JPH0433534Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides a rotating magnetic head device on a rotating drum, a rotating magnetic head of the rotating magnetic head device protruding from the outer peripheral surface of the rotating drum, A magnetic recording/reproducing apparatus is provided in a magnetic recording/reproducing apparatus which records or reproduces a video signal, etc. by bringing a magnetic tape wound around the outer circumferential surface of the tape and the rotating magnetic head into sliding contact with the rotating magnetic head. The present invention relates to a rotating magnetic head cleaning device for removing dirt such as magnetic powder adhering to the outer peripheral surface of a drum and preventing the accumulation of such dirt so as to always obtain good recording and reproducing conditions.

[Background technology and its problems]

Conventionally, as a magnetic recording/reproducing device, a rotating magnetic head device is provided on a rotating drum that rotates at high speed, and the rotating magnetic head of the rotating magnetic head device is made to protrude from the outer circumferential surface of the rotating drum, and is wound diagonally around the outer circumferential surface of the rotating drum. A system has been put into practical use in which high-frequency signals can be recorded or reproduced by bringing a running magnetic tape into sliding contact with the rotating magnetic head to form diagonal recording tracks on the magnetic tape. It is used as a video tape recorder, digital audio player, etc.

In such a magnetic recording/reproducing device, the lubricant, binder, magnetic powder, etc. of the magnetic tape seep out or are scraped off from the magnetic tape, thereby adhering to the rotating magnetic head as dirt and gradually accumulating. This causes clogging of the rotating magnetic head and a deterioration in sensitivity called the so-called running effect, thereby causing a phenomenon in which good recording or reproduction by the rotating magnetic head is hindered.
In particular, when a magnetic tape with a high packing density of magnetic powder or a so-called vapor tape coated with ferromagnetic metal is used to improve the recording density as described above, these tapes have poor wear resistance. Therefore, the above-mentioned phenomenon is becoming more and more noticeable.

Therefore, in such a magnetic recording/reproducing apparatus, in order to always obtain a good recording or reproducing state, it is necessary to clean the rotating magnetic head at least periodically. However, for example, it is not preferable to remove the outer case of the magnetic recording/reproducing apparatus and clean the rotating magnetic head because of safety concerns. Therefore, various types of rotating magnetic head cleaning devices have been proposed which are installed inside the magnetic recording/reproducing apparatus and are configured to automatically clean the rotating magnetic head. As such a rotating magnetic head cleaning device, one is known in which a rotatably provided cylindrical or cylindrical cleaning section is configured so as to be in sliding contact with the outer peripheral surface of the rotating magnetic head and the rotating drum. In this cleaning device, a cleaning material such as a nonwoven fabric is wrapped around the outer periphery of a core material rotatably provided with respect to a support member to form a cleaning section, and the cleaning section is intermittently connected to the rotating magnetic head and the rotating magnetic head. The cleaning section rotates when it comes into contact with the rotating magnetic head and the outer circumferential surface of the rotating drum, and when it comes into contact with the rotating magnetic head and the outer circumferential surface of the rotating drum, the cleaning section rotates, The durability and cleaning effect of this cleaning section are improved by alleviating the impact and cleaning the rotating magnetic head using substantially the entire circumference of this cleaning section.

However, when the above-described cylindrical or cylindrical cleaning section is formed by wrapping a cleaning material around the core material, the outer peripheral surface of the cleaning section is stepped by the end of the cleaning material. For example, the rotary magnetic head engages with this stepped portion, and the sliding contact between the cleaning portion and the rotary magnetic head is disturbed, making it impossible to perform stable cleaning of the rotary magnetic head. Furthermore, there is a risk that the rotating magnetic head and cleaning section may be damaged. In addition, the adhesive used to fix the ends of the cleaning material makes a part of the cleaning part hard, making it impossible to achieve smooth sliding contact between the cleaning material and the rotating magnetic head. The effectiveness is also reduced by half, and there is a risk that the rotating magnetic head may be damaged.

Therefore, instead of forming the cleaning part by wrapping the cleaning material around the core material, for example, if the cleaning material made of synthetic resin foam is punched out into a cylindrical shape and the cleaning part is formed, the step part as described above can be formed. It is possible to form an outer circumferential surface with no

However, when a flexible cleaning material such as the above-mentioned foam is punched out, the pressure during punching causes the cleaning material to bend, for example, the outer peripheral surface is curved in the radial direction, and the entire surface is eccentric. A state cleaning section will be formed. Therefore, when such a cleaning part is butted against the rotating magnetic head and rotating drum, the eccentric cleaning part does not rotate freely and proper sliding contact cannot be obtained, making stable cleaning difficult. The disadvantage is that it cannot be done.

[Purpose of invention]

Therefore, in view of the above-mentioned circumstances, the present invention allows the cleaning part to be formed into an accurate cylindrical or cylindrical shape, and makes the outer circumferential surface of the cleaning part an appropriate cleaning surface, which provides good protection against the rotating magnetic head. It is an object of the present invention to provide a rotating magnetic head cleaning device that can exhibit excellent cleaning effects.

[Means to achieve the purpose]

In order to achieve the above-mentioned purpose, the rotating magnetic head cleaning device according to the present invention has a large number of approximately disk-shaped cleaning materials stacked coaxially, and these cleaning materials are axially stacked by a fixing member. a cleaning section formed by crimping and clamping; a support member supporting the cleaning section rotatably in a direction parallel to the rotation axis of a rotating drum to which a rotating magnetic head is attached; a moving mechanism for moving the support member toward and away from the outer peripheral surface of the drum and a rotating magnetic head protruding from the outer peripheral surface; The outer circumferential surface of the rotary drum and the rotating magnetic head are cleaned by contacting the outer circumferential surface of the rotating drum and the rotating magnetic head protruding from the outer circumferential surface.

[Embodiments] Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings.

In this embodiment, a magnetic recording and reproducing apparatus equipped with a rotating magnetic head cleaning device according to the present invention includes a fixed drum 2 erected on a mechanical chassis 1 and a fixed drum 2, as shown in FIGS. The rotary drum 3 is disposed coaxially with the rotary drum 2 and rotated at high speed by a drive motor (not shown) or the like. The rotating drum 3 supports a plurality of rotating magnetic heads 4, 4, and the rotating magnetic head 4 is mounted on a printed circuit board (not shown) in the rotating drum 3. A head device is provided.
The rotating magnetic head 4 protrudes from the outer circumferential surface of the rotating drum 3 through a window provided at the side edge of the outer circumferential portion of the rotating drum 3 facing the fixed drum 2. A magnetic tape 5 is attached to the outer circumferential surface of the rotating drum 3 and the outer circumferential surface of the fixed drum 2.
The magnetic tape 5 is wound diagonally and runs, and the rotating magnetic head 4 comes into sliding contact with the magnetic tape 5 to form a diagonal recording track on the magnetic tape 5, thereby recording information such as video signals. It is designed to record or reproduce signals.

The rotary magnetic head cleaning device according to the present invention is a rotary drum 3 and a fixed drum 2.
The rotary magnetic head cleaning device is disposed near the side where the magnetic tape 5 is not wound.
A cleaning unit moving mechanism is provided on the support base 6, and the cleaning unit 7 is moved by the cleaning unit moving mechanism so as to be pressed against the outer circumferential surface of the rotating drum 3.

The cleaning unit moving mechanism has a holding plate 8 screwed and fixed on the support base 6,
A rotating arm 9 supporting the cleaning section 7 is provided on the holding plate 8, and a solenoid plunger 1 for rotating the rotating arm 9.
0, a compression spring 11, a return spring 12, and a compression lever 13 are arranged. That is, the rotating arm 9 is formed into a substantially L-shape, and the cleaning section 7 is attached to one end of the L-shape via a mounting shaft 14, and the bent portion of the L-shape is attached to the support shaft 1.
5, and the other end of the L-shape is provided at the other end of the crimp lever 13.
6, and the rotating position of this rotating arm 9 is regulated. Further, the crimp lever 13 has one end rotatably supported on a common shaft 15 with the pivot arm 9, and is rotatably supported by the engagement pin 1 as described above.
The other end of the rotary arm 9, which regulates the rotational position via the solenoid plunger 6, is engaged with the tip of the plunger rod 10a of the solenoid plunger 10 via the engagement pin 15. Further, the compression spring 11 is arranged between the rotation arm 9 and the compression lever 13,
A cleaning section 7 disposed at one end of the rotating arm 9 is biased to rotate in a direction to press the rotating arm 9 against the outer circumferential surface of the rotating drum 3. The return spring 12 is disposed between the crimp lever 13 and the holding plate 8, and the plunger rod 10a, which engages the crimp lever 13 with its other end, is connected to the solenoid box 10.
It is rotationally biased in the direction to be pulled out from b.

In the cleaning section moving mechanism having such a structure, when the solenoid plunger 10 is energized and the plunger rod 10a is pulled toward the solenoid box 10b as shown in FIG. The lever 13 is rotated against the urging force of the return spring 12. In this state, the cleaning section 7 attached to the rotating arm 9 is brought into pressure contact with the rotary drum 3 by the urging force of the compression spring 11.

Further, when the energization to the solenoid plunger 10 is stopped, the crimp lever 13 is pressed against the plunger rod 1 by the biasing force of the return spring 12.
0a rotates in the direction in which it is pulled out from the solenoid box 10b. Therefore, the crimp lever 1
The rotating arm 9 whose rotational position is regulated by the regulating pin 16 of No. 3 rotates with the crimp lever 13, and as shown in FIG.
is separated from the rotating drum 3 and the rotating magnetic head 4.

In this manner, the cleaning section moving mechanism intermittently moves the cleaning section 7 by switching and controlling the energization state to the solenoid plunger 10, and the cleaning section 7 moves the rotating magnetic head 4 and the The rotary drum 3 is driven to periodically clean the outer circumferential surface of the rotary drum 3.

Further, the cleaning section 7 is rotatably attached to the support member 17 by providing a support member 17 at the tip of the attachment member 14 which is provided so as to hang down from one end of the rotation arm 9 mentioned above. As shown in FIG. 4, the cleaning section 7 is constructed by fixing members 20 and 21 in the axial direction by stacking a large number of cleaning materials 19, which are formed in a disk shape and have an insertion hole 18 in the center, in a coaxial manner. It is formed by crimping and clamping. Each of the above cleaning materials 19
For example, the nonwoven fabric formed in the shape of a thin strip is punched into a disc shape having the above-mentioned insertion hole 18, and has a uniform shape. Further, the fixing members 20 and 21 are
For example, as shown in FIG.
is a substantially rivet-shaped member with a threaded portion 22a formed at the tip of the shaft portion 22, and the other fixing member 21
is formed into a nut shape to be screwed into the threaded portion 22a of one of the fixing members 20. The shaft portion 22 of one of the fixing members 20 is inserted into an insertion hole 18 formed in the cleaning material 19. At both ends of the fixed member 20 in the axial direction, there are pivots 20 for rotatably attaching the cleaning section 7 to the supporting member 17.
a, 20a protrude in the axial direction.

Each of the cleaning materials 19 is stacked as described above, and one of the fixing members 20 is inserted into the insertion hole 1.
8 and screwing the fixing members 20 and 21 together, the head 2 of one of the fixing members 20
3 and the other fixing member 21,
An integrated cleaning section 7 is formed. In the cleaning section 7 thus formed, the outer peripheral edges of the cleaning materials 19 stacked coaxially overlap uniformly, forming an accurate cylindrical shape as a whole, and the outer peripheral surface has small irregularities and uniform hardness. It is formed as a clean cleaning surface. Note that if the axes of the cleaning materials 19 are not aligned uniformly, the fixing members 2
By slightly loosening the constriction of each cleaning material 19 by 0 and 21 and rolling this cleaning part 7 on a flat surface, the outer circumferential surface with small irregularities can be easily obtained.

Further, as shown in FIG. 6, for example, the support member 17 to which the cleaning section 7 is attached has a pivot 20 of the fixing member 20 at both ends of a connecting section 24 having a length corresponding to one of the fixing members 20.
A pair of supporting pieces 25, 25 that fit into the connecting portions 20a, 20a are substantially U-shaped and extend perpendicularly to the connecting portion 24. That is, the pivot 20 is provided on the opposing surfaces of the pair of support pieces 25, 25.
recesses 17a, 1 into which the parts a, 20a are rotatably fitted;
7a is formed, and these support pieces 25, 25
The cleaning portion 7 can be fitted into the cleaning portion 7 by elastically expanding the cleaning portions 7 to each other.

In this way, the cleaning section 7 rotatably attached to the support member 17 is intermittently moved by the drive of the cleaning section moving mechanism, and the cleaning surface formed by each of the cleaning materials 19 is cleaned. It comes into contact with the outer peripheral surfaces of the rotating magnetic head 4 and the rotating drum 3 which are in a rotationally driven state.
At the time of this contact, the cleaning section 7 freely rotates under the rotational force of the rotating drum 3, reducing the impact generated between the cleaning surface and the rotating magnetic head 4, and as described above, the cleaning section 7 has small irregularities. The cleaning surface with uniform hardness properly wipes away dirt adhering to the outer peripheral surfaces of the rotating magnetic head 4 and the rotating drum 3, thereby preventing deterioration of the recording or reproducing condition of the magnetic tape 5 by the rotating magnetic head 4. do.

Note that the present invention is not limited to the above-described embodiments, and can be modified in various ways. For example, as shown in FIG. 7, a cleaning material 26 may be provided with regular cuts 26a formed on the outer periphery. Cleaning portion 7 formed with this cleaning material 26
The cleaning surface is highly flexible and exhibits a good cleaning effect.

Alternatively, two or more types of cleaning materials having different diameters may be provided and these cleaning materials may be stacked alternately to form the cleaning portion 7 having a highly flexible cleaning surface.

Furthermore, the cleaning material 19 may be formed into a polygonal shape with obtuse angle corners.

Further, as shown in FIG. 8, a substantially cylindrical fixing member 28 is provided which is rotatably attached to the support member 17 via bearings 27, 27, and an insertion hole 18 into which the fixing member 28 is inserted is provided.
A large number of disk-shaped cleaning materials 19 are provided, and these cleaning materials 19 are attached to a flange portion 29 formed at one end of the one fixing member 28 and a threaded portion 28a formed at the other end of the fixing member 28.
A clamping cleaning portion 7 may be formed between the fixing member 30 and the other fixing member 30 that is screwed together. If formed in this way, the cleaning section 7 can be freely rotated, and more stable cleaning can be performed. Furthermore, fixing members 20 and 2 that are screwed together and clamp each of the cleaning materials 19 are also provided.
1, 28, and 30 may be replaced by fixing members that are bonded to each other with an adhesive and hold each of the cleaning materials 19 in a crimp state.

Since such a fixing member does not require a threaded portion, it can be applied even when forming an extremely small cleaning section 7.

Further, as the cleaning member moving mechanism, a mechanism using a motor or the like as a driving source may be provided, and a mechanism configured to gradually displace the cleaning section 7 in its axial direction may be provided.

[Effect of idea]

As is clear from the description of the embodiments described above, according to the present invention, a cleaning section is formed by coaxially holding a large number of disk-shaped cleaning materials by a fixing member. An accurate cylindrical or cylindrical shape with no eccentricity can be easily obtained, and the outer circumferential surface can be formed as a cleaning surface with uniform hardness without steps or the like. Therefore, stable cleaning can be performed without damaging the rotating magnetic head.

[Brief explanation of the drawing]

FIG. 1 is a schematic plan view showing one embodiment of the present invention, FIG. 2 is a schematic side view thereof, and FIG. 3 is a schematic plan view showing another operating state of the above embodiment. FIG. 4 is an exploded perspective view showing the cleaning section, FIG. 5 is a side view showing the fixing member, and FIG. 6 is a side view showing the cleaning section attached to the support member. FIG. 7 is a plan view showing another example of the cleaning material;
The figure is a schematic sectional view showing another embodiment of the present invention. 4... Rotating magnetic head, 7... Cleaning section, 17... Supporting member, 19, 26... Cleaning material, 20, 21, 28, 30... Fixing member.

Claims (1)

[Scope of Claim for Utility Model Registration] A cleaning section formed by coaxially stacking a large number of cleaning materials formed in a substantially disk shape and pressing and clamping these cleaning materials in the axial direction by a fixing member; a supporting member that allows the cleaning section to rotate in an axial direction parallel to the rotation axis of the rotating drum to which the rotating magnetic head is attached; A rotating magnetic head cleaning device comprising: a moving mechanism for moving the supporting member toward and away from the head.