Patent GB-394371-A (GB)
Title: Improvements in apparatus for transmitting and recording signals
IPC: H04L19/00
Filed: 1931-11-25
Abstract: 394,371. Type-printing telegraphy. BURGESS, A. F., 10, New Court, Lincoln's Inn, London. - (Temporator Co. ; 540, Orleans Street, Chicago, U.S.A.) Nov. 25, 1931, No. 32695. [Class 40 (iii).] A printing-telegraph system in which the transmitted message is simultaneously recorded at the transmitting and receiving stations includes a timing and printing mechanism by which the date and time of transmission of the message aresimultaneously recorded at both, stations. Before commencing the messagetransmission the operator depresses a button D2 closing at two communicating stations X, Y, the circuits of magnets, R8, r8 which, through the actuation of a printing-platen R1, press a tape M against printing wheels P7, P10, P14, P18 corresponding to the time and date and which are driven by clock mechanism and set by hand respectively by gear wheels P20 .. P26 rotated from sleeves P21, P23 .. P27. With the button D2 still depressed a numeral or letter is transmitted from the dial X2, the opening and closing of the contacts X9, X10 energizing and de-energizing the magnets K3, k3 and withdrawing the printing hammer KIO from the tape. This is moved forward by the roller L5 carrying a ratchet L2 which is stepped by the pawl L. At the same time a pawl K15, mounted on the member K6, withdraws a retaining pawl K18 from the type wheel which is thereupon liberated to return to its normal position under the action of a spring G25. Before commencing the message-transmission the push-button D2 is released ; on rotation of the dial for transmission of a letter or numeral, contacts X6, X7 close, energizing magnets K3, k3, to step the tape at each station, to withdraw the printing hammer K10 and to free the type wheels to return to normal. The impulses corresponding to the character are transmitted from contacts X9, X10 and intermittently energize and de-energize magnets S2, s2 which through their armatures S8, s8 close circuits for stronger currents through the magnets J2, j2 effecting through armatures J5, j5 and pivoted pawls the stepping of the shafts carrying the type-wheels G14, G10 at each station. At the end of the impulse series, contacts X6, X7 open and relays K3, k3 deenergize, the hammer K10 effecting the printing on the tape M, the feed pawl riding over the ratchet L2, and a member K15 riding up over a pin K17 on the retaining pawl K18 for the type-wheel ratchet. The, letter or numeral being printed may be observed through a window G17 with which one of the two rows of type on the wheel G14 is aligned. To effect the printing of letters-i.e. letter shift-the switch-button F is depressed. This effects at stations X, Y the energization of relays 110, i10, the pivoted armatures of which are formed as forks T1 engaging collars I on the sleeves carrying the two type-wheels at the connected stations, which are moved longitudinally so that the letters are opposite the printing member K10 and opposite the observation window G17. The type-wheel shafts carry arms k4, H which are individually stepped over contacts alternately connected to positive and negative battery, and the corresponding contacts of the two series are connected to opposite poles of the battery. If in the transmission the type-wheel stepping-mechanisms fall out of unison, the circuit becomes dead, and dialling for that character has to be started again.