JPS6045486B2 - Tape slack remover for tape recorder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a tape slack removing device for removing slack in a tape in a tape cassette installed in a tape recorder.

If the tape in a tape cassette is loose, if you insert it into a tape recorder and operate the tape recorder, the tape will become unstable and the tape will run unstable.
This may cause damage to the tape.

For this reason, tape recorders are provided with a tape slack removing device.

However, in the case of conventional tape slack removing devices,
Since the tape recorder had a structure in which slack in the tape was removed by applying balanced rotational forces in opposite directions to the take-up reel and the supply reel, the structure of the tape recorder was complicated. This configuration also has the disadvantage that it is difficult to reliably remove slack in the tape.

The present invention has been made in view of the above-mentioned drawbacks, and an object of the present invention is to provide a tape slack removing device capable of reliably removing tape slack with a simple configuration.

A feature of the present invention is that after the tape is crimped, the tape recorder is set to a rewinding state, and the tape is rewound to remove slack in the tape.

Embodiments of the present invention will be described below with reference to the drawings. 1st
In the figure, reference numeral 1 denotes a magnetic head supporting substrate, and this magnetic head supporting substrate 1 is capable of reciprocating in the direction in which the tape cassette 2 is located.

Pinch rollers 4 and 4' are provided on the magnetic head supporting substrate 1 at positions facing each other with the magnetic head 3 interposed therebetween.
are arranged so that they can rotate freely. The magnetic head support substrate 1 and the operating plunger 5 of the magnetic head support substrate/plate 1 are connected via a full-length lever 6, and the full-length lever 6 is connected to a fulcrum 6a.
It can be rotated freely around the center.

A pair of flywheels 7, 7' are arranged below the magnetic head supporting substrate 1, and capstans 8, 8' are fixed to the flywheels 7, 7', respectively. Reference numeral 9 indicates a drive motor for the flywheel 797', and 10 indicates a belt suspended between the pulley 9a of the drive motor 9 and the flywheels 7, 7''.

The idler support lever 11 is rotatably connected to an operating plunger 12 for the idler support lever 11 via a pin 11a. 13 is idler 1
This is an idler drive motor for transmitting rotation by bringing the pulley 1J14 into contact with the pulley 1J14.

The idler 15 is brought into contact with a pair of left and right reel stands 16, 16'' when the supporting lever 11 is in the neutral position.

A belt 18 for transmitting the rotation of the reel stand 16'' to the magnet 17 is suspended between one reel stand 16'' and the magnet 17. The magnet 17 is provided to cooperate with the detection element 19 to convert the rotation of the reel stand 16'' into an electrical signal, and on the outer periphery of the magnet 17, there are holes for the purpose of dense signal detection. N pole and S
A large number of poles are arranged alternately at regular intervals.

Reference numeral 20 denotes a detection switch for the tape cassette 2, which is provided to switch a logic circuit provided in the operating electric circuit 21 of the tape recorder, which will be described later, from a reset state to a set state when the tape cassette 2 is detected. .

Next, the electric circuit 21 for operating the tape recorder will be explained with reference to FIG.

The electric circuit 21 for operation of the tape recorder has output terminals 01 and 0, respectively, by manually operating a fast forward switch S1, a rewind switch S2, a playback switch S3, a stop switch S4, and a recording switch S5.

,03,04,0. Generates an output signal from. A control circuit 22 is provided. Note that the switches S1 to S5 are of the so-called feather touch type. The output terminal 01 corresponding to fast forwarding and the output terminal 02 corresponding to rewinding are connected to a starting circuit 23 of the motor 13 and a starting circuit 24 of the plunger 12, respectively. There is a line. Further, the output terminal 03 corresponding to regeneration is connected to a starting circuit 25 for the motor 9 and a starting circuit 26 for the plunger 5, respectively. Further, the output terminal 04 corresponding to stop is connected to a transistor Q1 of an auto-stop circuit 27 having a function to be described later.

Further, a switch S5 corresponding to recording is connected to a recording circuit (not shown). Next, tape cassette 2
An auto-stop circuit 277 has both a function of detecting the end of the tape 2a and generating an output signal to stop the operation of the tape recorder, and a function of generating an output signal to stop the operation of the tape recorder after a certain period of time. The configuration of is explained below.

The output signal output from the detection element 19 such as a Hall element is input to the waveform shaping circuit 28, and is shaped by the waveform shaping circuit 28 to become a rectangular wave A as shown in FIG. An output signal is output from the circuit 28.

The rectangular wave A is further connected to a capacitor C1 and a diode Dl.
, D2 to form the sawtooth waveform A'' shown in FIG.
The signal is input to the transistor Q2 through the connection point with the transistor Q2. Note that the capacitor C2 receives a constant voltage B(
(see FIG. 4), and is provided to turn on the transistor Q2. An auto-stop signal for stopping the operation of the tape recorder is taken out from the collector side of the transistor Q2) to which the resistor t/LR2 is connected, and this auto-stop signal is connected to the input terminal 14 corresponding to stopping the control circuit 22. The signals are inputted to a logic circuit 29 which switches from a reset state to a set state by operating the cassette tape detection switch 20.

In addition, this logic circuit 29 is configured to output an output signal for taking up slack in the tape to the starting circuit 26 of the plunger 5 and the input terminal 12 corresponding to rewinding of the control circuit 22, respectively, when in the set state. be. Next, the operation of the tape slack removing device for a tape recorder according to the present invention will be explained.

When the tape cassette 2 is installed in the tape recorder, the detection switch 20 is closed and the logic circuit 29 changes from the reset state to the set state.

As a result, an output signal for taking up slack in the tape is output to the input terminal 12 of the control circuit 22 corresponding to rewinding and the starting circuit 26 of the plunger 5. By activation of the activation circuit 26, the plunger 5 is driven, and the magnetic head support substrate 1 is moved forward in the direction in which the tape cassette 2 is located. As a result, pinch rollers 3, 3'' and capstan 8
, 8'' are in pressure contact, and the tape 2 interposed between them
The vehicle a is held between the pinch rollers 3, 3'' and the capstans 8, 8'' and becomes unable to travel. On the other hand, at the same time, the logic circuit 29 outputs an output signal for taking up slack in the tape to the input terminal 12 of the control circuit 22, which corresponds to rewinding. Output signals for starting the respective starting circuits 23 and 24 are output to the 12 starting circuits 24.
Then, as a result of activation of the activation circuit 23 of the plunger 12, the plunger 12 operates, and the idler support lever 1
The idler 15 supported by the pulley 14 presses against the pulley 14 and engages with the idler 15 supported by the pulley 14. At this time, the starting circuit 24 causes the motor 1 to
3 rotates clockwise, the idler 15 rotates counterclockwise, and along with this, the idler 15 is planetarily displaced around the pulley 14 in the clockwise direction in FIG. The reel base 16 is press-fitted and engaged with the reel stand 16 of. That is, at this time, the idler 15 is interposed between the pulley 14 and the reel stand 16. This idler 15 and reel stand 1
6, the rotation of the motor 13 is caused by the pressure contact with the reel stand 1.
6, the tape is rewound by the reel stand 16, and the slack in the tape 2a is removed. And in this case,
Since the reel stand 16'' on the winding side is not rotating, the potential of the capacitor C2 provided in the auto-stop circuit 27 is charged by the power supply voltage ■ linked to the operation of the tape recorder, and after a certain period of time (several seconds) ) reaches the potential B shown in FIG.

As a result, the logic circuit 29 is switched from the set state to the reset state, so that the supporting board 1 and the supporting lever 11 return to their original positions shown in FIG. 1, and the operation of the tape recorder is stopped. In other words, the operation is stopped. On the other hand, since the auto-stop signal is input to the input terminal 14, the transistor Q1 is turned on, which turns off the transistor Q2, and the output of the auto-stop signal is also stopped. As explained above, slack in the tape is removed. Next, a case will be described in which, for example, the fast forward switch S1 is closed and the tape is fast forwarded.

When the fast forward switch S1 is closed, the starting circuit 23 of the motor 13 is started, and the motor 13 rotates counterclockwise, while the starting circuit 24 of the plunger 12 is started, and the idler 15 and the pulley 4 are connected. engage. This results in
The idler 15 rotates counterclockwise in FIG. The tape 2a is transmitted to the reel stand 16'', and the tape 2a is fast-forwarded by counterclockwise rotation of the reel stand 6''.
In this case, due to the rotation of the reel stand 16'', the magnet 1
7 rotates, the waveform shaping circuit 28 from the detection element 19
The output signal is output. This output signal is shaped by the waveform shaping circuit 28 to become a rectangular wave A. This rectangular wave A is smoothed by the capacitor C1 and diodes Dl and D2 to become a sawtooth waveform A'', which is input to the transistor Q2. This sawtooth waveform A'' acts to constantly reduce the potential of the capacitor C2, so the reel stand 16''
During the rotation of the transistor Q2, the transistor Q2 is not turned on. That is, fast forwarding is performed until the tape 2a reaches its end. When the tape 2a reaches its end, the rotation of the reel stand 16'' is stopped, so that the output signal generated from the detection element 19 is no longer detected.

As a result, the power supply voltage V. As a result, the potential of the capacitor C2 reaches the potential B shown in FIG. 4 after a certain period of time, and the transistor Q2 is turned on. As a result, the transistor Q2 outputs an auto-stop signal to the input terminal L corresponding to the stop of the control circuit 22. ) input terminal! When the auto-stop signal is input, the tape recorder in the fast-forward state is brought to a stop state by a means not shown, and an output signal generated from the output terminal 04 corresponding to the stop turns on the transistor Q1 to turn on the tape recorder. 7 transistor Q2 is turned off by turning on transistor Q1, and generation of the auto-stop signal from transistor Q2 is stopped. Next, when the switch S2 corresponding to rewinding is activated, the starting circuits 23 and 24 are started, and the motor 1
rotates clockwise and the plunger 12 operates, so the tape recorder enters the rewinding state and the tape 2a
is rewound.

When the tape 2a reaches its end, the auto-stop circuit 27 causes the tape recorder to stop operating. Further, when the switch S3 corresponding to regeneration is closed, the starting circuit 25 of the motor 9 and the starting circuit 26 of the plunger 5 are started.

As a result, the tape recorder enters the playback state, and as the motor 9 rotates counterclockwise, the reel stand 7 rotates.
The recorded signal recorded on the tape 2a is reproduced. In this case, as described above, when the tape 2a reaches its end, the auto-stop circuit 27 causes the tape recorder to stop operating. Of course, when the switch S4 corresponding to stop is closed, the control circuit 22 causes the tape 2
The tape recorder stops operating during the conveyance of a.

In this embodiment, the time required to take up the slack in the tape is determined by the charging time of the capacitor C2, but it is of course not necessary to limit it to this if the circuit turns on the transistor Q2 after a certain period of time. be.

In addition, in this embodiment, only the case of taking up the slack in the tape wound on the reel on the supply side has been explained, but after rewinding the tape, fast forwarding is performed and the tape is wound on the reel on the take-up side. Of course, it is possible to take up the slack in the wound tape.

In the present invention, at 2 o'clock when the tape cassette is attached to the tape,
Since the pinch roller is pressed against the capstan to disable the running of the tape and then the tape is rewound to take up the slack in the tape, it is possible to reliably take up the slack in the tape.

Since there is no need to provide a balance means for reliably taking up slack in the tape, the structure is also simple.

Furthermore, since the tape recorder is configured to utilize an auto-stop circuit provided in the tape recorder to take up slack in the tape, it is clear that the configuration is further simplified.

[Brief explanation of the drawing]

FIG. 1 is a schematic plan view of a tape slack removing device for a cassette tape recorder according to the present invention, FIG. 2 is an electrical circuit diagram for operating the cassette tape recorder according to the present invention, and FIG. 3 is an output waveform from a waveform shaping circuit. Figure 4 shows the transistor Q2
FIG. 3 is an output waveform diagram input to the base of the . 3, 35...Pinch roller, 5,12...
... Plunger, 7, r ... Flywheel, 9
, 12... Motor, 15... Idler, 16, 16''... Reel stand, 17... Magnet, 19... Detection element, 20... ...Detection switch, 21... Electric circuit for operating the tape recorder, 22... Control circuit, 23, 25...
...Motor starting circuit, 24, 26...Plunger starting circuit, 27...Auto stop circuit,
29...Logic circuit.

Claims (1)

[Claims] 1. a detection switch for detecting a tape cassette mounted on a tape recorder; and means for pressing a pinch roller against a captan from a state where the tape recorder is inactive in response to an output signal of the detection switch to disable the tape from running;
Means for rewinding the tape by setting the tape recorder in a rewinding state when the tape cannot run, and means for returning the tape recorder from the rewinding state to the non-operating state of the tape recorder after a predetermined period of time has elapsed. A tape slack removing device for a tape recorder, characterized in that it is provided with: