Patent GB-696541-A (GB)
Title: Printing telegraph apparatus and circuits therefor
IPC: H01H67/26
Filed: 1948-04-05
Abstract: 696,541. Printing-telegraph systems and apparatus. TELETYPE CORPORATION. April 5, 1948 [April 7, 1947; May 31, 1947; Nov. 15, 1947], Nos. 9469/48, 9470/48 and 9471/48. Class 40 (iii). A control apparatus comprises selecting means responsive to received permutation code combinations of signalling pulses, a series of permutation members controlled by said selecting means, elements selectable by said series of members, means for controlling the effectiveness of said elements for actuation upon selection by said series of members, and means for conditioning said controlling means to permit actuation of said elements in a predetermined sequence whereby an element terminating a predetermined sequence is actuated to effect a controlling action by code combinations of signals received in the correct sequence. Code-controlled apparatus. The received signal impulses operate a magnet 14 having an armature 15 of the " assisted " operation type which has an extension carrying a member 43 with lateral extensions 44 co-operating with the arms 46, 47 of sword members 19 pivoted on bell-cranks 24 oscillated by projections 36 of a cam member carried on a sleeve 28. The sword member 19 is selectively positioned by the member 43, and when moved to the right, rocks, if necessary, a pivoted lever 48 engaging the end of a selector bar 51. Five selector bars 51 are individually associated with one of five vanes 55 ... 59 mounted in V-shaped notches in a bar 68, Fig. 8, and biased by over-centring springs 69. The extreme positions of the vanes are defined by projections or stops on a fixed plate 75. The selective settings of the vanes 55 ... 59 partly control the actuation of pivoted selector bars 76 to which are attached by elongated slots 84 code elements 83 having on their bottom surfaces wards and notches corresponding to the character or functional signal which they represent. The actuation of the bars 76 is also controlled by blocking levers 147 which are moved out of blocking position with regard to the bars 76 is the signals are received in the correct sequence corresponding to the selection of a subsidiary station or transmitter. The blocking lever 147 corresponding to the first signal pertaining to a station is rocked to the unblocking position by the manual insertion of a gate member and after the reception of the first signal, a bail 88 controlled by an eccentric 101 on the shaft 29 allows the selector bars 76 to fall to sense the setting of the vanes. If the signal is the first of the sequence, the bar, being unblocked, falls to allow a shoulder 119 on its extension 118 to be engaged by a hook member 122 so that the subsequent upward movement of the bail 88 and bar 76 rocks a lever 124 having a sloping cam surface 153 engaging a stud 152 of the blocking lever 147 associated with the selector bar 76 corresponding to the next signal in the predetermined signal sequence, so that the lever 147 is rocked out of blocking position. Each bar 124 carries a hook 144 which latches with a projection 143 on a pivoted latch member 136. An operated bar 124 is released after the reception of the subsequent signal by a bail 107 operated by an eccentric 102 and carrying a blade 112 which normally engages with a projection 169 on the latch 136. In some cases an extension 118 on a code bar 76, when operated, engages a U-shaped member 117 so that the blade 112 engages lower shoulders 167 on a pair of latches 116 and effects release of the previously operated latch 136 by engaging a lower projection 142. In some instances, particularly for the control apparatus at a central station associated with a number of subsidiary stations, the bar 124 and blocking lever 147 operated by a signal are restored by the operation of the subsequent latch member 136 having a projection 145 which engages with a cam slope 154 on the previously operated lever 124. The caseshift signals " figures " and " letters " control the position of a sixth vane 60 which takes one or the other of two positions in a notch of the bar 75 under control of pivoted members 206, 207, Fig. 11, having lateral extensions 209, 211, engaged by abutments 214, 215 of members 212, 213. The actuation of the lever 124 corresponding to the shift signal rocks the vane 60 to its opposite position, if it is in the unshift position and vice versa, and its position in conjunction with the wards and notches determines the preliminary selection of the selector bar 76. Testing arrangement, Fig. 8. The functioning of the apparatus is tested by the examination of its response to the transmission of characters R, Y. For this purpose the blocking levers 147 associated with the bars 76 corresponding to R, Y are connected by a bridge 177. To prepare the apparatus for the test an indicating plate 185 is rotated to the position shown and a lever 183 rocked so that a cam portion 199 rocks the blocking levers 147 clear of the ends of the bars 76. Extensions 198 on the bars 76 engage the U-shaped member 117 and rock the latches 116 so that the blade 112 assumes its lower position and is unable to operate a control member 196. If a signal other than R or Y is received, the blade 112 in its rightward movement actuates the lever 183 so that the lever 182 rotates slightly and a red portion on the plate 185 appears opposite an observation aperture 191. In addition, the movement of lever 183 actuated the contact 204 of a signal alarm. An alternative testing arrangement, Fig. 15 (not shown), comprises a slow-release relay connected in parallel to the contacts closed by the operation of the selector bars allocated to the letters R, Y. If neither of the two characters is received during a signal period, the relay releases and closes the circuit of a visual and/or audible alarm. Circuit arrangements at main station, Figs. 16 to 19. The normally closed line circuit extends over conductors 251, 265, line relay 264, contact 261 of relay 262 and stop contacts 255, 252 of transmitters 256, 253, respectively. The operating circuit for the magnet 14, of the selector 300 and the main station printer 525 extends from the marking contact 267 of relay 264 over contact 274 of relay 262. Relay 275 is initially not energized and controls a lamp 277 and a buzzer 278 over a switch 270. To initiate operation, key 281 is operated, and relay 275 energizes, locks up and extinguishes lamp 277. Operation of the sequence start key 295 operates relay 262 which at contact 261 opens the line circuit and armature 266 moving to its spacing contact 307 energizes relay 288, but relay 275 remains energized over an alternative circuit. Relay 288 operates relay 309 and also a relay 373 associated with a counting chain relay 394 which locks up over a contact of an associated relay 378. Key 295 is operated temporarily and when released opens the circuit of relay 262 which has a release time of three tenths of a second. Relay 288 is slowto-release and relay 275 remains energized over a circuit from marking contact 267 and its contact 291. When relay 288 de-energizes, it energizes relay 334 which closes a circuit for a relay 305 which operates when relay 262 deenergizes at the end of three-tenths of a second, and which locks up over contact 528 of the unit 300. A circuit is now completed for the control magnet 356 of the unit 253. A fixed set of signals is transmitted from the transmitter 253 and the space signal opens the normally closed contact 363, and closes the normally open contact 365 to energize the magnet 371 of the auxiliary transmitting unit 256 which transmits a group of signals comprising the date, time of transmission and other particulars. With the counting chain relay 394 operated the first code combination is transmitted over the contacts 417, the appropriate code combination being set up on the contact banks engaged by the arms 451 ... 455. The opening of contact 372 of the transmitter 256 de-energizes relay 373 and energizes relay 378 which effects the operation of relay 395 and de-energization of relay 394 so that the second code group is transmitted from switch 438 over contacts 437. The seventh code signal of the date-time group is the " letters " signal transmitted by the contacts of relay 400. The subsequent signal set up on the switch 460 and transmitted over the contacts of the relay 401 is the time zone of the date-time group. The final signal is " carriage-return " which opens contact 365 and interrupts the circuit of the magnet 371 of the transmitting unit 256 which, however, completes a final cycle during which the line-feed signal is transmitted. This signal closes contact 363 to re-establish the circuit of the magnet 356 of the transmitter 253 which now transmits the conditioning and selecting codes to bring in the desired subsidiary station. This code is followed by a space signal which opens contact 343, de-energizing relay 334 which at contact 358 opens the circuit of the start magnet of the transmitter 253, and a " letters " signal transmitted during the final cycle of the transmitter opens contact 322 which breaks the circuit of relay 309. Relays 375, 288 and 305 at the main station remain energized. The message transmission from a subsidiary station is terminated by a code group of signals which restore the station to normal and which, at the main station, effect the closing of contact 536 which energizes the start magnet 536 of the transmitter 253 to transmit the conditioning and selecting code signals of the next subsidiary station to be called in. If the called subsidiary station fails to answer or does not send the end-of-message group of signals, the armature of the line relay 264 remains on " marking " for a considerable period. Relay 288 will deenergize and prepare a circuit for a relay 569 which operates at the end of 3 seconds and at contact 574 completes a circuit for the relay 334 which at contact 410 completes a circuit for relay 440 controlling the transm