Patent GB-191403084-A (GB)
Title: Improvements in Adding Machines.
IPC: G06C11/04
Filed: 1914-02-05
Granted: 1915-02-04
Abstract: 3084. Marks, E. C. R., [Addometer Corporation]. Feb. 5. Adding - apparatus with operating - means; adjusting for computing or recording only; controlling printing of zeros; differential mechanism; distinguishing-marks. - Relates to a printing' calculating-machine in which any one of a series of special keys, such as a totals key, suh-totals key, non-adding key, and a non-printing key, when depressed instantly causes a characteristic sign to be printed before any movement is given to the main handle to effect the actuation of the totalizer and the ordinary item-printing devices. Each numeral key is adapted to project a stop 33, Fig. 7, into the path of a projection 32 on a corresponding rack and typeplate 7 which is normally held down by means of a universal bar 37 mounted on a shaft 21 connected by an arm 38 to a side member 39 that is adapted to rock the shaft when the main handle is operated and thereby raise the universal bar and permit the rack and typeplate to be drawn upwards by its spring until arrested by the projected stop. Each typeplate 7 is provided with a notched extension 26 whereby the type-plate can be locked in its set position just before the printing-operation by the engagement of a locking-bar 47 with one of the notches. The locking-bar is mounted on arms 48 which, at the end of the upward movement of the universal bar, are engaged thereby to swing the locking-bar into one of the notches. The printing-hammers 9 are mounted on a shaft 10 and each is adapted to be swung, aga.inst the action of a spring- controlled lever 11, by means of a trigger 18 mounted on a spindle 17 carried by the rockshaft 21, so that each item is printed upon the operation of the main handle. In the normal position of the type-plates pins 27 on the extensions 26 hold the triggers free from the tips 19 of the printing-hammers and thus control the printing of zeros. To prevent operation of the hammers when an item is to be added and not printed, the triggers are held down by a bar 52, Fig. o, mounted on arms 53, which locks the triggers in this position when a stop-arm 56 is moved into the path of an ear 55 on an arm 54. At the left-hand side of the machine is a bar 60, Fig. 3, which, on the depression of a totals key 65, a subtotals key 67, a non-adding key 70, or a non- printing key 73, is rocked and moved rearwardly to a varying extent, and thereby rocks a crankarm 61 mounted on a shaft 57 which carries the stop bar 56; the non-printing key moves the stop arm sufficiently to engage the arm 54. On the shaft 57 is fixed an arm 77 which carries a type plate 76 having four special types a, b, c, d, to print a characteristic sign opposite a non-printed item, a non-added item, a subtotal, and a total respectively when the corresponding key is depressed. A printing-hammer 78 and trigger 81 are provided, similar to the hammer and trigger for the numeral type, but a latch 82 is adapted to hold the hammer tripped, which is the normal position, until the end of the downward swing of the bar 60, i.e. after the type-plate 76 has been set, when an arm 85 on a shaft 86 to which the bar 60 is pivoted is rocked to trip the latch and thus effect the printing of the characteristic sign before the operation of the main handle.