JP3161063B2 - Disk rotation drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk rotation drive suitable for use in, for example, a floppy disk drive.

[0002]

2. Description of the Related Art Disk devices such as floppy disk devices are widely used in personal computers, office computers, word processors and the like, and their use has been remarkable.

Conventionally, this type of disk device is configured, for example, as shown in FIG.

Referring to FIG. 1, reference numeral 1 denotes a chassis in which a spindle motor shaft 2 serving as a disk rotation center faces the inside thereof. Not shown)
And is entirely formed by a bottomed box having a storage space 1a that opens forward and has a storage space 1a facing the disk cartridge 3. A holding wall 4 having a through hole 4a opening in the front-rear direction and a support shaft 5 arranged in parallel with the holding wall 4 at a predetermined interval are provided on the right rear side of the bottom surface of the chassis 1.
The front end portion is provided with two spring engaging pieces 6 which are arranged in parallel in the left-right direction at a predetermined interval. In addition, guide grooves (only the two left guide grooves are shown) 7 extending vertically are integrally provided on both side walls of the chassis 1.

[0005] Reference numerals 8 and 9 denote two pairs of protrusions arranged in parallel in the front-rear direction at a predetermined interval, which are mounted on the bottom surface of the chassis 1 and are configured to guide a slide plate described later in the front-rear direction. I have. Protrusions 8 and 9 of each pair
Are arranged side by side at predetermined intervals in the left-right direction. Among them, a conical cartridge positioning portion 9a whose outer diameter decreases toward the front end is provided on the rear projection 9.
Is provided.

Reference numeral 10 denotes a U-shaped slide plate having a U-shaped cross-section plate having an eject button 11 for ejecting a disc cartridge on the right side of the front end thereof, and a U-shaped notch 12a in plan view facing the spindle motor shaft 2. The chassis 1 comprises a bottom plate 12 having a first elongated hole 12b in which the spring engaging piece 6 faces, and two side plates 13 erected on both sides of the bottom plate 12 and facing each other at a predetermined interval.
It is provided to be able to advance and retreat inside.

On the bottom plate 12 of the slide plate 10, the notches 14 and the second elongated holes 15 in which the two projections 8, 9 face and extend in the front-rear direction correspond to the spring engaging pieces 6, respectively. A stop hole 16 is provided. A lock claw 17 projecting downward is attached to the rear edge of the bottom plate 14 of the slide plate 10.

The bottom plate 12 of the slide plate 10 is formed with four front, rear, right and left cam grooves 18 having a gradient that goes up obliquely forward, and extends behind the cam grooves 18 in the front and rear direction. Existing rack 19 is provided.

Reference numeral 20 denotes two tension coil springs for urging the slide plate 10 forward, and both ends thereof are locked by the respective spring locking pieces 6 and the respective spring locking holes 16.

Reference numeral 21 denotes a trigger arm having an engaging surface 21a and a guide surface 21b corresponding to the lock pawl 17, which is rotatably provided on the support shaft 5, and has a spring projecting laterally on an upper end surface. An arm operator 22 having a locking projection 22a is provided integrally.

Reference numeral 23 denotes a torsion spring for urging the trigger arm 21 to rotate in a direction for locking the slide plate 10. A torsion spring is provided around the support shaft 5, and both ends are provided with the protrusion. 22a and the holding wall 4.

Reference numeral 24 denotes a stepping motor for feeding the head carriage, which is fixed to the rear end of the chassis 1. The output shaft 25 of the stepping motor 24 is formed by a lead screw rod extending in the front-rear direction and having a spiral V-shaped groove 25a. (Not shown).

A guide bar 26 extends in the front-rear direction and is held at the rear center of the chassis 1 so as to guide a head carriage, described later, in the front-rear direction.

Reference numeral 27 denotes a needle pin 2 projecting obliquely rearward.
8 and a head carriage having a leaf spring 29 for pressing the needle pin 28 into the V-shaped groove 25a of the output shaft 25. The head carriage is inserted through the guide rod 26 so as to be able to advance and retreat, and is provided above the chassis 1. I have. A first head 30 for reading recorded information on a disk is held at a tip end of the head carriage 27, and a head arm 32 having a second head 31 corresponding to the first head 30 is provided at a rear upper end. Is swingably attached via an elastic body 33. The head arm 32 is urged to rotate by a torsion spring 34 in a direction in which the second head 31 approaches the first head 30.
On one side edge, a stopper 32a for restricting the rotation of the arm protruding laterally is provided integrally.

Reference numeral 36 denotes a cartridge holder for holding the disc cartridge 3 so as to be freely inserted and removed, and is provided in the slide plate 10 so as to be able to move up and down. A roller 37 as a convex portion facing the cam groove 18 and the guide groove 7 is rotatably held at both side ends of the cartridge holder 36, and is opened on both sides at one side edge of the upper end portion. A cut-and-raised piece 38 having a locking hole 38a is provided. And this cartridge holder 36
The lock pawl 17 and the engaging surface 21 are pressed by the pressing of the disk cartridge 3 against the arm operating member 22.
a is disengaged and approaches the bottom plate 12 by the forward movement of the slide plate 10, while the eject button 1
The slide plate 10 is configured to be separated from the bottom plate 12 by the rearward movement of the slide plate 10 due to the pressing of 1.

Reference numeral 39 denotes an arm for opening and closing the shutter 3a of the disk cartridge 3. The arm 39 is rotatably provided on the rear side edge of the upper end of the holder 36. The arm 39 is integrally formed with a locking piece 40 projecting upward.

Reference numeral 41 denotes a tension coil spring for giving the arm 39 a return behavior.
0 and locked in the locking hole 38a.

Reference numerals 42 and 43 indicate the type of the disk D (2D
D, 2HD, 2ED) and disk D
The switch detects whether writing is possible or not, and is installed on the chassis 1 via the substrate 44.

A gear 46 meshes with the rack 19.
The reduction gear mechanism has a rear end portion of the chassis 1.

Reference numerals 47 and 48 denote positioning recesses provided in the case 3b of the disk cartridge 3 and into and out of which the cartridge positioning portions 9a enter and exit.

Reference numeral 49 in the drawing denotes a substantially square insertion hole 49a in a plan view, which is attached to a substantially central portion of the disc D and faces the tip end of the spindle motor shaft 2 and the chuck pin 50 during disc chucking. This is a disk hub having a rectangular positioning hole 49b.

By the way, this type of disk drive is provided with a disk rotation drive for rotating the disk D of the disk cartridge 3.

This is disclosed, for example, in Japanese Patent Application Laid-Open No. 61-9866 as a "magnetic disk drive".
It is configured as shown in (A) and (B).

This will be described with reference to FIG. 2. In FIG.
The turntable 55 is inserted through and fixed to the disc, and has a magnet 53 for attracting the disk hub and an opening window 54 for releasing the chuck pin. The turntable 55 is rotatably supported by the turntable 51 via a support shaft 56 and the opening window 54 and the positioning. The chuck lever is a resiliently deformable chuck lever having a driving roller 57 as a chuck pin which can be inserted into and retracted from the inside of the hole 49b.

The chuck lever 55 is urged to rotate away from the spindle motor shaft 52 by a spring (not shown).

The disk chucking of the disk rotation driving device having the above construction is performed by the disk cartridge 3
Is moved to the disk loading position to rotate the spindle motor shaft 52.

At this time, the respective distal ends of the spindle motor shaft 52 and the drive roller 57 face the insertion hole 49a and the positioning hole 49b of the disk hub 49 and are pressed against two adjacent inner surfaces of the opening.

Here, the driving roller 57 and the positioning hole 49
If the positions b are shifted from each other, the disk hub 49 is attracted to the disk mounting surface of the turntable 51 by the magnet 53.
As a result, the chuck lever 55 is bent as shown by a two-dot chain line in FIG. Thereafter, when the spindle motor shaft 2 starts rotating, the disk D is moved to the first head 30 and the second head 30.
Because the head 31 is stationary due to the holding force of the head 31,
The turntable 51 rotates relative to the disk hub 49, and when the position of the drive roller 57 and the positioning hole 47b match, the chuck lever 55 is restored as shown by a solid line in FIG. Is positioning hole 4
Face 9b.

[0029]

However, in the conventional disk rotation driving device, since the chuck lever 55 is cantileveredly supported on the turntable 51, the other end portion is bent by the bending of the chuck lever 55 during disk chucking. (Free end) is largely displaced below the turntable 51, and the chuck pin 56 is
This tends to interfere with the lower mechanism (for example, the coil winding part). As a result, there has been a problem that the rotation operation of the chuck lever 55 is hindered, and a good disc chucking operation cannot be obtained.

The present invention has been made in view of such circumstances, and provides a disk rotation drive device that can smoothly perform a rotation operation of a chuck lever and can thereby obtain a good disk chucking operation. Is what you do.

[0031]

Disk rotating apparatus of the present invention SUMMARY OF THE INVENTION comprises a turntable having been inserted and fixed to the motor shaft apertures window for relief Ma Gunetto and the chuck pin disc hub adsorption, the turntable e Bei an elastically deformable arc-shaped tea <br/> Kkureba end support shaft which is provided with a pivotally supported by the chuck pins retractable into and out of the opening window, the arcuate chuck lever has a extending portion having an arcuate guide hole along its arc shape at the other end integrally the chuck lever and engage the arcuate guide hole of the extending portion chuck levers extending in the turntable A protrusion that regulates the movement of the part in the arc direction ,
The bending amount of the chuck lever is limited .

[0032]

According to the present invention, the maximum deflection of the chuck lever can be reduced by the projection during disk chucking.

[0033]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction of the present invention will be described below in detail with reference to the embodiments shown in the drawings.

FIGS. 1A and 1B are a plan view and a sectional view, respectively, showing a main part of a disk rotation drive device according to the present invention.
3 is a perspective view showing a chuck lever of the disk rotation drive device according to the present invention. In FIG. 3, the same members as those shown in FIG. 3 or FIGS. Omitted.

In the figure, reference numeral 61 denotes a turntable having a magnet 62 for attracting a disk hub and an opening window 63 for releasing a chuck pin, which is inserted and fixed to the spindle motor shaft 52, and is provided with a spindle motor ( (Not shown) so as to rotate at a high speed.

Numeral 64 denotes a pin as a projection having a circular shape in a sectional view having a flange 64a facing the opening edge of the opening window 63 at an upper end thereof, and is provided on the turntable 61 and has a chuck lever described later. Is configured to restrict the upward movement of.

Numeral 65 is a chuck lever which is elastically deformable in an arc shape in a plan view and is rotatably supported on the turntable 61 via a support shaft 66. Extension 67 that covers part of the opening edge of window 63
Are provided integrally. The extension 67 of the chuck lever 65 is provided with a guide hole 68 for guiding the pin 64. The guide hole 68 is formed by an arc-shaped through hole which is opened at both upper and lower end surfaces and centered on the support shaft 66.

The chuck lever 65 is urged to rotate away from the spindle motor shaft 52 by a spring (not shown) similarly to the chuck lever 55.

Reference numeral 69 denotes a driving roller serving as a chuck pin, which is provided substantially at the center of the upper end surface of the chuck lever 65, and has the opening window 63 and the positioning hole 49.
b.

In the disk rotation drive device configured as described above, the maximum bending amount of the chuck lever 65 can be reduced by the pins 64 during disk chucking.

Therefore, in this embodiment, even if the chuck lever 65 is bent downward, interference between the mechanism (not shown) below the turntable 61 and the driving roller 69 of the chuck lever 65 can be prevented. Therefore, the turning operation of the chuck lever 65 can be performed smoothly.

Next, the disk chucking of the disk rotation drive device according to the present embodiment will be described.

That is, chucking of the disk D with respect to the turntable 61 is performed by moving the disk cartridge 3 to the disk loading position and rotating the spindle motor shaft 52.

At this time, the respective ends of the spindle motor shaft 52 and the drive roller 69 face the insertion hole 49a and the positioning hole 49b of the disk hub 49, and are pressed against two adjacent inner surfaces of the opening.

Here, the driving roller 69 and the positioning hole 49
If the positions b are shifted from each other, the disk hub 49 is attracted to the disk mounting surface of the turntable 61 by the magnet 62, so that the chuck lever 65 is moved vertically by the pin 64 and the turntable 61. While being regulated, FIG.
It bends as shown by the two-dot chain line in FIG. Thereafter, when the spindle motor shaft 52 starts rotating, the disk D is moved to the first position.
Since the head 30 and the second head 31 are stationary due to the pressure holding force, the turntable 61 rotates relatively to the disk hub 49, and when the positions of the drive roller 69 and the positioning holes 49b coincide, the chuck is rotated. The lever 65 is restored as shown by the solid line in FIG. 7B, and the drive roller 69 faces the positioning hole 49b.

In this embodiment, the chuck lever 65 is provided on the disk mounting surface side of the turntable 61, but the present invention is not limited to this. The same effect as that of the embodiment can be obtained even when the device is provided on the side opposite to the mounting surface (motor side).

[0047]

As described above, according to the present invention, a turntable having a magnet for attracting a disk hub and an opening window for releasing a pin, which is inserted and fixed to a motor shaft, and pivotally pivotally connected to the turntable. An elastically deformable lever having a chuck pin that can be supported and retracted inside and outside of the opening window, and an extension portion that covers a part of the opening edge of the opening window is provided at the opposite pivotal end of the lever. Since a protrusion for restricting the movement of the lever and a guide hole for guiding the protrusion are provided between the extending portion and the turntable, the maximum bending amount of the lever can be reduced by the protrusion during disk chucking. .

Therefore, even if the lever bends downward, interference between the mechanism below the turntable and the chuck pin of the lever can be prevented, so that the operation of rotating the lever can be performed smoothly and a good disc chuck can be achieved. King action can be obtained.

[Brief description of the drawings]

FIGS. 1A and 1B are a plan view and a sectional view showing a main part of a disk rotation drive device according to the present invention.

FIG. 2 is a perspective view showing a chuck lever of the disk rotation drive device according to the present invention.

FIG. 3 is an exploded perspective view showing the disk device.

FIG. 4 is a plan view and a sectional view showing a conventional disk rotation driving device.

[Explanation of symbols]

 52 ... Spindle motor shaft 61 ... Turn table 62 ... Magnet 63 ... Opening window 64 ... Pin 65 ... Chuck lever 67 ... Extension part 68 ... Guide hole 69 ... Chuck pin

Claims (3)

(57) [Claims] 1. A turntable having an open port window for relief Ma Gunetto and the chuck pins for inserting fixed disk hub adsorbed on the motor shaft, one end on a support shaft provided on the turntable is pivotally supported the opening e Bei an elastically deformable arcuate chuck lever with chuck pins retractable into and out of the window, the arcuate chuck lever to the arc shape at the other end
Along had integrally extending portion having an arcuate guide hole, the arc direction to engage the arcuate guide hole of the chuck lever extending portion to the turntable chucking lever extending portion
To prevent the chuck lever from bending.
A disk rotation drive device having a limited amount . 2. The method of claim 1, chuck lever is positioned in the disk mounting face side of the turntable, the
The opening window is at least a central portion of the arc-shaped chuck lever.
A disk rotation drive device, wherein the disk drive is a circular arc opening that can be immersed . 3. The disk rotation driving device according to claim 1, wherein the chuck lever is positioned on a side of the turntable opposite to the disk mounting surface.