Card – picture – or sign exhibiting – Changing exhibitor – Motor operated
Patent
1995-08-14
1997-03-04
Dorner, Kenneth J.
Card, picture, or sign exhibiting
Changing exhibitor
Motor operated
40518, G09F 1129
Patent
active
056068140
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
This invention relates to an improved drive mechanism for winding a flexible film or sheet, hereinafter called a film, between spools. The mechanism is primarily intended for incorporation into an apparatus wherein the film carries a series of advertising posters which are successively displayed as the film is wound from one spool to another. It is an objective of the invention to provide an improved display apparatus of this type.
The most convenient means of driving a spool to rotate is through an axle carrying the spool. In poster changing devices this drive means presents a problem in that the surface speed of a spool for a given axle speed varies as the effective diameter of the spool increases whilst film is being wound on to it and vice versa. This variation in surface speeds may give rise to tightening and slackening of a film being wound between spools and speeds to be eliminated.
The present invention proposes to deal with this problem by providing a film moving mechanism for a poster display apparatus such mechanism comprising first and second spools between which a carrier film is wound, means for driving an axle carrying the first spool and an active linear connection between spool axles, said connection acting to control and vary the axle speeds so as to maintain the surface speeds of the spools substantially equal.
More specifically in accordance with the present invention there is provided a mechanism for winding a film between first and second spools which comprises a motor drive to an axle carrying the first spool, a drive cord or equivalent extending between pulleys or equivalents on respective axles of the first and second spools said cord carrying a weight which rises and falls as the effective length of the cord between pulleys varies to adjust the speed of the axle of the second spool to maintain the equality of surface speeds.
The invention will now be described as embodied in a display apparatus shown in the accompanying drawings wherein:
FIG. 1 is a front view of the complete apparatus with the front partly broken away and the carrier film enlarged to show the posters on its carrier film;
FIG. 2 is a section on the line II--II of FIG. 1;
FIG. 3 is a section on the line III--II of FIG. 1, and
FIG. 4 is a front view of the apparatus with the front of the casing removed and the film partly removed to show working parts.
The apparatus described and illustrated is intended for positioning in a public location such as a shopping precinct and is supported in its display position by means not shown, for example a pillar. The apparatus essentially comprises an upstanding and robust casing, rectangular with rounded corners and made of front and rear similar parts 1 and 2 fitting together as shown in FIGS. 2 and 3 with a rebate 3 and gasket 4 so as to provide a sealed and protected interior for the working parts. The casing parts are made of suitably strong material such as steel or reinforced plastics so that the interior and working parts are protected from the elements and damage. A viewing window 5 is provided at the front this being formed of suitable tough transparent material.
The poster changing and display mechanism seen in FIGS. 2 to 4 is positioned within the casing and comprises a carrier film F of translucent plastics, for example a polyester, wound between a first spool 6 and a second spool 7 over idler rollers 8 to provide a frontal working reach moving horizontally behind window 5 successively to display posters P (FIG. 1) to a viewer. In this specification the word `spool` is used functionally being a simple roller around which the film is wound. The four rollers are mounted to rotate between upper and lower cross members 9 and 10 fixed together by square section uprights 11. Vertically disposed fluorescent lamp tubes 12 or other suitable means are mounted between the uprights to provide back lighting and to illuminate the film F and the posters P carried thereby.
An electric motor 13 to drive axle 14 of spool 6 through gears is supported beneath lower cross mem
REFERENCES:
patent: 718763 (1903-01-01), Hoermle
patent: 1016944 (1912-02-01), Kent
patent: 4205801 (1980-06-01), Decaux
Melville James
Szywalla Henry
Adverite PLC
Davis Cassandra
Dorner Kenneth J.
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