JPS6251076A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To reduce guide shafts requiring a working accuracy and lower a cost by guiding a magnetic head movable carriage by one guide shaft. CONSTITUTION:When recording or reproducing a magnetic disk 13 mounted on a turn table 14, a pinion 3 is driven on a movable carriage 1 in the direction shown by an arrow X by a rotation of a motor 4, and a magnetic head 2 moves to a position opposed to a desired recording track. When moving the magnetic head 2, the movable carriage 1 made of PSS resin of a small friction factor horizontally smoothly moves because a sliding part 1c slides on a guide rail 5 with a low friction and a ball 16 rolls on a chassis 6. Since the movable carriage 1 is compact size and light weight, a burden of the motor 4 is reduced and it rapidly and stably moves. Since the movable carriage 1 is turned and energized making the guide rail 5 a turning fulcrum by a spring 18, no adjustment in engagement state of a rack 1a and the pinion 3 during assembling is required.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a magnetic disk drive, and more particularly to a magnetic disk drive configured such that a magnetic head moving table having a magnetic head is guided by a single guide shaft.

Conventional technology Conventionally, in a magnetic disk device, the drive method for driving the magnetic head moving table that controls the magnetic head includes, for example: ■ A steel belt is attached to the magnetic head moving table, and the steel belt is wound up by a drive motor to generate magnetic information. A steel belt type that moves the head moving table.■The lead screw is rotationally driven by a stepping motor.
A feed screw type in which the magnetic head moving table is moved via a needle or ball that engages with a lead screw;
(2) There is a cam type in which a part of the magnetic head moving table is fully engaged with the cam of the cam, and the cam is rotationally driven by a stepping motor to move the magnetic head moving table. In each of these driving methods (1), (2), and (2), the magnetic head moving table is guided and moved by two parallel guide shafts.

Problems to be Solved by the Invention However, in the above-mentioned conventional magnetic disk drive, since the magnetic head moving stage is guided by two parallel guide shafts, two parallel guide shafts are used.
It is necessary to maintain the parallelism of the guide shaft of the book with high precision, and it takes time and effort to make the machining degree of the guide shaft highly accurate, and to adjust the assembly position when assembling the guide shaft in the position f4. There were some drawbacks. Furthermore, conventional equipment requires two expensive guide shafts that require high viscosity. It had the disadvantage that it was correspondingly more expensive.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a magnetic disk device that eliminates the above-mentioned drawbacks.

Means for Solving the Problems The present invention provides a magnetic head moving table having a magnetic head for recording/reproducing a magnetic disk and a rack meshing with a gear of a drive motor, and a magnetic head moving table for guiding the magnetic head moving table in the radial direction of the magnetic disk. It consists of a one-piece wooden guide shaft, and an urging means for rotating and urging the magnetic head moving table using the guide shaft as a rotational fulcrum to maintain the engaged state between the rack and the gear. In addition to guiding the movable table, the guide shaft functions as a rotation fulcrum when the rack is engaged with the gear.

Embodiment FIGS. 1 and 2 are a plan view and a side view of an embodiment of a magnetic disk device according to the present invention. In both figures, a magnetic head moving table 1 has a rack 1a on its side and is integrally molded from polyphenylene sulfide resin (hereinafter referred to as PPS resin), and a magnetic head 2 is mounted and fixed on the tip of an arm portion 1b. ing. In addition, this PPS resin has excellent affinity, so by adjusting the blending ratio of carbon fiber, glass fiber H, etc., Ii! The coefficient of expansion can be changed and is made to be approximately the same as the coefficient of linear expansion of a flexible magnetic disk made of polynisdel or the like. In addition, PPS resin has high hardness and excellent wear resistance, so it can be used for gears.
However, because the coefficient of friction is low, r! l It can be used in bearing parts because it has reduced frictional resistance and excellent sliding properties, and it has excellent moldability and can produce high-precision parts by injection molding. Suitable for use with precision equipment such as disk drives.

Numeral 3 denotes a pinion that meshes with the rack 1a and is mounted on the rotating shaft 4a of the stepping motor 4. 5 is a round bar-shaped guide rail (guide shaft), and both ends are attached to the chassis 6.
A leaf spring 8 fixed on the support base 7 in the recess of the upper support base 7
It is energized by the repulsive force of , and is suppressed and fixed, and this is 1! ! ! It is inserted so that it can be moved.

That is, there is one moving table 1, which is guided in the radial direction of the magnetic disk 13 by the idle rail 5, and has 43 motors.
is driven to move in the direction of arrow X.

Furthermore, since the guide rail 5 guides the movement of the magnetic head 2, it requires high machining and assembly accuracy, but since only one guide rail 5 is provided, assembly is easy, and the impact on manufacturing costs is reduced. . Furthermore, since the installation space is reduced due to the small number of guide rails 5, it is possible to reduce the size of the unit.

9 is a presser pad, and an arm 10 facing the magnetic head 2
is fixed to the tip of. The arm 10 is rotatably supported by a rotation shaft 11 on the movable table 1, and is biased in the direction of the arrow by the elastic force of a torsion spring 12. Therefore, the presser pad 9 brings the flexible magnetic disk 13 into contact with the magnetic head 2 by the elastic force of the John spring 12. Reference numeral 14 denotes a turntable on which the magnetic disk 13 is placed, and is driven by a turntable drive motor 15 fixed to the lower side of the chassis 6.

As shown in FIG. 3, a through hole 1d is bored in the movable table 1 on the opposite side of the mounting hole 1a. A stainless steel ball 16, a ball holder 17 that presses the ball 16, and a coil spring 18 that presses the ball 16 and the ball holder 17 downward are housed in the through hole 1d. A spring stopper plate 19 is screwed above the through hole 1d to prevent the spring 18 from coming loose.

When recording or reproducing information on the magnetic disk 13 placed on the turntable 14, the rotation of the motor 4 causes the pinion 3 to drive the movable table 1 in the direction of the arrow X, and the magnetic head 2
is moved to a position opposite to the desired recording track. Note that when moving the magnetic head 2, PP, which has a small coefficient of friction,
The moving table 1 made of S resin has a sliding portion 1C that slides on the guide rail 5 with low friction, and the ball 16 rolls on the chassis 6, so that it moves smoothly in a horizontal state. In addition, mobile platform 1
Since it is small and lightweight, the load on the motor 4 is reduced and it moves quickly and stably.

Note that since the spring 18 that presses the ball 16 against the chassis 6 presses the spring stopper plate 19 upward, the movable base 1 is rotated in the direction of arrow B using the guide rail 5 as a rotation fulcrum, and the rack 1a is is pressed toward the pinion 3 side, thereby stabilizing the meshing state between the rack 1a and the pinion 3. Therefore, the movable table 1 sliding on the guide rail 5 moves in the radial direction of the magnetic disk 13 in a stable state. Therefore, when the movable table 1 moves while being guided by one guide rail 5, the magnetic head 2 moves while being guided in the radial direction of the magnetic disk 13, and records/reproduces data on/from the magnetic disk 13 well.

In addition, since the movable table 1 is rotated by the spring 18 with the guide rail 5 as a rotation fulcrum, the rack 1a is
There is no need to adjust the meshing state between the pinion 3 and the pinion 3. In addition, there is no risk that the assembly accuracy between the rack 1a and the pinion 3 will decrease, and the rotational driving force of the motor 4 is always applied to the movable base 1.
is transmitted to.

When the magnetic head 2 reaches a position facing a desired recording track by the movement of the movable table 1, the rotation of the motor 4 and the pinion 3 is stopped, and the movable table 1 is stopped in the meshing relationship between the rack 1a and the pinion 3. Ru.

When stopped, the moving table 1 has a reduced W1 force due to its weight reduction, and stops accurately at a predetermined stop position. In addition, since PPS resin has old hardness and excellent wear resistance, the rack part 1a
It has sufficient strength and will not be damaged by impact when stopped.

Further, when the presser pad 9 brings the magnetic disk 13 into contact with the magnetic head 2 due to the elastic force of the spring 12, the magnetic head 2
is in sliding contact with the track on the magnetic disk 13 rotated by the turntable drive motor 15 to perform recording or reproduction.

Although the above description has been made using a flexible magnetic disk, the present invention is not limited to this, and can of course be applied to devices that use hard magnetic disks.

Effects of the Invention As described above, the magnetic disk device according to the present invention guides the magnetic head moving table using one guide shaft, so compared to conventional devices, the number of guide shafts that require high processing accuracy can be reduced. Therefore, unlike the conventional device, the parallelism of the two guide shafts does not become a problem, and not only no labor is required before assembly, but the manufacturing costs 1 to 1 can be further reduced. Furthermore, since the number of guide shafts is reduced, the installation space is smaller than that of conventional devices, and the device can be made smaller. In addition, since the rack of the movable platform is engaged with the gear of the drive motor by rotationally biasing the guide shaft as a rotation fulcrum, there is no need for adjustment during assembly, and the meshing state of the rack and gear is always maintained. It is well-maintained, and has features such as being able to move the magnetic head stably and with high precision even with a single guide shaft.

[Brief explanation of the drawing]

FIGS. 1 and 2 are a plan view and a side view of an embodiment of the magnetic disk storage according to the present invention, and FIG. 3 is a sectional view showing the main parts of a moving table. 1...Magnetic head moving table, 1a...Rack, 1b.
...Arm part, 1C...Sliding part, 2...Magnetic head, 3
...Binion, 4...Stepping motor, 5...
- Guide rail, 9... Presser pad, 10... Arm, 13... Magnetic disk, 14... Turntable, 15... Turntable drive motor, 16...
Ball, 17...Ball holder, 18...Coil spring.

Claims (1)

[Claims] A magnetic head moving table having a magnetic head for recording/reproducing a magnetic disk and a rack meshing with a gear of a drive motor; a guide shaft for guiding the magnetic head moving table in a radial direction of the magnetic disk; 1. A magnetic disk drive comprising: urging means for rotationally urging the magnetic head moving table using the guide shaft as a rotational fulcrum so as to maintain a meshing state between the rack and the gear.