JPH08279260A - Disk driving device - Google Patents

Abstract

PURPOSE: To facilitate the structure and the assembling work of a motor shaft and to prevent the displacement thereof such as backlash from occurring by pressing the motor shaft toward a first bearing part. CONSTITUTION: A screw shaft is used also as the motor shaft 7 of a stepping motor 2 and the bearing 8 is set on a motor housing 2A side. Therefore, when the motor 2 is fitted to a fitting base 3, the bearing 8 is pressed to a second supporting part 3C and a flange part 6 integrated with the housing 2A is fixed to a motor housing supporting part 3A by using the pressing leaf spring 14 of an elastic member. Besides, since the shaft 7 is pressed to a first supporting member 3B side by a thrust spring 10A provided on the inside of a pressing member 10 arranged on the inside of the bottom surface of the housing 2A, the backlash thereof is eliminated. Therefore, the housing 2A and the shaft 7 can be easily rotated by a minute angle and the positioning of a reference track and a magnetic head 19 can be accurately and easily executed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk drive device such as a floppy disk drive device, and more particularly to a recording and / or reproducing head for recording and / or reproducing an information signal on a disk by a stepping motor. The present invention relates to a device having a head transfer mechanism to be operated.

[0002]

2. Description of the Related Art Conventionally, in a disk drive device for recording / reproducing information signals using a magnetic head on a floppy disk such as a micro floppy disk, a stepping motor is used to move the magnetic head along the radial direction of the disk. I am trying.

The stepping motor for moving and operating the magnetic head is mounted in the disk drive by fixing a mounting piece integrally provided on the motor housing of the stepping motor to the chassis.

A screw shaft for head transfer is connected to the motor shaft of the stepping motor by using a coupling or the like. The screw shaft is rotatably supported on the chassis by the bearings at the tip and the base.

And, in the screw part of the screw shaft,
A needle attached to a carriage that is movable with respect to a guide bar on which a magnetic head is mounted is pressed and brought into contact with the carriage. The head is sequentially transferred on each recording track along the radial direction of the micro floppy disk, for example.

By the way, in the case where the screw shaft is connected to the drive shaft of the stepping motor with such a structure, for example, the phase alignment for aligning the magnetic head and the reference track is performed by using a disc sheet for inspection. In carrying out the above, there is a problem that it is difficult to perform an operation for finely adjusting the screw shaft. This means that the screw shaft or motor body is completely loosened when loosening the coupling to adjust the rotation of the screw shaft, or when loosening the mounting part of the motor body to the chassis to adjust the rotation of the motor body as a whole. This is because it becomes difficult to adjust the rotation of a minute angle, and the adjustment must be performed by loosening the screw and the adjustment is difficult.

Further, unless the screw shaft and the guide bar for guiding the carriage on which the magnetic head is mounted are arranged precisely in parallel, the feed amount with respect to the rotation of the motor will be slightly different. become unable. For this reason, it is necessary to adjust the mounting position of the screw shaft, but if the adjustment amount becomes large, the coupling that connects the screw shaft and the motor drive shaft will not be able to absorb the deviation, and the mounting part of the motor body should also be loosened. It is necessary to adjust the mounting position of the motor body.

For this reason, Japanese Utility Model Publication No. 49-13867, Japanese Utility Model Publication No. 50-110616 and Japanese Utility Model Publication No. 58-4.
As disclosed in Japanese Patent No. 8071, a motor body is attached to a unit that indicates a screw shaft, and the unit is attached to a chassis of a disk drive device. With such a configuration, the position of the screw shaft is adjusted integrally with the motor main body, and it is not necessary to readjust the mounting of the motor main body.

However, in the above-mentioned publications, it is difficult to fix the motor main body to the shaft loosening unit of the screw shaft with high accuracy and at low cost so that the screw shaft and the motor shaft are completely parallel to each other. Further, since the screw shaft and the motor shaft can be adjusted so as to be completely parallel to each other, a coupling mechanism for absorbing an error between the screw shaft and the motor shaft is required.

By the way, the above-mentioned coupling mechanism is intended to absorb an error in the parallelism between the screw shaft and the motor shaft, but has some elastic deformation. Therefore, by interposing the coupling mechanism, the responsiveness of head feed is delayed, and the feed amount varies due to the deformation of the coupling mechanism. When such a change in the feed amount occurs, when the magnetic head is operated to feed, the stop positions may be deviated when the target recording track is fed from the outer circumference side and the inner circumference side of the disk. There is.

Therefore, in order to solve the problems caused by using the coupling mechanism as described above, the one constructed without using the above-mentioned coupling mechanism is the actual development 61.
-24861.

The publication described in this publication is such that a motor shaft is extended by an amount corresponding to a screw shaft, and a screw groove is formed in this extended portion. One end side and an intermediate part of the motor shaft are a bearing unit. The motor rotor part is attached to the other end side of the motor shaft, and the other end side of the motor shaft abuts the inner surface of the bottom plate of the motor body. In such a structure, the rotation center of the stator part of the motor and the rotation center of the rotor part may not necessarily coincide with each other, but conversely, the motor shaft and the screw may be located near the stator part and the rotor part. Since the average error of the shaft is absorbed, the coupling mechanism can be omitted and the screw driving characteristics can be improved.

[0013]

However, in the magnetic head transfer mechanism disclosed in Japanese Utility Model Laid-Open No. 61-24861, the screw shaft is moved toward the inner surface of the bottom plate of the motor body in order to remove the play of the bearing portion. The leaf spring for pressing is provided separately from the bearing unit for the screw shaft. Moreover, since the leaf spring and the bearing unit are fixed to separate chassis, the number of structural steps increases,
Further, the pressing force tends to vary, and when the pressing force is insufficient, backlash occurs. Therefore, it is necessary to strictly control the pressing force at the time of structure assembly, which makes it difficult to assemble the structure.

Therefore, the present invention solves such problems, makes it possible to carry out stable head transfer with a simple structure and assembly, and to easily align the reference track of the disk with the magnetic head. The present invention has been proposed for the purpose of providing a disk drive device.

[0015]

In order to achieve the above-mentioned object, a disk drive device according to the present invention has a head for scanning a disk-shaped recording medium and an engaging means, and the head is mounted on the head. A head moving means for moving the head in a radial direction of the disk-shaped recording medium, and a moving means for moving the head by engaging the engaging means with a screw groove formed in a motor shaft and rotating the motor shaft. Of the stepping motor for moving the motor, the motor housing of the stepping motor having a mounting portion on the front surface thereof, the first bearing portion supporting one end of the motor shaft, the first bearing portion and the motor housing. A second bearing portion that is in between and supports the intermediate portion of the motor shaft, and a motor housing support that supports the mounting portion of the motor housing And stepping motor support means having first and second bearing support portions that respectively support the first and second bearing portions, and the other end of the motor shaft serves as the first bearing portion. A pressing portion that presses toward the inside is provided inside the bottom surface portion of the motor housing.

In this disk drive device, the motor housing is supported on the motor housing, and the first and second bearing portions for supporting the motor shaft having the screw groove are supported on the first and second bearing support portions. By doing so, the stepping motor and the drive shaft of the stepping motor are positioned and fixed to the motor supporting means as an integral block.

The motor shaft having the screw shaft is placed in a state of being pressed and biased by the first bearing portion by the pressing portion provided inside the bottom surface portion of the motor housing.
Further, since the stepping motor is fixed to the stepping motor mounting base via the elastic member, the stepping motor is mounted on the motor mounting base in a state where elastic force is applied.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view showing a head transfer device according to the present invention, FIG. 2 is a side view thereof, and FIG. 3 is a sectional view seen from the side.

A head transfer device according to the present invention applied to a floppy disk drive will be described with reference to FIGS. 1 to 3. A motor mounting base for mounting a stepping motor 2 on a chassis 1 of the floppy disk drive. The base 3 is attached with screws 4. The motor mounting base 3 includes a motor housing support portion 3A and a first housing.
It is composed of a first support portion 3B that supports the bearing portion 12 and a second support portion 3C that supports the second bearing portion 8. The motor mounting base 3 is mounted on the chassis 1
The positioning is performed by the positioning pin 5 which is more planted.

The motor housing supporting portion 3A of the motor mounting base 3 supports the motor housing 2A of the stepping motor 2. That is, the flange portion 6 serving as an attachment portion to the motor housing support portion 3A is integrally attached to the front surface portion of the motor housing 2A of the stepping motor 2. The flange portion 6 is disposed on the front surface side of the main body of the stepping motor 2 into which a bearing 8 that serves as a second bearing portion that pivotally supports the intermediate portion of the motor shaft 7 of the stepping motor 2 is fitted.

A second supporting portion 3C is provided at the position of the motor housing supporting portion 3A corresponding to the motor shaft 7 of the stepping motor 2. The second support portion 3C supports the bearing 8 fitted in the flange portion 6, and the motor housing support portion 3 is provided.
It is formed as a coaxial fitting hole 13 on the outer circumference of the shaft hole 11 provided in A.

Next, the first support portion 3B provided on the motor mounting base 3 supports a metal bearing 12 which is a first bearing portion that pivotally supports one end of the motor shaft 7 of the stepping motor 2. It is a thing.

On the other hand, a screw groove 9 is formed on the outer periphery of the motor shaft 7 protruding from the motor housing 2A of the stepping motor 2. As described above, in the stepping motor 2, the motor shaft 7 also serves as a screw shaft.

Further, inside the bottom surface side of the motor housing 2A of the stepping motor 2, a pressing portion for preloading the motor shaft 7 is provided. This pressing portion is located inside the motor housing 2A of the pressing member 10 arranged on the bottom surface side of the motor housing 2A.
0A is arranged, the other end of the motor shaft 7 is pressed and supported by the thrust spring 10A, and the motor shaft 7 is pressed and biased toward the first support portion 3B.

In the stepping motor 2 thus constructed, the motor shaft 7 is inserted through the shaft hole 11 provided in the motor housing supporting portion 3A of the motor mounting base 3 and supported by the first supporting portion 3B. Metal bearing 12
The tip end of the motor shaft 7 is rotatably supported via the bearing 8, and the bearing 8 rotatably supporting the intermediate portion of the motor shaft 7 fitted in the flange portion 6 of the stepping motor 2 is the second support portion 3C. It is mounted on the motor mounting base 3 in a state of being fitted in the fitting hole 13. At the time of this attachment, the flange 6 is pressed down and the projection 14A
The pressing leaf spring 14 having the above is fastened to the mounting base 3 with a screw 15.

Further, a needle 18 mounted on a carriage 17 which is movable on a guide bar 16 disposed on the side of the mounting base 3 is provided with a screw groove 9 of the motor shaft 7.
Is in abutting engagement with. This enables the stepping motor 2
When the motor shaft 7 is driven at a predetermined angle, the magnetic head 19 mounted on the carriage 17 is sequentially moved on each recording track along the radial direction of the micro floppy disk, for example.

In the head feeding device constructed as described above, the screw shaft also serves as the motor shaft 7 of the stepping motor, and the bearing 8 as the second bearing portion is arranged on the motor housing 2A side of the stepping motor 2. Therefore, when mounting the stepping motor 2 on the mounting base 3, the bearing 8 is pressed against the second supporting portion 3C of the mounting base 3 to form a flange portion 6 integrated with the motor housing 2A of the stepping motor 2.
Is fixed to the motor housing support portion 3A by using a pressing leaf spring 14 which is an elastic member.

Therefore, for example, when the reference track of the disk and the magnetic head 19 are aligned by using a disk sheet for inspection, the stepping motor 2 not directly mounted on the motor housing supporting portion 3A of the mounting base 3 is used. Even if the motor portion of the stepping motor is rotated by loosening the screw 15, the motor housing 2A of the stepping motor 2 is pressed and supported by the holding plate spring 14 via the flange portion 6, so displacement such as wobbling is prevented. .

At this time, the motor shaft 7 is provided on the first support member 3B side by the thrust spring 10A arranged inside the pressing member 10 constituting the pressing portion arranged inside the bottom surface side of the motor housing 2A of the stepping motor 2. Since it is pressed and urged by, it does not rattle.

Therefore, in this state, the stepping motor 2
It becomes easy to rotate the motor housing 2A and the motor shaft 7 by a minute angle, and the positioning with the reference track can be performed with high accuracy and easily.

[0032]

As described above, in the disk drive device according to the present invention, the motor housing supporting portion supports the motor housing, and the first and second bearing portions for supporting the motor shaft having the screw groove are provided. The stepping motor and the drive shaft of the stepping motor are supported on the stepping motor mounting base by supporting the stepping motor by the first and second bearing supporting portions, and the chassis is formed as an integrated block via the stepping motor mounting base. Since it is positioned and fixed to the head, it is possible to prevent the head feed amount from varying due to the use of the coupling mechanism.

The motor shaft having the screw groove is configured to be pressed and urged toward the first bearing portion by the pressing portion provided inside the bottom surface of the motor housing. The pressing mechanism can be configured in the stepping motor, and the structural assembly becomes extremely easy.

Since the stepping motor, the drive shaft of the stepping motor, and the pressing portion for pressing the drive shaft are integrated into a common stepping motor mounting base, the pressing force of the drive shaft is increased. Since it can be attached to the chassis in the state of being attached, it is not necessary to adjust the pressing force when attaching to the chassis, and the assembly as a head feeding device becomes extremely easy.

Further, since the stepping motor is mounted by pressing and fixing the mounting member fixed to the front surface of the stepping motor main body to the motor mounting base using the elastic member, the elastic member is tightened. Even if the screws are loosened to allow the stepping motor body to rotate, the stepping motor body does not wobble, and the stepping motor body is rotated to rotate the motor shaft with the screw groove by a small angle. It is possible to easily perform the alignment with the reference track to be performed.

[Brief description of drawings]

FIG. 1 is a plan view of a disk drive device according to the present invention.

FIG. 2 is a side view showing a mounting state of a stepping motor of the disk drive device.

FIG. 3 is a cross-sectional view of a mounting state of the stepping motor as seen from a side.

[Explanation of reference numerals] 1 chassis, 2 stepping motor, 3 motor mounting base, 6 flange portion, 7 motor shaft, 9
Screw shaft, 10 pressing member, 14 pressing leaf spring, 16 guide bar, 17 carriage, 18
Needle, 19 magnetic head

Claims (1)

[Claims] 1. A head for scanning a disk-shaped recording medium, and an engaging means, and a head moving means for mounting the head, for moving the head in a radial direction of the disk-shaped recording medium, and the engagement. A stepping motor for moving the moving means toward the above by rotating the motor shaft by engaging the means with a screw groove formed in the motor shaft, and a motor housing of the stepping motor having a mounting portion on the front surface thereof. A first bearing portion that supports one end of the motor shaft, a second bearing portion that supports an intermediate portion of the motor shaft between the first bearing portion and the motor housing, and mounting of the motor housing. A motor housing supporting portion for supporting the first and second bearing portions, and first and second bearing supporting portions for respectively supporting the first and second bearing portions. And a stepping motor supporting means having the stepping motor supporting means, and a pressing portion for pressing the other end of the motor shaft toward the first bearing portion is provided inside a bottom surface portion of the motor housing. .