Patent GB-190712342-A (GB)
Title: Improvements in and relating to Printing Telegraph Receivers.
Inventor: BURRY JOHN
Filed: 1907-05-28
Granted: 1908-08-28
Abstract: 12,342. Burry, J. May 28. Telegraphs.-Type-printing telegraph receivers, particularly adapted for army and navy use, are constructed so as not to be affected by the firing of guns or by other rough usage. The types are arranged upon a flat plate adapted to be moved laterally and longitudinally so as to bring any desired character to the printing position. The impressions are made on the unexposed side of a transparent tape, which moves in a guide of a colour contrasting with the ink used, thus rendering the message easily legible. Step-by-step paperfeed and inking-ribbon mechanism are also described in detail. The typeplate 22, Fig. 1, is carried by the lever 7 adapted to be moved about two fulcra 12, 13 by the magnets 28, 29 to give lateral movement to the type-plate. The lever 7 is attached to a second lever 15 adapted to be moved about the two fulcra 20, 21 by the magnets 30,31 to give longitudinal movement to the type - plate. The fulcra 12, 13, 20, 21 consist of pins attached to the armature extensions of the respective magnets, and pass through slots 8, 9, 16, 17 in the levers 7, 15 respectively. When the magnet 28 or 29 only is energized, the lever 7 turns about the fulcrum 13 or 12, but when both the magnets are energized, the lever 7 moves bodily to the left. In the same way, by energizing one or both of the magnets 30, 31, the levers 15, 7 are moved up or down to the required extent. As the type-plate carries only sixteen types, arranged in four rows of four each, it is possible to bring any desired type to the impression point by energizing one or more of the magnets 28, 29, 30, 31. In order that each armature may serve as a steady fulcrum and not be affected when other magnets are energized, the armature extension 35, Fig. 2, is connected by a Jink 38 to the L-shaped lever 37, the short arm of which is connected to the spring 36. The pull on the armature is thus greatest at the beginning of its movement, and least at the end. The magnet pole-pieces may partly embrace the armatures. The platen 23, Fig. 1, is pivoted at 24 and is connected by the rod 39 with the arm 41 adjustably secured to the armature 42 of the printing-magnet 43. The rod 39 is connected to the platen and to the arm 41 by ball-and-socket joints. In the paperfeed mechanism, the tape roll 46, Fig. 12, is carried by two pivoted arms 48, and is pressed by the spring 49 against a friction wheel 50, on the shaft of which is an escape-wheel 56 co-operating with the pallets 54, 55 on the platen 23. The tape passes to a receiving-reel 52, Fig. 1, on a shaft 58 which is rotated by a coiled spring 60 frictionally engaging the side of the ratchet-wheel 59, driven by the pawl 61 carried by the armature of the printing-magnet. A constant tension is thus kept on the tape, but a step-by-step feed is produced by the escape-wheel and platen pallets. The tape is guided over the wheel 50 by a shield 51, and after printing has been effected it is guided to the receiving reel by a trough 62, which may have a further depression 69, Fig. 13, slightly wider than the inked part of the tape, thus avoiding danger of smearing. The inking-ribbon 63, Fig. 1, is drawn from the spool 64 to the spool 65, one side of which is formed as a gear-wheel 67 meshing with teeth out in the shaft 58. To rewind.the ribbon, the spool 65 is raised by the bearing 66 against the tension of a spring normally keeping the wheel 67 in gear with the shaft 58. and the spool may then be rotated by hand. The five magnets 28, 29, 30, 31, 43 are preferably in independent circuits controlled by any suitable transmitting- apparatus.