Patent GB-606627-A (GB)
Abstract: 606,627. Calculating-apparatus; transfer-mechanism; zeroizing-mechanism. ALLENWALES ADDING MACHINE CORPORATION. March 4, 1946, No. 6643. Convention date, April 3, 1945. [Class 106 (i)] A calculating-machine adapted to receive additive and, by complementary addition, subtractive, entries and having a totalizer settable to represent the true value of a positive total and the nines complement of a negative total comprises means operative on taking a total to cause the differential mechanism to be displaced under the control of the totalizer to clear the totalizer, printing mechanism selectively operable to print either the amount represented by the displacement of the differential mechanism or the nines complement of that amount, and means controlled by the totalizer, according to the algebraic sign of the total; and operable in a total-taking operation to control the operation of the printing mechanism so that it will print the amount corresponding to the displacement of the differential mechanism if the total is positive and the nines complement of said amount if the total is negative. Keyboard. Each column of amount keys and the column of control keys is associated with a latching plate 78, Fig. 9, a zero stop 83 operated by a bail 82 and a locking strip 127 which is rocked during each cycle of operation by a lateral movement of a bar 129, Figs. 4 and 11, permitted by the rocking of a key-release lever 99. In order to release a depressed control key at the end of a cycle, the latching plate 78 associated with the control keys is rocked to an inoperative position by a lever 141 when the corresponding locking strip 127 is moved into locking position. The return movement of the key-release lever 99, caused by a stud on a drive plate 105, rocks a key-release bail 87. Depression of a correction key 116 rocks a lever 118 which cams the key-release bail laterally in order to rock the latching plates 78. The keyboard is mounted for lateral movement on trunnions 143, Fig. 2, and studs 149 and can be removed by loosening a retaining member 151. Depression of a subtraction key 62, Fig. 4, acts through a cam surface on the key stem and a stud 342 carried by the keyboard to move the latter to the right against the action of springs and a latch, which is released by the key-release mechanism, retains the keyboard in its moved position throughout the first part of the cycle. The latch is also released by the lever 118 on depression of the correction key. Drive and repeat mechanism. Depression of an add bar 317, Fig. 11, rocks a latch 310 to release a lever 304 which acts through a link 307, Fig. 13, to rock a lever 290 which closes a motor switch 283 and frees a dog 287 of a onerevolution clutch. The main shaft 106 is driven through a pair of plates 293 connected by balls under pressure of a spring 294 and at the end of a cycle a cam 315 restores the lever 290 and the associated parts. The plates 293 may be disconnected and a handle may be secured to the main shaft for manual operation. If the add bar is maintained in the depressed position, a stud 327 on its stem prevents movement of the key-release lever 99 so that any depressed keys will remain depressed and the drive will be initiated for a further cycle. When the keyboard is moved laterally by depression of the subtraction key, a cam plate 355 secured to the keyboard rocks a lever 358 which releases the latch 310 to initiate the drive. The latch 310 is also released, by means of levers and links, by depression of the total, sub-total or non-add key. Differential mechanism. Stop-bars 165, Fig. 2, are pivoted to rack levers 166 and are released for forward movement, limited by the depressed key stem or zero stop, by a cross-bar 185 carried by levers 186 which are rocked under the control of a cam slot in a plate on the main shaft 106. An auxiliary stop-bar 335 is pivoted to each stop-bar 165 and is rocked, during forward movement of the stop-bar, by a cam surface 337 so that its abutments properly co-operate with a depressed key stem,. when the keyboard has been moved laterally in a subtraction operation, in order to move the corresponding rack lever by an amount representing the nines complement of the amount represented by the depressed key. When the keyboard is in the subtraction position, the stop-bars are not engaged by any depending zero stops, but are allowed to complete a full movement if no keys are depressed in the associated denomination. The totalizer wheels are carried on a shaft supported by arms 196, Fig. 19, which may be rocked by the engagement of a stud in a cam slot of a plate 213 connected by a link to a lever 220 which is operated by a toggle linkage 221, 222 driven by a rear shaft 223. In addition and subtraction, the totalizer, which normally rests in engagement with the racks on the rack levers, is disengaged during the forward movement of the stop-bars and re-engaged during the return movement in order to add into the totalizer the amount set up on the keyboard or its complement respectively. Transfer mechanism. When a totalizer wheel passes from the " 9 " to the " 0 " position, a cam 201, Fig. 3, rocks a lever 240 which is then held by a latch 260, the movement of which allows the rack 170 of the next higher denomination to move one step relatively to its rack lever. At the beginning of a cycle, when the totalizer has been disengaged, but before the stop-bars are released for movement, a stud 274, Fig. 11, on the driving link 224 to the main shaft 106 engages a link 268 in order to rock a shaft 266 on which is mounted a bail 265, Fig. 2, which releases the transfer latches 260 and so restores the transfer mechanism. " Fugitive one arrangements. An overflow totalizer wheel is provided with a transfer mechanism, the lever of which is secured by a bail to the transfer lever of the units wheel. Item printing. The printing mechanism is mounted on a pair of plates 365, Fig. 2, which are detachably supported on shafts 223, 372 and to which are pivoted a pair of arms 377, Fig. 16, carrying a shaft on which type wheels 180 are supported. The latter are moved against an inked ribbon and platen 380 during each cycle by a toggle linkage 390, 393, operated by an arm 369 on the rear shaft 223. The type wheels are rotated in one direction or the other by double-rack bars 182 which are set by the rack levers 166 and guided for vertical movement in a basket 406 which is pivoted, independently of the arms 377, on the supporting plates 365. A stud 414 on each supporting plate normally holds the basket so that the front racks 401 are engaged with gear-wheels 400 on the type wheels but, in adding operations, as the arms 377 move rearwardly, the gearwheels 400 are moved into engagement with the rear racks 402 and are locked in this position by a lever 426, pivoted on each arm 377, which moves over a stud 418 carried by the basket. In a subtraction operation, a lever 453, Fig. 13, is rotated by the lateral movement of the keyboard and moves a link 451 rearwardly to rock bail 448 which allows a pair of levers 445 to rock and to release a lever 427, Fig. 16, on each arm 377 against the stud 418 to prevent relative movement between the arms 377 and the basket 406. The gearwheels 400 thus remain in engagement with the front racks 401 and are rotated in the opposite direction to that in which they are rotated for addition so that the complement of the amount represented by the differential movement is printed. An aligning bar 465 is maintained in contact with the type wheels to prevent their rotation except during the vertical setting and return of the double-rack bars. The ribbon is fed by sliding bars 530 operated by a link 533 connected to the link 393 and the platen is rotated at the end of each cycle by a pawl 570, Fig. 13, operated by a link 576 controlled by an arm 587 on the rear shaft 223. Pressure rollers 559, 560 may be released by rocking a knurled wheel 565. Printing of zeros. In an addition operation, a zero movement of a stop-bar normally positions the type wheel to print zero. However, in denominations above that of the highest significant figure, a re-adjusting lever 493, which is pivoted on an arm 495 and moved, by a cam 370 on the rear shaft 223, downwardly and, by the engagement of a rear arm 500 with a stud 503, forwardly during each cycle, engages the uppermost of a series of studs 491 on the double-rack bar 182 and moves the latter downwardly in order to set the type wheel to a blank position. The lever 493 corresponding to a significant figure is prevented from moving forwardly by the engagement of its front face with the studs 491 and forward movement of the levers 493 of lower denominational orders is prevented by ears 507 so that re-adjustment does not occur in denominations below that of a significant figure. In a subtraction operation, the type wheels are set to the blank position when the differential mechanism makes a full movement and in each denomination above that of the highest significant figure the lever 493 passes over a stud 509 without operating it. When the type wheel is set to print a significant figure of one to eight, forward movement of the lever 493 is prevented by the studs 491 and the ears 507 prevent forward movement in lower denominations, so that if the type wheel in one such denomination is set to the blank position, the stud 509 will be engaged by the lower surface of the hooked end of its lever 493 and the type wheel will be re-adjusted to print a zero. When the significant figure is nine, forward movement of the lever 493 is initially prevented by its ear 507, since the levers of higher orders are initially prevented from moving forwardly by the engagement of the front surfaces of the levers with the lowest studs 491, with the result that the lever moves behind the upper stud 491 and so controls levers of lower orders as when the significant figure in one to eight. Sub-