608,989. Calculating-apparatus. ALLEN-WALES ADDING MACHINE CORPORATION. March 4, 1946, No. 6642. Convention date, April 3, 1945. [Class 106 (i)] A calculating machine comprises a totalizer, means for entering items therein and a manually operable member adapted to cause either an itementering operation or an itementering operation followed by a sub - total - taking operation according to the length of time during which it is maintained in the operated position. The invention is applied to a machine for performing addition and subtraction of the Allen-Wales type; the differential, transfer and driving mechanisms being substantially the same as those described in Specification 598,524. Keyboard. Control keys. The amount keyboard is removably mounted on trunnions 128, Fig. 8, and on a rod 129 and is secured by latches 130. Each bank of keys is provided with a bar 136, Fig. 13, to retain any key in its depressed or undepressed position, a bar 134 to actuate a zero stop 133, Fig. 3, of the differential mechanism and a locking bar 138 which locks the keys against movement during a machine cycle. For this purpose, the rocking of a driving disc 103, Fig. 8, allows a lever 141 to rock so as to permit a bar 140, to which the bars 138 are secured, to move laterally of the machine. The return movement of the lever 141 at the end of the cycle rocks a key-release bail 148 to restore the zero stops and to release the keys. If the bar 140 does not complete its movement due to the incomplete depression of a key, a lug 95 on the bar 140 prevents rotation of a lever 90 and a shoulder 96 thereon engages a block 97 on the drive plate 103 to prevent full movement of the latter. Actuation of a repeat lever 149 rocks a plate 151 so as to prevent the lever 141 from moving sufficiently to rock the key-release bail 148. Depression of a correction key 160, Fig. 6, rocks a bell-crank 175 which in turn rocks the key-release bail 148. The control keys 160-164 are mounted on stems which each carry a stud 180 for direct or indirect co-operation with slidable plates 179, 181, 182, 183 to form a crowding lock. Moreover, the studs 180 on the stems of the control keys 160-163 prevent movement of the keys during a machine cycle by their co-operation with a locking slide 250 having bayonet slots 254 to engage the stud 180 of the depressed key. The total-taking key 164 may be held depressed by the engagement of a stud 186 on a lever 185, rockable by depression of the key 164, in a slot 255 in the locking slide 250. Depression of any control key 161-164 acts by contact, directly or through intermediate levers, with a stud 211 to rock an arm 199 so as to remove a lug 198 to allow a lever 197 to rock. Such movement of the lever 197 switches on the driving mechanism for a one-cycle operation and also moves the locking slide 250 through a lever 252. To prevent actuation of the total-taking key 164 when any amount key is depressed and vice versa, the rocking of any zero stop-bar 134, Fig. 13, moves a bar 237 laterally of the machine, thus rocking an arm 232, Fig. 17, so as to position a flange 239 in the path of the lever 185 actuated by the totaltaking key 164. Total-taking. In order to take a total, the totalizer wheels are maintained in engagement - with their associated rack levers during the forward movement of the latter and so are driven in the reverse direction until the transfer cams abut projections on the corresponding transfer levers. The totalizer wheels are then disengaged during the return part of the cycle. A blank cycle is first performed to restore any tripped transfer levers. Depression of the total-taking key 164 rocks a lever 495, Fig. 8, which acts through intermediate levers to rock an arm 478 so that, when an arm 480, to which the arm 478 is pivoted, rocks to and fro during the first cycle by means of its contact with a stud on a link 102 which drives the disc 103, a shoulder 477 on the arm 478 engages a stud 476 on a lever 473 and rocks the latter and a plate 471, Fig. 15, to which it is connected, so as to rock a bell-crank 404 through a link 475. Movement of a link 443 by the bell-crank 404 then rocks an arm 449 which is latched by an arm 453 and since the arm 453 engages a lug 203 on the arm 199, the latter is depressed so that the driving mechanism is switched on for a further one-cycle operation. During this first cycle, a toggle mechanism 411, 413, operated by a rear driving shaft 76, rocks a bell-crank 400 counter-clockwise and then restores it. A pitman 399 is held in a lower position during this movement by the engagement of the bell-crank 404 over a stud 407 on the pitman 399 so that it engages a stud 398, Fig. 18, on a lever 390 which is coupled to an arm 388 and rocks the latter, thereby controlling, through a cam slot 387 in the arm 388, a lever 304 on which the totalizer is mounted. In this way the totalizer wheels are disengaged from their associated racks during the first part of the cycle and re-engaged during the second part as for addition or subtraction operations. During the second cycle, since the bell-crank 404 is latched in its counterclockwise position, the pitman 399 is allowed to disengage under spring action from the stud 398 on the lever 390 and to move forwardly, with its surface 511 in contact with a stud 512 on an arm 284 carrying the restoring bail 281 for the rack levers, so that the lever 390 is not rocked and the totalizer wheels remain in engagement with the rack levers. As the arm 284 completes its counter-clockwise rotation, the pitman 399 is allowed to move further under spring action so as to engage a stud 514 on the lever 390 and, during the return movement of 'the pitman 399, the lever 390, and so the arm 388, will be rocked clockwise in order to disengage the totalizer wheels from their rack levers. At the end of the cycle, a cam 420 on a main driving shaft 100 restores the arm 388 and the totalizer and a stud 144 ori the driving disc 103 rocks the latch arm 453 so as to allow the arm 449, link 443 and bell-crank 404 to be restored to their initial positions. A link 535 secured to the bell-crank 404 acts through a lever 533 to maintain the key-release bail 148 in its rocked position during the first part of the second cycle so as to remove the zero stops from the paths of the stop-bars. In the middle of the second cycle, the stud 144 on the driving disc 103 rocks a lever 539 to disengage the link 535 from the lever 533 so that the zero stops are released to engage ratchet teeth 544, Fig. 2, on the stop-bars and so to prevent the stopbars from moving forwardly unnecessarily. The subtraction latch 351, Fig. 8, which may rotate a shaft 270 to condition the machine for subtraction, is held inoperative during the second total-taking cycle by a flange on a plate 543 carried by the lever 443. Sub-total-taking. In order to take a subtotal, the addition key 161, Fig. 6, is held depressed after an item-entering operation, whereupon the arm 199 is maintained in its downward position to initiate a first sub-totaltaking cycle of operation, during which the arm 478 is held downwardly through a lever 551, link 553, lever 554 and link 557 so that when it is moved by the arm 480, Fig. 8, as in total-taking, a shoulder 561 engages a stud 560 and rocks the lever 473 and plate 471 counterclockwise in order to rock the bell-crank 404 to initiate the second cycle as in total-taking. The arm 478 is prevented from engaging the stud 560 during the item-entering operation since the arm 480 is blocked against movement by a projection 516, Fig. 17, on the arm 232 which is moved as described by the depression of any amount key. During the second subtotal-taking cycle, the pitman 399, Fig. 15, moves as in total-taking, but is prevented from engaging the stud 514 on the lever 390 by means of a stud 562 on the link 475 which is lifted and moved forwardly by the plate 471. The totalizer wheels therefore remain in engagement with their racks so that the amount standing on the totalizer prior to the sub-totaltaking operation is added back into the totalizer. If the control key 161 is depressed when no amount keys are depressed, movement of the arm 480 is not prevented by the arm 232 during the first cycle of operation and if the arm 478 is held down long enough to engage the stud 560 by continued depression of the key 161, sub-total-taking occurs immediately. Printing mechanism. Non-add and non- print mechanism. Amount type bars 663, Fig. 2, are adjusted vertically by rear extensions 272 of the diverging levers of the differential mechanism. If a type bar is raised during any cycle of operation, a stud 747 carried thereby allows an arm 748, mounted on an arm 750, to rock counter-clockwise so that, when the arms 750 are rocked by studs 761 carried by arms 760 mounted on the rear driving shaft 76, the arm 748 trips a latch 744 and so releases the associated hammer 740 which strikes the type member in the printing position. In order to print zeros after a significant figure, each latch 744 carries a finger 765 by means of which it may be tripped by the operation of the latch of the next higher order. The hammers are restored by a bail 764 carried by arms which are rocked by a linkage to the rear shaft 76. Rocking of the rear shaft 76, Fig. 18, acts through a cam to lower a pitman 634 and so lowers an arm carrying a pawl 621, normally held against a fixed stop 626, in order to engage the pawl with ratchet teeth 620 secured to the platen 600 which is resiliently held against rotation by a sprung lever 629. On return of the pitman 634, the pawl 621 rotates the platen 600 by one or two steps according to the setting of a lever 645 which controls the positioning of stops beneath the arm carrying the pawl 621. Extreme movement of the lever 645 prevents any movement of the platen 600 and also acts through an arm 646, Fig. 2, to rock a bail 647 carrying a latch 774 so that the movement