US4272792A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mode changing system for a cassette tape recorder
Assignee: Nakamichi Corp
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Filing: 1979-06-25
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Granted: 1981-06-09
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Expires: 1999-06-25
Abstract
Abstract This invention relates to a mode changing system for a cassette tape recorder in which operating members such as a head base plate and a pinch roller are selectively moved to one of various modes such as stopping, fast forwarding, rewinding, pausing, cueing and playing. This system comprises control means to control the movable components so as to move them to a position corresponding to a selected one of the modes. The control means is actuated by a control electric motor. The system further comprises a mode selective switch group to select one of the modes, a reference signal generating circuit to generate a reference signal corresponding to the selected one of the modes in accordance with the selection of the modes by means of the mode selective switch group, a variable signal generating circuit to generate a variable signal which continuously varies with the rotation of the control electric motor and an operational circuit to receive both of the reference and variable signals so as to rotate the control electric motor for moving the movable components toward the position corresponding to the selected mode.
Inventors
- 👤 Niro Nakamichi
- 👤 Kozo Kobayashi
- 👤 Hideo Kawachi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:16
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/02; G11B15/10; G11B15/103; G11B15/18; G11B15/1883
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
236 words
A mode changing system for a cassette tape recorder wherein operating members such as a head base plate and a pinch roller are moved in accordance with operating modes of said cassette tape recorder comprising: control means to control movement of the operating members to take a position corresponding to a selected mode of said cassette tape recorder; a control electric motor to actuate said control means; a mode selective switch group to select one of said modes; a reference signal generating circuit to generate a reference signal corresponding to the selected one of said modes in accordance with the selection of said modes by means of said mode selective switch group; a variable signal generating circuit to generate a variable signal which continuously varies with the rotation of said control electric motor; and an operational circuit to receive said reference signal at one of its inputs and said variable signal at the other input to compare said signals to generate a control output so as to rotate said control electric motor, said operational circuit being associated with said control means and said variable signal generating circuit so that said control output is generated for rotating said control electric motor when said operating members are at a position different from the position corresponding to the selected mode and for stopping said control electric motor when said operating members reach the position corresponding to the selected mode.
Claim 2
Dependent Claim
236 words
A mode changing system for a cassette tape recorder wherein operating members such as a head base plate and a pinch roller are moved in accordance with operating modes of said cassette tape recorder comprising: control means to control movement of the operating members to take a position corresponding to a selected mode of said cassette tape recorder; a control electric motor to actuate said control means; a mode selective switch group to select one of said modes; a reference signal generating circuit to generate a reference signal corresponding to the selected one of said modes in accordance with the selection of said modes by means of said mode selective switch group; a variable signal generating circuit to generate a variable signal which continuously varies with the rotation of said control electric motor; and an operational circuit to receive said reference signal at one of its inputs and said variable signal at the other input to compare said signals to generate a control output so as to rotate said control electric motor, said operational circuit being associated with said control means and said variable signal generating circuit so that said control output is generated for rotating said control electric motor when said operating members are at a position different from the position corresponding to the selected mode and for stopping said control electric motor when said operating members reach the position corresponding to the selected mode.
Claim 3
Dependent Claim
34 words
A mode changing system for a cassette tape recorder as set forth in claim 1, said reference signal generating circuit generating a reference voltage and said variable signal generating circuit generating a variable voltage.
Claim 4
Dependent Claim
73 words
A mode changing system for a cassette tape recorder as set forth in claim 2, said operational circuit generating such a control output that said control electric motor is rotated in a direction in which the level of said variable voltage varies toward the level of said reference voltage and that said control electric motor is stopped when the level of said variable voltage becomes equal to the level of said reference voltage.
Claim 5
Dependent Claim
37 words
A mode changing system for a cassette tape recorder as set forth in claim 1, wherein said control means comprises cam means to move said operating members in accordance with the rotation of said control electric motor.
Claim 6
Dependent Claim
34 words
A mode changing system for a cassette tape recorder as set forth in claim 4, said reference signal generating circuit generating a reference voltage and said variable signal generating circuit generating a variable voltage.
Claim 7
Dependent Claim
73 words
A mode changing system for a cassette tape recorder as set forth in claim 5, said operational circuit generating such a control output that said control electric motor is rotated in a direction in which the level of said variable voltage varies toward the lever of said reference voltage and that said control electric motor is stopped when the level of said variable voltage becomes equal to the level of said reference voltage.
References Cited (Backward Citations)
US3947894A
Cited
US4194229A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-06-08 | 1984-12-08 | 1985-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-08 | 1988-12-08 | 1989-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-08 | 1992-12-08 | 1993-06-09 | $7700.00 | Window Closed / Lapsed |