Patent GB-191502343-A (GB)
Title: Improvements in or relating to Telegraph or like Systems and Apparatus therefor.
IPC: H04L13/08
Filed: 1915-02-13
Abstract: 2343. Automatic Telephone Manufacturing Co., and Smith, S. R. Feb. 13 Type-printing telegraphs.-In a mechanical transmitter and storer of signals for multiplex working, the signals are stored by the displacement of pins, mounted on a rotating disk, by means of electromagnetically-operated hammers mounted on a carriage adapted to be clutched to and declutched from the disk shaft, while the selective energization of the setting-magnets causes firstly a relative movement between the pin disk and the hammer carriage, and secondly the operation of the hammers. The number of signals set up is limited by an electro-magnetic locking- arrangement which locks the keyboard against further operation until some of the set-up signals have been sent ; while the carriage is declutched from the disk shaft if the rate of setting up is slower than the rate of sending. In the arrangement shown in Figs. 1, 2, and 3 a shaft 5 mounted on standards 2, 3 carries disks 6, 7, the latter of which is geared to a phonic-wheel motor. The disks 6, 7 carry rows of pins 8, which in positions 8<a> are inoperative, but in positions 8<b> are adapted to force spring contacts 11 agaiost fixed contacts 10, thereby sending negative impulses to line by means of a double battery B, B<1>, Fig. 10, and an electro-magnet 51. Loosely mounted on the shaft 5 is a carriage comprising a tube 13 having end flanges 14, 15, through which rods carrying the hammers 16 loosely pass. Each pair of rods is provided with a flange 23 adapted to be engaged by extensions of the armatures of magnets 21, so that the energization of a magnet causes the operation of a hammer against the action of a spiral spring. The hammer carriage is adapted to be clutched to the shaft 5 through a slidable pawl 37 on the carriage and a ratchet-wheel 27 rotatably mounted on the shaft 5 and controlled by the rod 34, slidably mounted in one end of the shaft and connected to the pawl 31 by a link 33, the rod 34 being operated by a magnet 36. The flange 15 is geared on its edge and meshes with a gear-wheel 24 connected with a spring, which tends to turn the hammer carriage iu a clockwise direction, but is normally prevented from doing so by the engagement of a stop-pin 25 on the wheel 24 with the armature of a magnet 26. The wheel 24 carries a pair of brushes engaging a slip-ring 41 and a commutator 40, the segments of which are connected as shown in Fig. 10. The set-pins 8 are returned to their normal positions after engaging the spring contacts 11, by engaging inclined plates 12. The operation of the arrangement is as follows. When the starting-key is depressed, a spring contact 46, Fig 10, engages a contact 47, thereby energizing the starting-magnet 26, which withdraws its armature from the pin 25 on the wheel 24, Fig. 3, thereby allowing the wheel 24 to rotate the flange 15 until the pin 38 on the pawl 37 disengages its retaining-member 39 and the pawl 37 engages the ratchet-wheel 27. The operation of the starting-key also mechanically unlocks the remaining keys, which are locked by the magnet 48, Fig. 10. The hammer carriage then rotates with the shaft 5, and upon the operation of one or more of the character keys, one or more of the springs 42 are operated to engage the front contacts of their respective relays 43, thereby energizing the operating-coils of the relays, which operate to close hold-on circuits at the contacts 52 and contacts of an unlocking-magnet 53. The relays 43 close circuits at the contacts 57 and make circuits at the contacts 55, 56 before they break these circuits at the contacts 54, 55. The momentary make at the contacts 55, 56 energizes the magnet 36, Figs. 2, 10, which operates through its armature 35 and rod 34 the pawl 29, 30, Fig. 7, whereby relative movement between the hammer carriage and the disks 6, 7 occurs, and the hammers 16 come opposite another set of pins. The release of the character keys closes the circuits of the hammer magnets 21 of the selected relays 43 and of the unlocking-magnet 53, thereby operating the selected hammers and opening the circuits of the energized relays. When the signals are set up faster than they are transmitted, and a predetermined number of signals have been set up, the segment 19 of the commutator 40 is connected to the slip-ring 41, thereby energizing the magnet 48, which locks the character keys against further operation until some of the set-up signals have been sent, whereupon the keyboard may be unlocked by depressing the starting-key. When the signals are set up slower than they are transmitted, the commutator segment 20 is connected to the slip-ring 41, thereby energizing the magnets 49, 48, the former magnet operating to withdraw the pawl 37 from the ratchet-wheel 27, thereby disconnecting the hammer carriage and the shaft 5, while the latter magnet operates to lock the character keys. To cancel a character set up in error, a cancelling-kÚy is provided, which operates all the springs 42 and opens the circuit of the magnet 36 at the contacts 44, 45, so that no relative movement occurs between the hammer carriage and the disks 6, 7.