JPH0721285B2 - Actuator-guide shaft fixing mechanism - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a guide shaft fixing mechanism used for a head actuator of a magnetic disk device or the like.

[Prior art]

An example of a conventional guide shaft fixing mechanism is shown in FIGS. 1, 2, and 3.

Although not shown in FIGS. 1 and 2, a magnetic head 4 for recording and reproducing is fixed to a moving table 3 on a magnetic disk 2 driven by a motor fixed to the frame 1. The movable table 3 has a slide guide hole and engages with the guide shaft 5 to slide. The guide shaft 5 is a contact surface 8 of the frame 1.
It is fixed by being pressed by a fixed spring 6 tightened by a set screw 7.

FIG. 3 shows another example of a conventional guide shaft fixing mechanism. The guide shaft 14 is pressed and fixed to the contact surface 12 of the frame 11 by a fixed spring 15 made of a wire material or a plate material.
At this time, the fixed spring 15 is fixed by deforming and engaging with the protrusion 13 of the frame 11, and at the same time, the spring force necessary for fixing the guide shaft 14 is generated.

In the conventional guide shaft fixing mechanism shown above, 1) A large space is required because a leaf spring, a wire spring, etc. are used to fix the guide shaft.

2) Since the fixing force of the guide shaft is generated from the restoring force due to the deformation of the spring, it is very difficult to control the shape and dimensions of the spring material.

3) Because of 2), the fixing force of the guide shaft may vary greatly, and the fixing function may not be sufficiently exerted.

4) In order to improve 2) and 3), it is necessary to take a sufficient spring length, etc., so that a larger space is occupied.

There was a problem.

〔Purpose〕

The present invention solves such a problem, and an object thereof is to stabilize the guide shaft by pressing the guide shaft with the conical surface of the screw head having the conical surface and directly utilizing the tightening force of the screw. Another object of the present invention is to provide an actuator guide shaft fixing mechanism that secures a sufficient fixing force required for the fixing and further occupies a small space for fixing.

〔Overview〕

The actuator guide shaft fixing mechanism of the present invention is provided with a moving base to which the recording / reproducing means is fixed, a rigid actuator guide shaft for slidably holding the moving base, and a projection for positioning the actuator guide shaft in the radial direction. An actuator guide shaft fixing mechanism comprising a frame provided on the opposite side of the protrusion and a frame sandwiching the actuator guide shaft, wherein the screw has a dish-like shape in which the head is in contact with the actuator guide shaft. The actuator guide shaft has a conical surface, and the actuator guide shaft is pressed and fixed to the protrusion of the frame by the tightening force of the screw.

〔Example〕

 Hereinafter, the present invention will be described in detail based on examples.

4 and 5 are explanatory views showing the outline and principle of the actuator guide shaft fixing mechanism of the present invention. The actuator guide shaft (hereinafter, referred to as a guide shaft) 25 has a conical surface of a screw 26 (a flat head screw or the like) whose screw head is a conical surface and which is screwed into one surface 28 of the frame having two surfaces. It is fixed by abutting against the one surface 28. Fifth
In the figure, when the screw 26 is tightened with the torque T, a thrust F is generated. This thrust F is a component force at the contact surface with the guide shaft 25.
It is decomposed into F ₁ and F ₂ , and the component force F ₁ is involved in fixing the guide shaft 25.

As described above, according to the present invention, the fixing force of the guide shaft is not constituted by the displacement of the spring but by the component force directly generated from the tightening torque of the screw, so that the screw is tightened with a constant torque by, for example, a torque driver. As a result, the guide shaft fixing force can be managed directly and easily, and reliable and stable fixing with little variation is possible. Furthermore, the guide shaft pressing member is no longer required, reducing the number of parts and the number of assembly steps,
Significant cost reduction has become possible.

FIG. 6 is an explanatory view showing the arrangement of the device having the guide shaft fixing mechanism of the present invention. Although not shown, the surface of the magnetic disk 22 driven by the motor fixed to the frame 21 is moved to perform recording and reproduction. The magnetic head 24 to be performed is fixed to the movable table 23, and the movable table 23 has the contact surface 27 and the screw 26 of the frame 21.
Is guided by a guide shaft 25 fixed by. As shown in FIG. 6, the present invention does not require a guide shaft fixing member that occupies a large space, and is a fixing structure that is very simple and uses a small space. Further, it becomes easy to arrange another mechanism in the surplus space created by the above-mentioned structure, and it has become possible to increase the density of the device and greatly reduce its size.

FIG. 7 is an explanatory view showing an application example of another actuator guide shaft fixing mechanism of the present invention. The guide shaft 31 is a screw 32 having a conical surface that is screwed into one surface 35 of a frame 34 having two surfaces.
The conical surface and the one surface 35 and the other surface 33 of the frame 34 are positioned and fixed. The other conical surface of the screw 32 is in contact with the slope 36 of the frame 34. In the state described above, the thrust F due to the tightening torque T is
Occurs on the conical surface of the screw head that abuts the slope 36 Therefore, further fixing force is transmitted to the guide shaft 31.

Further, as shown in FIG. 8, even when the conical surface of the head of the screw 42 is eccentric by the eccentricity ε, the conical surface of the screw 42 is formed by the one surface 43 and the other surface 45 of the frame 44 by the action of the slope 46. The positioned guide shaft 41 is surely pushed and fixed.

As described above, the guide shaft fixing mechanism of the present invention exhibits a particularly remarkable fastening effect when the shape of the screw head varies.

9 and 10 are explanatory views showing still another application example of the present invention. The guide shaft 51 is positioned and fixed by the contact surface 53 of the frame, the other surface 55 and the conical surface of the screw 52 having a conical surface. The other conical surface of the screw 52 is in contact with the slope 54. The guide inclined surface 54 is formed from a part of a conical surface having the same shape as the conical surface of the screw 52 so as to stably contact the screw 52 when the screw 52 is screwed in. Therefore, when the screw 52 is fastened to the inclined surface 54, the screw 52 is self-aligned without shifting in the direction shown by the arrow in FIG. From the above-mentioned effects, not only the assemblability is improved, but also the screw 52 and the guide surface 54
Generates a strong and stable guide shaft fastening force from the wedge effect caused by abutting on a large area. Further, it goes without saying that the shape of the guide surface 54 may be a divided conical surface or a projection shape that produces an effect equivalent to this.

FIG. 11 is an explanatory diagram showing still another application example of the present invention. Distance l between the contact point of screw 62 and guide shaft 61 and frame 63
Tighten the length of the screw and increase the torque T
When the length of 62 is deformed like the chain line in the figure, the screw 62 generates a restoring moment M, and the fixed component force F ₃ acts on the guide shaft 61. That is, the deformation of the screw produces a preload effect. As described above, the component force of the torque T and the component force of the preload resulting from the screw deformation act on the guide shaft 61, and a further fixing effect is produced.

〔effect〕

As described above, according to the present invention, since the actuator guide shaft made of a rigid body is fixed to the projection provided on the frame by the screw having the conical surface of the dish shape, the radial positioning of the actuator guide shaft is extremely accurate. Therefore, high-density data recording / reproducing can be accurately achieved.

2.Compared to the conventional method of fixing with a leaf spring, it does not require a large space, and the device can be downsized. Further, when a leaf spring is used, variations in spring force and the like must be managed, but in the configuration of the present application, it is not necessary to manage variations in the shape of parts, which is excellent in mass productivity.

It is a very useful invention for a magnetic disk device.

[Brief description of drawings]

FIG. 1 is a block diagram of a conventional guide shaft fixing mechanism. FIG. 2 is a perspective view of an essential part of FIG. FIG. 3 is a perspective view of an essential part showing another conventional guide shaft fixing mechanism. FIG. 4 is a perspective view of an essential part of the guide shaft fixing mechanism according to the present invention. FIG. 5 is an explanatory view of a guide shaft fixing mechanism according to the present invention. FIG. 6 is a block diagram of the guide shaft fixing mechanism of the present invention. FIG. 7 is a sectional view showing an application example of the guide shaft fixing mechanism according to the present invention. FIG. 8 is an explanatory view of a fixed state when the conical surface of the head of the screw is eccentric. FIG. 9 is a plan view of an essential part showing another application example of the guide shaft fixing mechanism of the present invention. FIG. 10 is a perspective view of an essential part of FIG. FIG. 11 is a side view showing still another application example of the guide shaft fixing mechanism of the present invention. 1,11,13,21,34,44,63 …… frame 8,12,27,28,33,35,43,45,53,55 …… frame contact surface 36,46,54 …… frame Slope 5,14,25,31,41,51,61 …… Guide shaft 7 …… Set screw 6,15 …… Fixed spring 26,32,42,52,62 …… Screw head is formed by conical surface Screw 2,22 …… Magnetic disk 8,23 …… Movable stand 4,24 …… Magnetic head

Claims (1)

[Claims] 1. A frame provided with a movable table on which recording / reproducing means is fixed, a rigid actuator guide shaft for slidably holding the movable table, and a projection for positioning the actuator guide shaft in a radial direction. And an actuator guide shaft fixing mechanism comprising a screw arranged on the opposite side of the protrusion with the actuator guide shaft interposed therebetween, wherein the screw has a dish-shaped conical surface on the head for abutting the actuator guide shaft. Then, the actuator guide shaft fixing mechanism, wherein the actuator guide shaft is pressed and fixed to the protrusion of the frame by the tightening force of the screw.