Patent GB-191126450-A (GB)
Title: Improvements in or connected with Means for Intermittently Indicating or Displaying the Names of Stations or Stopping Places in Trains or other Vehicles or other Situations or other Devices or Matter in such Vehicles or other Situations.
Inventor: EVANS CHARLES JOHN
Filed: 1911-11-25
Granted: 1912-11-25
Abstract: 26,450. Evans, C. J., and Cater, J. M. Nov. 25. [Cognate Application, 4272/12.] Systems for controlling travel for a fixed distance or number of revolutions.-An apparatus for displaying the names of stations, advertisements, numbers, &c., consecutively or selectively, is provided with a perforated or slotted band &c. for starting and stopping the traversing means, and electromagnetic devices in connexion with the slotted band, powerdriven, or manual devices, for reversing the direction of travel of the displayed member. Various modifications are described, but essentially a perforated display band 18, Fig. 28, passes between a metallic cylinder or bar 14 and conducting brushes 28<a> ... 28<i>. A jacquard 68 is moved, for example by a reciprocating clawker engaging perforations in it, until one of the brushes 67<a> ... makes contact through a perforation 68<b>, and, when the corresponding brush on the band 18 enters a slot, the motor armature terminals are short-circuited, and the apparatus stops. On moving the jacquard 68 forward, the short-circuiting is ended, and the motor starts again. When slots 115, 116 reach the brushes 112, 113, the magnet 109 is shortcircuited, and the magnet 108 alone is energized and attracts an armature 107<a>, throwing the clutch 102 into action and driving in one direction; but with perforations 116, 117 engaging the brushes 113, 114, the clutch 103 is thrown into action and the web reversed. In the reversing-device just described, a jacquard card may determine when reversal is to occur, and the position of the fork 107, Fig. 26, may determine which of the two zero brushes on the web 18 is to be actuated by contacting with one of two contacts, connected with them according to the direction of travel of the web. The brushes 112, 113, 114 come into operation much as before. In modifications of the apparatus, the jacquard 68 is replaced by a switch, and other than an electrically - operated motor is employed, such as a pneumatic motor with its valve controlled electromagnetically. The slots in the display band 18 may be elongated and overlap and cause actuation of the band when the brushes are brought into contact with the cylinder; or the contact of the brushes with the cylinder may actuate an electromagneticallycontrolled detent on the motor. In one device, the contact brushes are selectively put in circuit so as to stop the slotted band at any desired position, the switch for the purpose reversing the driving-motor each time it is itself reversed in its direction of travel. In another device, the jacquard selectively energizes one of a series of magnets and puts a particular brush 28<a> ... 28<i> into circuit with the motor armature, but for the intervention of the band 18. In another modification, a jacquard controls a motor so as to give a certain number of revolutions to an electrical contact-breaking device, which conveys a desired number of impulses to a selector switch for determining which brush 28<a> ... 28<i> is to be set for operation. A jacquard may be arranged to control the direction of rotation of the motor directly or electromagnetically. According to the Provisional Specification, the sliding pinion for reversing the direction of travel of the web may be replaced by a ratchet device, or by a pair of cams for engaging one of a pair of projections according to the direction of rotation of the cams.