JPH0652612A - Disk rotating drive device - Google Patents

Abstract

PURPOSE:To obtain a good disk chucking operation. CONSTITUTION:An extending part 67 is provided in an end part opposite to a pivotally supporting side of a chuck lever 65 to cover one part of an opening periphery of an opening window 63, and is provided with a pin 64 for regulating the movement of the chuck lever 65 between this extending part 67 and a turntable 61 and a guide hole 68 for guiding this pin 64. Consequently, the max. bending amt. of the chuck lever 65 can be diminished by the pin 64 at the disk chucking time, and even when the chuck lever 65 is bent downward, interference between a mechanism underneath the turntable 61 and a chuck pin 69 of the chuck lever 65 can be prevented, and the turning operation of the chuck lever 65 can smoothly be performed.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art Disk devices such as floppy disk devices are widely used in office computers, word processors, etc., including personal computers, and their spread is remarkable.

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

This will be described with reference to FIG. 1. In FIG. 1, reference numeral 1 is a chassis in which a spindle motor shaft 2 as a disk rotation center faces the inside thereof. (Not shown)
It is housed inside, and is entirely formed by a bottomed box that has a storage space 1a that is open to the front and that faces the disk cartridge 3. On the rear right side of the bottom surface of the chassis 1, a holding wall 4 having a through hole 4a opening in the front-rear direction and a support shaft 5 juxtaposed with the holding wall 4 at a predetermined interval.
Is provided upright, and two spring engaging pieces 6 are juxtaposed at the front end portion in parallel with each other at a predetermined interval in the left-right direction. Further, on both side walls of the chassis 1, a guide groove (only the two left guide grooves are shown) 7 extending in the vertical direction is integrally provided.

Reference numerals 8 and 9 denote two pairs of protrusions arranged in parallel with each other in the front-rear direction at a predetermined interval, which are attached to the bottom surface of the chassis 1 and configured to guide a slide plate described later in the front-rear direction. There is. These pairs of stems 8 and 9
Are juxtaposed with each other at a predetermined interval in the left-right direction. Of these, the rear protrusion 9 has a conical cartridge positioning portion 9a whose outer diameter decreases toward the tip.
Is provided.

A reference numeral 10 designates a U-shaped slide plate in cross section, which has an eject button 11 for ejecting a disk cartridge on the right side of the front end edge thereof, and a U-shaped notch 12a in plan view which the spindle motor shaft 2 faces and the above-mentioned. The chassis 1 includes a bottom plate 12 having a first elongated hole 12b facing the spring locking piece 6 and two side plates 13 standing on both sides of the bottom plate 12 and facing each other with a predetermined gap.
It is installed inside so that it can move back and forth.

On the bottom plate 12 of the slide plate 10, a spring engaging member corresponding to the notch 14 and the second elongated hole 15 and the spring engaging piece 6 which both the protrusions 8 and 9 face and extend in the front-rear direction. A stop hole 16 is provided. A lock claw 17 protruding downward is attached to the rear edge of the bottom plate 14 of the slide plate 10.

On the other hand, the bottom plate 12 of the slide plate 10 is formed with four front, rear, left, and right cam grooves 18 having a slope that rises obliquely forward, and behind these cam grooves 18, the cam grooves 18 extend in the front-rear direction. An 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 to the spring locking pieces 6 and the spring locking holes 16, respectively.

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

Reference numeral 23 is a torsion spring that urges the trigger arm 21 to rotate in a direction in which the slide plate 10 is locked. A winding portion is provided around the support shaft 5, and both ends thereof are the protrusions. 22a and the holding wall 4 are engaged.

A stepping motor 24 for feeding the head carriage is fixed to the rear end portion of the chassis 1. The output shaft 25 of the stepping motor 24 is formed by a lead screw rod that extends in the front-rear direction and has a spiral V-shaped groove 25a, and a tip portion of the output shaft 25 is provided in a through hole 4a of the holding wall 4 (see FIG. (Not shown).

Reference numeral 26 is a guide rod extending in the front-rear direction, which is held in the rear center of the chassis 1 and is configured to guide the head carriage, which will be described later, in the front-rear direction.

27 is a needle pin 2 projecting obliquely rearward
8 and a head carriage having a leaf spring 29 that presses the needle pin 28 into the V-shaped groove 25a of the output shaft 25. There is. A first head 30 for reading recorded information on the disc is held at the tip of the head carriage 27, and a head arm 32 having a second head 31 corresponding to the first head 30 at the rear upper end. Is attached via an elastic body 33 so as to be swingable. The head arm 32 is rotationally biased by a torsion spring 34 in a direction in which the second head 31 approaches the first head 30,
A stopper 32a for laterally projecting the arm rotation is integrally provided on one side edge.

Reference numeral 36 denotes a cartridge holder that holds the disc cartridge 3 so that the disc cartridge 3 can be inserted and removed. The cartridge holder 36 is provided in the slide plate 10 so as to be movable up and down. Rollers 37 as convex portions facing the cam grooves 18 and the guide grooves 7 are rotatably held at both side ends of the cartridge holder 36, and the upper end portion is open at both side edges at one side edge. A cut-and-raised piece 38 having a locking hole 38a is provided. The cartridge holder 36 is
By pressing the disk cartridge 3 against the arm operator 22, the lock claw 17 and the engaging surface 21
a is disengaged and the slide plate 10 moves forward to approach the bottom plate 12, while the eject button 1
It is configured to be separated from the bottom plate 12 by the rearward movement of the slide plate 10 by pressing 1.

Reference numeral 39 denotes an arm for opening and closing the shutter 3a of the disc cartridge 3, which is rotatably provided at the rear side edge of the upper end portion of the holder 36. A locking piece 40 protruding upward is integrally formed with the arm 39.

Reference numeral 41 is a coil spring for tensioning which gives the arm 39 a habit of returning, and both ends thereof are the locking pieces 4.
0 and is locked in the locking hole 38a.

Reference numerals 42 and 43 denote types of the disk D (2D
D, 2HD, 2ED) switch and disk D
Is a switch for detecting whether writing is possible, and is installed on the chassis 1 via a substrate 44.

Reference numeral 45 designates a gear 46 which meshes with the rack 19.
And a reduction gear mechanism having a rear end portion side edge of the chassis 1.

Numerals 47 and 48 are positioning recesses provided in the case 3b of the disk cartridge 3 into and out of which the respective cartridge positioning parts 9a come in and out.

The reference numeral 49 in the drawing indicates a substantially square insertion hole 49a in a plan view, which is attached to a substantially central portion of the disk D and which is seen by the tip end of the spindle motor shaft 2 and the chuck pin 50 when the disk is chucked. The disk hub has a rectangular positioning hole 49b.

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

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

This will be described with reference to the same figure. In the figure, reference numeral 51 indicates a spindle motor shaft 52.
A turntable having a magnet 53 for adsorbing a disk hub and an opening window 54 for releasing a chuck pin, which is fixedly inserted into the rotary table 55, is rotatably supported by the turntable 51 via a support shaft 56, and the opening window 54 and the positioning are provided. The chuck lever is an elastically deformable chuck lever having a driving roller 57 as a chuck pin capable of projecting in and out of the hole 49b at its tip.

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

In the disk chucking of the disk rotation driving device constructed as described above, the disk cartridge 3 is used.
Is moved to the disc loading position and the spindle motor shaft 52 is rotated.

At this time, the respective tip portions of the spindle motor shaft 52 and the drive roller 57 are brought into pressure contact with the inner surfaces of the two openings that face the insertion hole 49a and the positioning hole 49b of the disk hub 49 and are adjacent to each other.

Here, the drive roller 57 and the positioning hole 49
When the positions of b are displaced 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 bends as shown by the chain double-dashed line in FIG. After that, when the spindle motor shaft 2 starts to rotate, the disk D moves to the first head 30 and the second head.
Since the head 31 is in a stationary state due to the retaining force of the pressure,
The turntable 51 rotates relative to the disk hub 49, and when the positions of the drive roller 57 and the positioning hole 47b coincide, the chuck lever 55 is restored as shown by the solid line in FIG. Is the positioning hole 4
Face 9b.

[0029]

However, in the conventional disk rotation driving device, since the chuck lever 55 is supported by the turntable 51 in a cantilevered manner, the other end of the disk is driven by the bending of the chuck lever 55 during chucking of the disk. (Free end) is largely displaced below the turntable 51, and the chuck pin 56 is moved to the turntable 51.
It was made easy to interfere with the mechanism below (for example, a coil winding part). As a result, there has been a problem that the turning operation of the chuck lever 55 is hindered and a good disk chucking operation cannot be obtained.

The present invention has been made in view of the above circumstances, and provides a disk rotation drive device capable of smoothly performing a turning operation of a chuck lever and thereby obtaining a good disk chucking operation. To do.

[0031]

DISCLOSURE OF THE INVENTION A disk rotation drive device according to the present invention includes a turntable which is inserted and fixed to a motor shaft and has a magnet for attracting a disk hub and an opening window for releasing a pin, and a turntable which rotates on the turntable. An elastically deformable lever having a chuck pin that is freely pivotally supported and that can move in and out of the opening window, and an extension portion that covers a part of the opening edge of the opening window at an end portion of the lever on the side opposite to the pivot support. Is provided
A protrusion for restricting movement of the lever and a guide hole for guiding the protrusion are provided between the extending portion and the turntable.

[0032]

According to the present invention, the maximum deflection of the chuck lever can be reduced by the protrusion when the disk is chucked.

[0033]

Embodiments of the present invention will be described in detail below with reference to embodiments shown in the drawings.

1 (A) and 1 (B) are a plan view and a sectional view showing a main part of a disk rotation drive device according to the present invention, and FIG.
Is a perspective view showing a chuck lever of the disk rotation driving device according to the present invention. In FIG. 3, the same members as those in FIG. 3 or FIGS. Omit it.

In the figure, reference numeral 61 is a turntable having a magnet 62 for attracting a disk hub and an opening window 63 for releasing a chuck pin, which is fixedly inserted through the spindle motor shaft 52 and is attached to the spindle motor ( It is configured to rotate at high speed (not shown).

Reference numeral 64 denotes a pin as a projecting member having a circular cross section having a flange 64a facing the opening edge of the opening window 63 at the upper end thereof, which is provided on the turntable 61 and which will be described later with a chuck lever. Is configured to regulate the upward movement of the.

Reference numeral 65 denotes an elastically deformable chuck lever having a circular arc shape in a plan view, which is rotatably supported by the turntable 61 via a support shaft 66, and the opening is formed at the end portion of the lever opposite pivot support side. The extended portion 67 that covers a part of the opening edge of the window 63
Are provided integrally. The extension portion 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 arcuate through hole that is open at both upper and lower end surfaces and has the support shaft 66 as a center.

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

Reference numeral 69 is a drive roller 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.
It is configured so that it can appear inside and outside b.

In the disk rotation driving device having such a structure, the maximum bending amount of the chuck lever 65 can be reduced by the pin 64 at the time of disk chucking.

Therefore, in this embodiment, even if the chuck lever 65 bends downward, it is possible to prevent the mechanism (not shown) below the turntable 61 from interfering with the drive roller 69 of the chuck lever 65. Therefore, the turning operation of the chuck lever 65 can be smoothly performed.

Next, the disk chucking of the disk rotation driving device in this embodiment will be described.

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

At this time, the respective tip portions of the spindle motor shaft 52 and the drive roller 69 face the insides of the insertion hole 49a and the positioning hole 49b of the disk hub 49 and are pressed against the inner surfaces of two openings adjacent to each other.

Here, the drive roller 69 and the positioning hole 49
When the respective positions of b are displaced from each other, the magnet 62 attracts the disk hub 49 onto the disk mounting surface of the turntable 61, so that the chuck lever 65 moves vertically by the pin 64 and the turntable 61. While being regulated, FIG.
It bends as shown by a two-dot chain line in (B). After that, when the spindle motor shaft 52 starts to rotate, the disk D becomes the first disk.
Since the head 30 and the second head 31 are in a stationary state due to the holding force of the pressure, the turntable 61 rotates relative to the disk hub 49, and when the driving roller 69 and the positioning hole 49b are aligned with each other, the chuck is performed. The lever 65 is restored as shown by the solid line in FIG. 1B so that the drive roller 69 faces the positioning hole 49b.

In the present 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, and the disk of the turntable 61 is not limited to this. Even if it is provided on the non-mounting surface side (motor side), the same effect as that of the embodiment is achieved.

[0047]

As described above, according to the present invention, there is provided a turntable having a magnet for disk hub attraction and an opening window for pin escape, which is inserted and fixed to a motor shaft, and a pivot table which is rotatably pivoted on the turntable. An elastically deformable lever having a chuck pin that is supported and is capable of appearing in and out of the opening window, and an extending portion that covers a part of the opening edge of the opening window is provided at an end portion of the lever that is on the opposite pivotal support side. Since the protrusion that restricts the movement of the lever and the guide hole that guides the protrusion are provided between the extending portion and the turntable, the maximum deflection amount of the lever can be reduced by the protrusion during disk chucking. .

Therefore, even if the lever bends downward, it is possible to prevent the mechanism below the turntable from interfering with the chuck pin of the lever, so that the turning operation of the lever can be performed smoothly, and a good disk chuck can be performed. You can get a king action.

[Brief description of drawings]

1A and 1B are a plan view and a cross-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 a disc device.

FIG. 4 is a plan view and a cross-sectional view showing a conventional disk rotation drive device.

[Explanation of symbols]

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

Claims (3)

[Claims] 1. A turntable which is inserted and fixed to a motor shaft and which has a magnet for attracting a disk hub and an opening window for releasing a chuck pin, and a turntable which is rotatably supported by the turntable so that it can appear in and out of the opening window. An elastically deformable chuck lever having a different chuck pin,
An extension portion is provided at an end portion of the chuck lever on the side of the pivotal support so as to cover a part of the opening edge of the opening window, and a protrusion for restricting movement of the chuck lever between the extension portion and the turntable. A disk rotation drive device characterized in that a guide hole for guiding the protrusion is provided. 2. The disk rotation drive device according to claim 1, wherein the chuck lever is positioned on the disk mounting surface side of the turntable. 3. The disk rotation drive device according to claim 1, wherein the chuck lever is positioned on the side opposite to the disk mounting surface side of the turntable.