Patent GB-732760-A (GB)
Abstract: 732,760. Calculating-apparatus; transfer mechanism. NATIONAL CASH REGISTER CO. Oct. 9, 1953 [Dec. 1, 1952], No. 27849/53. Class 106 (1). A calculating machine comprises two totalizers, corresponding totalizer-selecting keys which also function as machine-release keys, and a control key which when operated disables the totalizer selecting mechanisms so that both totalizers are engaged with the differential actuators, irrespective of which of the two totalizer-selecting keys is depressed. The invention is applied to a full-keyboard motordriven machine having an amount keyboard, and differential, printing and driving mechanisms as described in Specification 693,659. The present machine has a visible totalizer A and a concealed totalizer B, rockable about shafts 300, 324, Fig. 5, to engage actuating racks 312, 338 respectively. Each totalizer is similar to that described in this prior Specification and has similar transfer and fugitive-one mechanism. Differential mechanism. Stop-bars 74, Fig. 5, are pivoted to levers 76 carrying actuating racks 312, 338 and are controlled by a bail 80. A cam-controlled aligning bail 124 engages racks 123 on the lever 76 after their differential movement. Pawls 145 engage racks 144 on the stop-bars 74 during their outward stroke to prevent rebound, and are disengaged during the return stroke. Printing mechanism. A type-bar 88, Fig. 5, is coupled to each lever 76. When the bars are differentially positioned, interponents 96 carried by a bail 97 rock to effective positions. The bail 97 is then rocked and the interponents trip latches 95a to release hammers 95 which strike the selected type 93. A bail 121 engages teeth 120 on the type-bars prior to the disengagement of the totalizer in total-taking operations. Keyboard. Control keys: The amount keyboard has a key-release bail 187, Figs. 2 and 3, operative near the end of each operation and. held in operative position throughout the second cycle of total operations. This bail is also rocked by depression of a correction key 32, Fig. 18, such depression being prevented during machine operation. A key-locking slide 209 prevents depression of an amount key during machine operation and blocks the main operating mechanism if a key is partially depressed. In addition to the correction key 32, the present machine has " A " and " B " keys 26, 27, which select corresponding totalizers, Total and Subtotal keys 29, 29a, which normally select the A totalizer, and a Non-add key 31, all of which are starting keys. A crowding lock for these keys comprises sliding plates 909. A Subtract key 28 can be depressed with either the " A " or " B " key to which it is closely adjacent. However, after depression of an " A and B " key 24, the Subtract key 28 acts as a starting key to cause the set amount to be subtracted from both totalizers. Addition in both totalizers results from depression of the " A and B " key 24 and either the " A " or " B " key 26 .or 27. The A and B " key 24 is coupled to an " A or B " key 25 by a centrally-pivoted lever 260 and a detent arm 262 co-operates with a stud 258 in the stem of the key 24 so that always one or the other of these keys is in depressed positions. A " B* " key 30, enables totals 6r subtotals to be taken from the B totalizer by means of the keys 29, 29a. The keys 24, 25 and 30 are not starting keys. They are latched during each machine operation by a slide 229 coupled by a lever 232 to the key-locking slide 209, the slide 229 having lugs 257 which engage upper or lower notches 255, 256 in the key stems. When the " B* " key 30 is depressed, a sliding latch 242 engages a stud 246 in its stem and maintains,- the key in depressed position while the keylocking slide 209 is temporarily restored at the end of the first cycle. At the end of the second cycle, a stud 249 in the key-release bail 187 engages a pawl 250 on the latch to render it ineffective. The stud 249 also releases a slide 270, the end 271 of which, during a total operation of the A totalizer, blocks depression of the key 30. When an add operation is initiated, a pawl 435, Fig. 2a, carried by the initiating lever 425 engages in front of a projection 436 of a plate 437 to preventdepression of the Subtract key 28, Fig. 15, through an arm 401 connected to the plate 437. Depression of the " B* " key 30, Fig. 25, through a link 461, and arms 466, 473 fast on a shaft 467, and a lever 475, rocks an arm 478 into path of a leg 484 of the initiating arm 422, thereby blocking operation of the " A " and " B " keys. The arm 478, Fig. 26a, through a lever 489, also blocks depression of the Non-add, key 31. The latter is locked during operation by a lever rocked by the initiating lever 425. Mechanisms described below allow depression of one only of the " A " and " B " keys and look these keys and the " Total " and " Subtotal keys against depression during operation of the machine. Starting and driving mechanism. Extensions 419, 420, Fig. 18, of the " A " and " B " keys 26, 27 overlie a stud 421, Fig. 2, in an arm 422 pivoted with the machine-release lever 68 on a stud 69. The stud 421 engages a lever 425 pivoted on the lever 68 and coupled thereto by a spring 430. Depression of either key 26 or 27 consequently rocks the release lever 68 which, in known manner, closes the motor circuit and engages a one-revolution clutch to oscillate a mainshaft 65 and a secondary drive shaft 130. Depression of the Subtract key is normally ineffective to initiate an operation but when the " A and B " key is depressed, a link 645 is moved forwardly, as described below, to rock a lever 431 pivoted on the arm 422 clockwise into the path of a stud 410 in a plate 403, Fig. 15, so that when this plate is rocked by depression of the Subtract key 28, an operation is initiated. A lever 596a, Fig. 26a, rocked by the Non-add key 31, is fast with a latch 1620 coupled to a latch 1621, Fig. 4. The latches co-operate with a foot 628 of a lever 1622 which is consequently released on depression of the key 31. An arm 1625 of the lever 1622 then depresses the lever 425 to initiate an operation. The lever 1622 is restored at the end of the operation by a cam. The initiating mechanism is controlled in total operations as described below. Addition and subtraction. The totalizerframes 304, 328, Fig. 19, are rocked by cams 346, 351 early in the cycle to disengage the totalizers and restored in the middle of the cycle to engage the totalizers. The cams are coupled by pawls 573, 585 to levers 572, 584 having studs 569, 583 normally engaged by pitmans 562, 580 both pivoted to a lever 552 rocked by toggle arms 547, 545. Normally main pinions 308, 331, Fig. 5, are aligned with the actuating racks 312, 338, but for subtraction, auxiliary pinions 314, 335 meshing with the main pinions are so aligned. The totalizers are shifted axially for this purpose by respective cams 360, 361, Fig. 3, actuated by links 364, 378, the inner ends of which are moved upwardly and rearwardly respectively by control links 367, 381 so as to position surfaces 369, 382 in the path of studs 372,371 in a plate 370 oscillated during each cycle. The links 364, 378 are thus moved inwardly from the position shown to set the totalizers for subtraction. They remain so set until the next add operation in which, with the control links 367, 381 returned to the position shown, the studs 371, 372 engage surfaces 368, 383 of the links 364, 378 and restore them outwardly. The control links 367, 381, Fig. 15, are coupled by a lever 392 fast with an arm 401 rocked by depression of the Subtract key 28 to move the links from the add position shown against the action of a spring 389. Depression of the Subtract key through the arm 401 rocks the plate 437, Fig. 2a, so that when the initiating lever 425 is depressed, an ear 448 thereof engages a shoulder 447 of a pawl 444 carried by the plate 437. This plate and consequently the subtraction control mechanism is thus latched until near the end of the operation when a stud 192 in a cam plate rocks a lever 450 so that a stud 452 therein disengages the pawl 444 from the ear 448. Transfer and fugitive-one mechanism. In totalizer A, for example, a lever 316, Fig. 5, is rocked at transfer and held by a latch so as to permit an additional step of movement of the actuating rack 312. The lever has offset portions for co-operation with offset add and subtract transfer teeth on the corresponding main totalizer pinion. A similar lever is actuated by the highest order pinion to enter the fugitive-one by permitting additional movement of the lowest order actuator. The latch 515, Fig. 15, of this lever co-operates with an E-shaped arm 531, controlled also by the cam 360 which determines the add or subtract position of the totalizer, to prevent the entry of a fugitive-one when the totalizer is overdrawn. Non-add. The totalizers are normally disengaged early in each cycle. The pawl 573, Figs. 19 and 26a, of totalizer A, is then raised, to prevent engagement of the totalizer by a stud 609 in a lever 610 drawn to the left by a link 604 actuated by a lever 596a. The totalizer is engaged at the end of the cycle by a cam 601 which engages a stud 611a in the cam 346. The pawl 585 of totalizer B is rocked by a stud 617 in a lever 619 engaged by a link 612 pivoted on a stud 595. The stud 595 also operates the lever 596a and is carried by a link 594 moved leftwards by depression of the Non-add key 31. Totalizer B is engaged at the end of the cycle by a lever 621 rocked by a stud 132 in the toggle arm 545. Totalizer selection in entry operations. When the " A or B " key is depressed, a parallelogram linkage is moved to rock a shaft 643, Fig. 20, to the position shown in which a lever 644, through a link 645, holds links 649, 878 beneath studs in the " B " key 27 and " A " key (not shown) respectively. If the " B " key is then depressed, the link 649, through levers 647, 654, rocks a plate 657.