Abstract: A microfilm reading and reverse enlarging apparatus with a copying beam for a gap illumination comprises a copy carrier movable with a constant speed, drive device for moving the copy carrier, a film platform for a film and adjustable relative to an illuminating beam, transporting device for reciprocating the film platform synchronously with the movement of the copy carrier, control device for controlling the transporting device, a potentiometer adjustable by the transporting device synchronously with the movement of the platform so as to produce respective values in response to the movement of the platform during a copying process of successive microimages, and storing and comparing device arranged to store preselected values and to receive the values of the potentiometer to compare them with the preselected values, the storing and comparing device being connected with the control device so that the transporting device and the drive device for the copy carrier during reaching by the values of the potentiomet

Abstract: An apparatus for viewing microfiches held in a cassette has a housing defining a rear seat for the cassette holding the microfiches and having a front viewing area, an optical system on the housing for viewing a microfiche in the area, a holder constructed to carry one of the microfiches displaceable on the housing in the area with respect to the optical system for presenting selected portions of a microfiche carried by the holder to the optical system, and a selector in the housing for separating a selected microfiche in the cassette from the other microfiches in the cassette. A drive support is rotatable about and displaceable along an upright axis between the viewing area and the cassette-holding seat and has a pair of generally diametrally opposite arms having outer ends provided with respective drive rollers.

Abstract: A collapsible microfilm reader having a lower body part with a micro-fiche projector and a cover hinged thereto and having a rectangular projection surface or screen on its inner surface which is operatively positioned when the cover is in its open position. The hinge or hinges which connect the body and cover are readily disconnectable and connectable so that the cover can selectively be mounted on the body with the long or short axis of the screen aligned with the central axis of the projector thereby permitting the optimum projection of micro-fiches of different formats by changing when necessary the orientation of the positioning of the cover on the body rather than requiring different positioning of micro-fiches of different formats with respect to the projector.

Abstract: Portable microfilm reader having a body with a microfilm holder, a projection lamp, a foldable reflecting mirror, a hinged cover, and a projection surface or screen on the inside of the cover. The invention provides means for automatically erecting the mirror when the cover is opened, and automatically folding the mirror when the cover is closed. Means is also provided for automatically turning the projection lamp off when the cover is closed.

Abstract: A holding frame holds a microfiche. Guide rails mount the holding frame on the microfilm reader housing for movement along two perpendicular coordinate axes for moving selected portions of the microfiche held by the frame into position to be projected. An arresting device arrests the frame in selected positions and includes a stationary clamped structure on the housing and a cooperating releasable clamping structure on the frame. The clamping structure when not released clamps the clamped structure and thereby arrests the frame relative to the housing.