Patent GB-463379-A (GB)
Title: Improvements in stock quotation projecting machines
IPC: G03B21/134
Filed: 1936-08-14
Abstract: 463,379. Type - printing telegraphy. EITZEN, A. D. Aug. 14, 1936, No. 22430. [Class 40 (iii)] [Also in Group XVI] A stock ticker having a tape feed is combined with a device for disabling the tape feed to release the tape after the ticker comes to rest, and with a tape-pulling device for drawing the tape from the ticker when the tape feed is disabled. The ticker is described as combined with a projection apparatus, and the purpose of the invention is to ensure that when the ticker stops printing, the last-printed quotation on the tape will be projected on to a screen. The tape T passes from the supply reel 10 in the stock ticker 11, between a feed roller 13 and pressure roller 14, over guides 15, 17, across an extension 2 of the projection apparatus, under a guide roller 22, over a tapepulling roller 24, and then under a guide roller 26 to the rewind wheel 27. The finger of a weighted lever 19 pivoted on the extension 2 bears on the tape just before it passes over the extension 2 to damp down the vibrations in the tape. A motor 37 drives through reduction gearing the tape-pulling roller 24, and the rewind reel 27 is driven from the reduction gearing through a spring belt. The pressure roller 14 in the ticker 11 is pivoted and spring-pressed towards the driven roller 13, and is adapted to be drawn away from the roller 13 when a magnet 43 is energized. The two terminals of a tiltable mercury switch 50 are connected to the supply mains 61, 62, the motor 37 is connected to one terminal 66 of the switch 50 and to the supply mains, the magnet 43 is connected to the terminal 66 of the switch 50 and to a terminal 57 on a further mercury switch 53, and the other two terminals on the switch 53 are connected to the supply mains and a magnet 74. The switch 53 is mounted on a bracket 54 pivoted at 55 to move through a limited arc. Pivoted on the bracket 54 is one end of a lever 71 the end 16 of which bears on the tape T between the guides 15, 17 to form a loop in the tape. The magnet 74 is mounted on a bracket 76, and an armature lever 78 is pivoted on the bracket at one end and connected at the other end by a spring 84 to the switch 50 which is pivotally mounted on the same bracket. A spring 80 tends to force the lever 78 away from the magnet 74. The lever 78 is connected by a link to the piston of an oil dash-pot 90, the piston being allowed free downward movement, but only a slow upward movement. In operation, when the ticker 11 begins to print and discharge tape, the tape will form a loop to permit the finger 16 to descend and thus move the bracket 54 about its pivot, whereupon the mercury in the switch 53 will connect only those terminals thereon which energize the magnet 74. The magnet 74 attracts the armature lever 78 which rocks the switch 50 to cause its two terminals to be bridged by the mercury and consequently the motor 37 is started to initiate the tapepulling operation. When the ticker stops printing, the loop in the tape is absorbed so that the finger 16 ascends. The bracket 54 is then moved, the connection between the switch 53 and the magnet 74 is broken, and the magnet 43 is energized to withdraw the pressure roller 14 from the roller 13. The tape-pulling roller 24 will continue drawing the tape T during the slow upward movement of the lever 78 and until the switch 50 is tilted sufficiently to break the connection to the motor 37. The time taken for the latter operation is sufficient to allow the last printed quotation to reach the light aperture to be projected on to the screen 8.