Patent GB-153825-A (GB)
Title: Improvements in printing telegraph systems
IPC: H04L25/42
Filed: 1920-02-28
Abstract: 153,825. Western Electric Co., (Western Electric Co.). Feb. 28, 1920. Type-printing telegraphs.-In a type-printing telegraph system of the kind in which the transmitter distributor and the receiving distributors are operated intermittently from continuously rotated shafts, means are provided to start the several receiving distributors at the initial movement of the transmitting distributor by a change in the electrical condition of the line created by the last signalling impulse. The line relays of the various stations are connected in series, and means are provided to close automatically the line circuit at the transmitter if the last signalling impulse of a message leaves the line circuit open. A line switch is provided at each station which, when opened, stops the transmitter and closes the circuit of a signal device at the transmitting station. The apparatus at each station comprises a transmitting distributor A, a receiving distributor B, and a set of signal storing relays 61 - - 65 adapted to be controlled by a keyboard 30 or a tape-transmitter 40. To signal by means of the keyboard 30, a switch 50 is moved to the position shown. When a key corresponding to the letter B is depressed, the contacts 31, 34, and 35 of the keyboard are closed to energize the relays 61, 64, and 65 from a battery 66 over a lead 31<a>, switch contact 57, armature 78 of a keyboard magnet 77, armature 79 of a lock-out magnet 76, overlap magnet 75, switch contact 59, and a universal contact 36 of the keyboard. The overlap magnet 75 locks up over its armature 80 and partially prepares a locking circuit for the lock-out magnet 76, which is completed when the magnet 76 attracts its armature 83. The relays 61 and 64 lock up over a circuit including the key-board magnet 77 and the armature 83 of the lock-out magnet 76; while the relay 65 locks up over a circuit including the armature 90 of a control relay 88, the armature 90 in its unoperated condition shunting the operating coil of a control magnet 87. The operation of the keyboard magnet 77 opens at its armature 78 the operating circuits of the selected relays 61, 64, and 65 and the overlap relay 75 in order that relays 61 to 65 and the relay 75 cannot be actuated again until the previous combination has been sent to line and the magnet 77 released. The operation of the armature 84 of relay 77 closes the circuit of the starting relay 10 of the distributor A as follows : battery ring 25, brush 26, segment 28, contact 60 of switch 50, armature 84, relay winding 10, armature 85 of lock-out control relay 86 and armature 83 of relay 76. The operation of relay 10 closes at its armature 12 the circuit of the start magnet 13 which operates to release the distributor arm 20. With the switch 29 in open position the line LL' is open when the distributor brush 27 rests upon the segment 5. When the brush 27 engages segment 6 the line LL<1> is closed to send a starting impulse to the various receiving stations from battery 95, armature 97 of control relay 87, segment 6, brush 27, ring 7, lead 21<1>, and line relay 100. The engagement of brush 27 with segment 1 closes the line circuit again over the armature 151 of the selected relay 61 and simultaneously the brush 26 engages the segment 8 to energize the control relay 88 and the lock-out control relay 86 from the batterv 11. The operation of relay 88 opens momentarily the shunt about the operating coil of the relay 87 at the armature 90, and the relay 87 operates to disconnect line L' from segment 6 and to connect line L<1> to segment 5 through armature 97, and to complete a holding circuit from battery 92 over armature 91 and armature 89 of relay 88 when the latter is de-energized. Since the relay 88 cannot be energized again until the arm 20 has made a complete revolution the line LL' is closed when the brush 27 engages segment 5 and open when it engages segment 6. The energization of relay 86 closes a locking circuit for this relay from battery 94 over its armature 85 and armature 83 of relay 76, and partially prepares an energizing circuit for the relay 76 which is completed when brush 26 engages segment 28. The line circuit remains open while brush 27 passes over segments 2 and 3 as the relays 62 and 63 are not energized, but when brush 27 engages segment 4 the line is closed over the armature 154 of relay 64. When the brush 27 engages segment 5 the line is again closed through armature 97 of relay 87, segment 5, brush 27, ring 7, and lead 21<1>. When the brush 27 has passed over the greater portion of segment 5 the brush 26 engages contact 28 to complete the energizing circuit of lock-out relay 76 which operates to break the holding circuits of the selected relays 61, 64, and 65, the energizing circuit of the key-board magnet 77, and the locking circuit of the relay 86, thus placing the sending apparatus in condition to impress upon the line a new combination of impulses. The lock-out magnet is not locked up unless the transmitter key is held depressed, in which case it prevents the repetition of the same current impulses. When the tape transmitter is employed the switch 50 is moved to its upper position and the switch 96 closed. The tape is fed by means of a magnet 46, which is energized from the battery 11 over ring 25, brush 26, segment 9, and contact 56 of switch 50 to set up a new combination of impulses while the previous set is being transmitted. The receiving apparatus at each station comprises a line relay 100, a leak-relay 116 controlled by the line relay, a start relay 110 controlled by the leakrelay, a rotary distributor B, and selecting magnets 141 - - 145. The relays 100, 116, and 110 are interconnected in such a manner that the distributor arm 120 is always released upon a change of condition of the line. In the open condition of the line as shown the relay 100 is deenergized. When the line is closed by the engagement of brush 27 and segment 6 of the transmitter distributor A the armature 112 is attracted to energize the winding 127 of the relay 116 from the battery 117. Before the leak relay 116 operates to break the contact 119, 121 the start relay. 110 is energized from battery 124 over ring 125, brush 126, segment 128, relay 110, contacts 119, 121, armature 112 to earth. The operation of the relay 110 energizes the starting magnet 132 over its armature 130 and establishes a holding circuit for itself over its armature 139 until the bush 126 leaves the segment 128. The closure of the line when the transmitter brush 27 engages contact segments 1, 4, and 5, causes the relay 100 to connect ring 138 to battery 146 through the armature 115 and the magnets 141, 144, and 145 are selectively energized. If the line circuit is closed when the brush 27 is upon the segment 5 the magnet 100 is energized and the contacts 118, 121 engage so that upon an opening of the line circuit when the brush 27 engages segment 6 the start relay 110 is energized over contacts 118, 121 of relay 116 and contacts 112, 113 of relay 100. In the modification shown in Fig. 2, a keyboard or automatic transmitter 12 is associated with a distributor A. When a key corresponding to the letter W is depressed contacts 15, 16, and 19 are established to energize the relays 20, 21, and 24 from a battery 13 over the armature 40 of the lock-out relay 25, armature 32 of keyboard relay 35, and the universal contact 14. The operated selecting relays lock up over a circuit containing the keyboard relay 35 and the armature 41 of the lock-out relay 25, and the energizing circuits of the selected relays are broken at the armature 32 of the relay 35. The armature 33 of the relay 35 completes the circuit of the sending start relay 26 from battery 27, ring 28, brush 29, segment 30, armature 33 of relay 35, armature 31 of break relay 34, and relay 26. The operation of the relay 26 completes a holding circuit for itself and an operating circuit for the start magnet 37, which circuits are broken after the distributor arm 10 has been released and the brush 29 leaves the segment 30. In the position shown the line circuit LL' is broken at the front contact of armature 46 of the relay 45. When, however, the brush 39 engages segment 52 the line circuit is completed over back contact of armature 46, segment 52, brush 39, ring 50, switch 125, and line relay 100. The operation of the line relays 100 at the various stations close circuits containing a grounded battery 127, segment 128, brush 129, segment 130, and starting magnet 137 of the receiving distributor B, armature 146 of relay 145 and front contact and armature 101 of the line. relay 100. When the relay 100 is de-energized or the brush 129 leaves segment 130 the magnet. 137 is de-energized to release its armature 138. The transmitter distributor arm 10 and the released receiving distributor arms 110 now rotate in synchronism to transmit impulses to line when the brush 39 engages contact segments 53 and 54, and to selectively energize the selecting magnets 120 and 121 from the battery 113 through contacts 153, 154, ring 150, and front contact and armature 101 of line relay 100. When the relay 24 is energized its armature 62 partially prepares a circuit for the operating winding of the start control relay 45, which circuit is completed from the battery 27 when the brush 29 engages segment 61. The operation of relay 45 connects line L<1> to segment 57 through armature 46 and its front contact so that relay 100 is energized to complete the circuit of the selecting magnet 124. The operation of relay 45 completes a locking circuit for itself over armature 68 of release relay 69, and this locking circuit is broken when brush 29 engages segment 78 to energize relay 69. When brush 39 leaves segment 56 the brush 29 engages segment 63 to energize the lock-out relay 25 which operates to open the locking circuits of the selected relays and to de-energize the key-board magnet 35. The engagement o