JPH0256782A - Fixing structure for magnetic head arm - Google Patents

Abstract

PURPOSE:To surely fix an arm by providing a clamp with the background of a groove supported at a cantilever as a pressing point and pressing a groove part backsurface by the clamp. CONSTITUTION:At a carriage 21, grooves 22 and 23 supported by sandwiching an arm 20 to the right and left of the tip are formed, the root of one side groove 22 is formed in a cantilever shape and at the tip, the groove 22 is supported. As a means to pressurize the background of the groove 22, a clamp 25 with the background of the groove 22 as the pressing point is provided. For the clamp 25, the center is pressed with a bolt 26 which penetrates a cantilever 24 and is screwed into the carriage 21. The arm 20 inserted into grooves 22 and 23 can be fixed by tightening the bolt 26. Thus, the groove 22 is adhered to the arm 20 and the arm 20 can be surely fixed to the carriage 21.

Description

[Detailed Description of the Invention] [Summary] The present invention relates to a fixing structure for attaching and fixing a plurality of magnetic head arms supporting a magnetic head to a carriage that positions the magnetic head of a magnetic disk device on an arbitrary trunk of a magnetic disk. In order to securely fix the magnetic head arm to the carriage, the carriage is provided with corresponding grooves on both sides of the magnetic head arm attachment part, one of which is supported by an elastic cantilever. In addition, the cantilever is independent for each magnetic head arm, and in the magnetic head arm fixing structure in which the magnetic head arm inserted into the groove is fixed by pressing the back side of the groove of the cantilever, the cantilever is As a means for pressing the back surface of the supported groove, a clamp having the back surface of the groove as a pressing point is used.

[Industrial application field]

The present invention relates to a fixing structure for attaching and fixing a plurality of magnetic head arms supporting magnetic heads to a carriage for positioning a magnetic head of a magnetic disk device on an arbitrary track on a magnetic disk.

[Conventional technology]

FIG. 5 is a diagram showing a conventional magnetic disk device. This is a housing 1 containing multiple magnetic disks 2 as recording media.
is attached to a shaft 3 that is rotationally driven by a motor, and a magnetic head 4 that writes information to or reads information from the magnetic disk 2 is attached to a carriage 7 via a support spring 5 and a magnetic heel arm (hereinafter referred to as arm) 6. The carriage 7 can position the magnetic head 4 on any desired track 8 on the magnetic disk 2 .

In such a magnetic disk device, the following requirements (1) to (4) are required for fixing the arm 6 to the carriage 7.

(1) Relative height and parallelism to the disk are satisfied.

(2) Deflection (shift), etc. should be sufficiently small against vibrations, shocks, and thermal changes. The deviation in the disk radial direction is TMR
(Track Misregistration). Further, vertical deviation also causes TMR due to the inclination of the head support spring, etc., and also leads to a change in the flying height of the magnetic head and a decrease in flying stability.

(3) High rigidity when installed. Naturally, the vibration characteristics of the arm vary depending on its boundary conditions, and are more or less coupled with the rigidity of the carriage side.

(4) Good assembly performance.

A conventional arm fixing structure developed to meet the above requirements is shown in FIGS. 6 to 13.

FIG. 6 shows a screw hole provided in the in-plane direction of the arm 6 (generally, since the arm is plate-shaped parallel to the magnetic disk, the direction parallel to the magnetic disk is referred to as the in-plane direction for convenience),
It is fixed with screws 9 from the rear of the carriage 7.

In FIG. 7, a hole or an oblong cutout is provided in the arm 6, and a tapped hole is provided in the carriage 7 side, and the arm 6 is fixed with a screw 9 from the arm side.

FIG. 8 shows that a groove 10 is formed in the carriage 7 in its height direction, a surface 11 parallel to the magnetic disk is machined, a hole or an oblong notch is provided there, and a screw hole is provided in the arm 6 in the thickness direction. is fixed with screw 9 from the carriage side.

In FIG. 9, a groove 10 is formed in the carriage 7 in its height direction, a surface 11 parallel to the magnetic disk is machined, a threaded hole is provided there, a hole is provided in the arm 6, and a screw 9 is attached to the carriage 7. Fixed to 7.

Fig. 10 shows that the carriage 7 is provided with a receiving section 12 for each arm, one arm 6 is provided with a notch 13, and a retracting bolt 14 (the arm is pulled in to the opposite side from the threaded section and the carriage receiving section is pressed to the It is pulled into the carriage 7 and fixed using a bolt (with a taper, etc.) and a nut 15.

In FIG. 11, arms 6 are stacked and the whole is fixed with through bolts 16.

In FIG. 12, grooves 17 are provided in the carriage 7 so as to sandwich both ends of the arm 6 in the width direction, one or both of which are provided with spring properties, and the arm 6 is fixed by tightening in the width direction with a screw 9.

FIG. 13 is similar to FIG. 12, but the position of the screw 9 is different.

[Problem to be solved by the invention]

In the above-mentioned conventional magnetic hesodon arm fixing structure, the sixth
In the case shown in Fig. 7 and Fig. 7, the plate thickness of at least the part where the arm 6 is attached must be larger than the diameter of the tapped hole or hole, and the plate thickness of the arm 6 is limited in small devices with a small disc spacing. It is difficult to realize this because of the In addition, the mounting requires some other method to ensure height accuracy.

Furthermore, if the retracting force of the screw 9 is weak, it is likely to shift in the vertical direction.

Further, in the case shown in FIGS. 8 and 9, the mounting parallelism of the arm 6 is determined by a relatively small area of the carriage groove, so that it is difficult to achieve accuracy. It also tends to shift in the track direction.

Also, as in FIGS. 6 and 7, the thickness of the arm plate, the carriage mounting portion, and the height of the screw head must be less than the pinch of the magnetic disk. The example shown in FIG. 9 is difficult to apply in practice because it is difficult to tighten the screws.

In the case shown in FIG. 10, the force that presses the arm 6 against the carriage 7 is the downward component of the retracting force and the deflection of the retracting bolt 14, but at this time the frictional force acts in the direction of pulling up the arm. In order to improve the springiness and increase the area of the bridge on the carriage side, it is necessary to lengthen the retraction bolt 14, but if the bolt 14, the arm 6, and the carriage 7 are made of different materials, the effect of thermal expansion can be reduced. receive. In addition, the dimensions of the carriage support are very limited because the thickness of the component arm plus the thickness of the bolt must be less than the pinch of the magnetic disk.

In the stacking system shown in FIG. 11, the plate thickness accuracy, parallelism, etc. of each arm 6 are accumulated. In addition, in the case of laminating swing-type arms with holes in their cylindrical shafts, they are generally fitted together with a clearance fit, so they are likely to shift in the circumferential direction due to large accelerations during access. Further, this shift does not occur in one arm alone, but affects other arms.

In the devices shown in FIGS. 8, 9, and 11, it is not possible to attach or detach a specific arm, and the attachment or detachment must be performed sequentially starting from the uppermost arm or the lowermost arm.

On the other hand, in the case of Figures 6 and 10, the screws must be tightened from the rear of the carriage 7, so in the case of an outer ring rotating actuator with a fixed shaft, the retracting position should be set away from the center of the shaft. , must be attached to the carriage 7 using a sub-block.

On the other hand, in the case shown in FIG. 7, since the screws are tightened from the front of the arm 6, one must be careful of the presence of the head, which impairs work efficiency.

In the device shown in FIG. 13, the arm 6 and the screw 9 overlap, so the pitch of the arms becomes large, making it unsuitable for miniaturization.

In the case of the one shown in FIG. 12, when the spring portion 18 is screwed, this portion is largely bent as shown in FIG. 14, and the arm attachment portion tends to open rather than transmitting sufficient force. In addition, the stress is high in the screw tightening part, and the stress is particularly concentrated in this part because there is a hole for the screw. Furthermore, as shown in FIG. 15, even if the screw 9 is brought to a non-elastic portion of the cantilever beam, a moment is generated because the point of application of the force does not coincide with the screw 9. It is also disadvantageous in terms of space.

As mentioned above, each arm fixing structure has its own drawbacks, but in order to narrow the magnetic disk spacing and realize a compact magnetic disk device, it is necessary to reduce the thickness of the arm. Considering constraints and ease of assembly, the structure shown in FIG. 12, in which screws are tightened from the side of the arm, is suitable. However, the one shown in FIG. 12 also has the above-mentioned drawbacks.

SUMMARY OF THE INVENTION An object of the present invention is to provide a magnetic head arm fixing structure that can securely fix a thinned arm.

[Means to solve the problem]

In order to achieve the above object, the magnetic head arm fixing structure of the present invention is such that the carriage 21 is provided with grooves 22 and 23 corresponding to both side surfaces of the magnetic head arm mounting portion, and one of the grooves 22 is replaced by an elastic piece. It is supported by a support beam 24, and the cantilever beam 24 is independent for each magnetic head arm 20, and the magnetic head arm 20 inserted into the grooves 22 and 23
In the magnetic head arm fixing structure in which the magnetic head arm is fixed by pressing the back side of the groove 22 of the cantilever beam, the groove 2 supported by the cantilever beam 24 is fixed.
2 is characterized in that a clamp 25 is used as a means for pressing the back surface of the groove 22, with the back surface of the groove 22 as a pressing point.

[For production]

A clamp 25 whose pressing point is behind the groove 22 supported by the cantilever beam 24 is provided, and when the arm 20 inserted into the groove 22 is fixed by pressing the clamp, the reaction force from the arm 20 and Since the pressing point (the point of application of force) is almost flat, the groove 22 comes into close contact with the arm 20, making it possible to securely fix it.

〔Example〕

FIG. 1 is a diagram showing an embodiment of the present invention, in which (a) is a plan view and (b) is a front view.

In the figure, 20 is a magnetic head arm, 21 is a carriage, and the carriage 21 has grooves 22 and 23 formed on the left and right sides of its tip for inserting and supporting the arm 20,
The root of one of the grooves 22 is formed into a cantilever shape, and the groove 22 is supported at the tip, which is similar to the conventional example explained in FIG. By providing a clamp 25 whose pressing point is behind the groove 22 as means for pressing the rear side, the clamp 25 can be pressed by a bolt 26 screwed into the carriage 21 through the cantilever beam 24 at its center. It is supposed to be done. The arm 20 inserted into the grooves 22 and 23 can be fixed by tightening the bolt 26.

According to this embodiment, since the clamp 25 presses the back of the groove 22, it coincides with the reaction force point from the arm 20, the groove 22 comes into close contact with the arm 20, and the arm 20 can be securely fixed to the carriage 21. can.

FIG. 2 is a diagram showing a second embodiment of the present invention.

This embodiment differs from the previous embodiment in that the carriage 21
The groove portion 22 and cantilever beam 24 on one side and the groove portion 23 on the other side are constructed as separate parts from the carriage body. In this example, the groove component on the cantilever side is fixed with a screw 27, but since it is pressed against the carriage 21 with a clamp 25 and a bolt 26, it can be constructed without using the bolt 26. In addition, although only the cantilever portion and the groove portion of the groove part are separated by the slit, it is also possible to separate all of them for each arm.

According to this example, workability is better than in the previous example.

FIG. 3 is a diagram showing a third embodiment of the present invention.

This embodiment differs from the previous embodiment in that one of the grooves 23
There are two contact points 23a with the arm 20.

23b, and the other groove portion 22 is located at the center of the two contact points, resulting in three-point contact.

According to this embodiment, the stability of attachment is improved.

FIG. 4 is a diagram showing a fourth embodiment of the present invention.

This embodiment is the same as the previous embodiment except that the arm side surface and the groove shape of the mounting portion are tapered.

According to this embodiment, it is possible to improve the arm mounting height accuracy.

〔Effect of the invention〕

As explained above, according to the present invention, since the back surface of the groove is pressed by the clamp, the stress on the cantilever portion can be reduced.
Since no moment is generated in the in-plane direction of the arm with respect to the arm, it can be securely fixed.

Furthermore, since the screws are not directly tightened, it is possible to prevent the cantilever beam from being twisted in the in-plane direction.

Furthermore, since there is no need for mounting holes or screw holes in the arm, it is easy to make the device thinner, and the spacing between the disks can be narrowed, making it possible to downsize the entire device.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a first embodiment of the invention, FIG. 2 is a diagram showing a second embodiment of the invention, FIG. 3 is a diagram showing a third embodiment of the invention, and FIG. 4 is a diagram showing a third embodiment of the invention. 14 shows a fourth embodiment of the present invention, FIG. 5 shows a conventional magnetic disk device, FIGS. 6 to 13 show a conventional magnetic head arm fixing structure, and FIG. and FIG. 15 are the basis for explaining the problems to be solved by the present invention. In the figure, 20 is a magnetic head arm, 21 is a carriage, 22 and 23 are grooves, 24 is a cantilever, and 25 is a clamp.

Claims (1)

[Claims] 1. The carriage (21) is provided with grooves (22, 23) corresponding to both sides of the magnetic head arm attachment part, and one of the grooves (22) is formed into an elastic cantilever beam (24). support it with
Moreover, the cantilever (24) is independent for each magnetic head arm (20), and the magnetic head arm (20) inserted into the groove (22, 23) is connected to the back surface of the groove (22) of the cantilever. In the fixing structure of the magnetic head arm that is fixed by pressing, a clamp (25) with the back surface of the groove (22) as a pressing point is used as a means for pressing the back surface of the groove (22) supported by the cantilever beam (24). A fixing structure for a magnetic head arm, which is characterized by the use of a magnetic head arm.