JPS6342071A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To improve the positioning precision of a magnetic head by rotating a guide rod, which supports a carrier and controls movement of this carrier which moves and holds the magnetic head, around the axis to reduce the friction between the guide rod and the carrier. CONSTITUTION:A pulley 5 is rotated as one body together with a spindle shaft 4, and a guide rod 3b is rotated through a cam belt 6 wound around the pulley 5 and a guide rod 3b. When the guide rod 3b is rotated, the friction caused between the guide rod 3b and a supporting hole 2b is dynamic, and this frictional force is very weaker than the static frictional force caused in case of non-rotation of the guide rod 3b. Thus, the friction caused between the guide rod and the supporting hole 2b is reduced to improve the positioning precision of the magnetic head.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic disk device, and particularly to the structure of a magnetic disk device used as an external storage device of a computer.

[Prior Art] Conventionally, this type of magnetic disk device has a magnetic head that inputs information to a magnetic disk to be inserted, a receiver formed at the front and rear of a carrier, and a support hole that fits into the support hole. The magnetic head is supported by two guide rods mounted thereon, and is provided with a carrier that moves and holds the magnetic head to a predetermined track on the magnetic disk by the force of a positioner. By suppressing the gap between the guide rod and the support hole of the carrier to a few microns, the magnetic head is positioned while suppressing minute displacements of the magnetic head from a predetermined track due to the gap.

[Points to be solved] Regarding the conventional magnetic disk drive described above, the gap between the guide rod and the hole provided in the carrier for supporting the guide rod is kept to several microns, and the predetermined gap between the magnetic head is Because the tiny position from the track is held down, when trying to move the magnetic head to a predetermined track using a positioner (step motors are widely used), the amount of friction in the gap of several microns becomes so large that it cannot be ignored. , there is a difference in the position of the magnetic head when positioning to a predetermined track from the direction of arrow A in FIG. 1 and when positioning from the direction of arrow B, which has the disadvantage that accurate writing and reading of information cannot be performed.

[Means for Solving Problems] The present invention has been made by focusing on the above-mentioned conventional problems, and reduces the friction generated between the guide rod and the hole for supporting the guide rod provided in the carrier. It is an object of the present invention to provide a magnetic disk device that can improve the accuracy of positioning a magnetic head.

To this end, the present invention provides a magnetic disk drive including a carrier that moves and holds a magnetic head on a predetermined track of a magnetic disk by the force of a positioner, and a guide rod that supports the carrier and regulates the movement in a predetermined direction. The present invention provides a magnetic disk device characterized in that a rotating means for rotating a guide rod around its axis is provided.

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

FIG. 1 is a perspective view showing a main part of an embodiment of a magnetic disk device according to the present invention, and FIG. 2 is a perspective view showing an embodiment of a rotating means applied to the main part. .

The magnetic disk device includes a magnetic head 1, a carrier 2 that holds the magnetic head, guide rods 3a and 3b that support the carrier 2 and regulate its movement, a spindle shaft 4 that rotates the magnetic disk, and a carrier 2 that supports the carrier 2 and regulates its movement. It comprises a pulley 5 provided on a spindle shaft 4, and a cam belt 6 wound around the pulley 5 and a guide rod 3b.

The magnetic head 1 is provided at a predetermined location on the carrier 2, and has the function of writing information on or reading information from a magnetic disk (not shown) inserted therebetween.

The carrier 2 has a receiving portion 2a at approximately the center of the front surface as seen from the figure,
It has a support hole 2b with a circular cross section that penetrates laterally at the rear,
The receiver is supported slidably in the rod direction by guide rods 3a and 3b fitted in the portion 2a and the support hole 2b, respectively. Further, the carrier 2 has a function of moving and holding the magnetic head 1 to a predetermined track on the magnetic disk by the force of a positioner (not shown) using a step motor attached to the carrier 2.

The guide rods 3a and 3b are rod-shaped with a circular cross section, and the receivers of the carrier 2 are fitted into the support holes 2a and 2b of the carrier 2, respectively.
It has the function of holding it horizontally and regulating its movement. The guide rod 3b has a diameter such that the gap between it and the support hole 2b is kept to a few microns, and as shown in FIG. 2, one side of the guide rod 3b is close to the spindle shaft 4, and the end is held by a bearing (not shown). , it is rotatable around its axis.

The spindle shaft 4 located close to the guide rod 3b is
It has the function of rotating the magnetic disk by its rotational force, and is arranged in a twisted position perpendicular to the guide rod 3b.

The pulley 5 is provided on the spindle shaft 4, fixed at a position facing the guide rod 3b, and rotates together with the spindle shaft 4.

The cam belt 6 is wound around the pulley 5 and the guide rod 3b in a Möbius ring shape, and transfers the rotational force of the spindle shaft 4 to the pulley 5.
It has a function of transmitting power to the guide rod 3b via the guide rod 3b.

Next, the operation of this embodiment will be explained.

A pulley 5 rotates together with the spindle shaft 4, and a guide rod 3b rotates via a cam belt 6 wound around the pulley 5 and the guide rod 3b.

When the guide rod 3b is in a rotating state, the guide rod 3b
The friction generated between the guide rod 3b and the support hole 2b becomes a dynamic friction state, and the friction force is extremely small compared to the static friction force that occurs when the guide rod 3b is not rotating.

At this time, the magnetic head 1 is moved to a predetermined track on the magnetic disk to position the magnetic head 1.

In this embodiment, a pulley is provided on the spindle shaft, and a rotation means is adopted in which the rotational force of the spindle shaft is transmitted to the guide rod via a cam belt wound around the pulley and the guide rod, but this is not limitative. Alternatively, for example, a pulley may be provided on the guide rod, a cam belt may be wound around the pulley and the spindle shaft, and the rotation of the spindle shaft may be transmitted to the guide rod via the cam belt. It is also possible to adopt a configuration in which two bevel gears that mesh with each other are inserted into the spindle shaft and the guide rod to transmit the rotational force of the spindle shaft to the guide rod, without using a pulley or a cam belt. Furthermore, it is also possible to directly attach a motor or the like to the guide rod and rotate it without using the rotational force of the spindle shaft. That is, a rotating means for applying rotational force to the guide rod may be provided, and the friction force generated between the guide rod and the carrier may be brought into a dynamic friction state.

[Effects of the Invention] As explained above, the present invention provides a guide rod that supports and restricts the movement of a carrier that moves and holds a magnetic head on a predetermined track of a magnetic disk by the force of a positioner.
Since the magnetic disk device is equipped with a rotating means for rotating the guide rod around its axis, the friction between the guide rod and the carrier can be reduced to a dynamic friction state, which has the effect of increasing the accuracy of positioning the magnetic head.

[Brief explanation of drawings]

FIG. 1 is a perspective view of the main parts of a magnetic disk device according to an embodiment of the present invention, and FIG. 2 is a perspective view showing an embodiment of a rotating means provided in the magnetic disk device of the present invention. be. 1: Magnetic head 2: Carrier 2a: Support part 2b: Support hole 3a, 3b guide rod 4 spindle shaft 5: pulley 6: cam belt

Claims (1)

[Claims] A magnetic disk device including a carrier that moves and holds a magnetic head in a predetermined track of a magnetic disk by the force of a positioner, and a guide rod that supports the carrier and regulates movement in a predetermined direction, the guide rod being aligned with its axis. What is claimed is: 1. A magnetic disk device comprising a rotating means for rotating the disk around the disk.