Winding – tensioning – or guiding – Unwinding and rewinding a machine convertible information... – Cartridge system
Patent
1997-12-03
2000-03-14
Walsh, Donald P.
Winding, tensioning, or guiding
Unwinding and rewinding a machine convertible information...
Cartridge system
2423381, 2423551, 360 94, 360 963, G03B 2302
Patent
active
06036131&
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention generally relates, although not exclusively limited thereto, to a magnetic tape recording and/or reproducing apparatus such as, for example, a video tape recorder and, more particularly, to a reel braking mechanism employed in the video tape recorder for braking at least one of supply and take-up reels in order to avoid slackening of a length of magnetic recording tape that extends between two hubs within a magnetic tape cassette mounted in the video tape recorder.
2. Background Art
The video tape recorder capable of accommodating magnetic tape cassettes of different sizes selectively one at a time has been known in the art. By way of example, VHS-ready video tape cassettes now in the market are available in two types, standard and compact, which have different cassette sizes from each other. The standard video tape cassettes are rather prominently used in home video tape recorders which are coupled with television receiver sets and the compact video tape cassettes are mainly used in compact and portable video cameras. Regardless of the size of the cassette, both use magnetic recording tape which has the same tape width and are compatible with each other so far as information recording and reproducing schemes are concerned.
When it comes to recording or reproducing information on or from the magnetic recording tape within the compact video tape cassette through the home video tape recorder, a cassette adaptor of a size and shape both resembling those of the standard video tape cassette has been needed.
However, in order for the compact video tape cassette to be utilizable in the home video tape recorder without needing to use the cassette adaptor, a video tape recorder has been suggested in which when the compact video tape cassette is loaded in the video tape recorder, supply and take-up reels then spaced from each other a distance corresponding to the hub-to-hub distance of the standard video tape cassette can be driven to a position where the reel-to-reel distance attains a value corresponding to the hub-to-hub distance of the compact video tape cassette. An example of the suggested video tape recorder of the type having a capability of adjusting the reel-to-reel distance is shown in FIGS. 13 and 14.
In the video tape recorder of the known type shown in FIGS. 13 and 14, the supply and take-up reels are simultaneously movable between standard and compact cassette positions. The supply and take-up reels are movable along respective straight paths extending at an angle relative to each other so as to converge at a point away from the imaginary line connecting between respective axes of rotation of the supply and take-up reels. Since in this example the supply and take-up reels are rotatably supported in the same manner, reference will be made only to one of them, for example, the supply reel, and its associated parts.
Referring to FIGS. 13 and 14, a supply reel 110 is integrally formed with a reel spindle 110a and is engageable with any one of the hubs in any one of the standard and compact video tape cassettes. This supply reel 110 is rotatably mounted on a reel base 108 through a support shaft 109. Although not shown, the support shaft 109 is in turn drivingly coupled with a drive motor disposed beneath the reel base 108, either directly or through a drive transmission mechanism. The reel base 108 is movably mounted on a guide rail mechanism including two parallel guide rods 107 fixed at opposite ends thereof to a chassis of the video tape recorder and, therefore, the supply reel 110 is movable between the standard and compact cassette positions along the parallel guide rods 107.
In order to permit information to be recorded or reproduced on or from a length of magnetic recording tape in a stable fashion regardless of whether the tape cassette mounted is a standard video tape cassette or whether it is a compact video tape cassette, a reeled length of magnetic recording tape must be held still without being loosened within the vi
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Matsushita Electric - Industrial Co., Ltd.
Pham Minh-Chau
Walsh Donald P.
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