JPH0554563A - Initial adjusting method for magnetic head position - Google Patents

Abstract

PURPOSE:To prevent the terminal of a step motor and a flange part from projecting to the outside from the frame part of a magnetic head in the initial adjustment of a magnetic head feed mechanism part. CONSTITUTION:The feed mechanism part of an FDD is constituted so that a lead screw 9 is formed on the rotary shaft of a step motor 1, a carriage 8 is moved by a follower pin 6 abutting on this screw and the magnetic head 7 on the carriage is moved in the direction of a medium. When the magnetic head 7 is in a fixed position (distance L) from the center of the rotary shaft 13 of a spindle motor 12 rotating the medium, the rotation of the step motor 1 is controlled within the range of a fixed rotating angle to the groove position of the follower pin 6 abutting on the lead screw 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides a magnetic head feed mechanism with a step motor having a lead screw formed on a rotary shaft and a follower pin having a carriage fixed to the groove of the lead screw. The present invention relates to an initial adjustment method of a magnetic head position in a floppy disk drive (hereinafter abbreviated as FDD).

[0002]

2. Description of the Related Art Conventionally, in a magnetic head feeding mechanism of this type of FDD, the excitation of a step motor is switched to rotate a rotor, and a lead screw formed on the rotor is used to position the magnetic head on a floppy disk of a medium. Although it is moved in the (FD) track direction, since the magnetic head feed mechanism has versatility, the stator of the step motor is rotated so that the magnetic head is positioned within a certain range from the medium. Initial adjustment for positioning to.

[0003]

However, in the conventional magnetic head feeding mechanism described above, the rotation angle required for the stator of the step motor is about four times the step angle of the step motor in order to adjust the position of the magnetic head. Size, so when initially adjusting the position of the magnetic head,
In some cases, the terminal portion provided on the outer peripheral portion of the stator and the flange formed on the stator for mounting the step motor protrude outside the frame portion that fixes the feeding mechanism of the magnetic head.

In view of the problems of the magnetic head feeding mechanism in the conventional FDD described above, the present invention allows the terminal portion of the step motor, or the flange of the stator thereof to extend outside the frame portion for fixing the magnetic head feeding mechanism. It is an object of the present invention to provide an initial adjustment method of the magnetic head position that can easily limit the magnetic field.

[0005]

SUMMARY OF THE INVENTION According to the present invention, a magnetic head mounted on a carriage is fixed by a follower pin which fixes a carriage that abuts and slides on a groove of a lead screw formed on a rotary shaft of a step motor. In a floppy disk drive provided with a magnetic head feed mechanism that is configured to be driven to rotate by a spindle motor and moved in the direction of the medium, the magnetic head is positioned at a constant distance from the center of the spindle motor rotation axis. In that case, the rotation angle allowed by the step motor is restricted within a certain angle with respect to the groove position of the lead screw with which the follower pin is in contact.

[0006]

According to the present invention, the rotation angle of the stator of the step motor is regulated, whereby the problem of the terminal portion and the flange of the step motor protruding outside the frame portion for fixing the feeding mechanism of the magnetic head is prevented. It

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a top view showing the structure of a magnetic head feeding mechanism in one embodiment of the present invention.
Is a step motor, 2 is a stator of the step motor, and 3 is a flange provided on the stator 2, and is fixed to a frame portion 5 of a feed mechanism of the magnetic head by a screw 4. 6
Is a follower pin, which is fixed to a carriage 8 on which the magnetic head 7 is placed and which moves. Reference numeral 9 is a lead screw, and the rotary shaft 10 of the step motor 1 forms a rotor 11 (see FIG. 2). Reference numeral 12 denotes a spindle motor, which rotates an FD (not shown) of the medium by a rotation shaft 13.

FIG. 2 shows the rotor 11 formed on a part of the rotary shaft 10 of the step motor 1 in FIG. 1 as described above. The rotor 11 is made of a permanent magnet, and has a diameter of 5 to 8 mm, for example. It is formed to a degree. The step motor 1 is driven by two-phase excitation.

In the FDD magnetic head feeding mechanism constructed as described above, first, the rotor 11 rotates when the excitation phase of the step motor 1 is switched. At that time, the rotational movement of the step motor 1 is converted into a linear movement by the lead screw 9 formed on the rotary shaft 10 of the rotor 11 and the follower pin 6 that abuts and slides in the groove portion, and the magnetic head 7 is mounted. The carriage 8 placed is moved in the track direction of the medium driven by the spindle motor 12.

At this time, the step motor 1 switches the excitation twice according to the phase of the applied power source, and the rotor 11 rotates at an angle twice the step angle. On the other hand, the polarity of the rotor 11 is 10 pole excitation, so the step angle is 18 ° and it rotates 36 ° for one track, and the pitch of the groove portion of the lead screw 9 corresponding to the rotation angle is changed. Corresponding movement is given to the carriage 8, and the magnetic head 7 moves in the track direction by the movement amount.

Since the magnetic head feed mechanism has versatility so that it can be interchanged, the magnetic head 7 requires positioning within a certain range at the initial stage of assembly of the magnetic head feed mechanism, and the positioning is incomplete. The worst case is FD
Read error will occur. Therefore, the present invention allows the above adjustment to be performed as follows.

That is, the rotary shaft 13 of the spindle motor 12
The step motor 1 is rotated so that the magnetic head 7 is located at a distance L from the center of the magnetic head 7. At this time, the magnetic head 7 is located at the distance L from the center of the rotary shaft 13 of the spindle motor 12 in advance. The magnetizing angle of the 10 poles of the rotor 11 of the step motor 1 is restricted within a certain range with respect to the groove position of the lead screw 9 with which the follower pin 6 is in contact. By this regulation, the initial position of the magnetic head 7 can be adjusted by changing the rotation angle of the stator 2 to the step angle of 1.5.
The adjustment can be performed within twice (within this embodiment, within 27 °).

As described above, the present invention regulates the rotation angle of the stator 2 of the step motor 1 at the time of adjusting the initial position of the magnetic head feeding mechanism, and at the time of the initial adjustment, the terminal portion of the step motor 1 and The flange 3 is prevented from protruding from the frame portion 5 of the magnetic head feeding mechanism.

In the above embodiment, the rotor 11 of the step motor is divided for each excitation phase as shown in FIG. 2, but it is not always necessary to divide it, and the step motor 1 in FIG. The follower pin 6 may be a bearing ball or the like, and the follower pin 6 may be in contact with the groove portion of the lead screw 9 from the opposite side in the drawing.

[0015]

As described above, the magnetic head position adjusting method of the present invention initially regulates the rotation angle of the stator of the step motor that moves the magnetic head. The flange does not stick out from the frame of the magnetic head feeding mechanism.

[Brief description of drawings]

FIG. 1 is a top view showing a magnetic head feeding mechanism portion according to an embodiment of the present invention.

FIG. 2 is a top view showing a rotor in a step motor which is an essential part of the present invention.

[Explanation of symbols]

1 ... Step motor, 2 ... Stator, 3 ... Flange, 4 ... Screw, 5 ... Frame part, 6 ... Follower pin,
7 ... Magnetic head, 8 ... Carriage, 9 ... Lead screw, 10, 13 ... Rotating shaft, 11 ... Rotor, 12 ... Spindle motor.

Claims (1)

[Claims] 1. A magnetic head mounted on a carriage is rotatably driven by a spindle motor by a follower pin fixed to a carriage that abuts and slides on a groove of a lead screw formed on a rotary shaft of a step motor. In a floppy disk drive device provided with a magnetic head feeding mechanism configured to move in the media direction, the magnetic head is positioned at a fixed distance from the center of the spindle motor rotation axis, and in that case, the follower pin An initial adjustment method of a magnetic head position, characterized in that a rotation angle capable of being controlled by the step motor is regulated within a certain angle with respect to a position of a groove portion of the lead screw with which the abutment is made.