Abstract: In a microfilm reader-printer working according to the rotational principle one of the fixed deflecting mirrors (11, 12) by which the image is to be projected on an exposure area (13) is made and arranged in a flexible manner. A deflecting device (14) formed by a magnet coil (15) and a pusher rod (16) is continually bending one of the deflecting mirrors (11, 12) during the exposure of the base material in such a way that an image is produced that is free from distortions.

Abstract: A lens sleeve designed to float in a lens holder. A focussing device with a servomotor and an eccentric fixed directly at the lens sleeve, with said eccentric gripping below a collar of a lens guided in the lens sleeve.

Abstract: A transport mechanism for film cards having two rocker levers supported on a pivoting lever that can swivel around a shaft, with the rocker levers being capable of pivoting around a rocker lever shaft. The two rocker levers, in turn, support two opposite discs, one of which is driven by a motor. A gripping motion of the discs is brought about by provision of guide grooves located on the rocker levers, with each groove accommodating a stationary pin. Through provision of an intermediate carrier, the upper disc is fixed to the upper rocker lever in a manner that it can pivot around a horizontal axis which is at right angles to the rocker lever shaft. Therefore the upper disc can be tilted in the respective direction of transport.

Abstract: A microfilm reader with a lens holder moved independently of a lighting unit at right angles in relation to the beam path by means of a drive unit. This renders it possible to correctly position any of a plurality of lenses arranged side by side in the lens holder in relation to the frame to be projected. Given that the lighting unit and the lens holder are capable of moving independently of each other, it is furthermore possible to shift the lighting unit into a position above the respective frame to be projected to obtain an image that is optimally illuminated.

Abstract: In a device for transporting flat objects from one station to another the stations are opposite each other, in the same plane, at an obtuse angle. The one station can be a film card holder, the other station a film card magazine. Since the two stations are not in line, a gap is provided between them. At the narrowest side of the gap a transport mechanism is located for transporting the objects.

Abstract: A transfer device to transport a film card from a film platform of a microfilm reading machine to a cassette and in the reverse direction has a transport device which has two mutually opposite rotary disks which are approachable towards each other like the jaws of tongs. This transport device is capable of moving towards the film card, so that the film card passes between the disks. One of the disks is driven so that the film card is transported as soon as it passes between the disks. Due to the arrangement of a pair of disks, the transport device is extremely flat so that it can withdraw a film card from a cassette without the need for it to be slid into the induction region of the transport device by means of, for example, a ram.

Abstract: The film reader has a substantially cubic housing one wall of which is formed with a projection screen, an intake slot for a film to be projected, a focus control knob and two slots for position control levers movable along mutually normal axes near the screen. The transmission means between a film holder and respective control levers include a longitudinal carriage movable on two guiding tracks along one axis and supporting a transverse carriage for a transverse movement along the other axis. Each lever is pivotable about a fixed pivot point in mutually normal planes and is provided with an equalizing lever cooperating with a pin and slot guide. One control lever has an equalizing elbow lever hinged to a transmission lever extending transversely to the control lever and coupled to one side of the longitudinal carriage. The other control lever is coupled to the transverse carriage which supports the film by means of a closed loop Bowden wire.

Abstract: The film reader has a substantially cubic housing one wall of which is formed with a projection screen, an intake slot for a film to be projected, a focus control knob and two slots for position control levers movable along mutually normal axes near the screen. The transmission means between a film holder and respective control levers include a longitudinal carriage movable on two guiding tracks along one axis and supporting a transverse carriage for a transverse movement along the other axis. Each lever is pivotable about a fixed pivot point in mutually normal planes and is provided with an equalizing lever cooperating with a pin and slot guide. One control lever has an equalizing elbow lever hinged to a transmission lever extending transversely to the control lever and coupled to one side of the longitudinal carriage. The other control lever is coupled to the transverse carriage which supports the film by means of a closed loop Bowden wire.

Abstract: The adjustable objective holder for optical projectors has a focussing support formed as a single piece defining two pairs of juxtaposed walls forming a parallelogram. The walls of one pair are rigid whereas the walls in the other pair are flexible. One rigid wall is fixedly mounted to the apparatus and supports for rotation a control shaft. The opposite rigid wall has on its inner surface a control groove which engages an eccentric formed on the end of the control shaft so that during the rotation of the eccentric the flexible walls are uniformly swung and due to the parallel linkage the movable rigid wall together with the objective performs a linear movement at right angles to the transparency.