Patent GB-191205651-A (GB)
Title: Improvements in and relating to Calculating Machines.
Filed: 1911-04-19
Granted: 1912-07-19
Abstract: 5651. Marks, E. C. R., [McCaskey Electric Calculator Co.]. April 19, 1911. Adding and subtracting apparatus with several totalizers.-Relates in general to the arrangements for controlling the class of operation to be performed in single-bank keyset motor-operated adding and subtracting machines, and more particularly to the provision of separate controlling keys for addition and subtraction, to the interlocking of the controlling-keys with one another and with the item keys, and to the various effects obtainable by the combination with the totalizer pinions of forked racks for engagement above or below on either stroke, means for rotating the totalizer to zero while engaged with the racks, together with a secondary totalizer which may be engaged with the primary totalizer at will and is also capable of being restored to zero. Denomination - selecting and differential - stop mechanisms suitable for use with the present machine are described in Specification 4376/12, and totalizer-mechanism in Specification 4680/12. The adding-bar or key 301, Fig. 4, is mounted on arms extending from a cross-shaft 304, which carries an arm 305 adapted to swing a rod 224 rearwards so as to set parts for the addition engagement. As the adding-bar goes down, its arm 302 strikes a pin 308 on a lever 309 and carries it down together with a link 310 which in turn depresses a detent 312. An overlapping connexion between this detent and a companion one results in the downward movement of both, and hence a spring-operated collar loose upon the cross-shaft 304 impels a bar 223 forwards to assist in completing the setting, for addition. The subtraction key 325 is mounted upon a lever 326 which is loosely pivoted upon the shaft 304 and its operation, through the agency of the lever 309 as before, results in a rearward movement of the bar 223, but leaves the bar 224 unaffected, whereby the parts become set for subtraction. The non-adding key 27, Fig. 29, is also loosely pivoted upon the shaft 304 and upon depression moves a rod 331 rearwards to operate the clutch mechanism between the motor and main-operating shafts, whereby the latter performs one revolution, and incidentally, by rotation of the shaft 17, the detent 312 is swung forwards; the companion detent, however, engages a lug 318<a>, Fig. 7, and is thereby held, together with the bar 223, so that the actuating-racks remain in neutral position. Keyboard interlocks. - The adding-bar, subtraction key, and non-adding key have lugs upon their levers which are forced in between rollers affording space for the depression of one key only, as described in Specification 4376/12. By means also of lugs such as 332, Fig. 7, upon the keys, and spring detents 334, any depressed key is locked down until released through the agency of the forward-moving detent 312. Totalizing - counters; printing totals and sub-totals; zeroizing-mechanism. - With regard to all other operations of the machine, such as indicating or printing totals and subtotals, whether on the primary or the secondary totalizer, and passing amounts to and fro between the totalizers, the nature of the operation is determined by means of an external hand-lever upon a stud 352, Fig. 22, which actuates the motor-clutch bar 223 through the link 358, and is compelled to perform a full stroke by means of a rack 367<a> and reversible pawl 368; it is locked in operated position by a tooth 381 taking over the end of a fixed plate 382, and the locking-action is terminated by means of a lug upon the main operating-shaft. In conjunction with the totalizer controlling- lever, there is a manual rotary setting-head 371 having five positions according to the operation required, by the setting of which a slide-bar 375 is correspondingly positioned longitudinally. For most of the operations thus determined, it is necessary to arrest the primary totalizer wheels in zero position, for which purpose a frame 391 is rocked downwards and inwards, carrying zeroizing-fingers 395 thereon into the path of the transfer pins 125; simultaneously, and also through the agency of a link 389, the locking-bails of the differential denominationselector are swung aside to allow the main slides of the machine to move forwards. In certain operations the actuating-racks remain engaged with the totalizer pinions during the return movement, for which purpose any setting of the selecting slide-bar 375 bringing a depression 412 beneath a pin 411 results in holding the engagement-determining lever 232 forward against its spring during the period of its normal return, until, near the end of the revolution of the main operating-shaft, the return of the link 380 trips the retaining-lever 401 and the engagement terminates. The five operations described are:-(1) Total; upper teeth in on forward, out on backward strokes, leaving totalizer at zero; (2) sub-total; upper teeth in on forward and backward strokes; (3) credits; as in sub - total; (4) registering total on secondary totalizer; upper teeth in on forward. out on backward strokes, secondary totalizer engaged; (5) grand total from secondary totalizer; lower teeth in on forward and out on backward strokes, secondary totalizer engaged. Error keys. -- Erasing is effected by a key adapted to force a rod 776 rearwards whereby a lug 779, Fig. 14, thereon is carried into the path of an erasing spider 780 upon the end of the stop cylinder; simultaneously the stopcylinder escapement is actuated and the consequent rotation of the stop-cylinder brings the arms of the spider against pins 64 upon the stop locking-bails 58, which are thereupon restored. In all the above operations, with the exception of ' credits,' resetting of the unlocking-bails is also necessary in order that the main-slides may move forward, and for this purpose somewhat similar connexions are provided, operated from the main shaft, the resetting-spider, however, receiving a positive movement with regard to a stationary stopcylinder. Multiplying and dividing by repetition.-The parts just described may be disabled by means of a repeat-key whereby no rotation of the resetting-spider takes place, and this key is automatically restored to normal position when the totalizer controlling-lever is actuated. Operating by motors.-A primary shaft 1141, Fig. 38, is driven directly by an electric motor (not shown) and carries a cup-wheel 1144 forming part of a clutch between it and a shaft 1155<a>, Fig. 33, driving the main operating- shaft 1171; it also drives, through a chain 1146, a shaft 1148 having a similar cup-wheel 1149 and clutch for driving the differential denomination-selecting stop-cylinder. The clutch for the main operating-shaft comprises three radial dogs 1150, Fig. 33, notched on their under edges to take the rim of the cup-wheel and also notched to take over a plate 1152 fixed to a spider on the follower shaft 1155<a>. Springs 1156 tend to cause the dogs to engage and grip the rim of the driving-cup, but by arresting rotation of a wheel 1157<a>, Fig. 44, upon the follower certain notches thereupon engage lugs 1159 upon the dogs, Fig. 39, and swing them against their springs into a disengaged position. As shown in Fig. 44, a pivoted grip-dog 1172, Fig. 47, is arranged with its notch 1172<a> taking over the rim of a cup-wheel 1157<a> upon the follower shaft, with which the spider is arranged to move. Upon operation of the adding-bar, subtraction-key, or totalizer controlling-lever, a lever 227 is rocked to operate link-work whereby a spring detent 1176,normally engaging a notch 1175 in the grip-dog, is disposed and allows a spring-constrained movement of the dog to free the cup-wheel 1157<a>, whereupon the three dogs 1150 of the clutch proper effect engagement. As the shaft 1171 completes its revolution a pin 1184 thereon resets the parts so that the clutch is opened. Suitable connexions are made whereby the non-adding key also operates the main-shaft clutch. Similar arrangements are provided for the stop-cylinder clutch and its associated control mechanisms, and friction driving-connexions are provided for both drives, in order to prevent damage due to possihe jamming of parts of the machine. Various cams are provided upon the main operating-shaft 1171 for carrying out the movements of the machine in proper sequence. Interlocking.-As shown in Fig. 4, the gripdog 1172 of the main-shaft clutch mechanism, and the grip - dog 1160 of the stop - cylinder clutch, have interposed a lever 1251<a> with at one end a lug 1279 for co-operation with the dog 172 and at the other a pivoting-connexion with the stop-cylinder dog 1160, the parts being such that the dogs cannot be operated simultaneously.