Patent GB-182531-A (GB)
Title: Improvements in and relating to advertising machines
IPC: G09F11/29
Filed: 1921-03-30
Abstract: 182,531. Duval, J. W. March 30, 1921. Reel and web apparatus.-A cabinet 18 is provided with glazed opening at 20 for the display of sheets bearing advertisements and a glazed opening at 19 at which appear sheets bearing information. The advertisements are automatically changed at intervals, and the sheets appearing at the opening 19 are selectively brought into view when required. The sheets are in each case mounted on spring rollers which are carried on wide endless chains built with bearings for the rollers at each side. The sheets are unrolled and allowed to roll up by reciprocating mechanism, and the chains are then moved to bring another roller into the path of the reciprocating mechanism. Fig. 13 is a plan view of the rollers 67 bearing advertisements which appear at the opening 20, mounted on two chains 64, so that an advertisement is drawn out to occupy the opening 20 as the previous one is being withdrawn. The reciprocating mechanism comprises a plate 53 having hooks 53<a> which engage projecting ends of a rod 68 on the free edge of each sheet. The plate 53 is connected to a chain 51 passing over toothed wheels, one of which is fixed on a shaft 49 alternately turned in opposite directions by a constantly rotating motor 26, Figs. 4 and 6. The chains 64 are moved by spring-retracted pivoted arms 79 pressed by contact with the plate 53 to rotate ratchet-wheels 73 by pawls on the arms 79. The reversing-mechanism for the shaft 49 comprises toothed gearing in conjunction with a sliding clutch at 32 actuated by a lever 44 operated by a cam 43a. A spindle 62, Figs. 4 and 6, is oscillated by projections on the chain 51 to move the clutch 32 into a neutral position to provide an interval of rest for the sheet when displayed. The control mechanism for the information sheets appearing in opening 19 comprises a selector wheel 24 and pointer 23b and a press spindle 123. Rotation of the wheel 24 tensions a spring 89d which, when released in due course, moves the chain 105<a> of rollers through the requisite distance for engagement by a vertically reciprocating bar 109 carrying hooks 202, Figs 4 and 12, return of the wheel 24 being prevented by a ratchet and pawl 92. The reciprocation of the bar 109 is effected by mounting it on chains 111 passing round toothed wheels 112, 115, Figs. 4 and 6, operated through gearing the reversal of which is effected by a clutch member 84 sliding under the influence of a cam 143<a>. Downward pressure on the spindle 123 rotates a shaft 131, which moves a clutch member 134 into engagement for operating the information-bearing mechanism by the motor 26, a catch being pro vided for holding down the spindle 123 until the hooks 202 have made a complete down and up movement to return the sheet last displayed and to extend the required sheet. The spring 89<d> tensioned by the wheel 24 is released by pressure of the bar 109 at the bottom of its path in a spring-pressed locking lever 147, the chain 105a then being rotated by the required amount to present the new sheet-roller to the hooks 202, and being again locked by the lever 147 as the bar 109 rises. A locking-lever 160 prevents rotation of the wheel 24 when the spindle 123 is pressed down and the information-bearing mechanism is in operation.