JPS6025696Y2 - Magnetic head cleaning mechanism - Google Patents

Description

[Detailed Description of the Invention] [Subject of the Invention] The present invention relates to a magnetic head cleaning mechanism of a magnetic tape device.

[Conventional technology and problems]

In recent years, with the increasing density of information recording in magnetic tape devices, contamination due to dust adhesion on the surface of the magnetic head has become a very serious problem as it causes errors in recording or reading information and reduces the reliability of the device. Become.

In order to solve these problems, various magnetic head cleaning mechanisms are used.

FIG. 1 shows an example of a conventional method.

A brush 5 is provided at one end corresponding to the magnetic head 3, and an operating lever 1 is engaged with a disc 2 driven by a motor at the other end, and is engaged with a slot provided in the operating lever 1. A disk 2 is driven by a motor, and the tip of the operating lever 1 equipped with a brush 5 is made to draw an elliptical trajectory on the magnetic head surface 3 to remove dust on the magnetic head 3. remove.

However, the timing for operating this mechanism is limited to when there is no magnetic tape on the magnetic head surface.

[Purpose of invention]

The purpose of this invention is to eliminate the above-mentioned conventional problems, and to provide a magnetic head cleaning mechanism that can clean the magnetic head regardless of the presence or absence of magnetic tape on the magnetic head surface. It is in.

[Key points of the idea]

This invention consists of a fixed gear, an arm that rotates around the fixed gear, an idler gear that is rotatably fixed to the arm and meshes with the fixed gear, a brush drive gear that meshes with the idler gear, and a brush mounted on a part of the outer periphery. It consists of a rotating brush with embedded bristles.By rotating the arm, the brush rotates on its own axis and at the same time revolves around the magnetic head.This rotating brush cleans the surface of the magnetic head, and when cleaning is completed, it removes the magnetic tape. This is a magnetic head cleaning mechanism characterized by retracting the magnetic head to a position where it does not interfere with the running of the magnetic head.

[Example of idea]

Next, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 2 shows a front view of the magnetic tape device.

As shown in FIG. 2, after the magnetic tape 12 wound on the supply reel 7 is wound on the take-up reel 8, when a load button (not shown) is pressed, the supply reel 7 and the take-up reel 8 are automatically moved. The magnetic tape is drawn into the vacuum columns 9 and 10, and the magnetic tape is ready to run.

However, in order to facilitate the operation of winding the magnetic tape 12 around the take-up reel, a leader tape is wound around the take-up reel 8 in advance. A mechanism is often used that allows magnetic tape loading by simply connecting the tape with a special connector.

In this type of magnetic tape device, the magnetic tape 12 is always located below the magnetic head 3, and the mechanism shown in FIG. 1 cannot be adopted.

In FIG. 3, an arm 18 rotatable around a sector-shaped fixed gear 13, an idler gear 14 rotatably fixed on the arm 18 and meshing with the fixed gear 13;
A brush drive gear 15 is rotatably fixed on the idle gear and meshing arm 18.

A rotating brush 17 having nylon bristles embedded therein is detachably fixed to the drive gear 15.

Now, when the arm 18 rotates counterclockwise, the rotating brush 17 rotates around the drive gear 15 and revolves around the magnetic head 3 at the same time.

As shown in FIG. 5, when a rotating brush 17 having brush bristles embedded in a part of its outer periphery is used, the locus of the tip of the brush bristles becomes like a dashed line.

Now, if the rotation ratio of the fixed gear 13 and the driving gear 15, the length of the arm 18, and the length of the bristles of the rotating brush 17 are selected appropriately, the tip of the bristles of the brush will come into contact with only the tip of the magnetic head 3. Only the portion of the tip of the magnetic head 3 that requires cleaning can be cleaned.

Therefore, there is less resistance during operation of the cleaning mechanism, and less damage and dirt to the brush bristles.

Furthermore, even if there is a magnetic tape under the magnetic head 3, the cleaning operation begins after the brush presses down the magnetic tape at part A indicated by the dashed-dotted line, so the magnetic head can be cleaned regardless of the presence or absence of the magnetic tape. It is.

The arm 18 rotates counterclockwise and then clockwise,
It is evacuated to the position shown in FIG. 3 so as not to interfere with the running of the magnetic tape.

At this time, the rotating brush 17 comes into contact with the magnetic head 3 twice in total and performs back-to-back cleaning, which increases the cleaning effect.

The driving source of this cleaning mechanism is as shown in Fig. 4. When the arm 18 is driven by the rotary solenoid 16, the arm rotates counterclockwise when the rotary solenoid's power is turned on, and when it is turned off, the rotary solenoid's own return spring is activated. Since the cleaning mechanism returns in the clockwise direction, control of the cleaning mechanism is extremely simple and a highly reliable mechanism is obtained.

The operating timing of the cleaning mechanism is based on vacuum columns 9 and 10.
This is effective regardless of whether there is a magnetic tape under the magnetic head 3 as long as no vacuum pressure is supplied to the tape, that is, no tension is applied to the tape.

[Effects of this invention]

With the configuration described above, the following effects can be obtained in the present invention.

■ Since the brush is inserted from the running direction of the magnetic tape, it can be cleaned regardless of whether there is magnetic tape under the magnetic head.

■ The combination of a rotating brush with bristles embedded in part of its outer periphery and a planetary gear allows the magnetic tape to come into contact with the brush, which is easily soiled and which only contacts the tip of the magnetic head, which is directly involved in writing and reading information. Since the brush is not cleaned, the wear life of the brush is extended, and only the necessary dust is cleaned, so the brush is less dirty and the deterioration of cleaning ability due to brush dirt is also reduced.

Furthermore, since the operating resistance of the arm is low, the driving source can be small.

(2) Since cleaning work is always performed on the magnetic head surface when the arm moves, the magnetic head is cleaned twice in one round trip of the arm, resulting in a large cleaning effect.

■ Because the structure is simplified, the reliability of the cleaning operation is extremely high, and the same effect can be obtained against parts breaking.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of a conventional magnetic head cleaning mechanism, Fig. 2 is a front view of a magnetic tape device, Fig. 3 is a front view of a magnetic head cleaning mechanism according to the present invention, and Fig. 4 is shown in Fig. 3. FIG. 5 is a perspective view of the rotating brush. Explanation of symbols: 3 is a magnetic head, 13 is a fixed gear, 14 is an idle gear, 15 is a drive gear, 16 is a rotary solenoid, 17 is a rotating brush, 18 is an arm

Claims (1)

[Scope of utility model registration request] a fixed gear; an arm that rotates around the fixed gear;
an idler gear attached to the arm so as to mesh with the fixed gear and rotate when the arm moves; a brush drive gear rotatably attached to the arm so as to mesh with the idler gear; and a rotation of the brush drive gear. and a rotating brush whose cleaning surface is a part of the outer periphery, the fixed gear is disposed on the magnetic head side with respect to the magnetic tape running surface, and the rotation of the rotary brush causes the rotating brush to rotate. A magnetic head cleaning mechanism that cleans the surface of the magnetic head by revolving around the magnetic head while rotating.