JPH01171169A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To prevent misalignment of a head due to residual torque in tightening a screw by putting a washer having a spring property between a head bar and a head clamp and pressing the head clamp so as to hold down the head bar to be fixed with. CONSTITUTION:In a carriage assembly part with a carriage 4 fitted alternately with the head bar and a head spacer 9, a magnetic head 6 is fixed to the carriage 4 by fixedly holding the magnetic head 6 between the carriage 4 and the head clamp 7. That is, the washer 12 having a spring property is placed between the head bar and the head clamp 7, and when the head clamp 7 is force-fed, the washer 12 is bent and under the state of holding the head bar so as to carry out the force-fed fixing via a steel ball 8 between the carriage 4 and the head clamp 7. The magnetic head is fixed to the carriage at a constant pressure by expanding or contracting of the washer 12 with its spring property to cope with size variations caused by the environmental temp. change due to differences among individual materials in coefficient of expansion. By this method, since an effect of residual screw torque in case of using a screw is not received, misalignment of the magnetic head is hence eliminated.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a mechanism for fixing the attachment of a magnetic disk and a magnetic head for reading and writing information in a magnetic disk storage device, and particularly relates to a mechanism for fixing the attachment of a magnetic disk and a magnetic head for reading and writing information in a magnetic disk storage device. The present invention relates to a head and a magnetic disk fixing method.

[Conventional technology]

Conventional 22m heads are attached with 25 screws as shown in Figure 2. Also, the 21 AI disk is fastened to the hub of the 26 spindle motor using a 24 disk clamp with a 25 screw.

Incidentally, this type of mechanism is described in, for example, Japanese Utility Model Application Publication No. 54-58022.

[Problem that the invention seeks to solve]

When a magnetic head is fastened with a screw, thread T distortion occurs in the screw itself, and torque in the opposite direction to the tightening direction remains in the head clamp. This residual torque has a negative effect on magnetic disk storage devices. When environmental temperature changes cause minute changes due to differences in thermal expansion of screws, head clamps, head bars, etc., the upper and lower sides of the magnetic head will be misaligned due to the influence of residual torque. When it reaches about 10% of the size of the track that is written at regular intervals, errors occur due to the continuous flow of information), it ceases to function as a storage device. The same thing can be said about installing magnetic disks. The residual torque of the screws causes the disc to bend and cause the track to shift. The conventional technology does not take into consideration the residual torque in and around the screw, and there is a problem in that the head becomes misaligned due to changes in the environmental temperature.

To eliminate residual torque, it is possible to assemble without using screws, and the hector clamp can be press-fitted into the carriage hub, but the hector bar, carriage hub, and head clamp are made of light alloy to reduce mass. Normal press-fitting is rarely carried out because it causes fogging at the press-fitting part and the press-fitting force varies widely, resulting in poor workability. In addition, items that have been pressurized often have galling or seizure, and cannot be removed and reused.

[Means for solving problems]

In order to attach the magnetic head to the carriage without using screws, you can press-fit a clamp to fix the head, but there are problems such as galling. A groove (around the circumference of the carriage) or several holes are provided in the groove and steel balls are inserted. Determine the carriage groove diameter and ball diameter so that when the steel ball is placed in the groove or hole, the outermost dimension from the center of the carriage to the steel ball is larger than the inner diameter of the Herad clamp, and place the steel ball in the Hecto clamp carriage. Press fit through. By inserting a washer with spring properties between the head clamp and the head bar, the force that presses the head bar can be kept constant. The above purpose is to create a groove in the upper part of the carriage, insert a steel ball into it, press fit it with the head clamp, insert a washer with spring characteristics between the head bar and the head 7 lamp, and press the head clamp. Deflect and fix the second doper with a clamp. This prevents the head from shifting due to residual tightening torque of the screw. The same applies to magnetic disks.

[Effect]

To fix the magnetic head to the carriage in the carriage assembly part where hector bars and spacers are attached alternately to the carriage, the magnetic head is sandwiched and fixed between the carriage and the spacer clamp, and a spring force 14 is inserted between the head bar and the head clamp. Insert a washer with a certain amount of force, bend the washer when press-fitting the head clamp, and press-fit and fix the head bar through the steel ball between the carriage and the head clamp while holding down the head bar. Due to changes in environmental temperature, the dimensional change due to the tensile coefficient between each material causes the washer with spring characteristics to expand and contract, fixing the magnetic head to the carriage with a constant pressure.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG.

5 magnetic disks that record information, 2 spindle motors that rotate the 5 magnetic disks, 1 pace that is attached to one side, and a rotating part of the 2 spindle motor. 10 disk spacers stacked on top of each other are installed alternately, 12 washers with spring characteristics are placed on the top surface of 5 magnetic disks, 19 grooves are provided above the spindle hub, and 8 steel balls are placed in the grooves.

Press it in with the 11 disk clamp, press the 12 washer, and attach and fix the 5 m air disk and 10 disk spacer. A 3-pivot shaft is attached to the other side of the 1-base, and 18 bearings and 4 carriages are attached to the 3-pivot shaft, and it is made up of a 16 flat spring and a 17 spring to apply the thrust direction preload of the 8 bearings, allowing the 4 carriages to rotate. It looks like this. In addition, the 4-carriage has 6 magnetic heads and 9-head spacers installed alternately to write information on the 1i1j'ii'5 magnetic disk, and on the top of the 6-meter head there is a 20 washer with spring properties, and the 4-carriage cylinder A groove is provided at the top of the part, and 8 steel balls are inserted into the groove and press-fitted by a 7-head clamp.
Press down the 0 washer and fix the 6 m air disc and 9 head spacer to the 4 carriage. A 13 coil bobbin and 14 voice coil motor provide rotational power to the 4 carriages. Since screws are not used for the 51 disk and 6 magnetic head boxstock, there is no negative effect from the residual torque of the screws, making it possible to create high-performance, high-density equipment. Since the parts can be reused even if the crimped part is removed, an inexpensive magnetic disk storage device can be provided.

〔Effect of the invention〕

According to the present invention, it is possible to install and fix the magnetic disk and magnetic head without using screws, so there is no influence of residual screw torque that occurs when screws are used, so the displacement of the magnetic head (the upper magnetic head It is possible to create a high-performance, high-density magnetic disk device without any misalignment of the magnetic head with respect to the track written on the comrade circle of the lower magnetic head, and because it is easy to assemble, it is inexpensive. The device is ready.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a magnetic disk device according to an embodiment of the present invention, and FIG. 2 is a sectional view showing the attachment of a magnetic head and a magnetic disk in a conventional device. 1-pace, 2-spindle motor, 5-pivot shaft, 4-carriage, 5-magnetic disk,
6-magnetic head, 7...head rung, 8--steel ball,
9-Herad spacer, 10-Tisfu spacer, 1
1.-Disk flang, 12... washer, 13.
...Coil bobbin, 14 ...Voice coil motor,
15...Cover, 16...Sara spring, 17...
Tomewa, 18.-Bearing, 19.-Spindle hub.

Claims (1)

[Claims] 1. A magnetic disk that records information, a spacer that attaches the magnetic disks at equal intervals, a spindle motor that rotates the magnetic disk, a magnetic head that reads and writes information, a pivot shaft and carriage at the center of rotation of the magnetic head, and a magnetic head. In a magnetic disk device consisting of a coil bobbin that rotates a coil bobbin, a voice coil motor, a spindle motor, and a base and cover that fix a pivot shaft, a groove or a periphery is formed in a cylindrical carriage and a spindle hub to which a magnetic head and magnetic disk are attached. Make a hole and insert a steel ball, set the dimensions so that the outer diameter of the steel ball protrudes a little from the cylindrical carriage or spindle hub, press fit through the steel ball with a head clamp or a disc clamp, and connect it with the disc clamp. A magnetic disk device characterized in that a washer with spring characteristics is sandwiched between the magnetic head and the magnetic disk, and a washer with spring characteristics is sandwiched between the disk clamp and the magnetic disk.