JP2553346Y2 - Cleaning device for rotating magnetic head - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention relates to, for example, VTR, DAT
The present invention relates to a cleaning apparatus for cleaning a rotating magnetic head in an apparatus for recording and reproducing data on and from a magnetic tape using a rotating magnetic head.

[0002]

2. Description of the Related Art Conventionally, in an apparatus for recording and reproducing data on a magnetic tape using a rotating magnetic head such as a VTR or DAT,
In a cleaning device for a rotary magnetic head, a cleaning roller assembly including a bushing roller and a cleaning pad is rotatably mounted on a cleaning lever provided in proximity to a rotary drum by a shaft. When cleaning the rotating magnetic head, the cleaning roller assembly is brought into contact with the rotating drum to rotate the cleaning roller assembly with the rotation of the rotating drum to clean the surface of the rotating drum and the magnetic head.

[0003]

In the above-described conventional cleaning apparatus for a rotary magnetic head, the cleaning roller assembly simply rotates in the direction perpendicular to the axis of the shaft, and the friction between the cleaning pad and the rotary drum is reduced. Due to the small size, there is a disadvantage that the cleaning effect is not sufficiently obtained, and dirt, foreign matter and the like are difficult to remove.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above problems by rotating a rotating drum and a cleaning lever.
The freely supported cleaning member is pressed against the rotating
The cleaning member rotates with the rotation of the ram.
Cleaning the rotating magnetic head to clean the magnetic head.
In the cleaning device, the cleaning member is axially moved.
Movably in the direction of rotation, and rotation of the cleaning member.
Swings the cleaning member in its axial direction.
Moving means, while using a piezoelectric element as the rocking means.
Vibrating the cleaning member by the piezoelectric element.
The cleaning member swings in the axial direction .

[0005]

According to the present invention, the cleaning member is
Rotating the rotating drum while pressing it against the rotating drum
And the cleaning member is
By being swung in the axial direction of the rotating drum surface and
Relative speed and surface friction in magnetic head cleaning
Can be increased.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a rotary magnetic head cleaning device according to the present invention will be described below with reference to FIGS.

FIG. 1 is a schematic plan view of a VTR, a DAT, etc. in which a cleaning device for a rotary magnetic head according to the present invention is implemented. The rotary magnetic head device has a main chassis 1 as a base and is mounted on the main chassis 1. A rotary drum 2 coaxial with the fixed drum is pivotally mounted, and a pair of, for example, two magnetic heads 3, 3 are fixed to the rotary drum 2 so as to slightly project from the outer peripheral surface in the radial direction.

On both sides of the rotary drum 2 in the main chassis 1, guides for guiding an inlet-side pole base 4 and an outlet-side pole base 5 as tape supporting members during movement for loading and unloading of a magnetic tape, respectively. Grooves 6 and 7 are formed. In addition, an entrance-side rotation roller 9 and an exit-side rotation roller 10 for suspending and guiding a magnetic tape (not shown) in the tape cassette 8 are rotatably mounted on the entrance-side pole base 4 and the exit-side pole base 5, respectively. A supply side post 11 and a winding side post 12 for directly guiding the magnetic tape to the rotary drum 2 are provided.

A cleaning lever 13 is provided on the main chassis 1 in the vicinity of the rotating drum 2 and the shaft 1 at the end.
4, a cleaning roller assembly 15 is pivotally attached to the tip of the cartridge so as to be rotatable in the directions of arrows A and B. The cleaning lever 13 is normally urged in the direction A by a spring or the like.

The inlet-side rotating roller 9 and the outlet-side rotating roller 10 shown in FIG. 1 are in an unloading state, and are housed in a tape cassette 8 indicated by a dashed line. At this time, the cleaning lever 13 is attached in the A direction. Therefore, the cleaning roller assembly 15 is pressed against the fixed drum or the rotating drum 2.

Next, the contact state between the rotating drum 2 and the cleaning roller assembly 15 during cassette loading or tape loading is as follows. That is, after the tape cassette 8 is inserted, the cassette is horizontally moved in the direction of the rotating drum 2 and then vertically moved downward by cassette loading, and at this time, the cassette lid is opened and the tape cassette 8 is opened. The input side rotating roller 9 and the outlet side rotating roller 10
However, it faces the rotary drum 2 with a magnetic tape (not shown) interposed therebetween, and is in a state where the magnetic tape can be suspended. At this time, when the cassette vertical movement detection switch detects the vertical movement of the tape cassette 8 downward, the rotating drum 2 is rotated in the direction of arrow C by the rotation of a drum motor (not shown).

With the rotation of the rotary drum 2 in the direction C, the cleaning roller assembly 15 pressed against the rotary drum 2 is rotated in the direction of arrow D by frictional force.

After a lapse of a short time from the start of rotation of the rotary drum 2, a tape loading motor (not shown) is rotated to start tape loading, and the inlet pole base 4 and the outlet pole base 5 are respectively moved by arrows E.
Then, the magnetic tape is suspended by the inlet-side rotating roller 9, the supply-side post 11, the outlet-side rotating roller 10, and the winding-side post 12, and is pulled out from the tape cassette 8 and moved in the direction of the rotating drum 2. , Tape loading is performed.

The outlet-side pole base 5 moves in the direction F,
Immediately before the completion of the tape loading, the side portion of the cleaning lever 13 is pressed by the protrusion 16 provided on the outlet pole base 5, and the cleaning lever 13
Then, the cleaning roller assembly 15 is released from contact with the rotating drum 2 to complete the cleaning of the surface of the rotating drum 2 and the magnetic heads 3 by the cleaning roller assembly 15.

It is to be noted that the cleaning can be performed in a short time when the tape loading shifts to the unloading in the same manner as in the initial stage of the loading.

An embodiment in which the cleaning roller assembly 15 pivotally attached to the cleaning lever 13 is pivoted in the axial direction will be described.

FIG. 2 is a sectional view of the cleaning device according to the present invention.
7, a female screw 19 of the shaft 18 of the cleaning roller assembly 15 is screwed at the tip, and a projection 20 having a hemispherical cross section is provided near the female screw 19.

On the other hand, the cleaning roller assembly 1
Reference numeral 5 denotes a bushing roller 21 which is inserted into the shaft 18 and rotates freely, and a cleaning pad 22 which is mounted so as to cover the bushing roller 21. A similar hemispherical projection 23 is provided.

To attach the cleaning roller assembly 15 to the cleaning lever 13, a female screw 19 is required.
, And a spacer 2 is attached to the shaft 18.
4, the cleaning roller assembly 15 is inserted, and the stop washer 25 is fixed to regulate the cleaning roller assembly 15 downward.

In the cleaning device according to the embodiment shown in FIG. 2, the cleaning roller assembly 15 which rotates while being pressed against the rotary drum 2 is such that the projections 20 and 23 come into contact with each other and the projection 23 rides on the projection 20. When rotating, the cleaning roller assembly 15 is pushed upward on the shaft 18 against the gravity of the cleaning roller assembly 15. When the contact between the protrusions 20 and 23 is lost, the cleaning roller assembly 15 falls downward by its own weight. Is performed.

FIG. 3 is a sectional view of the cleaning lever of the cleaning device according to the present invention. Referring to FIG. 3, a female screw into which the shaft 18 of the cleaning roller assembly 15 is screwed is attached to the tip of the cleaning lever 26. A screw 27 is screwed, and a cam-shaped protrusion or groove 28 is provided around the female screw 27 over the entire circumference. For example, the shaft 18 of the cleaning roller assembly 15 described with reference to FIG. 2 is screwed into the female screw 27 of the cleaning lever 26.

In the cleaning apparatus according to the embodiment shown in FIG. 3, the cleaning roller assembly 15 which rotates while being pressed against the rotary drum 2 has the projection 23 always in contact with the cam-shaped projection or groove 28. For the shaft 1
The cleaning operation is performed by a smooth oscillating motion on 8.

The swing can be freely changed by the shape of the cam-shaped projection or the groove 28. For example, the number of swings can be adjusted by the number of peaks, the stroke can be adjusted by the height of the peak, and the swing speed can be adjusted by the length of the peak. 4 (a), 4 (b) and 4 (c)
Is the height (H) on the vertical axis and the circumferential angle (π) on the horizontal axis,
It shows a developed cross section when the combination of the number of peaks, the height of peaks, and the like in the protrusions or grooves 28 is changed.

Referring to FIG. 5, another embodiment of the cleaning roller assembly will be described. In this embodiment, a coil spring 29 is interposed between a bushing roller 21 on which a cleaning pad 22 is mounted and a stop washer 25. The same parts as those of the cleaning roller assembly 15 described in FIG.
Shaft 1 of the cleaning roller assembly 30
8 with the female screw 2 of the cleaning lever 26 shown in FIG.
7 to form a cleaning device.

In the cleaning device according to the embodiment shown in FIG. 5, in addition to the swinging motion of the embodiment shown in FIG. 3, the cleaning roller assembly 30 has a coil spring 29 stored when it is pushed upward. It is forcibly pushed down by the spring force, and the cleaning operation by a reliable swinging motion is performed.

Referring now to FIG. 6, another embodiment of the cleaning device will be described. The cleaning lever comprises an upper lever 31 and a lower lever 32.
3 is used as a fulcrum and attached to the lower lever 32 in a lever-like manner. A cleaning roller assembly 15 similar to that described above is provided at the tip of the upper lever 31.

Next, a suitable piezoelectric element 34 is fixed between the upper lever 31 and the lower lever 32 so that an alternating voltage can be supplied to both electrodes of the piezoelectric element 34.

Note that no projection is provided below the bushing roller 21 on which the cleaning pad 22 is mounted.

In the cleaning apparatus according to the embodiment shown in FIG. 6, by supplying an alternating voltage to the piezoelectric element 34 during the required time, the piezoelectric element 34 vibrates up and down mechanically, and therefore the upper lever 31 is also moved. The cleaning roller assembly 1 swings up and down with the vibration of the piezoelectric element 34.
5, the cleaning operation is performed.

[0030]

[Effects of the Invention] As described above, according to the present invention,
With the rotating member pressed against the rotating drum,
When rotating, the vibration is given by the piezoelectric element to
By rotating the bearing member in its axial direction,
Relative speed in cleaning ram surface and magnetic head
The surface of the rotating drum and the magnetic head.
Can be effectively cleaned,
The structure can be simplified and operated reliably.
You.

[Brief description of the drawings]

FIG. 1 is a schematic plan view of a VTR, a DAT, and the like in which a rotary magnetic head cleaning device of the present invention is implemented.

FIG. 2 is a sectional view of the cleaning device according to the present invention;

FIG. 3 is a sectional view of a cleaning lever of the cleaning device according to the present invention;

FIG. 4 is a developed sectional view of a protrusion provided on a cleaning lever of the cleaning device according to the present invention.

FIG. 5 is a sectional view of the cleaning roller assembly of the cleaning device according to the present invention;

FIG. 6 is a side view of another embodiment of the cleaning device according to the present invention.

[Explanation of symbols]

 2 rotating drum 13, 26 cleaning lever 15, 30 cleaning roller assembly 20, 23, 28 protrusion 21 bushing roller 22 cleaning pad 34 piezoelectric element

Claims (1)

(57) [Scope of request for utility model registration] A cleaning member rotatably supported by a cleaning lever pressed against a rotating drum, and a magnetic head is cleaned by the cleaning member rotating with the rotation of the rotating drum. the movable cleaning member in the axial direction, and while the Ru provided with rocking means for rocking the cleaning member in the axial direction with the rotation of the cleaning member, a piezoelectric element is used as the oscillating means, With the piezoelectric element
Vibration is applied to the cleaning member to remove the cleaning member.
A rotary magnetic head cleaning device characterized by swinging in the axial direction .