DE7221230U - Storage means for winding cores in magnetic tape cassettes, in particular in compact cassettes - Google Patents

Description

BadiFChe aniline &. Sode-Fabrik AG

Our reference: O.Z. 29 205 DE / AR

6 ⁷ OO Ludwigshafen, ooi972

Bearing center], for winding cores in magnetic tape cassettes in particular

in compact cassettes

The invention relates to storage means for winding cores in magnetic tape cassettes especially in compact cassettes, with the winding cores between ring collars on the base and cover walls the cassette are stored and arranged between the winding cores and the bottom and top walls bearing foils with embossing are.

With the German utility model 1 996 273 are for tape cassettes Inserts, with radial over the magnetic tape wraps outwardly extending groove-shaped embossings known. the Embossing of the leaflet serves as a resilient support on aen tape reels for the correct tape and tape reel guidance with reduced electrostatic charge of the magnetic tape. Such radially arranged embossments have proven to be too great a braking effect, so that the device-side Torque is exceeded in an impermissible manner. Also, are the guiding effects exerted on the tape and the tape packs not sufficient for fail-safe cash register operation.

Furthermore, with the German utility model 1 946 967 for a film camera magazine two on the spool cores with frictional pressure Acting ring-shaped damping brakes made of foam known, which are arranged on one side of the magazine housing coaxially to and directly above the coil cores. These damping brakes should prevent loose or irregular film flow by applying even pressure to the spool cores, and thus compensate for irregularities on the camera side. Such foam brake rings are for magnetic tape cassettes Cannot be used because much higher tape speeds have to be mastered and the friction torque on the cassette side not - as is necessary with film cameras - for generation

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of a volume must be increased. Also, when using disadvantage of the foam that it is not abrasion-resistant and therefore in magnetic tape cassettes in addition to recording and re-V "/" V. 1, V.,. -. ί ν. ..

shafts of the brake rings occurs. An improvement in storage the spool core is not intended with these damper brakes.

In the case of magnetic tape cansettes, guide means have been used for the Magnetic tape has proven to be extremely advantageous, for example with the German utility model 71 119 329 are described. Movable guide elements arranged in the immediate vicinity of the tape lap serve to guide the tape onto and from the tape roll, so that a flat roll formation is enforced and at the same time optimal tape alignment to the magnetic head is reached. To the effect of this well-known To improve tape guide means, storage means for the winding cores in magnetic tape cassettes are particularly necessary.

The invention is based on the object of developing storage means for winding cores in magnetic tape cassettes that exclusively serve to store the winding cores and should automatically correct non-regular movements of the winding cores, whereby the known storage means are improved and the same can be produced economically and for the series production of Cassettes should be suitable.

The task is with storage means for one or more winding cores in magnetic tape cassettes, especially in compact cassettes, with the winding cores between ring collars on the base and cover walls the cassette are stored and between the winding cores and the bottom and top walls bearing foils with groove-shaped Embossings are arranged, according to the invention achieved in that two opposing bearing foils each have at least one embossing have, which are arranged coaxially and symmetrically to and essentially exclusively over at least one of the winding cores are.

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With this arrangement according to the invention it is advantageously achieved that the winding cores in the axial direction in a predetermined manner and permanently elastically mounted and the necessary rsdisle mobility of the winding cores is reduced, whereby an additional braking torque is exerted on the winding cores.

Especially in the event of a sudden stop or change of direction of rotation the tape roll is made by the elastase according to the invention λ resilient bearing means the braking torque is effective on the winding cores, through which a loop formation in the cassette is prevented. Loops can be due to different moments of inertia of the tape winding or as a result of different braking torques on the drive side arise. The formation of loops leads to individual tape windings slipping off the tape roll, which usually leads to the inevitable seizing of the tape roll in the cassette, so that the cassette and magnetic tape are damaged and thus can become unusable.

In an advantageous embodiment, an approximately circular bearing film is tapered in cross section to the winding core surface over each winding core shaped embossing arranged.

Due to the essentially circular formations of the lag-successes, which are arranged directly above each winding core, it is ensured that only a storage of the Winding cores is achieved. Furthermore, compared to known storage foils, which have about the size of the cassette walls, A considerable saving in material is achieved, so that it is possible to use particularly high-quality film designs use.

In a further advantageous embodiment of the invention A plurality of embossings with essentially the same height are arranged above each winding core. That’s what makes it special easily possible, due to the number and shape of the embossments, any desired elasticity and spring effect and thus the additional Adjust the braking torque appropriately.

O. Z. 29 205

A particularly advantageous embodiment of the invention Storage means is seen in that two approximately circular storage foils are connected by a flat piece of foil.

Through this training, the assembly of the foils facilitated and the I'olienstück can optionally serve at the same time to cover a cassette window.

Details of the invention can be taken from the description with reference to the embodiments shown in the drawing.

FIG. 1 shows schematically a compact cassette with known tape guide levers and circular ones according to the invention Storage foils

FIG. 2 shows a section through one of the tape rolls; FIGS. 3a-e show cross-sectional shapes of the embossments

Figure 4 shows a section of a storage film with individual knob-like embossing and

FIG. 5 shows a section according to FIG. 4 with circular, roof-shaped embossments.

A compact cassette 1 is shown schematically and transparently with openings 2 and 3 for the entry of sound waves on the device side and pins and circular openings 4 in the base and cover walls 5 and 6 for the entry of device-side mandrels. On winding cores 7, a magnetic tape 8 is wound up into tape reels 9 and 10. From the tape wraps 9 and 10 is the tape 8 one guide lever 11 and one guide pulley 12 each guided parallel to the front 13 of the cassette. The guide levers 11 ensure that the tape runs up and down without any problems 8 safe, so that flat tape rolls 9 and 10 are obtained and a largely trouble-free tape and tape winding run is achieved will. Annular bearing foils H are arranged on both sides over the winding cores 7 and cover the winding cores 7. These foils H can also be angular. Possibly,

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to cover, for example, non-illustrated coffer windows, For example, two foils 14 arranged next to one another can also be provided by a pole piece 15 indicated by dashed lines in the drawing be connected. It is, of course, also possible to use the usual form of symbols. V / ie in Figure 2 is clearly visible, the foils 14 each have a circular shape Embossing 16 with an approximately sinusoidal cross-section, the outer ring edge of which just touches the winding core 7 approximately in the middle. The axial dimension of the embossing is approximately more than half the distance a between the walls 5 and 6 minus the thickness b of the Winding core 7. Due to this design, when using conventional, thin film material such as polyester, polyvinyl chloride, Polytetrafluoroethylene, the embossing 16 receives an elastic resilient characteristic, the spring force acting in a ring-like manner exclusively on the winding core 7. About the film thickness and elasticity and the shape of the embossments, the spring force can be adjusted to a suitable strength. The winding core 7 is thus more or less floating on the embossing and when rotating the tape roll can be in axial Direction occurring tumbling movements of the tape roll are compensated. A radial play that is necessary for the exact entry of the Winding mandrels in the openings 4 and the removal openings of the Winding cores 7 is necessary, is retained, but is through the embossing 16 slightly restricted. Thus, in a simple manner, there is an immediate compensation of wobble-like tape winding movements achieved, so that particularly advantageously obtained in connection with the guide levers 11, a flat ribbon winding formation and malfunctions due to the tape roll running up against the cassette walls, the tape slipping off the roll, looping and further disturbances of the tape run can be effectively prevented. In Figure 3a-e are some possible cross-sections of the Embossing 16 shown. In addition to the sinusoidal cross-sectional shape (Fig. 2) shows 3a) approximately semicircular shape, 3b) triangular shape and 3c) Trapezoidal shape, d) and e) show several adjacent embossings with approximately sinus or. triangular profile. Latter Designs limit the radial play particularly effectively. Fig. 4 shows a variant in which individual knob-like and roof-shaped Embossings 17 and 18 each circular with more or less space next to one another on a sector-shaped one

U.Z. 29 205

Foil pieces are formed. .All described and conceivable Embossing designs are thermal when using thermoplastic plastic films and, regardless of this, mechanical stampable. Metallized foils can also be used to further reduce the static charge.

The tapered formation of the Embossing or embossing causes the exertion of a slightly increasing spring force with increasing winding core deflection.

Fs are further versions of the bearing foils according to the invention conceivable, for which protection is also sought within the scope of the protection claims.

Claims (4)

- 7 - ο. Ζ. 29 20-3 Protection claims . Storage means for winding cores in magnetic tape cassette, especially in compact cassettes, with the winding cores being visually. Ring collars are stored on the base and cover walls of the cassette and between the winding cores and the base and leak! walls bearing foils are arranged with embossing, characterized in that two opposing bearing foils each have at least one embossing (16) which are approximately coaxial and symmetrical to and essentially exclusively but at least one of the winding cores (7). 2. Bearing means according to claim 1, characterized in that an approximately continuous circular, in cross section with tapered to the winding core surface shaped embossing (7) is arranged above each winding core (7). 3. Storage device according to claim 1, characterized in that a plurality of embossings with substantially the same height are arranged above each winding core (7). 4. Storage means according to claims 1, 2 or 3, characterized in that two approximately circular bearing foils (14) are connected by a flat piece of foil (15). Badische Anilin- & Soda-Pabrik AG drawing.