JPS6242332B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to maintenance of a rotating magnetic head type magnetic recording device without human intervention, and specifically, the present invention relates to a magnetic recording device for effectively cleaning the head of a rotating magnetic head type magnetic recording device. This relates to the head cleaning method.

High-speed, high-density rotating head magnetic recording devices that use magnetic tape as a recording medium use floating heads that rotate and scan while keeping a small gap between themselves and the magnetic tape. Because of the local contact with the magnetic head, dust that has fallen off from the magnetic surface of the magnetic tape adheres to the surface of the magnetic head. In addition, dirt such as dust also adheres to the surface. Such attached dust generally accumulates as the magnetic head rotates and scans, eventually resulting in continuous contact between the magnetic head and the tape, damaging the magnetic surface of the tape.

In order to prevent the accumulation of dust adhering to the magnetic head, a conventional cleaning method has been adopted in which the head is cleaned with a brush at intervals, for example, every time the rotating head is stopped. The cleaning effect was insufficient because the rotation direction was That is, since the surface shape of the magnetic head is spherical or pseudospherical, most of the dust adheres to the rear of the magnetic head, as shown in FIG. On the other hand, considering the cleaning operation, as is clear from FIG. 1, the brush first contacts the front and center of the magnetic head, so that the brush escapes from the magnetic head at the rear of the magnetic head. Therefore, a sufficient cleaning effect cannot be obtained.

Further, the conventional mechanism does not take into account shortening of cleaning time.

An object of the present invention is to eliminate the above-mentioned conventional drawbacks, and to provide a magnetic head cleaning method that can shorten the cleaning time of the magnetic head and reliably remove dust using a simple mechanism. It is in.

The configuration of the present invention to achieve this object includes a cleaning tool placed in contact with the rotating magnetic head, which starts the rotor to rotate in reverse with a large current at the start of cleaning, and at the same time rotates the rotor at a low speed during cleaning. The cleaning brush is pressed in this state.

Further, by providing a rotary cleaning tool, the cleaning tool is rotated in a direction opposite to the direction of rotation of the magnetic head to remove dust attached to the rear part of the magnetic head.

Incidentally, when cleaning the magnetic head, a rotor motor drive circuit (not shown) stops the forward rotation of the rotor that rotates the magnetic head and then rotates it in the reverse direction.
The operation is controlled by a timing circuit that generates the rotor motor rotation control timing and the head cleaning mechanism operation timing.

In order to shorten the time required for cleaning, sufficient cleaning effects can be obtained by simply rotating the rotor in the opposite direction during cleaning, without repeatedly rotating the rotor in the forward and reverse directions. It is desirable that the current applied to the rotor motor to stop and reverse the rotor be as large as possible in order to further shorten the time required for cleaning. The rotational speed of the rotor motor after reverse rotation is set lower than the normal rotational speed so as not to reduce the cleaning effect.

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

FIG. 2 is a conceptual explanatory diagram of a rotary magnetic head section and a cleaning tool in a magnetic recording device.

The rotary magnetic head section has a rotor 1, a magnetic head 2 fixed on the rotor 1, a rotor motor 6 coupled to the rotor 1, and an upper mandrel 7 and a lower mandrel 8 disposed above and below the rotor 1.

On the other hand, the cleaning tool includes a rotatable circular brush 3, a brush holding mechanism 4, a rotary solenoid 5, and the like.

FIG. 3 is a diagram showing the relationship between the rotor 1 and the cleaning tool in FIG. 2, and the rotary brush 3 is attached to the brush holding mechanism 4 so as to be rotatable via a shaft. The brush holding mechanism 4 includes a rotary solenoid 5
The rotational force of the brush presses the brush against the rotor 1 of the magnetic head 2, and the rotation of the rotor 1 pushes the brush against the magnetic head 2.
Clean. This cleaning operation is performed when the tape is removed from the apparatus (unloading), and is specifically started when the tape is removed from the rotor 1.

FIGS. 4a and 4b show the rotor motor rotational speed, rotor motor current, and timing at which the cleaning mechanism operates. When the tape is removed from the rotor 1 in an unloading operation, a reverse current is applied to the rotor motor 6 as shown in FIG. 4b. As shown in FIG. 4a, when the rotor 1 completes its reverse rotation and the reverse rotation speed reaches a predetermined value, the rotary solenoid 5 of the cleaning mechanism is activated, the rotating brush 3 is pressed against the magnetic head 2, and the magnetic head is cleaned. Ru.

Furthermore, in the present invention, a rotary solenoid or a motor may be coupled to the shaft of the rotating brush 3 in order to improve the cleaning effect, and a mechanism may be added for cleaning while rotating the rotating brush 3 in a direction opposite to the rotating direction of the magnetic head 2. .

It should be noted that the present invention is not limited to the structure having a rotary magnetic head section and a cleaning tool as shown in the previous embodiment, but various modifications can be made as specific examples of the inventive idea.

The magnetic head cleaning method of the present invention makes it possible to significantly increase the magnetic head cleaning effect by changing the microprogram that generates the rotor motor drive circuit and timing, without making any mechanical changes to conventional cleaning methods. Become.

With the above configuration, the rotor is started to rotate in reverse with a large current, and cleaning is performed at a low rotational speed, so that attached dust can be removed.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram illustrating how dust adheres to the magnetic head, Fig. 2 is a conceptual explanatory diagram of the rotary magnetic head section and cleaning tool in the present invention, and Fig. 3 is a diagram illustrating the rotor and cleaning tool in Fig. 2. FIG. 4a is a diagram showing the relationship between the rotor rotational speed and time during cleaning in the present invention, and FIG. 4b is a timing chart of the current at that time. Explanation of symbols, 1: rotor, 2: magnetic head,
3: Rotating brush, 4: Brush holding mechanism, 5: Rotary solenoid.

Claims (1)

[Claims] 1. In a magnetic head cleaning method for cleaning a rotating magnetic head embedded in a rotor, the rotor is started in the opposite direction to the normal rotation direction and with a current larger than the starting current during normal rotation at the start of cleaning, and
A cleaning method for a rotating magnetic head, characterized in that the rotating magnetic head is cleaned while pressing a rotating brush against the magnetic head while the rotor, which is reversely rotated by the activation, is rotated at a speed lower than the normal rotational speed.