Patent GB-362944-A (GB)
Title: Telegraph printing and like apparatus
IPC: H03M7/40
Filed: 1930-09-11
Abstract: 362,944. Printing-telegraphs. ALL AMERICA CABLES, Inc., 67, Broad Street, New York, U.S.A., and GRIFFITH, R. G., Telegraph Works, Croydon. Sept. 11, 1930, No. 27131. [Class 100 (iv).] Strip - controlled driving - mechanism. - In printing-telegraphs controlled by a tape having perforated code-signals consisting of different numbers of elements, the peckers close the contacts of selector-magnets, and means is provided for rendering inoperative the selectormagnets corresponding to elements extraneous to a signal. Shift may be effected by a signal, e.g. a five-element figure signal, containing more than a predetermined number of elements, re-shift being effected by a special signal or a word-space signal. Circuits for effecting line-feed, carriage-return, and stopping printing may be prepared by movement of the carriage and be closed by a word-space signal. In the apparatus shown in Fig. 2 peckers 1 .. 5 and 6 .. 10 for reading dots and dashes are released and retracted by means of a rocking arm 16 operated by a cam 12 on a shaft 13. The tape is fed differentially by means of a star-wheel 18 connected to a pinion 19 driven by a rack 20 co-operating with rocking stop-arms 28 .. 32 engaging the peckers. The rack is driven by means of a spring arm 24 operated by a cam 21, and is moved into and out of engagement with the pinion by means of a slide 27 connected to an arm 26 operated by a cam 25. When the peckers read a signal, the rack moves idly until arrested by the stop associated with the pair of peckers opposite the space following the signal, and when the peckers are retracted the rack engages and drives the pinion to impart a feed-movement equal to the length of the signal plus a space. The peckers close contacts 48 .. 52 and 53 .. 57, Fig. 1, in circuit with magnets 38 .. 42 and 43 .. 47, and to prevent energization of magnets extraneous to a signal, the stop-arms 28 .. 31 have overlapping extensions 60 .. 64 so arranged that the stop-arm associated with the peckers opposite the space co-operates with succeeding stop-arms to prevent the extraneous peckers from rising. In another arrangement for preventing energization of magnets extraneous to a signal, the contacts 48 .. 57 are in circuit with other contacts closed by the stoparms and so arranged that the peckers opposite the space disconnect the contacts associated with succeeding peckers. When the peckers read a figure signal containing five elements, a projection 69 on the rack 20 closes a contact 70 and a shiftmagnet 71 is energized. The parts remain in shifted position until a special signal or a word-space signal effects energization of a re-shift magnet 73. The special signal closes a contact 72 in circuit with the magnet 73, and when the word-space signal occurs, a contact 74 is closed and a magnet 75 and the magnet 73 are energized. When a long series of figures occurs they are represented by short signals. A printing and letter-spacing magnet 76 is in circuit with a contact 77 closed by a cam 78. After the carriage 79 has travelled a predetermined distance, a cam 80 thereon closes a contact 81 and when a word-space signal occurs the contact 74 is closed. Thereupon, a two-way relay 84 establishes the circuits of carriage-return and linefeed magnets 87, 88, and of a magnet 85 arranged to stop tape-feed and printing by depressing the slide 27 and breaking a contact 86. When the carriage has been returned, a finger on the cam 80 closes a contact 89, and another two-way relay 90 causes the relay 84 to de-energize the magnet 85 and re-start tape-feed and printing. The carriagereturn and line-feed signal closes a contact 92 in circuit with the magnets 87, 88 and relay 84. At the end of a message a signal closes a contact 91 in circuit with the relays, and the magnets 85, 87, 88 are energized to stop printing and effect carriagereturn and line-feed. A fresh blank is then inserted, and a key 92<1> is depressed to re-start printing, a contact closed by the key being in circuit with the relay 90.