DE966436C - Device for attaching recording media, e.g. Film tapes, on the core of spools - Google Patents

Description

(WiGBl. P. 175)

ISSUED AUGUST 8, 1957

M 9874 IX / 57 a

Hans Hüttner, Zirndorf

has been named as the inventor

The invention relates to a fastening device for recording media, ζ. Β. Film tapes, for example, for clamping the ends of the film on film drums of cinema projectors is used.

While in the past and partly still today, the definition of the film ends on the drums took place in that the end - as shown in Fig. ι - through a slot in the core of the The bobbin is inserted and a few layers of film are carefully wound up to create the necessary Efforts have recently been made to achieve static friction, with the film ends already on the core to be attached so that an accidental sliding out before winding the film avoided will. This is achieved through a wide variety of facilities. So z. B. in a known Execution, as shown in FIG. 2, the slot in the core equipped with lugs on which the perforation of the film. In order to be able to define tapes without or without defined perforation, the film reel is made in a known manner from two parts, in such a way that one flange the hollow cylindrical core provided with slots and the other flange a similar one, carries into the first core that fits into it. The film is inserted into the slots, and the halves of the coil are twisted against each other until the slots are covered and the film is pinched as a result. This facility

709 622/57

device has the disadvantage, however, that with a tight fit of the two interlocking Parts of the film are so tightly clamped that there is a risk of tearing off or tearing off. Will the Fit but made loose so the two parts can fall apart, creating an ugly one Ball of film can arise. Another known device for clamping the film on the core shows a rotatable on the spool

ίο Swivel arm with which in the swiveled-out state the film can be easily inserted into a suitable clamp at the free end of the arm. After threading the film, the arm and the end of the film can then be folded in. Again another version has a clasp on the core into which the film can be threaded. These The latter auxiliary devices have the disadvantage that either an uneven winding arises on the bobbin or parts of the device protrude beyond the side surfaces of the bobbin, whereby the latter z. B. do not lie flat on a plate when used horizontally.

These disadvantages are avoided according to the invention in that in the interior of the coil core a clamping device forming an independent component is rotatably arranged by means of Define one inserted into a slot in the coil core The end of the tape is pressed so tightly against the inner wall of the spool core by twisting it is that when winding a slipping out of the film is avoided, but that when unwinding the clamping device is turned back by the tension of the film tape and the film is thus released. The advantages of such a coil are as follows:

1. Simple clamping of the recording medium on the reel.

2. Secure hold of the end even without wrapping the coil core several times.

3. Easy, automatic loosening of the clamping when running off the spool to prevent the Recording medium, tearing the perforation or damaging the apparatus.

4. Smooth outer surfaces without protruding parts in the design according to claim 4.

The known embodiments shown in FIGS. 1 and 2 are shown in FIG. 3 as an example of the embodiment according to the invention Device juxtaposed.

Fig. Ι shows the simplest type of film reel in section. 1 represents the outer wall, 2 is the Core with the slot 3. With 4 is inserted into the slot 3 and in several layers called folded film.

Fig. 2 shows the above-mentioned film spool with lugs. 1 again represents the outer walls, 2 the core with the slot 3, 4 the film and 5 represent the noses in which the film 4 with its perforation 6 hooks.

3 illustrates an exemplary embodiment of the device according to the invention, in which the front coil wall has been omitted for better visibility. It means ι the outer wall, 2 the core, 3 the slots, 4 the film and 7 the device according to the invention. This consists of the inner tube 8, which has a non-slip toothing 9 on its end faces. 10 shows the actual clamping elements which press the film tape 4 against the inner wall of the core 2.

The method of operation of the fastening device is explained in more detail below:

To wind up the film tape 4, its end is inserted into one of the slots 3 and fixed by turning the clamping device 7. Due to the special shape of the actual clamping members 10 , the fixing of the film 4 is possible both clockwise and counterclockwise. The inner diameter of the core 2 can then be made to be constant or to increase the pressing pressure away from the slots in both directions. The film tape 4 is held so firmly that it can no longer slip out of the slot 3 when it is wound up; but only so tight that when unwinding the film 4 from the spool, z. B. when playing in the device, by pulling the film tape 4 after complete unwinding, the end can slip out of the clamping device, z. B. in that the clamping device is rotated back by the band and the clamping device is thereby released. Damage to the film, tearing of the perforation or even tearing of the film and damage to the device cannot occur.

The use of the fastening device according to the invention is not only limited on Leuchtbdidfilmei, but is in the same way for tape or wire-shaped magnetogram carriers suitable.

_

Claims (3)

PATENT CLAIMS: 1. Device for fastening recording media, z. B. film tapes, on the core of preferably indivisible bobbins, characterized in that inside the bobbin core a clamping device forming an independent component is rotatably arranged, by means of which, one in a slot in the coil core inserted film tape end by twisting it so tightly against the inner wall of the no Spool core is pressed so that the film is prevented from slipping out during winding is that, however, the clamping device is rotated back during unwinding by the film tape tension and the film is released with it. 2. Device according to claim 1, characterized in that that the equipped with one, but preferably a plurality of clamping members clamping device is constructed so that it resiliently presses the film against the inner wall of the spool core. 3. Apparatus according to claim 1 or 2, characterized in that the clamping device is designed so that a clamping both in clockwise rotation as well done the other way around. 4 · Device according to one of claims 1 to 3, characterized in that the reel flanges do not have any parts protruding from the flange plane on their outer sides. S. Device according to one of claims ι to 4, characterized in that the coil core inside either cylindrical or tapered from slot to slot will. ίο Documents considered: German Patent No. 615 349; U.S. Patent No. 2,542,186. 1 sheet of drawings © 709 622/57 8.