Dynamic magnetic information storage or retrieval – Record medium – In container
Patent
1993-11-17
1995-03-28
Wolff, John H.
Dynamic magnetic information storage or retrieval
Record medium
In container
2423452, G11B 2302
Patent
active
054022967
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a tape cassette, in particular a magnetic tape cassette, having a housing, comprising bottom and lid walls and housing back and front, and having at least one tape roll on an essentially flangeless hub onto which and/or from which a tape can be wound or unwound, support liners having curved or bent support liner regions which are co-ordinated with one another and are opposite one another in relation to the central plane of the cassette and exert spring force on the tape roll or rolls being provided between the tape roll having tape windings and the bottom and lid walls of the cassette, and the support liners having, in the central region, longitudinal bends which on the one hand are partially supported on the bottom or lid surfaces and have bend parts which point toward the tape roll and exert spring forces at least on the hub and/or tape roll, and suitably formed support liners for such tape cassettes.
Flat support liners having rigidly constrained longitudinal beads, with bead heights of from 0.28 to 0.53 mm for compact cassettes having an axial free space of about one (1 mm) to about one point two millimeters (1.2 mm), are disclosed, for example in German Patent 2,825,457. The longitudinal beads of the support liners are intended to face the tape rolls and hubs. If the bead heights are at the lower limit of the abovementioned height range (e.g. 0.2-0.3 mm), the support liners act like rigid support sheets between the tape roll and the housing walls since there is no springiness. In its height, the tape roll therefore attempts to occupy the full axial free space available between the support liners which rest against the housing walls. If the bead heights are at the upper limit of the abovementioned range (e.g. 0.4-0.5 mm), the torque of the cassette increases, leading very easily to difficult running of the cassette or to jamming of the tape roll or rolls in the housing.
German Utility Model 8,606,119 furthermore discloses two-bend support liners for compact cassettes, whose longitudinal bend edges face the tape rolls and whose longitudinal support liner edges, which are bent upward or downward with respect to the central plane of the liner, are supported on the inside of the lid wall or the bottom wall of the cassette. The support liners are thus held by means of spring forces between the housing and the tape rolls. The spring characteristic is relatively flat and linear, giving a small spring constant. If the weight of the full tape roll presses on one of the support liners, there is contact between the tape roll and the support liner over a large area, the springiness of the support liner being insufficient to keep the tape roll a distance away from the support liner or from the housing wall. During playback of the cassette in the recorder, the contact over a large area produces electrostatic charges between the support liner, the cassette housing and the magnetic tape, in particular if the magnetic tape has high surface resistance, with the result that the torque of the cassette increases considerably and finally even blocks the cassette.
It is an object of the present invention to equip a cassette with support liners which ensure reliable tape roll and tape guidance, in particular in the tape run-in and run-out region on the tape roll, in combination with the permissible torque, and to provide suitable support liners themselves.
We have found that this object is achieved by a tape cassette, in particular a magnetic tape cassette, having a housing, comprising bottom and lid walls and housing back and front, and having at least one tape roll on an essentially flangeless hub onto which and/or from which a tape can be wound or unwound, support liners having curved or bent liner regions which are coordinated with one another and are opposite one another in relation to the central plane of the cassette and exert spring force on the tape roll or rolls being provided between the tape roll having tape windings and the bottom and lid walls of the cassette, and the support lin
REFERENCES:
patent: 3942744 (1976-03-01), Fitterer et al.
patent: 3977626 (1976-08-01), Gaiser et al.
patent: 4191984 (1980-03-01), Tsukidate et al.
patent: 4516181 (1985-05-01), Shirako
patent: 4624423 (1986-11-01), Schoettle et al.
patent: 4632334 (1986-12-01), Schaeffer et al.
patent: 4681280 (1987-07-01), Duurland et al.
patent: 4709290 (1987-11-01), Schoettle et al.
patent: 4881146 (1989-11-01), Bordignon
patent: 4882645 (1989-11-01), Bordignon
Gliniorz Lothar
Huck Arno
Manzke Klaus
Schaeffer Norbert
Schoettle Klaus
BASF - Aktiengesellschaft
Wolff John H.
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