Patent GB-394272-A (GB)
Title: Stock quotation projecting machines
IPC: G03B21/134
Filed: 1933-01-30
Abstract: 394,272. Changing - signs. NEWS PROJECTION CORPORATION, 44, Whitehall Street, Manhattan, New York, U.S.A. Jan. 30, 1933, No. 2900. Convention date, Feb. 18, 1932. [Class 3 (i).] Optical-projection apparatus.-In a combined stock-quotation ticker and optical-projection mechanism, the tape-control means includes a tape-pulling roller, an interrupting- device in the form of a hub with yieldable wings operatively connected to the roller, a lever responsive to the deflections in the tape to control the interrupting-device, a continuously-operating electric motor, and a slippage device interposed between the motor and the roller for causing the roller to be operated when the interrupting- device is liberated, and to slip relative to the motor when the interrupting-device is arrested. The tape T, Fig. 1, passes from the high-speed ticker 1 across the light aperture of the lamp housing 2 provided with supporting rollers, around a pulling roller 6, and is rewound on a reel 33. The roller 6 is supported from a casing 8 on a shaft 7, Fig. 2, to which is secured inside the casing a worm-wheel 10 in mesh with a worm 11 freely mounted on a shaft 12 continuously rotated by a motor 9 through a belt and pulley arrangement. The shaft 12 has fixed thereon a disc 21 against which the worm 11 is pressed by a spring 24 to form a friction drive. A thrust bearing 26 is interposed between the spring and the worm. The rewind reel 33 is driven from the shaft 7 through a spring or other yieldable belt 38 which slips to compensate the increasing pull in the tape T as the reel increases in diameter. The tape is maintained in engagement with the roller 6 by a pressure roller 29 pivoted on the casing 8 and provided with an arm on which slides a weight 32. A small pinion 42 mounted on a ball bearing on a stub shaft in the casing 8 and driven by a gear-wheel 41 on the shaft 7 in provided with a hub which carries two tangential oppositely disposed wings 46, 47 composed of resilient material. The wings co-operate with the finger 48 of a control arm 40 which extends across the light aperture of the projection system and bears on a loop in the tape T between the ticker and the light aperture. The finger 48 is formed on a bracket arm 49 pivoted to an extension of the casing 8 and provided with a split tubular extension 52 which receives a bent rod 56 forming part of the control arm. As soon as the ticker stops printing, the loop in which the control arm 40 bears is straightened out by the tapepulling means, and the finger 48 is depressed into the path of the wings 46, 47 of the pinion 42 to bring the latter to rest ; the gear-wheel 41, worm-wheel 10 and roller 6 also come to rest, and the thrust of the worm 11 on the worm-wheel 10 caused by the rotating shaft 12 moves the worm 11 away from the rotating friction disc 21 against the action of the spring 24. When the ticker again operates, the finger 48 is lifted out of the path of the wings 46, 47 and the worm 11 is then urged into engagement with the rotating disc 21 to drive the tape-pulling roller 6. The control arm 40 engages the tape through a finger or a roller 59 and dissipates the vibrations set up in the tape by the ticker 1. The characters on the tape are projected through an objective lens in a housing 60 on to a mirror 63, reflected on to a mirror 62, and projected on to a screen 64.