JPH0434222B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a disk member chucking mechanism, and more specifically, the present invention relates to a disk member chucking mechanism, and more particularly, a spindle of a motor that drives a disk member, and a pin member rotationally driven by the spindle are connected to a disk member to which the disk member is attached. The present invention relates to a disk member chucking mechanism that chucks a disk member by engaging with the disk member.

[Prior art]

As a disk member chucking mechanism of this type, a chucking mechanism provided in a mini-floppy disk drive device for recording and reproducing information on a so-called mini-floppy disk is known.

The conventional structure and chucking operation of this mechanism will be explained with reference to FIGS. 1 to 7.

1 and 2, the reference numeral 1 is a spindle of a motor (not shown) that drives a mini-floppy disk (hereinafter referred to as disk), and a spindle flange 2 is fitted to the upper end of this spindle 1. If so, it is fixed.

The spindle flange 2 is formed into a disk shape with a recess between the center and outer circumference of the upper surface, and the center is fixed to the spindle 1. A combined circular slide sheet 3 is slidably disposed, and an attraction magnet 4 formed in the shape of a substantially donut-shaped plate with a portion cut away is fixed in the recess.

Further, a hole 2a is formed vertically through the part of the spindle flange 2 corresponding to the separated part of the adsorption magnet 4, and a drive pin shaft 5 is arranged to be able to rise and fall through this hole 2a.
A drive pin 6 corresponding to the above-mentioned pin member is rotatably supported at the upper end of the drive pin shaft 5.

The drive pin shaft 5 is cantilevered by an elastic member 7 shown in FIGS. 3 and 4. The elastic member 7 is formed as a substantially rectangular frame-shaped flat plate having four sides 7a to 7d, and the drive pin shaft 5 is fixed upright on the center of one side 7a. Also, holes 7e, 7e are formed at both ends of the side 7c opposite to the previous side 7a, and the elastic member 7 is connected to the spindle flange 2 with a dowel 8 through these holes 7e, 7e, as shown in FIG. is fixed to the bottom surface of the

In this case, the free end side of the elastic member 7 on which the drive pin 6 is provided is pressed against the periphery of the hole 2a on the lower surface of the spindle flange 2 by the urging force of the elastic member 7 itself.

On the other hand, in FIG. 1, the reference numeral 9 denotes a magnetic sheet which is the magnetic recording medium of the disk, and is housed in a case (not shown). Retained.

As shown in FIGS. 5 and 6, the hub 10 is formed with first and second hub holes 11 and 12, which are openings for chucking. That is, the first hub hole 11 is formed in a substantially square shape substantially at the center of the hub 10, and its periphery is formed in an upright manner. Further, the second hub hole 12 is formed near the outer circumference of the hub 10 and has a substantially rectangular shape.

The operation of the chucking mechanism having the above configuration is performed as follows.

First, the drive motor is started, and the spindle 1 and spindle flange 2 are rotationally driven, and the disk is placed from above on the sliding seat 3, which is the seating surface. In this case the disk is hub 10
The hub 10 is placed so as to fit into the spindle 1 with the hub hole 11 located approximately at the center thereof, and the hub 10 is attracted by the attraction magnet 4 and attracted onto the surface of the slide sheet 3, and is fixedly supported in the thrust direction.

Note that the drive pin 6 is biased upward by the elastic member 7 before the disk is attached, and the drive pin 6 is biased upwardly by the elastic member 7.
As shown in the figure, its upper end protrudes above the upper surface of the spindle flange 2, but when the hub 10 is attracted, it is pressed downward by the hub 10, and the elastic member 7 is bent downward, causing the upper end to protrude above the upper surface of the spindle flange 2. It descends until the end surface becomes flush with the top surface of the slide sheet 3.

Next, as shown in FIG. 5, when the drive pin 6, which is rotationally driven in the direction of the arrow Z, advances to the position a shown by the dotted line and advances to the inner region of the second hub hole 12 of the hub 10, the elastic member 7 The drive pin 6 rises due to the biasing force and fits into the second hub hole 12. As the drive pin 6 continues to rotate, the drive pin 6 moves to a position a' indicated by a solid line, and hits points C and D on the peripheral end face of the hub hole 12 and engages with the hub hole 12. Furthermore, while moving from position a to position a' in this manner, drive pin 6 presses the periphery of hub hole 12 outward as shown by arrow F, and this pressing force causes hub 10 to be displaced in direction F.
The hub hole 11 abuts and engages the spindle 1 at points A and B on the peripheral end surface. A cross-sectional view of this state is shown in FIG.

As described above, the hub 10 is positioned and held by the spindle 1 and the drive pin 6 engaging with points A to D of the hub holes 11 and 12. In other words, they are being chased.

However, in the conventional configuration as described above, since the drive pin 6 is provided upright on the elastic member 7, the drive pin 6 is provided upright on the elastic member 7, so it is difficult to mount the disk again after ejecting the disk with the drive motor stopped. There were cases in which mischaking as shown in FIGS. 7a to 7c occurred.

That is, in the above case, when the disk is mounted, the outer periphery of the hub hole 12 of the hub 10 may catch on the outer periphery x of the drive pin 6 as shown by the dotted line, as shown in FIG. 7a. In this case, the drive pin 6 that is hooked and pushed down is inclined toward the outside in the radial direction of the disk with respect to the direction perpendicular to the mounting surface of the hub 10 in accordance with the inclination of the elastic member 7 that bends downward. As a result, the upper end surface of the drive pin 6 is inclined with respect to the mounting surface of the disk at an angle of θ ₁ in FIG. 7b, as shown in FIGS. In order to be lifted up, the drive pin 6 engages with the hub hole 12 at the above-mentioned outer periphery x and point C', which are different from the normal ones.

Further, as a result of positioning by this engagement, the spindle 1 also engages with the hub hole 11 at points A' and B', which are different from the normal positions. In other words, chucking is performed at a position different from the normal position.

In this state, the elastic member 7 is bent to a large extent.
The hub 10 is pushed up from the DU surface, that is, the disk mounting surface, as shown in FIG. 7b, by the drive pin urged by the strong elastic force. As a result, large surface wobbling occurs in the magnetic sheet 9 during recording and reproduction, and contact between the magnetic sheet 9 and a magnetic head (not shown) becomes unstable, making normal recording and reproduction impossible.

Furthermore, as a result of the deviation in the rotational direction of the magnetic sheet 9, one pulse is generated for one rotation of the magnetic sheet 9.
The output of the INDEX signal also becomes unstable.

Furthermore, the free end side of the elastic member 7 is not pressed against the lower surface of the spindle flange 2, resulting in instability, which causes vibrations during recording and reproduction, and shortens the life of the elastic member 7.

The above drawbacks are not limited to the above-mentioned chucking mechanism, but are common to all disk member chucking mechanisms of the first type.

〔the purpose〕

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a highly reliable disk member chucking mechanism that can always accurately chuck a disk member.

〔Example〕

Hereinafter, an embodiment in which the present invention is applied to the chuck mechanism of the aforementioned mini floppy disk drive device will be described with reference to FIG. 8 and the following drawings. In each figure, the same or corresponding parts as in FIGS. 1 to 7 are denoted by the same reference numerals, and explanations of the same parts will be omitted.

8 and 9 are a top view and a side view of the chucking mechanism according to this embodiment.

As shown in both figures, in this embodiment, the drive pin 6
is supported at an angle. That is, the drive pin 6 is oriented in the direction of rotation of the spindle flange 2 (direction of rotation of the disk) with respect to the direction perpendicular to the upper surface of the spindle flange 2 (the mounting surface of the hub 10 of the disk). It is supported in an inclined state at an angle indicated by θ ₂ .

The elastic member 7 that supports the drive pin in this inclined manner is formed in the structure shown in FIGS. 10 to 12. Here, Fig. 10 is a top view, Fig. 11 is a side view seen from the X direction of Fig. 10, and Fig.
FIG. 2 is a side view seen from the Y direction.

As shown in these figures, the entire elastic member 7 is formed as a substantially rectangular frame-shaped plate having four sides 7a to 7d, similar to the conventional example described above, but unlike the conventional example, the elastic member 7 has a side 7a that supports the drive pin 6. The two sides 7b and 7d that are continuous at both ends are approximately in the center and are approximately "ku".
These sides 7b and 7d
A difference in height is formed between both ends of the hole, as indicated by the symbol H in FIG. As shown in FIG. 12, the side 7a is bent in a substantially dogleg shape at two places in the middle, and the support surface that supports the drive pin 6 in the center extends in a direction perpendicular to the plane of the side 7c. On the other hand, the side 7a is inclined toward the longitudinal direction corresponding to the rotational direction of the disk. A drive pin shaft 5 that supports the drive pin 6 is fixed upright to the inclined central support surface.

The elastic member 7 having such a structure has holes 7 formed at both ends of the side 7c as in the conventional example described above.
e and 7e, the dowels are pressed against and fixed to the lower surface of the spindle flange 2. In this case, the elastic member 7
The free end side of is a spindle flange 2 into which the drive pin 6 is fitted due to the elastic force of the elastic member 7 itself.
It is pressed against the periphery of the hole 2a on the lower surface of. Further, the drive pin 6 supported by the elastic member 7 in a cantilever manner is supported on the spindle flange 2 with an inclination as described above due to the inclination of the central portion of the side 7a.

The structure of the other parts of the support structure for the drive pin 6 of this embodiment is the same as that of the prior art example described above.

Next, the chuck operation of this embodiment having the above configuration will be explained. In this case, the chucking operation will be explained particularly when the disk is ejected from a state where the drive motor is stopped and then the disk is mounted again.

In this case, as shown in FIG. 13a, it is assumed that the outer periphery of the hub hole 12 of the hub 10 to be mounted catches the outer periphery x of the drive pin 6 shown by the dotted line and pushes it down. In this case, the hub hole 11 engages with the spindle 1 at points A'' and B'' which are different from the normal positions.

However, as described above, since the drive pin 6 is supported at an angle, the upper end surface of the drive pin 6 is tilted in the direction of rotation of the drive pin 6 ( It is tilted downward at an angle θ ₃ in FIG. 13c in the direction of rotation of the disk.

As a result, even if the drive pin 6 that is hooked and pushed down is inclined outward in the radial direction of the disk with respect to the direction perpendicular to the mounting surface of the hub 10 according to the inclination of the elastic member 7, as shown in FIG. The outer periphery y of the upper end surface of the drive pin 6 on the rotation direction side shown in FIG. Therefore, the drive pin 6 does not engage with the hub hole 12, but can slip under the lower surface of the hub 10, as shown in FIG. After making one rotation, it enters the region of the hub hole 12, rises due to the force of the elastic member 7, and fits into the hub hole 12, and then engages with the hub hole 12 at the above-mentioned regular points C and D.

Due to the positioning caused by this engagement, the spindle 1 also moves from point A'' and point B'' to the aforementioned regular point A,
It engages with the hub hole 11 at point B. In other words, accurate tracking is performed.

As described above, according to this embodiment, accurate tracking is always performed, so that inconvenient phenomena such as surface wobbling of the magnetic sheet during recording and reproduction, instability of the INDEX signal output, and vibration of the elastic member, which conventionally occur, can be avoided. can be prevented.

As described above, the configuration of the present invention is such that the pin member (drive pin 6) that engages with the disk member to perform chucking is supported so as to be tilted in the direction of rotation of the disk member with respect to the direction perpendicular to the disk member mounting surface. The present invention is not limited to the above-mentioned embodiments, but can be applied to all types of disk member chucking mechanisms mentioned at the beginning.

Further, the elastic member supporting the pin member is not limited to the plate-shaped one in the embodiment, but other elastic members may be used.

〔effect〕

As is clear from the above description, according to the present invention, the spindle of the motor that drives the disk member and the pin member rotationally driven by the spindle are engaged with the attached disk member to drive the disk member. In the disk member chucking mechanism, the pin member is supported on an inclined side member connected to two sides having height differences of a frame-like elastic body attached to the spindle, so that the pin member is connected to the disk member. The structure is tilted in the direction of rotation of the disk member with respect to the direction perpendicular to the mounting surface, so the structure is easy and inexpensive to implement, preventing mischucking and ensuring accurate chucking at all times with high reliability. A disk member chucking mechanism can be provided.

[Brief explanation of drawings]

Figures 1 to 7 explain the structure and operation of a conventional chucking mechanism. Figure 1 is a top view of the chucking mechanism, Figure 2 is a sectional view taken along the X-Y line in Figure 1, and Figure 3 is a sectional view taken along the X-Y line in Figure 1. The figure is a top view of the elastic member, FIG. 4 is a sectional view taken along line X-Y in FIG. 3, FIG. 5 is a schematic plan view for explaining the operation, and FIG.
A cross-sectional view along the Y line, FIG. 7a is a schematic plan view for explaining mischucking, and FIG. 7b is a schematic plan view of FIG. 7a.
7c is a sectional view taken along the X-Y line of FIG. 7c is a view taken in the Z direction in FIG. Figure 9 is a side view seen from the X direction in Figure 8,
FIG. 10 is a top view of the elastic member, and FIG. 11 is a top view of the elastic member.
12 is a side view seen from the Y direction in FIG. 11, FIG. 13a is a schematic plan view explaining the operation, and FIG. 13b is a side view seen from the Y direction in FIG.
FIG. 13c is a sectional view taken along the X-Y line of FIG. DESCRIPTION OF SYMBOLS 1...Spindle, 2...Spindle flange, 3...Slide sheet, 4...Adsorption magnet, 5...Drive pin shaft, 6...Drive pin, 7...Elastic member, 7a-7d...Side, 8 ……
Dowel, 9...Magnetic sheet, 10...Hub.

Claims (1)

[Claims] 1. In a disk member chucking mechanism that chucks a disk member by engaging a spindle of a motor that drives a disk member and a pin member rotationally driven by the spindle with a mounted disk member, the pin member is connected to the spindle. By supporting the pin member on the inclined side member connected to the two sides having height differences of the frame-like elastic body attached to the frame-shaped elastic body, the rotation direction of the disk member is fixed with respect to the direction perpendicular to the disk member mounting surface. A disc member chucking mechanism characterized in that the disc member is tilted to the opposite side.