US3758834A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic tape motor drive control apparatus for magnetic tape recorders
Assignee: Teac Corp
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Filing: 1972-02-22
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Granted: 1973-09-11
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Expires: 1992-02-22
Abstract
Abstract A magnetic tape drive control apparatus for magnetic tape recorders adapted such that when an operation is effected for starting a magnetic tape from its standstill condition, a plunger solenoid for bringing a pinch roller into or out of rotary contact with a capstan is energized after the capstan has reached a constant-speed revolving condition and that when an operation is achieved for changing the direction of travel of the magnetic tape from left to right, the plunger solenoid is deenergized from the time of the tape direction changing operation until the capstan comes to turn from anticlockwise to clockwise at a constant speed. In the magnetic tape drive control apparatus means for changing the direction of travel of the magnetic tape is controlled with a relay circuit, the relay circuit is energized with an output from a switching transistor having a charging capacitor connected to the input side thereof and the charging capacitor is shorted by a normally open contact which is closed by a conductive foil attached to the magnetic tape.
Inventors
- 👤 H Inoue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:16
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/18; G11B15/44; G11B15/26; G11B15/28; G11B15/29; G11B15/46; G11B15/48
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
270 words
A magnetic tape drive control apparatus for magnetic tape recorders comprising a plunger solenoid for bringing a pinch roller into or out of rotary contact with a capstan with a magnetic tape being gripped therebetween, switching means having a control terminal, a relay having a normally closed contact and connected to a power source through said switching means, a switch turned on by an operation for driving said magnetic tape selectively in first and second directions, first and second charging and discharging capacitors shorted and non-shorted respectively during travelling of the magnetic tape in said first direction and thereafter non-shorted and shorted respectively by the operation for driving the magnetic tape in said second direction, said plunger solenoid being connected to said power source through said normally closed contact of the relay and said switch, said control terminal of the switching means being connected to said power source through said first and second charging and discharging capacitors connected in series to each other, said switching means being controlled to be in the on state based upon a charging current to said first charging and discharging capacitor when the latter is altered from its shorted condition to the non-shorted condition, in which, when the opeRation is achieved for altering the direction of travel of the tape from said first to said second direction, the plunger solenoid is held deenergized until the charging current to the first charging and discharging capacitor stops or becomes lower than a predetermined level thereof from the time of said operation for altering the direction of travel of the tape, and then the plunger solenoid is energized.
Claim 2
Dependent Claim
270 words
A magnetic tape drive control apparatus for magnetic tape recorders comprising a plunger solenoid for bringing a pinch roller into or out of rotary contact with a capstan with a magnetic tape being gripped therebetween, switching means having a control terminal, a relay having a normally closed contact and connected to a power source through said switching means, a switch turned on by an operation for driving said magnetic tape selectively in first and second directions, first and second charging and discharging capacitors shorted and non-shorted respectively during travelling of the magnetic tape in said first direction and thereafter non-shorted and shorted respectively by the operation for driving the magnetic tape in said second direction, said plunger solenoid being connected to said power source through said normally closed contact of the relay and said switch, said control terminal of the switching means being connected to said power source through said first and second charging and discharging capacitors connected in series to each other, said switching means being controlled to be in the on state based upon a charging current to said first charging and discharging capacitor when the latter is altered from its shorted condition to the non-shorted condition, in which, when the opeRation is achieved for altering the direction of travel of the tape from said first to said second direction, the plunger solenoid is held deenergized until the charging current to the first charging and discharging capacitor stops or becomes lower than a predetermined level thereof from the time of said operation for altering the direction of travel of the tape, and then the plunger solenoid is energized.
Claim 3
Dependent Claim
67 words
A magnetic tape drive control apparatus for magnetic tape recorders as claimed in claim 1, which includes means for supplying the series-connected first and second charging and discharging capacitors with a voltage higher than that during the standstill condition of the tape based upon the voltage of said power source when the operation is achieved for driving the magnetic tape selectively in the first and second directions.
Claim 4
Dependent Claim
78 words
A magnetic tape drive control apparatus for magnetic tape recorders as claimed in claim 1, which includes a motor for driving said capstan, a power source producing a first voltage and a second voltage higher than the former, and means for supplying said motor with the second voltage only when the relay is energized and with the first voltage except when the operation for maintaining the tape in its standstill condition and except when the relay is energized.
Claim 5
Dependent Claim
28 words
A magnetic tape drive control apparatus for magnetic tape recorders as claimed in claim 3, wherein said first and second voltage supplying means includes contacts of said relay.
Claim 6
Dependent Claim
214 words
A magnetic tape drive control apparatus for magnetic tape recorders comprising a first normally open contact shorted by a conductive foil attached to a magnetic tape when said magnetic tape is driven in a first direction, a second normally open contact shorted by a conductive foil attached to said magnetic tape when said magnetic tape is driven in a second direction, a first switching transistor controlled by closing of said first normally open contact to be in the off state from the on state, a second switching transistor controlled by closing of said second normally open contact to be in the off state from the on state, a third switching transistor controlled to be in the on state from the off state by turning-off of said first switching transistor when said second switching transistor is in the on state and to be controlled to be in the off state from the on state by turning-off of said second switching transistor, and a tape drive control circuit for controlling the direction of travel of said magnetic tape to said first direction when said third switching transistor is in the off state and controlling the direction of travel of said magnetic tape to said second direction when said third switching transistor is in the on state.
Claim 7
Dependent Claim
214 words
A magnetic tape drive control apparatus for magnetic tape recorders comprising a first normally open contact shorted by a conductive foil attached to a magnetic tape when said magnetic tape is driven in a first direction, a second normally open contact shorted by a conductive foil attached to said magnetic tape when said magnetic tape is driven in a second direction, a first switching transistor controlled by closing of said first normally open contact to be in the off state from the on state, a second switching transistor controlled by closing of said second normally open contact to be in the off state from the on state, a third switching transistor controlled to be in the on state from the off state by turning-off of said first switching transistor when said second switching transistor is in the on state and to be controlled to be in the off state from the on state by turning-off of said second switching transistor, and a tape drive control circuit for controlling the direction of travel of said magnetic tape to said first direction when said third switching transistor is in the off state and controlling the direction of travel of said magnetic tape to said second direction when said third switching transistor is in the on state.
Claim 8
Dependent Claim
190 words
A magnetic tape drive control apparatus for magnetic tape recorders comprising means for changing the direction of travel of a magnetic tape, a switching transistor, means responsive to the output from said switching transistor, control means for controlling said tape travelling direction changing means with the output from said responsive means, a charging capacitor connected to a power source through a resistor and to the input of said switching transistor, and normally open contacts connected across said charging capacitor and shorted by a conductive foil attached to said magnetic tape, in which said charging capacitor is normally charged by said power source through said resistor and discharged when the normally open contacts are shorted by said conductive foil and in which said switching transistor is normally held in on state by the normally charged voltage of the charging capacitor and said switching transistor is put in the off state upon discharging of the charging capacitor and held in the off state for a period of time determined by the capacitance of said charging capacitor and the resistance of said resistor after the contacts are brought out of their shorted condition.
Claim 9
Dependent Claim
190 words
A magnetic tape drive control apparatus for magnetic tape recorders comprising means for changing the direction of travel of a magnetic tape, a switching transistor, means responsive to the output from said switching transistor, control means for controlling said tape travelling direction changing means with the output from said responsive means, a charging capacitor connected to a power source through a resistor and to the input of said switching transistor, and normally open contacts connected across said charging capacitor and shorted by a conductive foil attached to said magnetic tape, in which said charging capacitor is normally charged by said power source through said resistor and discharged when the normally open contacts are shorted by said conductive foil and in which said switching transistor is normally held in on state by the normally charged voltage of the charging capacitor and said switching transistor is put in the off state upon discharging of the charging capacitor and held in the off state for a period of time determined by the capacitance of said charging capacitor and the resistance of said resistor after the contacts are brought out of their shorted 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) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |