JPH0581731A - Magnetic recording/reproducing device - Google Patents

Abstract

PURPOSE:To detect the moisture of a rotary drum quickly and surely and then to start travelling a tape after the moisture stuck to the drum disappears by displacing a dew sensor to the vicinity of the rotary drum when the water content of the rotary drum is detected and to the position difficult to be dried after the moisture is detected. CONSTITUTION:When a tape cassette is loaded, a loading motor 13 is rotated in a clockwise direction, gears 151, and 152 are rotated to a loading side via a rotation transmission mechanism 14, inlet and outlet post units 181 and 182 are moved in the direction of an arrow A along guide grooves 171 and 172, the tape is pulled out from the tape cassette and wound to a rotary drum 11. In accordance with the rotations of the gears 151 and 152, an arm 23 is rotated in the direction of an arrow C, a dew sensor 20 is positioned on the vicinity of the drum 11 and the sticking of the moisture to the drum 11 is detected. Based on the detected signal, a tape travelling prohibit signal is sent to a loading mechanism 12, the motor 13 is slightly moved in an anti-clockwise direction and a sensor 20 is moved to the position at the lower side of a chassis 10 where a drying is difficult by the rotations of the gears 151 and 152.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to water (dew) on a rotating drum.
The present invention relates to a magnetic recording / reproducing apparatus having a du sensor for detecting the.

[0002]

2. Description of the Related Art Conventionally, a magnetic recording / reproducing apparatus is known in which a du sensor detects whether or not water is attached to a rotary drum, and the tape running operation of a loading mechanism is controlled based on the detection result. is there. FIG. 7 is a plan view showing a conventional magnetic recording / reproducing apparatus. That is, the magnetic recording / reproducing apparatus includes the chassis 1, and the rotating drum 2 is rotatably provided on the chassis 1.
A du sensor 3 is fixed on the chassis 1 in the vicinity of the rotary drum 2. The du sensor 3 is for detecting whether or not moisture is attached to the rotary drum 2. Further, the chassis 1 is provided with a loading mechanism 4. The loading mechanism 4 has an inlet post unit 5 and an outlet post unit 6 for pulling out a tape in a tape cassette (not shown) and winding the tape around the rotary drum 2. Then, when the tape cassette is loaded at a predetermined position on the pair of reels 6 ₁ and 6 ₂ on the chassis 1, the loading motor 7 rotates in one direction, and the inlet post unit 5 and the outlet post unit 6 move in the direction of arrow A. The tape is pulled out from the tape cassette by moving in the direction, and the tape is wound around the rotary drum 2. If the moisture of the rotary drum 2 is not detected by the du sensor 3 in this state, the tape is run in a predetermined direction to perform a normal recording or reproducing operation.

However, due to the du sensor 3, the rotary drum 2
When it is detected that the water adheres to the rotary drum 2, the tape running operation by the loading mechanism 4 is prohibited until the water adhered to the rotary drum 2 is removed by the signal from the du sensor 3.

After that, when it is detected by the du sensor 3 that no water is attached to the rotating drum 2, the prohibition of the tape running operation to the loading mechanism 4 is released by the signal from the du sensor 3, and the tape is moved in a predetermined direction. The recording / reproducing operation is normally performed by traveling to.

[0005]

However, in such a conventional magnetic recording / reproducing apparatus, the du sensor 3 is used.
Is located near the rotary drum 2 and is fixed to the upper surface of the chassis 1. Therefore, the moisture of the rotary drum 2 can be detected quickly, but the drying of the du sensor 3 after the moisture detection is promoted. When the du sensor 3 dries even though water is still attached to 2, the prohibition of the tape running operation on the loading mechanism 4 is released, and a problem such as a tape error or a tape damage occurs.

Therefore, in order to solve such a problem, a microcomputer is built in, and when the moisture of the rotary drum 2 is detected by the du sensor 3, the tape running operation to the loading mechanism 4 is prohibited until a predetermined time elapses. A means to do is possible. However, such a means does not function if the power is turned off carelessly, so that the above-mentioned problems cannot be reliably solved.

In addition, the position where the du sensor 3 is difficult to dry,
For example, if it is installed at a deep position on the lower surface of the chassis 1, the time when the prohibition of the tape running operation for the loading mechanism 4 is released after the water content of the rotary drum 2 is detected, but the water content of the rotary drum 2 by the du sensor 3 can be delayed. Since the detection is not performed promptly, problems such as tape error or tape damage occur.

The present invention has been made to solve the above problems, and it is quick when moisture in the rotary drum is detected, and after the moisture is detected, the moisture adhering to the rotary drum is completely removed. It is an object of the present invention to provide a magnetic recording / reproducing apparatus capable of canceling the prohibition of the tape running operation to the loading mechanism in the state.

[0009]

In order to achieve the above object, the magnetic recording / reproducing apparatus of the present invention has a movable du sensor for detecting moisture, and when detecting moisture on a rotary drum, the du sensor is placed near the rotary drum. After the water content of the rotary drum is detected, the du sensor is displaced to a position where it is difficult to dry.

[0010]

The du sensor moves to the vicinity of the rotary drum when the moisture of the rotary drum is detected, and moves to a position where it is difficult to dry after the moisture of the rotary drum is detected.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a plan view of a magnetic recording / reproducing apparatus according to an embodiment of the present invention. In FIG. 1, 10 is a chassis on which a rotary drum 11 is rotatably provided. .. Further, the chassis 10 is provided with a loading mechanism 12. This loading mechanism 12
As shown in FIG. 2, a loading motor 1 that can rotate forward and backward
3, a pair of gears 15 ₁ and 15 ₂ meshed with each other, which are normally and reversely rotated by the loading motor 13 through the rotation transmission mechanism 14, and link mechanisms 16 ₁ and 16 ₂ to the both gears 15 ₁ and 15 _2. And both gears 15
_The inlet post unit 18 ₁ and the outlet post unit 1 that move in the directions of arrows A and B in FIG. 2 along the guide grooves 17 ₁ and 17 ₂ provided in the chassis 1 with the rotation of ₁ and 15 ₂ .
8 ₂ and.

A pair of reel stands 19 ₁ and 19 ₂ are rotatably provided on the chassis 10. Then, when a tape cassette (not shown) is loaded at a predetermined position on the reel bases 19 ₁ and 19 ₂ , the loading motor 13 rotates in one direction, and accordingly, the gears 15 ₁ , 15 ₂ rotates to the loading side. As a result, the entrance post unit 18 ₁ and the exit post unit 18 ₂ move in the direction of arrow A, so that the tape in the tape cassette is pulled out and the rotary drum 11
It is wound around and is run in a predetermined direction.

A du sensor 20 is movably provided on the lower surface side of the chassis 10 located near the rotary drum 11. The du sensor 20 is for detecting whether or not water is attached to the rotary drum 11.

That is, as shown in FIGS. 3 to 6, the du sensor 20 has a rotating arm in which a substantially intermediate portion is attached to a bracket 21 provided on the lower surface of the chassis 10 by a shaft 22 so as to be rotatable in the directions of arrows C and D. It is fixed to the upper surface of the tip portion 23a of 23. The du sensor 20 is exposed through a window hole 24 formed in the chassis 10. The rotating arm 23 is urged to rotate in the direction of arrow D by a spring 25.

A pressing protrusion 26 is provided on the lower surface of one gear 15 _2.
Is projected. When the gear 15 ₂ rotates to the loading side by a predetermined angle, the pressing protrusion 26 presses the base end portion 23b of the rotating arm 23. As a result, the rotating arm 23 rotates in the direction of arrow C against the urging force of the spring 25, and the du sensor 20 projects above the chassis 10 through the window hole 24 and is positioned near the rotating drum 11. It is supposed to do.

Next, the operation of the magnetic recording / reproducing apparatus having the above structure will be described.

First, when a tape cassette (not shown) is loaded at a predetermined position on the reel bases 19 ₁ and 19 ₂ , the loading motor 13 rotates clockwise in FIGS. 1 and 2, and the rotation transmission mechanism 14 is used. The gears 15 ₁ and 15 ₂ rotate from the initial position toward the loading side by a predetermined angle (approximately 180 °). As the gears 15 ₁ and 15 ₂ rotate, the inlet post unit 18 ₁ and the outlet post unit 18 ₂ move in the arrow A direction in FIG. 2 along the guide grooves 17 ₁ and 17 ₂ , respectively. As a result, the tape is pulled out from the tape cassette and wound around the rotary drum 11. In this state, the detection result of the du sensor 20 is waited, and based on the result, it is determined whether or not to prohibit the tape running operation.

That is, as the gears 15 ₁ and 15 ₂ rotate from the initial position toward the loading side by a predetermined angle (approximately 180 °), the pressing protrusion 26 of the gear 15 ₂ causes the base end 23b of the rotating arm 23 to move. Press. As a result, this rotating arm 2
3 rotates in the direction of arrow C in FIG. 4 against the urging force of the spring 25, and the du sensor 20 passes through the window hole 24 and the chassis 10 moves.
And is located near the rotary drum 11 (see FIG. 5).
Condition). In this state, the du sensor 20 detects whether or not water is attached to the rotary drum 11.

When the du sensor 20 detects that water is attached to the rotary drum 11, a signal for prohibiting the tape running operation is output to the loading mechanism 12 based on the detection signal. At the same time, the loading motor 13 is slightly rotated counterclockwise in FIGS. 1 and 2. This allows the entrance post unit 1
8 ₁ and the exit post unit 18 ₂ are in the direction of arrow B, that is,
It is moved a little to the unloading side. Therefore, the tension on the tape is relaxed.

The loading motor 13 is shown in FIG.
Also, as shown in FIG. 2, the gears 15 ₁ and 15 ₂ rotate toward the unloading side as they rotate counterclockwise. Thus, the rotating arm by the pressing protrusion 26 of the gear 15 ₂ 2
When the pressing force of 3 is released, the rotating arm 23 moves in the direction of arrow D in FIG.
0 moves to a position on the lower surface side of the chassis 10 where it is difficult to dry, and becomes the state shown in FIG.

After this, with the passage of time, when the water adhering to the rotary drum 11 disappears, the du sensor 20 also dries. Therefore, when the moisture adhering to the rotary drum 11 disappears, the du sensor 20 also dries, so that the loading motor 13 again slightly rotates clockwise in FIGS. 1 and 2, and the inlet post unit 18 ₁ and the outlet post unit 18 ₁ 1
8 ₂ is slightly moved in the direction of arrow A, the tape is wound around the rotary drum 11 with a predetermined tension and is run in a predetermined direction to perform a recording or reproducing operation.

Further, if the moisture of the rotary drum 11 is not detected by the du sensor 20, the loading mechanism 12
The tape running operation for the tape is not prohibited, and the tape is wound in the predetermined direction immediately after being wound around the rotary drum 11 to perform the recording or reproducing operation.

After the recording or reproducing operation is completed, the loading motor 13 is rotated to the unloading side to move the inlet side post unit 18 ₁ and the outlet side post unit 18 _{2 in the} direction of arrow B, and Is stored in the tape cassette and returns to the initial state.

In the above embodiment, the drive source for moving the du sensor 20 is common to the drive source of the loading mechanism 12 (loading motor 13), but the present invention is not limited to this, and the du sensor 20 may be used. The drive source may be separated from the drive source of the loading mechanism 12 by being moved by an external switch or the like.

[0026]

As described above, according to the magnetic recording / reproducing apparatus of the present invention, the water content of the rotary drum can be detected accurately and quickly, and after the water content detection, the water content attached to the rotary drum is completely removed. Since the tape running operation can be started after it disappears, it is possible to reliably prevent a tape error or a tape damage.

[Brief description of drawings]

FIG. 1 is a plan view of a magnetic recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a plan view showing a loading mechanism of the apparatus.

FIG. 3 is a plan view showing a du sensor section of the same device.

FIG. 4 is an operation explanatory diagram of a du sensor unit of the same apparatus.

FIG. 5 is an operation explanatory diagram of a du sensor unit of the same apparatus.

6 is an exploded perspective view as seen from the direction of arrow E in FIG.

FIG. 7 is a plan view of a conventional magnetic recording / reproducing apparatus.

[Explanation of symbols]

 11 rotating drum 12 loading mechanism 13 loading motor (driving source) 20 du sensor

Claims (2)

[Claims] 1. A loading mechanism for loading a tape cassette at a predetermined position, pulling out the tape in the cassette, winding the tape around a rotary drum, and running the tape in a predetermined direction; and a du sensor for detecting moisture in the rotary drum. In a magnetic recording / reproducing apparatus in which the tape traveling operation by the loading mechanism is prohibited when the water content of the rotary drum is detected by the du sensor, when the water content of the rotary drum is detected by making the du sensor movable. The magnetic recording / reproducing apparatus is characterized in that the du sensor is displaced in the vicinity of the rotary drum to a position where it is difficult to dry after the water content of the rotary drum is detected. 2. The magnetic recording / reproducing apparatus according to claim 1, wherein a drive source for moving the du sensor is common to a drive source of the loading mechanism.