JPS62257677A - Swing arm type read/write head - Google Patents

Abstract

PURPOSE:To improve the positioning accuracy by providing a pressing member energized radilly toward a bearing in the inside of a shaft fitted into the bearing and providing a notch to a side of the shaft at the opposite side to the projecting position of the pressing member. CONSTITUTION:The load by plungers 8, 9 is given uniformly radially with distribution to ball bearings 4, 5 from tangential parts A, B and a tip C to press the ball bearings 4, 5 and a fixed shaft 7. Further, the load by a spring waster 10 pressed by a pressure adjusting screw 11 is given axially to the upper face of the inner race of the ball bearing 4, and a load is given axially from the step face of the housing 6 or the fixed shaft 7 to the lower face of the outer race of the ball bearing 4, the upper face of the outer race of the ball bearing 5 and the lower face of the inner race. Thus, the ball bearings 4, 5 are pressed and deformed, the rigidity of balls 12, 13 in the ball bearings 4, 5is increased, the ball bearings 4, 5 and the fixed shaft are subjected to press fit, and the rigidity of the balls in the ball bearings 4, 5 is increased, then the arm 3 hardly receives the effect of vibration.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a swing arm type read/write head, and particularly to an arm support structure.

[Conventional technology]

A servo track writer for hard disks has a servo head attached to an arm rotatably supported by a fixed shaft via a ball bearing, and the rotation of the arm moves the servo head in an arc shape on the hard disk. There are devices that position a servo head relative to a hard disk.

[Problem that the invention seeks to solve]

By the way, in the servo head of such a servo track writer, (1) there is play between the ball bearing and the fixed shaft at the arm support location due to machining and installation reasons; (2) the shaft of the ball bearing There has been a problem in that the arm is susceptible to vibrations due to its low rigidity in the direction, which often results in poor positioning accuracy.

This invention has been made in view of the above-mentioned points, and is generally applicable to read/write heads (read/write heads) attached to an arm rotatably supported via a bearing.
The purpose of this is to improve the positioning accuracy of a swing arm type read/write head.

[Means for solving problems]

One of the inventions is to provide a swing arm type read/write head with a pressing member that is biased radially toward the bearing inside the shaft inserted into the bearing, and to adjust the protruding position of the pressing member. The invention is characterized in that a notch is provided on the side surface of the shaft on the opposite side.

Another aspect of the present invention is a swing arm type read/write head, in which a first pressing member is provided inside a shaft inserted into the bearing and is biased in the radial direction toward the bearing. The present invention is characterized in that a notch is provided in the side surface of the shaft opposite to the protruding position of the pressing member, and that a second pressing member is provided that presses and deforms the bearing in the axial direction.

[Effect]

The load by the pressing member (first pressing member) is applied to the bearing in a distributed manner from the tip of the pressing member and the tangent between the notch surface and the side surface of the shaft. With this load,
The bearing and shaft are crimped together despite the presence of play, so
The arm is less susceptible to vibrations, and head positioning accuracy is improved.

Furthermore, if a second pressing member is also provided, the rigidity of the bearing increases as the bearing deforms under pressure in the axial direction, making the arm even less susceptible to vibrations.
The positioning accuracy of the head can be further improved.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows an embodiment of a swing arm type read/write head according to the present invention. 1 is a servo head of a servo track writer for a hard disk, 2 is a hard disk mounted on a spindle (not shown), and 6 is an arm to which the servo head 1 is attached. The arm 3 is rotatably supported on a fixed shaft 7 via two ball bearings 4 and 5 and a housing 6 of the ball bearing, and is rotated around the fixed shaft 7 by a driving means (not shown). The servo head 1 is positioned with respect to the disk 2.

Two plungers 8 and 9 are provided inside the fixed shaft 7 and are biased in the radial direction toward the ball bearings 4 and 5.

A notch 7a is provided on the opposite side of the fixed shaft 70 from the protruding position of the plunger 8.9.

7b is provided. These notches 7a, 7b are the second
As shown for the notch 7a in the figure, the shape formed by connecting tangent points A and B between the notch surface and the side surface of the fixed shaft 7, and the tip portions C of the corresponding plungers 8 and 9 (indicated by broken lines) is the shaft. It is provided so as to form a substantially isosceles triangle when viewed from the direction.

Of the ball bearings 4 and 5, the lower surface of the outer race of the ball bearing 4 located above is in contact with the stepped surface of the housing B, and the upper surface of the outer race and the lower surface of the inner race of the ball bearing 5 located below are in contact with the stepped surface of the housing B. The step surface of the fixed shaft 7 is in contact with the step surface of the fixed shaft 7.

At a position above the ball bearing 4 on the fixed shaft 7, a spring washer 10 and a pressure adjustment screw 11 for pressurizing the spring washer 10 downward in the axial direction are attached. The lower surface of the spring washer 10 is in contact with the upper surface of the inner race of the ball bearing 4.

According to this swing arm type read/write head,
As shown for the ball bearing 4 in FIG. 2, the loads from the plungers 8 and 9 are distributed evenly in the radial direction from the tangent points A and B and the tip point C to the ball bearing 4.5. given to. This load presses the ball bearing 4.5 and the fixed shaft 7 together. In addition, as shown in FIG. 3, the load from the spring washer 10 pressurized by the pressure adjustment screw 11 is applied in the axial direction to the upper surface of the inner race of the ball bearing 4. A load is applied in the axial direction from the stepped surface of the housing 6 or the fixed shaft 7 to the lower surface of the outer race, the upper surface of the outer race of the ball bearing 5, and the lower surface of the inner race. This load presses and deforms the ball bearings 4 and 5, increasing the rigidity of the balls 12 and 13 within the ball bearing 4.5. In this way, the ball bearings 4, 5 and the fixed shaft 7 are crimped and the rigidity of the balls 12, 13 in the ball bearings 4, 5 is increased, so the arm 3 is less susceptible to vibrations and the servo head 1 is Positioning accuracy can be improved.

In this embodiment, the present invention is applied to a servo head of a servo track writer for a hard disk, but the present invention may be applied to any other suitable type of swing arm type read/write head.

In addition, in this embodiment, a swing arm type lead/lead having an arm rotatably supported on a fixed shaft via a ball bearing is used.
Although the present invention can be applied to a write head, it is generally applicable to a swing arm type read/write head having an arm rotatably supported via a bearing.

In addition, in this embodiment, a spring washer and a pressure adjustment screw are used to press and deform the ball bearing in the axial direction, but it is also possible to press and deform it using an appropriate pressing member such as a coil spring. Good too.

Furthermore, only the plunger and the notch may be provided, and the pressing member itself that presses and deforms the ball bearing in the axial direction may not be provided.

〔Effect of the invention〕

As mentioned above, the swing arm type lead/lead according to the present invention
According to the weight head, the arm to which the head is attached is less susceptible to the effects of vibration, so it is possible to improve the positioning accuracy of the head.

[Brief explanation of drawings]

FIG. 1 is a side sectional view showing an embodiment of the swing arm type read/write head according to the present invention, and FIG. 2 is the arrangement of the plunger and notch in the swing arm type read/write head of FIG. FIG. 3 is a side view showing an example of how the ball bearing deforms under pressure in the axial direction in the swing arm type read/write head of FIG. 1. FIG. 1... Servo head, 2... Hard disk, 6...
... Arm, 4, 5... Ball bearing, 6... Housing, 7... Fixed shaft, 8, 9... Plunger, 10...
・Spring washer, 11...Pressure adjustment screw, 1
2.15... balls.

Claims (1)

[Claims] 1. An arm to which a read/write head is attached is rotatably supported via a bearing, and by rotating the arm, the read/write head is attached to a disk-type recording medium. Swing arm type lead for positioning/
In the light head, a pressing member radially biased toward the bearing is provided inside the shaft inserted into the bearing, and a cut is made on the side surface of the shaft on the opposite side from the protruding position of the pressing member. A swing arm type read/write head featuring a notch. 2. A notch is provided in the shaft so that the shape formed by connecting the tangent between the notch surface and the side surface of the shaft and the tip of the pressing member is approximately an isosceles triangle when viewed from the axial direction. A swing arm type read/write head according to claim 1. 3. A swing in which an arm to which a read/write head is attached is rotatably supported via a bearing, and the read/write head is positioned relative to a disk-shaped recording medium by rotating the arm. Arm type lead/
In the light head, a first pressing member biased in the radial direction toward the bearing is provided inside the shaft inserted into the bearing, and the first pressing member is provided inside the shaft to be inserted into the bearing, and the first pressing member is biased in the radial direction toward the bearing. A swing arm type read/write head, characterized in that: a notch is provided on a side surface; and a second pressing member is provided that presses and deforms the bearing in the axial direction. 4. The swing according to claim 3, wherein the second pressing member includes a spring washer attached to the shaft so as to be in contact with the bearing, and a screw for pressurizing the washer in the axial direction. Arm type read/write head.