Device for storing and handling slides

Claim 1

In a device for storing and handling slides for their selective display, comprising at least one storage rack for slides, means for displacing the racks under the control of a data processing machine so that any selected slide may appear in front of an extraction window, means for extracting the selected slide through said window towards at least one display position or vice-versa, and a projection unit in juxtaposition to said window permitting the extracted slide to be displayed on a screen, the improvement wherein there exists a plurality of circular storage racks (6) forming a unit of racks stacked according to a common vertical axis, said means for displacing the racks comprise a reversible motor (27) for vertically displacing the unit of racks (6), a cylindrical envelope encloses the unit of racks and the means for displacing the racks and the extraction window is (7) is cut out in a cylindrical wall (8) of said envelope, a motor (18) is mounted within said cylindrical envelope for rotating the unit of racks about said axis, the racks (6) rest on a disk (16), an elevator plate underlies said disk and said disk is carried by said elevator plate (17), said motor (18) driving the unit of racks into rotation is mounted on said elevator plate, a motor (27) drives a vertical threaded shaft (24) supported by a bottom (26) of the device and is engaged with a nut (23) which is immobile in rotation and which is fixed to the elevator plate (17) to effect vertical displacement of the racks and wherein the data processing machine (3) controls the extraction and the replacement of a slide (31) in accordance with the memorized sequence selected previously by the user and with the instantaneous position of the unit of racks.