JPS61229255A - Deck incorporating plural tape mechanisms - Google Patents

Abstract

PURPOSE:To facilitate speed setting of high and constant speeds with one variable resistor by adding a circuit consisting of series connection with a variable speed for speed setting, a fixed resistor connected in series with the variable resistor, and the series connection of a fixed resistor and a speed changeover switch in parallel with the former fixed resistor to a motor speed control circuit. CONSTITUTION:Resistors 8, 10 are considered as a combined resistor, a proper resistance is decided to provide the number of revolutions at the constant speed when a switch 12 is turned on and the number of revolutions at the constant speed is set by a variable resistor 9. When the switch 12 is turned off, the high speed setting is executed. That is, since the resistance value of the variable resistor 9 is set, the resistance value of the resistor 8 is decided necessarily. Since the resistors 8, 11 have a resistance value in matching with the constant speed number as the combined resistance, when the resistance value of the resistor 8 is decided, the resistance of the resistor 10 is decided by calculation. Thus, high speed is obtained by turning off the switch and a constant speed is obtained by turning on the switch.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a deck incorporating a plurality of tape mechanisms capable of high-speed dubbing.

2. Description of the Related Art In recent years, the market trend in decks such as radio cassette tape recorders and tape decks has been to shift to sets equipped with a plurality of tape mechanisms and capable of high-speed dubbing in addition to normal recording and playback. In this case, for example, 2
A deck with two built-in tape mechanisms uses two motors each, and because the tape running speeds of the two tape mechanisms must be precisely matched, they must be operated independently for constant-speed rotation and high-speed rotation. Two variable resistance elements are required to adjust the rotation speed.

A conventional multiple tape mechanism deck (hereinafter referred to as multiple deck) will be described below with reference to the drawings. Figure 3 is a configuration diagram of a conventional multiple deck.
A tape mechanism 2, a motor 4, a tape mechanism 3, and a motor 5 are each independently installed.

Each motor has a built-in speed control circuit as shown in FIG. 4, or is installed externally on the deck side printed circuit board.

Explaining FIG. 4, 6 is a speed control IC that compares the voltage applied to the input terminal minus a predetermined voltage and the voltage at the output terminal and controls the current flowing to the output terminal so that these become equal. Motors 4 and 5 are connected to the output end. 7 is a temperature-sensitive resistor for setting load fluctuations, and 8 and 9 are fixed resistors and variable resistors for setting high-speed rotation speed, which are connected between the positive terminal of the power supply and the input terminal (2) of the speed control IC 6. 1o and 11 are a fixed resistor and a variable resistor for setting the constant rotation speed, and are connected in parallel to the resistor 8. 12 is a one-contact switch for switching between high-speed rotation and constant-speed rotation.

The operation of the speed control circuit configured as above will be explained below. First, the speed of the motor is determined by the magnitude of the resistance value between the motor positive and the IC terminal 0, and the relationship is as shown in Figure 5. As the resistance value increases, the rotation speed increases, and as the resistance value decreases, the rotation speed increases. decreases. Next, the method of setting the motor speed in this circuit will be explained. The rotation speed on the high speed side is set by the variable resistor 9 when the switch 12 is in the off state. In the case of constant speed, after adjusting the high speed side, turn on switch 12 and add fixed resistor 1o and variable resistor 11 in parallel to fixed resistor 6. Lower the total resistance value between power supply plus and IC terminal 0 from K. A constant rotation speed is set by the variable resistor 11.

Problems to be Solved by the Invention However, with the circuit configuration and adjustment method described above, for example, for multiple decks of two or more, motors corresponding to the number of tape mechanisms are required, and it is difficult to perform recording, playback, high-speed dubbing, etc. From this point of view, the motor speed must be set very carefully in order to match the tape running speeds of each tape mechanism. Therefore, variable resistors for adjusting the rotation speed are also required independently for high speed and constant speed.

The important thing to note here is that the settings on the high-speed side can be rough. In other words, the constant speed side is, for example, 14
If you set it to 00 rpH, the high speed side will be 2x speed, 3x speed, 1x speed.
．． It may be 8 times faster, but the point is that it is possible to make very rough settings depending on the set side's convenience.

SUMMARY OF THE INVENTION In view of the above, an object of the present invention is to provide a multi-tape mechanism deck equipped with an inexpensive and simple rotation speed setting circuit for driving a plurality of tape mechanisms with one motor.

Means for Solving the Problem In order to achieve this object, the deck with a built-in multiple tape mechanism of the present invention has a variable resistor for speed setting, a fixed resistor connected in series with the variable resistor, and a fixed resistor connected in series with the variable resistor. A circuit in which a fixed resistor and a speed changeover switch 11 are connected in series is added in parallel to the above.

Effects According to the above configuration, the resistance value between the power supply plus and the IC terminal 0 can be changed by opening and closing the switch, thereby making it possible to set the motor speed of high speed or constant speed.

EXAMPLES Hereinafter, examples of the present invention will be described with reference to the drawings. FIG. 1 shows the structure of a deck with built-in multiple tape mechanisms according to the present invention.

A motor 13 is mounted on the tape mechanisms 2 and 3, and the motor 13 has a built-in speed control circuit as shown in FIG. 2, or is incorporated into the deck-side printed circuit board as an external device.

In FIG. 2, 7 is a temperature sensitive resistor, 8 is a fixed resistor, 9 is a variable resistor, and 10 is a fixed resistor connected in parallel to the resistor 8 via a switch 12.

Next, the operation of the speed setting method will be explained.

As shown in Figure 5, the rotation speed can be changed by the resistance value between the power supply positive terminal and the IC terminal No.
Considering and resistance 1o as a combined resistance, set an appropriate resistance value so that the rotation speed on the constant speed side is obtained when the switch 12 is in the on state, and accurately set the rotation speed on the constant speed side using the variable resistor 9. do.

This determines the resistance value of the variable resistor for setting the constant speed side, so next, set the high speed side with the switch 12 turned off.

That is, since the resistance value of the variable resistor 9 is set, the resistance value of the resistor 8 is necessarily determined. Furthermore, when determining the resistance value of variable resistor 9, resistor 8 and resistor 10 are considered to be a combined resistance, and the resistance value matches the constant rotation speed, so once the resistance value of resistor 8 is determined, the resistance value of resistor 1o can be determined by calculation. The resistance value can also be found.

Therefore, when the switch is off, the rotation speed is high, and when the switch is on, the rotation speed is constant. As described above, according to this embodiment, it is possible to eliminate the variable resistor for setting the high speed side, and moreover, it is possible to drive a plurality of tape mechanisms with one motor.

Effects of the Invention As described above, the present invention includes a variable resistor for speed setting in a motor speed control circuit, a fixed resistor connected in series with the variable resistor, and a fixed resistor connected in parallel with the fixed resistor.

By adding a circuit that connects a fixed resistor and a speed selector switch in series, high speed can be achieved with just one variable resistor.

It becomes easy to set constant speed. Therefore, if one motor is used for multiple decks that drive multiple tape mechanisms, the cost reduction effect will be significant.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the configuration of a deck with a built-in tape mechanism according to an embodiment of the present invention, FIG. 2 is a circuit diagram of the speed control circuit of the same motor, and FIG. 3 is a diagram of a conventional deck with a built-in tape mechanism. An explanatory diagram showing the configuration, Figure 4 is a circuit diagram of the speed control circuit of the motor, and Figure 6 is a diagram showing the power supply positive terminal and I
It is a characteristic diagram showing the relationship between the resistance value between C terminals 0 and the rotation speed. 2.3... Tape mechanism, 6...
Speed control ICl3...Fixed resistance, 9...
...Variable resistance, 1゜...Fixed resistance, 12...
...Speed switching switch, 13...Motor.

Claims (1)

[Claims] A speed control circuit for the motor includes a variable resistor for setting the speed, a fixed resistor connected in series with the variable resistor, and a fixed resistor connected in series with the variable resistor. A deck with a built-in multiple tape mechanism that is equipped with a speed control circuit that includes a fixed resistor and a speed changeover switch connected in series in parallel.