JPH0729128A - Cleaning apparatus for magnetic head - Google Patents

Abstract

PURPOSE:To obtain a magnetic head cleaning apparatus which can improve the cleaning efficiency. CONSTITUTION:A rotatable cleaning member 21 is brought in touch with a magnetic head 8 provided in an upper rotary drum 6 of a VTR or the like, whereby the magnetic head 8 is cleaned in the magnetic head cleaning apparatus. The cleaning member 21 is disposed so that a rotary shaft 23 thereof is inclined in a predetermined direction to a rotary shaft 10 of the upper rotary drum 6. Accordingly, cleaning is effected not only in the moving direction of the magnetic head, but in a direction orthogonal to the moving direction (in an up-and-down direction). The cleaning effect for the magnetic head is improved. Moreover, the area of the cleaning member where in touch with tone magnetic head is increased, so that the contamination or damage of the cleaning member 21 is restricted.

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 provided on a rotary drum such as a VTR by bringing a cleaning member rotatably supported into contact with the magnetic head. It is about.

[0002]

2. Description of the Related Art A conventional magnetic head cleaning device of this type, for example, a magnetic head cleaning device used for a VHS format VTR will be described below with reference to FIGS.

In a conventional magnetic head cleaning device, a cylindrical cleaning member 1 formed of an elastic material such as sponge or felt is rotatably supported on a rotation center shaft 3 at the tip of a cleaning member arm 2. The cleaning member arm 2 is moved so as to be brought into contact with the outer peripheral surface of the head drum 4.

The head drum 4 is attached to a drum base 5, and the rotating upper drum 6 and a magnetic head 8 fixed to the outer peripheral surface of the rotating upper drum 6 via a head base 7.
And a fixed drum 9 and a shaft 10 and the like which is provided in the fixed drum 9 and serves as a rotation center axis of the rotary upper drum 6.

In the above structure, the head base 7 to which the magnetic head 8 is fixed is fixedly attached to the rotating upper drum 6 by the head attaching screw 11.

Further, the rotation center shaft 3 of the cleaning member 1
And the shaft 10 of the head drum 4 are arranged so as to be parallel to each other, and accordingly, the cleaning member 1
The rotation direction cw is opposite to the rotation direction ccw of the rotating upper drum 6.

In the magnetic head cleaning device constructed as described above, the cleaning member 1 is brought into contact with the outer peripheral surfaces of the rotating upper drum 6 of the head drum 4 and the fixed drum 8 by the movement of the cleaning member arm 2. At this time,
The cleaning member 5 rotates in the cw direction by using the rotational force of the rotating upper drum 6 as a power source, but since it also slightly contacts the fixed drum 9, it has the same peripheral speed as that of the rotating upper drum 6 (an arbitrary outer peripheral surface). The linear velocity in the tangential direction at one point cannot be obtained, and the cleaning member 1 and the rotary drum 6
There is a difference in peripheral speed between and.

The frictional force between the cleaning member 1 and the magnetic head 8 attached to the rotating drum 6 caused by the difference in peripheral speed allows the cleaning of the magnetic head 8 by the cleaning member 1.

[0009]

However, in the conventional magnetic head cleaning device, since the rotation center shaft 3 of the cleaning member 1 and the shaft 10 of the head drum 4 are arranged in parallel with each other, the cleaning member 1 and the magnetic head are not magnetically coupled to each other. There is a problem that the peripheral speed difference from the head 8 occurs only in one direction in which the magnetic head 8 travels, and therefore the cleaning effect of the magnetic head 8 is weak.

Further, the magnetic head 8 of the cleaning member 1
The portion used for cleaning, that is, the portion that is in contact with the magnetic head 8 (shown by the shaded portion 12 in FIG. 21) is only a small portion of the outer peripheral surface, and not only cleaning efficiency is poor, but also the cleaning member 1 becomes dirty. There is a problem that it is easily damaged.

The present invention has been made in view of the above circumstances, and cleaning is performed not only in the traveling direction of the magnetic head, but also in the direction perpendicular (vertical) to the traveling direction of the magnetic head. A magnetic head cleaning device capable of improving the cleaning effect and improving the cleaning efficiency by increasing the area of a portion of the cleaning member that comes into contact with the magnetic head to suppress dirt and scratches on the cleaning member. The purpose is to provide.

[0012]

In order to achieve the above object, a magnetic head cleaning device of the present invention applies a cleaning member rotatably supported to a magnetic head provided on a rotary drum such as a VTR. By touching,
In the magnetic head cleaning device for cleaning the magnetic head, the cleaning member is arranged such that a rotation axis direction of the cleaning member is inclined in a predetermined direction with respect to a rotation axis direction of the rotating upper drum. is there.

In the magnetic head cleaning device of the present invention, a magnetic head for cleaning the magnetic head is cleaned by bringing a cleaning member rotatably supported into contact with a magnetic head provided on a rotary drum such as a VTR. In the head cleaning device, the cleaning member has an asymmetric shape with respect to the rotation axis of the cleaning member.

[0014]

In the magnetic head cleaning device of the present invention, the direction in which the frictional force due to the peripheral speed difference of the cleaning member with respect to the magnetic head acts is not limited to one of the traveling directions of the magnetic head, but also to the traveling direction of the magnetic head. Since it also works in the vertical (up and down) direction, the cleaning effect of the magnetic head can be improved.

Further, since the area of the portion of the cleaning member that comes into contact with the magnetic head can be increased, it is possible to suppress dirt and scratches on the cleaning member and improve the cleaning efficiency.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the magnetic head cleaning device of the present invention will be described below with reference to FIGS.
The same parts as those of the conventional example are designated by the same reference numerals, and the description thereof will be omitted.

In the magnetic head cleaning device of this embodiment, the rotation center shaft 23 for rotatably supporting the cleaning member 21 is connected to the shaft 1 of the head drum 4.
The fixed drum 9 is arranged in a state of being orthogonal to 0.
The magnetic head 8 is attached to the rotary drum 6 side at a portion corresponding to the position where the magnetic head 8 is attached, and the notch 24 is provided so as not to contact the cleaning member 21 at this portion.

According to the magnetic head cleaning device constructed as described above, when the cleaning member 21 is brought into contact with the head drum 4, the cleaning member 21 uses the rotational force of the rotating upper drum 6 as a power source to drive the magnetic head. The tape 8 (not shown) is rotated in a circle around the rotation center axis 23 (indicated by the arrow 25 in the figure).

Therefore, the cleaning member 1 rotating in such a state and the magnetic head 8 come into contact with each other, so that the cleaning (in the drawing) in the traveling direction of the magnetic head 8 (indicated by the arrow 26 in the drawing) is performed. , (Indicated by the arrow 27 direction), but also in the direction perpendicular to the traveling direction of the magnetic head 8 (up and down) (indicated by the arrow 28 direction in the figure). Can be significantly improved.

The portion of the cleaning member 21 used for cleaning the magnetic head 8 is the shaded portion 2 in FIG.
As shown in FIG. 9, since it has a large area, it is possible to prevent the cleaning member 21 itself from being soiled, scratched, etc., and improve the cleaning efficiency.

The cleaning member 21 may be roughly classified into those shown in FIGS. 4 to 6, but the shape of the cleaning member 21 to be used may be selected according to the expected cleaning effect. For example, as compared to the case where the cleaning member 21a whose surface contacting the magnetic head 8 is flat as shown in FIG.
When the convex cleaning member 21b is used as shown in FIG. 6, it is possible to obtain a cleaning effect focusing on the traveling direction of the magnetic head 8, while the concave cleaning member 21c is used as shown in FIG. When used, it is possible to obtain a cleaning effect that focuses more on the direction perpendicular to the traveling direction of the magnetic head 8 than the traveling direction.

Next, a second embodiment of the magnetic head cleaning device of the present invention will be described with reference to FIG.
The same parts as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

In the magnetic head cleaning device of this embodiment, the rotation center shaft 23 of the cleaning member 21 is slightly elevated above the tape (not shown) sliding surface of the magnetic head 8 in the first embodiment described above. (Indicated by arrow 30 in the figure).

According to the magnetic head cleaning device constructed as described above, when the cleaning member 21 is rotated, the contacting force between the cleaning member 21 and the rotary upper drum 6 becomes large, and the cleaning is started from the rotary upper drum 6. The rotation power can be reliably transmitted to the member 21. Further, the cleaning member 21 and the fixed drum 9
Since the force with which the cleaning member 21 comes into contact with the cleaning member 21 becomes small, the cleaning member 21 can obtain a sufficient rotational force even if the notch 24 in the above-described embodiment is omitted.

A third embodiment of the magnetic head cleaning device of the present invention will be described with reference to FIGS. 8 and 9. The same parts as those in the first embodiment are designated by the same reference numerals, and their description will be omitted. Omit it.

In the magnetic head cleaning device of this embodiment, in the second embodiment described with reference to FIG. 7, the rotation center shaft 23 of the cleaning member 21 is moved relative to the tape (not shown) sliding surface of the magnetic head 8. The magnetic head 8 passes through a position offset from the rotation center axis 23 line of the cleaning member 21 by being moved slightly downward (indicated by arrow 31 in the figure) and arranged in parallel.

According to the magnetic head cleaning device constructed as described above, the rotational force of the rotating drum 6 is used as the power source to rotate the cleaning member 21 to the center of rotation (indicated by the arrow 32 in the figure). Since the magnetic head 8 passes at a position offset with respect to it, cleaning in the direction inclined with respect to the traveling direction of the magnetic head 8 (indicated by arrow 33 in the figure) (indicated by arrow 34 in the figure) It can be performed.

Here, the magnetic head 8 is vulnerable to an external force in a direction perpendicular to its traveling direction, and as in the above-described first and second embodiments, it is perpendicular to the traveling direction of the magnetic head 8. If they come into contact with each other, the magnetic head 8 may be broken, but according to the present embodiment, by adjusting the external force in the direction perpendicular to the traveling direction of the magnetic head 8, It is possible to safely perform cleaning in the direction perpendicular to the traveling direction of the magnetic head 8 while eliminating the risk of breakage of the magnetic head 8.

Further, some magnetic heads have directivity in strength against external force. For example, as shown in FIG. 10, a method of adhering the magnetic head 8 to the head base 7 or a degree of stress concentration. As a result, the strength with respect to an external force from below (indicated by the arrow 36 in the figure) is about 1/2 of the strength with respect to the external force from above (indicated by the arrow 35 in the figure). As a fourth embodiment of the magnetic head cleaning device of the present invention, a magnetic head cleaning device for dealing with such a magnetic head will be described with reference to FIG.
1 and FIG. 12, the same parts as those in the first embodiment will be designated by the same reference numerals and the description thereof will be omitted.

In the magnetic head cleaning device of this embodiment, the rotation center axis 23 of the cleaning member 21 is on the same plane as the shaft 10 of the head drum 4 in the third embodiment described with reference to FIGS. 8 and 9. The magnetic heads 8 are translated and offset in the opposite direction (indicated by arrow 38 in the figure) of the traveling direction (indicated by arrow 37 in the figure) so as not to intersect.

According to the magnetic head cleaning device constructed as described above, the cleaning member 21 and the magnetic head 8 are most strongly contacted with each other near the center line 39 of the head drum 4, and the cleaning member 21 rotates (see FIG. The external force applied to the magnetic head 8 by the force (indicated by the arrow 40 in the figure) is more oblique from below than the external force (indicated by the arrow 41 in the figure) from the obliquely upper direction with respect to the traveling direction of the magnetic head 8. The external force (indicated by the arrow 42 in the figure) can be increased, and it is possible to deal with the cleaning of the magnetic head having directionality in strength against the external force.

Further, a case where it is desired to make the external force applied to the magnetic head from the upper side larger than the external force applied from the lower side will be described as a fifth embodiment of the magnetic head cleaning device of the present invention with reference to FIGS. The same parts as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

The magnetic head cleaning device of this embodiment is different from the first embodiment described with reference to FIGS. 1 to 3 in that the rotation center shaft 23 of the cleaning member 21 slides on the tape (not shown) of the magnetic head 8. Inclined slightly downward (indicated by arrow 43 in the figure) about the surface, and moved slightly upward (indicated by arrow 44 in the figure) with respect to the tape (not shown) sliding surface of the magnetic head 8. Further, the magnetic head 8 is configured so as to be translated and offset in the same direction as the traveling direction of the magnetic head 8 (indicated by the arrow 45 in the figure).

In the above structure, a cutout portion 24 is provided in the portion of the fixed drum 9 near the magnetic head 8.

According to the magnetic head cleaning device constructed as described above, the cleaning member 21 and the magnetic head 8 are most strongly contacted with each other near the center line 46 of the head drum 4, and the cleaning member 21 is rotated. The magnetic head 8 is driven by force (indicated by the arrow 47 in the figure).
The external force applied to the magnetic head 8 is diagonally upward with respect to the traveling direction of the magnetic head 8 (indicated by the arrow 48 in the figure), and the external force is obliquely upward (indicated by the arrow 49 in the figure).
Can be made larger.

Further, in the first to fifth embodiments, the magnetic head cleaning in which the cleaning member is arranged such that the rotation axis direction of the cleaning member and the rotation axis direction of the upper rotary drum are orthogonal or substantially orthogonal to each other Although the apparatus has been described, in the conventional example described with reference to FIG. 18 to FIG. 20, the rotation axis direction of the cleaning member is the movement of the magnetic head on the tape sliding surface of the magnetic head with respect to the rotation axis direction of the rotating drum. A magnetic head cleaning device arranged in a tilted direction or the opposite direction will be described with reference to FIG. 16 as a sixth embodiment of the magnetic head cleaning device of the present invention. The reference numerals are given and the description thereof is omitted.

In the magnetic head cleaning device of this embodiment, in the conventional example described with reference to FIGS. 18 to 20, the rotation center shaft 53 of the cleaning member 51 is placed on the tape (not shown) sliding surface of the magnetic head 8. Magnetic head 8
Is slightly rotated (indicated by the arrow 60 direction in the figure) in the traveling direction.

According to the magnetic head cleaning device constructed as described above, since the rotation direction of the cleaning member 51 is inclined with respect to the traveling direction of the magnetic head 8, the cleaning is limited to the traveling direction of the magnetic head 8. Instead, cleaning is performed in an oblique direction with respect to the traveling direction of the magnetic head 8, and the cleaning effect of the magnetic head 8 can be improved.

Further, in the above-described first to sixth embodiments, the cleaning member is arranged in a state in which the rotation axis direction of the cleaning member is inclined in a predetermined direction with respect to the rotation axis direction of the rotary upper drum. Although the magnetic head cleaning device has been described, the present invention relates to a magnetic head cleaning device in which the rotation axis direction of the cleaning member and the rotation axis direction of the rotating upper drum are in a parallel relationship as in the conventional example described with reference to FIGS. A seventh embodiment of the magnetic head cleaning device will be described with reference to FIG. 17, but the same parts as those in the conventional example will be designated by the same reference numerals and the description thereof will be omitted.

In the magnetic head cleaning device of this embodiment, in the conventional example described with reference to FIGS. 18 to 20, the cleaning member 61 is replaced by the cleaning member 61.
The abacus ball shape is asymmetric with respect to the rotation center axis 63.

According to the magnetic head cleaning device constructed as described above, the cleaning member 61 rotates by using the rotational force of the rotating drum 6 as a power source. At this time,
The portion of the cleaning member 61 protruding in the outer peripheral direction moves up and down at the position where it abuts on the magnetic head 8, and cleaning in the direction perpendicular to the moving direction of the magnetic head 8 can also be performed. The cleaning effect of the magnetic head 8 can be improved.

[0042]

According to the magnetic head cleaning device of the present invention, not only the moving direction of the magnetic head but also the vertical (up and down) direction with respect to the moving direction is actuated to improve the cleaning effect of the magnetic head. In addition, by increasing the area of the portion of the cleaning member that contacts the magnetic head,
It is possible to suppress scratches and improve cleaning efficiency.

[Brief description of drawings]

FIG. 1 is a side partial cross-sectional explanatory view showing a first embodiment of a magnetic head cleaning device of the present invention.

FIG. 2 is a front explanatory view showing a first embodiment of the magnetic head cleaning device of the present invention.

FIG. 3 is an enlarged front view of essential parts showing the first embodiment of the magnetic head cleaning device of the present invention.

FIG. 4 is a side view of a main part showing a cleaning member having a planar shape in the first embodiment of the magnetic head cleaning device of the present invention.

FIG. 5 is a side view of the principal part showing a cleaning member having a convex surface shape in the first embodiment of the magnetic head cleaning device of the present invention.

FIG. 6 is a side view of the main part showing a cleaning member having a concave surface shape in the first embodiment of the magnetic head cleaning device of the present invention.

FIG. 7 is a partial side sectional explanatory view showing a second embodiment of the magnetic head cleaning device of the present invention.

FIG. 8 is a partial side cross-sectional explanatory view showing a third embodiment of the magnetic head cleaning device of the present invention.

FIG. 9 is an enlarged front explanatory view of the essential parts showing the third embodiment of the magnetic head cleaning device of the present invention.

FIG. 10 is a schematic side explanatory view of a main portion showing the directionality of strength of the magnetic head with respect to an external force.

FIG. 11 is a fourth magnetic head cleaning device of the present invention.
It is a front explanatory view showing an example of.

FIG. 12 is a fourth magnetic head cleaning device of the present invention.
FIG. 4 is an enlarged front view of the essential parts showing the embodiment of FIG.

FIG. 13 is a fifth part of the magnetic head cleaning device of the present invention.
It is a side surface partial cross-section explanatory drawing which shows the Example of this.

FIG. 14 is a fifth part of the magnetic head cleaning device of the present invention.
It is a front explanatory view showing an example of.

FIG. 15 is a fifth part of the magnetic head cleaning device of the present invention.
FIG. 4 is an enlarged front view of the essential parts showing the embodiment of FIG.

FIG. 16 is a sixth magnetic head cleaning device of the present invention.
It is a side surface partial cross-section explanatory drawing which shows the Example of this.

FIG. 17 is a seventh part of the magnetic head cleaning device of the present invention.
It is a side surface partial cross-section explanatory drawing which shows the Example of this.

FIG. 18 is a top view illustrating a conventional magnetic head cleaning device.

FIG. 19 is a side view for explaining the direction of arrow A in FIG.

FIG. 20 is a side partial cross-sectional explanatory view showing a conventional magnetic head cleaning device.

FIG. 21 is an enlarged side view for explaining a main part of a conventional magnetic head cleaning device showing a portion of a cleaning member used for magnetic head cleaning.

[Explanation of symbols]

 2 cleaning member arm 4 head drum 6 rotating upper drum 7 head base 8 magnetic head 9 fixed drum 10 shaft 11 head mounting screw 21 cleaning member 23 rotation center shaft 24 notch 51 cleaning member 53 rotation center shaft 61 cleaning member

Claims (6)

[Claims] 1. A magnetic head cleaning device for cleaning the magnetic head by bringing a cleaning member rotatably supported into contact with a magnetic head provided on a rotary drum of a VTR or the like. A magnetic head cleaning device, wherein the cleaning member is arranged such that a rotation axis direction of the cleaning member is inclined in a predetermined direction with respect to a rotation axis direction of the rotating upper drum. 2. The magnetic head cleaning device according to claim 1, wherein the cleaning member is arranged such that a rotation axis direction of the cleaning member and a rotation axis direction of the rotary upper drum are orthogonal or substantially orthogonal to each other. Characteristic magnetic head cleaning device. 3. The magnetic head cleaning device according to claim 1, wherein the cleaning member is rotated by using the rotational force of the rotary drum as a power source. 4. The magnetic head cleaning device according to claim 2 or 3, wherein the cleaning member is arranged in a state where the magnetic head passes over a rotation center axis of the cleaning member. apparatus. 5. The magnetic head cleaning device according to claim 2 or 3, wherein the cleaning member is arranged in a state in which the magnetic head passes a position offset from the center axis of rotation of the cleaning member. Magnetic head cleaning device. 6. A magnetic head cleaning device for cleaning the magnetic head by bringing a cleaning member rotatably supported into contact with a magnetic head provided on a rotary drum of a VTR or the like. A magnetic head cleaning device having a shape asymmetric with respect to the rotation axis of the cleaning member.