JPH0452825Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a recorder/player having a playback function and/or a recording function using a fixed-head endless tape.

[Prior Art] A conventional recorder/player using a fixed head type endless tape has a tape reel 5 as shown in FIG.
5, a guide roll 58, a capstan 53, a pinch roll 54, a head 56, and a crimp pad 57. The capstan 5 rotates due to the drive of the conductive parts.
3 and pinch rolls 54 to run in the direction of the arrow. The tape T running as described above runs while the magnetic film is in contact with the core of the head 56 via a pressure bonding pad 57, thereby recording or reproducing the tape.

[Problems to be solved by the invention] As mentioned above, in the conventional recorder/player using a fixed head type endless tape, because the head is fixed, the tape T remains connected to the head 56 and the crimp pad even when the tape stops running. 57 and is held in a crimped state as in the case of running. Therefore, the magnetic film of the tape T that has been stopped running for a long time causes adhesion on the contact surface with the core, and when the motor is restarted, the tape becomes unable to run due to the adhesion or the magnetic film This caused damage to the tape and caused tape deterioration.

The present invention solves the above-mentioned problems and provides a recorder/player that does not cause any functional problems even if it is stopped and left unused for a long time.

[Means for Solving the Problems] In order to achieve the above object, the present invention brings the magnetic film of the tape into close contact with the contact surface of the core of the head when the tape is running, and separates the tape from the contact surface of the head when the tape stops running. I did it like that.

That is, in a fixed-head recorder/player that has a running section that runs an endless magnetic tape through a capstan that is rotated by the drive of a motor, and has both a playback function and a recording function, or only a playback function, the tape can be It is characterized by a motor reversing circuit that reverses the capstan for a predetermined period of time in order to slightly retract the tape when the tape stops running, and a nip-shaped tension guide and a tape retracting guidance guide provided at the front and rear of the head, respectively.

The reversing circuit includes a charging/discharging circuit that charges the tape while it is running and discharges it when the tape is stopped, a transistor gate that reverses the motor for a discharge time set by the circuit, and the power switch. I did it like that.

[Function] Since the present invention has the above-mentioned configuration, during recording or playback operations, the tape is run by the capstan, which is rotated by driving the capstan motor, and the pinch roll, which is nipped on the capstan. The nip-shaped tension guide brings the head into close contact with the core contact surface of the head under appropriate tension, ensuring reliable recording or playback operations.

Further, when the operation is stopped, the transistor gate of the reversing circuit is activated by the amount of electricity in the capacitor charged during the operation, and the capstan is reversed for a predetermined discharging time. Therefore, the tape nipped between the capstan and the pinch roll retreats, creating slack between the tape and the nip-shaped tension guide provided at the front stage of the head, and the tape passes through the tape retreat guide to the contact surface of the core of the head. Dissociate more completely.

[Example] Hereinafter, the present invention will be specifically explained based on the drawings.

FIG. 1 is a plan view showing the tape running section of the present invention;
FIG. 2 is an operating circuit diagram of the recorder/player of the present invention having only a playback function. In the figure, 1 is a capstan motor, 2a is a motor pulley, 2b is a flywheel, 3 is a capstan, 4 is a pinch roll, and 5
1 is a belt, 6 is a tape reel, 7 is a head, 9 is a guide roll, 11 is a nip-like tension guide, 12 is a tape retraction guide, and T is a magnetic tape.

As shown in FIG. 1, a capstan 3 is provided at the tip of the shaft of the flywheel, and when the capstan motor 1 is driven, a transmission section consisting of a motor pulley 2a, a flywheel 2b, and a belt 5 is driven to drive a motor, which will be described later. Coupled with the speed control characteristic of the circuit 20a, it is configured to rotate at a constant speed. Tape T is an endless magnetic tape and tape reel 6
The tape is pulled out from the winding core in the direction of arrow D, passes through the guide roll 9 and the nip-shaped tension guide 11, and slides closely against the core contact surface of the head 7, while passing between the guide posts 12, which are guides for tape retreat. Then, it is nipped by the rotating capstan 3 and the pinch roll 4 and travels in the direction of the arrow.

The nip-shaped tape guide 11 has a fixed tape sliding surface 11a and a thin elastic support fitting 11b made of, for example, a phosphor bronze plate, which has a tape crimping pad at the tip to lightly hold the tape in the nip. Appropriate tension is applied to form an appropriate adhesion state between the tape and the head, and when the tape stops running, the tape is held lightly and maintained in a fixed position. The guide for tape retraction is formed by a pin-shaped post formed with a moderate distance.
When the tape is running, an appropriate tape curved surface is formed against the core contact surface of the head, and when the tape is retracted by reversing the capstan when the tape is stopped, a chain line shown in FIG. 1 is formed between the tension guide 11 and the tape holding position. A slack in the tape is formed as shown by , so that the tape is completely separated from the contact surface of the core of the head.

FIG. 2 shows an operating circuit of a recorder/player having only a playback function according to the present invention.
b, capstan motor 1, and audio playback circuit 20
c, a head 7, a speaker 33, and a power source 34.

The motor drive circuit 20a is a circuit mainly composed of an IC28, and the IC28 has a built-in stable low reference power supply circuit for speed control of a small motor.For example, LA5522, which can handle speeds, is used, and a variable resistor 29 is used.
The speed can be set appropriately.

The motor reversing circuit 20b includes a power switch 21 and a transistor 27 forming a transistor gate.
It consists of a, 27b and a charging/discharging circuit. The power switch 21 is a 2-pole, double-throw switch, and when it is turned on, terminals 22a and 23a and 22b and 23b are connected.
When the terminals 23a and 24a and 23b and 24b are connected to the OFF side, respectively, the terminals 23a and 24a are connected. The charging/discharging circuit is formed by a capacitor 25 and a resistor 26.

When the power switch 21 is turned on,
A power supply 34 is connected to the motor drive circuit 20a and the audio reproducing circuit 20c, and the motor 1 is driven to start running the tape, and the audio reproducing circuit is also activated to start replaying the tape. At the same time, the capacitor 25 is also connected to a power source so that it is charged.

When the switch 21 is turned to the OFF side, the power supply 34 connected to the motor drive circuit 20a and the audio reproduction circuit 20c is cut off, and the motor drive and reproduction operation are stopped. At the same time, the terminal 24a of the motor reversing circuit is connected to 23a, and the charge charged in the capacitor 25 is applied to the base of the transistor 27a, and the discharge time (K×C ₁₁ /R ₉ ) set by the capacitor 25 and the resistor 26 is During this period, transistor 27b continues to operate. When the transistor 27a is activated, the transistor 27
Since b also enters the operating state, motor terminal B is connected to power supply 3.
4, and terminal A is connected to the ground side via terminals 23b and 24b of switch 21. Therefore, the motor 1 rotates in reverse for the discharge time.

The audio reproduction circuit 20c is mainly composed of an amplifier circuit,
The tape is connected to a power source 34 so that the tape is played back by the speaker 23 via the head 7.

FIG. 3 shows a block diagram of an operating circuit for a recorder/player having both a playback function and a recording function according to the present invention. As shown in the figure, in this case, a motor drive circuit 20a, a motor reversing circuit 20b, and a recording/reproducing circuit 2
0d, motor 1, oscillator 30, head 3
1, 32, a speaker 33, a microphone 35, and a power supply 34, and the motor drive circuit 20a and motor reversing circuit 20b drive the motor 1 when the power switch 21 is turned on as described above. When the tape is run and turned to the OFF side, the motor reversing circuit 20b is activated and the motor 1 is reversed for the discharge time set by the capacitor 25 and resistor 26 of the charging/discharging circuit, and the tape runs for that time. It's just like being pulled back.

The recording/reproducing circuit 20d mainly includes a recording/reproducing amplifier and a recording/reproducing switch, and is connected to a power source 34 to enable recording or reproducing operation.

The operation of the present invention will be described below with reference to FIGS. 1 and 2 for a recorder/player having a playback function.

Since the present invention has the above configuration, when the power switch 21 is turned on to run and play the tape, the motor drive circuit 20a and the audio playback circuit 2
0c is connected to the power source 34, the motor 1 is driven, and the regeneration circuit is activated. The tape T travels in the direction of the arrow by the capstan 3 rotated by the drive of the motor 1 and the pinch roll 4 nipping the capstan. The tape T runs while being given an appropriate tension by the nip-shaped tension guide 11 provided at the front stage of the head, so the tape T runs in close contact with the head 7, and the motor drive circuit
Combined with the speed control function of IC28, the tape T runs stably and plays reliably.

Next, in order to stop the reproducing operation, when the switch 21 is turned to the OFF side, the motor drive circuit 20a and the audio reproducing circuit 20c are cut off from the power supply 34, and the reproducing operation and the motor 1 are stopped. At the same time as the stop, the terminal A of the motor 1 is connected to the ground side via the terminals 23b and 24b of the power switch 21. On the other hand, the charges accumulated in the capacitor 25 during the tape running through the terminals 23a and 24a of the power switch 21 are transferred to the transistor 27.
A is applied to the base of transistor 27a, and then transistor 27b is also activated. Due to the operation of the transistor, the terminal B of the motor 1 is connected to the positive side of the power supply 34, and the motor 1 is reversed, and is reversed only during the discharge time (K×C ₁₁ /R ₉ ) of the charge stored in the capacitor 25. Continue. Therefore, the tape T is pulled back in the opposite direction of the arrow by the capstan 3 and the pinch roll 4, which are reversed by the reversal of the motor 1. On the other hand, the tape T is held in the nip by the tension guide 11, so the tape T is pulled back in the direction opposite to the arrow. A slack is formed between the tape T and the guide guide 12 for retracting the tape, and the tape T is completely separated from the core contact surface of the head 7 as shown by the one-dot chain line.

[Effects of the invention] The present invention includes a motor reversing circuit that reverses the rotation for a predetermined period of time when the tape stops running, separate from the motor drive circuit, and a nip-shaped tension guide that holds the tape when the tape stops before and after the head of the tape running section. Since tape retraction guides are provided, when the motor drive is stopped in order to stop recording or playback, the tape is appropriately pulled back by the operation of the motor reversing circuit, and is completely separated from the head core contact surface. be done. Therefore, it is possible to provide a recorder/player that can completely prevent the adhesion of the magnetic film of the tape to the core, which occurs when the tape is stopped for a long time.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing the tape running section of the present invention, Fig. 2 is a diagram showing the operation circuit of the recorder/player having only the playback function of the present invention, and Fig. 3 is a diagram showing the operating circuit of the recorder/player having only the playback function of the present invention. 4 is a block diagram showing an operating circuit of a recorder/player having a conventional type of recorder/player. FIG. 4 is a plan view showing a tape running section of a conventional type recorder/player. 1... Capstan motor, 2a... Motor pulley, 2b... Flywheel, 3... Capstan, 4... Pinch roll, 5... Belt, 6...
... Tape reel, 7 ... Head, 9 ... Guide roll, 11 ... Nip-shaped tension guide, 12
...Tape retraction guide, 20a...Motor drive circuit, 20b...Motor reversing circuit, 20c...
...Audio playback circuit, 20d...Recording/playback circuit, 21...
Power switch, 22a, 22b, 23a, 23
b, 24a, 24b... terminal, 25... capacitor, 26... resistor, 27a, 27b... transistor, 28... IC, 29... variable resistor, 30...
...Oscillator, 31, 32...Head, 33...
Speaker, 34...power supply, 35...microphone.

Claims (1)

[Claims for Utility Model Registration] 1. A fixed-head recording device that has a running section that runs an endless magnetic tape through a capstan that is rotated by the drive of a motor, and that has both playback and recording functions or only the playback function. In the re-machine, a motor reversing circuit for reversing the capstan for a predetermined period of time in order to slightly retract the tape when the tape stops running, and a running section provided with a nip-shaped tension guide and a tape retracting guide at the front and rear of the head, respectively. A fixed head recorder/player characterized by having: 2. The motor reversing circuit includes a charging/discharging circuit that charges the tape while it is running and discharges it when the tape stops running in response to the operation of the power switch, a transistor gate that reverses the motor for a discharge time set by the circuit, and the power switch. A fixed head recorder/player according to claim 1 of the utility model registration claim consisting of: