Referring to [Fig. 1], it will be noted that to each type-wheel is geared a spring-actuated segmental rack marked D, which, as shown in the drawing, is in contact with a pin marked i, which protrudes from the side of the depressed number (9) key.
The normal position of the rack D, is indicated in dotted lines showing the next higher sector which has not been displaced by key depression.
Description of Pottin machine
Each key, as will be noted from [Fig. 7], is provided with one of the pins i, which is normally out of the path of the lug j, as the racks D, drop forward; but when any key is depressed the pin is presented in the path of the lug j, and stops further forward action of the rack.
It will be noted that the arrangement of the keys is such as will allow progressively varying degrees of action to the segmental racks D. This variation, combined with the geared relation of the type-wheels and racks is equivalent to a tenth of a rotation of the type-wheel for each successive key in the order of their arrangement from 1 to 9.
The means provided for holding the segmental racks D, at normal, also serves to hold a key of the same order depressed, and consists of a pivoted spring-pressed latch-frame marked E ([see Figs. 7 and 8]).
With such a combination, the depression of keys in the several orders will unlatch the segmental racks, and the racks, through the tension of their actuating springs, will turn the wheels and present a type corresponding to the numerical value of each key depressed.
A hand lever, marked R, located on left side of the machine provides power for printing the items. Another hand lever, marked J, serves to restore the segmental racks, type-wheels and the keys to normal, and through the co-operation of the lever R, adds the items to the totalizer numeral wheels, which are shown in [Fig. 1] as the numbered wheels marked v.
The paper is supplied from a roll mounted on a hinged platen frame P¹, supported in its normal position by a spring P³. The paper passes under the roller P, which acts as a platen for the impression of the type. A shaft Q, passing under the frame P¹, is fast and rigidly connected on the left-hand side of the machine with the hand lever R, and acts as a pivot for the said lever and by means of lateral projections q, serves when the lever R is operated to engage the frame P¹, and depresses it until the needle types have pricked the numerical items through the paper.
A slit in the casing provided means for printing the item on a separate piece of paper or bill.