JPH0121549B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a rotational drive device used for rotationally driving a 3.5-inch floppy disk device or the like.

Configuration of conventional example and its problems Figure 1 shows a general floppy disk cassette.
Figures 2 a to c are views showing the state of engagement between a general floppy disk and a general rotary drive device, Figure 3 is an exploded perspective view of a conventional rotary drive device, and Figure 4 is a conventional rotary drive device. FIG. 5 is a sectional view taken along the line A-A' in FIG. 4, and FIG. 6 is a second conventional example of a leaf spring member. The configuration of this conventional example will be explained below with reference to FIGS. 1 to 6.

In FIGS. 1 to 6, 1 is a case for storing the floppy disk 2, 3 is a core metal joined to the center of the floppy disk 2, and 4 is a core metal 3.
5 is a position regulating pin insertion hole formed in the core metal 3. 6 is case 1
This hole 6 is for recording and reproducing data to and from the floppy disk 2 via a magnetic head (not shown). 7 is a motor shaft of a rotary drive device (described later) that is inserted into the motor shaft insertion hole 4; 8 is a position regulating pin of the rotary drive device that is inserted into the position regulating pin insertion hole 5; 9 is a rotation of this rotary drive device. It shows the direction. 10 is a brushless motor for rotating the floppy disk 2; 10a is formed in the brushless motor 10;
A hole 10b is formed in the brushless motor 10 for inserting the screw 11, and a hole 10c is a hole for inserting the screw 12. 10c is a hole for avoiding the screw 13.
0d is a hole for avoiding a position regulating pin 8 which will be described later. 10e is a protrusion formed around the motor shaft 7 joined to the center of the brushless motor 10;
f is a protrusion formed further around this protrusion 10e. A spacer 14 is assembled on the brushless motor 10, and a recess 14a of the spacer 14 is configured to fit into the protrusion 10f of the brushless motor 10. 14b to 14d are holes formed in the spacer 14, and these holes 14b
-14d are for inserting screws 11-13. 15 is a leaf spring material assembled on the spacer 14, and this leaf spring material 15 has an L-shaped arm 15.
a is formed, and a position regulating pin 8 is rotatably held in the center. Further, holes 15b to 15d are formed in this leaf spring material 15, into which screws 11 to 13 are inserted. 15e is brushless motor 10
This is a hole that fits into the protrusion 10f. 16 is a yoke that contacts the core metal 3 of the floppy disk;
A hole 16 into which the position regulating pin 8 is inserted is formed in the yoke 16, and a hole 16b into which the projection 10e of the brushless motor 10 fits is formed. A magnet 17 that magnetically attracts the core metal 3 is joined to the yoke 16, and holes 17b to 1 into which the screws 11 to 13 are screwed are formed.
7d is formed. 8a is the intermediate position when the position regulating pin 8 rotates in the B direction, 8b
In this case, the position regulating pin 8 further rotates in the direction B, and the position regulating pin 8 is inserted into the one end 5 of the position regulating pin insertion hole 5.
This is the position where it is in contact with a.

FIG. 5 shows the right half of the A-A′ cross section in FIG. ing.

FIG. 6 shows a second view of the leaf spring member 15 of FIG.
This is a conventional example. This leaf spring member 18 was developed in 1987.
− As detailed in Publication No. 102071,
A first bent part 18a and a second bent part 18b are formed at the end, and the position regulating pin 8 is configured to rotate about point c by pushing the position regulating pin 8. The screws 11 to 13 are inserted into the holes 18c to 18e, and the protrusion 10e is inserted into the hole 18f.
It fits into the

Next, the operation of the above conventional example will be explained. 1st
In Figures to Figures 6, the rotary drive device in Figure 3,
When the floppy disk cassette shown in FIG. 1 is placed, normally the position regulating pin 8 of the rotary drive device comes into contact with the core metal 3 of the floppy disk cassette as shown in FIG. 2a. Thereafter, as the brushless motor 10 rotates, the position regulating pin 8 is inserted into the position regulating pin insertion hole 5 as shown in FIG. 2b. When further rotated, the position regulating pin 8 comes to be located at the corner of the position regulating pin insertion hole 5 as shown in FIG. 2c, and the motor shaft 7 is also located at the corner of the motor shaft insertion hole 4. The rotation will continue in this state from now on.

However, the rotary drive device shown in FIG.
When the floppy disk cassette is placed in the position regulating pin insertion hole 5 while being caught on a part of the
The illustrated position regulating pin 8b rotates while being in contact with the end 5a of the position regulating pin insertion opening 5. This is because the leaf spring material 15 is configured to rotate around the motor shaft 7, so that once the position regulating pin 8b hits the core bar 3 as shown in FIG. 5, it will not come off automatically. Problems have been caused by phase shifts and tracking errors during reading.

Furthermore, even if the leaf spring material 18 shown in FIG. 6 is configured to rotate around the fulcrum (c) instead of the leaf spring material 15 shown in FIG. )
Since the structure is such that the leaf spring material 18 is located outside the yoke 16, the leaf spring material 18 protruding from the yoke 16 hits the housing, making assembly difficult.

Purpose of the Invention In order to eliminate the above-mentioned problems, the present invention aims to ensure that the position regulating pin (drive roller) can be smoothly inserted into the position regulating (drive roller) insertion hole no matter where in the core metal, and that the position regulating pin (drive roller) can be inserted outside the yoke. It is an object of the present invention to provide a rotary drive device having a shape smaller than its diameter.

Structure of the Invention In order to achieve the above object, the present invention is such that the drive roller spring is configured such that the fulcrum of the drive roller is near the outer circumference of the yoke, and the drive roller is configured to have a fulcrum point near the outer circumference of the yoke. It has the advantage that it can be smoothly inserted into the drive roller insertion hole, and that it can be made smaller in shape than the outer diameter of the yoke so that it can be easily attached to the housing.

DESCRIPTION OF EMBODIMENTS The configuration of an embodiment of the present invention will be described below with reference to the drawings. FIG. 7 is a perspective view of a rotary drive device according to an embodiment of the present invention, FIG. 8 is an exploded perspective view of the same embodiment, FIG. 9 is a diagram showing the operation of the same embodiment, and FIG. 10 is a diagram showing the operation of the same embodiment. It is a DD' cross-sectional view of.

In FIGS. 7 to 10, reference numeral 21 denotes a board for attaching to the housing, and this board 21 has protrusions 21a to 21c for attaching to the housing, and a circular protrusion 21d in the center. A rotating shaft 22 is rotatably held in the center of the substrate 21 by a ball bearing or the like, and the rotating shaft 22 is integrally formed with an inner shaft 22a, a middle shaft 22b, and an outer shaft 22c. 23, the center hole 23a is the center shaft 22
This yoke 23 rotates with the rotation of the rotating shaft, and has a hole 23b through which the drive roller 24a passes and a hole 23c to which the drive roller spring 24 is attached. York 23
An edge portion for contacting the core metal 3 is formed on the outer periphery of the metal core 3 .

The drive roller spring 24 has a mounting portion 24b including a hole 24c that fits into the center shaft 22b, and a bent arm 24d formed from the mounting portion 24b, and a drive roller 24a at the tip of the bent arm 24d.
is rotatably attached. This mounting part 2
A hole 24e, which is attached to the hole 23c of the yoke 23 with a mounting pin 25, is formed at the midpoint between the bent arm 4b and the bent arm 24d. 26 is a magnet that attracts the core metal 3, and this magnet 26 is attached to the yoke 23.
The thickness is such that the height is the same as the edge 23d. This magnet 26 is connected to the drive roller 2
A notch 26a that avoids the mounting pin 25, a notch 26b that avoids the mounting pin 25, and a hole 26c that fits into the center shaft 22b are formed.

When the drive roller 24a attached to the drive roller spring 24 is pushed by the core metal 3, it tilts around the mounting pin 25 as shown in FIG. 10.

Next, the operation of the above embodiment will be explained. 7 to 10, when the floppy disk cassette of FIG. 1 is placed in the rotary drive device of the embodiment, the drive roller 24 happens to be as shown in FIG.
Even if the drive roller 24a contacts a part of the core metal 3, the drive roller 24a moves smoothly over the core metal 3 without getting stuck because it is tilted downward with respect to the traveling direction with the mounting pin 25 as a fulcrum. It moves in the E direction in the figure, and is finally inserted into the drive roller (position regulating pin) insertion hole 5 to rotate the floppy disk 2 at the normal position.

Note that if the yoke 23 is made of plastic, it will be better against friction with the core metal 3.

Effects of the Invention As is clear from the above embodiments, the present invention has a drive roller spring configured such that the fulcrum of the drive roller is near the outer periphery of the yoke, so that the drive roller can smoothly hit any part of the core metal. Since it is inserted into the drive roller insertion hole and has a smaller shape than the outer diameter of the yoke, it has the effect of being easy to attach to the housing.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a general floppy disk cassette, and FIGS. 2 a to 2 c are diagrams showing the state of engagement between a general floppy disk and a general rotational drive device.
Figure 3 is an exploded perspective view of a conventional rotary drive device;
The figure is a top view showing the problems of conventional rotary drive devices.
5 is a sectional view taken along line A-A' in FIG. 4, FIG. 6 is a perspective view of a second conventional example of a leaf spring member, and FIG. 7 is a perspective view of a rotary drive device according to an embodiment of the present invention. 8th
The figure is an exploded perspective view of the same embodiment, FIG. 9 is a diagram showing the operation of the same embodiment, and FIG. 10 is a sectional view taken along line DD' in FIG. 9. 1...cassette, 2...floppy disk,
3... Core metal, 4... Motor shaft insertion hole, 5... Drive roller insertion hole, 21... Board, 22... Rotating shaft,
23... Yoke, 24... Drive roller spring, 24
a... Drive roller, 25... Mounting pin, 26...
magnet.

Claims (1)

[Claims] 1 A rotary drive device main body that drives a floppy disk having a cored metal, a disk-shaped yoke rotatably attached to the rotating shaft of a motor attached to this main body and having a hole, and a rotary drive device located at the bottom of this yoke. a drive roller spring having one end attached to the rotating shaft, and integral with a mounting portion formed in a radial direction from the center of the rotating shaft and a bent arm formed in a circumferential direction of the yoke; and a mounting pin for fixing the connecting portion of the curved arm to the yoke, and a drive roller that is rotatably attached to the tip of the curved arm and passes through a hole in the yoke and engages with a pin insertion hole in the core metal. A rotary drive device, characterized in that the drive roller is tilted downward with respect to the traveling direction to prevent the drive roller from getting stuck in the pin insertion hole.