JPH09282839A - Magnetic recording and reproducing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic recording and reproducing apparatus having a tape cleaning device which maintains the tape cleaning effect for a long time and does not give any damage on the magnetic tape. SOLUTION: This apparatus comprises a tension arm 3 which rotates interlocking with a tension of the running magnetic tape 4 and a tape cleaning device 1 which causes a blade to be in contact with the magnetic tape 4 for the cleaning of the magnetic tape 4. In this case, with rotation of the tension arm 3, contact between the magnetic tape 4 and blade is controlled. Moreover, the distance between the area where the magnetic tape 4 is wound to a preceding guide 1i and isolated therefrom and the end point of the blade is set to be 0.5-10mm. Thereby, the magnetic recording and reproducing apparatus can be reduced in size, power consumption can also be lowered and cost down can be realized. As a result, the tape cleaning effect can be maintained for a long period and there is no fear of damaging or disconnecting the magnetic tape.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing device, and more particularly to a magnetic recording / reproducing device having a tape cleaning device for removing foreign matters such as dust and protrusions attached to a magnetic tape.

[0002]

2. Description of the Related Art Generally, when there is a projection such as dust attached to a magnetic tape, a recorded information signal is lost during recording and a dropout occurs during reproduction of the recorded information signal.
In particular, in the magnetic tape recorded in high density as in recent years,
Even if there are slight protrusions on the magnetic tape, a large information signal is lost. As a means for solving such a problem, a tape cleaning device for removing projections such as dust adhering to the magnetic tape is internally provided in the magnetic recording / reproducing device. This will be described with reference to FIGS. 6 and 7.

In FIG. 6, a magnetic tape 4 contained in a cassette 10 is brought into close contact with a drum 6 having a plurality of rotary heads 6a to reproduce the information recorded on the magnetic tape 4 or record the information on the magnetic tape 4. FIG. 3 is a schematic plan view of the magnetic recording / reproducing apparatus showing a state of performing. The magnetic tape 4 is wound around the entire erasing head 5, the drum 6, the audio / control / erasing head 7 and the like at an appropriate angle by a loading device (not shown), and a capstan 9 and a pinch roller 8 which are rotationally driven by a motor or the like. By the driving force due to the pinching pressure between and, and the guide of the plurality of tape guides 2, the magnetic tape travels at a constant speed in the magnetic tape travel direction indicated by the arrow in the figure. Then, the tape cleaning device 1 generally removes dust and other protrusions adhering to the magnetic tape 4 before the magnetic tape 4 comes into close contact with the drum 6, that is, before recording and reproducing the magnetic tape 4, and the magnetic tape is always 4 is arranged so as to come into contact therewith. Further, the magnetic recording / reproducing apparatus rotates in association with the tape tension of the running magnetic tape 4,
Tension arm 3 that has the function of absorbing slack
Is provided. A guide shaft 3c is fixed to one end of the tension arm 3, and a fulcrum 3a is formed at the other end. One end of the tension arm 3 is fixed to the middle portion of the tension arm 3 so that the tension arm 3 can be rotated counterclockwise. Spring 3
b is attached.

FIG. 7 is an enlarged schematic perspective view of the tape cleaning device 1. The blade 1a is held by an adhesive or the like on a support 1c fixed to the magnetic recording / reproducing apparatus with screws or the like, and is made of a material having a high hardness such as ceramics, sapphire, ruby, or high hardness steel. .
The tip of the blade 1a is a ridge edge 1b that is finished at an acute angle, and the ridge edge 1b is used to scrape off projections such as dust attached to the magnetic tape 3.

However, when the blade 1a of the tape cleaning device 1 is always in contact with the magnetic tape 4 as in the case shown in FIG. 6, the ridge edge 1b is worn out in a short period of time and loses the tape cleaning effect. There is a risk that the ridge edge 1b may be worn away by the magnetic tape 4 that is moved or is traveling at a high speed, and the magnetic tape 4 may be damaged. Further, the magnetic tape 4 may be demagnetized under pressure during FF or RWD running at high speed, and the output of the RF signal during reproduction may be small. As an example of a means for avoiding these, there is a tape cleaning device 1 equipped with an actuator such as a plunger that brings the magnetic tape 3 into contact with the blade 1a only when the magnetic tape 4 is recorded and reproduced. This will be described with reference to the schematic plan view of FIG.

FIG. 8A is a schematic plan view showing the state when the plunger 1d is OFF, and FIG. 8B is a schematic plan view showing the state when the plunger 1d is ON. The plunger 1 which is an actuator is provided at one end of the arm 1e.
The blade 1a is fixed to the other end, which is attached with d and bent into an L-shape, with an adhesive or the like. In addition, a fulcrum 1f and a spring 1g that fixes one end to the blade 1a side of the fulcrum 1f and urges the arm 1e to rotate clockwise are attached to the intermediate portion, and further the arm 1e is set to a predetermined position. A stopper 1h for stopping is provided. FIG.
As shown in, the magnetic tape 4 travels at a high speed, the tape tension is larger and the fluctuation is larger than that at the time of recording / reproducing.
When F or RWD, the plunger 1a is turned off and the spring 1g
The arm 1e is rotated in the clockwise direction indicated by the arrow in FIG.
The arm 1e is stopped at a predetermined position. In this way, the blade 1a is brought into non-contact with the magnetic tape 4. Then, as shown in FIG. 7B, the magnetic tape 4 runs at a constant speed, the tape tension is smaller than that in FF or RWD, and the fluctuation is small, so that the plunger 1d is turned on.
Then, the arm 1e is rotated counterclockwise as indicated by the arrow in the figure against the biasing force of the spring 1g to bring the magnetic tape 4 into contact with the blade 1a, and the magnetic tape 4 is cleaned.

However, in the tape cleaning device 1 which controls the contact between the magnetic tape 4 and the blade 1a by using the electromagnetic actuator such as the plunger 1d as in the above-mentioned case, the magnetic recording / reproducing device is downsized and the power consumption is reduced. It is difficult to reduce the size, and the tape cleaning device 1 becomes expensive, which hinders the cost reduction of the magnetic recording / reproducing device.

By the way, the jamming portion where the magnetic tape 4 is folded in the width direction due to abnormal running of the magnetic tape 4,
It may be formed long in the running direction of the magnetic tape 4.
FIG. 9A is a schematic cross-sectional view of the magnetic tape 4 on which the jamming portion 4a is formed, and FIG. 9B is the jamming portion 4
3 is a schematic plan view showing a state in which the magnetic tape 4 on which a is formed travels on the blade 1a of the tape cleaning device 1. FIG. If there is no tape guide 2 close to the blade 1a on the front side of the tape cleaning device 1 in the tape running direction,
As shown in FIG. 3B, the jamming portion 4a may be caught by the ridge edge 1b of the blade 1a and cut the magnetic tape 4.

[0009]

SUMMARY OF THE INVENTION An object of the present invention is to provide a tape cleaning device which maintains a tape cleaning effect for a long time and does not damage a magnetic tape.
A magnetic recording / reproducing apparatus is provided.

[0010]

In order to solve the above-mentioned problems, in the magnetic recording / reproducing apparatus according to the first and second aspects of the invention,
In a magnetic recording / reproducing apparatus having a tension arm that rotates in conjunction with the tension of a running magnetic tape and a tape cleaning device that contacts a blade to the magnetic tape and cleans the magnetic tape, the rotation of the tension arm causes a magnetic It is characterized in that contact or non-contact of the tape with the blade is controlled.

According to another aspect of the magnetic recording / reproducing apparatus of the present invention,
A preceding guide is provided on the front side of the blade in the running direction of the magnetic tape, and the distance from the position where the magnetic tape winds around the preceding guide to the blade edge is 0.5 mm or more 10
It is characterized in that it is not more than mm.

The operation of the above-described means is that the magnetic tape is taped when the tape tension during recording / reproduction of the magnetic tape is relatively small and does not fluctuate by the tension arm that rotates in conjunction with the tape tension. At the time of FF and RWD, where the magnetic tape automatically contacts the blade of the cleaning device and the tape tension becomes larger and the fluctuations become larger than when recording / reproducing the magnetic tape, the magnetic tape automatically separates from the blade and becomes non-contact. The wear of the edge of the blade is minimized and uneven wear is prevented. Therefore,
The tape cleaning effect is maintained for a long time, and there is no fear of damaging the magnetic tape.

Further, in the case where a preceding guide is provided on the front side of the blade in the running direction of the magnetic tape, and the distance from the position where the magnetic tape is wound around the preceding guide and away from the blade edge to the blade edge is 0.5 mm or more and 10 mm or less. Since the jamming portion formed on the magnetic tape can be reliably lifted at the same time as the jamming portion is wound around the preceding guide, the jamming portion passes without contacting the ridge edge,
There is no risk of cutting the magnetic tape.

[0014]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
This will be described with reference to FIG. Note that components in the figure that have the same structure as the conventional technology are denoted by the same reference numerals. The schematic structure of the magnetic recording / reproducing apparatus is the same as the case described with reference to FIGS.

FIG. 1 is a schematic plan view of a magnetic recording / reproducing apparatus when recording / reproducing the magnetic tape 4, and FIG. 2 is a magnetic tape 4.
2 is a schematic plan view of a magnetic recording / reproducing apparatus during high-speed traveling such as FF and RWD, in which the tape cleaning device 1 is provided with a full erasing head 5 and a guide shaft 3 of a tension arm 3.
It is arranged in the middle of c. As shown in FIG. 1, the tape tension at the time of recording / reproducing of the magnetic tape 4 is relatively small and its fluctuation is small, and the tension arm 3 is centered on the fulcrum 3a by the urging force of the spring 3b. It is in a stable state by making a large rotation in the counterclockwise direction indicated by the arrow. In this state, the magnetic tape 4 contacts the blade 1a of the tape cleaning device 1,
The magnetic tape 4 is automatically cleaned. Further, since the tape tension of the magnetic tape 4 at the time of FF and RWD is larger than that at the time of recording / reproducing, the tension arm 3 is centered on the fulcrum 3a against the biasing force of the spring 3b as shown in FIG. And rotates clockwise as indicated by the arrow in the figure, and in this state, the blade 1 of the tape cleaning device 1
The a is configured so as to be automatically out of contact with the magnetic tape 4.

FIG. 3 is a schematic plan view of the magnetic recording / reproducing apparatus when recording / reproducing the magnetic tape 4, and FIG.
FIG. 3 is a schematic plan view of a magnetic recording / reproducing apparatus during high-speed traveling such as FF and RWD, in which the tape cleaning device 1 is arranged on the front side of the guide shaft 3c of the tension arm 3 in the magnetic tape traveling direction. The following is the same as the case described with reference to FIGS.

FIG. 5 is an enlarged schematic plan view of the tape cleaning device 1. The leading guide 1 is located close to the blade 1a on the front side of the blade 1a in the magnetic tape running direction.
i is provided, and the magnetic tape 3 is wound around the leading guide 1i at the time of recording / reproducing the magnetic tape 4, and the span distance from the separated position to the edge 1b is set to 0.5 mm or more and 10 mm or less. By arranging the leading guide 1i in this way, the jamming portion 4 as described with reference to FIG.
Even when the magnetic tape 4 having a formed thereon runs, the jamming portion 4a winds around the leading guide 1i, and at the same time, the jamming portion 4a comes into contact with the leading guide 1i so that the magnetic tape 4 can be reliably lifted. Jamming part 4a
Passes without contacting the edge 1b. Therefore, there is no risk of cutting the magnetic tape 4.

[0018]

According to the magnetic recording / reproducing apparatus of the present invention, the magnetic tape and the blade of the tape cleaning device are brought into contact with each other by the tension arm that rotates in conjunction with the tape tension without using an actuator such as a plunger. Since it can be automatically controlled, the magnetic recording / reproducing apparatus can be downsized, the power consumption can be reduced, and the cost can be reduced. Further, the tape cleaning effect can be maintained for a long period of time, and the edge of the blade is prevented from being worn down, so that there is no risk of damaging the magnetic tape.
Further, if the leading guide is provided in the vicinity of the front side of the blade in the magnetic tape running direction, there is no fear of cutting the magnetic tape having the jamming portion with the blade.

[Brief description of drawings]

FIG. 1 is a schematic plan view of a magnetic recording / reproducing apparatus at the time of recording / reproducing a magnetic tape, showing an embodiment to which the present invention is applied.

FIG. 2 is a schematic plan view of a magnetic recording / reproducing apparatus when a magnetic tape is running at a high speed, showing an embodiment to which the present invention is applied.

FIG. 3 is a schematic plan view of a magnetic recording / reproducing apparatus at the time of recording / reproducing a magnetic tape, showing an embodiment to which the present invention is applied.

FIG. 4 is a schematic plan view of a magnetic recording / reproducing apparatus when a magnetic tape is running at a high speed, showing an embodiment to which the present invention is applied.

FIG. 5 is a schematic plan view of a tape cleaning device showing an embodiment to which the present invention is applied.

FIG. 6 is a schematic plan view of a magnetic recording / reproducing apparatus at the time of recording / reproducing a magnetic tape, showing a conventional example.

FIG. 7 is a schematic perspective view of a tape cleaning device showing a conventional example.

FIG. 8 shows a conventional example, in which (a) the plunger is OFF.
It is a schematic plan view at the time of, and (b) is a schematic plan view when a plunger is ON.

9A and 9B show a conventional example, FIG. 9A is a schematic cross-sectional view of a magnetic tape having a jamming portion formed therein, and FIG. 9B shows a state in which the magnetic tape having the jamming portion formed is traveling in a tape cleaning device. It is a schematic plan view.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Tape cleaning device, 1a ... Blade, 1b ...
Edge, 1c ... Mounting base 1d ... Plunger, 1e ... Arm, 1f ... Support point, 1g ...
Spring, 1h ... Stopper, 1i ... Advance guide, 2 ... Tape guide, 3 ... Tension arm, 3a ... Support point, 3b ...
Spring, 3c ... Guide shaft, 4 ... Magnetic tape, 4a ...
Jamming section, 5 ... all erasing head, 6 ... drum, 6a ...
Rotating head, 7 ... Audio / control / erasing head, 8 ... Pinch roller, 9 ... Capstan, 10 ... Cassette

Claims (3)

[Claims] 1. A magnetic recording / reproducing apparatus comprising: a tension arm that rotates in conjunction with the tension of a running magnetic tape; and a tape cleaning device that abuts a blade on the magnetic tape to clean the magnetic tape. A magnetic recording / reproducing apparatus, wherein contact or non-contact of the magnetic tape with the blade is controlled by rotation of the tension arm. 2. The magnetic tape is in contact with the blade when the tension is low, and the magnetic tape is not in contact with the blade when the tension is high. The magnetic recording / reproducing apparatus according to claim 1. 3. A leading guide is provided on the front side of the blade in the traveling direction of the magnetic tape, and a distance from a place where the magnetic tape is wound around the leading guide and away from the blade tip of the blade is 0.5 mm or more. The magnetic recording / reproducing apparatus according to claim 1, wherein the length is 10 mm or less.