JPS5930277A - Magnetic disk driving device - Google Patents

Abstract

PURPOSE:To stabilize a collet part when a disk is being driven, and to make it small-sized, by simple constitution obtained by providing the collet part of a self-aligning structure on a position corresponding to a hub receiving position of the tip of a hub holder consisting of an elastic body such as a plate spring, etc. fixed to the upper part of a cassette staring body. CONSTITUTION:A hub holder 8 consisting of an elastic body is stuck to the upper face of a cassette storing body 7, and a collet part 10 is fitted to a hole 8a of the tip by a snap ring 9. In case when a magnetic disk cassette 4 is inserted into the cassette storing body 7 and a magnetic disk 4a is driven, a tapered part 11a is formed on a collet shaft 11, and since the hole diameter of the hole 8a of the hub holder 8 corresponding to its part is made to have room, self-aligning can be executed in accordance with rotation of a hub 4b, and pressing force of the hub holder 8 can be transferred stably to a hub 6, therefore, the rotating face of the magnetic disk 4a becomes stable and the good performance is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic disk drive RIJJ device, particularly to a hub holder and a collet device suitable for simplifying the structure and downsizing of a magnetic disk cassette holder.

Conventionally, the hub holding part was provided protruding from the upper part of the cassette storage body, a pole bearing was provided at the bottom via a push spring, and a collet was provided on the outer periphery of the hub holding part, which resulted in a complex structure. The protrusion increases, and openings must be provided in the part of the control board where each control element is attached, making it impossible to use the board effectively.
Another drawback was that the height of the main body of the device was high.

The purpose of the present invention [174] is to eliminate the drawbacks of the prior art, provide a simple structure, and improve the stability of the collet part while driving the magnetic disk.
This is to reduce the size.

Hereinafter, an example will be explained based on the drawings.

1 is a chassis to which various parts of the device are attached. 1
A is a boss formed integrally with the chassis, and ball bearings 2 are provided at both inner ends of the boss. Reference numeral 3 denotes a motor for rotating a magnetic disk 4a built in the magnetic disk cassette 4. A shaft 5 directly connected to the motor 3 is provided with a hub holder 6 on which a hub 4b provided at the center of the magnetic disk 4a is placed.

The magnetic disk 4a is fixed to the hub 4b, and is configured to be mounted on the tip end 5a of the shaft 5 and centered thereon.

On the other hand, a hub holder 8 made of an elastic body such as a leaf spring is fixed to the upper surface of the center housing 7, and a hole 8a is provided at a position corresponding to the position of the hub receiver 6 at the tip. A shikoresoto part 10 is attached. Collet part 10
The collet shaft 11 has a tapered part 11 toward the hole 8a side.
A is formed, and the hole diameter of the hole 88 penetrating portion is made to have a full order of magnitude.

A collet 13 is provided on the outer periphery of the collet shaft 11 via a bearing 12, and the pressing force of the hub holder 8 is transmitted to the collet 13 so that the collet 13 is pressed against the hub 4b of the magnetic disk 4a and the hub holder 6 so that the mounting state of the magnetic disk 4a does not change. It is something to do.

Further, openings 7a are provided on both sides of the cassette storage body 7 at portions corresponding to the positions of the holes 4C of the magnetic disk cassettes 4, and /. protrusions 8b for preventing pop-out are provided at the tips of the inclined portions on both sides of the holder 8. has been established. Thereby, when the magnetic disk cassette 4 is ejected, the protrusion 8b for preventing the protrusion of the hole 4C engages with the protrusion 8b to prevent abnormal ejection.

In addition, a notch 7b is provided on both sides of the cassette storage body 7 on the magnetic disk cassette 4 insertion entrance side, and an opener 15 for opening and closing the shutter 14 built into the magnetic disk cassette 4 is inserted when inserting the hub holder 8. It is elastically supported by both ends.

A protrusion 15a is provided on the inside of the opener 15, and the shutter 14 is opened and closed by moving a shutter opening/closing protrusion 4d on the side surface of the magnetic disk cassette 4 during insertion.

With the above configuration, according to the present invention, when the magnetic disk cassette 4 is inserted into the cassette storage body 7 and the magnetic disk 4a is driven, the collet shaft 1 of the collet section 10
A part 11a is formed in 1, and a corresponding part 11a is formed.
・Since the size of the hole 8a of the presser foot 8 has enough clearance, the hole 8a of the presser foot 8
This is good because it can be automatically aligned according to the rotation of the knob b, the pressing force of the knob holder 8 can be stably transmitted to the knob receiver 6, and the rotating surface of the magnetic disk 4a can also be stabilized. performance.

In addition, since the pressing force on the knob receiver 6 is applied by the hub holder 8 made of a plate or the like, it can be made small and thin, and since it does not come into contact with the control board, the area of the control board can be effectively used. The strength can also be improved since the amount can be reduced. Furthermore, the height of the entire device can be reduced.

The magnetic disk cassette 4 can also be prevented from popping out by the protrusions 8b provided on both sides of the hub holder 80.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the present invention, and FIGS. 2 and 3 are detailed views of the main parts. 4... Magnetic tape cassette, 7... Cassette storage body, 4a... Magnetic disk, 4b... No-pu, 6...
... Knob holder, 8... Knob presser, 10... Collet part, 8b... Fly-out prevention No. 2 Diagram 3 Eye 5 Procedural amendment (method) □,! +n 5 η sound 2 d Mr. Kazuo Wakasugi, Director-General of the Contracting Agency (Display of '1-' 1988 Patent [fiff No. 140746 Name of the invention 6 Person who corrects the disk motion device □1・'1 above! Allow me to lean in!E 6<
5-1 Marunouchi-chome, Chiyoda-ku, Tokyo Name jj
, S:O Co., Ltd.)
3 1) Masato Katsu Shigeyo 11 Address: 5-1 Marunouchi-chome, Chiyo 1B-ku, Tokyo Supplementary document certifying HE's power of representation, application form,
Full text of specification and drawings

Claims (1)

[Scope of Claims] 1. A cassette storage body for storing a magnetic disk cassette, and a rotatable knob for placing a knob provided at the center of the magnetic disk built into the magnetic disk cassette. - In a magnetic disk sounding device comprising a push holder, a member for centering the magnetic disk, and a member for pressing and supporting the knob from above, a leaf spring identified at the top of the cassette storage body is provided. What is claimed is: 1. A magnetic disk drive device characterized in that a knob holder made of an elastic body such as the above is fixed, and a collet portion with a self-aligning structure is provided at a position corresponding to a position of a 7-brake holder at the tip of the hub holder. 2. In claim 1, there are provided protrusions on both sides of the hub holder to prevent the magnetic disk cassette from popping out when ejecting it;
A magnetic disk drive device equipped with a hub holder that forms the holder of an opener provided in a notch of a cassette storage body to open and close a shutter built into a magnetic disk drive center when inserted.