Patent GB-191512527-A (GB)
Title: Improvements in or relating to Adding or like Machines.
Inventor: WADE HAROLD
Filed: 1915-08-31
Abstract: 12,527. Wade, H., [Burroughs Adding Machine Co.]. Aug. 31. Adding and subtracting apparatus with operating-means; transfer and zeroizing mechanisms.-In an adding- machine of the type set forth in Specification 3259/03 having transfer mechanism involving the use of sun- and-planet gearing as described in Specifications 24,996/11 and 6/15, means are provided whereby the transfer mechanism may be so adjusted as to enable the machine to perform subtraction. The totalizing- counter A, Fig. 1, is actuated by rack-bars 3 adapted to be engaged with pinions Q ; the rack-bars are suspended by links 5 and are restrained in known manner against the action of springs 15 by a bail 16. Fig. 6 is a diagrammatic representation of the counting-mechanism described in Specification 6/15 modified to enable subtraction to be performed. The links M by which the rockers H are connected to the gear-carrier L are made with slots M<1> embracing studs L<1> on the gear - carriers, a tension spring J<1> also connecting the stud L<1> with a stud H<2> on the rocker H. A shaft S is provided with flats to engage extensions H<3> on the rockers H, so that when the shaft is tilted as shown, the rockers H are lifted, bringing 'the studs H<1> clear of the cams G, so permitting the numeralwheels to be turned backwards. This may occur either by direct actuation from the rack-bars, or for borrowing purposes by the lifting of the rockers H, the numeral-wheels being locked by their racks when the pinions Q are engaged with the rackbars, which is the condition whenever the subtraction lever is operated. If, as in the instance shown in Fig. 6, all the numeral-wheels are initially at zero, the result nf lifting the rockers is to turn all except the units-wheel to ''9." If, however, owing to any of the wheels not standing at zero, the corresponding studs H' are already partly raised, the backward movement transmitted to the next-higher order wheel will be something less than one-tenth of a revolution ; this one-tenth movement is completed gradually by backward turning of the lower order wheel from the position it occupies when the rockers are lifted to zero, the planet-pinions N, O serving merely as transmission gearing. The shaft S is rocked by a crank S', Fig. 8, connected by a link S<2> with a hand-lever S<3>, which is pulled forward when subtraction is to be performed. In adding, the rack-bars 3 are drawn forward out of gear with the pinions Q and are then engaged therewith by the upward movement of a series of arms 9, Fig. 12, connected by a rod 8 having anti-friction rollers 7 embraced by the forked ends 3<b> of the rack-bars. The arms 9 are fixed on a shaft 10, which is rocked by a lever 11 having a roller stud 11<a> engaging a cam-slot 17 in a pivoted plate 18. A rod 12, also passing through the arms 9, operates a series of pawls R, which lock the pinions Q when they are disengaged from the racks. The plate 18 is moved by a bar 19, the rear forked end of which rests on a rockshaft 20, Fig. 13, and to which is pivoted at 20<a> a pitman 21 having at its rear end notches 21<a>, 21<b> with flaring mouths 21<c>, 21d. A rocker 30 is provided with studs 30<a>, 30<b> adapted to enter the notches and to be engaged by a spring-controlled pawl 41 pivoted on an arm 40 secured to the shaft 20. The pawl 41 normally rests on the stud 30<b> as shown in Fig. 13, and in the first movement of the machine the shaft 20 is rocked clockwise by the operating-handle, thereby thrusting the pitman 21, together with the bar 19 and plate 18, rearwardly and lowering the rack-bars 3 out of engagement with the pinions Q previously to their being drawn forward. Continued upward movement of the arm 40 brings the pawl 41 into contact with the stud 30<a>, which has rocked to the position shown in Fig. 13<a>, and, on the return stroke of the arm, the plate 30 is restored to its first position, thereby thrusting the pitman 21 forward by means of the stud 30<b> and raising the rack-bars to engage the pinions Q. The rack-bars are then drawn back by the restoring-bail 16 operated by a cam on the shaft 20, thereby actuating the counters. The pitman 21 extends forward to engage a roller S<4> on the lever S<3>, so that when this lever is pulled forward for subtraction the rear end of the pitman is tilted upwards. By this means, the stud 30<a> and notch 21<a> are normally engaged, so that the rackbars 3 are raised during their forward stroke and lowered during their return ; finally, they are raised to re-engage the pinions by a branch 40<a> of the arm 40 coming in contact with a roller stud 19<a> on the bar 19. Printing totals.-For total-printing the pitman 21 is similarly raised by a total key 50, Fig. 16, pivoted on the shaft 20 and provided with a pivoted tappet 52 bearing on a stud 53 and also connected to it by a spring 54. Upward swinging of the tappet is prevented by a lip 52<a>, and a spring 55 is of sufficient strength to prevent its yielding when raising the pitman. The raising of the pitman permits the machine to be operated for total-printing in known manner by turning the registering gears backwards to zero while in engagement with the rack-bars. The numeralwheels are arrested in zero position by lugs 60, Fig. 8, carried there by striking stops 61 mounted loosely on a shaft 62 and drawn inwards by a spring 63. An arm 65 on the shaft 62 is formed with a cam-slot 65<a> engaging a roller stud 66 on the crank S<1>, so that when the machine is to be operated for subtraction, the stops 61 are rocked out of the paths of the lugs 60 by pins 62<a> on the shaft 62 abutting against yokes 61<a> on the stops. Printing sub-totals.-A sub-total key 70, Fig. 16, operates by depressing, by means of a lug 71<a>, the total key 50 ; a pin 71<c> on an arm 71<b> moving with the key 70, however, encounters a projection 21<g> on the pitman which thus assumes an intermediate position, so that the rack-bars remain in contact with their gears, both when the gears are turned to zero and back to their previous position. Interlocking.-Depression of the total key locks the sub-total key by means of a link 80 and a hook 81 taking over a stud 83 on a lower branch of the sub-total key-lever, and, similarly, a hook 84 upon the rock-shaft 20 prevents depression of either total key when an operation has begun, or the initiation of an operation with either key partdepressed. Like interlocks are provided between the subtraction and total keys.