Patent GB-112978-A (GB)
Title: Improvements in Means and Apparatus for Storing and Correcting Defective Telegraphic Signals Preparatory to Transmission.
IPC: H04L13/08
Filed: 1917-01-30
Abstract: 112,978. Eastern Telegraph Co., and Dunbar, J. H. Jan. 30, 1917. Automatic telegraphs; receiving and repeating systems and apparatus; synchronous movements. -In an automatic telegraph employing Wheatstone or cable code signals, the code pins are mounted in two constantly rotating disks and are set by magnets controlled bv a local key or by incoming signals. The armatures of the setting magnets actuate drivers which set the pins through 'intermediate mechanisms which are released from the drivers and restored to their normal positions after the pins have been set. The set pins, after transmitting the signals, are restored to their normal positions, and means are provided for synchronizing the speed of the code disks with the incoming signals. When the apparatus is employed to retransmit or record Wheatstone signals, the dot signals are interpolated by the apparatus, and when cable code signals are received as "block signals," they are broken up into their elements before retransmission or recording. Code pins, mounting and setting. The code pins 29, Figs. 1, 3, and 5. are slidably mounted in two disks a, b secured to @ sleeve c driven through gearing f, g and a variable-speed friction drive l, k from a pulley q. The pins 29 are set by spring-controlled bell-crank levers 61 having arms engaging slides 24. The slides 24 are operated by drivers 60 pivoted on links 53 connecting a centrally pivoted bar 50 and magnet armatures 54, 55. The bar 50 is provided with cranked ends carrying adjustable stops 74 against which the drivers 60 are pressed by springs 60. In their upper positions, the drivers 60 engage the slides 24, but after operating the slides to set the pins, they are disengaged from the slides by the stops 74 and the slides are then returned to their normal positions. Code pins, resetting. The inner face of each of the code disks a, b is provided with teeth 65. Fig. 5. each having a vertical face and an inclined face. The teeth are engaged by a spring-controlled lever 66 which slides over the inclined faces of the teeth and is forced into contact with the set bolts as it passes over the tops of the teeth. During resetting, the bolts are forced against an adjustable stop 74<1>. The pins of each disk may be reset by a stationary shoe or by a striker operated by a magnet. Synchronizing speed of code disks with incoming signals. The code disks a, b, Figs. 1. 3, and 5. are connected to wheels 4, having inclined teeth, bv spring-arms 7 slidably mounted on the disks. The wheels 4 are mounted on a shaft 23, passing through the sleeve c, one end of which is provided with a three-arm plate 8. Figs. 7 and 8. the outer edges of each arm of which are provided with teeth 16, 17. The plate 8 rotates between two toothed plates 13, 14 of a dutch-box, the plates being separated by an annulus 15. The plates 13, 14 and the annulus 15 are mounted between plates 11, 12 held together by bolts. The plate 12 is provided with a boss 9 through which the shaft 23 passes, and the plate 11 is provided with three slotted arms 25 terminating in flanges 19 engaging a groove 21 on a wheel 20. The wheel 20 is mounted on a sleeve v driven at the same speed as the sleeve c through gearing 1, 2. The sleeve y is internally screwed and engages a screwed rod r passing through it and terminating in arms 22 engaging the slotting arms 25 so that the sleeve y and rod r normally rotate at the same speed. The outer ends of the slides 24, operated by the incoming signals, are provided with inclined teeth adapted to engage the teeth of the wheels 4. When the incoming signals are in synchronism with the speed of the disks a, b, the teeth on the slides 24 engage the spaces between the teeth of the wheels 4, but if lack of synchronism occurs, the teeth on the slides engage the teeth of the wheels to give a longitudinal movement to the shaft 23. This movement causes the teeth on the plate 8 to engage the teeth on the plate 13 or 14 and the subsequent rotation of the wheel 4 produces a relative rotary movement between the sleeve y and rod r whereby the longitudinal position of the rod r is varied. The outer end of the rod r bears against one arm of a spring- controlled bell-crank lever v and its movement varies the position of the driving-disk of a frictiondrive l, k through a sleeve m upon which the disk l is mounted. The. longitudinal movement of the rod r may vary the speed of the motor driving the shaft h on which the pinions 2, g are mounted. Operation, setting up Wheatstone signals for transmission. When the apparatus is employed to store up Wheatstone signals for original transmission, the synchronizing device is omitted and the pins in the disk a are set for transmitting marking impulses and the pins in the disk bare set for transmitting spacing impulses. The pins in the disks a, b are in staggered relation and the spacing magnets 58, 59 and the mark. ing magnets 56, 57 are controlled by an ordinary hand transmitting key. Operation, setting up Wheatstone signals for retransmission. When the apparatus is employed to store up and retransmit Wheatstone signals, the dots are interpolated by the apparatus during the periods of no current due to the curbing effect of the spacing currents. To effect this dot interpolation, the magnets 56, 57. and 58, 59 are alternately energized when no current is arriving over the line L, Fig. 9, by the alternate operation of two contact arms 31, Figs. 1 and 9, by the passage of all the pins in the disks a, b under these arms. The arms 31 alternately energize the coils of a split relay 87 from a battery B through a resistance 99. The tongue 94 of the relay 87 alternately controls the circuits of relays 88, 89 which control alternately the spacing magnets 58, 59 and the marking magnets 56, 57 to set the successive pins of the disks a, b. When however a marking or spacing current arrives over the line L, a drum relay 84 controls the tongue 94 of the relay 87 through relays 85, 86 in such a manner that one half of the split relay 87 is energized directly from the battery B without the interposition of the resistance 99 so that the tongue 94 remains on its spacing or marking contact and the successive pins of the disks a, b are not set. In the modification shown in Fig. 10 the dots are interpolated by a contact arm 103 operated by cams 100 mounted upon a sleeve 101 frictionally mounted on a continuously driven shaft 102. The arm 103 is operated at the same rate as the storage pins 29 are set. When no current is arriving over the line L, the contact arm alternately closes the circuits of the split relay 87 which controls the magnets 56, 57 and 58, 59 in the manner described above. When signal currents arrive over the line L, a relay 108 is energized to open the circuit of the relay 107 which operates to open the circuit of a magnet 106. The de-energization of the magnet 106 allows a detent 104 to engage one of the projections 105 on the sleeve 101 whereby the contact arm 103 is brought to rest in its neutral position and the magnets 56, 57 and 58, 59 are controlled by the spacing or marking currents in the line L. Operation, transmitting and retransmitting Wheatstone signals. The set pins of the disks a, b operate bell-crank levers 46 to rock a pivoted T piece 41 upon which is pivoted an insulated contact piece 45 adapted to bridge contacts 46, 47 and contacts 48, 49. The contact piece is retained in either of its operative positions by providing the outer end of the T piece 41 with a knife-edge 71 which engages a spring-mounted knife-edge 70. The pins in the disk a operate the contact-piece 45 to transmit or retransmit marking currents and the pins in the disk b operate the contact-piece 45 to transmit or retransmit spacing currents. Operation, retransmitting cable code signals and breaking up block signals. When the apparatus is employed to retransmit cable code signals, the pins in the disks a, b are placed in alinement and each of the pin-setting magnets 56, 57, 58, 59 is arranged to be energized separately, while the lever 50, Fig. 1, is replaced by two levers 111, 112, Fig. 11. The dot-setting magnets 56, 57 are controlled by a contact arm 113 which is vibrated between the contacts 114, 115; while the dash-setting magnets 58, 59 are controlled by a contact arm 118 which is vibrated between the contacts 119, 120. The contact rims 113, 118 are vibrated by cams 100 mounted on sleeves 101 frictionally mounted on a constantly rotating shaft 102. The cam sleeves are normally restrained from rotating by detents 104 controlled by magnets 123. 124. When a dot current is received over the line L, the drum relay 84 is operated to energize a relay 85 which controls the relay 88 of the magnet 123, thereby releasing the cam sleeve 101 of the arm 113 to energize alternately the magnets 56, 57 to set the dot pins. Similarly, when a dash current is received, the cam sleeve 101 of the arm 119 is released to energize alternately the magnets 58, 59 to set the dash pins. The bolts 29, Figs. 1 and 3, operate a known form of transmitter. Operation of perforator or recorder. When the bolts 29, Figs. 1 and 3, are required to operate a perforator or recorder, additional bell-crank levers are provided which control contact devices in the operating circuits of the perforator or recorder.