Dynamic magnetic information storage or retrieval – Record transport with head moving during transducing – Tape record
Patent
1986-09-12
1988-06-28
Tupper, Robert S.
Dynamic magnetic information storage or retrieval
Record transport with head moving during transducing
Tape record
360 95, G11B 15665
Patent
active
047543477
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to magnetic tape reel mounts in a video tape recorder, hereinafter referred to as a "VTR", and more particularly, to a brake mechanism for reel mounts in a VTR in which a tape is pulled out and stored by stopping a take-up reel mount and by rotating a supply reel mount at the time of loading and unloading.
2. Description of the Prior Art
A conventional tape-loading mechanism for a VTR is disclosed in U.S. Pat. Nos. 4,115,825 and 4,426,668. In this type of mechanism for a VTR, it is desirable that the tape position be the same when the tape is reloaded for playing and recording as the position of the tape when it was previously unloaded. The reason for this is to make the last picture in the first playing operation and the initial picture in the second playing operation continuous and also to maintain the indication of a tape counter consistent.
Conventionally, to accomplish these purposes, only one of the supply and take-up reel mounts is braked and the other is rotated, whereby loading and unloading of the magnetic tape are accomplished.
Also, in the conventional VTR, the brakes are applied to both of the reel mounts at the time of stopping so as to prevent the tape from slackening, and are relased at the time of playing.
Conventional brake mechanisms have required the use of two brake systems, and this has caused complication of the mechanism.
SUMMARY OF THE INVENTION
The present invention was developed taking the above-mentioned problems into consideration. The object of the present invention is to provide a single brake mechanism which operates on both the supply and the take-up reel mounts simultaneously, which is of simple construction and which includes a one-way clutch by which the tape position doesn't change notwithstanding repeated loadings and unloadings. The object of the present invention is also to provide a brake mechanism for magnetic tape reel mounts of simple construction in which an idler wheel is brought into engagement with the reel mounts in a wedged fashion in the rotary direction of the reel mounts, whereby the reel mounts can be braked by the wedging action of the idler wheel.
The present invention provides a brake mechanism for magnetic tape reel mounts in a VTR of the type that receives magnetic tape stored on two reels rotatably mounted internally of a cassette which includes a tape supply reel mount and a take-up reel mount, each of the reel mounts including an idler engagement and a brake engagement portion, an idler wheel mounted for movement into engagement with either of the idler engagement portions of the tape reel mounts, means driving the idler wheel for selective rotation in opposite directions and a pair of brake means for simultaneously engaging and disengaging with the brake engagement portions of the tape reel mounts. A one-way clutch is provided to connect the idler engaging portion and the brake engaging portion of the tape supply reel mount and is operative to drivingly engage the idler engagement portion and the brake engagement portion only when the idler engagement portion rotates in one direction and permits the idler engagement portion of the tape supply reel mount to rotate independently of the brake engagement portion when the idler engagement portion rotates opposite to that one direction. Loading means are provided in the VTR for pulling the magnetic tape out of the cassette and disposing the tape in contact with a guide cylinder. At the time of unloading, the pair of brake means are actuated to engage the brake engagement portions of the supply and take-up reel mounts and the idler wheel engages the idler engagement portion of the tape supply reel mount and rotates that idler engagement portion to withdraw the magnetic tape from the guide cylinder by rewinding the magnetic tape on the tape supply reel mount.
Moreover, the brake mechanism of the present invention also includes means for wedging the idler wheel with the idler engagement of the tape take-up reel mount
REFERENCES:
patent: 4573090 (1986-02-01), Tsuchiya
patent: 4635146 (1987-01-01), Koda et al.
patent: 4652948 (1987-03-01), Umeda
patent: 4661864 (1987-04-01), Kuwajima
patent: 4663681 (1987-05-01), Kodama
Sanyo Electric Co,. Ltd.
Tupper Robert S.
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