Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Tape record
Patent
1989-09-06
1991-07-23
Wolff, John H.
Dynamic magnetic information storage or retrieval
Record transport with head stationary during transducing
Tape record
360 93, G11B 5008, G11B 15675
Patent
active
050348345
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a cassette loading apparatus for use in a magnetic tape recording/reproducing apparatus, for example, and more particularly, to a front loading apparatus for loading a cassette from the front side of a video tape recorder (hereinafter referred to as VTR).
BACKGROUND ART
Recently, home VTRs use a front operational type cassette loading apparatus which loads (inserts) a cassette into a VTR at a predetermined position (where a tape is pulled out from the cassette) from the front side for tape recording/reproducing, and unloads (ejects) the cassette to the front side of the VTR after its use is finished.
Conventionally, this type of front loading apparatus (hereinafter referred to as FL) generally has a power mechanism coupled to a cassette holder for receiving a horizontally loaded cassette. In this case a drive gear is disposed on one side of the cassette holder and a driven gear on the other side. That is, the driven gear interlocks with the drive gear via a transmission mechanism.
Due to the backlash inevitable to a mechanism using gears, however, the above conventional FL causes a phase shift in view of the operational time between the drive gear and driven gear located at both ends of the cassette holder, at the times of cassette loading and unloading. This deviates the parallelism between the right and left edges of the cassette during operation, so that smooth loading and unloading cannot be provided.
DISCLOSURE OF THE INVENTION
This invention has been devised to cope with such problem, and aims at providing an FL type cassette loading apparatus which can eliminate a operational phase shift between a cassette holder and the right and left edges of a cassette at the time of loading and unloading the cassette to thereby keep the right and left sides of both the cassette holder and cassette parallel over the entire operational process.
To achieve the above objective, in a front type cassette loading apparatus comprising a cassette holder for holding a cassette horizontally, drive posts secured symmetrical at both sides of the cassette holder, a pair of arm gears with arm levers having slide grooves formed therein for engagement with the drive posts, an interlocking mechanism for interlocking the arm gears, a drive source for rotationally driving one of the arm gears and a pair of frames, having guide grooves formed therein for engagement with the pair of drive posts, the width of the slide groove formed in that of the pair of arm levers which is located on the drive side is set greater than the width of the slide groove formed in the arm lever on the driven side.
BRIEF DESCRIPTION OF THE DRAWINGS
The aforementioned object of this invention and other objects and features will become apparent in the following description of some embodiments given referring to the accompanying drawings in which:
FIGS. 1 through 9 illustrate the basic example of a cassette loading apparatus according to this invention, FIG. 1 being an external perspective view of a front loading apparatus,
FIGS. 2 to 5 being a top view, a right side view, a left side view and a front view, respectively, FIGS. 6 and 7 being diagrams, with the essential section taken from the right side view of FIG. 3 and simplified, for easy explanation of the operation, and
FIGS. 8 and 9 being diagrams, with the essential sections taken from the right side view of FIG. 3 and the left side view of FIG. 4 and simplified, for easy explanation of the operation;
FIGS. 10 and 11 are side views illustrating the drive side and driven side of a cassette loading apparatus according to one embodiment of this invention;
FIG. 12 is a diagram illustrating the operation of the same embodiment;
FIGS. 13 and 14 are plan views illustrating slide grooves according to other embodiments of this invention; and
FIGS. 15 and 16 are detailed diagrams of the essential sections of FIGS. 10 and 11.
BEST MODE OF CARRYING OUT THE INVENTION
First, a description will be given of the basic example of an FL type cassette loading ap
REFERENCES:
patent: 4628382 (1986-12-01), Okumura
patent: 4831472 (1989-05-01), Ando et al.
Evans Jefferson
Kabushiki Kaisha Toshiba
Toshiba Audio-Video Engineering Co.
Wolff John H.
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