Patent GB-190609360-A (GB)
Title: An Improved Adding Machine.
Inventor: LINDNER MARTIN
Filed: 1906-04-20
Granted: 1906-09-27
Abstract: 9360. Lindner, M. April 20. Calculating-apparatus; counting- apparatus. - I n a single-bank,key set and operated calculating - machine, the differential setting-mechanism is operated by four keys, which are coupled by an art angement of levers to the ratchet feed for the master setting - wheel in such a manner that by various combinations of the keys the nine different digits may be set. The master setting-wheel 6 is feathered on the e main driving-shaft 4, and engages in turn with the wheels 2 of the totalizing-counter. The improvements relate to : (1) the lateral spacing-mechanism for the master setting-wheel, with associated zeroizing and interlocking arrangements ; (2) the detent and transfer parts ; and (3) the differential setting-mechanism. (1) The counter-wheels are combined pinions and numeral wheels, and the initial position of the setting-wheel, which is coupled to a carriage 8 laterally movable upon a transverse guide, is opposite an auxiliary wheel 3, which may be employed in positively zeroizing the counter. A finger-wheel 37 upon the spindle of a worm 21 is rotated through ninety degrees for each step of the setting-wheel to the left, motion being conveyed through a rack 20 and an angle-lever 16, 15 to the carriage ; by depression of the fingerwheel, however, the spindle is rocked to disengage the worm from the rack and allow a spring return of the setting-wheel. To ensure correct settings of the wheel, a spring bears upon a square cam on the spindle and an interlock is provided which prevents depression of the finger-wheel except at an exact setting. (2) The depression of the spacing finger-wheel is also arranged to swing downwards a yoke composed of the bars 74, 36, Fig. 8, and thus to throw out of engagement all the roller detents 33 carried by the transfer levers. By an interlocking action of the arms 35, 44, Fig. 11, the levers are held down until the setting-wheel moves into gear with the units' numeral-wheel. As shown in Fig. 8, the snail-cams which gradually force down the transfer levers are waved so as to act also as detent-wheels, and their weight automatically zeroizes the numeral-wheels, which are loosely mounted upon the main counter-spindle, whenever the detents are thrown out of gear. To each transfer lever is pivoted a weighted pawl 47, which at transfer moves upwards against the bar 36 and turns the next higher wheel. (3) The main driving-shaft 4 receives motion through gearing from a shaft carrying a ratchet-wheel 51, which is turned through varying angles upon the upward stroke of an adjustable pawl-lever 52, descending by gravity when its forward end, which rests upon a lever 60 pivoted at 59, is allowed to fall by the indirect action of the keys upon this lever, and returning with it. Fig. 5 shows the system of compound levers interposed between the operating knifeedges of the fixed. stroke plunger keys and the supporting-lever 60, the ratios of the arms being chosen to get the required differential movements As the supporting-lever moves down, the camsurface 61 depresses the spring-controlled returning-arm 62, the form of the cam being such that the displacement of the returning-arm is proportionately greater for small movements of the supporting lever. The main driving - shaft is normally locked until the pawl lever descends, and its revolution is steadied by an air-vane. On the casing of the machine are provided a punctuation indicator and an index hand showing the position of the setting-wheel.