Patent GB-191503987-A (GB)
Title: Improvement in Printing Telegraph Receivers.
IPC: H04L5/22
Filed: 1915-03-19
Abstract: 3987. Western Electric Co., [Assignees of Dixon, A. F.]. March 19, 1914, [Convention date]. Type-printing telegraphs.-A receiver, of the kind in which one set of impulses is being printed while the succeeding set is being received, is provided with a single set of receiving-relays equal in number to the maximum number of impulses receivable. In the arrangement shown, the positive impulses received over the line L connect the battery 3 to the segment 5 of a rotary distributor 10 by means of a polarized relay 1. A rotary arm 11 carrying a brush 12 is adapted to connect the segment 5 to the contacts 15 .. 19 of the selecting- relays 25 .. 29, which close selectively the circuits of the operating-magnets 45 .. 49 over the upper armatures of the relays, lead 101, back contact of relay 52, and armature 53 and also close the holding- circuits of the relays over lower relay armatures, lead 90, relay 51, lead 91, and contacts 92, 93. The energized magnets of the set 45 .. 49 operate, through levers 71, their respective disks 65 .. 69 rotatably mounted and provided with notches. Around the disks 65 .. 69, a number of spring- controlled pivoted levers 75 are mounted in such a manner that, when their horizontal projections are released by the levers 85, one of the levers 75 engages an alined set of notches in the disks 65 .. 69, thereby allowing the horizontal portion of this lever to rise and come into the path of an arm 76 on the type shaft 56. After the brush 12 has engaged the contacts 15 .. 19, it bridges two contacts 20, 22, thereby energizing a release relay 110 from a battery 21, over lead 50, contact 51<a> of energized relay 51, lead 111, and contact 115<a> of a "clear-out" relay 115. The energization of the relav 110 closes the circuits of the release magnets 86 of the spring-controlled levers 85 over leads 117, 116, contact and winding of relay 110, lead 111, and contact 115<a>. The closure of this circuit holds the armature of the relay 110 in its attracted position, while the energization of the magnets 86 allows one of the levers 75 to engage an alined set of disk notches. The operation of the left-hand lever 85 also opens the holding-circuit of the relays 2@ .. 29, and that of the "release-control" relay 51 at the contacts 92, 93, and closes the circuit of the "overlap" relay 52 over the lead 131 and contacts 125, 93, thereby attracting the armature 53 to break the circuit of the energized magnets 45 .. 49 at the back contact of the relay 52 and to establish a new earth for the relays 25 .. 29 and relay 51 over the front contact of this relay. The de-energization of the previously energized magnets 45 .. 49 does not allow the armatures of the magnets to move, since they are held in their operated positions by the lever 75 engaging the notches of the operated disks. The operation of the lever 85 also closes the circuit of the " startco trol " relay 133 over the lead 132 and contacts 126, 127, while the energizasi on of this relay closes the circuit of the starting-magnet 135 from the battery 145 over contacts 142, 143, lead 141, armature and contact of relay 133, leads 140, 112, and contact 115<a>. The energizat on of the magnet 135 withdraws a stop (not shown) from the type shaft 56 and allows this to rotate until the arm 76 engages the raised portion of the operated lever 75, whereupon the motion of the type shaft is arrested so that the type-wheel is in a position for printing; while the clear-out magnet 115 is energized from the battery 150 over leads 151, 152, operating- winding of "space-lock" relay 153, printing-magnet 155, and contacts on arm 76 and lever 75. The operation of the space-lock relay 153 closes the circuit of a holding-winding for this relay and the circuit of the "spacer" magnet 156, which, in addition to feeding the paper, opens the circuit of the holding-winding of the relay 153. The energization of the clear-out magnet 115 opens the circuits of the starting-magnet 135, release relay 110, and release magnets 86 at the contact 115<a>, whereby all the levers 75 are moved from the disks 65 .. 69 ; and the circuits of the space-lock relay 153 and clear-out magnet 115 are broken at the contacts on the arm 76 and lever 75. The de-energization of the release magnets 86 breaks the circuit of the start-control relay 133 at the contacts 126, 127, and the separation of the contacts 125, 93 opens the circuit of the overlap relay 52, while the closure of the contacts 92, 93 again cumpletes the circuit of the selecting-relays 25 .. 29 and relay 51. The de-energization of the overlap relay 52 again closes the circuit of the selected operating-magnets 45 .. 49 at its back contact. The type-wheel is provided with two rows of type, and the case shifted by a magnet 165, while the line-feed and carriage-return are controlled by magnets 162, 173 respectively.