JPS6161454B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a switch switching device in a tape recorder such as a reverse stereo cassette deck, and more particularly to a switch switching mechanism between forward (FWD) and reverse (REV).

Conventionally, the first type of switch switching device of this type was
A device having a configuration as shown in FIGS. 2 and 2 is known.

In Figure 1, 18 is provided on the amplifier side.
This is a slide switch for FWD/REV switching. 2
3 is a plunger for the FWD mode, and 3 is a plunger for the REV mode. These are respectively connected to both ends of a lever 4 whose intermediate portion is pivotally supported, and the lever 4 and the contact piece 5 of the switching slide switch 18 are connected to the traction member 6. They are connected together.

Therefore, for example, when a FWD mode plunger drive signal is output from the tape running control section (not shown), the FWD mode plunger 2 is energized based on the drive signal, and the REV mode plunger 3 is de-energized. Since it is in the state, lever 4
The lever 4 is rotated so that the right end of the switch is pulled toward the FWD mode plunger 2, and accordingly, each contact piece 5 of the switching slide switch 18 is disposed on the FWD side. As a result, the switch mode on the amplifier side is also maintained in the FWD mode, similar to the operating mode of the drive unit (in this case, the FWD mode plunger 2).

Next, when the REV mode plunger drive signal is output from the tape running control section, the REV mode plunger 3 is energized based on the drive signal, while the FWD mode plunger 2 is de-energized. The lever 4 rotates so that the left side of the lever 4 is pulled toward the REV mode plunger 3, and each contact piece 5 moves to the REV mode.
placed on the side. As a result, the switch mode is also driven by the drive unit (in this case plunger 3 for REV mode).
Switches to REV mode in the same way as the operating mode.

In addition to switching the slide switch 18 on the amplifier side, the plungers 2 and 3 are also used for operations such as switching the head track or pressing the pinch roller against the capstan during REV or FWD.

The switch switching device with this configuration uses a slide switch that can maintain the position of the contact piece 5 by energizing and de-energizing the plungers 2 and 3, so the previous mode can be memorized when the power is turned on. Turn on the power at the time specified by the timer,
This is advantageous for so-called continuous absence recording, which is recorded intermittently by turning off. However, since the switching slide switch 18 and the plungers 2 and 3 are mechanically connected together, a time lag can be created between the operating timing of the switching slide switch 18 and the plungers 2 and 3. First, it is not suitable for cases where it is desired to shift the operating timing of the switch and plunger for control purposes, and there is no margin for operating timing. It also has the disadvantage that noise is likely to be generated due to the rotation of the lever 4 or the movement of the traction member 6.

In the switch changeover device shown in FIG. 2, reference numeral 7 denotes an operating section, which is provided with a plurality of predetermined operating levers such as a forward lever 8, a reverse lever 9, a stop lever 10, and a record lever 11. By operating these levers, a desired operating mode is selected. can be input to the tape running control section 12. The tape running control section 12 processes the key signal from the operation section 7,
Signals can be output to various parts such as the FWD mode plunger 2, the REV mode plunger 3, the switch switching relay 13, the mute mechanism, and the amplifier side transmitter.

An electric switch is used for each of the changeover switches 14 on the amplifier side, and when the power is not turned on, the contacts of the changeover switches 14 are always biased toward the REV side. During FWD, the tape running control section 12
The FWD mode plunger 2 is driven by the drive signal from the FWD mode plunger 2, and the relay 13 is activated to shift the contact piece of the changeover switch 14 to the FWD side, thereby maintaining the switch mode in the FWD mode. On the other hand, during REV, the REV mode plunger 3 is driven, the relay 13 is turned off, and the contact piece of the changeover switch 14 is energized.
It has a mechanism that allows you to return it to the REV side and change the switch mode to REV mode.

However, with this switch switching device, when the power is not turned on, the contact of the amplifier side changeover switch 14 is always biased to one mode side, so it is not possible to memorize the mode before the power is turned on. is not suitable. Therefore, in a device equipped with an intermittent absence recording mechanism, it is necessary to separately provide a mechanical switch for storing FWD/REV, which is disadvantageous because the circuit and structure are complicated and the cost is high.

In order to improve these problems, a switch changeover device having a structure as shown in FIG. 3 can be considered. That is, in this device, a self-locking slide switch 1, a FWD mode plunger 2, and a REV mode plunger 3 are separate. A switching plunger 15 is provided between the switching slide switch 1 and the tape running control section 12, and the switch mode is reversed each time the plunger 15 is excited.

This switch switching device uses a self-locking slide switch 1, so
The mode before the power is turned on is memorized, making it suitable for recording intermittent absences, and there is only one slide switch for switching.
Since the drive plungers 2 and 3 are separate from each other, it has advantages such as being able to shift the operation timing depending on the control mode, but it is not without its drawbacks. In other words, since the slide switch 1 can be switched by an external shock or intentionally,
In particular, if slide switch 1 switches to REV mode during FWD recording, problems such as erasing the recorded contents of other channels will occur, and the mode of plungers 2 and 3 and the switch mode will be reversed semi-permanently. I get used to it.

The present invention eliminates these drawbacks, and
An example will be described with reference to FIGS. 4 and 5.

The switch switching device mainly includes a switching slide switch 1 on the amplifier side, a plunger 2 for FWD mode, a plunger 3 for REV mode, an operation part 7,
It is comprised of a tape running control section 12, a switching plunger 15, a comparison/judgment circuit 16, a delay circuit 17, and the like.

The switching slide switch 1 can self-lock for each mode, and has a mechanism in which the switch modes are sequentially and alternately changed by the operation of a dedicated switch switching plunger 15.

The operating section 7 includes a forward lever 8, a reverse lever 9, a stop lever 10, and a record lever 1.
A plurality of predetermined operation levers such as 1 are provided, and a desired operation mode can be input to the tape running control section 12 by operating these levers. The tape running control section 12 processes the key signal from the operation section 7 and controls the FWD mode plunger 2 and REV.
Signals can be output to various parts such as the mode plunger 3, the switch changeover plunger 15, the miute mechanism, and the amplifier side transmitter.

Since the plunger 15 for switching the switch is provided, the plungers 2 and 3 perform functions other than switching the switch, such as switching the track of the head and pressing the pinch roller against the capstan.

The comparison circuit 16 has a function of comparing and determining whether or not the FWD or REV operation mode based on the input operation on the operation unit 7 matches the FWD or REV switch mode of the changeover slide switch 1. have.

In other words, if the slide switch 1 on the amplifier side switches due to some kind of shock while using the cassette deck, or if the switch does not switch to the specified mode due to malfunction, for example, the operation mode may be changed to FWD. The switch mode may be set to REV mode even though it is in REV mode. When both modes are different in this way, the first NAND gate NAND of the comparison/judgment circuit 16
The output of the first or second NAND gate NAND2 becomes "L", this judgment signal is input to the operation unit 7, the stop key is pulled based on the input signal, and as a result, the operation mode is automatically switched to the stop mode. This prevents malfunctions.

The delay circuit 17 controls the FWD/
When switching the REV, until the switching slide switch 1 on the amplifier side is completely switched,
This is to prevent the outputs of the first NAND gate NAND1 and the second NAND gate NAND2 from becoming "L".

Although not shown in FIG. 4, each of the plungers 2, 3, and 15 is provided with a plunger drive circuit.

When the mode is switched to the stop mode based on the judgment result of the comparison judgment circuit 16 as described above, the tape running control section 12 detects whether the switching slide switch 1 is currently in the FWD mode or the REV mode. . If the next input mode at the operating section 7 and the switch mode at the current point are the same, no drive signal is output from the tape running control section 12 to the switch switching plunger 15. On the other hand, if the input mode on the operation section 7 and the switch mode are different, the tape running control section 12
A drive signal is output from the switch, and the switch mode is reversed to become the same as the input mode.

That is, if the switch mode at the time of switching to the stop mode is, for example, the FWD mode, and the input mode of the operation unit 7 is the FWD mode, the switch mode is maintained as it is. On the other hand, if the input mode of the operating section 7 is the REV mode, a drive signal is output to the switch switching plunger 15, and the switch mode is switched from the FWD mode to the REV mode. Also, the switch mode at the time of switching to stop mode is
In the REV mode, if the input mode of the operation unit 7 is the REV mode, the switch mode is maintained as it is, and on the other hand, if the input mode of the operation unit 7 is the FWD mode, the switch mode is driven to the switch switching plunger 15. A signal is output and the switch mode is changed from REV mode to FWD mode.

By adopting such a control system, after switching to stop mode, by making a new input operation on the operation unit 7, the operation mode and the switch mode on the amplifier side will automatically become the same, allowing normal operation. will be carried out.

FIG. 5 is a diagram showing a specific circuit configuration for implementing the above-described control system. 19 in the figure is a circuit for pulling the stop key when the power is turned on, and when the power is turned on or stopped, the 5th NAND gate
The output of NAND5 is held at "L".

Due to the FWD operation on the operation unit 7, the output of the third NAND gate NAND3 becomes “H” and the output of the fourth NAND gate
The output of NAND4 becomes "L", and the output of the fifth NAND gate NAND5 becomes "H" through diode D.
This state will be maintained. On the other hand, due to the REV operation, the output of the fourth NAND gate NAND4 and the output of the fifth NAND gate NAND5 become "H".

When FWD is operated, if the switch mode is REV mode, transistor Q1 is off and transistor Q2 is on, so all inputs of the seventh NAND gate NAND7 become "H".
The switching plunger 15 is momentarily excited through the inverter NOTH1. This excitation time is determined by the time constant of capacitor C1. The changeover slide switch 1 is switched to the FWD side by the operation of the plunger 15. At this time, the transistor Q1 is turned on, and as a result, one of the inputs of the seventh NAND gate NAND7 becomes "L", and the excitation of the plunger 15 is stopped midway, so that the plunger 15 cannot be fully pulled out.
Therefore, the changeover slide switch 1 may not be locked to the FWD side and may return to the REV side. The capacitor C2 constitutes a delay circuit to prevent this malfunction, and even when the slide switch 1 is switched from REV to FWD, the transistor Q1 is not turned on until the capacitor C2 is charged.

When FWD is operated, if the switch mode is FWD mode, the transistor Q1 is on, so one input of the seventh NAND gate NAND7 becomes "L" and the plunger 15 does not operate.

Similarly, in the case of the REV operation, if the switch mode is different, the switch mode is changed to the REV mode by the plunger 15 through the eighth NAND gate NAND8 and the inverter NOT2.

As mentioned above, the present invention includes an operation section that allows input of a desired operation mode such as FWD or REV, and a cell lock provided on the amplifier side.
A FWD/REV changeover switch, a changeover drive means such as a plunger for performing the changeover operation of the switch, and an operation signal from the operation section is inputted, and a drive signal is sent to the drive section such as the changeover drive means according to the operation mode. and a comparison and determination means for comparing and determining whether or not the operation mode based on the input operation on the operation section matches the switch mode of the changeover switch, the comparison and determination means If the operation mode and the switch mode are different as a result of the determination, the operation mode is automatically switched to the stop mode based on the determination signal from the comparison and determination means. Therefore, malfunctions such as erasure of recorded contents on other channels can be prevented, and a highly reliable tape recorder can be provided.

[Brief explanation of the drawing]

1 and 2 are schematic diagrams of a conventional switch switching device, FIG. 3 is a schematic diagram of another switch switching device, and FIG. 4 is a schematic diagram of a switch switching device according to an embodiment of the present invention. , FIG. 5 is a control circuit diagram for controlling the switching of the amplifier side changeover switch in the switch changeover device. DESCRIPTION OF SYMBOLS 1...Slide switch for switching, 7...Operation unit, 12...Tape running control unit, 15...Plunger for switching switch, 16...Comparison judgment circuit.

Claims (1)

[Claims] 1. An operating section that allows inputting a desired operating mode such as forward or reverse, a self-locking forward/reverse changeover switch provided on the amplifier side, and a switching drive means for switching the switch; a tape running control section that inputs an operation signal from an operation section and outputs a drive signal to a drive section such as the switching drive means according to an operation mode; and a comparison judgment means for comparing and judging whether or not the operation mode and the switch mode match. 1. A switch switching device for a tape recorder, characterized in that the operating mode is configured to automatically switch to a stop mode.