Telegraphically controlled timing mechanism

674,245. Telegraph exchange systems. TELETYPE CORPORATION. Aug. 5, 1949 [Aug. 13, 1948], No. 20424/49. Class 40 (iii). In an electrical telegraph system comprising a central station connected over a two-way signal transmission path to a plurality of remote stations, each provided with means to initi...

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Hauptverfasser: SIM GORDON, KEYES GEORGE G
Format: Patent
Sprache:eng
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Zusammenfassung:674,245. Telegraph exchange systems. TELETYPE CORPORATION. Aug. 5, 1949 [Aug. 13, 1948], No. 20424/49. Class 40 (iii). In an electrical telegraph system comprising a central station connected over a two-way signal transmission path to a plurality of remote stations, each provided with means to initiate transmission of signals from its local transmitter to the central station in response to the reception of a predetermined sequence of signals transmitted from the central station, the predetermined sequence includes a measured pause of predetermined duration during which code signals are not transmitted. The arrangement (Fig. 4), responsive to the station selecting sequence of signals is mainly similar to that described in the Specification 696,541, but also includes means for controlling the timing arrangement and for closing the contacts 36 to complete the circuit of the station transmitter. The elements of a received signal selectively set vanes 41 and selector levers 43 are provided with attached bars 45 having code projections corresponding to the sequential signals for selecting the station. When the levers 43 are lowered at the end of each signal by a bail 47, the selected lever 43 drops so that a shoulder 56 is engaged by a hook 57 which, on the upward movement of the bail 47, raises a lever 58 which is latched by a member 64. The bars 45 are associated with blocking levers 67 and a cam surface 74 on an operated lever 58 engages a lateral stud 71 on the blocking lever 67 associated with the next bar 45 to be operated in the station-selecting sequence. A gate member 72 is manually operated to rock the blocking lever 67 associated with the first code bar 45. The station selecting sequence is constituted by the signals for Blank, Space, a letter, such as A, B, ... designating the station and' the " Letters " signal. The bar 58 operated by the " blank " signal has an extension 61 with a projection 95 which operates a rod 91 and the bar 58 operated by the station-designating letter allows contacts 36 to close for the operation of the tape or like transmitter at the outlying station. The operation of the rod 91 rocks a member 85, Fig. 2, to remove a tooth from engagement with a cam 77 on a sleeve 76 which is released for one revolution and driven at a relatively slow speed from the receiving selector cam-shaft. If signals are not received during the predetermined interval, e.g. one second, which follows the blank signal and is represented by the distance b