Dynamic magnetic information storage or retrieval – Record transport with head moving during transducing – Tape record
Patent
1988-10-25
1990-12-04
Tupper, Robert S.
Dynamic magnetic information storage or retrieval
Record transport with head moving during transducing
Tape record
G11B 15665
Patent
active
049757938
DESCRIPTION:
BRIEF SUMMARY
FIELD OF TECHNOLOGY
The present invention relates to a tape loading mechanism in a magnetic recording and/or reproducing apparatus for causing a length of magnetic tape to travel along a rotary head drum.
BACKGROUND ART
FIG. 1 is a structural diagram showing one example of the prior art tape loading mechanism. In this figure, reference numeral 1 represents a chassis, reference numeral 2 represents a rotary head drum, and reference numeral 3 represents a tape cassette accommodated in the chassis 1 having a supply reel 24 from which the length of magnetic tape 4 is drawn so as to be turned around the rotary head drum and as to be wound around a tape-up reel 23. Reference numerals 25 and 26 represent respective guide rods disposed inside the tape cassette 3. Reference numerals 5 and 6 represent respective guide grooves formed one on each side in the chassis 1, reference numerals 7 and 8 represent respective guide post member slidably supported in the associated guide grooves 5 and 6, reference numerals 9 and 10 represent respective guide stopper rigidly mounted on the chassis 1 for receiving the associated guide post members 7 and 8 during a loading condition, and reference numeral 11 represents a capstan drive motor for driving a capstan shaft 12. Reference numeral 13 represents a pinch roller support arm pivotally mounted on the chassis 1 through a support pin 14 rigidly mounted upright on the chassis 1, said pinch roller support arm having a free end carrying a pinch roller 15 rotatably mounted thereon.
The pinch roller support arm 13 and a driving means therefor are illustrated in FIG. 2. Reference numeral 16 represents a cam plate pivotally mounted on a support shaft of the pinch roller 15 and having a generally intermediate portion thereof provided with a tape guide 17. This cam plate 16 is normally biased in a counterclockwise direction, as viewed in FIG. 2, by a spring member (not shown) and is, so far illustrated, so biased that a free end of the cam plate 16 is engaged to an abutment member 22. When the pinch roller support arm 13 is pivoted in a counterclockwise direction, the cam plate 16 is so pivoted with its free end disengaged from the abutment member 22 and subsequently engaged to a stopper 13a provided on the pinch roller support arm 13. Reference numeral 18 represents a link plate supported for sliding movement in one of the opposite directions, shown by the arrows A and B, while guide by support pins 26 rigidly mounted on the chassis 1 so as to protrude upright from the chassis 1, which link plate 18 can be moved by a loading drive motor through a motion transmitting means (both not shown). Reference numeral 19 represents a slide plate supported slidably on the link plate 18, which plate 19 is normally urged in a direction shown by the arrow A by the action of a tension spring 20 disposed between it and the link plate 18 and is formed with a slot 19a. An engagement pin 21 rigidly secured to a rear end of the pinch roller support arm 13 is engaged in the slot 19a and is operable to rotate the pinch roller support arm 13 when the slide plate 18 is moved.
The operation of the prior art device of the above described construction is as follows. The tape cassette 3 having the length of magnetic tape 4 accommodated therein is placed on the chassis 1. While in this unloading condition, the loading drive motor is driven to move the guide post members 7 and 8 along the guide grooves 5 and 6, respectively, through the motion transmitting means (not shown) to establish a first loading condition.
On the other hand, during the unloading condition, the pinch roller support arm 13 is in a pivoted position shown by the chain line by the action of the link plate 18 held at a position biased in the direction shown by the arrow B in FIG. 2 and, therefore, the cam plate 16 is engaged to the stopper 13a. By the rotation of the loading drive motor for the loading, the link plate 18 is moved in the direction shown by the arrow A through the motion transmitting means (not shown). In this way, the pinch roller
REFERENCES:
patent: 4807065 (1989-02-01), Kwon
Mitsubishi Denki & Kabushiki Kaisha
Tupper Robert S.
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