Patent GB-107403-A (GB)
Title: Improvements in and relating to Adding and Listing Machines.
IPC: G06C7/08
Filed: 1916-06-21
Abstract: 107,403. Marks, E. C. R., (Rockford Milling Machine Co.). Juno 21, 1916. Adding-apparatus with operating-means; controlling printing of zeros; selecting denomination; multiplying by repetition; interlocking; error keys. -In single-bank, key-set, lever-operated adding and printing machines having keys 0-9 operating vertically moving type bars bearing corresponding type, the upward movement of the type-bars on the operation of the main shaft is limited by series of horizontally moving, vertically-arranged stops corresponding in number to the type-bars and having, in each series, one stop less than the number of keys, the casing carrying the stops serving as an additional stop. Extrusion of the stops is effected by a single vertically arranged set of fingers operated by the depressed keys and adapted to be moved step by step across the face of the stops. The type-bars 3, Fig. 1, bear angle-arms 15 adapted to pivot about a vertical axis and provided with projections engaging slots in vertically moving pins 16 carried by a frame 17 adapted to slide on a fixed rod 18. The frame 17 moves across a vertically-arranged series of adjustable horizontal stops 12 carried in a fixed frame 13 and provided with spring retaining-detents, the stops serving to limit the upward movement of the pins 16, and there being one row of nine vertical stops for each numerical order. The lowest row of the stops 12 corresponds to ciphers and the top of the frame 13, Fig. 9, acts as an additional stop corresponding to the numeral nine. The type-bars are always in a position to print ciphers and any bars 16 not required in the printing of the item are locked in the lowest position by a plate 18a which is moved over them on the first longitudinal movement of the frame 17 by a roller 17<a> thereon striking a bar 18f of a spring-controlled rocking frame 18<c>, Fig. 4, connected by a link 18b to the plate 18<a>. Extrusion of the stops 12 into the path of the pins 16 is ejected on the depression of numeral keys 19 by inclined projections 24 on the keys, adapted, in the case of the three highest keys, to rock levers 26 pivoted at 27 and, in the case of the remaining keys, to reciprocate slides 28 connected to levers 26. Fingers 35, Fig. 4, pivoted to the levers 26 are carried bv a bracket 32 that is pivoted at 33 and moved by its spring 38 step by step across the face of the stops 12 and is connected by a pin and slot 36, 37, Fig. 10, to the frame 17. Of the fingers 35, all, save the top one, are adapted to extrude a corresponding stop 12, the top one serving to rock a spring-controlled ratchet-toothed sector 39, Fig. 3, to produce an intermittent movement of the bracket 32 and the frame 17. The sector 39 is rocked by the top slide 35 sufficiently far to allow a tooth 34a on the bracket 32 to escape to the next tooth of the sector. Movement of the top finger 35 on the depression of any key is ensured by a universal bar 29 carried by the upper lever 26 which is engaged by all the lower levers 26. All parts are restored to their original positions by an arm 11<a>, Fig. 6, on the main shaft 11 engaging one arm of a bellcrank lever 46 connected to a slide 44 guided by pins 45 and a roller 52. In its forward movement, it strikes a roller 43 on a slide 42 connected by a pin and slot to an arm 32a, Fig. 10, of the bracket 32, thereby returning it and the slide 17 to their original positions. The slide 44 is released from engagement with the roller 43 by an inclined face 49 striking a fixed pin 50. A projection 51 on the slide 17 restores all the extruded stops 12 during its return movement. Repeat key The slide 44 is depressed against its spring 47 by the roller 52, which is carried on a repeat key 54, so as to prevent its engagement with the roller 43. Depression of keys during an operation of the main shaft is prevented by a lever 63, Fig. 4, which is lowered into the path of a projection 65 on the top lever 26 by the movement of the operating-handle. A glazed sight-opening 67 may be provided in the casing together with a scale to show the number of digits set up. Error keys. The depression of an error key 56 causes a pawl 58 thereon to engage ratchet teeth 59 on the bar 42 and force it forward sufficiently to restore the slide 17 one step, a projection 61 on the pawl serving to prevent overthrow.