Dynamic magnetic information storage or retrieval – General recording or reproducing – Recording-or erasing-prevention
Patent
1975-04-15
1976-12-28
Lucas, Jay P.
Dynamic magnetic information storage or retrieval
General recording or reproducing
Recording-or erasing-prevention
360 96, G11B 1504
Patent
active
040005151
ABSTRACT:
Device for preventing the inadvertent erasure of a tape in a bi-directionally operable recording/reproducing apparatus for use with a tape cassette having a pair of detecting portions each provided with a removable lug and for the detection in the feeding of the tape in one direction and in the opposite direction, wherein the existence of the lug indicates that the erasure and recording of the tape are allowed while non-existence of the lug indicates that erasion of the tape is inhibited. The device has a pair of actuating levers urged to engage with the respective detecting portions so that each of the actuating levers is positioned in a first position when the detecting portion has a lug, whereas it is positioned in a second position when the detecting portion has no lug. A recording switching plate, which is adapted to be positioned in a first position when the tape is fed in one direction but positioned in a second position when the tape is fed in the opposite direction, is alternately engaged with the respective actuating levers so that either one of the actuating levers is urged to the first position so as to render the same inoperative in sensing the detecting portion which is not to be sensed depending upon the position of the recording switching plate which determines the direction of feeding of the tape. A recording preventing plate, which is coupled with a recording button of the recording/reproducing apparatus and positioned in a first position during a nonrecording operation but moved to a second position when the recording button is actuated for the recording operation, is provided with a pair of abutment portions each being adapted to engage with the respective actuating lever when the recording preventing plate is in its first position and either one of the actuating levers is positioned in the second position by sensing the detecting portion having no lug so as to arrest the recording preventing plate in its first position. Thus, the recording button is prevented from being actuated when the abutment portion of the recording preventing plate engages with the actuating lever positioned in the second position.
REFERENCES:
patent: 3586336 (1971-06-01), Rosenblatt
patent: 3677556 (1972-07-01), Oosone
patent: 3752938 (1973-08-01), Ozawa
patent: 3766327 (1973-10-01), Johnson
Copal Company Limited
Lucas Jay P.
LandOfFree
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