DE7201148U - FILM REWIND DEVICE FOR PHOTOGRAPHIC CAMERAS WITH FOLDING BACK PANEL - Google Patents

Description

ERNST LEITZ GMBH 5 ~ Sign: B 2709 6 * 3 Wetzlar, den. 7th January 1972.

Pat Mü / GG ft »* -, 210/211

Film rewind facility for photographic Cameras with a hinged back wall

The invention relates to a film rewinding device arranged on the camera base and the associated cartridge chamber in photographic cameras with hinged back panels.

Film rewinding devices are known in photographic applications Cameras for film cartridges, in which the driving claws of the rewinding device in or from the film spool neck of the film cartridge are used to insert or remove a film cartridge must be moved by hand. It is known to use this facility on the top of the camera as well as on the To attach the camera base.

Moving the driving claw is cumbersome in terms of handling. In addition, a pull-out back-pulse crank on the camera base is difficult to display and is not suitable for using a motor attachment for back-flushing. The task was therefore to provide a device which simplifies the process of inserting and removing the film cartridge with the film spool neck straightened below and allows the use of a camera motor for backwashing.

According to the invention, this is achieved by the fact that the reverse axis of the reverse rotation device is connected to its end face a one-sided, an angled approach of the cartridge to the. Cartridge space enabling entrainment rna β β feet is connected, which is so in the film reel sharks of the film cartridge intervenes so that she does the necessary for filming Forces on the carrier bars in the film reel shark of the FlLm-

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² B 2709

7.1.1972.

PotwitobtwiunQ MÜ / GG

cartridge transmits, and that the cartridge space assigned to this device is unmistakable on its upper and lower cartridge system Insertion and easy removal of the film cartridge provided iat.

In one embodiment of the invention, the rewinding axis and the guide plate form a fixed unit. This requires an alignment of the driver nose in front of the film cartridge insert.

For this purpose, an automatic alignment of the driver nose with resilient means is proposed in the invention, which be placed in puncture when opening the rear wall and bring the driver nose into a favorable position for insertion.

In order to bring the pilm cartridge safely up to the cartridge chamber and to ensure that it is centered, it is advantageous to equip the rewinding axis with a longitudinally displaceable Pührsttaller which is pressed by a helical spring against the upper end of the rewinding axis and supports the driving nose in its effect when rewinding the film.

The further embodiment of the invention provides a reverse winding crank which is equipped with a rotational direction lock, so that the crank can only be rotated in the direction of the fiImrUokwioklung.

The invention further provides coupling means that the Loosely connected crank with the Rttokwickelaohse when unfolding the crank firmly with the Rückwiokelachse couple.

Z 7

'■ ^ Z

7.1.1972.

Patent department Mü / GG

Also in accordance with the invention are from the film rewinding device actuated feedback means provided that the proper film transport at any point the camera, for example in the viewfinder.

In the drawings, the invention is shown using the exemplary embodiment of a rewinding device with a longitudinally displaceable guide plate. Show it:

Fig. 1 is a perspective view of a section through the cartridge chamber of the main body of a photographic camera for film cartridges,

2 shows a schematic representation of an exemplary embodiment of an automatic alignment of the Driving nose.

In Fig.1, the cartridge room 2 is shown in the main body 1 of a photographic camera for film cartridges. A rewind shaft 7 of a rewind crank 10 with a rewind lever 11 is rotatably supported in the main body 1. A driver lug k is firmly connected to the rewinding axis 7. A guide plate 5 is arranged longitudinally displaceably on the rewinding axis 7 and is pressed against the upper end of the axis 7 by means of a helical spring 6.

A film cartridge shown in dashed lines in the drawing is at an angle of about 30 ° to 70 ° with its film spool neck Axis 7 brought up to this. The film reel 5 slides neck over the guide plate 5. Apply light pressure the coil spring 6 is the film cartridge around the imaginary Pivot point 3 pivoted into the cartridge chamber 2.

The TJ-shaped open spaces 12 and 13 ensure a smooth Pivoting in the film cartridge, which after completion of the loading process between the upper 8 and lower 9 Cartridge chamber is held. _ ^ _

^4th B 2709

7.Ί. 1972.

Patent department Mü / GG

The centering of the film cartridge in the cartridge chamber 2 is brought about by the resiliently sliding guide plate 5.

If the rewinding process is to be initiated after the film exposure has been completed, the crank lever is folded out 11 the rewind crank 10 fixed to the rewind axis 7 connected.

When the crank lever 11 is turned to the left, the driver se k , which is firmly connected to the axis 7, rests against the webs in the film spool neck of the film cartridge. The film is rewound.

The removal of the film cartridge is done in the reverse order to the loading.

The schematic representation in Figure 2 shows an embodiment of an automatic alignment of the driver nose, which is necessary when the rewind axis 7t guide plate 5 and driver nose k are firmly connected to one another. ⁷ ISeI such an embodiment, because of the intransigence of the guide plate 5, the driver lug k must be aligned in the pivoting direction of the film cartridge. For this purpose, a toothed wheel ″ \ k, which meshes with a second toothed wheel 15, sits coaxially on the Rückwicke1 axis 7.

The gear 15 in turn is connected via a loop spring 16 connected to a slide 17 connected by the rear wall, not shown. Pressed when opening the back of the camera the sole spring acting over a dead center the alignment of the take-away nose 4.

When the camera back is closed, the spring action is released disabled. _ »

72Θ114βΐ5.ί.72

Claims (2)

Protection claims . Film reel mounting on the camera base photographic cameras with a hinged rear wall, characterized in that the Rüokwioke salmon (7) the rewinding device on its end face with a one-sided, an oblique approach of the Cartridge is firmly connected to the cartridge space enabling driver nose (4), which is so in the film spool neck the film cartridge intervenes so that it exerts the forces necessary for film rewinding on the driver webs transfers in the film spool neck of the film cartridge, and that this device is assigned Cartridge compartment at its upper (8) and lower (9) cartridge system with U-shaped open spaces (12, 13) is provided for unmistakable insertion and easy removal of the film cartridge. 2. Film rewinding device according to claim 1, characterized in that that on the rewinding axis (7) a guide plate (5) is arranged, which with the axis (7) forms a solid unit. 3 film rewinding device according to claims 1 and 2, characterized in that resilient means (1 ^, 15 » 16) are provided, which automatically align the driver lug (4) in a position that is favorable for insertion. k. Film rewinding device according to claim 1, characterized in that a guide plate (5) is arranged on the rewinding axis (7), which sits longitudinally displaceably on the axis and is pressed by a helical spring (6) against the upper end of the rewinding axis and which during the rewinding of the film -6- Patent department Mü / GG B 2709 7.I.1972 Supporting the driving nose (k) in its effect. Film rewinding device according to claims 1 to characterized in that the rewind crank (1O) equipped with a direction of rotation lock iet, so that the crank can only be rotated in the direction of the reverse winding. Film rewinding device according to claims 1 to 5i characterized in that coupling means are provided, which with the reverse wrapping lactose in loosely connected crank when folding out the crank (1O) firmly to the rewind opening (7) couple. Film rewinding device according to claims 1 to 6, characterized in that it is actuated feedback means are provided that the proper Show film transport anywhere on the camera, for example in the viewfinder.