Patent GB-787507-A (GB)
Abstract: 787,507. Calculating-apparatus. VICTOR ADDING MACHINE CO. July 22, 1954 [Jan. 14, 1954], No. 21416/54. Class 106 (1). In a key-set and independently-operated calculating machine, a total-taking mechanism, which may be pre-set to perform total-taking or subtotal-taking, is automatically effective in machine cycles in which no amount is set. The machine described is capable of performing multiplication and division by repeating methods and the automatic total-taking mechanism is effective to print the remainder at the conclusion of a division operation and the product in multiplication. The machine, which is basically similar to that described in Specifications 666,276 and 731,620 has a ten-key setting mechanism including a transverselymovable pin-carriage 70, Fig. 4, which differentially arrests actuators 80 when these are released for rearward movement in a machine cycle powered by an electric motor. The actuators drive gear segments 100 with which may be engaged an add-subtract totalizer C comprising intermeshing pairs of pinions 108, 109, and also segments 88 bearing type 86 against which a roller platen 92 is moved to effect printing. Tens transfers are effected by permitting additional steps of movement to the segments 100. The present machine also has two storage registers A and B which are engageable with extensions 892 of the actuators 80. Although the actuators are returned forwardly of the true zero position, the extensions 892 which are pin-and-slot connected to them abut in their zero position against a rod 1238. These registers are used in multiplication and division, A as a counter and B to store a multiplicand or a divisor. An entry operation is initiated by depression of an add bar 50, Fig. 76, or a subtract bar 52, either of which depresses a release link 512 to close a motor switch 176 and engage a one-revolution clutch, Fig. 44 (not shown). The driven plate 182, Fig. 59, of this clutch is fast with rotary cams 190-194 referred to below and also, by means of a link, oscillates a mainshaft 110. Specification 645,004 also is referred to. Total or subtotal-taking occurs in known manner on rocking a control lever 54, Fig. 76, counter-clockwise or clockwise, such movement depressing the release link 512 and stud 518. If the add bar 50 is held depressed after an add operation, a total or subtotal operation will follow automatically according to the setting of a lever 60, Fig. 81. For this purpose, a latch 558, Fig. 84, engages beneath the stud 518 in the release link 512 and consequently a plate 542 to which the latch is pivoted is lowered by depression of the release link. The plate 542 is pivoted on a further plate 552 so that the latter is rocked counter-clockwise. According to the setting of the lever 60, a stud 565 in the plate 552 engages a notch 568 in a selector plate 570 or a stud 564 engages a notch 618. Thus a link 574 is rocked counter-clockwise or clockwise so as to be pulled down by a stud 578 in a plate 598 or pushed up by a stud 601 when the plate 598 is rocked by a mainshaft cam. The link 574 moves the control lever 54 to total or subtotal position. During total-taking, an ear 557 of a link 550 pivoted to the plate 542 blocks depression of the subtract bar 52. Total-taking is prevented when the pin-carriage is not in its initial position since in those circumstances, a member 456 coupled to the carriage is moved to allow a lever 464 to rock a shaft 478 carrying a lever 548 pivoted to the link 550 which is thus moved to the left. Such movement rocks the plate 542 so that downward movement of the stud 518 merely rocks the latch 558. A cam on the sequence shaft referred to below has the same effect. Control keys. Interlocks. The add and subtract bars 50, 52, Fig. 76, are interlocked by an arm 490. The total-and-subtotal lever 54 is locked by a latching lever rocked by a stud 626, Fig. 84, in the link 550 when the pin-carriage moves from its initial position. The same latching lever is rocked to effective position by operation of a non-add control lever 56, Fig. 4, which is itself interlocked by a further latching lever with a control lever 66 moved forwardly for division and rearwardly for multiplication. A total-transfer key 68 is freed for operation only when the lever 66 is set for multiplication or division. The latter is locked during such an operation by a stud 730, Fig. 30, in a lever 728 released by a lever 720 controlled by cams on the sequence shaft described below. Also during multiplication or division, the amount keys are locked by means of a lever which is controlled by cams on the sequence shaft and co-operates with a bail associated with the keys. The same bail is locked during entry operations by a cam-controlled arm. Non-add. Rocking of the control lever 56, Fig. 68, clockwise rocks a plate 868 which disengages a driving pawl 875 from a stud 877 by which the totalizer C is normally engaged. Symbol printing. Multiplication and division symbol type on a special carrier are set by operation of the control lever 66. A register (operation counter). The A pinions 204, Figs. 4, 14 and 16, are mounted on a shaft 266 so as to be held against lateral movement and are engaged by detents 206. When a pinion moves from zero position, a lug 212 thereon allows a slide 210 to move to the position shown into the path of a stop 216 on a rod 218 secured in the B register carriage. The stop 216 is rendered effective in multiplication by a cam 22 on the sequence shaft referred to below acting through levers 230, 238 to rock a lever 226 in which the rod 218 is non-rotatable. The slides 210 arrest the B (multiplicand) register in turn at the denominational positions corresponding to significant digits of the multiplier which is entered into the A register. Counting (additively in division, subtractively in multiplication) is effected by a pinion 1128 on a square shaft 1126 rotated as described below. The pinion is moved laterally with the B register carriage by a rod 1130. A lostmotion connection 269 between the B register shaft 268 and the carriage frame 220 ensures that in the normal position of the carriage, the pinion 1128 is not engaged with the units A pinion 204. The A register is engaged with the extensions 892 of the actuators by a toggle linkage. When the register is cleared, lugs 213 abut fixed projections. B Register. The B pinions 205, Figs. 4, 14 and 19, are mounted on a shaft 268 in a carriage 220, 222 so as to be movable therewith. When a pinion moves from zero position, a lug 219 releases a slide 282 as shown. The slides 282 co-operate in division with dividend stops 388 in a frame 390 to control the lateral positioning of the B register. The carriage may be moved to the left against the action of a spring 264 by a lever 338, Fig. 59, engaging, by a stud 342, a bar 258 of the carriage and rocked by a bail 314 resiliently coupled to a cam-controlled lever 294. For this purpose, a stud 318 in the bail 314 is engaged with the lever 338 by vertical movement of the bail which is effected by a cam on the sequence shaft. A rack bar 256 co-operates with an escapement mechanism, Fig. 22, to control the return movement of the carriage in division. The B pinions are engaged with the actuator extensions 892 by a toggle linkage and are aligned by a bar 208, disengaged during the rearward stroke of the actuators and again during their return stroke by a mainshaft cam acting through a slide 1206, Fig. 75. When the register is cleared, lugs 217 engage fixed projections. When the register is engaged, the pinions 205 to the left of the actuators engage a fixed bar. Sequence shaft. Sequence control in multiplication and division is effected by a shaft 112 having eleven control positions and bearing thirty-three so-called " cams " for conditioning various mechanisms during appropriate cycles. Certain of these sequence cams are effective only in division and others only in multiplication, the shaft 112 being moved laterally by the wedging action of a lever rocked when the control lever 66 is set for multiplication. The shaft 112 is advanced by a pawl 790, Fig. 45, which is actuated by the mainshaft 110 and engages a " cam " or ratchet wheel 14 on the shaft having two short and three long teeth. The pawl is lowered into effective position by a stud 422 in a lever 420, Fig. 39, when the control lever 66 is set for multiplication or division, but is additionally controlled by a stud 472 in a lever 436 so that when the latter is in raised position, the pawl can engage only the long teeth of the ratchet-wheel. The stud 472 is lowered to permit engagement with all of the teeth when the pin-carriage moves from zero position. In these circumstances, the lever 436 is allowed to rock by the movement, along a cammed end of the lever, of a pawl 458, Fig. 53, carried by a lever coupled to the pin-carriage. The sequence shaft is also controlled by the engagement with a " cam " star-wheel 1, Fig. 41, on the shaft, of a roller 794 in a spring- loaded lever 796 carried by a plate 800. Three slides, e.g. 928, Fig. 30, controlled by rotary cams, e.g. 192, are each released for operation by a corresponding pair of cams during appropriate cycles in multiplication and division operations to engage the B register by acting on a stud 924 in the centre of a toggle linkage adapted to raise the B register. The slide 928 is released by cam 6 in multiplication and cam 7 in division and the rotary cam 192 is formed to engage the B register in entry timing, i.e. during the return stroke. The two other B register slides are actuated in subtotal, and total or clearing timing respectively. Similarly, the A register may be engaged in either clearing or entry timing by two further slides released for operation by further cams on the shaft 112. The add slide 928 for the B register is additionally controlled by an ear 936 of a lever 934 which follows the lever 436 and consequently allows movement o