JPH0313902Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a disk support device for positioning and driving a small disk such as a 3.5-inch floppy disk. The present invention relates to a disk support device.

[Prior art]

9 and 10 show a disk support device provided in a conventional 3.5 inch floppy disk drive unit.

Reference numeral 1 in the figure is a rotational drive shaft. This rotary drive shaft 1 is rotationally driven by a brushless motor that rotates at a constant speed. A circular turntable 2 is fixed to the upper end 1a of the rotary drive shaft 1. Further, the upper end 1a of the rotary drive shaft 1 projects upward from the center of the turntable 2. The turntable 2 has a through hole 2a and a female screw hole 2b formed therein. The through hole 2a and the female threaded hole 2b are provided at symmetrical positions with the rotation drive shaft 1 as the center. A leaf spring 3 is installed on the bottom surface of the turntable 2. A notch 3a is formed in the center of this leaf spring 3,
A fixing hole 3b is bored at the base end of the leaf spring 3. Further, a positioning pin 4 is fixed to the tip of the leaf spring 3. The rotary drive shaft 1 is inserted into the notch 3a of the leaf spring 3. A fixing screw 5 is inserted into the fixing hole 3b and screwed into the female threaded hole 2b, and the base of the leaf spring 3 is fixed to the lower surface of the turntable 2. The positioning pin 4 projects upward from the turntable 2 from the through hole 2a.

The conventional leaf spring 3 is deformed by the elastic force of the pair of arms 3c extending parallel to both sides of the notch 3a, and this deformation causes the positioning pin 4 to protrude from the upper surface of the turntable 2 and retract. It's becoming like that.

Figures 11 and 12 show the above disk support device.
The disk cartridge for a 3.5-inch floppy disk is shown loaded.

Reference numeral 6 indicates the floppy disk in the disk cartridge, and reference numeral 7 indicates the floppy disk 6.
It is a hub that is fixed in the center of the A support hole 8 is formed in the center of the hub 7, and a drive hole 9 is formed at a certain distance from the support hole 8. The drive hole 9 has a rectangular shape extending in the normal direction to the center of rotation of the hub 7.

As shown in FIG. 11, when the hub 7 is installed on the turntable 2 and the positioning pin 4 is at position a, the arm portion 3c of the leaf spring 3 is bent.
The positioning pin 4 is recessed from the upper surface of the disk 2. The turntable 2 is driven by a motor,
When the positioning pin 4 enters the drive hole 9 and reaches the position b, for example, the positioning pin 4 protrudes from the top surface of the turntable 2 due to the elastic force of the leaf spring 3 and enters the drive hole 9. When the turntable 2 further rotates, the outer surface 4a of the positioning pin 4 hits the outer side 9a of the drive hole 9. At this time, the arm portion 3c of the leaf spring 3 is slightly bent, and the outer surface 4a of the positioning pin 4 presses the outer edge 9a of the drive hole 9 in the radial direction, thereby positioning the hub 7 and the turntable 2 in the radial direction. and the centers of rotation of both coincide. When the turntable 2 further rotates, the positioning pin 4
The lateral surface 4b of the drive hole 9 contacts the lateral side 9b of the drive hole 9, and the hub 7 and the turntable 2 are positioned in the rotational direction.

In the floppy disk drive unit, the rotor position of the motor that drives the rotary drive shaft 1 is detected by a pulse generator or the like, and the rotational phase of the positioning pin 4 is detected. As mentioned above, hub 7
is positioned with respect to the turntable 2 in the radial and rotational directions, so the initial position for recording and reproduction can be accurately set by recording an index signal or the like according to the phase detection. This ensures the accuracy of disc recording and playback and disc compatibility.

[Problem that the invention attempts to solve]

As mentioned above, in the disk support device in this type of floppy disk drive unit, the first
As shown in Figure 1, the hub 7 and the turntable 2 are positioned on the assumption that the turntable 2 rotates and the positioning pin 4 moves from the position b to the position c. There is.

However, as a practical condition for using the floppy disk drive unit, the recording or reproducing operation is stopped while the disk is being driven, that is, with the positioning pin 4 at position c and the hub 7 positioned. The rotation of the rotary drive shaft 1 may stop. At this time, if you take out the disk cartridge during the next recording/playback operation, then immediately load the same disk cartridge and try to continue the recording/playback operation, the hub 7 will be driven without being accurately positioned. The phenomenon of starting may occur. That is, when the positioning pin 4 is at position c in FIG. 11, the arm portion 3c of the leaf spring 3 is slightly bent, and the positioning pin 4 is pressed against the outer side 9a of the drive hole 9. Therefore, if the disk cartridge is taken out at this time, the positioning pin 4 will move slightly radially outward due to the restoring force of the leaf spring 3. Immediately after this, when the same disk cartridge is loaded again, as shown in FIG.
will be slightly displaced outward from the outer edge 9a of the drive hole 9. Therefore, the positioning pin 4 is pushed by the hub 7 from above and retracts downward from the top surface of the turntable 2. (See Figure 14). Let us focus on the deformation of the leaf spring 3 at this time. When the positioning pin 4 is pushed from above, the arms 3c on both sides of the leaf spring 3
will deflect evenly in the thickness direction, and will not deflect much in the torsional direction. That is, when the positioning pin 4 is pushed downward by the hub 7, the leaf spring 3
As shown in the figure, it simply bends downward,
The positioning pin 4 is unilaterally tilted in the radial direction by the same angle α as the deflection angle of the leaf spring 3.
As a result, the inner circumferential top portion 4c of the positioning pin 4 enters into the drive hole 9, as shown in FIG. When the power is turned on and the turntable 2 begins to rotate in this state, the inner circumferential top portion 4c of the positioning pin 4 pushes the horizontal side 9b of the drive hole 9, and the hub 7 is driven in the state shown in FIG. In other words, the hub 7 is driven without being accurately positioned with respect to the turntable 2. Therefore, errors occur in the tracking of the floppy disk 6 by the magnetic head, which causes problems in recording and reproducing operations.

This invention solves the above-mentioned conventional problems, and even if a disk cartridge is taken out and reloaded while the hub is positioned on the turntable, the turntable will not be damaged. To provide a disk support device in which a hub is immediately and accurately positioned with respect to a turntable by rotation of the disk, and tracking failures and the like do not occur.

[Structure of the idea to solve the problem]

In this invention, the turntable is fixed to the rotational drive shaft, the tip of the rotational drive shaft is protruded from the top surface of the turntable, and a positioning pin is attached to the leaf spring installed on the bottom surface of the turntable. In the disk support device in which the positioning pin is fixedly installed and the positioning pin protrudes from the upper surface of the turntable, the leaf spring is formed with an arm portion extending in a direction away from the rotational drive shaft and further extending in a direction surrounding the rotational drive shaft. The positioning pin is fixed to a portion of the arm extending in a direction surrounding the rotational drive shaft.

[Effect of invention]

In this invention, when the locating pin is pushed by the hub at the center of the disk, the shape of the arm of the leaf spring allows the locating pin to tilt in the radial direction and rotate instead of tilting only in the radial direction. It tilts in the combined direction with the tilt in the circumferential direction. Therefore, even if the disk drive is stopped, the disk is taken out, and the disk is reloaded in the same state immediately after, resulting in the state shown in Fig. 13, the top of the periphery of the positioning pin will not engage with the drive hole of the hub. This prevents the hub from being rotated without being positioned on the turntable.

[Example of idea]

Embodiments of the present invention will be described below with reference to the drawings of FIGS. 1 to 8.

FIG. 1 is a partially sectional perspective view showing an assembled disk support device according to the present invention, and FIG. 2 is an exploded perspective view thereof.

Similar to those shown in FIGS. 9 and 10, a turntable 12 is fixed to the tip of a rotary drive shaft 11 driven by a brushless motor rotating at a constant speed. 11a projects upward from the center of the turntable 12. Further, the turntable 12 is formed with a through hole 12a and a female screw hole 12b.

A leaf spring 13 is attached to the lower surface of the turntable 12. As shown in FIGS. 2 and 3 (plan view), the leaf spring 13 is provided with a notch 13a in the center, and the rotary drive shaft 11 is inserted into the notch 13a. A fixing hole 13b is formed at the base end of the leaf spring 13, and a fixing screw 15 inserted into the fixing hole 13b is screwed into the female threaded hole 12b of the turntable 12, thereby fixing the leaf spring 13. An arm portion 13c is formed at the tip of the leaf spring 13. This arm portion 13c is approximately C-shaped,
It consists of a section A that extends from the inside of the turntable 12 toward the peripheral edge (direction away from the drive shaft 11), and a section B that continues from the tip and extends in a direction surrounding the rotary drive shaft 11. The tip of this portion B is a free end 13d. A positioning pin 14 is fixed to the B portion of this arm portion 13c. When the leaf spring 13 is fixed to the lower surface of the turntable 12, the positioning pin 14 protrudes from the through hole 12a of the turntable 12 toward the upper surface. As shown in FIG. 3, the fixing portion (fixing hole 13b) formed by the positioning pin 14 and the fixing screw 15 is arranged at a symmetrical position with respect to the rotary drive shaft 11. As shown in FIG.

The hub 7 loaded on this turntable 12
Similar to the one shown in FIG. 11, a support hole 8 is bored in the center, and a rectangular drive hole 9 is bored in a position apart from this (see FIG. 7).

Next, the driving operation will be explained.

Normally, when the hub 7 is installed on the turntable 12 and the turntable 12 starts rotating, the positioning pin 14 moves from the position a to the position b shown in FIG.
and enters the drive hole 9 of the hub 7. Then, when the positioning pin 14 reaches the position c, the leaf spring 13 causes the positioning pin 14 to bend slightly.
is pushed radially outward by. The outer surface of the positioning pin 14 is pressed against the outer edge 9a of the drive hole 9, thereby positioning the hub 7 in the radial direction, and the rotation centers of the turntable 12 and the hub 7 coincide. Furthermore, the lateral surface of the positioning pin 14 comes into contact with the lateral side 9b of the drive hole 9, thereby positioning the hub 7 in the rotational direction.

However, under actual usage conditions, positioning pin 1
4 is at position c in FIG. 11 and the hub 7 is properly positioned, the rotation of the turntable 12 may be stopped and the disk cartridge may be taken out in this state. At this time, as shown in FIG. 7 (same as FIG. 13), the positioning pin 14 moves radially outward due to the return of the slightly bent leaf spring 13. Therefore, when the same disk cartridge is loaded again immediately after that, the outer surface 14a of the positioning pin 14 comes off the drive hole 9, is pushed by the lower surface of the hub 7, and is pushed into the through hole 12a of the turntable 12. Regress to.

Here, as shown in FIG. 3, the arm portion 13c of the leaf spring 13 is formed into a substantially C shape consisting of a portion A and a portion B. Therefore, when the positioning pin 14 is pushed from above, the arm portion 13c Of 13c, part A is first bent by an angle β (see Figure 4) from the position of the curved point A (or a position near this), and at the same time, part B is bent by an angle γ (see Figure 6) from the position of the curved point B. It will bend only. Therefore, the positioning pin 14
The direction of deflection of part A and part B of c, that is, the deflection angle β
and γ are tilted in the direction in which they are combined.

Therefore, the positioning pin 14 is moved a certain distance l.
(See Figure 4), the deflection of part A and the deflection of part B are combined, so the deflection angle β of part A at this time is different from that of the conventional leaf spring 3 shown in No. 10. Therefore, the deflection angle in the same direction is smaller than the angle of deflection in the same direction when the positioning pin is retracted by the same distance l. In other words, in the case of the conventional leaf spring 3, the pair of parallel arms 3c bends downward uniformly, and the positioning pin 4 falls unilaterally only in the radial direction. As shown in the comparison diagram), the inclination angle α of the positioning pin 4 (that is, the deflection angle of the leaf spring 3) when the positioning pin 4 is retracted by a distance of l is the radius of the positioning pin 4 due to the leaf spring 13 of the present invention. It becomes larger than the angle of inclination β in the direction. Conversely, in the present invention, when the positioning pin 14 is retracted downward by l, the angle of inclination β in the radial direction is smaller than the angle of inclination α in the same direction in the case of the conventional leaf spring 3. .

In this way, when the positioning pin 14 is pushed by the hub 7 and retracts, the tilting angle β in the radial direction becomes small, and as shown in FIG. When the angle γ is tilted in the direction of , the positioning pin 14 is at position c as shown in FIG. When the positioning pin 17 is pushed by the hub 7, the amount and angle at which the outer circumferential top portion 14a of the positioning pin 17 enters into the drive hole 9 are very shallow (see FIG. 8). Therefore, even if the turntable 12 starts to rotate thereafter, the outer circumferential top 14a of the positioning pin 14 does not touch the horizontal side 9b of the drive hole 9, and the B portion of the arm 13c is
direction (see FIG. 6), only the turntable 12 rotates without the hub 7 rotating.

Then, when the turntable 12 rotates once,
Positioning pin 1 in the same way as explained in FIG.
4 moves from position a to position b, completely enters into the drive hole 9, then reaches position c, and the hub 7
is perfectly positioned relative to the turntable 12. Then, in the positioned state, the hub 7 and the floppy disk 6 are driven to rotate.

[Effect of idea]

As described above, according to the present invention, the arm part is provided on the leaf spring, and the positioning pin is fixed to the part of the arm part that extends in the direction surrounding the rotational drive shaft, so that the positioning pin is not pushed by the hub. At this time, the positioning pin falls not only in the radial direction but also in the rotational circumferential direction. Therefore, even if the recording/reproducing operation is stopped, a disk is taken out, and the same disk is loaded immediately thereafter, the problem of the hub being driven without being positioned can be resolved.

[Brief explanation of the drawing]

1 to 8 show embodiments of the present invention; FIG. 1 is a perspective view showing a disk support device according to the present invention, including a partial cross section, and FIG. 2 is an exploded perspective view of the disk support device. 3 is a plan view of the leaf spring, FIGS. 4 and 6 are sectional views showing the deformed state of the arm portion of the leaf spring from each direction, and FIG. 5 is a conventional one for comparison with FIG. An imaginary side view showing the deformed state of the leaf spring, Fig. 7 is a plan view showing the case where the hub is loaded on the turntable in an incorrect state, and Fig. 8 shows the state of the positioning pin and drive hole at that time. The enlarged perspective views, FIGS. 9 to 15, show the prior art. FIG. 9 is a perspective view showing a conventional disk support device including a partial cross section, and FIG. 10 is an exploded perspective view thereof, and FIG. Figure 11 is a plan view showing the state in which the hub is loaded on the turntable, Figure 12 is a side view thereof, and Figure 13 is for explaining the problems of the present invention. 14 is a side view thereof, and FIG. 15 is an enlarged perspective view showing the state of the positioning pin and the drive hole of the hub in the case of FIG. 13. 6... Floppy disk, 7... Hub, 8...
...Support hole, 9...Drive hole, 11...Rotation drive shaft,
12... Turntable, 13... Leaf spring, 13
c... Arm portion of the leaf spring, A... Portion of the arm portion extending in a direction away from the rotational drive shaft, B... Portion of the arm portion extending in a direction surrounding the rotational drive shaft, 14...
Positioning pin.

Claims (1)

[Scope of utility model registration request] The turntable is fixed to the rotational drive shaft, the tip of the rotational drive shaft is protruded from the top surface of the turntable, and a positioning pin is fixed to a leaf spring installed on the bottom surface of the turntable. , in a disk support device in which this positioning pin protrudes from the top surface of the turntable,
The leaf spring is formed with an arm portion that extends in a direction away from the rotational drive shaft and further extends in a direction surrounding the rotational drive shaft. A disk support device characterized by having fixed pins.