Picture changer for large-scale picture projector

Details Picture changer for large-scale picture projector Picture changer for large-scale picture projector

1979-02-23

1981-04-28

Stephan, Steven L.

Optics: image projectors

Slide transfer mechanism

Slides gripped or hooked

353DIG5, G03B 2300

Patent

active

042641586

ABSTRACT:
A picture plate changer for changing pictures projected with a large scale picture projector, e.g., overhead type projectors projecting a single picture from an entire picture plate. A magazine stores the picture plates as a stack of flat plates or plexiglass each placed in horizontal slots or tracks in the changer. The stack of plates are vertically shiftable to selected disposition so that a desired entire picture is accurately indexed to a location just above the level of the projector plate and interconnectors on each frame selectively cooperate with a mechanism which can engage and shift a selected picture and frame from the magazine to the projector and back. Power mechanisms and control means are shown to enable selection and operation of the changer in a pre-determined manner. Devices on the changer and the picture plates assure accurate positioning for projectors.

REFERENCES:
patent: 2898807 (1959-08-01), Ewald
patent: 3269261 (1966-08-01), Porter
patent: 3528735 (1970-09-01), Bluitt et al.
patent: 3743400 (1973-07-01), Haning et al.
patent: 4087005 (1978-05-01), Kinsinger et al.
patent: 4120573 (1978-10-01), Johnston

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