Patent GB-191124565-A (GB)
Title: Improvements in or relating to Adding Machines.
Inventor: WHEAT FREDERICK
Filed: 1911-11-04
Granted: 1912-11-04
Abstract: 24,565. Wheat, F. Nov. 4. Adding-apparatus for avoirdupois values; transfer mechanism. - Machines of the Burroughs type, in which transfer is effected by an additional movement at the end of the return stroke of the actuating-racks, as described in Specification 17,126/93 are adapted to compute according to the avoirdupois table of weights by a modification of the transfer mechanism associated with three wheels of a set of accumulating wheels, so that the intermediate wheel can effect a carry or transfer to a wheel of lower denomination, as well as to the higher wheels in the ordinary way, provision being made for a double or two-step transfer to the lower wheel. The denominations affected in the present instance are the quarters, and tens and units of pounds, the units of pounds wheel 916<a> having ten teeth and carrying to the tensof-pounds wheel in the usual way. Additional transfer operations are necessary when (1) the ' 2 ' key in the tens position is depressed after the registration of ' 8 ' in the units position and vice-versa, (2) when the ' 1 ' key in the tens position is depressed three times in succession, the numeral standing on. the units wheel being ' 8 ' or less, and (3) when the ' 9 ' key in the units position is depressed, the wheels having already registered 19 pounds. (1) The rack of the units wheel has a slot b which is double the length of the usual one in order to allow a two-step movement to the units wheel. The transfer pawl 413<a> for the lowest denomination is displaced or rocked by a finger A mounted on a rock-shaft B which is rocked by means of arms C, D adapted to engage a cross-head B<2> mounted on an arm of the shaft B. The movement of the arms C, D is controlled by the units and tens wheels respectively, and the arm C is normally out of contact with the cross-head B<2>, but when the units wheel registers '8,' a pin c<2> on a cam-disk 912<a> engages the eccentric part c<1> of the arm C and moves it into contact with the cross - head. Registration of ' 2 ' on the tens wheel causes pins d thereon to move the arm D and thereby rock the cross-head about the arm C, and consequently rock the shaft B and finger A, thus releasing the pawl to allow the units wheel to advance two steps. This movement of the units wheel to the zero position then advances the tens wheel to zero. (2) When the tens key ' 1 ' is depressed in succession, the finger A is rocked by means of an extension D' on the arm D, which is set so as to rock this shaft only after ' 2 ' has been registered on the tens wheel. (3) To ensure a two-step advance of the tens wheel after depressing the ' 9 ' key, the tens rack is provided with a slot e equal in length to the slot b, and a pawl E is provided to limit the rise of the rack to one step when necessary. The pawl E is pivoted concentrically with the pawl 413<b>, and is normally held against the forward end of the pawl. The pawl E is adapted to be rocked by means of an arm 413<g>, which is pivoted to the pawl at e<3> and to the framework at f. The rearward swing of the pawl 413<b> rocks the pawl E, and thereby moves the foot of the arm 413<g> into the path of the cam 912<a> which rocks the arm and swings the pawl E away from the pawl 413<b>, allowing the corresponding rack to rise to the full extent. Varying functions of machine.-The machine is split between certain denominations by omitting the overlapping tails of the units of tons, units of hundredweights, and the quarters hammer latches, whereby the printing of the ciphers is controlled. The type sectors for the units and tens of pounds have the type arranged a step lower down on the sectors, owing to the corresponding racks having slots of double length. Keyboard interlocks. - To prevent the depression of the ' 2 ' key in the tens position and the ' 9 ' key in the units position at the same time, a locking-strip S, Fig. 19, extends between the two keys and is arranged to slide lengthways. The keys act upon bell-crank levers 217 which are provided with pins 217<a>, 217<b> to co-operate with the cam-shaped ends s, s<1> of the slide S.