Patent GB-789742-A (GB)
Title: Improvements in or relating to type-printing telegraph apparatus
IPC: B41J2/27
Filed: 1954-12-23
Abstract: 789,742. Typewriters &c. HANDLEY, J. Dec. 16, 1955 [Dec. 23, 1954], No. 37130/54. Class 100(4) [Also in Group XL(b)] In a printing-telegraph receiver the character is reproduced.by a number of impression-forming sections which are selectively set up for the printing operation by the movement in its own plane of a character-determining plate selected in response to the received signals. The character is reproduced by the selective downward operation of a number of punches 1 with arms 3 engaged by selector bars 4 sliding in a guide block 5 and actuated by movement of selector plates 7 corresponding to the total number of characters and symbols and slidable in grooves 8 in a block. Each plate 7 has twenty five apertures 6 and the bars 4 corresponding to a character have apertures 13 engaged by inclined tongues 12 in the appropriate apertures 6, so that rightward movement of the plate 7 depresses the bars 4 and associated punches 1 forming the character. Each plate 7 is connected to a tongue member 20 having a tapered end normally supported opposite gaps 16 in an actuating member 14 operated by a magnet 18. A relay 22 operated by the signal of the character to be printed rocks a shaft 43 so that a finger 21 raises the tongue extension to a position opposite a toothed portion 15 of the member 14 with the result that energization of the magnet 18 moves the selected plate 7 to the right. In the arrangement described four operating magnets 18 are employed. Printing and spacing operation. A magnet 28 operated simultaneously with the operating magnet 18 effects the temporary connection of an operating ring 35 to a shaft 32 driven by a motor 31. A radial arm 37 connected to the ring 35 carrying a platen member 38 which is rocked downwardly in Fig. 7 so that the printing tape 39 and carbon paper are pressed against the ends of the array of punches defining the character. A spring 51 engaging a gear wheel 52 tends to rotate shaft 50 which carries a feed roller 47 and is permitted to rotate when a retaining pawl 54 is actuated by an extension of the arm 37 during its upward movement. A magnet 30 energized in response to the spacing signal operates an arm 58 which lifts the pawl 54 from the ratchet 55. The spacing rotations of shaft 50 drive through gears 60... 65 a gear wheel 66 on the shaft 59 of the spool carrying the inking ribbon. Circuit arrangements Figs. 8, 9. At the commencement of operation a switch 23 is closed and either L F relay - or - is op- 2 2 F erated. If, for example, relay - is oper- 2 is operated contacts f1, f2 are respectively closed and opened. Should the message commence with lower case characters, the reception of the " letters" shift signal oper- A A D E ates relays 1-, 2-...-, -so that the start 4 4 4 4 ulse applied at s is fed over contacts e1, d1, c1, 1b1, 1a1 and the winding of re- L L lay - to earth. Relay - operates and at 2 2 contact 12 opens the circuit by which relay F - could be operated and also its locking 2 circuit. If the signal is that for the letter V, the start pulse at s passes over the relay contacts to the conductor 26 and in parellel to the relays V and =, but the circuit of relay = is open at contact f1 and a circuit is completed over operated P contact l1, -and earthed battery 24. At 1 contact p1 the actuating magnets 18 are operated so that the selector plate 7 corresponding to the letter V is moved and clutch magnet 28 is operated to effectspacing of the tape before the character is printed. When the space signal is received, the start pulse at s is applied over the contacts a1, d2, 2b3, 4a2 (all released) and c4 (operated) to the conductor connected to the spacing magnet 30 which effects spacing of the paper without printing.