JPH02780B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION According to the present invention, a rotation detector is provided in conjunction with a reel constituting a tape transport mechanism capable of magnetic recording and reproduction, and a plunger operated by using the output of the rotation detector detects the tape. Related to a tape recorder equipped with a lock release mechanism configured to activate a mechanism for releasing operation buttons such as a playback button, rewind button, fast forward button, etc. of a traveling mechanism and to be driven by the rotational force of a motor. The object thereof is to provide a tape recorder in which the rotation detector can operate the plunger reliably, and the plunger can reliably control the operation of the release mechanism.

Generally, in a tape recorder, a rotation detector is linked to a reel that constitutes a tape running mechanism capable of magnetic recording and playback, and the output of the rotation detector is used to operate a plunger, and the plunger is used to press the playback button of the tape running mechanism. , rewind button,
It is configured to activate a release mechanism for an operation button such as a fast forward button. The operation button release mechanism is configured to be driven using the inertia of a flywheel that rotates in conjunction with the motor. However, in the above-mentioned tape recorder, when an attempt is made to switch from a review mode in which the playback button and the rewind button work together to the playback mode by releasing only the rewind button, the rewind button is released and the rewind button is temporarily stopped. Since the regeneration mode cannot be changed until after the rotation detector starts rotating, the time from when the magnet constituting the rotation detector starts rotating until the plunger stops operating varies depending on the magnetic pole position of the stopped magnet with respect to the sensor. Therefore, it may not be possible to release the plunger immediately when the magnet starts rotating again, and in this case,
There is a problem in that the operation release mechanism for the operation button is operated again and the playback button is also released, making it impossible to reliably switch from the review mode to the playback mode, which is the original purpose.

The present invention eliminates such conventional drawbacks, and the present invention will be described below with reference to drawings of embodiments.

FIG. 1 shows an embodiment of the tape recorder of the present invention. In the figure, 1 is an inter-track detector, a playback signal from a detection head H is inputted via an amplifier 2, and a silent part of the tape is detected. Outputs a pulse signal when detected. S _1-1 and S _1-2 are switches that operate in conjunction with each other, and are turned on and off in conjunction with the rewind button of the tape transport mechanism. This switch S _1-1 is a switching switch,
Each of the switches S _1-2 is composed of a non-shooting switch, and the movable terminal of the switch S _1-2 is connected to the output terminal of the inter-track detector 1. Further, the movable terminal of the switch S _1-1 is connected to the power supply terminal of the song interval detector 1 via the switch S ₃ , and one fixed terminal is connected via the diode D ₁ and the resistor R ₁ . It is connected to the base of the transistor _TR1 , and the other fixed terminal is connected to the power supply +B via a switch _S2 , which is turned on and off in conjunction with the playback button of the tape transport mechanism. 3 is a rotation detector, which is a magnet that rotates in conjunction with the motor M of the tape running mechanism.
The input side is equipped with a magnetic sensor S arranged to face the N and S magnetized rows of the magnet Ma and the magnet Ma in conjunction with the motor M.
When Ma is rotating, an output signal of almost zero potential is taken out, and when the magnet Ma stops rotating in conjunction with the motor M, an output signal of a predetermined potential is taken out. ing. It is connected to the base of the transistor TR ₂ via the output terminal R ₃ of the rotation detector 3, and the transistor
A resistor R ₄ is connected to the collector of TR ₂ . The emitter of the transistor TR ₂ is connected to the base of the transistor TR ₃ , and a parallel circuit of a diode D _{2 and} a plunger P is connected to the collector of the transistor TR 3. The other end of the parallel circuit of the resistor R ₄ and diode D ₂ and the plunger P is connected to the power supply +B via the switch S ₂ .
It is connected to the. The above motor M is a transistor
The transistor _TR4 is grounded, and the other end of the resistor ₅ inserted into the base of the transistor _TR4 and the other end of the motor M are connected to the power supply +B via the switch _S2 . In addition, the rotation detector 3
The output terminal of is connected to the collector of the transistor _TR1 . The base of the transistor _TR2 is connected to the other fixed terminal of the switch _S1-2 via a resistor _R2 .

FIG. 2 shows a mechanism for releasing the operation button triggered by the plunger P mentioned above. In the figure, 11 is a flywheel to which the rotation of the motor M is transmitted via the belt 12. Two engaging pieces 13a and 13b are provided on the flywheel 11. Reference numeral 14 denotes a release lever for releasing a lock lever (not shown) that locks the operating states of the playback button, rewind button, and fast forward button, and an operating lever 15 is rotatably supported at one end of the release lever. The operating lever 15 is biased to rotate in one direction by a spring (not shown), and a plunger P is disposed at one end facing the operating lever 15.

In such a tape recorder, when the play button and the rewind button are operated with the switch S ₃ turned off, the switches S _1-1 ,
S _1-2 is applied to the other fixed terminal side, and the switch S ₂ is turned on. Therefore, the tape running mechanism is in a state where the tape is running at high speed. When the tape is rewound to the beginning in this state, the rotation of the reel constituting the tape running mechanism is stopped due to the tape tension, and the rotation of the magnet Ma provided at the input of the rotation detector 3 is also stopped. When the rotation of the magnet Ma is stopped, an output signal of a predetermined potential is taken out from the output terminal of the rotation detector 3, and the output signal is
Since the voltage is applied to the base of the transistor TR ₂ via R ₃ , the transistor TR ₂ is turned on.
When this transistor TR ₂ is turned on, the power supply +B is applied to the base of the transistor TR ₃ via the low resistor R ₄ , so that the transistor TR ₃ is turned on. Therefore, a current flows through the plunger P provided in the transistor TR ₃ , and the plunger P rotates the operating lever 15, which constitutes the operation release mechanism of the operation button, from the dotted line position to the solid line position,
One end of the operating lever 15 is positioned within the rotation locus of the locking claws 13a, 13b provided on the flywheel 11. Then, the operating lever 15 engages the locking pawl 13a or 13b of the flywheel 11.
The lock release lever 14 connected to this operating lever 15 is moved in the direction of arrow A in the figure by
is moved in the same manner, and the operation lock state of the rewind button is released. When the rewind button is released as described above, switches S _1-1 and S _1-2 are switched to one of the fixed terminals, and switch S ₂ , which is linked to the playback button, remains as it is, so the tape cannot run. The mechanism runs the tape at a constant speed and switches to playback mode. At this time, since switch S _1-1 is composed of a switching switch, the power +B is connected during switching.
is applied to the diode D ₁ and the resistor R ₁ via the switch S _1-1 . And transistor TR ₁
Since a predetermined bias is applied to the base of the transistor TR1, the transistor _TR1 is turned on. When this transistor TR ₁ is turned on, the base bias of the transistor TR ₂ is pulled to the ground potential, so that the transistors TR ₂ and TR ₃ are turned off, and the plunger P
operation is canceled. Therefore, depending on the magnetic pole position of the magnet Ma with respect to the magnetic sensor S provided on the input side of the rotation detector 3, the magnet Ma
Even if there is a delay in reducing the base bias of the transistor TR ₂ to zero potential with the output signal from the rotation detector 3 when the plunger P begins to rotate, the plunger P is already deactivated by the action of the transistor TR ₁ . Therefore, it is no longer possible to activate the operation release mechanism of the operation button again and release the operation lock state of the playback button. In this way, it is possible to reliably switch the mode from the review mode to the playback mode.

In the above embodiment, the switches S _1-1 and S _1-2 are configured to be turned on and off by operating the rewind button, but they are configured to be turned on and off in conjunction with the fast forward button. It's okay. In this case, the playback button can be released after a predetermined period of time has elapsed after the fast-forward button is released.

As described above, according to the present invention, the plunger drive circuit whose operation is controlled by the output signal from the rotation detector is forcibly turned off by the switching means whose operation is controlled by the switching switch linked to the rewind button. Since it is configured to be in the operating state, it has the advantage that the output of the rotation detector can be used to reliably change the mode from the review mode to the playback mode by cooperation of the playback button and the rewind button. .

[Brief explanation of drawings]

FIG. 1 is an electrical circuit diagram showing an embodiment of the tape recorder of the present invention, and FIG. 2 is a configuration diagram of the main parts of the device. S _1-1 ...Switching switch, D ₁ , D ₂ ...
…Diode, R ₁ to R ₄ … Resistor, TR ₁ to _{TR 3} …
...transistor, 3...rotation detector, Ma...magnet, S...magnetic sensor, P...plunger.

Claims (1)

[Claims] 1 Release the locked state of the operation buttons such as the playback button and rewind button that make up the tape running mechanism with a plunger that is operated using the output of a rotation detector provided in conjunction with the reel that makes up the tape running mechanism. The lock release mechanism is configured to activate a mechanism for rewinding the tape and release the locked state of the operation button by using the rotational force of a motor constituting the tape running mechanism, and the lock release mechanism is configured to activate a mechanism to release the lock state of the operation button using the rotational force of a motor constituting the tape running mechanism, and A switching means is provided which is operated by supplying power when the switching switch is turned on and off, and this switching means forces the drive circuit of the plunger constituting the lock release mechanism. A tape recorder characterized in that it is configured to be in a non-operating state.