JPH03134813A - Rotary magnetic head cleaning device for magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To reduce the cost of a rotary magnetic head cleaning device while prolonging the life of a cleaning member by successively changing an abutted spot between a magnetic head and the cleaning member in each operation for press-fixing the cleaning member to the magnetic head by utilizing the motion of a member to execute an operation for pulling-out a magnetic tape and winding it around a rotary cylinder and an operation for housing the magnetic tape in a cassette. CONSTITUTION:While pulling-out and housing the magnetic tape, the tip of a pull-out arm 103 is abutted to the cam part of a driving lever 6 and the driving lever 6 is forcedly turned. In the middle of this turning operation, a cleaning member 1 is abutted to a rotary cylinder 105 and suitable pressure can be obtained. When the driving lever 6 is operated, a ratchet lever 5 is engaged to a cam roller 4 and the cam roller 4 is rotated at a prescribed rotating angle. By the operation of unidirectional clutch coil member 7, the cam roller 4 is turned only at the prescribed rotating angle each time the driving lever 6 is operated, and the cam abutting part of a shift lever 2 is vertically turned. Then, the cleaning member 1 successively changes the position in a vertical direction. Thus, the same spot is not severely used and the life of the cleaning member 1 is prolonged.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cleaning device for a magnetic head mounted on a rotating cylinder of a home video tape recorder (hereinafter referred to as VTR).

[Conventional technology]

A conventional device is equipped with a cleaning brush that cleans a magnetic head in one rotation as described in Japanese Patent Application Laid-Open No. 1-191317, and the rotational axis of the cleaning brush is arranged in the circumferential direction with respect to the rotational axis of a rotating cylinder. Some are tilted to improve the cleaning effect.

As is well known, if foreign matter or dirt adheres to the surface of the rotary magnet, normal magnetic recording and reproduction on the magnetic tape will not be possible. Particularly in home VTRs, the rotating magnetic head is used to record and reproduce video information on magnetic tape, and if foreign matter or dirt adheres to the surface of the rotating magnetic head (magnetic gap area), the magnetic This results in spacing loss between the head and the magnetic tape, which prevents normal recording and playback of video information, making it impossible to display beautiful images on the TV screen, and significantly reducing product value. turn into. Therefore, the conventional device provides a magnetic head cleaning device in view of this point.

[Problem to be solved by the invention]

However, the above conventional technology simply tilts the rotating shaft of the cleaning brush (cleaning member), and the contact point between the magnetic head and the cleaning member is always the same, so the cleaning member becomes dirty in a short period of time. However, it was insufficient in terms of prolonging the life of the so-called cleaning member. Furthermore, there is room for improvement in streamlining and lowering the cost of the entire cleaning device. That is, the above-mentioned conventional technology uses a plunger to operate the cleaning member, and as is well known, when an electromagnetic component such as a plunger is used, a driving electric circuit etc. are also required.
The cost was quite high, making it particularly unsuitable for application to home VTRs and the like.

SUMMARY OF THE INVENTION An object of the present invention is to extend the life of the cleaning member and reduce the cost of the apparatus by sequentially changing the contact point between the magnetic head and the cleaning member each time the cleaning member is pressed onto the magnetic head.

[Means to solve the problem]

In order to achieve the above object, the present invention utilizes the movement of a member that pulls out a magnetic tape stored in a cassette and winds it around a rotating cylinder and stores the magnetic tape in the cassette. This mechanism allows the cleaning member to be pressed onto and separated from the magnetic head, and the position of contact of the cleaning member against the magnetic head can be sequentially changed each time the magnetic tape is pulled out and stored.

[For production]

The cleaning member is configured to press against the rotating magnetic head in conjunction with the pulling out and storage operations of the magnetic tape in the cassette, and the cleaning member is separated from the magnetic head when the pulling out operation and storage operation are completed. Because of this structure, the pressing operation time of the cleaning member is approximately 1 to 2 seconds, and there is no risk of damage to the magnetic head. In addition, since the support height of the cleaning member is changed using the movement of the member that performs the crimping operation of the cleaning member, the crimping operation and the change in the support height position are performed in complete synchronization, resulting in a stable It is possible to obtain a working device.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
6 to 6 show embodiments of the present invention. FIG. 1 is a plan view of the main part in operation, FIG. 2 is a sectional view of the cleaning member, FIG. 3 is a plan view of the operating state, and FIG. 4 is a non-operating plan view. FIG. 5 is a plan view of the state, FIG. 5 is a side view of the main part in operation, and FIG. 6 is an exploded perspective view of the main part. Further, FIG. 7 shows a state in which the magnetic tape is housed in the cassette, and FIG. 8 shows a state in which the magnetic tape is pulled out of the cassette. FIG. 9 is a plan view of the tape drawer in a non-operating state, and FIG. 10 is a plan view of the tape drawer in an operating state.

First, an outline of the mechanism of a home VTR equipped with the head cleaning device according to the present invention will be explained. As shown in FIG. 7, the household VTR according to the present invention has a magnetic tape 10 wound around a reel 108 in a cassette 107.
6 is stored. When a video signal is to be recorded and reproduced on the magnetic tape 106, the magnetic tape 106 is pulled out by the tape drawer 109 in the direction of the arrow as shown in FIG. A rotating magnetic head 104 mounted on the magnetic tape 106 performs magnetic recording and reproduction on the magnetic tape 106 (this is a well-known technique).

The details of one embodiment of the present invention in a VTR in which the magnetic tape 106 is ejected from the cassette 107 and stored in this manner will be described in detail below. First, the configuration will be explained, and then the operation will be explained.

In FIGS. 9 and 10, the output shaft 11 of the motor 110
A worm gear 111 is integrally connected to 0α. A worm wheel 112 that engages and rotates with a worm gear 111, and a cam gear 113 that engages and rotates with the worm wheel 112 are rotatably supported on the chassis 100. The cam gear 113 has cam groove 1 on the back side.
13α and installed on the drawer arm 103 with the rotation axis of the worm wheel 1120 as the rotation axis.
03α is fitted into the cam groove 116α. A rotation shaft hole 105c is provided at one end of the pull-out arm ios, a rack engagement hole 105d is provided at the other end, and an arcuate portion 103b is provided at the tip thereof.

A rack plate 114 mounted on the chassis 100 so as to be slidable in the longitudinal direction is provided with a rank gear 114α at one end and a rank boss 114b at the other end.
4b is inserted into the rack engagement hole ID3d of the drawer arm 106. The tape drawer 109 is connected to the chassis 100
The drive gear 115. Due to the rotation of N6, the first arm 117,1
19 and second arms 118, 120, it is configured to be movable a predetermined distance. The above is the configuration for pulling out and storing the magnetic tape 106 from the cassette 107.

Next, FIG. 1 shows the configuration of the head cleaning mechanism.

This will be explained using FIGS. 2, 6, 4, 5, and 6. The structure of the cleaning member 1 (Fig. 2) is as follows:
The camping body 1h is inserted into the shaft 1a and press-fitted to the shaft 1α from above. The lower part of the shaft 1α has a flange portion 1c. The cleaning member 1 is rotatably disposed on the outer periphery of the rotary cylinder 105 at a height such that it can come into contact with the rotary magnetic head 104 on a shaft 6α erected on the cleaning arm B. That is, the cleaning arm 6 is provided with the aforementioned shaft 6α on the tip side, a rotation shaft hole 3c on the other end side, and a shift lever hole 5b on the middle part. The shift lever 2 is inserted into the shift lever hole 6b of this cleaning arm 3.
The shift lever shaft 2b is fitted, and the shift lever 2
is rotatably supported with respect to the cleaning arm B.

In this state, the operating portion 2α provided at the tip of the shift lever 2 is inserted between the flange portions 1c of the cleaning member 1.

Further (FIG. 5), a spring body 9 is provided between the shift lever 2 and the cleaning arm 3, so as to bias the cleaning member 1 upward.゛Also, the operation part 2α of the shift lever 2
A cam contact portion 2c is provided at the end opposite to the cam contact portion 2c.

The cleaning arm 6 in which the cleaning member 1 and the shift lever 2 are installed in this manner is mounted on a support post 101 erected on the chassis ioO.
(After the drive lever 6 is assembled into the support column 101), it is assembled through the rotation shaft hole 3c. A cam roller 4 is disposed at a position where it can come into contact with the cam contact part 2c of the shift lever 2 incorporated in the cleaning arm 6 (in this embodiment, a position below the cam contact part 2c), and the cam roller 4 is attached to the chassis 100. It is incorporated together with the one-way clutch coil member 7 into an upright roller shaft 102 .

The upper end surface portion of the cam roller 4 forms an end surface cam portion 4α, and the lower portion thereof forms a serrated portion 4h. Further, the one-way clutch coil member 7 is attached to the seat portion 102 of the roller shaft 102.
α and the shaft cylinder portion 4c formed on the cam roller 4.

Here, the one-way clutch coil member 7 is formed into a cylindrical shape by spirally winding a spring stainless steel wire or the like while maintaining the inner diameter.

Seat 1 with respect to the inner diameter of this one-way clutch coil member 7
02a and the outer diameter of the shaft cylindrical portion 4c are set slightly larger, and by making the helical winding direction of the one-way clutch coil member 7 right-handed, the cam roller 4 is rotated in the direction of the R arrow (in FIG. 1). A so-called one-way rotation mechanism is obtained in which rotation is possible in the clockwise direction (clockwise rotation), but rotation in one counterclockwise direction is prevented (i.e., a one-way clutch mechanism using a well-known coiled spring) is obtained. Form).

Further, the support column 10 is installed upright on the chassis 100 described above.
1, a drive lever 6 which also rotates around the support 101 is installed on the lower side of the cleaning arm 3 by inserting a rotation shaft hole 6C into the support 101.

Here, the configuration of the drive lever 6 is as follows.

A cam portion 6α is formed below the middle of the drive lever O, and a circular arc portion 103 formed at the tip of the pull-out arm 103
It is operated at h. Further, a boss 6b, a locking pawl 6e, and a hook portion 6d are provided on the upper surface of the intermediate portion.

The inverted ratchet lever 5 has a claw portion 5α on one end,
The other end side is provided with an integrally formed elastic arm portion 5b for urging the ratchet lever 5, and has a shaft hole 5C in the middle portion, which is inserted into the boss 6b of the drive lever B and engaged. The retainer 6c is used to prevent the ejector from falling, and the ratchet lever 5 is placed on the drive lever 6 so as to be rotatable within a predetermined range.The ratchet lever 5 is rotated clockwise by the elastic arm 5b (Fig. 1). Powered and installed.

In addition, a hook portion 6 is provided on the side surface of the middle portion of the drive lever 6.
A spring body 11 is suspended between f and the chassis 100,
A clockwise rotational force is applied to the drive lever 6. The drive lever 6, which is rotatably attached to the column 101, is further provided with a protrusion 6da near the rotation axis 6c. When the arm 3 is installed, the locking portion 3d is configured to abut against the protrusion 6g, thereby preventing the cleaning arm 3 from rotating counterclockwise relative to the drive lever B. . A spring body 1o is attached to the tip of the hook portion 6d of the drive lever 6 and the locking portion 6d of the cleaning arm 3, and the drive lever 6 has a clockwise rotational force and the cleaning arm 6 has a counterclockwise rotational force. (by the spring body 1o)
They are connected via a spring body 10.

The operation of one embodiment of the present invention in the above configuration will be described next.

As mentioned above, the cassette 107 also pulls out and stores the magnetic tape 106 by rotating the motor IIO (9th
10), the worm gear 110, the worm wheel 112, and the cam gear 113 are rotationally driven, and the cam groove 113α of the cam gear 113 is also rotationally displaced. As a result, the pull-out arm 103 rotates in the direction of the arrow (clockwise rotation) in FIG. 10, and pulls up the rack plate 114 in the direction of the arrow.
, 116 are rotationally driven, and the first arms 117, 119
, the tape drawer 109 moves via the second arms 118 and 120 to pull out the magnetic tape 106, wrap it around the rotary cylinder 105, and perform predetermined magnetic recording and reproduction by the rotary magnetic head 104. I have explained so far. ``Furthermore, when storing the magnetic tape 106 into the cassette 107, the above-mentioned operation is performed in reverse. In order to always perform normal magnetic recording and reproduction, as described above, there must be no dirt or foreign matter adhering to the surface of the rotating magnetic head 1040, especially near the magnetic gap.

The operation of the present invention, which uses the power of the pull-out arm 103 that operates when pulling out and storing the magnetic tape 106 to manufacture a head cleaning device and which makes it possible to always perform magnetic recording and reproduction normally, will be explained below. . FIG. 4 shows the device according to the invention in a non-operating state. FIG. 3 shows the operating state of a similar device. Further, FIG. 1 explains this FIG. 6 in detail.

The pull-out arm 103, which operates to pull out and store the magnetic tape 106, is displaced from P1 to P2 and P3 (in FIGS. 3 and 4). Pl is magnetic tape 106
P6 is when the magnetic tape 106 is pulled out,
P2 is in the process of pulling out or storing the magnetic tape 106. Normally, when the device is in the non-operating state as shown in FIG. 4, the drive lever 6 is biased to rotate clockwise by the spring 11 and is locked to the end face of the chassis 100 in the direction of the arrow. In this state, the locking portion 3d of the cleaning arm 3 is locked to the protrusion 6!1 of the drive lever 6 by the spring body 10, and the cleaning roller 1 placed on the cleaning arm 3 is also connected to the rotating cylinder. They are separated.

Next, the effects of the operating state of the device shown in FIGS. 1 and 6 will be explained. While the magnetic tape 106 is being pulled out and stored, the pull-out arm 103 is located near P2. At this time, the circular arc portion ID5b at the tip of the pull-out arm 103 comes into contact with the cam portion 6α of the drive lever B, and as a result, the drive lever 6 is forced counterclockwise (in the direction of the arrow) at a predetermined angle. It is rotated against a force of 110. This action also causes the cleaning arm 3 to rotate in the same way.
By configuring the cleaning member to come into contact with the rotating cylinder 105 during this rotational movement, the protrusion 61 of the drive lever O and the locking part 6d of the cleaning arm 3 will be separated. As a result, a biasing force for counterclockwise rotation by the spring body 10 is applied to the cleaning arm 6 and the cleaning member 1. That is, by appropriately setting the load of the spring body 10, an appropriate pressing force on the cleaning member 10 rotating cylinder 105 can be obtained.

Also, as a matter of course, the cleaning member 1 is mounted on the rotary cylinder 105 by driving the one-rotation cylinder to rotate at least while the cleaning member 1 is being pressed against the rotary cylinder 105 (the rotation driving means for the rotary cylinder is omitted). The rotating magnetic head 104 can be cleaned (IJ-cleaned). Further, a ratchet lever 5 is mounted on the drive lever 6 (FIG. 1), and when the drive lever 6 moves in the direction of the arrow, the claw portion 5α of the ratchet lever 5 engages with the serrated portion 4b of the cam roller 4. The cam roller 4 is rotated clockwise (in the direction of arrow R) by a predetermined rotation angle. Since the cam roller 4 does not rotate counterclockwise due to the action of the one-way clutch coil member 70 assembled at the bottom, it rotates by a predetermined rotation angle in the direction of the arrow R each time the drive lever B is operated.

As shown in FIG.
The cam contact portion 2c of the shift lever 2 rotates up and down, and as a result, the flange portion 1c of the cleaning member 1 is operated by the operating portion 2a of the shift lever 2. The function is to sequentially change the position in the height direction each time.

This makes it possible to change the height position of the photographing member 1 that contacts (presses) the rotating magnetic head 104.
This eliminates the need for the same location to be overworked, making it possible to extend the life of the cleaning member 1.

In addition, the material of the cleaning member 1 may be a rotating magnetic material, a soft material that does not cause damage to the rad 104, or
Of course, cloth materials, paper materials, etc. can be used, and it goes without saying that it is important to use the most suitable materials.

〔Effect of the invention〕

Since the present invention is configured as described above, it produces the effects described below.

By using the power associated with the operation of pulling out and storing the magnetic tape 106 in the cassette 107, it is possible to contact the rotating magnetic head 104 without installing a special power source (for example, a plunger, a motor, etc.). (Suppression) It is possible to obtain a cleaning device for the rotating magnetic head 104 in which the height of the cleaning member is successively changed to extend the life of the cleaning member.

[Brief explanation of the drawing]

FIG. 1 is a plan view of essential parts of an embodiment of the present invention, FIG. 2 is a cross-sectional view of a cleaning member of an embodiment of the present invention, and FIG. 3 is a plan view of an operating state of an embodiment of the present invention. FIG. 4 is a plan view of an embodiment of the present invention in a non-operating state, FIG. 5 is a side view of an embodiment of the present invention in an operating state of essential parts, and FIG. 6 is an exploded perspective view of essential parts of an embodiment of the present invention. Figure 7 is a diagram of the magnetic tape stored in the cassette, Figure 8 is a diagram of the magnetic tape pulled out of the cassette, Figure 9 is a plan view of the tape drawer in a non-operating state, and Figure 10 is the tape FIG. 3 is a plan view of the drawer in an operating state. 1...Cleaning member 2...
・・・・・・ Shift lever 3・・・・・・・・・・・・
・Cleaning arm 4・・・・・・・・・・・・・・・ Cam roller 5・・・・・・・−・・Ratchet lever 6・・・・・・・・・・・・・・・・・Drive lever 106
・・・・・・・・・Drawer arm

Claims (1)

[Claims] 1. In a magnetic recording and reproducing device configured to pull out a magnetic tape stored in a cassette and wrap it around a rotating cylinder equipped with a magnetic head, the magnetic head is moved in conjunction with a member that pulls out or stores the magnetic tape. The device is equipped with a cleaning member that comes into contact with the magnetic head to clean the magnetic head, and is characterized in that the position of the cleaning member relative to the magnetic head is sequentially changed in conjunction with a magnetic tape pull-out operation or a tape storage operation. A head cleaning device for magnetic recording and reproducing devices.