Winding – tensioning – or guiding – Unwinding and rewinding a machine convertible information... – Cartridge system
Patent
1997-07-28
1999-03-30
Darling, John P.
Winding, tensioning, or guiding
Unwinding and rewinding a machine convertible information...
Cartridge system
242356, G11B 1500
Patent
active
058878122
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND
The invention relates to a cassette recorder which can selectively receive cassettes of various sizes, in which the distance between the winding plates receiving the reels of tape is variable. Such a recorder is known, cf. SMPTE Journal, August 1989, pages 568 to 574.
For selectively receiving cassettes of various sizes or various types of cassette containing a recording medium in tape form, a distance adjustment of the winding plates is provided in the known cassette recorder. The selective driving of the winding-up plate, for example during recording or reproduction of signals, or of the unwinding plate, for example during rewind operation of the device, is performed in each case by a winding plate motor driving the respective winding plate directly.
The invention is based on the object of providing an inexpensive adjustable winding drive.
This object is achieved by the invention specified in claims 1 and 15. Advantageous developments of the invention are specified in the subclaims.
SUMMARY OF THE INVENTION
For the purpose of adapting the distance between the winding plates to the respective rolls of tape of the respective type of cassette, the invention is based on the idea of arranging the two winding plates such that they can swivel about a respective spindle, fixed relative to the drive chassis of the cassette recorder, and, depending on the intended tape-winding direction, of driving the respective winding plate, in engagement with a roll of tape, via a slip clutch.
Such a slip clutch can be realized in a simple way, for example by clutch wheels arranged rotatably on the respective winding-plate swivel spindle. The respective clutch wheels may in this case form part of the gear mechanism between the respective drawing winding plate and a drive motor, or else also act or be used with their clutch Lining as a winding-plate brake.
With such stationary slip clutches, known per se, there is also associated the advantage that, if using a swivel gear mechanism, likewise known per se, having a stationary central wheel and a swivel wheel which can be swivelled about the central wheel spindle and, depending on the intended tape-winding direction, automatically comes into engagement with the one or the other slip clutch, or can be swivelled up against one of the clutch wheels of the respective slip clutch, only one motor is required for the driving of the two winding plates.
It is also conceivable to provide one central clutch instead of the two slip clutches. Such a clutch can be realized in an advantageous way by the swivel gear mechanism.
BRIEF DESCRIPTION OF THE DRAWINGS
A cassette recorder according to the invention is explained below with reference to the drawings, in which:
FIG. 1 shows the drive side of a small type of cassette, by which the winding plate spindles arranged rotatably on a drive chassis come into engagement with the rolls of tape of the cassette.
FIG. 2 shows a sectional representation of the cassette according to FIG. 1,
FIG. 3 shows the drive side of the standard type of cassette,
FIG. 4 shows a sectional representation of the standard cassette according to FIG. 3,
FIG. 5 shows, in a plan view of the drive mechanism, an adjustable winding-plate drive,
FIG. 6 shows, in a plan view, the tape-winding plates in the operating position intended for the standard type of cassette,
FIG. 7 shows, in a plan view, the tape-winding plates in the operating position intended for the small type of cassette,
FIG. 8 shows in a sectional representation, in the region on the unwinding plate side, the slip clutch in engagement with the unwinding plate in the operating position intended for the small type of cassette,
FIG. 9 shows, in a sectional representation, a second exemplary embodiment with a swivel gear mechanism which has a central clutch and is in engagement, via a stationary intermediate wheel, with the swivelling tape-winding plate on the unwinding plate side,
FIG. 10 shows a further sectional representation of the second exemplary embodiment according to FIG. 9.
DESCRIPTION O
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Lauble Erhard
Weisser Fritz
Darling John P.
Deutsche Thomson-Brandt GmbH
Tripoli Joseph S.
Wein Frederick A.
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