JPS61253665A - Manufacture of disk rotation driving device - Google Patents

Abstract

PURPOSE:To correct and work not only the fitting surface of a slip pad but also the fitting seat surface of a magnet by fixing a hub base provided with a reference surface for placing a disk hub and the fitting seat surface of the magnet to a revolving shaft and thereafter correcting the reference surface, installing a pin and assembling it in a motor. CONSTITUTION:A hub base 100 is fixed to the revolving shaft 1, the shaft right angle accuracy between a fitting surface 100a and the revolving shaft 1 is inspected and correction and working are performed. Also, by following this working and correction, the correction and working of a fitting seat surface 100b are also performed and it is brought to a finish working to a prescribed size. Next, a slip pad 3 and a magnet 2 are stuck to the fitting surface 100a and the fitting seat surface 100b, respectively, and assembled into a motor. In this case, the hub base 100 is made to abut on a bearing 8 and brought to the upper and lower directions and thereafter, a plate spring 50 is attached to the hub base 100 with screws M1, M2 and the assembly is ended.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method of manufacturing a disk rotation drive device that can be applied to a floppy disk recording and reproducing device.

(Prior Art) As a means for rotationally driving a medium such as a floppy disk when transmitting and receiving information, there is a disk rotation drive device having a configuration as shown in FIG. 4, for example.

A floppy disk, such as a 3.5-inch type, as a medium to be installed in this disk rotation drive device has a center hole in its center that engages with the one-rotation shaft 1. A magnetic material plate is provided on the disk hub provided around the disk.

When installing a disk in such a disk rotation drive device, the magnetic material plate is magnetically attracted by the disk-shaped magnet 2, and the disk hub is brought into close contact with the slip pad 3, and the disk drive The pin 4 for this purpose will be engaged with the pin hole drilled in the magnetic plate.

The pin 4 is fixed to a cantilevered tongue 5a of the leaf spring 5 and is located in a space facing the magnet 2, in order to ensure smoothness when attaching and detaching the disk. It can be swung freely.

Here, the distance from the top surface of the magnet 2 to the top surface 3a of the slip pad 3, which is the media hub mounting section, is related to the so-called chucking performance of magnetically attracting the disk, so high accuracy is required. .

Here, since the disc hub is placed on the upper surface 3a, the armpit is directly the reference surface for placing the disc hub.
Mounting surface 1 on hub stand 10 on which slip pad 3 is placed
Since 0a also indirectly functions as a reference surface for mounting the disk hub, hereinafter, the mounting surface 10a will also be referred to as a reference surface for mounting the disk hub.

This disk rotation drive device has a configuration in which a rotary shaft 1 is rotatably supported by a fixed chassis 6 via bearings 7 and 8 and is rotated by a motor.

A boss 9 is further integrally attached to the rotary shaft 1, and the magnet 2 and the slip pad are attached to the boss 9.

The leaf spring 5 is supported by the boss 9 and the hub base 10, and the pin 4 is fixed to the cantilevered tongue piece 5a located in the notch of the hub base 10. It is able to swing freely.

The assembly procedure is to first fix the pin 4 to the leaf spring 5 by caulking, then fit the leaf spring 5 into the boss 9, press fit it into the hub stand 10, and then attach the hub stand 10 to the rotating shaft 1. to create an intermediate assembly.

Next, at this stage of intermediate assembly, 1
Machining is performed to correct the axis perpendicularity accuracy with the rotating shaft 1.

Thereafter, the slip pad 3 is attached to its mounting surface 10a, and the magnet 2 is attached to its mounting seat surface 10b, respectively, and then the rotating shaft 1 is assembled into the motor. This is because, if the shaft-perpendicularity accuracy is not achieved, surface runout may occur when the disc is installed.

(Problem to be solved by the invention) By the way, when the above-mentioned modification process is performed, the height dimension of the mounting surface 10a changes, so in order to ensure the above-mentioned interval h1 at a predetermined dimension, the mounting surface 10b must also be modified. However, since the pin 4 and the leaf spring 5 are irremovably located in the area facing the mounting surface 10b, the correction tool interferes with the mounting surface 10b, making it impossible to carry out such correction.

Therefore, since it is not possible to determine the interval h with high accuracy, there is a risk that the disk will be chucked incorrectly.

(Means for Solving the Problems) Therefore, an object of the present invention is to create a method for manufacturing a disk rotation drive device that can modify the mounting surface of a magnet in conjunction with the modification of the mounting surface of a slip pad. Our goal is to provide the following.

In accordance with the above-mentioned object of the present invention, the hub stand is provided with a reference surface for placing a disk hub and a mounting seat surface for a magnet for attracting the disk in the outer peripheral area of the rotating shaft, and after the hub stand is fixed to the rotating shaft, the above-mentioned There is provided a method for manufacturing a disk rotation drive device, which is manufactured by correcting a reference plane, then mounting a pin in a predetermined position, and then assembling a rotating shaft into a motor.

(Function) In the present invention, the pin is not attached at the stage of modifying the mounting seat surface of the magnet, so that the mounting seat surface can be modified without worrying about interference with the pin.

(Example) An example of a disk rotation drive device suitable for implementing the present invention is shown in FIGS. 1 and 2.

In the prior art, the leaf spring 5 was supported by the boss 9 and the hub base 10, and the boss 9 and the hub base 10 were fixed by press fitting, so when modifying the mounting surface of the magnet, the pin 4 and It was not possible to disassemble the integral leaf spring 5.

In this example, the leaf spring 50 fixing the pin 4 is detachable. For this reason, instead of employing a method of supporting the boss and the hub base under pressure as in the prior art, each end of the bifurcated branch as shown in FIG.
The configuration was such that it was attached to 0.

The other end of the spring 50 is bent, and the bent end 5
The portion 0a contacts the surface of the rotor 11 to maintain the height of the tongue piece 50b to which the pin 4 is attached.

In this way, since the leaf spring 50 is attached using screws M x M2, there is no need to separate the boss and the hub stand as in the prior art.Therefore, in this example, the conventional boss and hub stand are The hub stand 100 is configured in an integrated form. A mounting surface 100a for the slip pad 3 and a mounting seat surface 100b for the magnet 2 are formed on the hub stand 100 in the outer peripheral area of the rotating shaft 1.

A stator coil 12 is arranged on the chassis 6, and a magnet 13 is arranged on the rotor 11 facing the stator coil 12, forming the main part of the motor that rotates the shaft 1 for one rotation.

The rotating shaft 1 is rotatably supported by bearings 7 and 8 mounted on a bearing holder 14 mounted on the chassis 6.

This disk rotation drive device is assembled and manufactured in the following steps.

First, the hub stand 100 is fixed to the rotating shaft 1. and,
At this stage, the axis perpendicularity accuracy between the mounting surface 100a and the rotating shaft 1 is inspected, and correction processing is performed.

Along with this modification, the mounting seat surface 100b is also modified and finished to a predetermined dimension.

Next, the slip pad 3 is attached to the attachment surface 100a, and the magnet 2 is attached to the attachment surface 100b.

The intermediate assembly thus configured is assembled into a motor.

At this time, the hub stand 100 is brought into contact with the bearing 8, thereby positioning it in the vertical direction.

After that, attach the leaf spring 50 to the hub base 1 with screw M2.
Attach it to 00 to complete the assembly.

Another example of a disk rotation drive device suitable for implementing the present invention is shown in FIG.

In the embodiment described above, the leaf spring 50 was attached to the hub stand 100, but in this embodiment, the only difference is that the leaf spring 500 is attached to the rotor 11 with screws M.

Others are similar to the above example. Incidentally, the attachment of the leaf spring is not limited to screws, and any method such as caulking or welding may be used.

(Effects) According to the present invention, since it is possible to modify both the reference surface for disc hub mounting and the magnet mounting seat surface, the interval dimension between them can be managed and the chucking performance of the disc can be ensured. It is convenient to do so. Additionally, since the hub stand is integrated with the boss, the number of parts is reduced.

[Brief explanation of drawings]

FIG. 1 is a sectional view taken along the line xx shown in FIG. 2 of a disk rotation drive device suitable for carrying out the present invention;
FIG. 3 is a sectional view of a main part of a disk rotation drive device illustrating another embodiment of the present invention, and FIG. 4 is a sectional view of a disk rotation drive device according to the prior art. 1...Rotating axis, 4...Bin, so, soo...
Leaf spring. 100... Hub stand, 100a... Mounting surface (reference surface for disc hub mounting), 100b... Magnet mounting seat surface. Procedural amendment August 21, 1985

Claims (1)

[Scope of Claims] A system for transmitting and receiving information while adsorbing a disk to a hub stand fixed to a rotating shaft using magnetic attraction and rotating the disk together with the rotating shaft using a disk drive pin. In the disk rotation drive device, the hub stand is provided with a reference surface for placing the disk hub and a magnet mounting surface for disk adsorption in the outer circumferential area of the rotating shaft, and after the hub stand is fixed to the rotating shaft, the above-mentioned standards are set as appropriate. 1. A method of manufacturing a disk rotation drive device, which comprises manufacturing the disk rotation drive device by correcting the surface, then mounting the pin in a predetermined position, and then assembling the rotation shaft into the motor.