JPH07272227A - Magnetic head cleaning device - Google Patents

Abstract

PURPOSE:To surely make a magnetic head mounted on a rotary drum clean. CONSTITUTION:A cleaning roller 12 supported by a shaft at the tip of an arm part 14a of a cleaning arm 14 is brought into contacted with plural magnetic heads 7, an outer peripheral part 3a of a fixed drum 3, and an outer peripheral part 5a of a rotary drum 5. In this case, since rotation of the cleaning roller 12 by a rotating force of the rotary drum 5 is largely slowed down by tilting a shaft 13 of the cleaning roller 12 supported by a shaft at the tip of the arm part 14a of the cleaning arm 14 in the range of 45 degrees to 90 degrees for a shaft 6 of the rotary drum 5, magnetic power and the like persistently stuck on the plural magnetic heads 7 can be surely eliminated by the slowed down cleaning roller 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head cleaning device for cleaning a magnetic head mounted on a rotary drum.

[0002]

2. Description of the Related Art Generally, a video tape recorder (V
TR), digital audio tape recorder (DA)
In T) and the like, a fixed drum having leads formed on the outer periphery for guiding the magnetic tape in a spiral shape, and a fixed drum coaxially rotatably provided so as to face the fixed drum, and the magnetic tape is attached to the outer periphery. It is well known to have a rotary drum along which a magnetic head is mounted so as to project slightly.

Here, the magnetic tape is spirally attached along the outer peripheral portion of the fixed drum and the outer peripheral portion of the rotating drum at a predetermined angle, and recorded on the magnetic tape by a magnetic head that rotates integrally with the rotating drum. Or playing the recorded magnetic tape, but at this time, it is necessary to occasionally clean the magnetic powder etc. attached to the magnetic head,
For this reason, the cleaning roller is brought into contact with and separated from the magnetic head as the magnetic tape is loaded onto the rotary drum.

As a magnetic head cleaning device for a rotary drum equipped with this type of cleaning roller, Japanese Patent Laid-Open No. 2-156407 discloses a rotary drum having a shaft on which the cleaning roller is rotatably supported. On the other hand, a technical idea that is slightly inclined is disclosed.

FIG. 3 is a diagram showing a conventional magnetic head cleaning device.

A conventional magnetic head cleaning device 100 shown in FIG. 3 is disclosed in Japanese Patent Application Laid-Open No. 2-156407. Here, the rotary drum 10 in which the magnetic head 102 is integrally attached is provided above the fixed drum 101.
3 is provided rotatably around the shaft 104 coaxially with the fixed drum 101.

A cleaning roller 107 is rotatably supported on a shaft 106 fixed to the tip of the cleaning arm 105, and the cleaning arm 107 is supported at a mid stage of the magnetic tape loading operation onto the rotating drum 103.
105 rotates, and the cleaning roller 107 makes contact with the fixed drum 101 and the rotating drum 103 to which the magnetic head 102 is integrally attached, and cleans the magnetic powder and the like adhering to the magnetic head 102. At this time, the shaft 106 supporting the cleaning roller 107 is the shaft of the rotary drum 103.
It is fixed to the cleaning arm 105 at a slight angle with respect to 104, and the axis of the cleaning roller 107
The length of 106 is set longer than the length of cleaning roller 107.

As described above, the cleaning roller 10
Since the shaft 106 of 7 is attached at a slight inclination with respect to the shaft 104 of the rotary drum 103, when the cleaning roller 107 is attached to the rotary drum 103, the rotational force A of the rotary drum 103 is as shown in the vector display. Cleaning roller 10
The component force B for rotating 7 and the component force C for moving the cleaning roller 107 obliquely upward along the slightly inclined shaft 106 are dispersed.

That is, in the separated state before the cleaning roller 107 contacts the rotary drum 103, the cleaning roller 107 falls along the shaft 106 due to its own weight and is in the lower position, while the cleaning roller 107 is When mounted on the rotating drum 103, the cleaning roller 107
Follow 106 to the upper position.

As described above, since the cleaning roller 107 is moved from the lower position to the upper position, the magnetic head 102 can contact different parts of the cleaning roller 107 and enhance the cleaning effect of the magnetic head 102. be able to.

[0011]

By the way, in the above-mentioned conventional magnetic head cleaning device 100, the shaft 106 of the cleaning roller 107 is slightly tilted with respect to the shaft 104 of the rotating drum 103 so that the magnetic head 102 is cleaned.・
By only contacting different parts of the roller 107, the cleaning effect of the magnetic head 102 is only enhanced, and another phenomenon occurs in which the dirt of the magnetic head 102 is not completely removed.

In pursuit of this cause, the cleaning drum 107 has a small inclination angle, so that the rotating drum 103
Cleaning roller with a large component B due to the rotational force A
107 rotates at high speed. At this time, cleaning
Since the roller 107 is also attached to the fixed drum 101, a frictional load is applied to the cleaning roller 107 by the fixed drum 101 and the rotational speed of the cleaning roller 107 is reduced, but the rotational force of the rotating drum 103 is reduced. Since the component force B against A is large, the cleaning roller 107
Rotates at high speed.

As a result, it has been found that when the cleaning roller 107 rotates at a high speed, the magnetic powder strongly stuck to the magnetic head 102 does not fall off.

[0014]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and includes a fixed drum fixedly installed on a chassis base or the like and having a lead for spirally guiding a magnetic tape formed on an outer peripheral portion thereof, A rotary drum, which is rotatably provided coaxially with the fixed drum so as to be rotatable coaxially with the magnetic tape, and a magnetic head is mounted so as to project slightly along the outer peripheral portion of the magnetic tape, and the magnetic head is cleaned. Head for supporting a cleaning roller for rotating the drum, and means for bringing the cleaning roller into and out of contact with the magnetic head and the outer peripheral portions of both drums when the magnetic tape is loaded onto the rotary drum. In the cleaning device, the shaft of the cleaning roller is tilted with respect to the shaft of the rotary drum over a range of 45 ° to 90 °. , There is provided a magnetic head cleaning device, characterized in that to decelerate the rotation of the cleaning roller by the rotational force of the rotary drum.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a magnetic head cleaning device according to the present invention will be described in detail below with reference to FIGS.

1A and 1B are views for explaining a magnetic head cleaning device according to the present invention. FIG. 1A is a plan view, FIG. 1B is a side view seen from the direction of arrow M, and FIG. 2 is the same magnetic head. In the cleaning device, it is a schematic diagram for explaining the inclination angle of the cleaning roller shaft,
(A) is a diagram in which the shaft of the cleaning roller is inclined by 45 ° with respect to the shaft of the rotating drum, and (B) is the cleaning
It is a figure in which the axis of the roller is tilted more than 45 ° and within 90 ° with respect to the axis of the rotating drum.
It is the figure which inclined the axis of a roller 90 degrees to the axis of a rotating drum. In the magnetic head cleaning device 1 according to the present invention shown in FIGS. 1A and 1B, on the chassis base 2 such as a video tape recorder (VTR) or a digital audio tape recorder (DAT), A fixed drum 3 having a lead 3a ₁ for guiding the magnetic tape 4 in a spiral shape is fixedly installed on a cylindrical outer peripheral portion 3a. Here, the fixed drum 3 is the chassis base 2
It is installed at an angle with respect to.

Above the fixed drum 3, there is a rotary drum 5 facing the fixed drum 3 with a slight distance from the shaft 6.
It is rotatably provided in the counterclockwise direction. At this time, the rotary drum 5 is provided coaxially with the center of the fixed drum 3. In addition, the cylindrical outer peripheral portion 5 of the rotating drum 5
A plurality of magnetic heads 7, 7 are attached rotatably integrally with the rotary drum 5 on the surface side facing the fixed drum 3 at a, and the tip end portions of these magnetic heads 7, 7 are located from the outer peripheral portion 5a. Very slightly protruding.

On the chassis base 2, a loading base 9 having a tape guide pole 8 on the supply side provided upright.
And a guide groove 2b for guiding the loading base 11 on which the tape guide pole 10 on the winding side is erected are formed separately on the left and right sides of the fixed drum 3 and the rotating drum 5. . The tape guide poles 8 and 10 standing on these loading bases 9 and 11 are
While pulling out the magnetic tape 4 from a tape cassette (not shown), it moves toward the fixed drum 3 and the rotating drum 5,
Here, the magnetic tape 4 is spirally attached to the outer peripheral portion 3a of the fixed drum 3 and the outer peripheral portion 5a of the rotating drum 5 at a predetermined angle, and a plurality of magnetic heads 7 and 7 that rotate integrally with the rotating drum 5 are provided. The magnetic tape 4 is recorded and reproduced by.

On the chassis base 2, in the vicinity of the guide groove 2b on the take-up side, a cleaning member for cleaning the magnetic powder adhered to the plurality of magnetic heads 7, 7, which is an essential part of the present invention, is cleaned. A cleaning arm 14 supporting the roller 12 is provided rotatably around a fixed shaft 15. That is, the fixed shaft 15 that supports the cleaning arm 14 is fixedly installed on the chassis base 2 substantially vertically. Further, at the tip of the long arm portion 14a of the cleaning arm 14 supported by the fixed shaft 15, the cleaning
A shaft 13 rotatably supporting the roller 12 is fixed.

The cleaning roller 12 is formed in a cylindrical shape by using polyurethane sponge or the like, and the cleaning roller 12 pivotally supported by the arm portion 14a of the cleaning arm 14 is attached to the rotary drum 5. The magnetic heads 7, 7 are mounted at a height position where they can be cleaned. Further, the size of the cleaning roller 12 is formed so that it can be attached to the outer peripheral portion 3a of the fixed drum 3 and the outer peripheral portion 5a of the rotating drum 5 at the same time.

Further, here, the cleaning roller 12
The inclination angle θ of the shaft 13 supporting the
With respect to θ = 45 ° to 90 °,
Cleaning roller 12 by rotating force of rotating drum 5
The rotation speed of the roller is greatly reduced. At this time, it is an essential part of the present invention that the inclination angle θ of the shaft 13 that supports the cleaning roller 12 is set as described above.
This will be described later.

Further, the cleaning arm 14 is integrally formed by using a resin material, and a strong arm portion 14a for supporting the cleaning roller 12 is formed so as to stand up and a resin arm is provided below. The elastically displacing pressing portion 14b is formed on the thin arc-shaped arm by utilizing the characteristics of the material. At this time, the arm portion 14a of the cleaning arm 14 and the pressing portion 14b are vertically separated into a bifurcated shape, and a recess 14c is formed in the bifurcated portion.

At the stage before the magnetic tape loading operation is started, the arc-shaped pressing portion 14b formed below the cleaning arm 14 has a guide groove 2b on the take-up side.
It projects inside. After that, when the loading base 11 on the take-up side moves in the direction of the fixed drum 3 and the rotating drum 5 along the guide groove 2b in accordance with the magnetic tape loading operation, the loading base 11 is in the middle of the magnetic tape loading operation. Since the cylindrical protrusion 11a protruding upward pushes the pressing portion 14b of the cleaning arm 14 protruding into the guide groove 2b, the cleaning arm 1
4 rotates counterclockwise around the fixed shaft 15, whereby the cleaning roller 12 axially supported by the tip of the arm portion 14a of the cleaning arm 14 moves the outer circumference 3a of the fixed drum 3 and the outer circumference of the rotary drum 5. It is attached to the part 5a.

Further, when the cleaning roller 12 is in contact with the outer peripheral portion 3a of the fixed drum 3 and the outer peripheral portion 5a of the rotating drum 5, the rotating drum 5 has the shaft 6 even during the magnetic tape loading operation. Since the magnetic heads 7, 7 rotate in the counterclockwise direction, the magnetic heads 7, 7 naturally rotate together with the rotary drum 5, and the magnetic powder and the like attached to the magnetic heads 7, 7 are removed by the cleaning roller 12. To clean. At this time, the cleaning roller 12
The force that presses against the outer peripheral portion 3a of the fixed drum 3 and the outer peripheral portion 5a of the rotating drum 5 is due to the elastic force of the arc-shaped pressing portion 14b formed below the cleaning arm 14.

Further, at the completion stage of the magnetic tape loading operation, the loading base 11 on the winding side advances to the inner side of the fixed drum 3 and the rotating drum 5 along the guide groove 2b, so that a cylinder formed on the loading base 11 is formed. -Shaped protrusion 11a can enter into the concave portion 14c of the cleaning arm 14, whereby the cleaning arm 1
Since 4 rotates clockwise about the fixed shaft 15, the cleaning roller 12 pivotally supported on the tip of the arm portion 14a of the cleaning arm 14 is mounted on the outer peripheral portion 3a of the fixed drum 3 and the outer peripheral portion 5a of the rotating drum 5. And the cleaning operation is completed.

Here, with respect to the inclination angle θ of the shaft 13 which supports the cleaning roller 12, which is an essential part of the present invention,
This will be described with reference to FIGS.

As described above in the conventional example, when the cleaning roller 12 contacts the outer peripheral portion 3a of the fixed drum 3 and the outer peripheral portion 5a of the rotating drum 5, the cleaning roller 12
It has been found that when the rotation speed of the roller 12 is high, the magnetic powder and the like strongly stuck to the plurality of magnetic heads 7 do not fall off. @ So, in order to solve this problem,
An experiment was conducted in which the rotation speed of the cleaning roller 12 rotated by the rotating drum 5 was reduced as much as possible.

First, as shown in FIG. 2A, the inclination angle θ of the shaft 13 which supports the cleaning roller 12 is set to θ = 45 ° with respect to the shaft 6 of the rotary drum 5. At this time, the rotational force A of the rotary drum 5 is displayed as a vector display.
Is the component force B that rotates the cleaning roller 12.
₁ and a component force C ₁ that moves the cleaning roller 12 obliquely upward along the inclined shaft 13. Since θ = 45 ° is set here, the component force B ₁ and the component force C ₁ have different directions but the same magnitude.
On the other hand, if θ is set to 45 ° or less, the component force for rotating the cleaning roller 12 is diagonally upward along the inclined shaft 13 as in the conventional case. Obviously, the cleaning roller 12 is rotated at a high speed. Therefore, the angle of θ = 45 ° is
This is the minimum limit tilt angle when the cleaning roller 12 rotated by the rotational force A of the rotating drum 5 is set from high speed rotation to deceleration rotation. Of course, cleaning roller 1
Since 2 is also attached to the outer peripheral portion 3a of the fixed drum 3,
A frictional load is applied to the cleaning roller 12 by the fixed drum 3, and the rotation speed of the cleaning roller 12 is further reduced.
With this, it is possible to surely drop the magnetic powder and the like strongly stuck to the plurality of magnetic heads 7, 7.

Next, as shown in FIG. 2B, the inclination angle θ of the shaft 13 which supports the cleaning roller 12 is within 45 ° and 90 ° with respect to the shaft 6 of the rotary drum 5. Set to an appropriate angle. At this time, as indicated by a vector, the rotational force A of the rotary drum 5 is equal to the component force B ₂ for rotating the cleaning roller 12 and the cleaning roller 1
2 is dispersed into a component force C ₂ that moves ₂ obliquely upward along the inclined axis 13. Since 45 ° <θ <90 ° is set here, the magnitude of the component force B ₂ is smaller than the component force C ₂ , and as a result, the cleaning roller 12 is smaller than the case shown in FIG. 2A. Since the rotation speed of is further reduced, the magnetic head cleaning effect can be further improved.

Next, as shown in FIG. 2C, the inclination angle θ of the shaft 13 which supports the cleaning roller 12 is set to θ = 90 ° with respect to the shaft 6 of the rotary drum 5. At this time, as indicated by a vector, no rotational force A of the rotating drum 5 produces a component force for rotating the cleaning roller 12. Therefore, while the cleaning roller 12 stops rotating, the magnetic powder or the like strongly stuck to the plurality of magnetic heads 7 and 7 can be more surely dropped, but the plurality of magnetic heads 7 and 7 can clean the cleaning roller 12. There is a risk that the part that comes into contact with will always be constant. Therefore, when the angle θ is set to 90 °, the gear-shaped ratchet 16 made of a resin material and having a diameter slightly smaller than the diameter of the cleaning roller 12 can be rotated integrally with the cleaning roller 12. When the mounting / cleaning roller 12 is separated from the fixed drum 3 and the rotating drum 5, the ratchet 16 is rotated in cooperation with the movement of the loading base 11 on the winding side, and the cleaning / cleaning operation is performed corresponding to the next cleaning operation. Laura 1
It suffices to change the contact area of No. 2. Therefore,
The angle of θ = 90 ° is the maximum limit tilt angle when the cleaning roller 12 is set to the decelerating rotation because the cleaning roller 12 does not rotate due to the rotational force A of the rotating drum 5.

As a result of the above experiment, the shaft 13 of the cleaning roller 12 is 45 ° to 9 ° with respect to the shaft 6 of the rotary drum 5.
By inclining over the range of 0 °, the rotation of the cleaning roller 12 due to the rotational force of the rotary drum 5 is greatly reduced, and as a result, the cleaning cleaning speed is reduced.
The roller 12 can surely drop the magnetic powder or the like strongly stuck to the plurality of magnetic heads 7, 7 and improve the quality and reliability of the magnetic head cleaning device 1. Further, when recording / reproducing on / from the magnetic tape 4 by a video tape recorder (VTR), a digital audio tape recorder (DAT) or the like which employs the magnetic head cleaning device 1 according to the present invention, a plurality of cleaning rollers 12 are decelerated by the cleaning roller 12. Since the FM envelopes of video signals and audio signals are always maintained in a good condition after removing the magnetic powder and the like that strongly adheres to the magnetic heads 7 and 7, the quality and reliability of these tape recorders are also improved. Can be improved. Furthermore,
Since the rotation speed of the cleaning roller 12 becomes low, noise (noise etc.) when the cleaning roller 12 rotates can be reduced.

In the embodiment, the cleaning roller 1
Although the length of 2 is set to be substantially the same as the length of the shaft 13 of the portion that supports the cleaning roller 12, the length of the shaft 13 is set to the length of the cleaning roller 12 as described in the conventional example. Obviously, it may be set longer than that.

[0033]

According to the magnetic head cleaning device of the present invention, which has been described in detail above, the cleaning roller shaft is inclined at an angle of 45 ° to 90 ° with respect to the rotating drum shaft for cleaning. Since the rotation speed of the roller has been greatly reduced, it is possible to reliably remove the magnetic powder that has strongly adhered to the magnetic head by the decelerated cleaning roller, improving the quality and reliability of the magnetic head cleaning device. You can Further, when recording / reproducing on / from a magnetic tape with a video tape recorder (VTR), a digital audio tape recorder (DAT) or the like which employs the magnetic head cleaning device according to the present invention, the magnetic head is strong by the decelerating cleaning roller. Since the FM envelope of the video signal, the audio signal, etc. is always maintained in a good state after the magnetic powder and the like that have clinged to it are removed, the quality and reliability of these tape recorders can also be improved. Furthermore,
By reducing the rotation speed of the cleaning roller, noise (noise etc.) when the cleaning roller rotates can be reduced.

[Brief description of drawings]

1A and 1B are views for explaining a magnetic head cleaning device according to the present invention, in which FIG. 1A is a plan view and FIG. 1B is a side view seen from a direction of an arrow M.

FIG. 2 is a schematic diagram for explaining an inclination angle of a shaft of a cleaning roller in a magnetic head cleaning device according to the present invention.

FIG. 3 is a diagram showing a conventional magnetic head cleaning device.

[Explanation of symbols]

1 ... magnetic head cleaning device, 2 ... chassis base, 2b ... guide groove of the take-up side, 3 ... fixed drum, 3a ... outer peripheral portion, 3a 1 _... lead, 4 ... magnetic tape, 5 ... rotary drum, 6 ... Rotation Drum shaft, 7 ... Magnetic head, 11 ... Winding side loading base, 11a ... Protrusion, 12 ... Cleaning roller, 13 ... Cleaning roller shaft, 1
4 ... Cleaning arm, 14a ... Arm part, 14b ... Pressing part, 14c ... Recessed part, 15 ... Fixed shaft (cleaning arm shaft).

Claims (1)

[Claims] 1. A fixed drum fixedly installed on a chassis base or the like and having a lead for spirally guiding a magnetic tape formed on an outer peripheral part thereof, and a coaxially rotatable member facing the fixed drum, and A rotary drum having a magnetic head mounted so as to project slightly along the outer peripheral portion to which the magnetic tape is attached, and a cleaning roller for cleaning the magnetic head are pivotally supported, and the magnetic force applied to the rotary drum is A magnetic head cleaning device comprising means for bringing the cleaning roller into contact with and separating from the magnetic head and the outer peripheral portions of both drums in accordance with a tape loading operation, wherein the axis of the cleaning roller is the axis of the rotary drum. In contrast, the cleaning roller of the cleaning roller is rotated by the rotating force of the rotating drum by inclining it in the range of 45 ° to 90 °. Magnetic head cleaning device is characterized in that slow down the rotation.