JPH01317218A - Head cleaning device - Google Patents

Abstract

PURPOSE:To reduce the secular change of the contact force and the contact angle of a soft material to a rotary head by using a mobile member fixed onto a loading ring to attach and detach the soft material to and from a rotary head device. CONSTITUTION:A 1st or 2nd mobile member 30 or 31 acts on a support member 25 with the movement of a loading ring 17 which is set rotatably and coaxially to a rotary head. In such a case, however, the member 25 is energized by an energizing means 28 and a soft material 22 touches with pressure a rotary head device 1 during a loading or unloading action. Then the member 25 moves against the force of the means 28 via the member 30 at the end of a loading action and via a member 31 at the end of an unloading action respectively. Thus the material 22 is detached from the device 1. As a result, the change of the contact pressure and the contact angle of the member 22 is prevented to the rotary head and the cleaning effect is maintained.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a rotary head device for a magnetic recording and reproducing device.
In particular, the present invention relates to a head cleaning device that cleans a magnetic head by bringing a soft material into contact with the magnetic head.

[Conventional technology]

In a magnetic recording/reproducing device, a magnetic head that rotates together with an upper cylinder of a rotary head device protrudes from between the upper cylinder and a fixed lower cylinder, and travels in contact with the outer peripheral surfaces of the upper and lower cylinders. Since the magnetic tape is scanned by contacting the magnetic tape, magnetic powder from the magnetic tape adheres to the tip of the magnetic head. Furthermore, dust and the like may also adhere to the tip of the magnetic head. in this way,
If magnetic powder or dust adheres to the tip of the magnetic head,
If the contact between the magnetic head and the magnetic tape is poor, good recording and reproduction will not be possible, and the running of the magnetic tape will be disturbed, causing wow and flutter.

For this reason, it is necessary to clean the magnetic head.

Conventionally, as an example of a magnetic head cleaning device, there is a device that uses a guide base to pull out a magnetic tape from a cassette during a loading operation, and cleans the magnetic head just before the end of the loading operation and immediately after the start of the unloading operation. It has been proposed (Japanese Unexamined Patent Publication No. 62-22222). This head cleaning device includes a rotating member made of an elastic body such as a metal spring,
A roller-shaped soft material made of felt or the like rotatably attached to one end of the rotating member, a spring that biases the rotating member in a direction in which the soft material is separated from the rotating head device, and the rotating member It consists of a protrusion that can come into contact with.

During the loading operation, the guide base moves to wind the magnetic tape around the rotary head device, but just before the loading operation is completed when winding of the magnetic tape ends, the guide base presses the other end of the rotating member. As a result, the rotating member rotates against the biasing force of the spring, and the soft member comes into pressure contact with the rotating head device. At this time, the magnetic head is rotating, so cleaning of the magnetic head is performed. When the guide base moves further and enters the loading state, the guide base further pushes the other end of the rotating member, but as the rotating member rotates due to this, the protrusion comes into contact with the rotating member, This will push a portion of the rotating member in the opposite direction. For this reason, the rotating member is in a twisted state, and the soft material is tilted and separated from the rotating head device.

During the unloading operation, an operation opposite to the above is performed, and immediately after the start of the unloading operation, the soft material comes into contact with the rotary head device to clean the magnetic head.

[Problem to be solved by the invention]

By the way, in the conventional head cleaning device described above, the rotating member is held in a twisted state in the loading state. Moreover, since the rotating member is twisted every time loading is performed, permanent deformation is likely to occur in the rotating member. If permanent deformation occurs in the rotating member, the contact pressure and contact angle of the soft material against the rotating head will change, reducing the effectiveness of head cleaning. There was a problem in that the magnetic head no longer came into contact with the magnetic head, and head cleaning was no longer performed.

SUMMARY OF THE INVENTION An object of the present invention is to solve these problems and provide a head cleaning device that has a simple configuration and can reliably clean a magnetic head.

[Failure to solve the problem]

To achieve the above object, the present invention provides a support member that supports a soft material and allows the soft material to move in the direction of the rotating head device; a biasing means for biasing the support member; and a second moving member.

[Effect]

As the loading ring moves, the first or second moving member acts on the support member, but during the loading operation or during the unloading operation, the first or second moving member acts on the support member. The second moving member does not act on the support member, and the support member is biased by the biasing means to press the soft material against the rotary head device. As a result, the magnetic head is cleaned.

Further, the supporting member is moved against the biasing force of the biasing means by the first moving member when the loading operation is completed, and by the second moving member when the unloading operation is completed, and the soft material is moved from the rotating head device. Separate.

〔Example〕

First, a magnetic recording/reproducing apparatus using the present invention will be explained with reference to FIGS. 12 to 14.

FIG. 12 is a plan view showing the overall configuration of a magnetic recording/reproducing device using an embodiment of the head cleaning device according to the present invention, and shows a state in which unloading is completed, and 1 is a rotary head device; 2 is a chassis, 3 is a cassette, 4 is a magnetic tape, 5 is a supply reel, 6 is a take-up reel, 7 is a capstan, 8 is a pinch roller, 9 is a tension bin, 10 to 16 are guides, 17 is a loading ring, 18 is a guide plate, 19 is a guide base, 20 is a catcher, 21 is a head cleaning device according to the present invention, 22 is a soft material, and 23 is a guide surface.

In the figure, a rotary head device 1 is provided on a chassis 2, and a loading ring 17 is provided coaxially and rotatably therewith. Although not shown, the rotary head device 1 includes a rotary cylinder on which a magnetic head is mounted and a fixed cylinder, and these cylinders are inclined at a predetermined angle with respect to the chassis 2. A guide base 19 on which guides 11 to 13 are mounted is coupled to this loading ring 17 by means not shown. A guide plate 18 on which a rail-shaped or groove-shaped guide surface 23 is provided along approximately half of the outer circumference of the rotary head device 1 is fixed to the chassis 2, and when the loading ring 17 rotates, the guide base 19 is moved along the guide surface 23. 26.

A catcher 20 is provided near the rotary head device 1 at one end of the guide surface 23 .

A tension bin 9 is provided on the tape input side (left side in the drawing) of the rotary head device 1, and a capstan 7 is provided on the tape output side (right side in the drawing) rotationally driven by a capstan motor (not shown). In addition, a head cleaning device 21 is provided near the rotary head device 1.

Although the cassette 3 is installed, in the unloading state, the guide base 19 is located near the end of the guide surface 23 opposite to the end where the catcher 20 is provided. is located inside the magnetic tape 4 in the opening of the cassette B. Also, pinch roller 8
, the guide 10, 1516 is also the same.

The head cleaning device 21 has a soft material 22 for cleaning the magnetic head of the rotary head device 1, and the soft material 22 is detached from the rotary head device 1 during unloading.

Figure 13 shows the state of the magnetic recording/reproducing device during loading.
t is shown. As loading starts, the loading ring 17 rotates in the opening direction in the drawing. Along with this, the guide base 19 moves along the guide surface 26 on the guide plate 18, and the guide 13 mounted thereon pulls out the magnetic tape 4 from the cassette 3. The guide 10.degree. 15.16 and the pinch roller 8 are also moved from the inside of the opening of the cassette 3 to the outside by a moving member (not shown), whereby the magnetic tape 4 is pulled out from the cassette 3. When loading is in progress, the rotary cylinder (therefore, the magnetic head) of the rotary head device 1 rotates, and the soft material 22 of the head cleaning device 21 is in pressure contact with the rotary head device 1. . For this purpose, the magnetic head comes into contact with the soft material 22 and head cleaning is performed.

FIG. 14 shows the state in which the magnetic recording/reproducing device has completed loading. The loading ring 17 is the 13th
It further rotates a predetermined amount clockwise from the position shown in the figure and stops. As a result, the guide base 19 is moved to the catcher 2.
0 is crimped and fixed. Further, the tension bin 9 and the guides 10 to 16 are respectively set at predetermined positions to form a tape running path, whereby the magnetic tape 4 is wound around the rotary head device 1 at a predetermined angle. Further, the pinch roller 8 is pressed against the capstan 7 with the magnetic tape 4 sandwiched therebetween.

During recording and reproduction, the magnetic tape 4 is pulled out from the supply reel 5 by the rotation of the capstan 7 and runs along a tape running path. Capstan 7, pinch roller 8
The magnetic tape 4 that has passed between the reel motors (not shown)
It is wound up on the winding IJ-rule 6, which is rotationally driven by the winding IJ-rule 6. When loading is completed, the soft material 22 of the head cleaning device 21 is in a state of being separated from the rotary head device 1.

The operation of the unrope ink from the loading state is the reverse of the loading operation described above. That is, when the unloading operation starts in the state shown in FIG. 3, the loading ring 17 rotates counterclockwise. Along with this, the guide base 19 is the catcher 20.
The gold is separated and moves toward the cassette 3 along the guide surface 23 on the guide plate 18. The guides 10 to 16 and the pinch roller 8 move toward the cassette 3, and after passing through the state shown in FIG. 13, are housed in the opening of the cassette 6 as shown in FIG. 12.

Even during this state in the middle of unloading, the magnetic head of the rotary head device #1 is rotating, and the soft material 22 of the head cleaning device 21 is in pressure contact with the rotary head device 1. Therefore, the magnetic head is subjected to head cleaning by the soft material 22 in the same way as during loading.

Next, an embodiment of the head cleaning device according to the present invention will be described with reference to FIGS. 1 to 6. In addition, in the same figure, 24 is a shaft, 25 is a support member, 26 is a protrusion,
27 is a holding member, 28 is a compression spring, 29 is a spring support member, 30 and 31 are moving members, 32 and 33 are shafts,
34 and 35 are transmission members, 36 to 39 are engagement surfaces, 40 is a magnetic head, and 41 is an upper cylinder.
Parts corresponding to those in Figure 4 are given the same reference numerals.

1 and 2 are a plan view and a side view showing the head cleaning device in an unloading state.

In the figure, the support member 25 is held by a holding member 27 provided on the chassis 72 so as to be able to slide in the direction of the center of the loading ring 17 above the loading ring 17 (on the page), and is supported by a spring fixed to the chassis 2. A compression spring 28 whose one end is supported by a support member 29 biases the loading ring 17 toward the center thereof. A shaft 24 is attached to the top end of the support member 25, and a roller-shaped soft material 2 is rotatably attached to the shaft 24.
2 is provided. A protrusion 26 is provided at the same tip on the lower surface of the support member 25 .

Near the outside of the loading ring 17 is a shank) 32.
．． 33 is implanted in the chassis 2, and a rectangular transmission member 34, 35 is rotatably attached to each of these. Here, these transmission members 54, 35 are each supported on the shaft 2 at a bend. One end of each of the transmission members 34, 35 forms a locking surface 37, 39 in which the projection 26 of the support member 25 engages, and the other end of each of these transmission members 34, 35 The pin-shaped moving members 3 are implanted in the loading ring 17 at predetermined intervals.
0.3i It has a retaining surface 36.38i that engages with it.

In the unloading state, the projection 26 of the support member 25 biased by the compression spring 28 causes the transmission member 34 to
The locking surface 37 of the transmission member 35 is pushed counterclockwise around the shaft 32, and the locking surface 39 of the transmission member 35 is pushed clockwise around the shaft 33, but the moving member 30 of the loading ring 17 is stopped. The retaining surface 36 of the transmission member 34 is pressed against. That is, by the transmission member 34 being locked to the moving member 30, the support member 25 is prevented from moving toward the rotation center of the loading ring 17, and thereby the soft material 22 is separated from the rotating head device 1. .

FIGS. 3 and 4 are a plan view and a side view showing the head cleaning device in the middle of loading.

The loading ring 17 is rotating clockwise in FIG. 3 from the unloading state shown in FIG. 1. Along with this, the movable member 30 moves to the engagement surface 36 of the transmission member 34.
, and the holding force applied by the loading ring 17 to the support member 25 via the transmission member 34 disappears. For this purpose, the support member 25 is moved toward the rotation center of the loading ring 17 by the biasing force of the compression spring 28. As a result, as shown in FIG.
press against. Additionally, along with this movement of the support member 25,
The protrusions 26 push against the engagement surfaces 37.degree. 69, thereby causing the transmission members 34, 35 to pivot about the shirts 32, 33i, respectively, into the position shown in FIG.

Here, in the rotary head device 1, the upper cylinder 41 on which the magnetic head 40 is mounted rotates from the middle of loading. Therefore, the soft material 22 is applied with a rotational force from the upper cylinder 41, contacts the magnetic head 40 while rotating around the shaft 24, and cleans the magnetic head 40. Moreover, since the soft material 22 is in pressure contact with the upper cylinder 41, the upper cylinder 41 is also cleaned.

5 and 6 are a plan view and a side view showing the state when loading of the head cleaning device is completed.

When the loading ring 17 further rotates clockwise from the state shown in FIG. engage with. Then, when the loading ring 17 further rotates clockwise, the retaining surface 38 of the transmission member 35 is pushed by the moving member 31, and the transmission member 35 rotates counterclockwise about the shaft 63 from the state shown in FIG. . Along with this, the retaining surface 39 of the transmission member 35 engages with the protrusion 26 and the support member 25
is pushed, and the support member 25 moves in a direction away from the center of rotation of the loading ring 17 against the biasing force of the compression spring 28, resulting in the state shown in FIG. At this time, the soft material 22
is separated from the rotary head device 1, as shown in FIG.

During the unloading operation, the above loading operation is reversed. When the unloading operation starts from the state shown in FIG.
rotates counterclockwise.

Along with this, the moving member 61 moves the engagement surface 3 of the transmission member 65.
8, the transmission member 35 rotates clockwise around the shaft 33. Therefore, the support member 25 is supported by the compression spring 2
The soft material 22 is moved toward the center of rotation of the loading ring 17 by the urging force of the loading ring 8, and the soft material 22 is pressed against the rotating head device 1. The upper cylinder 41 of the rotary head device 1 rotates, and therefore the soft material 22 cleans the magnetic head 40 in the same way as during loading.

Engagement 15 of the transmission member 64 immediately before the completion of unloading.

When the movable member 30 engages with the ring 36 and the loading ring 17 further rotates, the transmission member 54 transfers to the shaft 32.
Rotate clockwise around the center. Along with this, the support member 25 moves in a direction away from the rotation center of the loading ring 170, and when unloading is completed, the soft material 2
2 detaches from the rotary head device 1.

As described above, according to the embodiment, the soft material can be reliably pressed against and removed from the rotary head device using a simple mechanism. Also,
Since the soft material contacts the magnetic head only during loading and unloading operations, there is no possibility that the soft material contacts the magnetic head excessively and damages the magnetic head. Furthermore, by changing the shape of the transmission member, a certain degree of freedom can be given to the arrangement of the moving member on the loading ring.

Next, another embodiment of the head cleaning device according to the present invention will be described with reference to FIGS. 7 to 11.

However, in the same figure, 42 is a spring support member, 43 is a shaft, 44 is a torsion spring, 45 and 46 are moving members, and 47
．． Reference numerals 48, 49, and 50 indicate the operation surfaces, and parts corresponding to those in FIGS. 1 to 6 are given the same reference numerals.

7 and 8 are a plan view and a side view showing the state of this embodiment at the time of unloading.

In the same figure, a shaft 24 is implanted in the upper surface of one end of the support member 25, similar to the previous embodiment shown in FIGS. 1 to 6, and a soft material 22 is rotatably attached to the shaft 24. is provided with a protrusion on the lower surface, and the other end is rotatably attached to the shaft 46. A coil portion of a screw spring is attached to this shaft 43, one end of which is attached to the support member 25, and the other end to the spring support member 42, respectively. The support member 25 is biased counterclockwise around the shaft 46 by the torsion spring 44 .

Additionally, wedge-shaped moving members 45 and 46 are provided on the loading ring 17 at predetermined intervals such that their tapered tips face each other. These movable members 45 and 46 have sides 47 and 49, which are the outer periphery side of the loading ring 17, without operation surfaces, and are inclined from the operation surfaces 47 and 49 toward the inner periphery side of the loading ring 17. These inclined sides 48 and 50 also form operating surfaces.

During unloading, due to the urging force of the torsion spring 44 and the state of the loading ring 17, the protrusion 26 of the support member 25 comes into contact with the operating surface 47 of one of the moving members 45, as shown in FIG. At times, the soft material 22 is spaced apart from the rotating head device 1, as shown in FIG.

When the loading operation starts, the loading ring 17
rotates clockwise, and the protrusion 26 of the support member 25 is removed from the moving member 45. 9 and 10 show this state in the middle of loading, and when the protrusion 26 is removed from the moving member 45, the support portion 25 is rotated counterclockwise around the shaft 43 by the biasing force of the torsion spring 44. The soft material 22 is brought into pressure contact with the rotary head device 1. As a result, the magnetic head 40 is cleaned.

When the loading ring 17 further rotates clockwise and the loading operation is completed, as shown in FIG.
The protrusion 26 of the support member 25 is connected to the operation surface 48 of the moving member 46.
After sliding, the loading ring 17 stops in contact with the operation surface 47, and the support member 25 is thereby rotated clockwise in contact with the biasing force of the torsion spring 44. Therefore, as shown in FIG. 8, the soft material 22 is separated from the rotary head device 1.

During the unloading operation, the operation is the reverse of the above loading operation 9, and even during unloading, the soft material 22 comes into pressure contact with the rotary head device 1 to clean the rotary head 40.

According to this embodiment, like the previously described embodiment, the structure is simple and the soft material is reliably pressed against the rotary head device using a mechanism with a small number of parts.

Secession is possible.

〔Effect of the invention〕

As explained above, according to the present invention, since the soft material is pressed against and removed from the rotary head device by the movable member fixed on the loading ring, malfunctions caused by repeated loading and unloading, The excellent effect of reducing the contact force to the rotating head and the change in contact angle over time can be obtained.

[Brief explanation of the drawing]

1 to 6 show an embodiment of a head cleaning device according to the present invention, and FIGS. 1 and 2 are plan views in an unloaded state. 6 and 4 are plan views and side views during loading, FIGS. 5 and 6 are plan views and side views in the loading state, and FIGS. 7 to 11 are according to the present invention. 7 shows a plan view in an unloading state, FIG. 8 shows a side view in an unloading state and a loading state, and FIGS. 9 and 10 show other embodiments of the head cleaning device. A plan view in the middle of loading, Fig. 11 is a plan view in the loading state, Fig. 12
14 are plan views showing an example of a magnetic recording/reproducing device using a head cleaning device according to the present invention,
FIG. 12 shows an unloading state, FIG. 13 shows a state in the middle of loading, and FIG. 14 shows a loading state. 1...Rotating head device 2...Chassis 17...Loading ring 21...Head cleaning device 22...Soft material 25...Support member 26...Protrusion 28...Compression splash 30.31...Moving member 34.35...Transmission member 40...Magnetic head 44...Torsion spring 45.46...Moving member.

Claims (1)

[Claims] 1. In a head cleaning device that cleans the magnetic head by bringing a soft material into contact with the rotating magnetic head of a rotary head device for magnetic recording and reproducing equipped with a tape loading mechanism, the soft material is a support member that allows the soft material to move in the direction of the rotary head device; a biasing means that biases the support member to move the soft material in the direction of the rotary head device; The soft material is moved by the first moving member when the loading operation is completed, and by the second moving member when the unloading operation is completed, respectively. By moving against the force, the soft material is separated from the rotary head device, and during loading and unloading operations, the soft material can be brought into pressure contact with the rotary head device by the biasing means. A head cleaning device characterized in that it is configured as follows.