Patent GB-136629-A (GB)
Title: Improvements in or relating to Calculators.
Filed: 1918-12-17
Abstract: 136,629. Clarke, F. M. Russell-. (Executrix of Clarke. E. Russell-). and Autokal Syndicate. Dec. 17, 1918. Adding and subtracting apparatus for monetary values, with operating-means.-In an adding and subtracting machine, items are set upon the machine by the depression of keys and levers or other mechanism adapted to set a series of templets in accordance with the value of the keys depressed and the subsequent movement of the operating- mechanism causes (1) each of the totalier numeral wheels, provided with double pinions and mounted on movable members, to be lowered and thereby disengaged from one of a pair of a series of toothed sectors mounted concentrically on levers, (2) the simultaneous re-setting of the transfer parts, and (3) the release of the sectors, which are thereby allowed to fall to a position determined by the setting of the templets, whereupon further operation, i.e. the second half-cycle, effects (4) the movement of all the totalizer,wheels upwards or downwards, according as addition or subtraction is being performed, so as to engage the corresponding toothed sector, (5) the return of the sectors to their initial position to rotate the totalizer-wheels', and (6) the necessary transfers, by allowing the sector of next-higher denomination in each case an additional unit movement beyond its initial or zero position. Adding and subtracting.-The curved toothed sectors A, B, adapted for addition and subtraction respectively, are mounted on levers C pivoted at C<2>; normally engaging each sector A is a double pinion G, G<1> carried by a totalizerwheel G<2> which is mounted on a movable plate E pivoted at D', the free end of which is slotted to engage a pin on a lever F' secured to a shaft F<2>. Each totalizer-wheel G<3> has a notched flange, and a projection D<4> on a bar D<2> is adapted to engage one of the notches to lock the totalizerwheel when the plate E is lowered into its intermediate position; but the wheel is free to move in the highest and lowest position of the plate. One of the notches is cut deeper than the rest, and extending therethrough is a detent G<5> which engages a plate D<5> in the zero position of the totalizer-wheels. The levers C are supported by a bar K pivoted on the shaft C<2>, and the withdrawal of this bar by the rotation of the shaft C<2> allows the sectors to fall until arrested by the finger L<1> of a lever L engaging one of the steps of a templet M. The levers L, mounted loosely on the shaft C<2> and adjacent each lever C, are connected thereto by a spring L<4>, Fig. 9, through a pin C<7> and slot L<2>, this spring tending to move lever L towards the bar K. In an arrangement as shown, the templet M is rotated by a flexible band attached to the templet and fixed at the other end, and which passes over a guide-pulley Q mounted on a slide which receives movement from the keylevers or other means. The construction of the lever C and connecting parts for the unit of highest denomination is as shown in Fig. 10; in this instance, no templet is provided, and the lever L is replaced by a bell-crank lever L<6>, the lever C being retained in its raised position by the end S<2> of a lever S, pivoted to the bar D<1>, engaging a gap in the toothed sector B, which is sufficiently long to permit of the additional movement of the levers C beyond the zero position as required in the transfer operation. A projection S<3> on the lever S rests on a lever R which is adapted to raise the lever S and free the sector when the totalizer-wheels are to be zeroized. Transfer-mechanism.-On the plate E is pivoted a lever E<5> which is provided with an arm E<6> extending through a slot in the plate and normally engages projections E<11>, E<12> on a detent E<10>, which is adapted, at the moment of transfer, through a pin G<8> on the totalizer-wheel, to rock the lever E<5> and thereby move the arm E<6> out of engagement with the end of a lever H. The lever H is pivoted at E<14> and has a projection H' which, in the normal position, as shown in Fig. 4, lies in the path of a projection C' on the lever C of next-highest denomination, which is allowed an additional movement when the projection H<1> is removed. Re-setting of the transfer parts is effected after the totalizer-wheels have been disengaged from the toothed sectors A by rocking a shaft J which, through levers J<1>, J<2>, returns the lever H, and, at the same time, the end J<4> through the pin C<6> returns the lever C to its initial or zero position, when the projection C<4> will engage the projection H<1>. Zeroizing-mechanism. - The totalizer-wheels are first disengaged from the sectors A and the transfer parts re-set as above described; they are then moved into engagement with the sectors A, and these sectors are allowed to fall until arrested by the detent G<5> engaging the bar D<5>. The totalizer-wheels are again disengaged, and the sectors are returned to their initial position. In order that the toothed sectors may fall to their full extent, the templet M must be rotated backwa.rds so as to present the deep notches M<2> to the levers L<1>; this movement is effected by the lever R and a lever Q<3> acting upon the guidepulley Q. Operating-mechanism. - On a power-driven shaft T, two cams J<5>, K<1> are fixed, and keyed on the shaft is a boss T<1> to which are attached four cams U, V, W, W<1>. The cams J<5>, K<1> are always in operation and control the movements of the shafts J, C<2> through arms J<5>, K<2>. The boss T<1> is adapted to be shifted axially into three positions; the first or mid position is for addition, with the cam U operative, the left-hand position for subtraction with the cam V operative, and the right-hand position for clearing the machine and returning the totalizer-wheels to zero, with the cams W ,W<1> operative. To the shaft F<2> which rocks the plate E are fixed two arms F<5>, F<6>; the arm F<5> engages the cam U in the adding position, and the arm F<6> has two rollers F<7>, F<8> adapted, when the boss T<1> is shifted, to engage the cams V, W respectively. When the roller F<8> engages the cam W, a lever R<2> on the rock-shaft R<1> is in position to engage the cam W<1>. The clutch, which transmits power from the pulley X through gearing to the shaft T, is controlled by a key Z and is arranged preferably to be automatically disconnected on the completion of each half-cycle of the shaft T.