JPH0731418Y2 - Head transfer device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a head transfer device for transferring various types of heads such as magnetic heads.

[Conventional technology]

For example, a magnetic recording / reproducing apparatus is provided with a head transfer device that attaches a magnetic head to a support and transfers the support to position the magnetic head at a predetermined position.

In this type of magnetic recording / reproducing apparatus, in order to position the magnetic head at an arbitrary position on the magnetic disk, the magnetic head is supported by a transferable support, and the support is transferred in the radial direction of the magnetic disk. The mechanism was used. Then, as an example of a method of driving the support, on the side wall of the support, both ends of a steel belt wound around a pulley provided in the motor are fixed, and the steel belt is wound around the pulley by rotation of the motor, A mechanism for driving the transfer of the support is adopted. This type of steel belt is called α-winding, and the pulley and belt are fixed at one place. As for the shape of the steel belt, one side has one in the center, and the other side has two ends on both sides near the attachment part to the pulley. 1-2
Winding and both sides formed into a crank shape with bent parts 1-
Two kinds of one volume are known.

In any of the methods, the fixed portion with the pulley is formed wider than the other portion and is wound around the pulley.

[Problems to be solved by the invention]

By the way, in such a structure in which the steel belt is wound around the pulley to drive the support body, since the portion fixed to the pulley is formed wide, when the rotation angle of the pulley is increased, The inner surface of the belt may overlap with the end surface of the bent portion that forms the wide portion, and if the contact is repeated at the site, breakage may occur at the site. This accident may occur more frequently when a stepping motor to which force is applied intermittently is used.

In addition, in order to reduce inertia and improve rotation accuracy, when the diameter of the pulley is reduced, the radius of curvature is reduced and the outer surface of the steel belt wound around the pulley is stretched more than the inner surface, and the steel belt itself receives bending stress. It is in a state of It is also considered that the above-mentioned accident of breaking the steel belt occurs due to the repeated contact under the stress condition.

The present invention has been made in view of the above-mentioned problems, and an object thereof is to provide a head transfer device in which the steel belt is not likely to be broken even if the rotation angle is increased.

[Means for solving problems]

In order to achieve the above object, the present invention comprises a head, a support for the head, a pulley that is rotated by a rotary drive means, and a steel belt wound around the pulley and having both ends connected to the support. A head transfer device for driving the support by rotating a pulley to transfer a head, wherein a wide portion around which the steel belt is wound around the entire circumference of the pulley and both ends of the wide portion are provided. While being formed from a width ridge portion extending in the longitudinal direction,
The wide ridge portion is wound around the wide portion wound around the pulley so as to be always overlapped with the outer periphery of the wide portion.

[Action]

According to the above means, since the wide ridge portion overlaps the wide portion over the entire rotation range of the pulley, the contacting / separating operation occurs between the edge of the wide portion and the inner surface of the wide ridge portion. Not,
As a result, it is possible to prevent a steel belt from breaking due to fatigue caused by the contact between the two.

〔Example〕

The present invention will be described below based on its embodiment with reference to FIGS. 1 to 5.

FIG. 1 used to explain the embodiment is a perspective view showing the construction of the embodiment of the present invention, and FIG. 2 is a plan view showing a state in which the embodiment of the present invention is incorporated in a magnetic recording / reproducing apparatus. Is a plan view showing the shape of the steel belt used in the embodiment of the present invention, FIG. 4 is a perspective view of a main part showing the state of the pulley and the steel belt wound around the pulley, and FIG. 5 is the same plan view. is there.

This head transfer device includes a swing arm 17 as a support for supporting the read / write head 20, and a swing arm.
A stepping motor 11 for swinging 17, a pulley 13 fitted on a rotating shaft 12 of the stepping motor 11, and a pulley 13 wound around the pulley 13 and both ends of which are belt-holding at the base end of a swing arm 17. Steel belt 14 connected to body 21
It is mainly composed of and.

The swing arm 17 is formed in an arc shape as shown in the figure, and a read / write head 20 is mounted on one end of the swing arm 17 through a leaf spring 18, and a belt holder 21 and a read / write are mounted on the other end. It is provided with an IC 22 and is swingably supported by the support shaft 15.

As shown in FIG. 3, the steel belt 14 has strip-shaped first and second widthwise ridge portions 23 and 24 extending parallel to each other.
The first and second width ridges are provided at substantially the central position in the longitudinal direction.
Each end of 23 and 24 is bent in a crank shape, and a wide portion 25 is formed in this bent portion. First width ridge
A fixing hole 26 is formed at the other end of 23, and an engaging hole 27 is formed at the other end of the second width ridge portion 24.

The length 1 of the wide portion 25 in the longitudinal direction of the steel belt 14 is set to be slightly shorter than the circumference of the pulley 13. As shown in FIGS. 4 and 5, the wide portion 25 is wound around the pulley 13 over substantially the entire circumference thereof, and the portion of the pulley 13 facing each other with a minute gap d on the circumferential surface of the pulley 13. A wide portion 25 is fixed to the pulley 13 by means of spot welding, for example, at portions facing each other across the center of the. In this way, the first width ridge portion 23 and the second width ridge portion 24 are always superposed on the wide width portion 25, and in this superposition state, the first width ridge portion 23 has the fixing hole 26 portion. Is fixed to the belt holding body 21 by means of screws 28, and the second width ridge portion 24 is engaged with the belt holding body 21 by means of the engagement hole 27. Also this steel belt
In the winding state of 14 around the pulley 13, the steel belt 14 is provided with a stretching force of about 600 g by the leaf spring 21a.

As described above, the steel belt 14 is wound around the pulley 13, and the pulley 13 is rotated by the stepping motor 11. When the stepping motor 11 is rotated by one step, in the embodiment, The rotary shaft 12 rotates 0.45 °, and the steel belt 14 is wound around the pulley 13 by this rotation, the support 16 is rotated about the rotary shaft 15 by this winding, and the read / write head 20 is rotated. It is configured to be transferred to a predetermined position.

FIG. 2 shows a state in which the embodiment of the present invention is incorporated in a magnetic recording / reproducing apparatus. A magnetic disk 30 is housed in a substantially box-shaped housing 29, and the magnetic disk 30 is rotated by a spindle motor 31. It is rotatably arranged around the heart.

At a position adjacent to the magnetic disk 30 of the housing 29, the stepping motor 11 having the above-described structure and the swing arm are arranged.
17 and a steel belt 14 wound around a pulley 13 attached to a rotary shaft 12 of a stepping motor 11 and having both ends fixed to a belt holder 21 are housed. The read / write head 20 fixed to the tip of the leaf spring 18 attached to the swing arm 17 is located at the winding end position of the pulley 13 in the counterclockwise direction in the drawing, and is located on the outer peripheral portion of the magnetic disk 30. .

The operation of the case where the embodiment of the present invention having the above-mentioned structure is applied to the magnetic recording / reproducing apparatus will be described.

The read / write head 20 is
Almost 10g in the shipping zone on the inner circumference side of the magnetic disk 30
They are in contact with each other. When the device is activated and the magnetic disk 30 starts to rotate, the air on the surface of the magnetic disk 30 rotates together with the magnetic disk 30, and the read / write head 20
Air flows between the slider supporting the magnetic disk 30 and the read / write head 20 from above the surface of the magnetic disk 30.
It floats about 0.3 μm.

When the read / write head 20 is in a floating state, the stepping motor 11 is driven, and the read / write head 20 is rotated by a predetermined angle to move the read / write head 20 to the magnetic disk 30.
Is positioned at a track having a predetermined radial position, and information is recorded / reproduced.

When the recording / playback of information at the track position is completed,
The stepping motor 11 is rotated by a predetermined angle to the next step, information is recorded / reproduced at the next track position, and the same operation is sequentially performed.

As described above, according to the above embodiment, the following effects can be obtained.

During the recording / reproducing operation of information, the wide portion 25 of the steel belt 14 is wound around substantially the entire circumference of the pulley 13, and the first and second narrow ridge portions 23 and 24 are always superposed on the wide portion 25. Then, the steel belt 14 is wound around the pulley 13. Therefore, from the peripheral surface of the pulley 13 to the surface of the first and second widthwise ridge portions 23 and 24 which are wound or unwound on the peripheral surface and are moved at the same distance, a stable steel belt is provided. 14 transfers are made.

Since the edge portions of the first and second width ridge portions 23 and 24 do not come into contact with other portions of the steel belt 14 during the transfer, the steel belt 14 is not damaged and the operating life is greatly extended.

Since the wide portion 25 is spot-welded to the peripheral surface of the pulley 13, torque is not generated in the rotation axis direction with respect to the pulley 13 when the support body 16 is driven, as compared with the case where the support body 16 is screwed. The drive torque is stable.

Even if the rotation angle of the pulley is large, the width ridge portions 23 and 24 are always in contact with the outer surface of the wide portion 25, and thus the overlapped state is provided.
No operation error or malfunction will occur.

Since the head transfer device of the present invention is applicable to various heads, various magnetic recording / reproducing devices such as a perpendicular recording type magnetic recording / reproducing device and other optical heads are not limited to those shown in the embodiments. As a result, it can be applied to a recording / reproducing device for an optical disk memory.

[Effect of device]

As described in detail above, according to the present invention, it is possible to provide a head transfer device capable of setting the rotation angle of the pulley to a large value, preventing the steel belt from being cut, and achieving miniaturization. .

[Brief description of drawings]

FIG. 1 is a perspective view showing a configuration of an embodiment of the present invention, FIG. 2 is a plan view showing a state in which the embodiment of the present invention is incorporated in a magnetic recording / reproducing apparatus, and FIG. 3 is an embodiment of the present invention. FIG. 4 is a plan view showing the shape of a steel belt used, FIG. 4 is a perspective view of a main part showing a state of a pulley and a steel belt wound around the pulley, and FIG. 5 is a plan view of the same. 11 …… Stepping motor, 13 …… Pulley, 14 …… Steel belt, 17 …… Swing arm, 18 …… Leaf spring, 20
...... Read write head, 23 ...... First width ridge, 24 ......
Second wide ridge, 25 ... Wide part, 29 ... Housing, 30 ...
… Magnetic disk, 31… Spindle motor.

Claims (1)

[Scope of utility model registration request] 1. A head, a support for the head, a pulley which is rotated by a rotation driving means, and a steel belt which is wound around the pulley and whose both ends are connected to the support.
In a head transfer device that drives the support to transfer a head by rotating a pulley, a wide portion around which the steel belt is wound around substantially the entire circumference of the pulley, and a longitudinal direction from both ends of the wide portion. It is formed of a wide ridge portion that extends to the outer side of the wide ridge portion, and the wide ridge portion is always contacted with the outer surface of the wide portion wound around the pulley, and the wide ridge portion is wound so as to be superposed on the wide portion. Head transfer device.