Patent GB-403004-A (GB)
Title: Stock quotation projecting machines
IPC: G03B21/134
Filed: 1933-05-04
Abstract: 403,004. Changing signs. EITZEN, A. D., Rockville Centre, New York, U.S.A. May 4, 1933, No. 13023. [Class 3 (i).] Optical-projection apparatus.-A stock quotation projection machine is provided with a device for pulling the tape across the light aperture, driving means for the tapepulling device, and a tension device for imitiating the actuation of the tape-pulling device independent of the driving means and provided with electrical contacts which the tension device, after it has initiated the actuation of the tape-pulling device, operates to cause that actuation to be taken over by the driving means until the tension of the tape is increased beyond a predetermined amount. The tape T, Fig. 1, passes from a ticker mechanism 1, across the light aperture of the projection machine 2, around a pulley 14 and a pressure roller 15, around a finger 23 of a pivoted brake arm 24 bearing on a brake drum 26, and is rewound on a reel 4 attached to the drum 26. A member 13 dissipates the vibrations in the tape prior to its passage across the light aperture. The roller 15 is mounted on a pivoted arm 16 which is influenced by a spring 20 towards the pulley 14, with which it is concentric. A continuously-rotating motor 40, Fig. 7, drives through a belt 37 and pulley 38 a combined pulley 36 and magnetic clutch member 43 loosely mounted on a shaft 35. When the clutch member 43 is energized it attracts, against the action of an interposed spring, a disc 41 secured to the shaft 35 so that the latter is rotated to drive through a pinion 34 and gear 33 the shaft 32 on which the pulley 14 is loosely mounted. The shaft 27 of the reel 4 and brake drum 26 is mounted on an extension 22 of the machine 2 and is driven from the shaft 32 by pulleys 29, 31 and a spring belt 30. The clutch member 43 is provided with collector rings 45, 46 engaged by brushes 50, 47 respectively, and the pulley 14, Fig. 3, is provided with collector rings 53, 54 engaged by brushes 52, 55 respectively, the brushes 47, 55 being connected to electrical mains by a plug 49. The ring 54 is connected by a conductor to a contact 58 mounted on the cylindrical portion 59 within the pulley 14, and the ring 53 is connected by a conductor with a contact 61 (not shown) mounted on the free end of an arm 62 attached to a hub 66 fixed on the shaft 32 within the pulley. The hub 66 has connected thereto one end of a coil spring 67 coiled around the shaft 32, the other end of the spring being secured to the disc portion 68 of the pulley 14. When the ticker 1 starts operating and feeding the tape T, assuming the contacts 58, 61 to be open, the tension in the spring 67 will first act on the pulley 14 to bring the contact 58 into engagement with the contact 61 ; thereupon current passes from the mains through the brushes 55, 52 to complete the circuit through the magnetic clutch 43 to energize it and attract the disc 41, whereupon the motor 40 drives the shaft 32 which rotates the pulley 14 through the intervening spring 67. When the ticker stops feeding the tape T therefrom the pulley 14 stops, but the arm 62 therein continues to rotate with the shaft 32 so that the contact 61 leaves the contact 58 ; the circuit through the magnetic clutch 43 is thus broken, the disc 41 released from driving connection therewith, and the shaft 32 and arm 62 are brought to rest. A control or governor mechanism to prevent the spring 67 from actuating the pulley 14 too suddenly when the ticker 1 starts consists of a gear 70 mounted on the shaft 32 for one-way rotation in the opposite direction [opposite] to the latter, and in mesh with a considerably smaller gear 72 mounted on a shaft 73 carried by a housing on the pulley 14. Centrifugal friction shoes 79, 80 on the shaft 73 are situated in the housing. The projection machine 2 is of the type having a lamp housing 5, an extension 6 provided with the light aperture, and an objective lens 7 secured by a bracket 8 to the part 6 over the light aperture. The images are directed on to a screen 12 by two inclined mirrors. In a modification the driving motor is started and stopped with the ticker since no clutch device is provided and the contacts within the pulley 14 control the motor circuit.