JPH1064026A - Cleaning roll mechanism in magnetic head for rotary drum - Google Patents

Abstract

PROBLEM TO BE SOLVED: To polish the clogging of a head gap and deteriorated part of a tape sliding part in a magnetic head to improve a cleaning effect by providing a cleaning roll with a leaf spring as a peripheral speed difference generating means. SOLUTION: In the cleaning roll 17, an upper and lower sleeves 22, 23 are brought into contact with an upper and lower holders 20, 21, on the outer periphery of which the roll main body 18 is installed, so as to freely rotate, and the end of a plate spring 24 fixed to a supporting shaft 14 is subjected to press- contact to the wall face of the center hole 20b in the upper holder 20. Therefore, a frictional force is generated between the end of the plate spring 24 and the wall face of the upper holder 20 by a turning force applied from a middle drum 4 side, and the rotation of the cleaning roll 17 is prevented by the action of the frictional force. By this way, since the frictional force between the roll 17 and the magnetic head 5 is increased by providing the peripheral speed difference between the magnetic head 5 side and the roll 17 side, the brown stain adhered to the tape sliding part 5a is effectively removed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head for cleaning a magnetic head mounted on a rotary drum used in a magnetic recording / reproducing apparatus such as a VTR for recording and / or reproducing information signals on a tape-shaped magnetic recording medium. The present invention relates to a cleaning roller mechanism for a magnetic head for a rotating drum.

[0002]

2. Description of the Related Art Conventionally, a magnetic recording / reproducing apparatus which generally performs a helical scan for recording and / or reproducing an information signal using a rotating drum having a magnetic head, especially a high-end model such as a video tape recorder for business use is known. In order to prevent clogging of the head gap, which causes head clogs, and deterioration of the tape sliding portion, which lowers the level of audio and video signals during recording / reproduction, during recording / reproduction of the magnetic tape or A cleaning roller mechanism for cleaning the tape sliding portion during loading or unloading is provided.

As a cleaning roller mechanism for such a rotary drum magnetic head, for example, FIGS.
There is a configuration as shown in FIG. The rotating drum 1 includes a lower drum 2 fixed to a mechanical chassis, an upper drum 3 integrally fixed with a predetermined gap between the lower drum 2, and a rotatable drum between the upper and lower drums. And a plurality of magnetic heads 5 attached to the middle drum 4. The tape sliding portion at the tip of the magnetic head 5 projects laterally from the outer peripheral surface of the middle drum 4, and a cleaning roller mechanism 6 is attached to the rotating drum 1.

The cleaning roller mechanism 6 includes a cleaning roller 7 made of sponge, a rotating lever 8, an operation arm 9, an electromagnetic plunger 10, and base plates 11 and 2.
And a plurality of urging members 12, 13 and the like.
The cleaning roller 7 is rotatably supported by a support shaft 14 fixed to the end of the cleaning roller 7. The rotary lever 8 to which the cleaning roller 7 is attached is rotatably supported by a lever shaft 15 erected on the base plate 11, and the base plate 11 is screwed to the upper surface of the upper drum 3.

Further, an electromagnetic plunger 10 is attached to the base plate 11, and the electromagnetic plunger 1
The distal end of the zero-movable operating rod 10a is engaged with an operating arm 9 rotatably supported by a lever shaft 15 inside the rotating lever 8. One end of each of two urging members 12 and 13 is locked to the operation arm 9, and the other end of the first urging member 12 is connected to the base plate 1.
1, and the other end of the second biasing member 13 is locked to the rotating lever 8. The cleaning roller 7 installed to face the tape sliding portion of the magnetic head 5 is urged by the first urging member 12 in a direction away from the tape sliding portion, while the second urging member 12 is urged in the direction away from the tape sliding portion. Urging member 1
3 restricts movement in the direction away from the further tape sliding portion.

The cleaning roller mechanism 6 having such a configuration is used by rotating the cleaning roller 7 in contact with the rotating drum 1. That is, by pressing the cleaning roller 7 against the rotating drum 4 and the magnetic head 5, the cleaning roller 7 wipes the tape sliding portion to remove substances adhered to the surface, By polishing the degraded portion that has reached, the purpose of cleaning is achieved. From the viewpoint of the cleaning effect, when the cleaning roller 7 is used without being rotated, the frictional force between the cleaning roller 7 and the magnetic head increases, and the effect increases.

[0007]

However, in the cleaning roller mechanism of the magnetic head for a rotating drum as described above, the sponge itself used as the material of the cleaning roller does not contain an abrasive, and the cleaning is not performed. Since the roller is rotated by the middle drum and rotated at substantially the same peripheral speed, it may not be possible to remove even the substance adhering to the very surface of the tape sliding part. There has been a problem that the deteriorated portion that reaches the height cannot be polished, and the cleaning function cannot be effectively exerted.

That is, the cleaning roller 7 which is not in contact with the rotating drum 1 in the normal state is moved to the electromagnetic plunger 10.
Is operated to rotate the operation arm 9 and the rotation lever 8 to contact the magnetic head 5, the cleaning roller 7 contacts the tape sliding portion and also contacts the middle drum 4. Accordingly, the cleaning roller 7 is rotated by the driving force F ₁ of the middle drum 4 always in contact with the tape sliding portion while rotating.

At this time, the support shaft 14 of the cleaning roller 7 and the rotation axis of the rotary drum 1 are parallel to each other, and the cleaning roller 7 is rotated by the middle drum 4 in the same phase, and the driving force F _{2 of the} cleaning roller 7 is changed. Becomes substantially the same as the driving force F ₁ of the middle drum 4 and the cleaning roller 7
There is almost no difference between the peripheral speed of the magnetic head 5 and the peripheral speed of the magnetic head 5. Therefore, since the wiping action as described above does not occur between the cleaning roller 7 and the magnetic head 5, the brown stain adhering to the tape sliding portion cannot be removed at all.

A cleaning roller of a type in which a polishing sheet is attached to the outer periphery of a sponge is also conceivable for the purpose of improving the polishing property as compared with a sponge type cleaning roller. If the abrasiveness is too good, the wear of the magnetic head is too fast, while if the abrasiveness is too bad, there is no point in providing a polishing sheet. Therefore, it is necessary to set the optimal abrasiveness, but as a means of controlling the abrasiveness of the abrasive sheet, to change the abrasive sheet itself or to increase the roller pressing time that greatly affects the roller life, In any case, there is a problem that an enormous number of man-hours, costs, and the like are required to study for setting the optimal polishing property.

SUMMARY OF THE INVENTION The present invention has been made in view of such a problem, and does not require a large change in the cleaning roller, and uses a simple structure or means to provide a peripheral speed between the magnetic head and the cleaning roller. It is an object of the present invention to provide a cleaning roller mechanism that can easily remove the deposit on the tape sliding portion by generating the difference between the two.

[0012]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems and to achieve the above object, a cleaning roller mechanism for a magnetic head for a rotating drum according to the present invention comprises a magnetic head mounted on a rotating drum. In a cleaning roller mechanism of a magnetic head for a rotary drum for cleaning a magnetic head by contacting a cleaning roller, the cleaning roller is provided with a peripheral speed difference generating means for generating a peripheral speed difference between the magnetic roller and the peripheral speed of the magnetic head. It is characterized by:

With the above-described structure, in the cleaning roller mechanism of the magnetic head for a rotating drum according to the present invention, a difference in the peripheral speed is generated between the magnetic head and the cleaning roller, and the gap of the head gap of the magnetic head is reduced. The cleaning effect can be improved by polishing the clogged portion and the deteriorated portion of the tape sliding portion.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 to 4 show a first embodiment of the present invention. FIG. 1 is a perspective view showing the overall configuration, and FIG. 2 is a perspective view of a cleaning roller according to the present invention, in which a part of the first embodiment is omitted. , FIG. 3 is a plan view showing the state of use, and FIG. 4 is a longitudinal sectional view of the same. 5 and 6 show a second embodiment of the present invention. FIG. 5 is a front view showing a use state, and FIG. 6 is a plan view showing the use state.

FIGS. 7 and 8 show a third embodiment of the present invention. FIG. 7 is a perspective view of a cleaning roller according to a second embodiment of the present invention, in which a part of the cleaning roller is omitted, and FIG. It is a longitudinal section showing a state. 9 and 10 show a fourth embodiment of the present invention. FIG. 9 is a partially sectional front view showing the entire structure, and FIG. 10 is a plan view showing a use state. In FIGS. 1 to 10, FIGS.
The same parts as those in FIG. 13 are described with the same reference numerals.

The cleaning roller mechanism 16 of the rotary drum magnetic head according to the first embodiment of the present invention shown in FIGS. 1 to 4 uses a leaf spring as a peripheral speed difference generating means. The rotating drum 1 has a three-layer structure in which three disk-shaped members are stacked in three stages, and is attached to a mechanical chassis (not shown) obliquely so that the center line of the rotating shaft is inclined. The rotary drum 1 is provided with a lower drum 2
Is fixed to the mechanical chassis, and the upper drum 3
Are fixed integrally with the lower drum 2 via a connecting member (not shown) with a predetermined gap therebetween. A middle drum 4 is rotatably interposed in a space formed between the upper drum 3 and the lower drum 2.

A plurality of magnetic heads 5, 5 are attached to the lower portion of the middle drum 4 at predetermined intervals in the circumferential direction. The tape sliding portion 5 at the tip of the magnetic head 5
a protrudes laterally from the outer peripheral surface of the middle drum 4, a tape-shaped magnetic recording medium wound obliquely around the rotary drum 1 comes into contact with the tape sliding portion 5a. A new magnetic recording of the information signal is performed,
Alternatively, reproduction of an information signal recorded in advance is performed. Then, cleaning of the magnetic head 5 by the cleaning roller mechanism 16 is performed during the tape running or during loading or unloading.

The cleaning roller mechanism 16 includes a cleaning roller 17 which comes into contact with the tape sliding portion 5a of the magnetic head 5, a rotating lever 8, an operating arm 9, an electromagnetic plunger 10, a base plate 11, and two urging members. 1
2, 13 and the like. The rotating lever 8 has a support portion 8a formed in a U-shape, and a lever portion 8b formed in a substantially L shape having one end continuous with the support portion 8a. Is formed with a shaft support piece 8c. An upper end of a support shaft 14 protruding downward is fixed to the shaft support piece 8c by fixing means such as caulking, and a cleaning roller 17 is rotatably supported below the support shaft 14.

As shown in detail in FIGS. 2 to 4, the cleaning roller 17 includes a sponge roller body 18, a pair of upper and lower holders 20, 21 to which the roller body 18 is fitted and fixed. A pair of upper and lower sleeves 22 and 23 which are fitted and fixed to the lower holder 21 from above and below, and a leaf spring 24 which is a specific example of a peripheral speed difference generating means fixed to the support shaft 14 in a hole of the upper holder 20. Have. The roller body 18 has a cylindrical shape and is fitted to the outer peripheral surfaces of a pair of holders 20 and 21 fitted and fixed from above and below, and is prevented from coming off in the axial direction by upper and lower flange portions 20a and 21a. .

Further, at the upper end of the lower holder 21, there is provided a fitting portion 21b into which the lower end of the upper holder 20 is fitted, whereby the upper and lower holders 20, 21 are positioned. The pair of sleeves 22 and 23 are rotatably fitted in the center hole 21 c of the lower holder 21 from above and below. The support shaft 14 is press-fitted into the upper and lower sleeves 22 and 23, whereby the support shaft 14 and the upper and lower sleeves 22 and 23 are integrally formed.
Upper and lower holders 20 and 21 are rotatably supported by 2 and 23.

The leaf spring 24 is formed of a rectangular thin plate, and is fixed to the support shaft 14 with one end in the longitudinal direction wound around the outer periphery of the support shaft 14. The leaf spring 24 extends in the horizontal direction, and the other end in the longitudinal direction is in contact with the wall surface of the center hole 20 b of the upper holder 20.
As a material of the leaf spring 24, not only a synthetic resin material but also a metal material or another spring material can be used. As the material of the upper and lower holders 20, 21, various materials such as a synthetic resin material and a metal material are used as long as they can generate an appropriate magnitude of frictional force with the leaf spring 24 described above. be able to.

The rotating lever 8 to which the cleaning roller 17 having such a configuration is attached is rotatably supported by inserting a lever shaft 15 erected on the base plate 11 through the supporting portion 8a. Axis 1
The stopper ring 25 engaged with the distal end of the lever 5 prevents the lever shaft 15 from coming off. A cylindrical shaft portion of the operation arm 9 is disposed inside the support portion 8a of the rotating lever 8, and a lever shaft 15 is inserted through the cylindrical shaft portion.

The operating arm 9 has an arm portion 9a projecting forward of an electromagnetic plunger 10 fixed on a base plate 11, and this arm portion 9a
0 is rotatably connected to the distal end of an operating rod 10a that protrudes from one end so as to advance and retreat. One end of a coil spring 12 as a first urging member is locked to a spring receiving piece 11a provided on the base plate 11, and the other end of the coil spring 12 is locked to a spring receiving portion 9b of the operation arm 9. ing. The operating rod 10 a is constantly urged to the projecting side via the operation arm 9 by the urging force of the coil spring 12. Further, the movement of the electromagnetic plunger 10 on the forward side is restricted by restricting the movement of the operation arm 9 by the stopper piece 11b provided on the base plate 11.

Further, one end of a coil spring 13 as a second urging member is locked to the spring receiving portion 9b of the operation arm 9, and the other end of the coil spring 13 is engaged with the supporting portion 8a of the rotating lever 8. Has been stopped. The turning lever 8 is constantly urged toward the operation arm 9 by the urging force of the coil spring 13, and the movement of the turning lever 8 by the urging force is restricted by the operation arm 9. In addition, 26 shown in FIG. 1 is a shield case for the electromagnetic plunger 10.

The cleaning roller mechanism 16 having such a configuration is connected to the upper drum 3 via the base plate 11.
It is screwed to the upper surface of. The cleaning roller 17 of the cleaning roller mechanism 16 is disposed so as to correspond to the rotational movement trajectory of the magnetic head 5 attached to the middle drum 4 of the rotating drum 1. The cleaning roller 17 approaches the rotary drum 1 by operating the electromagnetic plunger 10 to retract the operating rod 10a without contacting the tape sliding portion 5a of the head 5, so that the middle drum 4 and the magnetic head 5 is contacted.

The cleaning roller mechanism 16 attached to the rotary drum 1 in this manner is used as follows, for example, during recording / reproducing traveling of a magnetic tape, or during loading or unloading. First, when the electromagnetic plunger 10 is operated to move the operating rod 10a backward against the urging force of the first coil spring 12, the operating arm 9 rotates counterclockwise around the lever shaft 15 in FIG. Move. Thus, the turning lever 8 urged toward the operation arm 9 by the spring force of the second coil spring 13 is turned integrally with the operation arm 9.

As a result, the rotating lever 8 is rotated counterclockwise about the lever shaft 15 and the cleaning roller 17 is rotated.
Approaching the rotating drum 1 and the middle drum 4 and the magnetic head 5
Is contacted. At this time, the middle drum 4 and the magnetic head 5
Is rotated at a constant speed by a driving force of a motor (not shown) for rotationally driving the roller, and the rotating force is transmitted from the roller body 18 to the cleaning roller 17.

On the other hand, the cleaning roller 17
The upper and lower sleeves 22, 23, into which the support shaft 14 is press-fitted and integrated in the rotational direction, and the upper and lower holders 20, 21 around which the sponge roller body 18 is mounted are free to rotate. However, the tip of a leaf spring 24 fixed to the support shaft 14 is pressed against the wall surface of the center hole 20 b of the upper holder 20. For this reason, a frictional force is generated between the tip of the leaf spring 24 and the wall surface of the upper holder 20 by the rotational force applied from the middle drum 4 side, and the frictional force is generated by the cleaning roller 1.
7 acts to prevent rotation.

As a result, a peripheral speed difference occurs between the peripheral speed of the middle drum 4 and the magnetic head 5 and the peripheral speed of the cleaning roller 17. By providing a peripheral speed difference between the magnetic head 5 side and the cleaning roller 17 side in this way,
Since the frictional force between the cleaning roller 17 and the magnetic head 5 increases, even with the sponge roller body 18, the brown stain attached to the tape sliding portion 5 a of the magnetic head 5 is effectively removed. be able to.

Incidentally, according to the test conducted by the present inventors,
In the case of a conventional cleaning roller having a roller main body with an abrasive sheet affixed to the outer periphery thereof and not providing the above-described peripheral speed difference, the brown stain adhering to the tape sliding portion is completely removed. I couldn't do it,
In the type in which the cleaning roller 17 is hardly rotated by the cleaning roller mechanism 16 of this embodiment, the above-described brown stain can be efficiently removed.

In the above-described embodiment, an example in which the leaf spring 24 is used as the peripheral speed difference generating means has been described. However, the present invention is not limited to this, and various types such as a coil spring, a spiral spring, and a bamboo spring are used. Spring material can be used. Further, without being limited to the spring material, a rubber-like elastic body such as synthetic rubber or natural rubber can be used.

In the second embodiment of the present invention shown in FIGS. 5 and 6, the peripheral speed difference generating means is constituted by changing the attitude of the cleaning roller 27 without providing a special member such as the leaf spring 24. It was done. The cleaning roller 27 of the cleaning roller mechanism 26 is configured as shown in FIG.
The cleaning roller 27 has the same structure as the conventional cleaning roller 7 shown in FIG. 2 and the like, and the structure is not changed. Therefore, the cleaning roller 27 is not particularly described here. The center line L is set so as to be appropriately inclined by an angle θ with respect to a center line C of a rotation shaft 31a serving as a rotation center of the rotation drum 31.

The rotating drum 31 has a two-layer structure of a lower drum 32 and an upper drum 33. The lower drum 32 is fixed to a mechanical chassis.
3 is rotatably supported. And the magnetic head 3
Numeral 5 is attached to the upper drum 33, and the cleaning roller 27 is disposed outside the rotational movement locus of the magnetic head 35.
Are installed to face each other. The cleaning roller mechanism 26 is attached to the lower drum 32 or the mechanical chassis on the fixed side.

In the case of the second embodiment, the cleaning roller 27 is brought close to the rotating drum 31 and the roller body is brought into contact with the magnetic head 35 and the upper drum 33.
Is rotated. At this time, as shown in FIG. 5, assuming that the driving force on the upper drum 33 side is E, the cleaning roller 27
Has a driving force F (E
= F) acts. The driving force F of the cleaning roller 27 has a tangential component force Fa in the tangential direction and a normal direction in the normal direction because the rotation direction of the cleaning roller 27 is inclined by the angle θ with respect to the center line L of the support shaft 14. The cleaning roller 27 is rotated by the tangential component Fa.

There is a relationship of F × cos θ = Fa between the tangential component force Fa and the driving force F, and cos θ is 1
Since it is a smaller value, F> Fa. Therefore, a peripheral speed difference occurs between the peripheral speed of the upper drum 33 and the peripheral speed of the cleaning roller 27, and the peripheral speed difference causes a difference between the peripheral surface of the roller body of the cleaning roller 27 and the tape sliding portion. The friction force increases. Therefore, the polishing force by the roller body is increased in the same manner as described above, and it is possible to remove the deposits adhering to the tape sliding portion and exhibit the cleaning effect.

In the third embodiment of the present invention shown in FIGS. 7 and 8, a disk-shaped friction member 39 is provided in place of the leaf spring 24 of the first embodiment described above, and the peripheral speed is changed by the friction member 39. This constitutes a difference generating means. The cleaning roller 37 of the cleaning roller mechanism includes a roller body 3.
8, a pair of upper and lower holders 40 and 41 to which the roller body 38 is fitted and fixed, a pair of upper and lower sleeves 42 and 43 to be fitted and fixed to the holders 40 and 41 from above and below, And a friction member 39 as a peripheral speed difference generating means disposed. The roller body 38 is cylindrical and has a pair of holders 40 fitted and fixed from above and below.
41, the upper and lower flange portions 40a, 4
1a prevents slipping out in the axial direction. The flange 40a of the upper holder 40 is
Reference numeral 9 also serves as a pressure receiving portion to be contacted.

Further, the upper sleeve 42 is fitted in the center hole of the upper holder 40, and the lower sleeve 43 is fitted in the center hole of the lower holder 41, so that the upper and lower holders 40 and 41 and the upper and lower sleeves 42 and 43 are fitted. Is rotatable.
The support shaft 14 is press-fitted into the upper and lower sleeves 42 and 43, whereby the support shaft 14 and the upper and lower sleeves 42 and 43 are pressed.
43 are integrally formed. A friction member 39 is integrally formed on the support shaft 14 by a fixing means such as press-fitting, and a ring-shaped friction portion 39 a protruding from the lower surface of the friction member 39 is formed by a flange portion 40 a of the upper holder 40.
Is in contact with

Thus, according to the third embodiment, the friction member 39 fixed to the support shaft 14 comes into contact with the upper and lower holders 40 and 41 on the roller body 38 side rotatably supported by the support shaft 14. Therefore, the frictional force generated between the friction member 39 and the upper holder 40 causes the roller body 3
8 is limited. The friction member 39 causes a peripheral speed difference between the peripheral speed of the intermediate drum 4 and the peripheral speed of the cleaning roller 37, and the peripheral speed difference causes the peripheral surface of the roller body of the cleaning roller 37 to tape slide. The frictional force with the moving part increases. Therefore, the polishing force by the roller body is increased in the same manner as described above, and it is possible to remove the deposits adhering to the tape sliding portion and exhibit the cleaning effect.

In the third embodiment, the example in which the friction member 39 is provided above the upper holder 40 has been described. However, the friction member 39 may be provided below the lower holder 41. The friction members 39 may be provided on both upper and lower sides of the holders 40, 41.

The fourth embodiment of the present invention shown in FIGS.
In this embodiment, the cleaning roller is not rotationally driven by the rotational force of the rotary drum 1, but a motor for positively driving the cleaning roller is provided. This motor is used as a peripheral speed difference generating means, and the cleaning roller and the magnetic head are used. And a peripheral speed difference is generated. The cleaning roller 47 of the cleaning roller mechanism includes a roller body 48, a pair of upper and lower holders 50 and 51 to which the roller body 48 is fitted and fixed, and an upper holder 5.
Motor 4 as a peripheral speed difference generating means disposed above
9 is provided.

The motor 49 is connected to the rotating lever 8 described above.
Is fixed to the shaft support piece 8c. The rotating shaft 49a of the motor 49 penetrates through the hole of the shaft supporting piece 8c and protrudes downward, and upper and lower holders 50 and 51 are fixed to the distal end thereof by fixing means such as press fitting. The roller body 48 is fitted into the upper and lower holders 50 and 51 to be integrally formed.

The direction of rotation of the motor 49 is, as shown in FIG. 10, in a direction (the same direction) opposite to each other at a contact portion with the middle drum 4, that is, in a direction opposite to the direction following the rotation of the rotary drum 1. Preferably, the cleaning roller 47 is rotated. Cleaning roller 4 in that direction
This is because, by rotating the magnetic head 7, the peripheral speed difference with the magnetic head 5 can be further increased, and the cleaning efficiency can be increased. However, if the rotation direction of the cleaning roller 47 is a rotation speed at which a peripheral speed difference can be generated between the cleaning roller 47 and the rotation drum 1, the rotation direction of the cleaning roller 47 is opposite to that of the rotation drum 1, that is,
It may be configured to rotate in a direction to rotate 7. Further, the motor 49 may be provided below the lower holder 51.

The rotation of the cleaning roller 47 starts, for example, simultaneously with the input of the cleaning start signal of the magnetic head 5 or immediately before the cleaning roller 47 comes into contact with the rotating drum 1. When the rotating cleaning roller 47 contacts the tape sliding portion of the magnetic head 5,
Due to the peripheral speed difference between the peripheral speed of the outer peripheral surface of the cleaning roller 47 by the motor 49 and the peripheral speed of the magnetic head 5 protruding from the outer peripheral surface of the middle head 4, the brown stain adhering to the tape sliding portion 5a is removed by the cleaning roller. 47 to effectively remove the deposits on the surface. The circumferential speed of the magnetic head 5 and the cleaning roller 47 may be higher for the magnetic head 5 and may be higher for the cleaning roller 47.

As described above, the present invention is not limited to the above embodiment. For example, in the above embodiment, an example in which a sponge is formed in a cylindrical shape as a roller body has been described. Various types of cleaning rollers can be applied, such as a cylindrical brush type in which a brush is provided and a type in which an abrasive sheet is attached to the outer periphery of a cylindrical sponge. Furthermore, in the above embodiment, four types of embodiments were described as the peripheral speed difference generating means. However, the present invention is not limited to this, and the peripheral speed difference between the cleaning roller and the magnetic head is determined. Various means can be applied as long as they cause the occurrence.
Thus, the present invention can be variously modified without departing from the spirit thereof.

[0045]

As described above, according to the present invention,
Since the cleaning roller is provided with a peripheral speed difference generating means, a peripheral speed difference is generated between the magnetic head and the cleaning roller to polish a clogged head gap of the magnetic head and a deteriorated portion of the tape sliding portion. Cleaning effect can be improved. Therefore, it is possible to obtain an effect that the attached matter on the tape sliding portion can be effectively removed with a simple configuration without requiring a large change of the cleaning roller.

[Brief description of the drawings]

FIG. 1 is a perspective view of an overall configuration showing a first embodiment of a cleaning roller mechanism for a rotary drum magnetic head according to the present invention.

FIG. 2 is a perspective view showing a cross section of a part of a cleaning roller according to a first embodiment of the cleaning roller mechanism of the magnetic head for a rotating drum of the present invention.

FIG. 3 is a plan view showing a use state of the cleaning roller according to the first embodiment of the cleaning roller mechanism of the magnetic head for a rotary drum of the present invention.

FIG. 4 is a sectional view showing a use state of the cleaning roller according to the first embodiment of the cleaning roller mechanism of the magnetic head for a rotary drum of the present invention.

FIG. 5 is a front view for explaining a use state showing a second embodiment of the cleaning roller mechanism of the magnetic head for a rotary drum according to the present invention.

FIG. 6 is a plan view for explaining a use state of a second embodiment of the cleaning roller mechanism of the magnetic head for a rotary drum according to the present invention.

FIG. 7 is a perspective view showing a cross section of a part of a cleaning roller according to a third embodiment of the cleaning roller mechanism of the magnetic head for a rotary drum of the present invention.

FIG. 8 is a cross-sectional view illustrating a use state of a cleaning roller according to a third embodiment of the cleaning roller mechanism of the magnetic head for a rotary drum of the present invention.

FIG. 9 is a front view for explaining a use state of a cleaning roller mechanism of a magnetic head for a rotary drum according to a fourth embodiment of the present invention.

FIG. 10 is a plan view for explaining a use state showing a fourth embodiment of the cleaning roller mechanism of the magnetic head for a rotary drum according to the present invention.

FIG. 11 is a perspective view of the overall configuration showing a cleaning roller mechanism of a conventional magnetic head for a rotating drum.

FIG. 12 is a cross-sectional view showing a usage state of a cleaning roller of a conventional cleaning roller mechanism for a magnetic head for a rotating drum.

FIG. 13 is a plan view for explaining a usage state showing a cleaning roller mechanism of a conventional magnetic head for a rotating drum.

[Explanation of symbols]

1, 31 rotating drum, 4 middle drum, 5 magnetic head, 5a tape sliding section, 8 rotating lever, 9
Operation arm, 10 electromagnetic plunger, 11 base plate, 12, 13 biasing member, 16, 26
Cleaning roller mechanism, 17, 27, 37, 47
Cleaning roller, 18, 38, 48 Roller body, 24 Leaf spring (peripheral speed difference generating means), 33 Upper drum, 39 Friction member (peripheral speed difference generating means), 49
Motor (peripheral speed difference generating means)

Claims (5)

[Claims] 1. A cleaning roller mechanism of a magnetic head for a rotating drum for cleaning a magnetic head by bringing a cleaning roller into contact with a magnetic head attached to the rotating drum, wherein the cleaning roller has a peripheral speed of the magnetic head and a circumferential speed of the magnetic head. A cleaning roller mechanism for a magnetic head for a rotary drum, wherein a peripheral speed difference generating means for generating a peripheral speed difference is provided. 2. The cleaning roller mechanism for a rotary drum magnetic head according to claim 1, wherein said peripheral speed difference generating means includes a frictional force between a support shaft rotatably supporting said cleaning roller and said cleaning roller. A cleaning roller mechanism for a magnetic head for a rotating drum, comprising an urging member for causing the rotation. 3. A cleaning roller mechanism for a rotary drum magnetic head according to claim 1, wherein said peripheral speed difference generating means sets a center line of a support shaft rotatably supporting said cleaning roller to a rotation shaft of said rotary drum. A cleaning roller mechanism for a magnetic head for a rotary drum, wherein the cleaning roller mechanism is configured to be inclined at an appropriate angle without intersecting the center line of the magnetic head. 4. A cleaning roller mechanism for a rotary drum magnetic head according to claim 1, wherein said peripheral speed difference generating means has a frictional force between a cleaning shaft and a support shaft rotatably supporting said cleaning roller. A cleaning roller mechanism for a magnetic head for a rotary drum, wherein a cleaning member is provided with a friction member for causing the friction. 5. The cleaning roller mechanism for a rotary drum magnetic head according to claim 1, wherein said peripheral speed difference generating means includes a motor for rotating said cleaning roller at a peripheral speed different from the peripheral speed of said rotary drum. A cleaning roller mechanism for a magnetic head for a rotating drum.