Patent GB-191421538-A (GB)
Title: Improvement in Printing Telegraphs.
Inventor: WILEY CHARLES JAMES
IPC: H04L19/00
Filed: 1914-10-26
Granted: 1915-05-27
Abstract: 21,538. Wiley, C. J. Oct. 26. Type-printing telegraphs.-A predetermined slack is maintained in the tape common to two printing-instruments which are operated simultaneously, while the tape is fed uniformly through both instruments if one is inoperative. In the arrangement shown in Fig. 1, two printing - instruments A, B mounted on a common base-plate 11'are operated by weight motors controlled by electro-magnetic escapements 14, 15 and 16. 17 respectively. The magnet 14 is connected in series with a printing- magnet 22 and a magnet 32 in the line 34, 34', while the magnet 16 is connected in series with a printing-magnet 26 and a magnet 33 in the line 35, 35<1>. The armature 62 of the magnet 32 is mounted on the arm 61 of a bell-crank lever 61, 59, the latter arm of which carries a pin 58 engaging a slot 57 in a rod 49. The armature 36 of the magnet 33 is mounted on a spring-controlled lever 37 connected to a bellcrank lever 43, 44 by means of a link 47. The arm 43 of the lever 43, 44 carries a pawl 45 engaging a ratchet-wheel 42 connected to a pinion 41, which engages a rack 66 on the rod 49. The rod 49 carrying a tape-striking sector 99 is pressed downwards against the action of the pinion 41 by means of a compression spring 65 placed between a shoulder 51 on the rod and a rotatable head 52, through which the upper end of the rod 49 passes. The head 52 is rotatably mounted on a cylindrical projection of the base-plate 11, Fig. 4, by providing its rear with a cylindrical recess 53, and is held in contact with the projection by set-screws 55 which engage grooves in the projection. The magnet 33 is adapted to operate with the same cnrrent as that of the magnets 16, 26; but the magnet 32 requires a larger current to operate it than the magnets 14, 22, this extra current being supplied from a battery 100. Fig. 2. by the periodic closure of a switch 102 by one of the operators. The operation of the arrangement is as follows. Each time the instrument B is operated, the magnet 33 is energized to raise the rod 49 step by step until the pin 58 engages the lower end of the slot 57, and if the instrument A is operated faster than the instrument B, the predetermined amount of slack in the tape is restored by operating the magnet 32, which withdraws the pivoted rod 49 from engagement with the pinion 41 when the rod is forced downwards by the action of the spring 65, thereby causing the sector 99 to strike the tape. Transmitters C, D, Fig. 2, transmit impulses of opposite polarity to the instruments A, B respectively, by the rotation of the arms 67 through the medium of spring-controlled levers 69. The transmitter C is provided with a switch having a contactarm 76 and fixed contacts 75, 89, and an electromagnetically-operated switch 85, 90; while the transmitter D is provided with a switch having a contact-arm 79 and fixecl contacts 78, 96, and an electromagneticallyoperated switch 92, 97. To operate the instruments A, B simultaneously and Independently. the contact 76 is placed in engagement with the contact 75, and the contact 79 in engagement with the contact 78, so that the operations of the switches 85, 90 and 92, 97 produce no effect. To operate the instrument A. and not the instrument B, the latter is turned to a blank position in the wheel and held there, while the switch arm 76 is moved to engage contact 75, and the arm 79 to engage contact 96. The path of the current from the transmitter C is as follows: terminal 71, lead 77, contact 75, switch arm 76. lead 34, magnets 32, 22 14, Fig. 1, lead 34<1>, magnet 82, lead 83, and terminal 72. When the arm 67 of the transmitter C is stopped to effect a printing operation, the magnet 82 is energized for a sufficient length of time to operate the switch 92. 97, whereupon a current from the battery of the transmitter D is sent over the circuit thus: terminal 73, lead 95, switch 92, 97, contact arm 79, lead 35<1>, magnets 16, 26, 33, Fig. 1, lead 35, magnet 81, lead 84, and terminal 74, thereby operating the feeding-mechanism of the instrument B. Similarly, the instrument B can be operated while the instrument A is inoperative, by placing the contact-arms 76, 79 in the positions shown in dotted lines.