Patent GB-149859-A (GB)
Title: Improvements in and relating to a method of and apparatus for operating a printing telegraph
IPC: H04L5/22
Filed: 1919-10-06
Abstract: 149,859. Kleinschmidt, E. E. Oct. 6, 1919. Multiplex telegraphs; synchronous movements; type-printing telegraphs.-In a multiplex typeprinting telegraph system, each station comprises a distributor having transmitting and receiving segments, a clearing segment and a starting segment, and the contact-arm is arrested after it has passed over the transmitting segments and is released when a starting impulse is received from the distant station. Station apparatus. Each station comprises a perforated-strip transmitter C and selecting receiver magnets E, adapted to be alternately and successively connected to line 38 through a rotary distributor 8, a line relay 29, a starting-magnet 27, an initial starting switch 73, a strip-feed magnet 66 controlled by a cam-actuated switch 67, 68, and a switch 46, 47 controlled by a magnet 64 connected in series with the magnets E and a worm 61 on the distributor shaft 3 and controlling the circuit of a starting magnet 50 for the printer. The shaft 3 is driven from a motor 1 through a slipping clutch and is provided with an arm 4 adapted to be engaged by a bell-crank lever 74 the position of which is controlled by the magnet 27. The transmitting half of the-distributor consists of a semi-circular segment 42 connected to line 38 at a point beyond the relay 29 by a lead 43, five selecting-impulse segments 13 - - 17, a starting impulse segment 10 through which an impulse is sent to start the distant distributor 8<b>, and a segment 9 through which an impulse is sent to the distant relay 29<b> to cause its armature 30<b> to engage its right-hand contact. The receiving half of the distributor consists of a semi-circular segment 39 connected to line 38 through the windings of the relay 29 and adapted to be earthed through the brush 6, contact segment 40 and lead 41, a segment 28 connected to the left-hand contact of relay 29 and to the starting switch 73, a segment 26 connected to the starting magnet 27, and contact segments 33 - - 37 connected to the receiver magnets E. Operation. To start initially the apparatus at a station the switch 73 is closed to energize the magnet 27 from the battery 32 over segment 28, brush 7 and segment 26. The arm 4 is released and the brush-arm 5 is rotated until brush 7 engages segments 42 and 9, thereby sending a positive current to the distant relay 29<b> over resistance 24, contact 11, segment 9, brush 7, segment 42, lead 43 and line 38. The energization of relay 29<b> by a positive current causes its armature 30<b> to engage its right-hand contact. The continued rotation of brush 7 energizes the relav 29<b> with negative current from battery over resistance 25, contact 12, segment 10 &c. The relay 29b operates to energize the starting relay 27<b> from battery 32b over the segments 28<b>, 26<b> of the distributor 8<b>. The arm 4b is thereby released and the brush 7<b> passes over the segments 33<b> - - 37<b>, while the brush 7 passes over the segments 13 - - 17. When the brush 7 reaches the position shown, the shaft 3 is again arrested by the arm 4 engaging the lever 74, and these members are disengaged when the brush 7<b> engages segment 10<b>. The contact 47 of the switch 46, 47 is mounted upon a spring 48 the position of which is controlled by a spring 58 and an arm 52 pivoted upon a lever .54. When the station apparatus is receiving impulses to select the printing magnets E, the magnet 64 is energized to open the switch 46, 47 and upon the de-energization of the magnet 64 the worm 61 operates through the lug 60 and lever 52 to open the circuit of a starting magnet 50 for the printer.