US 4,063,465 AGranted

Magazine feeding mechanism for dual slide projectors

AssigneeRollei-Werke Franke & Heidecke

InventorReinhard Sobotta

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Abstract

Mechanism for feeding a picture slide magazine in such a way that picture slides can be taken out of the magazine in the same order in which they are placed in the magazine, for delivery to two separate projector units of a dual slide projector, and then can be returned to the magazine still in proper order. Two indexing gears rotate in opposite directions about a common axis of rotation. Each gear carries index pins or projections which cooperate with a star wheel or modified Geneva gear as the indexing gears rotate, and the star wheel or Geneva gear drives two pinions which engage a toothed rack on the slide magazine. As two indexing pins located relatively close to each other on one indexing gear pass the star wheel, they rotate the star wheel through two increments, to feed the magazine through two steps in one direction. As a single pin on the other indexing gear moves past the star wheel in the opposite direction, it turns the star wheel through one increment in the opposite direction, thus feeding the magazine through one step in the opposite direction. Thus the magazine is moved with the "pilgrim step" movement necessary when picture slides from a single magazine are to be projected alternately in two separate projector units and are then to be returned in proper order to the original magazine.

Claims12

Dependent claims

Magazine feeding mechanism for a dual slide projector wherein picture slides are to be taken in continuous succession from a single magazine and delivered alternately to two separate projection gates and then returned to the magazine in their original sequence, said feeding mechanism comprising

a. magazine feed pinion means meshing with rack teeth on a slide magazine and effective, upon rotation of the pinion means, to feed the magazine;
b. an indexing wheel operatively connected to said pinion means to cause turning of said pinion means upon rotation of said indexing wheel;
c. a first indexing gear and a second indexing gear rotatably driven only during a slide change and rotatably driven simultaneously in opposite directions to the same angular extent during each slide change, said angular extent amounting to 360.degree./n where n is a positive integer greater than zero;
d. indexing means carried by each of said indexing gears for engaging with and causing rotation of said indexing wheel wheel during said simultaneous rotation of said indexing gears;
e. said indexing means carried by the first indexing gear being arranged for first turning said indexing wheel in one direction to one angular extent and said indexing means carried by the second indexing gear being arranged for subsequently turning said indexing wheel in the opposite direction to a different angular extent upon said simultaneous rotation of both indexing gears to the same angular extent.

2 more elements

Dependencies are inferred from the claim text.