Patent GB-411306-A (GB)
Title: Improvements in and relating to mechanism for drawing the tape derived at a varying speed from the ticker of a stock quotation projection machine, across the light aperture thereof
IPC: G03B21/134
Filed: 1933-07-04
Abstract: 411,306. Feeding webs. EITZEN, A. D., Rockville Centre, New York, U.S.A. July 4, 1933, No. 19013. [Class 100 (i).] A mechanism for drawing the tape derived from the ticker of a stockquotation projection machine across the light aperture thereof, comprising a tape puller for pulling the tape across the light aperture and a motor, is characterized by the provision of a variable-speed controlling- device which operatively connects the motor to drive the tape puller, and which includes an elongated lever engaging the tape at the anterior end of the light aperture and extending to the posterior end thereof, the arrangement being such that the lever is moved by the tape, when the tension thereof varies, to operate the speed-controlling device. The tape T, Fig. 1, passes from a high-speed ticker 1 under the finger 10 of a lever 11, over a roller 12 at the entrance end of the light aperture 3 of the projection machine 2, over a smooth-faced tapepulling roller 4, and around an idler roller 5 to a rewind reel 6. The roller 4, lever 11, and reel 6 are all part of a centralized unit associated with a casing 13 which can be removed from the projection machine 2 by removing two screws. A continuously-operating motor 18 on a support 19 drives a shaft 23, Fig. 3, mounted in the casing 13, by means of a belt and pulleys, and a worm 28 on the shaft 23 meshes with a worm-wheel 29 mounted on a stub shaft formed on a boss in the casing. A flange 33 formed on an internally-threaded member mounted on a shaft 35 is normally spring-pressed to engage frictionally the side of the worm-wheel 29 to constitute a slip-clutch for driving the tapepulling roller 4. The shaft 35 has mounted thereon a worm-wheel 37 which meshes with the worm 38 on a vertical shaft 39. The shaft 35 extends through the casing 13 and carries the pulling-roller 4 which is connected by a spring belt 90 to the reel 6. The worm-wheel 37 is provided with an extension at the side which forms a seat for one end of the spring which turns the flange 33 about the shaft 35 to frictionally engage the worm-wheel 29. When the worm 38 comes to rest, and thus brings the worm-wheel 37 and shaft 35 to rest, the continuing rotation of the worm-wheel 29 will cause the flange 33 to rotate in the opposite direction to the tension of the spring to disengage it from the worm-wheel 29. The rotation of the worm 38, and thereby the shaft 35, is controlled by a governor-mechanism comprising a collar 46, fixed on the shaft 39, carrying two spring arms 47, 48 having weights 52, 53 thereon, the spring arms being secured to a collar 49 slidably mounted on the shaft 39, and the collar 49 having formed at its upper end a disc 54 adapted to engage a face 55 of the top plate of the casing 13. The lever 11 is fixed on a shaft 61 mounted in the casing 13, and when the lever rises due to the tightening of the tape T, caused either by the stoppage of the ticker 1, or by the excessive speed of the pulling-roller 4, it rotates the shaft 61. A cam 62 mounted on the shaft 61 then lifts a pivoted lever 64 which presses the disc 54, against the action of the rotating weights 52, 53, into frictional engagement with the face 55, to slow down or finally stop the rotation of the shaft 39. The centre of gravity of the lever 11 is close to the pivot shaft 61 and the lever 11 is thus very sensitive to the variations in the feed of the tape T. The lever 11 comprises a weighted portion 70 secured by a screw to a light portion 71. The tape is held in engagement with the roller 4 by an idler 72 journalled in arms which are pressed towards the roller 4 by a coil spring mounted on the pivot of the arms. One of the arms has a finger-piece to facilitate withdrawal of the roller 72 from the roller 4. The re-wind reel 6 preferably consists of two discs 80, 81, Fig. 5, the latter disc being mounted on the shoulder of a hub 83 mounted on ball bearings on a pin 86, and the former disc being mounted on a hollow cylindrical member 93 adapted to slide over the hub 83 and engage the latter by a pin-and-slot connection. The member 93 has a head 96 within which is secured a wire finger 97 which extends over the outer face of the member 93 to secure the end of the tape on to the composite reel. When the reel is full the member 93 and disc 80 can be detached from the hub 83 by a simple turning movement. The images of the marks on the tape are projected by an objective lens 7 and a mirror 8 upon a screen 9.