JPS6232363Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape recorder, and more particularly to a tape recorder in which the magnetic tape transfer speed can be switched in two stages, high or low, in queue mode.

In a tape recorder, the so-called cue operation for locating the beginning of a recorded signal is performed by lightly touching a recorded magnetic tape in fast forward or rewind mode with the playback head, listening to the playback sound, and checking the signal. However, if the speed is too high, the magnetic tape will be moved a considerable amount even if it detects the change in the presence or absence of the signal and then enters the stop mode. It is necessary to repeat fast-forwarding or rewinding, playback, or stop operations, and it is not possible to easily locate the beginning of the signal, and the content of the signal cannot be determined. Therefore, when it is desired to obtain a desired position in the middle of the signal, the operation becomes even more complicated. To solve this problem, it may be possible to slow down the magnetic tape transport speed in queue mode to the extent that the content of the playback signal can be determined.
This has the disadvantage that searching takes a considerable amount of time.

The present invention solves these conventional drawbacks and will be described in detail below with reference to the drawings.

The figure shows an embodiment of the device of the present invention, in which mode selection switches S ₁ , composing a group of non-lock switches are shown.
S ₂ , S ₃ and S ₄ correspond to fast forward, rewind, cue and stop switches, respectively, and are formed by normally open touch switches or the like. One contact of each switch is connected to the required positive DC power supply +E ₁ , and the other contact is connected to flip-flop circuits (hereinafter referred to as FF circuits) 2 to 2 which constitute the holding circuit group in the control circuit 1.
4 or connected to OR circuits 5 and 6. The other contact of the fast forward switch _S1 is connected to the set terminal S of the FF circuit 2 and to one input terminal of an OR circuit 6 whose output terminal is connected to the reset terminal R of the FF circuit 3. rewind switch
The other contact of _S2 is connected to the set terminal S of the FF circuit 3, and also to one input terminal of an OR circuit 5 whose output terminal is connected to the reset terminal of the FF circuit 2. The other contact of the key switch _S3 is connected to the set terminal S of the FF circuit 4, and the other contact of the stop switch _S4 is connected to the other input terminal of the OR circuits 5 and 6 and the reset terminal R of the FF circuit 4.
are connected to each.

The FF circuit 2 maintains the first set state regardless of the closing time by closing the fast-forward switch _S1 , and outputs a first control output that puts the electric circuit, mechanical section, etc. of the recorder main body 7 into the fast-forward mode. When the rewind switch _S2 is closed, the FF circuit 3 maintains the second set state regardless of the closing time and outputs a second control output that puts the recorder main body 7 in the rewind mode.
By closing the key switch _S3 , the FF circuit 4 maintains the third set state regardless of the closing time, and causes the playback head (not shown) of the recorder body 7 to lightly contact the magnetic tape (not shown) for playback. A third control output is output for controlling the mechanical parts and the like to enable operation. The set state of FF circuit 2 is the rewind switch.
By closing S ₂ or stop switch S ₄ , the FF
The set state of the circuit 3 is released by closing the fast forward switch _S1 or the stop switch _S4 . The set state of the FF circuit 4 is released only by closing the stop switch _S4 . Therefore, FF circuit 4 can take a set state independently of FF circuit 2 or 3.

The first control output and the second control output outputted from the control circuit 1 control the power supply unit ₁₂ which outputs a predetermined set voltage.
The common terminals a, a' of _S6 are always connected to the grounded changeover contacts b, b', but when the first or second control output is output from the FF circuit 2 or 3, the + terminal of the variable DC power supply E2, which outputs a set voltage and has one side grounded G by the operation of the relay _RL1 or _RL2 , is connected to the + terminal of the variable DC power supply _E2 .
The common terminal a of the switch _S5 is connected to the inverting input terminal (-) of the differential input type operational amplifier 10 via a required resistor, and the common terminal a of the switch S6 is connected to the inverting input terminal (-) of the differential input type operational amplifier ₁₀ via a required resistor.
The common terminal a' of each of the op-amps 10 is connected to the non-inverting input terminal (+) via a required resistor. The output terminal of the op-amp 10 is connected to the common base of the transistors _Q1 and _Q2 of opposite conductivity types that constitute the switching circuit ₁₁ .
The collector of PNP transistor Q1 is connected to a positive DC power supply + _E3 , and the collector of PNP transistor _Q2 is connected to a negative DC power supply _-E3 . The emitters of transistors _Q1 and _Q2 are connected to each other, and their connection point P is connected to one terminal of drive motor M, the other terminal of which is grounded G via detection resistor _R1 . Detection resistor _R1 generates a detection voltage based on the current flowing through drive motor M, and this detection voltage is input to operational amplifier ₁ .
A positive feedback resistor _R2 connected between the connection point P and the non-inverting input terminal (+) of the operational amplifier 10 provides positive feedback to the non-inverting input terminal (+), thereby preventing fluctuations in the rotation speed of the drive motor M due to load fluctuations. A negative feedback resistor _R3 connected between the connection point P and the inverting input terminal (-) of the operational amplifier 10 determines the gain of the operational amplifier 10 and stabilizes its operation.
The resistors R ₁ , R ₂ , and R ₃ constitute a motor drive circuit 9 .

In the motor drive circuit 9 and the power supply unit 12, the switch S5 is switched to the switching contact c side and the switch _S5 is changed to the switching contact c side.
When a set voltage based on the DC power supply _E2 is applied to the inverting input terminal (-) of the operational amplifier 10, a negative output voltage of a required level is applied to the switching circuit 11 from the output terminal of the operational amplifier 10. Therefore, PNP transistor _Q2 of switching circuit 11 is turned on.
Since the drive motor M and the detection resistor _R1 are connected in series between the negative DC power source _-E3 and the ground G, the drive motor M rotates in the first direction, and the positive feedback resistor _R2 and the negative feedback resistor It rotates at a high specified speed corresponding to the conductivity of the transistor Q ₂ based on the level of the negative output voltage of the operational amplifier 10 determined by each feedback amount of R ₃ , and the reel stand devices 8, 8 are placed in a fast-forward mode. On the other hand, when the switch S ₆ is switched to the switching contact c' side, the operational amplifier 10 outputs an output voltage of the required positive level, and the drive motor M starts the second drive at a high specified speed depending on the conductivity of the NPN transistor Q ₁ . direction to put the reel stand devices 8, 8 into rewind mode.

Furthermore, the device of the present invention includes a speed reduction means 14 between the variable DC power source E ₂ and the motor drive circuit 9. Deceleration means 1
4 is composed of an NPN transistor _Q3 and a variable resistor VR, and the NPN transistor _Q3 is a fast forward switch.
The bases are connected to the contacts connected to the set terminals S of the FF circuits 2 to 4 corresponding to S ₁ , rewind switch S ₂ and key switch S ₃ through respective required resistances, the emitters are grounded G, and the collectors are Switches S ₅ and S ₆ of drive circuit 9 via variable resistor VR
are connected to switching contacts c and c', respectively. Transistor _Q3 is turned on when fast forwarding, rewinding, or when the key switch is closed, and turned off when the key switch is opened.

In the device of the present invention having the above configuration, in the fast forward or rewind mode, the fast forward switch _S1 or the rewind switch _S2 is instantaneously closed to set the FF circuit 2 or 3, and the first output from the control circuit 1 is set. The first or second control output switches the switch S ₅ or S ₆ to a variable DC
By switching to the power supply section _E2 side, the reel stand devices 8, 8 of the recorder main body 7 are rotated at high speed in the desired direction based on the variable DC power supply _E2 , and other mechanical sections are set to fast forward or rewind mode. It will be done.

The queue mode is obtained when either the fast forward switch _S1 or the rewind switch _S2 and the queue switch _S3 are both closed so that the FF circuit 2 or 3 and the FF circuit 4 are in the set state at the same time. That is, by outputting the first or second control output depending on the set state of the FF circuit 2 or 3, the reel stand devices 8, 8 are rotated in the desired direction as in the fast forward or rewind mode, and the FF circuit 4 is rotated in the desired direction. This is achieved by bringing the reproducing head into contact with the magnetic tape.

Fast forward switch S ₁ with this queue mode selection operation
Alternatively, if the rewind switch _S2 and the key switch _S3 are closed and then opened, the magnetic tape is transported at the high specified speed in the fast forward or rewind mode based on the variable DC power supply _E2 which is the output of the power supply section 12. , a transistor forming deceleration means 14 during fast forwarding or rewinding or during the continuation of the closing operation of the key switch.
In order to maintain Q ₃ in the ON state, the voltage applied to the inverting input terminal (-) or non-inverting input terminal (+) of the operational amplifier 10 is set based on the variable DC power supply E ₂ based on the resistance value of the variable resistor VR. Since the voltage decreases more than the voltage, the level of the output voltage of the operational amplifier 10 also decreases. Therefore, the conductivity of the transistor Q ₂ or Q ₁ decreases, the voltage between the terminals of the drive motor M decreases by a predetermined value, and the rotation speed decreases, so that the reel stand devices 8, 8 rotate at a low speed.

Therefore, in queue mode these switches
By opening/closing any one of S ₁ , S _{2 ,} and S ₃ , the magnetic tape transfer speed can be switched between high speed and low speed. This fast or slow speed is variable DC
The desired speed can be achieved by appropriately selecting the voltage value of the power supply _E2 or the resistance value of the variable resistor VR, so set this to a sufficiently high speed and a low speed that is slow enough to distinguish the content of the reproduced signal. If this is done, it is possible to carry out efficient cueing operations, etc. by moving portions away from the desired position at high speed and moving portions near the desired position at low speed.

In addition, in this embodiment, the deceleration means is configured to operate in conjunction with the closing operation of the fast forward switch or rewind switch, so that the magnetic tape does not need to be closed when the switch is closed at the start of the fast forward or rewind drive. Since time is driven slowly, it is protected from sudden shocks.

The device of the present invention is not limited to the embodiments described above, and the control circuit or drive circuit can take various forms, for example, the deceleration means may be provided to operate only when the key switch _S3 is closed. be.

According to the above-described device of the present invention, in the queue mode, the magnetic tape transfer speed can be easily changed to two speeds, high speed and low speed, by a switch operation, so it is possible to perform signal cueing etc. quickly and accurately. A tape recorder can be realized.

[Brief explanation of drawings]

The figure shows a circuit diagram of an embodiment of the device of the present invention. 1... Control circuit, 2, 3, 4... Flip-flop circuit, 8, 8... Reel stand device, E ₂ ... Variable DC power supply, M... Drive motor, S ₁ ... Rapid forward switch, S ₂ ... Rewind switch, S ₃ ... key switch, Q ₃ ... transistor, VR ... variable resistor.

Claims (1)

[Claims for Utility Model Registration] A group of non-locking switches consisting of normally open touch switches for selecting an operating mode such as fast forward, rewind or queue mode, and a closing time when the fast forward switch is closed. a first holding circuit that maintains and outputs a first control output for setting the motor in a fast-forwarding mode regardless of the current speed and applying a required drive voltage to the motor that drives the reel stand device in order to rotate the motor in a required direction; When the rewind switch is closed, the rewind mode is set regardless of the closing time, and a required drive voltage is applied to the motor that drives the reel stand device in order to rotate the motor in a required direction. a second holding circuit that holds and outputs a second control output for application; and a third holding circuit that holds and outputs a second control output to set the queue mode regardless of the closing time when the key switch is closed. a holding circuit group comprising at least a third holding circuit; and a holding circuit group including at least a third holding circuit; and a holding circuit group including at least a third holding circuit; and a holding circuit group including a third holding circuit; a power supply unit that supplies a driving voltage; and a power supply unit that responds to an opening or closing operation of at least one switch of the non-lock switch group, and that the power supply unit drives the reel stand device at high speed when the one switch is opened. In order to generate a drive voltage of a preset value for the reel stand device, and a drive voltage of a value lower by a predetermined value than the preset value for the power supply section to drive the reel stand device at low speed when the power supply section is closed. means for switching and controlling the value of the drive voltage generated by the power supply section, and after the drive voltage is supplied to the motor drive circuit by the mode selection and closing operation,
The reel stand device opens the one switch;
A tape recorder characterized by being driven at high and low speeds in response to a closing operation.