DE960688C - Device for transporting roll films in cameras - Google Patents

Description

ISSUED MARCH 28, 1957

B 25974IX / 57 a

The invention relates to a device for transporting roll films in cameras below Use of an element that can be pressed against the film to be transported. The new device allowed es, perforated or unperforated film strips under a moving film carrier precisely in the respective To transport image distance.

Known devices of this type are that the film strip in the camera means

ίο Transport roller, transport wheel or more directly Rotation of a coil core is drawn into the cassette space. Make such devices the presence of a take-up reel is always required.

A device has become known in which the film is advanced in such a way that that the pressure element is pressed against the film with the interposition of a friction-increasing layer and this thereby against the picture window frame, on which the film rests or on which it slides during transport, is pressed. The disadvantages of this arrangement are obvious because the film is under increased Pressure drawn over an area that must be specially processed for this purpose in order to also include the to prevent the slightest damage to the film surface, and damage still occurs on the film by entrained dust particles or the like, which can hardly be removed.

This disadvantage of the known device is fully eliminated by the subject matter of the invention avoided, as there is friction between

an area of the film under increased pressure and an area over which the film is drawn will not occur. According to the invention is namely in the area of the pressure element, on the opposite side of the film an additional part is arranged, against which the film is supported, which slides on a surface and which the transport movement of the film participates completely, so that the friction due to the increased contact pressure does not occur between the Fiknfläche and a sliding surface, but between the latter and the additional part occurs and is therefore harmless to the film material. In addition, the new device has the further advantage that during the return movement the driver does not slide on the film surface because it is lifted off by a return spring.

According to the invention, on the side of the film opposite the pressure element, is in the area of this element, a sliding part arranged following the movement of the film, the through a web running transversely to the film movement of a film carrier guided in the camera housing can be formed.

It is useful in a further embodiment of the invention that the web in a recess of the Fiknführung runs and 'the pressure element grips the film on both sides of the film window area. The preferably displaceable against spring tension on pressure element can as a two-armed Lever be formed, one lever arm with the film and the other with a switching device communicates. It is also designed so that when the switching device is actuated the element first pressed against the film and this against the sliding part and then this be transported. When arranging an already mentioned return spring can after When the film is transported by one frame width, the actuating device is released, it will then together with the driver, which is thereby lifted off the film, back into its starting position promoted.

The switching device can for example consist of a sliding switch button.

In the drawing, an exemplary embodiment is shown in plan view, in longitudinal and cross-section Invention shown, which a film transport device shows in a stereo camera, in which without using a take-up reel the film at the same Is pushed away at intervals in the cavity of the camera. Capturing the filmstrip takes place inevitably; the switch button only needs to perform a longitudinal movement, whereby the film pressed against the moving bridge of the film platform and inevitably taken along will.

The film carrier 5 is slidably guided in the base plate U. The footbridge G of the film stage lies in the film plane. A camshaft N , likewise rotatably mounted on the film carrier, is in engagement with a switch button M of the camera housing. The two approaches / the camshaft N are pressed against the edge of the film.

The film is inserted using a filled cassette K? which is inserted sideways through an opening in the camera. The film is pulled a few centimeters out of the cassette and inserted into the film path of the camera until it can be gripped by the clamping cams j.

The camshaft is inevitably pivoted about the pivot point D by a longitudinal movement of the switch button M , the clamping cams / the film pressing firmly against the web G of the film carrier 5. Only when the clamping cams have gripped the film on the bridge can the film carrier be carried along and the film transported by path s. The way is limited by stops.

As already mentioned, it is provided in this arrangement, the exposed film strip in one to push in the corresponding cavity of the camera, so that a take-up reel is no longer necessary and an unnecessarily exposed leader of the filmstrip is avoided.

The return spring acting on the actuating button or on the part N causes the driver to automatically return and at the same time lift it off the film surface during the return movement, so that sliding on the film is avoided.

Claims (9)

PATENT CLAIMS: 1. Device for transporting roll films in cameras using a to the transporting film pressable element., characterized in that on the Pressure element opposite side of the film, in the area of this element, a sliding, the movement of the film is arranged following part. 2. Device according to claim 1, characterized in that that the sliding part by a web running transversely to the film movement is formed in the camera housing guided film carrier. 3. Apparatus according to claim 2, characterized in that the web in a recess the film is running. 4. Apparatus according to claim 1, characterized in that that the pressure element grips the film on both sides of the film window area. 5. Apparatus according to claim 1, characterized in that that the pressure element, which is preferably displaceable against spring tension, as two-armed lever is formed, one lever arm with the film and the other with a switching device is in connection. 6. Apparatus according to claim 1 or 5, characterized by a formation of the Andriickelementes and the switching device coupled therewith such that upon actuation of the The latter first the film against the sliding Part is pressed and then transported. 7. Apparatus according to claim 5, characterized in that on the arm of the lever on which engages the switching device, a return spring is articulated. 8. Apparatus according to claim 5, characterized in that the switching device from consists of a sliding switch. 9. Device according to one or more of the preceding claims, characterized by a guide of the pressed film moving with the sliding part such that it is pushed into a cavity by the pressure element. Publications considered: German Patent No. 638 285. 1 sheet of drawings © 609 656/287 9. (609 845 3.57)