Patent GB-532666-A (GB)
Abstract: 532,666. Calculating-apparatus. NATIONAL CASH REGISTER CO., Ltd. (National Cash Register Co.). June 23, 1939, No. 18340. [Class 106 (i)] A multiplying machine or attachment for use in connection with an accounting machine is provided with mechanism, wherein there are provided means representing values on certain linear co-ordinates of a multiplification table, means for selecting values in accordance with the multiplicand entered, means controlled in accordance with the multiplier entered to combine the selected values algebraically to form partial products, and an accumulator to sum the partial products. Assuming the multiplier has six digits a series of nine operations is required to perform the multiplication process ; the first operation introduces the multiplicand set up on the keyboard; the second operation similarly introduces the multiplier, after which the machine functions automatically through six multiplying cycles and finally an automatic operation takes place in which the product obtained is printed. Partial product computing devices.-The units and tens values of the partial products are shown in Figs. 2 and 3, for the units only those values in rows 1 and 4 are utilized. For each denomination two units devices and one tens device are employed and each is composed of a set of wheels with a varied number of teeth. The units devices 271, 272 have teeth in accordance with the shaded portions of Figs. 4 and 5, while the tens devices 273 have teeth arranged as shown by the shaded portions in Fig. 8. The units devices are adapted to be driven in either a positive or negative sense either singly or together. Multiplication process.-The system of multiplication for single digits is shown diagrammatically in Fig. 9. In the first place a shaft 239 is displaced to engage a bevel pinion 238 thereon with a companion pinion 237. The multiplicand is then set up on the keyboard and the differtial actuating mechanism through a system of ring gears 222, 234 with internal and external teeth, similar to that described in Specification 280,828, [Class 100 (iv)], transmits the setting through gears 235, 237, 238 and a long pinion 260 to racks 261, 265. By this means the racks, which are attached to arms 262, 266, displace pinions 264, 268 thereon so as to set them opposite the appropriate partial product toothed wheels 273 and 271, 272 that are secured to shafts 350, 355 and 415 respectively. The shaft 239 is then returned to disengage the bevel pinions 237, 238. After the machine comes to rest the multiplier is then set up and a multiplier storage pinion 301 is engaged with the gear 222 to receive the setting. The set pinion is then rocked into engagement with a pinion 316 operatively connected to a control cylinder 330 slidably and rotatably mounted on a shaft 320. The storage pinion is thereupon re-set to zero and differentially sets the cylinder 330. The cylinder has three sets of projections 411a, 411b, 351a, 351b and 394 shown developed in Fig. 31 ; one or more of these sets are brought into operative alignment with studs on arms 413, 353, and 392 which control the drive and direction of movement of the shafts 355, 415 when the cylinder is displaced, first to the right then to the left and back to normal during the operation. The arm 413 when shifted engages one or other bevel gear 421, 422 with the driving gear 423. The arm 353 similarly controls the engagement of one or other bevel gears 385, 386 with the driving gear 387. The arm 392 controls a sleeve 391 so as to connect the pinion 401 driving the gear 387 with one or other of two pinions 402, 403. One revolution of the pinion 403 imparts a clockwise or counterclockwise revolution to the shaft 355 while the pinion 402 has twice the number of teeth to transmit a second rotation in accordance with the table shown in Fig. 7. The rotation imparted to the shafts 355, 415 is transmitted through the selected partial products devices 271, 272 for the units to the pinion 268. The resulting units movement is thus transmitted by a long pinion 471 and gear 472 to a product accumulator. The differential rotation of the cylinder 330 is communicated through gearing 345 ... 348 and the shaft 350 to the tens partial product gears 273 and pinion 264. The tens value is then transmitted through a long pinion 481 and gear 1481 to the appropriate denomination of the accumulator. Machine, construction and operation.-The multiplying mechanism is shown in Figs. 10A and 10B, as an attachment to an accounting machine of the Ellis type as described in Specifications 28253/08, [Class 106], 427,722 and 461,347. The machine has banks of keys 201, a multiplication key 202 and a motor starting bar 203. The three-armed levers 206 associated with the differential racks 204 are connected by links 207 to segments 208 that co-operate with the ring gears 222. The machine is operated by an electric motor on depression of the bar 203 ; the motor drives a shaft 650 provided with teeth engaging a gear 652, Fig. 14, loose on the main operating shaft 210. The gear 652 carries a coupling pawl 654 normally engaging a notch in a disk 655, Figs. 13 and 14, rigidly connected to a gear 656 by a hub loose on the main shaft and operative to drive the accounting machine in any suitable manner. A roller 659 on the pawl engages a cam groove 660a in the face of a gear 660 normally connected to the gear 652 by a double coupling pinion 661 mounted on a two-armed lever 662. The lever also carries a second pair of coupling pinions 664 which when the lever is rocked connect the gear 652 to a gear 665 secured to the main shaft 210. The rocking of the lever is effected on depression of the multiplication key 202 by the action of a slide 670 and linkage 667, 666. At the same time an associated linkage 682 ... 684, Figs. 13 and 16, is operated to place a roller 685 into contact with a cam 686 secured to the main shaft 210 and a projection 690 on the lever 662 locks the gear 660. During the first one-sixth rotation of the main shaft, to enter the multiplicand set up, the roller 659 moves in a concentric part of the cam groove 660a and one of the nodes on the cam 686 is effective to raise to link 683 and disengage the lever 682 from the slide 670 whereupon the key 202 and bar 203 are released to stop the machine. To enter the multiplier set up the key 202 and bar 203 are again depressed ; the main shaft then executes another one-sixth of a rotation. The drive of the accounting machine during these partial rotations effects the printing of the factors by the type sectors 1211. After the second partial rotation the roller 659 engages a rising part of the cam groove and disengages the pawl from the notched disc 655 so as to stop further drive to the accounting machine. As the cam disc 686 has no node at this position the key 202 and bar 203 are not released so that the main shaft 210 continues to rotate. During three further partial rotations the six multiplying cycles take place and then a final partial rotation is effected. During this last one-sixth rotation the pawl 654 is moved by the cam groove into engagement with the notched disc 655 so that the accounting machine drive is effective to record the product. Thereafter the second node of the cam disc 686 effects release of the key 202 and bar 203 to stop the machine. Multiplicand entering mechanism.-The selection of the partial product devices 271, 272 and 273 in accordance with the multiplicand is effected by engaging the segments 208 with the ring gears 222, 234, Fig. 11A, B, Fig. 17A, B, and Fig. 18 in timed relation with the actuators 204 which receive a differential movement depending on the keys depressed by rocking the arms 211 which are operatively connected by cams mounted on the shaft 214 and a driving gear on the main shaft 210. The segments are operated by a rod 228 on a lever 229 through the action of a cam 227 driven by a driving wheel on the main shaft. Before the setting movement is effected, the bevel gears 238 on shafts 239, Fig. 18 and 19, are moved into engagement with the bevel gears 237 by a beam 245 attached to the arms 246 of a yoke 247 that is rocked by cams on the shaft 214, Fig. 17B, and a driving gear on the main shaft. The shafts 239 carry long pinions 260 that cooperate with racks 261, 265 to set the pinions 264, 268 in alignment with the partial product devices 273, 271 and 272. The shafts 239 are then returned to disengage the bevel gears. Multiplier entering mechanism. During the second operation, after the multiplier has been entered on the keyboard, the storage pinions 301 1  ... 301 6 , Figs. 12B, 17A are first moved into engagement 'simultaneously with the ring gears 222 and after receiving the setting are disengaged. The engaging and disengaging movement is effected by a pair of complementary cams acting on the arms 306 and operatively connected to driving gears 314 1 - 6  on the main shaft. Multiplying mechanism.-After the multiplier storage wheels 301 1 , &c., have been set other toothed portions of the driving gears 314 1 , &c. in staggered arrangement are effective to rock the storage wheels, commencing with the units denomination, into engagement with corresponding pinions 316 1 -316 6  loose on a resetting shaft 320, Fig. 17A, and meshing with pinions 317 secured to a shaft 325. The shaft 320 is driven through six revolutions, one for each multiplier digit, during the three partial multiplying cycles of the main shaft by means of a driving gear and mechanism operatively connecting the shafts. During the first rotation, when the units storage wheel 301, is reset, the pinion 316 1  drives the shaft 325 which transmits the setting to the control cylinder 330, Fig. 12B. The rotary movement of the cylinder is transmitted by a gear 345 thereon to the shaft 350 to actuate the tens partial product devices 273. The control cylinder is then released for axial to and fro movement by first rotating a shaf