US3752938A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic recording and reproducing apparatus having electrical switching interlocked with mechanical controls to sense the presence or absence of a cartridge tab
Assignee: Sony Corp
•
Filing: 1971-07-29
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Granted: 1973-08-14
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Expires: 1991-07-29
Abstract
Abstract A cassette recorder/reproducer having a feeler to determine the presence or absence of a tab indicating permanent recording and means to deactivate the feeler when using a teaching cassette having one track of prerecorded teaching material and a second track on which the student may record and later play back his own material. The switching means also allows the magnetic head that operates on the teacher''s track to be used either as a playback or recording head for cassettes other than instructional ones. The switching means are controlled by apparatus actuated when a cassette is removed at which time the circuits are automatically switched for non-instructional use and must be deliberately set for instructional use if that is desired.
Inventors
- 👤 Y Ozawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:03
CPC Classifications
G; G09; G09B; G09B5/00; G09B5/04; G11; G11B; G11B15/00; G11B15/02; G11B15/05; G11B15/06
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
259 words
In a magnetic recording and reproducing device for use with a magnetic tape cassette having removable tab means at a predetermined location on the cassette to indicate by its absence or presence whether information recorded on the tape in said cassette is permanent or can be erased, the combination of: A. Magnetic head means operative selectively to record signals on the tape in a cassette at an operative position on the device or to reproduce signals previously recorded on such tape; B. Feeler means operative for detecting the presence or absence of said tab means on a cassette at said operative position; C. Means to prevent the selective operation of said magnetic head means for recording signals on the tape in response to the detection by said feeler means of said absence of the tab means from a cassette at said operative position; D. Blocking means movable in one direction for blocking said detection by said feeler means of the absence of the tab means on a cassette so that said magnetic head means is then selectively operable to record or reproduce signals on the tape in such cassette irrespective of the presence or absence of the tab means thereon; E. Ejecting means operative for ejecting a cassette from said operative position; and F. Means moving said blocking means in the opposite direction in response to the operation of said ejecting means for permitting said feeler means to detect the presence or absence of the tab means on a cassette subsequently disposed at said operative position on the device.
Claim 2
Dependent Claim
259 words
In a magnetic recording and reproducing device for use with a magnetic tape cassette having removable tab means at a predetermined location on the cassette to indicate by its absence or presence whether information recorded on the tape in said cassette is permanent or can be erased, the combination of: A. Magnetic head means operative selectively to record signals on the tape in a cassette at an operative position on the device or to reproduce signals previously recorded on such tape; B. Feeler means operative for detecting the presence or absence of said tab means on a cassette at said operative position; C. Means to prevent the selective operation of said magnetic head means for recording signals on the tape in response to the detection by said feeler means of said absence of the tab means from a cassette at said operative position; D. Blocking means movable in one direction for blocking said detection by said feeler means of the absence of the tab means on a cassette so that said magnetic head means is then selectively operable to record or reproduce signals on the tape in such cassette irrespective of the presence or absence of the tab means thereon; E. Ejecting means operative for ejecting a cassette from said operative position; and F. Means moving said blocking means in the opposite direction in response to the operation of said ejecting means for permitting said feeler means to detect the presence or absence of the tab means on a cassette subsequently disposed at said operative position on the device.
Claim 3
Dependent Claim
55 words
The device as set forth in claim 1; further comprising amplifying means, and switching means connecting said amplifying means and said magnetic head means and being actuated from said ejecting means upon operation of the latter to return to a predetermined condition each time a cassette is ejected from said operative position on said device.
Claim 4
Dependent Claim
86 words
The device as set forth in claim 2 in which said amplifying means has an input circuit and an output circuit, said magnetic head means comprises first and second magnetic heads, and said switching means includes means to connect said first head alternatively to said input circuit of said amplifyting means or to said output circuit of said Ampliying means or to connect said first head to said input circuit while said second head is connected either to said input circuit or to said output circuit.
Claim 5
Dependent Claim
104 words
The device as set forth in claim 1; in which said feeler means includes a feeler element movably mounted adjacent the location of the tab means on a cassette when the latter is in said operative position and resilient means urging said feeler element to move in the direction toward said location so that the presence of said tab means on the cassette limits the movement of said feeler element in said direction; and in which said blocking means, when moved in said one direction, engages said feeler element to block said movement thereof in said direction toward the location of the tab means.
Claim 6
Dependent Claim
106 words
The device as set forth in claim 1; futher comprising amplifying means having an input circuit and an output circuit, and in which said means to prevent the selective operation of said magnetic head means includes: A. Switching means to connect said output circuit of the amplifying means to said magnetic head means; B. Manually operable means to control said switching means; and C. Interlock means connecting said manually operable means to said feeler means to permit said manually operable means to be operated only when said feeler means detects the presence of the tab means on a cassette at said operative position on the device.
Claim 7
Dependent Claim
74 words
The device as set forth in claim 5, in which said interlock means comprises a sliding member engaging said manually operable means to be moved thereby in a predetermined direction, and said feeler means includes a rod slidable in a direction transverse to said sliding member and into the path of said sliding member when said tab means is absent, whereby said manually operated means cannot be operated when said tab means is absent.
Claim 8
Dependent Claim
139 words
The device as set forth in claim 1, in which said magnetic head means includes first and second magnetic heads, and said device further comprises: A. Amplifying means having an input circuit and an output circuit; B. A first multi-pole switch actuable between a recording position and a playback position; and C. A second multi-pole swtich actuable between a first condition and a second condition, said switches being interconnected with each other and with said amplifying means and said first and second magnetic heads whereby, when said second switch is actuated to said first condition, said first magnetic head is connected to said input circuit of said amplifying means and said second magnetic head is connectable by said first switching means either to said input circuit of said amplifying means or to said output circuit of the amplifying means.
Claim 9
Dependent Claim
49 words
The device as set forth in claim 7 in which said second switching means comprises connections such that when said second switching means is in said second condition said first magnetic head is switchable either to said input circuit or to said output circuit by said first switching means.
Claim 10
Dependent Claim
62 words
The device as set forth in claim 8, in which said blocking means comprises sliding means engaging said second switch to actuate the same, and a handle coupled with said sliding means to move said sliding means in said one direction to a first position and in said opposite direction to a second position corresponding, respectively, to said first and second conditions.
Claim 11
Dependent Claim
41 words
The device as set forth in claim 9 comprising, in addition: A. A cover for said operative position; B. Pivotal mounting means for said cover; and C. Means rigidly engaged with said pivotal mounting means and engageable with said sliding member.
Claim 12
Dependent Claim
66 words
The device as set forth in claim 9 comprising, in addition, a bell crank lever engageable with said sliding member and resiliently urged thereagainst and having an arm extendable into contact with a cassette in said operative position on the device, said lever pivoting when said cassette is ejected, thereby to force said sliding member into pOsition to place said second switch in said second condition.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |