JPH0237131Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a control device for a tape recorder that automatically removes slack in the tape when a cassette half is loaded into the tape recorder.

The tape slack remover is automatically started when the cassette half is loaded into the tape recorder, and sends a signal that removes the tape slack, such as stopping the reel stand.
The rotation of the reel stand is stopped in response to a signal that detects tape tension, etc., or after a certain period of time has elapsed from the start of tape slack removal. If you perform the eject operation before the ejecting time has passed, that is, while the reel stand is rotating, an abnormal noise such as a rasping sound may occur, or the pawl on the cassette drive pin of the reel stand may become wedged in the hub of the cassette half and become unable to be removed. This may cause damage to the parts.

This idea was made in view of the points mentioned above.
The purpose of this is to provide a control device for a tape recorder that, even when the tape slack removing device is in operation, can be stopped immediately by ejecting the device, and the cassette half can be removed quickly and reliably. It is on offer.

Next, an embodiment of the present invention will be described with reference to the drawings.

S ₁ is an ejector switch that is turned on for a short time when the eject operation is performed, S ₂ is a half detection switch that is turned off when a cassette half is loaded into the tape recorder, and M is a switch that turns the tape in the winding direction when loading a cassette half. Reel motor that rotates the reel stand, R ₁ and C ₁ are first time constant circuits, R ₂ and C ₂
is a second time constant circuit, which turns off the transistor _Q3 in, for example, 2 seconds. That is, in this embodiment, the reel motor M rotates for two seconds after loading the cassette half to remove slack in the tape, and one side of the reel stand is stopped by a brake device, and the reel motor M rotates one side for two seconds after loading the cassette half. The tape is wound in this direction to remove slack in the tape. Note that Q ₁ to _{Q 4} are switching transistors.

Next, the operation will be explained based on the above circuit and the timing chart of FIG. 2. When a cassette half is loaded into the tape recorder, the half detection switch _S2 is turned off. This results in a transistor
Q ₂ is turned off, transistor Q 3 is turned on, and transistor _{Q 4 is} also turned on until the capacitor C ₂ of the second time constant circuit is charged with a predetermined charge (2 seconds). Therefore, the reel motor M is energized and the reel stand rotates in the direction of winding the tape, thereby removing slack in the tape. On the other hand, since the eject switch _S1 is off, the transistor _Q1 is off, and therefore no eject signal is sent out.

After the time constant by the second time constant circuit, the transistor _Q3 is turned off, the transistor _Q4 is also turned off, the reel motor M is stopped, and the tape slack removal operation is completed.

By the way, during the above-mentioned tape slack removal operation, that is, while the reel motor M is rotating, the eject switch S ₁
When the capacitor C1 is closed for a short period of time, at the same time as the capacitor _C1 is closed, the charge stored in the capacitor _C1 is instantly discharged and the transistor _Q1 is turned on. Transistor Q ₁ continues to be in the on state until capacitor C ₁ is charged with a predetermined charge. When the transistor Q ₁ turns on, the transistor Q ₂ also turns on,
Therefore, transistor Q ₃ is immediately turned off, and transistor Q ₄ is also turned off. As a result, the reel motor M also stops, so the reel motor M stops before the ejecting mechanism operates according to the ejecting command, and therefore, the hub of the cassette half and the claw of the reel stand do not engage. The cassette half can be taken out quickly and reliably.

In the above embodiment, the reel motor M is stopped depending on the time, but the reel motor M is stopped by turning off the transistors Q ₃ and Q ₄ in response to a signal from another tape slack removal completion detection means. Of course, it is also a good thing.

As mentioned above, this device immediately stops the rotation of the reel motor when the eject operation is performed during the tape slack removal operation, which eliminates the biting between the hub of the cassette half and the claw of the reel stand, thus eliminating the problem of the conventional eject operation. This prevents the occurrence of abnormal noises and damage to parts.

[Brief explanation of drawings]

The figures show an embodiment of a tape recorder control device according to this invention, with FIG. 1 being a circuit diagram and FIG. 2 being a timing chart. _S1 ...Eject switch, _S2 ...Half detection switch, M...Reel motor, _Q1 to _Q4 ...Switching transistor.

Claims (1)

[Scope of Claim for Utility Model Registration] A reel motor that rotates the reel stand of a tape recorder in the winding direction, half detection means that detects that a cassette half is loaded, and a detection output signal from the half detection means is input. a first control means for performing a tape slack removal operation by outputting a motor drive signal to the reel motor for a predetermined period of time from the time when the tape is removed until the tape slack is removed; an eject detection means for detecting that the eject has been ejected; and receiving a detection output signal from the ejection detection means, outputting a signal to the first control means to cut off the motor drive signal, and performing the tape slack removal operation. A control device for a tape recorder, comprising: second control means for stopping the tape recorder.