Patent GB-441090-A (GB)
Title: Improvements in or relating to translating mechanism for printing, telegraph printing, recording, registering and like apparatus
IPC: B41J7/60
Filed: 1934-07-19
Abstract: 441,090. Type-printing telegraphy. GRIFFITH, R. G., Montclair, Crewes Avenue, Upper Warlingham, Surrey. July 19, 1934, Nos. 21124/34 and 3547/35. [Class 40 (iii)] [See also Group XVI] A type wheel is positioned or a type bar is selected by the combined action of two groups of aggregate-motion devices whose movement is derived from a common driving motor. Setting of type wheel ; printing-stroke. The type wheel 1, Fig. 2, is turned by means of spiral gearing 43 and a pinion 8 which is actuated by a rack 9 controlled by the first group of three permutation bars 19a, 19b, 19c. The type wheel is moved axially by means of a rack-and-pinion 51, 49 and a pinion 3 which is actuated by a rack 4 controlled by a second group comprising the last two permutation bars 19d, 19e and the bar 31, which latter is controlled by the shift signal. The type wheel 1 is caused to print against the platen 42 when the frame 54 as a whole is tilted by cam action about the axle 55, and at this time the star-wheel 47 registers with a rack 93, Fig. 6, for the purpose of rendering the position of the type-wheel definite. The rotary movement of the frame 54, Fig. 2, causes the pinions 3, 8 to roll slightly, but this effect is taken up by the backlash of the mechanism ; alternatively, however, it may be avoided by making the pinions 3, 8 coaxial with the axle 55 and letting them drive the gearing 49, 43 through sun-and-planet gearing (Fig. 5, not shown). During the return move. ment of the frame 54 letterspacing is effected by engagement of the fixed bar 57 with the pin 56, which acts through ratchet- and-pawl 59, 58 and rack-andpinion 61, 60 to shift the typewheel carriage 50 along the square shafts 44, 48. Selector mechanism for type wheel. The type wheel 1 is set by two racks 9, 4, one 9 of which is set by the permutation bars 19a, 19b, 19c, while the other, 4, is set by permutation bars 19d, 19e and case-shift bar 31. The movement of the rack 9 aggregates the movements of points a, b, c on levers 11, 12, and the bar 4 is analogously actuated. The position of point a is determined through linkwork 10, 28a, 21 by a cam 13 which is released for half a revolution by a fork 18 at each movement of the permutation bar. The point b on lever 11 is similarly positioned through linkwork 29, 28b, by cam 14 controlled by permutation bar 19b. The point c on lever 12 is similarly positioned through linkwork 30, 28c, by cam 15 controlled by permutation bar 19c. The levers 11, 12 are so connected that the movement communicated to the rack 9 aggregates the above movements, and the points a, b, c divide the levers 11, 12 in suitable ratios (set out in the Specification) for enabling the rack 9 to occupy eight different positions. Ink-ribbon, lifting. When the frame 54, Figs. 2, 6, is tilted anticlockwise about the axle 55 for the printing-stroke, an adjustably mounted pin 112, Fig. 6, working in a slot 109a, tilts two ribbon-carrying arms 110 clockwise about an axis 111 and so brings the ribbon 96 between the type wheel 1 and platen 42. When the frame 54 has returned after printing, the ribbon is moved downwards so that the print may be visible. Ink-ribbon feed. During the printing-stroke two rods 108a, 108b, Figs. 6 and 7, turn the three-armed levers 100a, 100b associated with the two ribbon spools 94a (shown as unwinding) and 94b (shown as winding up), the latter of which is stepped forward by a pawl 103b and held by a holding-pawl 104b. The ribbon feed is reversed when the ribbon actuates a lever 116a so as to push down a dog 106a which, on the next actuation of the feed lever 100a, shifts the rod 114 longitudinally so as to press the tails of the pawls 103b, 104b, putting these pawls out of action ; at the same time the pawls 103a, 104a are brought into the operative position. Type-bar-selecting mechanism. In a modification using type-bars, the aggregated motions of the levers 6, 7 and 11, 12, Fig. 2, controlled by the permutation bars 19a ... 19e and case-shift bar 31, are applied to bars 68, 69, Fig. 8, instead of to racks 4, 9. The bar 68 has four positions, in each of which one of the notches 77 admits a corresponding lever 70 when a cam 76 permits this to be pulled forward by a spring 75. The lever 77 thus selected drives in the corresponding one of the four push-pins 79, and this push-pin has been positioned by the 8-position bar 69 in front of one of the hooks 81. The hook 81, when drawn down by the common bar 87, actuates a type-bar 84.