JPS5814473Y2 - Access shaft vibration prevention mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a mechanism for preventing axial vibration of an access shaft that guides a head in the radial direction of a medium.

In a recording/reproducing apparatus as shown in FIG. 1 in which a disk-shaped recording medium is rotationally controlled and a head is accessed in the radial direction of the medium, an access shaft controlled by an access drive means has a head provided at the tip of the access shaft that controls the rotation of the medium. In order to always confront the medium under optimal conditions over the entire access area, it must be controlled so that the axial runout is minimized.

For this reason, conventional devices of this type are equipped with a shaft vibration prevention mechanism as shown in FIG. 2 or 3.

In Figure 2, 1 is an access shaft, 2 is a guide whose two surfaces are parallel and smooth, and 3 is a tension spring 4 attached to this guide.
An arm 6 fixed to the access shaft 1 to press the bearing 5 is a support pin for this arm.

Also, in Figure 3, 1 is the access shaft, 7 is the V-shaped leaf spring, 8 is the mounting part for attaching the access shaft and one end of the leaf spring, and 9 is the mounting part for attaching the other end of the rri leaf spring. .

In such a conventional configuration, the former has the disadvantage that the production cost is high in order to achieve parallelism and smoothness of the guide, and the assembly and adjustment of the housing requires skill, and the latter has the disadvantage that the amount of access is large. There were disadvantages in that the space was too large and the bent portion of the leaf spring broke due to repeated fatigue failure, resulting in a short service life.

There are other steady rest mechanisms that have splines on the access shaft, but they are not suitable for mass production.

The present invention provides a mechanism for preventing axial runout of an access shaft that eliminates such conventional drawbacks, and one embodiment thereof will be described below with reference to the drawings.

...Access shaft 11 penetrating both side walls of Uging 10
In this case, the blocks 12 and 13 are spaced apart from each other in the longitudinal direction and fixed with screws 14, 14 to form a head mount (head mount) HM (see Fig. 1).
is fixed.

Each block 12, 13 has a head access motor 1.
Ends 17a and 17b of a belt 17 wound around a rotary body 16 whose rotation is controlled by a rotary member 5 are fixed with screws 18 and 18, and the access shaft 11 is caused to reciprocate in accordance with the rotation of the rotary body.

One block 13 is equipped with an arm 20 covered with a ring 19 made of a resin with low frictional resistance and excellent wear resistance, such as polypropylene or Teflon, and a miniature bearing 21 is attached to the tip of the arm. It is fitted with a retaining ring 22 to prevent it from falling off.

A guide means 23 is attached to the side wall 10a of the housing for fine adjustment.

That is, this guide means 23 is pivotally supported by a pin 24 provided in the housing, and is provided with an elongated hole 25 so as to be able to rotate around the pin, and a fastener passed through the elongated hole. It is configured to be fixed to the housing with an attached screw 26, and its position can be adjusted using an adjustment screw 2 passed through a compression coil spring 27 provided between the guide means and the housing.
8.

Such guide means 23 have a relocation (
The button is provided with a guide surface 23a, and a leaf spring 29 that slides relative to the arm 20 is provided on the upper surface of the button.

This leaf spring is configured to be able to press the arm 20 over the entire access area so that the bearing provided on the arm can be pressed against the guide surface 23a regardless of the position of the access shaft.

In the mechanism of the present invention, one bearing 21 is pressed against the smoothly finished guide surface of the guide means 23 via the arm 20 covered with a sliding ring by the plate spring 29, thereby preventing shaft vibration and tightening. By loosening the attached screw 26 and turning the adjusting screw 28, an angular displacement can be applied to the guide means 23 with the pin 24 as the center of rotation, so that the access shaft 11 and the guide surface can be aligned in parallel.

Once this parallel adjustment is completed, the screw 26 may be tightened or locked.

The mechanism of the present invention is superior to conventional mechanisms of the same type in the following four points.

First, the structure is simple.

Second, manufacturing costs are low, and third, assembly and adjustment are easy.

Furthermore, fourthly, it has a semi-permanent life and is highly reliable.

Furthermore, by using the resin ring 19 which has low frictional resistance and excellent wear resistance, the movement of the access shaft is smooth.
Less likely to cause looseness.

[Brief explanation of the drawing]

FIG. 1 is a side view of a recording/reproducing apparatus, FIG. 2A and FIG. 3A and FIG. 3A and FIG. FIG. 4 shows the mechanism of the present invention; FIG. 4A is a front view of the main part, FIG. Explanation of main drawing numbers, H...Head, RD...
...Recording medium, 11...Access axis, 20...
...Arm, 21...Bearing, 23a
...Rolling (guide surface), 10...Base (housing), 23...Guide means, 29
...Plate spring, 19...Resin ring.

Claims (1)

[Claims for Utility Model Registration] A bearing provided at the tip of an arm fixed to an access shaft for moving the head in the radial direction of the medium, allowing the bearing to be moved over the entire access area of the access shaft. In addition, a button is attached to an axial vibration prevention mechanism of an access shaft which is pressed into contact with a guide means attached to a base so as to adjust the position of the rolling surface by a leaf spring fixed to the guide means and slidingly contacting the arm. A mechanism for preventing axial vibration of an access shaft, characterized in that a resin ring having low frictional resistance and excellent wear resistance is sheathed on the surface of the arm in sliding contact with the leaf spring.