JPH07167772A - Friction coefficient measuring machine for magnetic disk - Google Patents

Abstract

PURPOSE:To provide a friction coefficient-measuring machine capable of simultaneously measuring both sides of a magnetic disk with the same state of relative position during actual loading in a magnetic disk device without a position shift of the magnetic disk during measuring the friction coefficient. CONSTITUTION:A magnetic disk 4 rotated with a spindle motor 3 is fixed in parallel to a vertical surface plate 2 and a head motion carriage 6 moves a block for head load stage with a stepping motor 13. To the block 7 for head load stage, head load stages 9a, 9b having head load motors 8a, 8b, respectively and head carriages 10a, 10b are fixed. To the head carriages 10a, 10b, strain gages 11a, 11b and magnetic heads 12a, 12b are fixed. The angle of the magnetic heads 12a, 12b are controlled by loosening adjustment screws 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk plate friction coefficient measuring device, and more particularly to a friction coefficient measuring device for simultaneously measuring both surfaces of a magnetic disk plate at the same relative positions as the mounting state of the apparatus.

[0002]

2. Description of the Related Art In a conventional magnetic disk plate friction coefficient measuring device, as shown in FIG. 2, a magnetic disk plate 4a to be measured is installed on a spindle 15, and a spindle rotating plate is placed below the magnetic disk plate 4a. 16 is installed. Then, by contacting the motor 17, the rotation of the motor 17 is transmitted to the spindle 15 and the spindle 15 and the magnetic disk plate 4a are rotated. The head carriage 10 is attached to the head load stage block 7a, a strain gauge 11 which is a force-voltage converter is installed in the head carriage 10, and a magnetic head 12 is attached below the strain gauge 11. In addition, the magnetic head 12
Is supported by the load wire 19 during non-measurement, and the load wire 19 pulls the load wire drive rod 18 toward the front to cause the load wire 19 to move in the up-and-down direction, causing the magnetic head 12 to move to the magnetic disk plate 4a. Load (contact) on top.

Next, when the operation opposite to that at the time of loading is performed, the magnetic head 12 is unloaded (separated) from the magnetic disk plate 4a. Further, the magnetic head 12 and the load wire 19 do not contact each other at the time of loading, but contact only at the time of unloading. The magnetic head 12 is attached on a straight line extending from the center of the magnetic disk plate 4a to the center of the strain gauge 11, and moves to the measurement position on the magnetic disk plate 4a by the operation of the linear guide 20.

[0004]

In the above-mentioned conventional friction coefficient measuring device for a magnetic disk plate, the magnetic head is mounted on a straight line extending from the center of the magnetic disk plate to the center of the strain gauge. The relative positional relationship when the plate is mounted on the magnetic disk device may differ, and there is a drawback in that an actual friction coefficient cannot be obtained. Moreover, since the magnetic head is attached only to the upper surface of the magnetic disk plate, only one surface of the magnetic disk plate can be measured, and it takes time to measure both surfaces.

Further, since the magnetic head is loaded and the measurement is performed with the magnetic disk plate installed on the spindle,
The magnetic disk plate may vibrate and adversely affect measurement, and the load wire may come into contact with the magnetic head or the magnetic disk plate when the magnetic head is loaded, or the position may be misaligned when the magnetic head is positioned. there were.

[0006]

The present invention has a drive mechanism for mounting and rotating a magnetic disk plate to be measured, a magnetic head for contacting and sliding on the magnetic disk plate, and a support arm portion. Friction of a magnetic disk plate including a positioning mechanism that holds a magnetic head at one end and positions it at a predetermined position of the magnetic disk plate, and a force-voltage converter that is fixed to the magnetic head and detects a stress received by the magnetic head. In the coefficient measuring machine, the drive mechanism is arranged such that the surface of the magnetic disk plate is in a vertical direction, and the magnetic disk includes the magnetic head, the positioning mechanism, and the force-voltage converter. The feature is that both sides of the plate can be measured at the same time. Further, the support arm portion may be composed of two members having a fulcrum and bent parallel to the magnetic disk plate, and the orientation of the magnetic head may be changed.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing the configuration of an embodiment of the present invention. As shown in FIG. 1, the magnetic disk plate friction coefficient measuring machine of the present embodiment has a vertical surface plate 2 vertically mounted on a surface plate 1, and a rotary shaft of a spindle motor 3 mounted on the surface plate 1.
It is mounted so as to be parallel to the surface of the magnetic disk plate 4, and the surface of the magnetic disk plate 4 is installed in the spindle motor 3 so as to be parallel to the vertical surface plate 2 and fixed by the clamp 5.

A head load stage block 7 is installed on the head moving carriage 6 installed on the surface plate 1 so that the center of the block 7 is located in line with the center of the side surface of the magnetic disk plate 4. This head moving carriage 6
Has a stepping motor 13 and can move the head load stage block 7 to a predetermined position. Further, the head load stage block 7 corresponds to the head load stage 9a having a head load motor 8a for corresponding to the fixed side surface of the clamp 5 of the magnetic disk plate 4, and the opposite surface of the magnetic disk plate 4. And a head load stage 9b having a head load motor 8b for mounting.

Further, one end of the head carriage 10a is attached to the head load stage 9a, and a strain gauge 11a and a magnetic head 12a are attached to the other end. Further, one end of the head carriage 10b is attached to the head load stage 9b, and the strain gauge 1 is attached to the other end.
1b and a magnetic head 12b are attached. The strain gauges 11a and 11b are force-voltage converters, and measure the stresses applied to the magnetic heads 12a and 12b, respectively.

Further, the head carriages 10a, 10b
Is composed of two members each having an intermediate portion having a step shape, and a fulcrum is provided on the step, and the fulcrum can be bent by an adjusting screw 14 (the adjusting screw on the side of the head carriage 10b is not shown). Adjustment screw 1
By tightening 4 times, the two members are tightened in a bent state. Therefore, by loosening the adjusting screw 14 and moving the tip ends of the head carriages 10a and 10b up and down in parallel with both sides of the magnetic disk plate 4, the head carriages 10a and 1a are moved from the center of the magnetic disk plate 4.
Magnetic heads 12a, 1 installed linearly in the direction of 0b
The direction (angle) of 2b can be changed.

Next, the measurement of the friction coefficient of the magnetic disk plate of this embodiment by the friction coefficient measuring machine will be described. First, after fixing the spindle motor 3 to the magnetic disk plate 4 by the clamp 5, the head moving carriage 6 is moved to the measurement position by the operation of the stepping motor 13. Subsequently, the head load motors 8a and 8b are operated to move the head load stages 9a and 9b to the magnetic disk plate 4.
The head carriage 10a,
10b and the strain gauges 11a, 11b are brought close to both sides of the magnetic disk plate 4, and the magnetic heads 12a, 12b are loaded (contacted) on both sides of the magnetic disk plate 4. When changing the directions (angles) of the magnetic heads 12a and 12b, the adjusting screws 14 of the head carriages 10a and 10b are loosened, and the head carriages 10a and 10b
After moving the magnetic head side of 10b in the upward or downward direction parallel to the surface of the magnetic disk plate 4, the adjusting screw 14
Should be tightened.

Next, the magnetic disk plate 4 is rotated by the spindle motor 3. Then, the magnetic head 12
Since stress due to frictional resistance generated by sliding of the surface of the magnetic disk plate 4 is applied to a and 12b, the stress is measured by the strain gauges 11a and 11b, respectively. The friction coefficient of the magnetic disk plate 4 is calculated based on this measurement result.

When a series of measurements is completed, the rotation of the magnetic disk plate 4 is stopped and the head load motor 8
The operations a and 8b perform the reverse operation to that at the time of loading. As a result, the head carriages 10a and 10b and the strain gauges 11a and 11b are separated from both sides of the magnetic disk plate 4, and the magnetic heads 12a and 12b are unloaded (opened) from both surfaces of the magnetic disk plate 4. Then, the head moving carriage 6 is moved by the stepping motor 13 to return to the original position (origin). Finally, the clamp 5 is released, the magnetic disk plate 4 is removed from the spindle motor 3, and all the operations are completed.

[0014]

As described above, according to the friction coefficient measuring apparatus for a magnetic disk plate of the present invention, the magnetic head is mounted on the magnetic disk plate by installing the rotary shaft of the spindle motor parallel to the surface of the surface plate. A magnetic head for measurement can be arranged on both sides of the magnetic disk, and since it can be arranged at an arbitrary angle with respect to a straight line from the center of the magnetic disk plate, the magnetic disk plate and the magnetic head in the mounted state of the magnetic disk device. Can have the same relative positional relationship with.

Further, by fixing the magnetic disk plate with a clamp, loading the magnetic head by motor control and driving the head moving carriage, it is possible to suppress vibration during measurement and simultaneously measure both sides of the magnetic disk plate. There is an effect that the measurement time can be shortened.

[Brief description of drawings]

FIG. 1 is a perspective view showing the configuration of an embodiment of the present invention.

FIG. 2 is a perspective view showing a configuration of a conventional example.

[Explanation of symbols]

 1 Surface Plate 2 Vertical Surface Plate 3 Spindle Motor 4, 4a Magnetic Disk Plate 5 Clamp 6 Head Moving Carriage 7, 7a Head Load Stage Block 8a, 8b Head Load Motor 9a, 9b Head Load Stage 10, 10a, 10b Head Carriage 11 , 11a, 11b Strain gauge 12, 12a, 12b Magnetic head 13 Stepping motor 14 Adjusting screw 15 Spindle 16 Spindle rotating plate 17 Motor 18 Load wire drive rod 19 Load wire 20 Linear guide

Claims (2)

[Claims] 1. A drive mechanism that mounts and rotates a magnetic disk plate to be measured, a magnetic head that contacts and slides on the magnetic disk plate, and a supporting arm portion that holds the magnetic head at one end thereof. A friction coefficient measuring machine for a magnetic disk plate, comprising: a positioning mechanism for positioning the magnetic disk plate at a predetermined position; and a force-voltage converter fixed to the magnetic head and detecting a stress received by the magnetic head. Is arranged so that the surface of the magnetic disk plate is in the vertical direction, and is provided with each of the magnetic head, the positioning mechanism, and the force-voltage converter, so that both surfaces of the magnetic disk plate can be measured simultaneously. A magnetic disk plate friction coefficient measuring device characterized in that 2. The magnetic disk plate according to claim 1, wherein the supporting arm portion is composed of two members having a fulcrum and refracting in parallel to the magnetic disk plate to change the direction of the magnetic head. Friction coefficient measuring machine.