Patent GB-221134-A (GB)
Abstract: 221,134. Haddan, A. J. H., (National Cash Register Co.). May 30, 1923. Adding-machines; statistical machines; cash registers; with operating- means and with several totalizers.- In machines having sets of totalizers arranged in denominational groups on two series of shafts and actuated by racks arranged between them as described in Specification 184,824 the actuating racks common to the denominational groups carry auxiliary racks which are adapted to be moved into and out of engagement with the totalizers. Means are also provided for aligning the pinions of the totalizers. The invention is shown applied to a record-controlled machine for compiling statistics as described in Specification 221,255. Differential mechanism.-Aligning and locking mechanism. The lateral movement of each totalizer shaft 176 from the neutral position is effected by a rack 181, Fig. 8, carrying a lever 179 having a forked end engaging a pin 177 on the end of the shaft and controlled by a differential mechanism comprising a constant-excursion member 213, Figs. 1 and 16, secured to an oscillatory shaft 190 and a differential member 214 loose on the shaft and connected bv a latch member 219, 220, to the member 213. The latch member is pivoted at 218 to the differential member and is under the control of a spring 222. During the initial counterclockwise movement of the shaft 190 the latch is rocked so that a projection 223 thereon enters a notch 231 of the member 213 and a projection 224 is freed from a tooth of a fixed rack 225 whereupon, on the further movement of said member a notch 229 thereof engages a pin 230 on the differential member and causes it to move therewith. During the clockwise movement of the shaft 190 the differential member is carried with the member 213 until an electromagnet 238 is energized, the armature of which rocks a bar 235 to engage a tooth of a rack 215 pivoted at one end to the latch plate 219 and supported at its other end by means of a pin-andslot connection by the differential member. The magnet is energized as described in the abovementioned Specifications but may be controlled by other means such as keys. The pin-and-slot connection permits the latch members to rock to disengage the projection 223 from the member 213 and causes the projection to engage the rack 225 to lock the differential member. If no magnet is energized the movement of the differential member is arrested by a pin on the rack 225 engaging the end 227 of the rack 215. The usual " minimum movement " device is provided to position each of the racks 181 and comprises a link 248, Fig. 1, attached to the differential member, and a beam 247 pivoted to a plate 245 on a hub 243 loose on the shaft 198 which hub carries a segment engaging the rack 181. The beam 247 co-operates with an actuator 250 fixed on a shaft 188. The plate 245 has a toothed sector 252 with which co-operates an aligning pawl 253 secured to a shaft 189. The shafts 188. 190 are rocked by means of pairs of cams actuated by gearing from a drive shaft 154. Each differential-selecting mechanism is associated with two banks of contacts similar to those described in Specification 185,075, excepting that a short contact 274 is provided and positioned beyond the " L9," " R9 " contacts. The differential mechanism for the actuating racks 277, Figs. 2 and 11, of the totalizers is substantially identical to that described above for totalizer-selecting but in this instance the short contacts 274 are located between the " L0," " L1 " and the "R0," " R1 " contacts. Each of the latter differential members 214 has integral therewith a segment 299 which engages a corresponding rack 285 guided on rollers and having slots 284 with which engage flattened pins on an upper and lower totalizeractuating rack 277. Each rack 285 has integral therewith a toothed member 301 which cooperates with a large tooth 300 on the segment 299 and is so arranged that when the teeth of the segment are disengaged from those of the rack 285 the outer edge of the tooth 300 bears against the cut-away portion 302 of the member 301. The contact 274 is placed between the " O " and " I " contacts to increase the travel of segment 299 to ensure full engagement of the teeth with the rack teeth to limit the play of the rack. The shaft 294 to which the member 213 is secured is adapted to be rocked by double cams actuated by rotation of a shaft 151. The actuating racks 277 are moved into and out of engagement with the totalizers by means of levers 280 provided with pins engaging slots 278 in the levers and mounted on shafts 281, 282 connected by levers 317 and links 318. The shaft 281 is rocked by segments 319, 320, Fig. 11, actuated by double cams so arranged that one cam effects the engagement of the racks with the totalizers and the other the disengagement thereof. The timing is such that the racks are in engagement during the movement of the racks to the right, Fig. 2. Two aligning devices are provided, one for holding the totalizer pinions except those in the plane of movement of the actuating racks, and the other for holding all the totalizer pinions when the racks are in their disengaged position. The first mentioned device comprises plates 338 mounted on arms 337 fixed to shaft 339. Fig. 4, which are rocked, to disengage the plates during the differential setting of the shafts 176, by means of arms 341 on the ends thereof which arms engage notches in a member 343 reciprocated by means of a bell-crank lever 345 and a cam-race 348 in a disc on the drive shaft 150. The second aligning device comprises bars 355, Fig. 26, each with an aligning slot 356 and mounted on pins 352 projecting from the totalizer shafts 176. The bars are withdrawn from the locking position during the actuation of the totalizers by means of U-shaped bars 358, Fig. 6, having projections engaging slots in the bars 355 and reciprocated by means of a bell-crank lever 361 operatively counected to the shaft 150.