JPS6242343B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cartridge type tape recorder, and is particularly designed to prevent the tape from sagging when the tape is stopped from fast-forwarding.

As shown in Fig. 1, in a tape cartridge in which tapes 2 are stored in a cartridge case 1 in an endless manner, the tape 2 is fast-forwarded at a high speed of about 10 times the tape speed during playback. It may be. However, when the pinch roller 3 and the capstan 4 are stopped immediately after being fast-forwarded at a high speed, the tape 2 is connected to the reel 5 due to the inertia of the reel 5 and the slack of the tape 2. The tape 2 stopped while being drawn into the gap between the guides 6, and then when it was fast-forwarded again at high speed, the drawn-in tape 2 was suddenly pulled and the tape 2 was bent.
Often damaged.

The present invention eliminates these conventional drawbacks, and one embodiment thereof will be described below with reference to FIG. 2.

Reference numeral 7 denotes a flip-flop circuit whose Q output becomes H level when the tape is fast forwarded, and becomes L level when the tape is stopped. The Q output of the flip-flop circuit 7 is connected to transistors 9a and 9a through a resistor 8.
It is designed to control a first switching circuit 9 consisting of a transistor 9b, and also to control a second switching circuit 12 consisting of transistors 12a and 12b via a diode 10 and a resistor 11. Further, the second switching circuit 12 is configured to be controlled in operation by a time constant circuit 13 consisting of a capacitor 13a and a resistor 13b. 14 is a motor for running the tape, and the motor 14 is connected between the power supply 15 and the ground.
It is connected in series with the switching circuit 9 of
Further, a series circuit of a resistor 16 and a second switching circuit 12 is connected in parallel with the first switching circuit 9.

With the above configuration, when a fast forward operation is performed, the Q output of the flip-flop circuit 7 becomes H level, which turns on the first switching circuit 9, starts the motor 14, and rotates the capstan at high speed. This allows the tape to be fast-forwarded at high speed.

On the other hand, the H level of the flip-flop circuit 7 charges the capacitor 13a of the time constant circuit 13 via the diode 10, and turns on the second switching circuit 12 via the resistor 11.

Then, when a stop operation is performed to stop the rapid forwarding operation, the Q output of the flip-flop circuit 7 becomes L level, thereby turning off the first switching circuit 9 and causing the motor 14 to rapidly stop rotating. However, the second switching circuit 12 remains on for a period of time determined by the time constant circuit 13, and during this time, the current limited by the resistor 16 flows through the motor 14, and the motor 1
4 maintains a low speed rotation state for a certain period of time and then stops.

Therefore, even when a stop operation is performed, tape running does not stop abruptly, but moves to low-speed running for a short time and then stops, and the tape is not drawn between the reel and tape guide. It is.

It goes without saying that the time constant circuit 13 and the resistor 16 are set to values that will allow the tape to stop smoothly and safely.

As described above, the present invention has a simple structure that enables smooth and stable stopping operation when the tape is stopped from high-speed fast forwarding, and has great practicality.

[Brief explanation of the drawing]

FIG. 1 is a schematic internal view of a tape cartridge, and FIG. 2 is a circuit diagram of an embodiment of the present invention. 7...Flip-flop circuit, 9...First switching circuit, 12...Second switching circuit, 13...Time constant circuit, 14...Motor, 16
……resistance.

Claims (1)

[Claims] 1. A first switching circuit that controls a tape running motor, a series circuit consisting of a current limiting resistor and a second switching circuit connected in parallel with the first switching circuit, and the second switching circuit. Equipped with a time constant circuit to control the operation of
The first and second switching circuits are turned on when the tape is fast-forwarded, and both switching circuits are turned off when the tape is stopped, and when the tape is stopped, the second switching circuit is turned off after being delayed for a certain period of time by a time constant circuit. During this time, the motor is rotated at a low speed via a current limiting resistor.