JPS61160881A - Magnetic head shifting device - Google Patents

Abstract

PURPOSE:To attain the highly accurate actuation of a magnetic head by providing a support part containing a pair of U-shaped grooves at both ends of a mobile base, fixing a metallic pipe into these grooves together with the bearings fixed at both ends of the pipe and shifting the magnetic head a guide rod put into those bearings. CONSTITUTION:A pipe 5 into which bearings 3a and 3b are pressed at both ends of the pipe is fixed into a pair of U-shaped grooves 2 of a mobile base 1 by means of an adhesive, etc. A guide rod 4 is put into the bearings 3a and 3b. Then a magnetic head 9 is shifted on the surface of a flexible disk 10 by the sliding actions of the rod 4 and in response to the rotational frequency of a drive motor 6.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic head moving device in a flexible disk (hereinafter referred to as floppy disk) storage device.

[Conventional technology]

In the currently widely used floppy storage devices, the magnetic head must be precisely and precisely aligned with the center of rotation of the floppy in order to ensure compatibility between floppies and between floppy storage devices. It has been demanded.

FIG. 4 is a configuration diagram showing a conventional magnetic head moving device. In the figure, (1) is a moving base, which is mainly made of engineering plastic material made by precision injection molding, etc., and the holes (2) at both ends are filled with Teflon, pps, or sintered oil-impregnated material with excellent self-lubricating properties. A bearing (3) made of an alloy or the like is fixed by bonding or press-fitting with an adhesive or the like, and a guide rod (4) is fitted into the bearing (3) to slide therein.

(6) is a drive motor, and a screw piece (
8), the magnetic head (9) is moved to a position corresponding to the flexible tilt according to the rotational speed of the drive motor (6).

Figure 5 is a cross-sectional view taken along line B-B in Figure 4, and shows the movable base (1
Strict tolerances are set for the accuracy of the holes (2 m) and (2b) at both ends of the holes (2 m) and (2b), that is, the dimensions of the inner diameter, the roundness, and the coaxiality of both holes (2 m) and (2 b). ing. In addition, from the perspective of mass production effectiveness, a mobile base (1
) is expensive to form from a metal material, so we selected an enduary/double plastic material with relatively low heat shrinkage deformation and used precision injection molding to create a low-cost mobile base (
1) However, with normal precision injection molding, the inner diameter dimensions of the holes (2 m) and (2b), the coaxiality of these holes, etc. cannot be achieved to the precision level of machine-cut products. For this reason, complicated and special precision injection molds are used, or holes at both ends (2
m), (2b) is machined and processed,
Products are manufactured that can satisfy the predetermined inner diameter dimensions, roundness, and coaxiality accuracy.

[Problem that the invention seeks to solve]

In the conventional magnetic head moving device as described above, bearings (3ml, (3bl) are attached to the moving base (1) obtained by injection molding of plastic without machining to create a high-precision product. requires expensive injection molding molds with complex and specific characteristics, and pigeonholes molded with ordinary molds without such expensive molds require machining after injection molding. These methods pose a difficult problem in terms of reducing the cost of the product because they require a certain degree of precision.

This invention was made to solve these problems, and it is possible to install bearings without using a special and expensive injection mold for the movable base or without machining after molding. It is an object of the present invention to provide a magnetic head moving device that slides on a guide rod and obtains highly accurate movement.

[Means for solving problems]

A magnetic head moving device according to the present invention includes a support portion having a pair of U-shaped grooves at both ends of the above-mentioned moving base.
A metal pipe is fixed to the groove by adhesive, etc., bearings are fixed to both ends of this pipe by press-fitting, etc., and the magnetic head is moved on the flexible disk surface along the guide rod fitted into the bearing. It is something that makes you

[Effect]

Since the metal pipe is fixed to the U-shaped grooves provided at both ends of the moving base, the forming precision of the U-shaped grooves, especially the coaxiality, is not required to be exact. The bearing and guide rod fit together with high precision coaxiality.

〔Example〕

FIG. 1 is a block diagram showing an embodiment of the present invention, and the diagram shows (1), (3), (4). Hi (6) ~
(11 is the same part as the one with the same symbol in the conventional example shown in FIG. 4, (2) is a pair of U-shaped grooves shown in the perspective view of FIG. - It is a pipe showing the A cross section, bearings (3m), (3b
) are press-fitted into both ends of the inner diameter of this pipe (5), and the outer diameter parts are formed into U-shaped grooves (2a) and (2b) of the moving base (1).
and is fixed with adhesive etc. This pipe (5)
is made of metal formed by precision drawing, precision extrusion, or precision machining, so the inner diameter of the hole is, for example, ψ40.0041111. Roundness is ±0.002
(2) High precision parts with coaxiality of ±0.005/4Cm can be obtained.

Therefore, the U-shaped groove (2 ml,
(2b) The kite rod (
4) and the bearings (3m) and (3b) for smooth fitting and sliding action, the movable base (1) is moved with high precision.

〔Effect of the invention〕

As explained above, the pipe (5) can be produced in a simple cylindrical shape that is suitable for mass production, so it can be obtained at low cost. By changing the conventional round hole to a U-shaped groove, the mold for forming the movable base (1) can be of a simple configuration consisting of only an upper mold and a lower mold, allowing highly accurate and inexpensive magnetic head movement. There is an effect that the device can obtain.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of a magnetic head moving device showing an embodiment of the present invention, FIG. 2 is a perspective view showing the main parts of FIG. 1, #J6
The drawings are a cross-sectional view taken along the line AA in FIG. 1, FIG. 4 is a block diagram showing a conventional magnetic head moving device, and FIG. 5 is a cross-sectional view taken along the line B-B in FIG. 4. In the figure, (1) is a moving base, (2) is a hole, and (3a)
. (6b) is a bearing, (4) is a guide rod, (5) is a pipe,
(6) is the drive motor, (7) is the screw, (8) is the screw piece,
(9) is a magnetic head, and (2) is a flexible tissue. Note that the same symbols in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] A magnetic head and a flexible disc whose surface is formed of a magnetic medium are in contact with each other, and electrical signal information is recorded on the magnetic medium by electromagnetic conversion, or magnetic signals of the magnetic medium are recorded. In a flexible disk storage device that reproduces electrical signals, a metal pipe is fixed to a pair of U-shaped grooves formed at both ends of a movable base on which the magnetic head is fixed, and a metal pipe is fixed to a pair of U-shaped grooves formed at both ends of the movable base to which the magnetic head is fixed. A magnetic head moving device, wherein the magnetic head moves on the flexible disk along a fitting guide rod.