Patent GB-741583-A (GB)
Abstract: 741,583. Calculating-apparatus; transfer mechanism. BURROUGHS CORPORATION. June 16, 1953, No. 16544/53. Class 106 (1). In a calculating-machine having stops for the differential racks, releasable upon transfer to permit an extra step of return movement by the racks, and latches for the stops tripped by interponents operable by the lower order totalizer wheel, pressure of the racks on the stops urges the stops to move into their transfer positions, the racks moving progressively with their stops when released. Differential mechanism. The embodiment shown has ordinal differential slides 31 adjusted under key control upon forward movement of a longitudinally reciprocable main actuating member 25 (part shown in Figs. 2 and 18). Type bars 20 are adjusted with the slides through bell-cranks 27; the slides and bell-cranks are connected with the actuating member through individual springs 36, 33, movement of the bellcranks being delayed by latches 29 tripped by the slides as they advance. Upon return of the actuating member, a universal bar 32 restores the slides and bell-cranks, a bar 38 imparting additional movement to the bell-cranks in order to relatch them. Branched rear ends of the slides terminate in T-heads 74 connected with racks 75 adapted for engagement with the pinions 60, 64 of upper and lower totalizers. Totalizer engagement; add/subtract arrangements. Each rack 75 has upper and lower rack sections, and the totalizer is raised or lowered to engage one or other rack section during return movement of the rack according to whether the machine is set for addition or subtraction. The totalizer shafts 58, 62 are supported between the ends of vertically movable links 57, 61. A pin 45 on one link 57 and a pin 53 on an actuating disc 50 are embraced by a pair of semi-circular levers 55, 55a resiliently drawn together by a spring 56. Similarly, a pin 48 on one link 61 is resiliently coupled to a second pin 53 on the actuating disc. Counterclockwise rotation of the actuating disc 50 from the normal position shown (Fig. 13) results in inward movement of the two totalizers to engage their respective inner rack sections for additive actuation, whereas clockwise rotation of the actuating disc engages the totalizers with their outer rack sections for subtractive actuation. The actuating disc 50 is operated by a rearwardly reciprocable link 116, a lower slot 134 of which normally engages a lower pin 52 on the disc so that the disc is oscillated counterclockwise and back for engagement of the totalizers with their inner add rack sections. A subtract control lever 125 (key or carriage actuated) is adapted to raise the link 116 to engage an upper slot 134 with an upper pin 52 of the disc 50 which is then reversely oscillated so as to engage the totalizers with their outer subtract rack sections. The engagement movement of either totalizer can be suppressed, the corresponding spring 56 yielding to movement of the pin 53 of the actuating disc. The rearward reciprocation of the link 116 is effected from the main actuating member 25 by connection with a lever 119 (Figs. 10 and 18) pivoted at 120 and having studs 142, 148 engaged by hooked links 141, 147 connected to bell-cranks 139, 145 rocked by cams 137, 143 on the actuating member 25. Totalizer alignment. Transverse aligner rods 65 normally engage the totalizer pinions under the action of springs 66 (Fig. 13). Slots 68 in the links 57 or 61 embrace the ends of these rods, and the rods also engage cam slots 67 (Fig. 2) in the side frames of the mechanism. As a result, the rods are cammed clear of the totalizer pinions when the latter are moved by their links to engage either the inner or outer rack sections. Transfer mechanism. The normal rearward home position of the racks 75 is defined by engagement with stop faces 85 on sets of rockers 82 freely pivoted on shafts 83 and normally latched against movement by individual latches 86. The T-heads 74 of the differential slides engage between spaced lugs 78 on the racks 75 and springs 79 between the heads 74 and their racks urge the racks rearwardly beyond the home position, such further rearward movement being prevented by the rockers 82. Associated with each rack is a longitudinally slidable interponent 92 having branched forward ends 93 each formed with a tooth 95 (Fig. 8) adjacent and in register with the add and subtract rack sections respectively. At transfer, a long tooth 91 of the lower totalizer pinion engages the interponent tooth 95 and displaces the interponent momentarily rearwardly against a spring 98. A lug 99 on the displaced interponent trips the latch 86 in the next higher order, and the rocker 82 in that order immediately pivots under the action of a spring 90 and pressure of the rack 75 to present a more rearward stopface 84 to the rack, so permitting the rack an additional step of rearward movement to advance its totalizer pinion by one unit. Unlatched rockers 92 are restored by rods 107 carried between pivoted arms 106 and connected by a spring 109. A sheave 110 engages a loop in the spring and is carried by a lover 101 connected to the main actuating member 25 so that, as the latter moves forwardly at the commencement of the next operation, the rods 107 are moved rearwardly to restore the rockers into latched engagement with their latches. Rods 112 are similarly actuated to restore the racks forwardly.