JPH01128260A - Disk chucking mechanism - Google Patents

Abstract

PURPOSE:To securely prevent a mischucking by fitting a driving pin to a pin supporting member with rigidity as to be hardly deformed, even at the time of a chucking operation, at a prescribed angle and allowing it to be oscillatable in the reverse direction to its fitting-in direction. CONSTITUTION:When a center hub is mounted on a flange 13 under chucking operation, and even when the hub is eccentrically mounted or the driving pin 15 is temporarily pressed to the side of a spindle 5 due to size variations, a chucking plate 14 as a spindle supporting member is not deformed, because of enough rigidity of the chucking plate 14, and moved parallel in the direction of an arrow A' against an energizing force of a spring 18, keeping under pressing contact with the flange 13. For this, the driving pin 15 fitted vertically to the chucking plate 14 is moved parallel in the direction of A' without inclining, and hence no floating happens to a disk, and then no mischucking takes place. In other words, the chucking plate 14 can stably be energized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Fields] The present invention relates to a method for positioning a disk loaded in a recording/reproducing device for recording or reproducing information on a disk as a rotating recording medium in a predetermined position with respect to a disk drive mechanism. and put it on,
This relates to a disc chucking mechanism that holds the disc.

[Prior Art] Many types of disc chucking mechanisms have been proposed in the past, depending on the type of disc.

FIG. 9 shows the structure of a so-called mini-floppy disk, which has become mainstream as magnetic disks of magnetic recording media have recently become popular as demands for higher recording density, smaller size, and higher reliability have increased. This mini-floppy disk has a flexible magnetic disk 1 rotatably housed in a synthetic resin cassette 2. A recess 2a is formed on one side of the cassette 2 so as to face both sides (
Rectangular head windows 2b for inserting a magnetic head (not shown) into the recess 2a and slidingly contacting the magnetic disk 1 are formed facing each other on both sides (the back side is not shown).

Further, in the recess 2a, an opening 3a having approximately the same size as the head window 2b is provided at opposing positions on both sides, and shutters 3 are provided so as to be able to slide freely in the left and right directions in the figure while sandwiching the cassette 2 from both sides. is being used.

When the shutter 3 moves to the right end of its sliding range in the figure, the opening 3a is in a position facing the head window 2b and the magnetic disk 1 is exposed, and the shutter 3 moves to the left end of its sliding range in the figure. When the head window 2b is moved to , the head window 2b is closed. The shutter 3 is always biased toward the left in the figure to close the head window 2b by a spring (not shown), and when the floppy disk is not in use, the shutter 3 closes the head window 2b to protect the magnetic disk 1 from intrusion of dust and external forces. It is being considered that it will be possible.

On the other hand, an opening 2C is formed in the center of the cassette 2, and a center hub 4 made of magnetic metal is attached to the rotation center of the magnetic disk 1 through this opening 2C.
is exposed. A rectangular hole 4a into which a spindle 5, which will be described later, fits, and a rectangular hole 4b, into which a drive pin 10, which will be described later, fits, are formed in the center of the center hub 4, respectively.

Next, FIGS. 10 and 11 are a vertical sectional view and a bottom view showing the structure of a conventional disk jacking mechanism provided in a floppy disk drive device of a magnetic recording and reproducing apparatus using a mini-floppy disk as described above. It is.

In both figures, reference numeral 5 denotes a spindle which is the output rotation shaft of a disk rotation motor (not shown), and is fitted into the hole 4a at the center of the center hub 4 as described above during chucking.

A disc-shaped flange 6, which is a holding member for holding the magnetic disk 1 thereon, is integrally fixed to the upper end of the spindle 5. A magnet 7 is provided on the upper surface side of the flange 6 in order to attract and hold the center hub 4 made of a magnetic material by magnetic force. Instead of providing the magnet 7, the flange 6 itself may be magnetized.

3 ~ Furthermore, a hole 6a is formed in the flange 6 so as to pass through it in the vertical direction through which a drive pin 10 (described later) is inserted and moved up and down.

Further, on the lower surface of the flange 6, a support arm 8 having a rigidity that hardly deforms due to the external force applied during the chucking operation is mounted on the shaft 9 as a fulcrum in the direction toward the outer periphery of the flange 6 as shown by arrow a, that is, the direction of the magnetic disk 1. It is attached to be rotatable in the direction toward the outer periphery and in the opposite direction, and movable in the direction toward or away from the flange 6.

'A drive pin 10 for transmitting rotational driving force to the magnetic disk 1 is attached to the upper surface of the free end of the support arm 8. The drive pin 10 is loosely fitted into the aforementioned hole 6a of the flange 6. Also, the drive pin 10
is provided as a roller so as to be rotatable with respect to the support arm 8.

- The force supporting arm 8 is moved in the direction of arrow F2 in FIG. That is, the drive pin 10 is constantly biased in the direction toward the outer circumference of the magnetic disk 1, and the drive pin 10 is fitted into the hole 4b of the center hub 4 in the direction of arrow F2 in FIG. It is constantly biased in the direction.

With such a structure, the chucking operation is performed as follows.

First, the magnetic disk 1 is loaded onto the flange 6 by a loading mechanism (not shown), and the center hub 4 of the magnetic disk 1 is placed on the upper surface of the flange 6. The spindle 5 fits into the hole 4a at the center of the center hub 4. At this time, if the positions of the drive pin 10 and the hole 4b of the center hub 4 do not match, the center hub 4 attracted by the magnetic force of the magnet 7 presses the drive pin 10, and the support arm 8 uses the shaft 9 as a fulcrum. It moves downward in FIG. 10 against the urging force of the spring 11, and the drive pin 10 is pushed under the disk mounting surface. Then, by the drive of a disk rotation motor (not shown), the Franciro rotates and the drive bin 1 is rotated.
0 and the hole 4b are aligned, the support arm 8 moves in the direction of arrow F2 in FIG. Fit into the hole 4b as shown in Figure 12. Note that when the center hub 4 is placed on the flange 6, if the hole 4b and the driving pin 10 are aligned, the driving pin 10 will of course fit into the hole 4b as is.

The center hub 4 is attached to the magnet 7 on the top surface of the flange 6.
magnetic disk 1 or flange 6 by being attracted to
held on top.

Then, as the spring 11 is biased in the direction F1 in FIG.
1b and 42b, and due to their oppression, the center hub 4 moves to the right in FIG. 12, and the spindle 5 moves to the two sides 41a of the hole 4a.

42a, the spindle 5 presses and engages with the magnetic disk 1.
The magnetic disk 1 is positioned and held at the center of rotation.

In this way, chucking is completed, and recording and reproduction are possible thereafter.

On the other hand, FIGS. 13 and 14 are a longitudinal sectional view and a bottom view showing other structural examples of the conventional disk chucking mechanism,
In both figures, the same reference numerals are given to the same members as in FIGS. 10 to 12 of the conventional example described above.

In this example, the plate spring 11 of the above-mentioned conventional example is provided, and instead, a driving pin 10 is installed at the tip corresponding to the above-mentioned support arm 8.
The support arm 12 to which is attached is configured as a leaf spring, and its base end is fixed to the lower surface of the flange 6 by a shaft 12a. The drive bin 10 is movably supported in the downward direction in FIG. 13 by the elasticity of the support arm 12, and
It is pushed upward in the figure when it is inserted into.

At the time of chucking, the drive pin 10 is fitted into the hole 4b of the center hub 4 as shown in FIG. 13 by the urging force of the support arm 12 as a leaf spring. and drive bin 1
When the center hub 4 presses the drive bin 10 toward the spindle 5 in response to a rotation of Due to the repulsive force of the arm 12, the drive bin 10 suppresses and urges the center hub 4 toward the outer circumference of the disk as indicated by arrow F3, thereby performing chucking.

[Problems to be Solved by the Invention] However, the conventional disk chucking mechanism as described above has the following problems.

First, in the conventional examples shown in FIGS. 10 to 12, the drive bin 10
As the support arm 8 rotates, the support arm 8 curves into an arc shape as shown by arrow a in FIG. For this reason, hole 4 of center hub 4
If the distance between the drive bin 10 and the spindle 5 differs due to variations in the distance between a and 4b, the hole 4 of the drive bin 1o
Since the engagement position with respect to b is shifted along the circumferential direction of the flange 6, the holding position of the center hub 4 on the flange 6,
The angle causes confusion. That is, the holding position and angle on the flange 6 vary due to the disc.

When this variation occurs, in other disk chucking mechanisms that do not have the above-mentioned variation in holding position for the same disk, the reading start position of each track during reading will shift due to the above-mentioned positional deviation angle deviation.
This makes it impossible to obtain compatibility with other jacking mechanisms.

Also, according to the conventional structure shown in FIGS. 10 to 12, the spring 11
Since the support arm 8 is biased in two directions, the F1 direction in FIG. 11 and the F2 direction in FIG. 10, the shape becomes complicated and it becomes difficult to set the spring force in both directions. Therefore,
Stable biasing in both directions may not be possible, and as a result, stable chucking may not be possible.

On the other hand, in the conventional examples shown in FIGS. 13 and 14, the drive bin 1
0 is pressed against the center hub 4, the drive bin 10 tilts due to the twisting of the support arm 12 as a leaf spring.
At the time of chucking, the drive bin 10 moves under the center hub 4 due to its inclination, so that the center hub 4
This causes the problem that the chucking operation becomes uncertain. In addition, the leaf spring of the support arm 12 must have a large spring constant and be strong.
It is difficult to adjust the spring force, which also makes the chucking operation uncertain.

[Means for Solving the Problems] In order to solve these problems, according to the present invention, a rotation drive mechanism is provided for a disk loaded in a recording/playback device that records on or plays back from a disk as a rotating recording medium. In a disk chucking mechanism that chucks a disk by inserting and engaging a drive pin for force transmission, the drive pin is attached at a predetermined angle to a drive bin support member that has a rigidity that hardly deforms during chucking operation. The support member is movable linearly along the radial direction of the loaded disk, biases the drive pin in the direction toward the outer circumference of the disk, and moves the drive pin in the direction in which it fits into the disk and vice versa. A structure that can swing in the direction and is biased in the insertion direction is adopted.

[Function] According to this structure, the drive pin is attached at a predetermined angle to the drive bottle support member having the above-mentioned rigidity. The drive pin is not pressed and tilted during the chucking operation. Therefore, it is possible to prevent the disk from floating during chucking. In addition, during chucking, the drive pin is linearly displaced along the radial direction of the disk according to the support member, so the chucking position is shifted by the disk, unlike when the drive pin is driven along an arcuate movement path in the conventional example. There will be no variation.

[Embodiments] Details of embodiments of the present invention will be described below with reference to FIGS. 1 to 8.

FIRST EMBODIMENT FIGS. 1 to 4 illustrate the structure of a disk chucking mechanism provided in a floppy disk drive device using the mini-floppy disk of FIG. 9 described above as a first embodiment of the present invention. . FIG. 1 and FIG. 2 are longitudinal cross-sectional views showing a state in which the drive pin for transmitting rotational driving force is projected onto the disk mounting surface and a state in which it is pushed down from the disk mounting surface, respectively. FIG. 3 is a bottom view of the jacking mechanism, and FIG. 4 is an explanatory diagram of the magnetized state of the upper surface of the flange.

In FIGS. 1 and 2, reference numeral M designates a disk rotation motor, and a disk-shaped flange 13, which is a disk holding member, is attached to the tip of a spindle 5, which is an output rotation shaft, so as to rotate together with the spindle 5. is fixed to.

The flange 13 has a hole 13 through which a drive pin 15 for transmitting rotational driving force is inserted, similar to the conventional flange described above.
In addition to the drive pin 1 that is formed to pass through the top and bottom,
A hole 13b for attaching a chuck plate 14, which is a support member corresponding to the support arm 8 of the conventional example that supports the support arm 5, is formed vertically through the hole 13b. The hole 13b is arranged to face the hole 13a in the diametrical direction of the flange 13 with the spindle 5 in between. As shown in FIGS. 3 and 4, the holes 13b are arranged from the outer circumferential side to the inner circumferential side of the flange 13, including a large hole portion 131b with a large diameter and a small hole portion 1 with a small diameter.
32b are formed in a continuous manner. Large hole 1
The diameter of the small hole 132b is large enough to allow insertion of the collar 16a of the dowel 16 for attaching the chuck plate 14, which will be described later. 16a is formed to a size that cannot be inserted.

In addition, the flange 13 is designed so that it can attract and hold the center hub 4 of the disk by magnetic force, as in the case of the conventional example.
For example, the upper surface side is magnetized as shown in FIG. 4 showing the polarity of N and S poles. A magnet may be attached as a separate member without magnetizing the flange 13 itself.

Next, in FIGS. 1 to 3, reference numeral 14 is a chuck plate which is a support plate for supporting the drive pin 15 as described above, and has an opening 14a in the center for allowing the spindle 5 to escape, and has an approximately donut shape. formed into a shape.

The chuck plate 14 does not bend even if an external force is applied to the chuck plate 14, such as when the drive bin 15 is pressed against the center hub 4 of the disk during a chucking operation to be described later.
It shall be constructed to have sufficient rigidity to prevent deformation.

A drive bottle 15 is installed perpendicularly to the upper surface of one end of the chuck plate 14, and is loosely fitted into the hole 13a of the flange 13.

Further, a dowel 16 for attaching the chuck plate 14 to the flange 13 through the hole 13b of the flange 13 is fixed to the upper surface of the end of the chuck plate 14 opposite to the drive bottle 15. A collar portion 16a is formed at the upper end of the dowel 16.

When attaching the chuck plate 14 to the flange 13, first insert the dowel 16 of the chuck plate 14 into the large hole 131b of the hole 13b, and then move it toward the small hole 132b, so that the flange 16a or the small The chuck plate 14 is secured to the upper surface of the flange 13 at the periphery of the hole 132b, and is attached to the flange 13 via the dowel 16.

On the other hand, as shown in FIG.
Arms 14b, 14b are formed on both sides of the intermediate region between a and 13b for hanging a spring. Although not shown, the chuck plate 1
4 is provided with an arm at a position diagonally opposite each of the arms 14b and 14b, and this attachment is configured as a coil spring between each of the arms and the arm 14a and 14b. The spring 18.18 is stretched. The spring 18.18 uses its elasticity to pull the chuck plate 14 diagonally upward in the longitudinal direction in FIGS.
3, it is biased upward in the figure.

When the chuck plate 14 is urged in the direction A, the redowel 1
6 is always held in the small hole part 132b of the hole 13b, and the hole 1
It is held without coming out of 3b. That is, the chuck plate 14 is held without coming off the flange 13.

Note that the position of the collar portion 16a of the dowel 16 is such that the dowel 16 is located at the small hole portion 132 of the hole 13b of the flange 13, as described above.
The disk is set so that a gap is left between the upper end of the flange portion 16a and the disk mounting surface of the flange 13 when the disk is held in the disk portion b.

Due to the structure of this type of installation, the chuck plate 14 is attached to the dowel 1.
6 as a fulcrum, it is attached so as to be able to swing toward and away from the lower surface of the flange 13, and as the drive bin 15 swings toward and away from the lower surface of the flange 13 through the hole 13a, It is designed to move up and down in the directions of arrows B and B' in FIGS. 1 and 2. and spring 18.18
The chuck plate 14 is urged upward in FIGS. 1 and 2 by the vertical force of , which causes the drive bin 15 to fit into the hole 4b of the center hub 4 of the disk during chucking, which will be described later, in the direction of arrow B. is always energized.

Further, in the above structure, the holes 13a, 13 of the flange 13
b are opposed to each other in the diametrical direction of the flange 13 with the spindle 5 in between, and the longitudinal direction of both is along the diametrical direction, so that the chuck plate 14 can be moved along the diametrical direction as shown in FIG. 3, and is movable linearly in directions A and A' in FIG. That is, the drive bottle 15 is provided to be linearly movable in the force directions A and A' according to the chuck plate 14, and is biased in the direction A toward the outer circumference of the disk held on the flange 13.

Next, the chucking operation of the disk chucking mechanism on the wood flow side having the above configuration will be explained.

First of all, when the disc is not installed, the splash is 18.18
The chuck plate 14 is pressed against the lower surface of the flange 13 by the urging force of
It projects onto the disk mounting surface of the upper surface of the flange 13 through the flange 13. Further, the drive pin 15 is biased in the direction of arrow A toward the outer circumference of the disk within the hole 13a by the tension of the spring 18.18.

Next, the floppy disk shown in FIG. 9 is placed on the disk mounting surface on the upper surface of the flange 13 by a loading mechanism (not shown), but before that, the disk rotation motor M is rotationally driven to rotate the flange 13 together with the spindle 5. Start.

When the center hub 4 of the disk is placed on the flange 13, the spindle 5 is inserted into the center hole 4 of the center hub 4.
The center hub 4 made of a ferromagnetic material is attracted to the magnetized flange 13 and mounted on the flange 13.

On the other hand, since the drive pin 15 protrudes above the flange 13, if it is located exactly opposite the hole 4b when the center hub 4 is installed, it will be inserted into the hole 4b as it is.
If the position is not correct, the drive bin 15 is pressed downward by the lower surface of the center hub 4, and the flange 13
is pushed into the hole 13a. Due to the pressure, the chuck plate 14 swings to a position away from the flange 13 shown in FIG. 2, using the dowel 16 as a fulcrum against the biasing force of the spring 18.18.

Then, the flange 13 is rotated while idling relative to the center hub 4, and the drive pin 15 is rotated through the hole 4b of the center hub 4.
When it comes to the position facing the spring 1B, the pick plate 14
, 18 swings upward, and the drive bottle 15 protrudes and fits into the hole 4b.

As the flange 13 further rotates, the driving pin 15 abuts and engages with the inner edge of the hole 4b and presses it, as in the case of the conventional example shown in FIG. The center hub 4 moves and the inner edge of the hole 4a abuts and engages the spindle 5, centering the disk and holding it in place.

In this way, the chucking operation of the disk to the flange 13 is completed, and the disk can thereafter rotate integrally with the flange 13.

According to this embodiment as described above, when the center hub 4 is mounted on the flange 13 in the above-described chucking operation, the drive bin may be damaged due to eccentric mounting of the center hub 4 or variations in the dimensions of the center hub. Even if the chuck plate 15 is temporarily pressed toward the spindle 5 side, the chuck plate 1
4 has rigidity and does not deform as described above, and moves in parallel from FIG. 1 to the direction of arrow A' in FIG. 3 against the biasing force of springs 18 and 18 while being pressed against flange 13.

Therefore, the drive bin 15, which is attached perpendicularly to the chuck plate 14, moves in parallel in the A' direction without being tilted. Therefore, as in the case of the prior art example in which the support arm of the drive bin 15 is made of a leaf spring, the drive bin 15 does not tilt during chucking, and this inclination causes the disk to float, thereby preventing mischucking.

Further, according to this embodiment, the spring 1 that biases the chuck plate 14 is
8.18 urges the chuck plate 14 in both directions A and B in FIGS. 1 to 3, but unlike the conventional example shown in FIGS. 10 to 12, both the six directions and the B direction are straight lines. direction, and can be configured as a normal coil spring. Moreover, the spring constant can be set smaller than in the case of FIGS. 10 to 12, and the spring force can be easily adjusted, making it possible to maintain the spring force at a predetermined level. Therefore, the chuck plate 14 can be stably urged, and chucking can be performed stably.

Further, according to this embodiment, the chuck plate 14 is
In the figure, A and A' along the radial direction of the flange 13, that is, the radial direction of the mounted disk, are movable linearly in the force direction.
Move linearly in the A' direction. Therefore, even if there are variations in the distance between the holes 4a and 4b of the center hub 4 of the disk, the hole 4b of the drive bin 15 is
The position of engagement with the flange 13 does not shift in the circumferential direction of the flange 13.

That is, due to the variation in the dimensions of the center hub 4, chucking can be performed accurately at a predetermined position without causing variations in the chucking position, and compatibility with other disc chucking mechanisms can be achieved.

Second Embodiment By the way, in the first embodiment described above, the spring 18 configured as a normal coil spring was used to bias the chuck plate 14. A torsion coil spring can also be used as shown in FIGS.

That is, in the second embodiment of the present invention, the chuck plate 14 is bent in a substantially dogleg shape as a whole, as shown in FIGS. - using a wound torsion coil spring 19;

The torsion coil spring 19 is elastically loaded between the base end of the boss 16 of the chuck plate 14 and the flange 13, as shown in FIGS. 5 to 7. In order to load the torsion coil spring 19, a hole 13b is formed on the lower surface of the flange 13 shown in FIG.
Two bins 17a and 17b are provided near the. Further, a shallow recess 13c is formed in a region where the torsion coil spring 19 is stretched.

The wound center portion of the torsion coil spring 19 is fitted into the base end of the boss 16, and the entire body is housed in the recess 13c, with both ends attached to the pin 17a.

17b, respectively.

The torsion coil spring 19 is bent and attached, and its elastic force that tries to return to its original shape presses the proximal end of the boss 16 and the chuck plate 14 in the direction F in FIG. 5. Then, the chuck plate 1 is
4 is urged in the A direction, and also clockwise in the figure with the boss 16 as a fulcrum, and the drive bin 15 is urged in the B direction.

With this structure as well, the chuck plate 14 can be biased in the same manner as in the first embodiment, and the same effects as in the first embodiment can be obtained.

[Effects of the Invention] As is clear from the above description, according to the present invention, a drive bin for transmitting rotational driving force is provided to a disk loaded in a recording/playback device that performs recording or playback on a disk as a rotating recording medium. In the disk chucking mechanism for chucking a disk by inserting and engaging the drive pin, the drive pin is attached at a predetermined angle to a drive pin support member having a rigidity that hardly deforms even during a chucking operation,
The support member is movable linearly along the radial direction of the loaded disk, and is biased in the direction toward the outer circumference of the disk, and in the direction in which the drive bin is fitted into the disk and in the opposite direction. Since the structure is swingable and biased in the insertion direction, mischucking due to tilting of the drive bin can be reliably prevented. In addition, the drive bottle support member can be stably biased, and chucking can be performed stably. Further, even if there are variations in the dimensions of the disk components, there will be no variation in the chucking position, and excellent effects such as accurate chucking and compatibility with other disk chucking mechanisms can be obtained.

[Brief explanation of the drawing]

1 and 2 show the structure of a disk chucking mechanism according to a first embodiment of the present invention, respectively, showing a state in which the drive bin of the mechanism protrudes onto the disk mounting surface and a state in which it is pushed down from the disk mounting surface. 3 is a bottom view of the same mechanism, FIG. 4 is an explanatory diagram of the magnetized state of the upper surface of the flange of the same mechanism, and FIGS. 5 and 6 are respectively the second embodiment of the present invention. Vertical sectional views of the drive bin of the disc chucking mechanism according to the embodiment in its protruding and depressed states, FIG. 7 is a bottom view of the same mechanism, and FIGS. 8(A) and (B) are chucks of the same mechanism, respectively. 9 is a bottom view of a mini-floppy disk, FIG. 10 is a vertical cross-sectional view of a conventional disk chucking mechanism, and FIG. 11 is a bottom view of the same mechanism. Figure 12 is a top view of the center hub being chucked into the same mechanism, Figure 13
The figure is a longitudinal sectional view of another conventional chucking mechanism, and FIG. 14 is a bottom view of the same mechanism. 1... Magnetic disk 2... Cassette 4... Center hub 5... Spindle 13... Flange 14... Chuck plate 15... Drive bin
16...Dowel 18...Spring 19...Torsional coil spring・1, General

Claims (1)

[Claims] In a disk chucking mechanism that chucks a disk by inserting and engaging a drive pin for transmitting rotational driving force into a disk loaded in a recording/reproducing device that performs recording or playback on a disk as a rotating recording medium, the drive The pin is attached at a predetermined angle to a drive pin support member that has rigidity that hardly deforms even during a chucking operation, and the support member is movable linearly along the radial direction of the loaded disk, so that the drive pin is fixed to the outer circumference of the disk. What is claimed is: 1. A disk chucking mechanism characterized in that the drive pin is urged in a direction toward the disk, is swingable in a direction in which the drive pin fits into the disk and in the opposite direction, and is urged in the insertion direction.