JP2910189B2 - Rotary head cleaning mechanism for magnetic recording / reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention is directed to automatically cleaning the rotary head in a VTR or the like using the rotary head in order to always obtain a good recording and reproducing state. The present invention relates to a rotating head cleaning mechanism of a magnetic recording and reproducing apparatus.

SUMMARY OF THE INVENTION According to the present invention, there is provided a rotation of a magnetic recording / reproducing apparatus in which a rotary head is rotatably provided at a projecting position on an outer peripheral surface of a drum, and a cleaning member is brought into contact with the rotary head to clean the rotary head. In a head cleaning mechanism, an arm member swingably supported at a position near the drum, a cleaning member rotatably supported in one direction via a one-way clutch on a distal end side of the arm member, and the arm An actuator connected to the base side of the member and swinging the arm member to rotate the cleaning member in one direction when the cleaning member comes into contact with the outer peripheral surface of the drum; Before cleaning (before the rotating head contacts the cleaning member), slightly rotate the cleaning member in one direction. It is allowed to be able to advance displace the head contact position of the cleaning member, in which and which make it possible to give freedom to the installation site.

Further, according to the rotary head cleaning mechanism of the magnetic reproducing apparatus of the present invention, the arm member is constituted by the first arm member and the second arm member, and the first arm member and the second arm member are provided. Is swung in the same direction until the cleaning member contacts the outer peripheral surface of the drum, and is swung in the opposite direction after the contact, so that the cleaning member can be slightly moved in one direction before cleaning. By rotating the cleaning member, the head contact position of the cleaning member can be more reliably displaced, and the cleaning effect can be further enhanced by changing the head contact position of the cleaning member for each cleaning.

[Prior art] The rotating head of a VTR (video tape recorder) as a magnetic recording / reproducing device scans a magnetic tape at high speed.
The magnetic powder of the magnetic tape easily adheres, and dirt other than the magnetic powder easily adheres. If the magnetic powder or the like adheres to the rotating head, there is a possibility that recording and reproduction may be hindered. For this reason, a rotary head cleaning mechanism that automatically cleans the rotary head without requiring a user to perform a special operation for cleaning the head is disclosed in, for example, Japanese Utility Model Laid-Open No. 60-14014.
No. 6,086,045. This will be described in detail with reference to FIGS. 6 to 8. Referring to FIG.
It is a loading type VTR (Video Tape Recorder), and has a rotating head 42 that protrudes from the center of the outer peripheral surface of the drum 41 and rotates. Reference numeral 50 denotes a rotary head cleaning mechanism, and each tape guide 43, 4 for tape loading at a position where the magnetic tape 46 stored in the tape cassette 45 near the outer peripheral surface of the drum 41 is not wound.
It is provided between four. As shown in FIGS. 7 and 8, the rotary head cleaning mechanism 50 includes a slide plate 54 sliding on a support plate 53 fixed on a support member 52 erected on a chassis 51, and a support plate A compression coil spring 55 interposed between the slide plate 53 and the slide plate 54 for urging the slide plate 54 in a direction approaching the outer peripheral surface side of the drum 41, and a solenoid plunger for moving the slide plate 54 in a direction away from the drum 41 56, an externally threaded spindle 57 fixed and suspended at the lower end of the tip of the slide plate 54, and a cylindrical moving member 58 screwed to the spindle 57 and having an upper half large diameter portion as a worm wheel portion 58a. The lower half small diameter portion 58 of the moving member 58
A cleaning member formed into a cylindrical shape by winding non-woven fabric or the like rotatably supported on bearing b through bearings 59 in a plurality of layers.
A worm gear 61 rotatably mounted below the slide plate 54 and meshing with the worm wheel portion 58a;
And a ratchet mechanism 62 comprising a ratchet pulley 63, a ratchet pawl 64, and a tension coil spring 65 for rotating the worm gear 61 in one direction when the slide plate 54 approaches the outer peripheral surface of the drum 41.

The rotating head cleaning mechanism 50
When removing foreign matter such as magnetic powder adhered to the tip of the rotary head 42 of 41, the solenoid plunger 56 is driven from the state shown in FIG. 7 to lock the locking portion 56a of the solenoid plunger 56 and the slide plate 54. When the locked state with the locking piece 54a is released, the slide plate 54 moves to the outer peripheral surface side of the drum 41 by the compression force of the compression coil spring 55 as shown in FIG. With the movement of the slide plate 54, the cleaning member 60 comes into contact with the outer peripheral surface of the drum 41 and the rotating head
Rotate while pressing against 42. Thereby, the deposits such as the magnetic powder attached to the rotary head 42 are cleaned. As the cleaning member 60 rotates during this cleaning, the head contact position of the cleaning member 60 with the rotary head 42 is displaced in the direction around the axis of the cleaning member 60 each time the cleaning member 60 comes into contact with the rotating head 42. Further, with the movement of the slide plate 54, the cleaning member 60 gradually moves downward through the ratchet mechanism 62 and the like. Then, each time the cleaning is repeated, the cleaning member 60 is gradually displaced also in the axial direction, and the head contact position with the rotary head 42 is gradually displaced.

[Problems to be Solved by the Invention] However, the conventional rotary head cleaning mechanism 50
In this case, unless the cleaning member 60 is in contact with the rotary head 42 during cleaning, the head contact position of the cleaning member 60 cannot be displaced in the direction around the axis,
Further, in order to displace the cleaning member 60 in the axial direction, the ratchet mechanism 62 and the like are required, and there is a disadvantage that the structure becomes complicated. Further, the installation location of the rotary head cleaning mechanism 50 is also limited to a narrow portion where the magnetic tape 45 of the drum 41 is not wound, and there is a disadvantage that the installation is restricted.

Accordingly, the present invention provides a rotary head cleaning mechanism of a recording / reproducing apparatus which can displace a head contact position of a cleaning member before cleaning and can freely determine an installation location. .

[Means for Solving the Problems] Rotation of a magnetic recording / reproducing apparatus in which a rotary head is rotatably provided at a projecting position on an outer peripheral surface of a drum and a cleaning member is brought into contact with the rotary head to clean the rotary head. In the head cleaning mechanism, an arm member swingably supported at a position near the drum,
A cleaning member rotatably supported in one direction via a one-way clutch at a distal end side of the arm member;
An actuator connected to the base side of the arm member, and swinging the arm member to rotate the cleaning member in one direction when the cleaning member comes into contact with the outer peripheral surface of the drum.

According to a second aspect of the present invention, there is provided a rotary head cleaning mechanism for a magnetic recording / reproducing apparatus, wherein a first arm member swingably supported at a position near a drum and a tip end side of the first arm member swing. A second arm member freely supported,
A cleaning member rotatably supported in one direction via a one-way clutch at a distal end side of the second arm member, and a cleaning member connected to a base side of the first arm member; The arm member 2 is swung in the same direction until the cleaning member contacts the outer peripheral surface of the drum, and is swung in the opposite direction after the contact, so that the cleaning member contacts the outer peripheral surface of the drum. An actuator that sometimes rotates the cleaning member in one direction, and an elastic member that is interposed between the first arm member and the second arm member and urges the cleaning member in a direction that contacts the outer peripheral surface of the drum. It has.

[Operation] An arm member which swingably supports a rotary head cleaning mechanism at a position near the drum, and a cleaning member which is rotatably supported in one direction via a one-way clutch at a distal end side of the arm member. And an actuator that is connected to the base side of the arm member and swings the arm member to rotate the cleaning member in one direction when the cleaning member comes into contact with the outer peripheral surface of the drum. Then, the cleaning member is slightly rotated in one direction so that the head contact position of the cleaning member is displaced before coming into contact with the rotary head, and the head contact position of the cleaning member is changed for each cleaning, thereby improving the cleaning effect.

Further, the arm member is constituted by a first arm member and a second arm member, and the first arm member and the second arm member are connected until the cleaning member comes into contact with the outer peripheral surface of the drum. The cleaning member is swung in the same direction, and after contact, is swung in the opposite direction.Before cleaning, the cleaning member is surely slightly rotated in one direction and the head contact position of the cleaning member is surely displaced. In addition, the head contact position of the cleaning member changes for each cleaning, and the cleaning effect is further improved.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

1 and 2, reference numeral 1 denotes a U-loading type VTR (magnetic recording / reproducing apparatus), and a so-called propeller rotating drum 3 is mounted on the chassis 2 at an angle. The drum 3 includes a fixed upper drum 3a and a fixed lower drum 3a.
3b. A gap is formed between the fixed upper drum 3a and the fixed lower drum 3b, and a rotating head 4 that rotates so as to protrude from the outer peripheral surface 3c of the drum 3 is provided at the gap position. As shown in an output waveform diagram of FIG. 5, the rotary head 4 is configured to rotate for a predetermined time when a tape cassette is mounted (cassette down) in addition to a time of a tape loading or a reproduction mode. I have.
A guide rail 5 for moving a tape guide (both not shown) for loading a magnetic tape from inside the tape cassette is arranged on the outer peripheral side of the drum 3 on the chassis 2.

In the vicinity of the outer peripheral surface 3c of the drum 3 on the chassis 2,
A rotary head cleaning mechanism 10 is provided. The rotating head cleaning mechanism 10 includes a base plate fixed on the chassis 2 so as to be aligned with the guide rail 5.
A first arm member having a base end 13a rotatably supported on the support shaft 12 so as to swing clockwise and counterclockwise about a support shaft 12 erected on the base plate 11; 13
A base 14a is pivotally supported on the support shaft 15 so as to swing clockwise and counterclockwise about a support shaft 15 erected on the distal end portion 13b of the first arm member 13. The cleaning is rotatably supported in one direction (the direction of arrow C in FIG. 3) via a compression coil spring 16 constituting a one-way clutch on the second arm member 14 and a distal end portion 14b side of the second arm member 14. The member 17 and the base of the first arm member 13
13c, the first arm member 13 and the second arm member 14 are moved in the same direction until the cleaning member 17 contacts the outer peripheral surface 3c of the drum 3 (the clock indicated by the arrow A in FIG. 3). After the contact, the cleaning member 17 is swung in opposite directions (the direction of arrow A and the direction of arrow B in FIG. 3) so that the cleaning member 17 is moved to the outer circumferential surface 3c of the drum 3.
A solenoid plunger (actuator) 18 for slightly rotating the cleaning member 17 in one direction (in the direction of arrow C in FIG. 3), an upright portion 13d in the first arm member 13 and a second arm A first locking portion interposed between the rising portions 14d of the base end portion 14c of the member 14 and the base end portion 14c of the second arm member 14 standing outside the distal end on the first arm member 13;
A tension coil spring (elastic member) 19 for urging in a direction abutting on 13e (a direction in which the second arm member 14 swings clockwise) is roughly constituted.

The base plate 11 is formed of a metal plate having a substantially T-shape in plan view, and is fixed on the chassis 2 by a predetermined means such as a screw near the drum 3 so as to sandwich a substantially central portion of the guide rail 5. The solenoid plunger 18 is fixed on the base plate 11 via a pair of screws 20, 20. Further, a locking piece 11a is formed by projecting upward at the tip end side of the base plate 11. By locking the locking piece 11a with a locking portion 13g integrally projecting from the lower surface of the base portion 13c of the first arm member 13, the first arm member 13 is moved to the first position.
The swing range of the arm member 13 in the counterclockwise direction is restricted to a certain range.

The first and second arm members 13, 14 are formed of synthetic resin, respectively. In the base 13c of the first arm member 13, a recessed locking portion 13c 'is integrally formed.
A locking portion 18b at the tip of the plunger 18a of the solenoid plunger 18 is loosely fitted to the locking portion 13c '. A compression coil spring 21 is interposed in the plunger 18a, and no voltage is applied to the solenoid of the solenoid plunger 18 due to the compression force of the compression coil spring 21. At the same time, the locking portion 13g of the first arm member 13 The first arm member 1 until it hits the locking piece 11a
3 swings counterclockwise. A second locking portion 13f is integrally formed on the inside of the tip of the first arm member 13 so as to protrude. The second lock 13f and the first lock 1
The base end 14c of the second arm member 14 swings between 3e. The first and second arm members 13, 1
Reference numeral 4 is retained by washers 22, 23 locked to the tips of the spindles 12, 15.

Further, a cylindrical portion is provided on the distal end side of the lower surface of the second arm member 14.
14e is integrally formed by hanging, and a shaft 24 is press-fitted into the cylindrical portion 14e. The cleaning member 17 is rotatably supported on the shaft 24 via a washer 25. The cleaning member 17 is rotatably supported by the shaft 24 and has a synthetic resin roller 26 having an annular concave groove 26a extending from the upper surface to an intermediate portion, and a urethane material fitted to the outer peripheral surface of the roller 26. And a cleaning material 27 made of a sponge. The compression coil spring 1 is mounted on the groove 26a of the roller 26 and the outer peripheral surface of the cylindrical portion 14e of the second arm member 14.
6 is interposed. The compression coil spring 16 is inserted into the groove 26a of the roller 26 while turning it counterclockwise, and one end of the compression coil spring 16 is positioned at a predetermined position of the groove 26a of the roller 26.
By locking the other end to a predetermined position on the outer peripheral surface of the cylindrical portion 14e, it functions as a one-way clutch. Thereby, the cleaning member 17
Rotates only in one direction clockwise before cleaning.

According to the rotary head cleaning function 10 of the VTR of the embodiment described above, when no voltage is applied to the solenoid of the solenoid plunger 18, the first arm member 13 and the second arm member 14 are represented by solid lines shown in FIG. It is in the state of. When the tape cassette is mounted at a predetermined position of the VTR 1 from this state, a voltage is applied to the solenoid of the solenoid plunger 18. As a result, the plunger 18a of the solenoid plunger 18 retreats against the compression force of the compression coil spring 21, and the first arm member 13 and the second arm member 14 move as shown in FIG.
As shown by the dashed line, they both swing in the same clockwise direction (the direction of arrow A shown in FIG. 3), and the cleaning member 17 provided on the distal end side of the second arm member 14 Abuts surface 3c.

From this state, the voltage is further applied to the solenoid of the solenoid ranger 18, and the first arm member 13 is moved clockwise (the direction of arrow A shown in FIG. 3) as shown by the two-dot chain line in FIG. While swinging, the second arm member 13 is
Swinging in the counterclockwise direction (the direction of arrow B shown in FIG. 3). At this time, the cleaning member 17 abuts along the outer peripheral surface 3c of the drum 3 and slightly rotates clockwise (the direction of arrow C shown in FIG. 3). Immediately after the cleaning member 17 slightly rotates, the rotary head 4 rotates counterclockwise around the outer peripheral surface of the drum 3. As a result, the rotating head 4 comes into contact with the cleaning member 17 several times, and the attached matter such as the magnetic powder adhered to the rotating head 4 is removed and cleaned by the cleaning member 17.
When the rotary head 4 rotates, the cleaning member 17
Does not rotate, but since the cleaning member 17 has an outer layer made of urethane sponge or the like, the impact when the rotating head 4 comes into contact with the cleaning member 17 is reduced, and the magnetic powder or the like adhered to the rotating head 4 is attached. Make sure to remove the kimono and clean it.

Thus, before the cleaning, that is, the rotating head 4
Before the cleaning member 17 rotates, the cleaning member 17 comes into contact with the outer peripheral surface 3c of the drum 3 and slightly rotates.
Each time the cleaning member 17 contacts the rotary head 4,
Can be displaced. Accordingly, the head contact position of the cleaning member 17 can be constantly changed every time the rotary head 4 is cleaned, and the attached matter such as the magnetic powder adhered to the rotary head 4 can be reliably cleaned. Therefore, the cleaning effect can be further enhanced, and no trouble occurs during recording and reproduction of the VTR 1.

In addition, during tape loading, recording, and reproduction of the VTR 1, no voltage is applied to the solenoid of the solenoid plunger 18. Back to
It does not hinder tape loading. Therefore, the installation location of the rotary head cleaning mechanism 10 on the VTR 1 can be determined relatively freely, and is not limited to a narrow portion where the magnetic tape of the drum cannot be wound as in the related art.

Further, the rotary head cleaning mechanism 10 includes a first arm member 13, a second arm member 14, a solenoid plunger.
18 and the like, the number of parts can be reduced as compared with the conventional one, and the structure can be simplified and the manufacturing cost can be reduced.

According to the embodiment, the one-way clutch is constituted by the compression coil spring, but may be constituted by a member other than the compression coil spring. Further, although the solenoid plunger is used as the actuator, it is not limited to this. Further, the cleaning material of the cleaning member is not limited to a urethane sponge, but may be any material having a good absorbency such as a nonwoven fabric.

[Effects of the Invention] As described above, according to the present invention, the rotary head cleaning mechanism of the magnetic recording / reproducing apparatus is provided with an arm member swingably supported at a position near the drum, and a tip end side of the arm member. A cleaning member rotatably supported in one direction via a one-way clutch, and connected to the base side of the arm member, when the arm member swings and the cleaning member comes into contact with the outer peripheral surface of the drum. Since the cleaning member is constituted by an actuator for rotating the cleaning member in one direction, the cleaning member can be slightly rotated in one direction before cleaning to displace the head contact position of the cleaning member before cleaning with a simple structure. In addition, the location of the rotary head cleaning mechanism can be freely set.

Further, the arm member is constituted by a first arm member and a second arm member, and the first arm member and the second arm member are connected until the cleaning member comes into contact with the outer peripheral surface of the drum. It is configured to swing in the same direction and swing in the opposite direction after contact, so that the cleaning member can be surely slightly rotated in one direction, and the head contact position of the cleaning member can be changed before cleaning. It can be displaced reliably. This makes it possible to further improve the cleaning effect by changing the head contact position of the cleaning member for each cleaning.

[Brief description of the drawings]

FIG. 1 is a schematic plan view of a VTR showing one embodiment of the present invention,
FIG. 2 is a schematic side view, FIG. 3 is a plan view of the rotary head cleaning mechanism of the VTR, FIG. 4 is a side view of the rotary head cleaning mechanism, and FIG. FIG. 6 is a schematic plan view of a conventional VTR, FIG. 7 is an explanatory view showing a state before cleaning of a conventional VTR, and FIG. 8 is an explanatory view showing a cleaning state of a conventional VTR. FIG. 1 VTR (magnetic recording / reproducing device) 3 Drum 3c
... Outer peripheral surface, 4... Rotating head, 10... Rotating head cleaning mechanism, 13... First arm member, 13 b, Tip portion, 13 c, Base portion, 14, 2nd arm member, 14 b. Tip, 16 ... Coil spring (one-way clutch), 17 ...
... cleaning member, 18 ... solenoid plunger (actuator), 19 ... tension coil spring (elastic member).

Claims (2)

(57) [Claims] A rotary head cleaning mechanism for a magnetic recording and reproducing apparatus, wherein a rotary head is rotatably provided at a projecting position on an outer peripheral surface of a drum and a cleaning member is brought into contact with the rotary head to clean the rotary head. An arm member swingably supported at a position near the drum; a cleaning member rotatably supported in one direction via a one-way clutch at a distal end side of the arm member; and a base side of the arm member And an actuator for swinging the arm member to rotate the cleaning member in one direction when the cleaning member comes into contact with the outer peripheral surface of the drum. Head cleaning mechanism. 2. A rotary head cleaning mechanism of a magnetic recording / reproducing apparatus wherein a rotary head is rotatably provided at a protruding position on an outer peripheral surface of a drum and a cleaning member is brought into contact with the rotary head to clean the rotary head. A first arm member swingably supported at a position near the drum, a second arm member swingably supported at a tip end side of the first arm member, and a second arm member; A cleaning member rotatably supported in one direction via a one-way clutch at a distal end side of the arm member; and a first arm member and a second arm member connected to a base side of the first arm member. Are swung in the same direction until the cleaning member contacts the outer peripheral surface of the drum, and are swung in the opposite direction after the contact, so that the cleaning member An actuator for rotating the cleaning member in one direction when the cleaning member comes into contact with the outer peripheral surface of the drum; and an actuator interposed between the first arm member and the second arm member to contact the cleaning member with the outer peripheral surface of the drum. A rotating head cleaning mechanism for a magnetic recording / reproducing apparatus, comprising: an elastic member for biasing.