JPS5919973Y2 - tape recorder tape winding device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape winding device for a tape pull-out type tape recorder or other tape recorders that performs recording or playback by pressing tapes sequentially pulled out from a cassette against a group of heads.

The tape pull-out type tape recorder mentioned above is EL.
It is known as a cassette tape recorder, etc.
Such a tape recorder usually has a tape transport mechanism as shown in FIG.

That is, the tape 2 in the cassette 1 is pulled out of the cassette 1 by the loading pins 3, 3' during recording or reproduction.

Then, the tape 2 that has been pulled out is transferred to the head groups 4, 4'
, 4'', and is pinched by pinch rollers 5, 5' and capstans 6, 6' which are interlocked with loading pins 3, 3', and is transported in the direction of the illustrated arrow.

In addition, 7 is a tape winding reel, 8 is a rotary drive motor, 9 is a belt, 10.10' is a flywheel, 1
1 indicates a tape feeding reel.

In the pause (temporary stop) state, the pinch rollers 5, 5' are slightly separated from the capstan 6, 6', and neither the tape take-up reel 7 nor the tape feed reel 11 rotates. Therefore, tape 2 does not run.

Then, when the pause state is switched to the stop state, the pinch rollers 5 and 5' are stored in the cassette 1, and the tape portion that was pulled out to the head groups 4, 4', and 4'' side is moved outside the cassette 1. remain in the

Therefore, unless the tape portion is housed in the cassette 1 in some way, the tape will sag, causing various inconveniences.

In the tape winding device of this invention, for a certain period of time immediately after switching from the pause state to the to-stop state,
The tape winding reel 7 is rotated to eliminate slack in the tape.The tape winding device of this invention will be explained together with the embodiment shown in FIG.

In FIG. 2, the first inverter 13 whose signal input terminal is connected to the first signal terminal 12 connects its signal output terminal 14 to the first signal input terminal 16 of the NAND gate circuit 15 and the second inverter 17. Connected to the signal input terminal.

Further, a signal output terminal 18 of the second inverter 17 is connected to a second signal input terminal 21 of the NAND gate circuit 15 via a resistor 19 and a diode 20 connected in parallel to the resistor 19.

On the other hand, the first transistor 24 whose base is connected to the second signal terminal 22 via a resistor 23 has a resistor 25 connected between its base and emitter, and its collector is connected to the second signal input terminal of the NAND gate circuit 15. Connected to 21.

Further, a capacitor 26 is connected between the collector and emitter of the first transistor 24, and a collector of a second transistor 29 whose base is connected to the signal output terminal 27 of the NAND gate circuit 15 via a resistor 28, A base of a third transistor 31 is connected through a resistor 30, and a tape winding motor 32 is connected to a collector circuit of the third transistor 31.

The first signal terminal 12 is held high during the pause period.

However, it is held at a low level during non-pause periods.

Further, the second signal terminal 22 becomes high level during tape rewinding, but remains at low level during other periods.

Therefore, in the pause state, the first signal terminal 12
is at a high level, the signal output terminal 14 of the first inverter 13 is at a low level, the signal output terminal 18 of the second inverter 17 is at a high level, and the second signal terminal 22 is at a low level.

Also, since the first transistor 24 becomes non-conductive, N
The second signal input terminal 21 of the AND gate circuit 15 becomes high level, and the signal output terminal 27 of the NAND gate circuit 15 also becomes high level.

Therefore, both the second and third transistors 29 and 31 become non-conductive, and the tape winding motor 32 does not rotate.

Next, when the state is switched from the pause state to the stop state, the first. The second signal terminals 12 and 22 are both at a low level, and the first signal input terminal 16 of the NAND gate circuit 15 is at a high level.

Then, the signal output terminal 18 of the second inverter 17 shifts to a low level, and the capacitor 26 forming the charging/discharging circuit
The second signal input terminal 21 of the NAND gate circuit 15 remains at a high level for a certain period of time determined by the CR time constant of the resistor 19.

Therefore, the signal output terminal 27 of the NAND gate circuit 15 is at a low level for the predetermined period of time, and this pulse signal makes both the second and third transistors 29 and 31 conductive for a predetermined period of time, and the tape winding motor 32 makes a rotational movement.

That is, when the pause state is switched to the stop state, the pinch rollers 5 and 5' are stored in the cassette 1, and the tape portion that had been pulled out of the cassette 1 is wound around the tape winding knob 7. This prevents the tape 2 from becoming slack.

It goes without saying that the level switching at the first signal terminal 12 is performed by a switch linked to the pause mechanism.

Next, consider the case where the pause state is switched to the rewind state. At this time, the second signal terminal 22 becomes high level, the first transistor 24 becomes conductive, and the voltage between both terminals of the capacitor 26 becomes high. Short circuited.

Therefore, the second signal input terminal 21 of the NAND gate circuit 15 becomes low level, and the tape winding motor 32
does not rotate.

If the tape winding motor 32 rotates during tape rewinding, the tape 2 will be pulled from both ends, which is very dangerous.

As described above, according to the tape winding device of this invention, the first signal whose level is switched between the pause state and other operating states is applied to the first signal input terminal of the gate circuit, and the first signal is applied to the first signal input terminal of the gate circuit. A second signal having a level opposite to that of the first signal is applied to a second signal input terminal of the gate circuit through a resistor, and is formed by a capacitor connected to the second signal input terminal and the resistor. Due to the CR time constant of the charging/discharging circuit, the level of the second signal input terminal immediately after switching from the pause state to the stop state is temporarily maintained near the level during the pause state, and within this period, the level of the second signal input terminal By rotating the tape winding motor in response to a pulse signal output from the circuit, it is possible to completely prevent the tape from sagging immediately after the pause state is released. When applied, excellent results can be obtained.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a tape transport mechanism of a tape pull-out type tape recorder, and FIG. 2 is an electrical circuit diagram of an embodiment of a tape winding device for a tape recorder of this invention. 15... NAND gate circuit, 16... First signal input terminal, 21... Second signal input terminal, 19... Resistor, 26... Condenser, 32... For tape winding motor.

Claims (1)

[Scope of utility model registration request] A first signal whose level is switched between a pause state and other operating states is applied to the first signal input terminal of the gate circuit, and a second signal whose level is opposite to that of the first signal is applied to the first signal input terminal of the gate circuit. C of a charging/discharging circuit formed by a capacitor connected to the second signal input terminal and the resistor, which is applied to the second signal input terminal of the gate circuit through the resistor.
The level of the second signal input terminal immediately after switching from the pause state to the stop state is determined by the R time constant.
The pulse signal is temporarily held near the pause state level and output from the gate circuit within this period.
A tape winding device for a tape recorder, characterized in that a tape winding motor is rotated.