Patent GB-730465-A (GB)
Abstract: 730,465. Transfer mechanism; calculating-apparatus. SOC. ANON. DES BREVETS LOGABAX. Aug. 7, 1951. [Feb. 12, 1951], No. 18625/51. Class 106 (1). Each order of tens transfer mechanism for a calculating machine having totalizers formed by longitudinally movable parallel slides comprises two bars released at transfer for longitudinal movement by springs and having cam surfaces so that when so displaced they also move in a perpendicular direction, one bar acting to release the associated totalizer slide for return to its zero position and the other effecting the advance of the next higher order slide by one step. The machine described is generally similar to that. described in Specification 647,520. It has two sections each of ten totalizers. Keyboard. The machine has several columns of amount keys 114, Fig. 2, a column of totalizerselecting keys 93, Fig. 1, for each of the two sections of the machine, and a column of function-selecting keys 92, Fig. 4. Each amount key comprises a stem 154, Fig. 13, slidable in a frame 153 and urged upwardly by a spring 159, the movement being limited by a rod 341. In each order, a detent bar 336 co-operates with notches in the stems 154 and is rocked by a slide 338 after printing has occurred to release the depressed keys. The next item may then be set before the end of the cycle since auxiliary stems 155, urged to follow their main stems 154 by springs 157, actually co-operate with the stop-bars and are temporarily cammed upwardly by the latter as they are returned, the lower ends 161 of the auxiliary stems being bevelled for this purpose. A longitudinallypivoted bar 339 in each order co-operates with further notches in the stems 154 to rock a zero stop from the path of the associated stop-bar when a key is depressed. Specification 730,466 is referred to. Totalizers. Each totalizer comprises racks 12, Fig. 5, guided by pins 11 in slides 10 supported in a frame 9. Two frames 9, Fig. 1, corresponding with the two sections A<1>, A<2> of the machine, each accommodate ten totalizers. Each totalizer is normally held by springs 64 so that teeth on the racks 12 are engaged by locking-bars 65, but the totalizer may be shifted by means of a plate 13 engaging pins 14 in the slides 10 to engage further teeth on the racks with driving members 98, equal in number to the racks, by which the slides are moved longitudinally. Totalizer-selection. Depression of a key 93, Fig. 1, selects a corresponding totalizer of the front section A<1> for actuation. A totalizer in the rear section A<2> may be similarly selected by depressing a key in a second column of selecting keys. A stop-bar 28 associated with the keys 93 is freed for rearward movement to a position determined by the depressed keys by a bar 30 mounted between cam-controlled slides 31. The stop-bar is driven rearwardly by a spring 164, see also Fig. 16, acting on a slide 22 carrying a stud 23 which drives the stop-bar through a lever 25. Teeth on the slide 22 mesh with a pinion 21 on a shaft 16 carrying ten helically arranged radial pins 15, one of which is thus aligned with a nose 180 of the plate 13 of the corresponding totalizer. The rack 22 and shaft 16 are mounted in a frame 17 rockable about a shaft 20, and in order to engage the selected totalizer with its driving members, this frame is rocked as described below. Furiction-selection. The machine normally adds unless a different operation is selected by depression of one of a column of keys 92, Fig. 4, comprising a subtraction key and total and subtotal keys for the front and rear sections respectively. A stop-bar 91 co-operates with these keys and positions, through an extension 90 and a lever 87, Fig. 16, a slide 82 in accordance with the depressed key. A notch 85 in the slide 82 is thus positioned to free a selected one of five levers 73, 74, 73<1>, 74<1>, and 75. The levers 73 and 74 are pivoted to a control bar 67 controlling the engagement of the front section totalizers, while the levers 73<1> and 741 are pivoted on a control bar 68 associated with the rear section. The lever 75 is pivoted to a bar 69 which controls the subtraction operation in both sections. When one of these levers is released by the slide 82, it is urged upwardly by a spring and a projection 185 thereon is engaged by a flange 81 formed on a cam lever 78 which drives the lever and the control bar on which it is pivoted forwardly. Addition. After the bar 30 has moved rearwardly to enable the totalizer selecting mechanism to operate, a cam rocks a shaft 146, Fig. 2, carrying aligning pawls 147 to disengage them from teeth 145 in driving bars 103 and a further cam controls a cross-bar 137 to allow the driving bars to move rearwardly under the action of springs 135. Each driving bar 103 is coupled by a pin 134 to a corresponding stopbar 113 which co-operates with the keys of the corresponding order to position the driving bar differentially. The aligning pawls 147 are then re-engaged with the bars 103 and the selected totalizers are engaged by the operation of a cam which momentarily rocks locking levers 53, Figs. 1 and 16, one of which is associated with each section. Thus, the levers 53 are moved from the paths of noses 181 formed on the frames 17 and the latter are rocked about the shafts 20 to engage the selected totalizers by springs 42 previously tensioned by a cam which moves to the rear (left, Fig. 16) a bar 45 carrying slides 43 to which the springs 42 are secured. When the totalizers have been engaged, the cam releases the bar 45 but the slides 43 are unable to return, being held by springs 46 so that their ends 44 abut studs 41 in the frames 17 which are held in the engaged position by the now restored locking levers 53. The cross-bar 137 is then restored to return the driving bars 103, each of which is connected to two driving members 98 by pawls 107, 108 on levers 104 pivoted to the bar which engage lugs 126 on the members 98. The driving members 98 and consequently the totalizer racks 12 are thus advanced by amounts determined by the depressed keys. If during its advance, a rack 12 reaches its end position, it is immediately returned to its initial position and re-coupled to the corresponding member 98 by the transfer mechanism described below. After the driving bars have been restored, the locking levers 53 are again momentarily rocked to allow the springs 46 to return the slides 43 and rock the frames 17 to their normal positions to allow the totalizers to be disengaged. Transfer mechanism. When a rack 12, Fig. 5, reaches its end position, a shoulder 120 thereon rocks a shaft 119 for that order coupled to a stop 117, Fig. 7, which is thus moved from the path of a bar 111. A spring 112, Fig. 11, is thus able to move the bar to the right (forwardly) and surfaces 100 on the bar co-operate with the frame in which it is mounted to cam the bar bodily upwards. A slot in the bar is engaged by a pin 109 in the pawl 108 so that the pawls 107, 108 carried by the associated driving- bar 103 are uncoupled from the lug 126 of the driving member 98. The latter is then driven to the left (rearwardly) by its spring 128 until a second lug 127 thereon, spaced from the lug 126 by a distance representing ten units, is engaged by the pawls. Each bar 111 has a projection 115 acting as a stop for a transfer bar 106, Fig. 9. Consequently when the bar III moves forwardly, a spring 110 moves the bar 106 forwardly and, due to similar cam surfaces 100, upwardly. A slot in this transfer bar is engaged by a pin 105 in the lever 104 pivoted on the driving bar 103 of next higher order. The lever 104 is thus rocked to drive the pawls 107, 108 carried thereby, and consequently the driven member 98, through an additional step to enter the transfer unit. The operated bars 111, and consequently the corresponding transfer bars 106, are restored at the end of the cycle by prongs 172 on a shaft 171 controlled through an arm 169, Fig. 1, by cam surfaces 168 on the cam-controlled slides 31. The released driving members 98 are restored by cross-bars 167 (front section) and 167<1> (rear section) secured to the slides 31. Subtraction. Fugitive one arrangements. When the subtraction key has been depressed, a corresponding control bar 69, Fig. 4, is moved forwardly as described above. A lug 186, see also Fig. 8, on this bar rocks a latch 187 to free a frame 190 in which the amount stop-bars are mounted for lateral movement by a spring 193. Complementarily arranged stops are thus arranged to co-operate with the keys, so that the nines complement of the amount set up is added into the selected totalizers. The frame 190 is restored at the end of the cycle by a lug 198 on the function-control stop-bar 91 which rocks a lever 199 engaging a nose 200 of the frame. In order to convert the nines complement to the true complement and to allow for the fugitive one when a totalizer passes through zero, the stop 117, Fig. 7, of the highest order is coupled by a link 122 to a stop 1117 co-operating with a bar 106 associated with the lowest order. Specification 647,520 also is referred to.