rack 72 and a total-taking rack 73, to the pinion 78 of a totalizer actuator 79. The driver 70 is provided with flanges 74, 81, Fig. 8, engaged by a cam 76 fast on the shaft 77 and normally operating to hold the adding rack in operative position. Overthrow of the actuators 79 is prevented by stops 87 carried by the key coupler into engagement with the teeth of the actuators. A zero stop arm 61, Fig. 13, normally prevents rotation of the differential bail 48, but is disabled upon depression of a key by its connection to a bail 63 straddling the keys of the bank. Totalizers. The totalizer, Figs. 2 and 4, comprises a number of pairs of gears 82, 83 mounted in a shiftable frame 92, the movements of which are constrained by a shaft 94 movable within a slot 96 in a fixed plate 97, and by a fixed rod 103 embraced by slots in the frame. The totalizer is engaged with the actuators 79 at the commencement of each operation and disengaged prior to the return of the actuators. For this purpose, the shiftable frame 92 is connected through arms 99 on the shaft 94 to rollers 98 movable in a cam slot 100 in the plate 97, and the arms 99 are operatively connected to cams 117, 118 on the main shaft. The gears 83 are aligned by spring-urged detents 113 that, during actuation of the totalizer, are disabled by arms 111 which project from the shaft 94 and enter cam slots 112 in the detents. The cam slots 112 are recessed at their forward ends to permit the detents to rise during transfer. Transfer mechanism. A tooth 130, Figs. 2 and 4, on the totalizer gear of lower order is adapted to wipe past a projection 131 on a pawl 132 pin-andslot connected to a bell crank 137. A flattened stud 139 on the bell crank is thereby removed into the lower part of an opening 142 in one arm of a control lever 144, that rotates and through a stud 152 on its other end moves a transfer pawl 155 into operative position with respect to a ratchet wheel 159, fast with the totalizer wheel 83 of next higher order. Each transfer pawl is guided by a cam slot 154 embracing one of the control studs 152, and is actuated, after the disengagement of the totalizer from the actuator, by a bell crank 158 connected through a linkage to a pair of cams 161, 162 on the main shaft. As the transfer pawl advances, it is cammed upwardly by the engagement of its lower edge with a rod 133, until it contacts with the upper edge of a guide slot 173. This movement serves to prevent overthrow and to reset the latching bell crank 137. Minimum-movement devices. During each operation of the machine, a bail 232, Figs. 3, 10, and 13, suspended on arms 104 from rod 103, is rocked by cam slots 273 in the hooked members 179, 180 of the key coupler. Pivoted to and rocking with the bail are a series of pairs of companion links 233, 234, each pair being connected by a stud 235 that passes through cam slots 237 in a control sector 238, cam slot 236 in differential sector 49 and heart-shaped opening 229 in a setting rack 239. In an adding operation, the control sector rocks idly and the setting rack is positioned in register with the differential sector to set the printing and indicating mechanisms. Printing totals.-Depression and release of the total-taking key 39, Fig. 8, serves to rotate the totalizer wheels in reverse direction to zero, and sets the differential members to represent the amount accumulated in the totalizer. At the beginning of a total-taking operation, the zero stop pawls 61, Fig. 13, are disabled by a yoke 222 directly operated by the total key and engaging projections 225 on the pawls. The differential driving elements 70, Fig. 8, are rocked to mesh the racks 73 with the pinions 78 of the actuators 79 by rotation of the cams 76 through toothed sector 219 actuated by cam slot 215 in the total key. The totalizer is moved into engagement with the actuators. And arresting levers 243, Fig. 10, are rocked counterclockwise to engage the noses 262 of detents 253 over shoulders 263 on the control sectors 238 which are thereby locked. Further depression of the total key rocks the bail 232 and companion links 233, 234. The stud 235 of each pair of links follows the cam slot 237 in the locked control sector 238 thereby driving the differential sector 49, which, through rack 73 and actuator 79, returns the totalizer wheels to zero. At zero position, the engagement of the transfer tooth 130, Fig. 10, with a tail 264 of the detent 253 causes a toothed lever 255 to rotate and lock the actuator 79 and removes the nose 262 from the path of the shoulder 263 to free the control sector 238. During the remainder of the depression of the key, the stud 235 follows the cam slot 236 in the differential sector 49 to position the setting rack 239 for the printing and indicating mechanisms. The control sector 238 is rotated to press its cam surface 276 into engagement with the nose 262 of the detent 253 while the lower part of the cam slot 215 in the total key causes a sufficient rotation of the toothed sector 219 to return the arresting lever to its normal position. Finally the totalizer is moved out of engagement with the actuators.