Patent GB-191409376-A (GB)
Title: Improvements in Printing Telegraph Systems.
IPC: H04L17/24
Filed: 1914-04-15
Granted: 1914-12-24
Abstract: 9376. Western Electric Co., [Woodward, F. T., (acting for Western Electric Co.)]. April 15. Electric type-wheel actions. - Each letter is selected by a combination of five positive and negative impulses, the positive impulses serving to rotate certain of a set of five slotted selecting-disks. When the combination of impulses for a letter has been received, a pivoted bar falls into an alined row of slots in the disks, and is able to hold a rotating type-wheel in a position to print the selected letter. The Figures show the receiving-apparatus, which is operated over the live wire L. The polarized relay 1 closes the contact 4 when a positive impulse is received, thus connecting the battery 3 over the distributor ring 5 to the segments 11 ... 15. Impulses over these segments energize the relays 21 ... 25 and the operating-magnets 31 ... 35. An impulse is also sent over the ring 8 and contact 10 to the relay 26 and starting-magnets 78, 79. A holding-on circuit for all the energized magnets can be traced from ground over magnets 35, 34, 78, 33, 32, 79, 31 to battery 81, and for the energized relays from ground over relays 21 ... 26 to battery 81. The magnets 31 ... 35 actuate disks 51 ... 55 to bring a series of slots in the disks into line. When the impulse from the distributor contact 10 energizes the relay. 26 and the starting-magnets 78, 79, the armatures 72, 73 are raised and allow the selected lever 65 to rise into the path of the arm 66 on the typewheel shaft. The relay 26 closes a circuit over its armature, the armature of a start-control relay 92, lead 93, starting-magnet 94 and lead 95 to battery 81. The magnet 94 releases the type-wheel, which is rotated by the motor 48 until the arm 66 is held by the raised lever 65, whereupon a circuit is closed from ground 103 over lever 65, arm 66, printing-magnet 105, lead 106, space-lock relay 107, relay 80 to battery 81. Case-shift mechanism.-To obtain a vertical movement of the type-wheel, a combination of two positive, one negative, and two positive impulses is sent, thus energizing the relays 21, 22, 24, 25 and the magnets 31, 32, 34, 35. A circuit is now completed from the battery 160 over the front contacts of the relays 21, 22, back contact of relay 23, relay 172, front contacts of relays 24, 25 and relay 92. The relay 92 prevents the release of the type-wheel, and the relay 172 closes a circuit from battery 81 through relay 80, resistance 165, lead 174, contact of relay 172, relay 176, armature of relay 177, lead 178, and armature of relay 133. The relay 176 closes a circuit through shift magnet 170, relay 176, lead 178 to armature of relay 133, and this circuit remains closed after the relay 80 has opened the selecting circuits. The shift magnet raises the type-wheel through the roller 186. To de-energize the magnet 170, five positive impulses are sent over the line, energizing the relays 21 ... 25. A circuit is completed from battery 160 over the front contacts of relays 21, 22, 23, lead 187, relay 177, lead 173, front contacts of relays 24 and 25, and relay 92. The relay 177 opens the circuit of the magnet 170 and relay 176. The circuit of the relay 176 is also opened when the relay 133 is energized, as described below, to return the paper carriage to initial position. Hammer - impression arrangements. - The printing-magnet 105 moves the platen 111 against the type-wheel, and the relay 80 breaks the holding-on circuits of the selecting relays and magnets and the circuit of the starting- magnet 94. The relay 80 also closes a circuit for the retractor relay 153, which closes a circuit for the retractor magnet 155. This magnet rotates the type-wheel shaft a short distance in a direction opposite to its normal one, thus breaking the circuit through the printing- magnet 105, and the clearing-out relay 80. Letter-spacing mechanism. - When the spacelock relay 107 is energized, as described above, it completes a locking circuit for itself over the space magnet 131. lead 132, and armature of relay 133 to ground. The armature of the magnet 131 causes the pawl 136 to move the ratchet-wheel 137 forward, thus moving the paper-carriage 140 through the cord 139. The armature of the magnet 131 also short-circuits the holding winding of the relay 107 at the contacts 151. In order to move the carriage forward a space without printing a letter, a combination of two negative, one positive, and two negative impulses, is sent, thus energizing the relay 23 and magnet 33. The relay 33 completes a circuit from battery 160 over the back contacts of relays 21, 22, front contact of relay 23, space relay 157, back contacts of relays 24, 25, and start-control relay 92. The relay 92 opens the circuit of the magnet 94 before the type-wheel is released, and the relay 157 closes a circuit from armature of relay 33, over contact of relay 157, to relays 107 and 80. The relay 107 causes the operation of the space magnet 131 as described above, and the relay 80 opens the selecting circuits. Carriage - returning mechanism. - When a series of impulses is sent to energize the relay 24 only, a circuit is made over the carriagereturn relay 133, carriage-return lock relay 191, and start-control relay 92. The relay 133 completes a circuit over the resistance 165 and clearing-out relay 80, and the relay 191 completes a circuit over its holding winding, lead 195, and magnet 196. The magnet 196 moves the holding-pawl 199 from the ratchet 137, and the spring 143 then moves the paper-carriage back to its initial position. When the ratchet 137 returns, the pin 201 closes the contacts 202 to short-circuit the relay 19. Line-spacing mechanism.-When the line-feed relay 210 is energized by its combination of impulses, a circuit is closed over the conductor 211 and the magnet 212. The magnet 212 rotates the paper-carriage through the ratchet 216 and, by closing the contacts 218, shortcircuits itself and energizes the clearing-out relay 80.