Winding – tensioning – or guiding – Strand tensioning device – Tortuous course
Patent
1981-04-10
1983-09-20
Christian, Leonard D.
Winding, tensioning, or guiding
Strand tensioning device
Tortuous course
360132, G03B 104, G11B 1532
Patent
active
044050968
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a magnetic tape cassette according to the preamble of Patent claim 1.
When known magnetic tape cassettes of this type are used in conjunction with appropriate recording and playback equipment, it is often desired to play back a certain section of the magnetic tape, containing a recording, several times in succession. This is the case particularly during the use of magnetic tape cassettes which contain language lessons which are to be impressed on the memory sectionally by repeated playback. In this mode of use, it is thus necessary, after the particular section of magnetic tape has been played back, to wind the magnetic tape back to the start of the section.
In order to avoid a laborious and time-consuming search, by alternate re-wind and playback, for rapidly locating the start of the section of magnetic tape which is to be played back repeatedly, recording and playback equipment is known which has a so-called "memory" device. These are devices which, for example in conjunction with a tape-length counter or with means for applying control signals to the magnetic tape, stop the transport of the magnetic tape during re-wind at a previously set point of the magnetic tape, compare, for example, U.S. Pat. No. 3,601,555.
From U.S. Pat. No. 3,810,246, it is known to provide one or both edges of the magnetic tape with visually discernible markings which, for example, designate pauses between recorded program sections and which are visible through the window of the magnetic tape cassette. Moreover, it is known from British Pat. No. 1,040,262, to provide the magnetic tape, at certain points, with permanent thickenings, for example strips which are glued on, which can be sensed by means of an instrument for measuring the tape thickness, for example a roll, in order to switch the equipment over when such a thickening is detected.
It is the object of the present invention to provide a device for the automatic location of a defined point, which can be selected as desired and can be shifted, on the magnetic tape when the latter is re-wound, which device is independent of the design of the recording and playback equipment used. It is a further object of the invention to construct such a device in a magnetic tape cassette in such a way that the operation of the device is simple and reliable, that the magnetic tape cassette meets the existing standards with respect to its dimensions and operational specifications and contains a conventional unchanged magnetic tape, and the production costs of the magnetic tape cassette substantially correspond to those of hitherto known and customary magnetic tape cassettes.
To achieve this object, the magnetic tape cassette according to the invention has the features indicated in the characterising clause of Patent claim 1.
According to one embodiment of the invention, the stops can be rigidly joined to the shells, each control element being a control slide which comprises a grip portion, projecting outwards through an aperture in the shell concerned, and two cheeks which project into the interior of the housing and between which the magnetic tape runs, it being possible to move the magnetic tape out of the zone of the stops by actuating the control slide.
Conversely, each control element can either be a control lever rotatably mounted in the shells or a control slide displaceably mounted between the shells, which lever or slide comprises the two stops for the tape clamp, a grip zone which is accessible from outside the housing, and a surface zone, arranged opposite the guide element for the magnetic tape, for clamping in and compressing the tape clamp.
Illustrative embodiments of the magnetic tape cassette according to the invention and its mode of functioning are explained in the following text by reference to the drawings in which:
FIG. 1 shows a plan view of a magnetic tape cassette in a first embodiment,
FIG. 2 shows a plan view of the interior of the magnetic tape cassette of FIG. 1,
FIG. 3 shows a perspective view, on a larger scale, of a tape clamp of the
REFERENCES:
patent: 3501103 (1970-03-01), Kelley
patent: 3512732 (1970-05-01), Walsh
patent: 3589734 (1971-06-01), Pastor
patent: 3601555 (1971-08-01), Peterson
patent: 3810246 (1974-05-01), Stone, Jr. et al.
Christian Leonard D.
Wyder AG.
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