DE1996273U - TAPE CASSETTE - Google Patents

Description

RA.34539M5.S.8B

Badische Anilin- & Soda-Fabrik AG \ /

Our reference: G.M. 648 Ki / Stä 67OO Ludwigshafen, June 14th, 1968

Tape cassette

Tape cassettes consist of a flat plastic (polystyrene) housing Figure 1 (I) ₃ in which there are two winding cores (2). A tape (3), for example 3 * 8l mm wide, runs from one core to the other during operation or when rewinding. The clear space between the two cassette walls must be slightly larger than the tape width z = B = 5 mm. A sheet (4) is often inserted between the cassette walls and the rolls to prevent the roll from running up in the cassette . As is known, foils made of polytetrafluoroethylene, the surface of which is optionally graphitized, metallized polyvinyl chloride or also made of polyester are used as insert foils. These leaflets are now due to internal tensions in the film, slightly resilient on the V / l and thereby guide the tape as it is wound up. When using extremely thin tape material that has only a very low transverse rigidity, this additional tape guide must work very precisely in order to ensure safe operation of the cassette. Bai plan leaflets do not meet these requirements. But even with curved foils, the desired tape guidance is not always achieved, since the curvature is too undefined in terms of location and thickness. Furthermore, it can happen that the leaflet adheres to the cassette wall due to electrostatic charging

251/68 -2-

- 2 - G.M. 648

is pulled so that the desired resilient effect is canceled. In the case of cassettes that are equipped with such additional rolls and with extremely thin tapes, these tapes can slip off the roll and be pulled between the roll f and the wall of the cassette if handled improperly. |

It has been found that this disadvantage with tape cassettes,!

essentially consisting of a flat, two-part housing \ and two reel hubs accommodated therein for receiving the, tape winding, and one each between the winding cores and the; Covering foil arranged on the top and bottom, thereby preventing the insert foil from having radially outwardly extending round-shaped embossings over the wraps, the raised part of which is arranged in the direction of the tape roll.

In Figure 2 is an insert sheet according to the invention; illustrated in more detail.

With (4) the film is referred to, in which on the cores located on the winding points circular openings (5) are recessed . With (6) the groove-shaped depressions are illustrated, which extend radially outward from the recesses. The groove-shaped recesses expediently have a sinusoidal or semicircular cross-section. The depth of the grooves is expediently dimensioned so that the depths of both grooves together correspond at least to the clear space between the cassette walls and the tape. For example, the depth of the groove in a cassette with an inner distance of 5 is now between the cassette

-3-

-? - G.M. 648

Upper and lower wall, in which there is a 3.81 mm wide band, at least about 0 * 6 mm. As a result, the raised areas rest on the tape and ensure that the tape is guided precisely in the cassette. The depth of the embossed groove and the elasticity of the Polienmat-erials used are to be coordinated so that a safe
Guiding of the tape is achieved without an inadmissible increase in the friction between the roll and the insert film.

^ - The round-shaped embossing can easily be done at

Use of thermoplastics by thermal means can be produced by kiss embossing or can also be introduced mechanically. Can be used as material for the insert foils one uses in a known manner, for example, foils made of polyesters, polyvinyl chloride or polytetrafluorafchylene, the surfaces of which can be metallized in addition to the dissipation of electrostatic charges. Of course, metal foils can also be used be used,

Claims (1)

RA.345 391-1,5.6.88 - h - GM 648 \ l Claim to protection Tape cassette, essentially consisting of a flat, two-part housing and two winding cores accommodated in it for the reception of the tape winding and one insert foil each arranged between the winding cores and the top and bottom, characterized in that the insert foil over the windings radially outwards has running groove-shaped embossings, the raised part of which in the direction of the tape roll is arranged. Badische Anilin- & Soda-Fabrik AG Sign.