JPH10105931A - Magnetic head cleaning device - Google Patents

Abstract

(57) Abstract: A magnetic head cleaning device for cleaning a magnetic head mounted on a rotary head device,
The effect of removing deposits on the magnetic head is improved. SOLUTION: A head cleaning roller 31 rotatably supported by a shaft by a magnetic head cleaning device.
Are formed by laminating a large number of polishing sheets 32 in the axial direction of the roller core body, and are polished by being rolled and contacted so as to be sandwiched between the protrusions of the magnetic head H mounted on the rotating drum 2 of the rotating head device 5. Make sure that cleaning is done.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information signal recording / reproducing apparatus for performing helical scanning on a tape-shaped recording medium such as a video tape recorder (hereinafter, referred to as a VTR), a data recorder, and an audio tape recorder. The present invention relates to a magnetic head cleaning device for cleaning a magnetic head.

[0002]

2. Description of the Related Art For example, in an information signal recording / reproducing apparatus for performing a helical scan on a tape-shaped recording medium such as a VTR, clogging of a head gap which causes a head clock of a magnetic head provided in a rotating drum. In order to prevent the tape sliding part from deteriorating, which may cause a level drop, the tape sliding part of the magnetic head during recording / reproducing travel or during loading and unloading operations of a magnetic tape as a tape-shaped recording medium. Some have a magnetic head cleaning device equipped with a head cleaning roller for cleaning the head.

In this conventional magnetic head cleaning device, as shown in FIG. 7, a head cleaning roller 15 is attached to a rotating drum 2 on which a magnetic head H is mounted by using a magnetic tape T.
Rolled on the non-wound portion side of
The cleaning is performed by bringing the magnetic head H into contact with the sliding surface of the tape by rotating and driving with the rotation of the magnetic head H.
As an example, it is configured as shown in FIGS.

The magnetic head cleaning apparatus 1 shown in FIG. 9 has a rotary drum on which a magnetic head H (H ₁ , H ₂ ) is mounted with a tape sliding portion, which is a surface on which a magnetic gap is formed, projecting a predetermined amount from a peripheral surface. It is provided in a rotary head device 5 configured by arranging fixed drums 3 and 4 coaxially above and below the rotary drum 2.

The magnetic head cleaning device 1 includes a vertically extending arm member 12 and a support shaft 13 at a base end 12a, which is an upper end, on a mounting substrate 11 mounted on the upper surface of the upper fixed drum 3 of the rotary head device 5. As a result, the free end portion 12b, which is a lower end portion, is rotatably supported on and away from the peripheral surface of the rotary head device 5 so as to correspond to the peripheral surface of the rotary drum 2. A shaft 14 is fixed to the free end portion 12b of the arm member 12 in a hanging manner, and a cleaning roller 15 is rotatably supported by the shaft 14 so as to correspond to the rotational movement locus of the magnetic head H of the rotary drum 12. I have.

The arm member 12 on which the cleaning roller 15 is supported is mounted on a mounting substrate 11 and is coaxially mounted on the support shaft 13 by an electromagnetic plunger 17 housed in a shield case 16. It is rotationally driven via the supported operating body 18. A base end portion 12a of the arm member 12 that is supported by the support shaft 13 is formed in a substantially U-shape having upper and lower bearing surfaces 12a ₁ and 12a _2, and is supported between the bearing surfaces 12a ₁ and 12a ₂ . An operating body 18 is rotatably supported at its base end on the shaft 13, and a distal end 18 a is engaged with a plunger 17 a of the electromagnetic plunger 17.

[0007] The arm member 12 and the actuating member 18, which is formed corresponding perpendicular to the upper bearing surface engaging projection 12c and the other side edge protruding from the one side edge of 12a ₁ of the arm member 12 The locking piece 12d is rotatable with each other within a range where the locking piece 12d abuts on a protrusion 18b protruding from the upper surface of one side edge of the operating body 18 and a protrusion formed on the other side edge.

Further, between the arm member 12 and the operating body 18,
Specifically, the spring hook 18c formed at one side edge portion of the operating member 18 and the upper bearing surface 12a ₁ of the distal end of the arm member 12
And a limiter spring 19 composed of a tension coil spring for urging the arm member 12 in one direction with respect to the operating body 18, that is, in the circumferential direction of the rotary head device 5 (counterclockwise in FIG. 7). Is stretched. Also, a spring hooking piece 11 formed upright at an edge of the mounting plate 11.
a and the spring body 18 c of the operating body 18, the operating body 1
8 is rotated to urge the electromagnetic plunger 17 engaged therewith.
A return spring 20, which is a tension coil spring for sliding the plunger 17a in the return direction, is stretched.

The operating member 18 which is rotationally biased by the return spring 20 has a locking piece 11b which is formed upright at the edge of the mounting substrate 11 at a rotational position where the plunger 17a of the electromagnetic plunger 17 is returned. A projection formed on the end face of the distal end portion 18a engaged with the plunger 17a is abutted and locked.

In the conventional magnetic head cleaning apparatus 1 constructed as described above, the cleaning roller 15 rotatably supported by the arm member 12 has a roller body 15a formed by a sponge as shown in FIG. And a cylindrical roller core 15d provided with flanges 15b and 15c on the upper and lower sides of the arm member 12 at the center thereof.
The roller 14 is rotatably supported by a roller core 15d on a shaft 14 fixed to the free end portion 12b in a hanging manner.

The magnetic head cleaning device 1 thus configured operates the electromagnetic plunger 17 in a predetermined operation when the rotary head device 5 to which the magnetic head cleaning device 1 is mounted, that is, when the rotary drum 2 on which the magnetic head H is mounted is rotated. The cleaning operation of the magnetic head H is performed by energizing according to the signal.

That is, when the electromagnetic plunger 17 is energized, the plunger 17a is suctioned, and this plunger 1
7a is rotated around the support shaft 13 against the urging force of the return spring 20,
Due to the rotation of the operating body 18, the arm member 12 is moved to the base end 1.
At 2a, the rotating head device 5 is rotated in the circumferential direction of the rotary head device 5 about the support shaft 13 integrally with the operating body 18 by being pulled by the limiter spring 19.

A cleaning roller 15 rotatably supported on a free end 12b by a shaft 14 by the rotation of the arm member 12 is provided on the circumferential surface of the rotary drum 2 by a magnetic head H.
Are rolled and contacted on the rotational movement trajectory. In this state, the arm member 12 is in a state separated from the operating body 18,
The cleaning roller 15 is pressed against the peripheral surface of the rotary drum 2 at a required pressure by the urging force of the limiter spring 19 and is rotated about the shaft 14 as the rotary drum 2 rotates.

As described above, the magnetic head H corresponds to the cleaning roller 15 which is brought into contact with the peripheral surface of the rotating drum 2 at a required pressure by rotation of the rotating drum 2, and the tape sliding portion of the cleaning roller 15 is Roller body 15
The tape sliding portion of the magnetic head H is cleaned by being rubbed by contacting the peripheral surface of the magnetic head H. The contact pressure of the cleaning roller 15 against the rotating drum 2 during this cleaning operation is set by the spring constant of the limiter spring 19.

[0015]

As described above, in the conventional head cleaning roller 15 provided in the magnetic head cleaning device 1, as shown in FIG. 8, the roller body 15a is formed using a sponge as it is. By pressing against the peripheral surface of the rotating drum 2, this pressing surface is in a crushed state, and due to its elasticity, it comes into contact with the protrusion including the tape sliding portion of the magnetic head H,
An attempt is made to remove deposits adhering to the protrusion of the magnetic head.

However, the sponge itself forming the roller body 15a has flexibility, and since the sponge does not contain an abrasive, the polishing force is small. For this reason, the head cleaning roller 15 slips irregularly with respect to the rotating drum 2 and cannot completely remove the deposits on the magnetic head H. Conversely, the head cleaning roller 15 may cause clogging of the head gap. In addition, the sponge roller body 15a has disadvantages such as easy wear and short service life.

Further, a head cleaning roller having the structure shown in FIGS. 10 and 11 has been proposed in order to improve the abrasiveness of the head cleaning roller.

This head cleaning roller 21
An adhesive medium 23 is adhered to the outer periphery of a roller body 22 formed by a sponge, and a polishing sheet 24 is wound and adhered through the adhesive medium 23. The head cleaning roller 21 thus formed has an abrasive sheet 24 adhered to the outer periphery of a sponge roller body 22, so that the abrasion of the magnetic head is improved, but the abrasive sheet 24 itself is rigid. In addition, since the adhesive medium 23 is interposed between the sponge roller body 22 and the sponge roller main body 22, the roller comes into contact with the rotating drum 2 as shown in FIG. That is, the spacing s occurs at the center of the tape sliding surface of the magnetic head H.

For this reason, there may be cases where it is impossible to remove the deposits adhered to the tape sliding surface of the magnetic head H or clog the gap portion of the tape sliding surface. There is a problem that dust and the like cannot be removed from the details on the upper and lower surfaces, and conversely dust and the like accumulate in these details.

The present invention has been made in view of the above points, and improves the effect of removing adhering matter from a magnetic head mounted on a rotary drum, and ensures stable rotation by reliably transmitting the driving force from the rotary drum. It is an object of the present invention to provide a magnetic head cleaning device provided with a head cleaning roller that can be used.

[0021]

In order to achieve the above object, the present invention provides a magnetic head mounted on a rotating drum of an information signal recording / reproducing apparatus by a head cleaning roller which is rotated while being pressed against the rotating drum. In a magnetic head cleaning device designed to perform cleaning, a head cleaning roller is formed by laminating polishing sheets in the axial direction of a roller core.

As described above, since the head cleaning roller is formed by laminating the abrasive sheets in the axial direction of the roller core, the cleaning roller has an outer peripheral surface having rigidity in the circumferential direction. On the other hand, the rotating sheet is rolled in a state close to the rigid roller, the rotational force from the rotating drum is reliably transmitted and the rotating sheet is rotated stably, and the abrasive sheet laminated on the magnetic head protruding on the peripheral surface of the rotating drum is sandwiched In this state, the polishing sheet comes into contact in a wavy shape, and the cleaning is performed so as to contact the details and peel off the attached matter in an abrasive manner and to remove it, and the attached matter can be almost completely removed, The removal effect is improved.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a magnetic head cleaning apparatus according to the present invention will be described below with reference to FIGS. As the moving mechanism for separating and moving, a structure similar to that of the conventional example shown in FIG. 9 described above can be used. Therefore, FIG. 1 shows a structure similar to that shown in FIG. The description of the head cleaning roller will be omitted, and the description thereof will be omitted.

First, a first example of the head cleaning roller will be described with reference to FIGS.

The head cleaning roller 31 of this embodiment
Is a polishing sheet 3 formed in a disk shape having the same diameter as the roller diameter.
2 are inserted into a roller core 33 having a shaft hole and laminated so as to have a predetermined height in the axial direction, that is, a predetermined roller length.
4a and 34b are formed so as to be held in a squeezed state.

In the thus-formed head cleaning roller 31 of this example, the polishing sheet 32
A resin sheet or a nonwoven fabric impregnated with an abrasive, a resin sheet or a nonwoven fabric having an abrasive adhered to the surface, or the like is used.
No. 00 and GC10000 are preferred.

The head cleaning roller 31 thus formed has a laminated structure in which a polishing sheet 32 having rigidity is laminated at a predetermined height as shown in FIG. As a result, the head cleaning roller 31 is rotated in a state close to the rigid roller with respect to the rotary drum 2, and the rotational force required for rotation is reliably transmitted from the rotary drum 2, and the head cleaning roller 31 is rotated stably.

The head cleaning roller 31 rotated in this manner is brought into contact with the magnetic head H mounted on the rotating drum 2 so as to sandwich the polishing sheet 32 having its protruding portion as shown in FIG. In this state, the polishing sheet 32 comes into contact with the projecting portion of the magnetic head H in a wavy manner, so that the polishing sheet 32 not only contacts the tape sliding surface, which is the tip end surface of the magnetic head H, but also contacts the upper and lower details. In addition, it is possible to remove the adhered substance by polishing to remove the deteriorated layer extending to the deep layer.

FIGS. 5 and 6 show a second example of a head cleaning roller. The head cleaning roller 41 of this example has a disk-like shape having the same diameter as the roller as in the first example described above. Sheet 42 and non-abrasive sheet 4
3 are alternately inserted into the roller core 44 and stacked so as to have a predetermined height in the axial direction, that is, a predetermined roller length.
It is formed while being held in a squeezing shape by 44b.

In the thus-formed head cleaning roller 41 of the present embodiment, the abrasive sheet 42 is formed of a resin sheet impregnated with an abrasive, a nonwoven fabric, or the like, and the abrasive is adhered to the surface. It is formed from a resin sheet, a nonwoven fabric, or the like. The non-abrasive sheet 43 is formed from a nonwoven fabric or the like.

The head cleaning roller 41 thus formed also has a laminated structure in which the abrasive sheet 42 having rigidity and the non-abrasive sheet 43 formed of a non-woven fabric are alternately laminated and laminated. With the required rigidity, the rotating drum is rolled with almost no deformation and the rotational force required for rotation is reliably transmitted, so that the head cleaning roller 41 rotates stably.

The head cleaning roller 41 rotated in this manner is a magnetic head H mounted on a rotating drum.
In the same manner as in the first example described above, the protruding portions are rolled so as to be sandwiched between the abrasive sheet 42 and the non-abrasive sheet 43 which are stacked, and the abrasive sheet 42 and the non-abrasive sheet 43 Will come into contact with each other.

The contact between the abrasive sheet 42 and the non-abrasive sheet 43 with respect to the magnetic head is caused by the fact that the rolling contact position of the head cleaning roller 41 with respect to the rotating drum slightly changes in the axial direction as the rotating drum rotates. Since the contact position also changes, the polishing sheet 42 contacts the magnetic head only on one side and the non-polishing sheet 43 contacts only the other side, and the polishing sheet 42 and the non-polishing sheet 43 As a result, the polishing head 42 comes into contact with the polishing sheet 42 from the tape sliding surface, which is the front end surface, to the upper and lower surfaces in the same manner as in the above-described first example. Can be peeled off.

As described above, the head cleaning roller 41 contacts the surface of the magnetic head where the abrasive sheet 42 and the non-abrasive sheet 43 alternately oppose each other, that is, the abrasive sheet 42 contacts the half surface of the magnetic head. Since the non-abrasive sheet 43 made of non-woven fabric or the like comes into contact with the other half surface, the slidability with the magnetic head is improved. In particular, the polishing of the magnetic head is half the rate of the first example described above and is unnecessary. Polishing is prevented.

The first example of a head cleaning roller (hereinafter referred to as a first example roller) 3 formed as described above.
A head cleaning roller (hereinafter, referred to as a roller of Conventional Example 1) 15 in which a head cleaning roller (hereinafter, referred to as a second example roller) 42 of the first and second examples and a conventional roller body shown in FIG. A cleaning roller (hereinafter, referred to as a roller of Conventional Example 2) 21 in which a polishing sheet 23 is wound and adhered to a peripheral surface of a roller body 22 formed by a sponge shown in FIG. did.

In this comparative experiment, the head cleaning rollers 31 and 41 of the first and second examples are the same as those of the conventional example 1.
It was possible to remove the deposits that could not be removed by the roller 15.

An experiment for grasping the removal efficiency is as follows.
Oily ink is adhered to the tape sliding surface of the magnetic head mounted on the rotating drum as a deposit, and each cleaning roller is pressed against the rotating drum at a predetermined pressure to rotate the rotating drum at a normal rotation speed (90 ° rotation / Second) to rotate the magnetic head to the cleaning roller by 0.5
The time until the oil-based ink was completely removed by being rolled and contacted 45 times per second was measured.

As a result, the roller 15 of the conventional example 1 is removed even after the time when the oil-based ink adhering to the magnetic head is removed by the first example roller 31, the second example roller 41, and the roller 21 of the second conventional example. Could hardly be wiped off with a sponge roller. In addition, the wiping completion time of the first example roller 31 and the second example roller 41 was almost the same time, and the time was less than one fifth of the roller 21 of the second conventional example.

From the results of this experiment, the sponge type roller 15 of the prior art 1 was more excellent than the other cleaning rollers.
The roller 21 of the conventional example 2 of the abrasive sheet / sponge type is the first example roller 3
In the first and second example rollers 41, there is almost no difference in the initial removing ability, but when the same roller is used several times, the difference appears in the removing ability, and the roller of the conventional example 2 of the abrasive sheet / sponge type is more effective. Life will be faster.

This is because the roller 21 of the conventional example 2 of the abrasive sheet / sponge type does not transmit a sufficient driving force from the rotating drum similarly to the roller 15 of the conventional example 1 of the sponge type, so that the same portion of the roller 21 is used. This is considered to be due to clogging of the magnetic head, which occurs due to repeated contact with the magnetic head. Also, as described above, when the roller 21 comes into contact with the magnetic head, spacing occurs with respect to the magnetic head. This is considered to be due to a case where it becomes impossible to remove the attached matter at the spacing generating section. Actually, the roller 21 of Conventional Example 2 of the abrasive sheet / sponge type had irregular roller rotation.

On the other hand, the first example roller 31 and the second
As described above, the example roller 41 is stably rotated by the rotational driving force transmitted from the rotating drum reliably, and the abrasive sheet 32 comes into contact with the magnetic head in a wavy manner, so that not only the tape sliding surface, but also The surface deposits and the deeply deteriorated layer could be polished and removed by contacting the details of the upper and lower surfaces.

Here, there is no difference in the removal effect between the first example roller 31 in which only the abrasive sheet is laminated and the second example roller 41 in which the abrasive sheet and the non-abrasive sheet are alternately laminated. The abrasive sheet and the non-abrasive sheet of the roller 41 come into contact with the magnetic head almost alternately on the upper and lower surfaces by the rotation of the rotating drum and the roller, and the magnetic head is polished by the abrasive sheet on both the upper and lower surfaces. Therefore, if the polishing sheets are stacked alternately, there is almost no difference in the removal ability. By laminating the polishing sheets every other sheet in this manner, the number of times of polishing the magnetic head is halved, and unnecessary polishing of the magnetic head is prevented.

As described above, the head cleaning roller according to the present invention is formed by laminating abrasive sheets, and is formed so as to be polished while the magnetic head is sandwiched between the abrasive sheets. Experimentally, it was confirmed that the effect was about 10 times or more that of the head cleaning roller.

The head cleaning roller according to the present invention can also control the change in the shape of the tape sliding portion of the magnetic head due to the pressure contact of the roller, depending on the type of the abrasive sheet. It is possible.

The embodiment of the magnetic head cleaning apparatus according to the present invention has been described above. However, the present invention is not limited to this embodiment, and can be variously modified without departing from the spirit of the present invention. Things.

For example, the structures of the support mechanism for rotatably supporting the head cleaning roller and the drive mechanism for driving the support mechanism to move toward and away from the rotary head device are not limited to those shown in the drawings. Instead of being attached to the fixed drum of the rotating head device, it is arranged at a position distant from the rotating head drum device, and the head cleaning roller is configured to move toward and away from the peripheral surface of the rotating drum on which the magnetic head is mounted. You may.

The dimensions such as the height and diameter of the head cleaning roller can be set in accordance with the dimensions of the magnetic head of the rotary head device using the head cleaning roller and the rotary drum on which the magnetic head is mounted.

The head cleaning roller according to the present invention, which is formed by alternately laminating the abrasive sheet and the non-abrasive sheet, exposes the abrasive on one side and the other side with the abrasive-free side. A sheet, for example, a sheet in which an abrasive is applied and adhered to one surface of a nonwoven fabric is formed to have the same diameter as the roller diameter, and the sheet is oriented in the same direction in the roller axis direction, that is, the abrasive surface and the non-abrasive surface. Can be formed so as to face each other. The head cleaning roller thus formed has the same operation and effect as the above-described head cleaning roller formed by alternately laminating the abrasive sheet and the non-abrasive sheet.

[0049]

As described above, the magnetic head cleaning device according to the present invention performs cleaning by pressing against the peripheral surface of the rotary drum on which the magnetic head of the rotary head device is mounted and rolling contact with the protrusion of the magnetic head. By forming the head cleaning roller by laminating the polishing sheet in the axial direction of the roller core, the cleaning roller has the required rigidity in the outer peripheral surface in the circumferential direction, and the rotational force from the rotating drum is ensured. The magnetic sheet is always rotated stably and rolled so as to be sandwiched between the protrusions of the magnetic head, so that the polishing sheet contacts and polishes from the gap of the tape sliding surface of the magnetic head to the upper and lower surfaces. Cleaning is performed to remove deposits on the head surface, and this polishing can also remove fine layers and degraded layers that extend to deep layers. The effect is significantly improved.

Therefore, generation of a head clock of the magnetic head, clogging of the head gap, generation of a level drop, and the like can be almost completely prevented, and the recording and reproduction of the information signal can be always performed in a normal state, and the reliability is improved. Has the effect of improving

[Brief description of the drawings]

FIG. 1 shows a magnetic head cleaning device 1 according to the present invention.
It is a perspective view of an example.

FIG. 2 is a perspective view of a first example of a head cleaning roller provided in the magnetic head cleaning device shown in FIG.

FIG. 3 is an exploded perspective view of a part of the head cleaning roller shown in FIG.

4 is an enlarged cross-sectional view of a main part in a state where a magnetic head is cleaned by a head cleaning roller illustrated in FIG. 2;

FIG. 5 is a perspective view of a second example of a head cleaning roller provided in the magnetic head cleaning device according to the present invention.

FIG. 6 is an exploded perspective view of a part of the head cleaning roller shown in FIG.

FIG. 7 is a schematic plan view showing a relationship between a magnetic head cleaning device and a rotary head device.

FIG. 8 is a longitudinal sectional view showing a state in which a magnetic head is cleaned by a conventional example of a head cleaning roller.

FIG. 9 is a perspective view of a conventional magnetic head cleaning device.

FIG. 10 is a perspective view of another conventional head cleaning roller.

11 is an enlarged cross-sectional view illustrating a state in which the magnetic head is cleaned by the head cleaning roller illustrated in FIG. 10;

[Explanation of symbols]

1 magnetic head cleaning device, 2 rotating drums,
3,4 fixed drum, 5 rotating head device, H (H _1, H
₂ ) Magnetic head, 12 support arms, 14 axes, 31,
41 head cleaning roller, 32, 42 polishing sheet, 33, 44 roller core, 43 non-polishing sheet

Claims (6)

[Claims] 1. A magnetic head cleaning device wherein a magnetic head mounted on a rotating drum of an information signal recording / reproducing apparatus is cleaned by a head cleaning roller rotated while being pressed against the rotating drum. A magnetic head cleaning apparatus, wherein a polishing sheet is laminated in the axial direction of a roller core. 2. The magnetic head cleaning device according to claim 1, wherein the polishing sheet is a sheet impregnated with an abrasive. 3. The magnetic head cleaning device according to claim 1, wherein the polishing sheet is a sheet to which an abrasive is adhered. 4. The magnetic head cleaning device according to claim 1, wherein the head cleaning roller is formed by alternately stacking a polishing sheet and a sheet having no polishing effect in the axial direction of the roller core. apparatus. 5. The magnetic head cleaning device according to claim 4, wherein the sheet having no polishing effect is made of a nonwoven fabric. 6. The cleaning roller according to claim 1, wherein a polishing sheet having only one surface as a polishing surface is provided in the axial direction of the roller.
2. The magnetic head cleaning device according to claim 1, wherein the polished surface and the non-polished surface are formed in contact with each other and laminated.