JPH0422433Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a disk rotation drive device for reliably rotating a disk such as a floppy disk.

[Prior Art] In a disk rotation drive device that generally uses a 3.5-inch floppy disk, as shown in Fig. 4A, when chucking a magnetic disk, first the metal supporting the magnetic disk is The disk hub a is attracted by a magnet provided on the upper surface of a spindle hub (not shown). Then, insert the spindle shaft c into the center hole b provided in the disk hub a, and insert the drive pin e whose lower end is supported by a spring holding member into the drive hole d, as shown in FIG. 4B. That's what I do.

In such a conventional disk rotation drive device, when the magnetic disk is rotated, the drive pin e
Disc hub a is generated by using the reaction force of drive pin e that occurs when the drive pin a contacts the corner of drive hole d.
The floppy disk is positioned with respect to the spindle shaft c by pressing the spindle shaft c against a specific corner of the center hole b.

And to do it like this, drive pin e
The spring holding member holding the I was trying to encourage it.

[Problems to be solved by the invention] However, in the conventional disk rotation drive device, the spring means that biases the drive pin e in the horizontal direction varies due to tolerances that are difficult to avoid during manufacturing, and if this is weak, During positioning, there is a risk that the drive pin e may escape as shown by the arrow X in Fig. 4C due to fluctuations in the load torque of the magnetic disk, and the positional relationship between the drive pin e and the drive hole d may change. It was hot. Further, even if the force of the spring means is too strong, it does not balance with the chucking force of the magnet, and the rotational reliability deteriorates.

This invention was devised in view of the above-mentioned circumstances, and the purpose of this invention is to enable subtle adjustment of the chucking state by adjusting the biasing force of the spring member with a simple structure, and to improve manufacturing efficiency. An object of the present invention is to provide a disk rotation drive device that can reduce costs.

[Means for Solving the Problems] In order to solve the above-mentioned problems and achieve the purpose, the disk rotation drive device according to this invention includes a drive motor and a drive pin that engages with the drive hole of the disk hub. a horizontal plate spring part which is pivotally supported at one end, has a through hole formed at the other end, and has a bent part between it and the drive focus through hole in a direction perpendicular to the direction connecting these; an integral spring member that is bent at right angles to the spring portion and integrally includes a vertical leaf spring portion extending from the other end of the horizontal leaf spring portion; and an integral spring member that is rotationally driven by the drive motor. , a chucking rotary body having a spring abutting portion provided with a horizontal biasing force adjusting screw against which the other end of the vertical leaf spring portion is abutted; It is characterized by having a support shaft that is inserted into the through hole and rotatably supports the support shaft.

[Function] In the disk rotary drive device configured as described above, the integral spring member with the drive pin pivotally supported at one end is supported by the chucking rotating body so as to be rotatable by a predetermined amount. The pin receives a biasing force in the horizontal direction from a vertical leaf spring part bent at right angles to the horizontal leaf spring part on which the pin is pivotally supported, and this horizontal biasing force is applied to the spring abutting part provided on the chucking rotating body. The horizontal biasing force can be adjusted to any desired value using the horizontal biasing force adjustment screw provided in the . In this way, the positioning and driving state of the drive pin can be finely adjusted, and the spring pressure can be adjusted appropriately.

Further, in order to bias the drive pin in the horizontal direction, the drive pin is made of an integral spring member integrally formed from a horizontal leaf spring part and a vertical leaf spring part.
Since it is integrally supported by the horizontal plate spring, there is no need for a separate biasing force generating means such as a coil spring, which reduces the number of parts, improves ease of assembly, and reduces manufacturing costs. This makes it possible to reduce the cost.

[Embodiment] The structure of an embodiment of the disk rotation drive device according to the present invention will be described in detail below with reference to FIGS. 1A to 4C of the accompanying drawings.

Disk rotation drive device 10 of this embodiment
As shown in FIG. 1, the spindle shaft 12 is rotatably driven by a drive motor (not shown). A rotary drive disk 14 is coaxially fixed to the upper part of the spindle shaft 12 with its upper end projecting upward. One surface of this rotary drive disk 14, that is,
A substantially ring-shaped rubber magnet 20 is attached to the spindle shaft 1 on the surface facing the metal disk hub 18 provided at the center of the floppy disk 16.
It is arranged coaxially with the rotation axis of No. 2. This magnet 2
0 attracts the disk hub 18 of the floppy disk 16 mounted on the rotation drive device 10 to the rotation drive disk 14 via a magnet, and drives the floppy disk 16 according to the rotation of the spindle shaft 12 as described below. It is provided to cooperatively drive the pin 22 in rotation.

The floppy disk 16 is rotatably housed in a hard case (not shown), and the lower surface of the disk hub 18 fixed to the center of the floppy disk 16 is formed at the center of the lower surface of the hard case. It is configured to be exposed to the outside through a through hole. Also, Flotspie disk 16
A substantially rectangular central through hole 18a is formed at the center of rotation of the disk hub 18, through which the upper end of the spindle shaft 12 loosely passes through when the disk hub 18 is attached to the rotational drive device 10. Further, at a position eccentric from the rotation center of the disk hub 18, a drive hole 2 into which a drive pin 22 (described later) is inserted is provided.
4 is formed.

On the other hand, the disk hub 18 is attached to the rotary drive disk 14 with the floppy disk 16 attached thereto.
An elongated hole 26 is formed at a position opposite to the drive hole 24 formed in the. In other words, both the drive hole 24 and the elongated hole 26 are formed so as to be located on an arc of the same radius with respect to the rotation center of the spindle shaft 12, and when both are at the same rotation angle, are configured to communicate with each other. This elongated hole 26 is formed in an arcuate shape having the same center axis as the rotation center of a spring arm 28, which will be described later.

As shown in FIGS. 2 and 3A to 3C, this spring arm 28 is formed into a substantially L-shape, and is attached to the other surface of the rotary drive disk 14, that is, the floppy disk 16. It is attached to the surface opposite to the surface facing the disk hub 18 so as to be rotatable by a predetermined angle. That is, as shown in FIG. 3B, the horizontal portion of the spring arm 28 has a rotation support shaft 3.
A hole 28a is formed into which 0 is inserted. The rotation support shaft 30 is inserted into the hole 28a, and is installed at a position eccentric from the rotation center of the rotation drive disk 14.

Note that an outer flange 30a is formed at the lower end of this rotational support shaft 30.
Due to the presence of 0a, the rotation support shaft 3 of the spring arm 28
Falling off from 0 is prevented.

One spring piece 28b of this spring arm 28 is provided in a state extending within a horizontal plane, and constitutes a horizontal plate spring portion. This one spring piece 28b
The above-mentioned drive pin 22 is fixed to the tip. This one spring piece 28b is
The drive pin 22 is formed from a leaf spring so as to have a biasing force that causes the drive pin 22 to enter the elongated hole 26. That is, this spring arm 28 is attached to the rotary drive disk 14 so as to be rotatable within the range of the elongated hole 26 around the rotational support shaft 30 with the drive pin 22 loosely inserted into the elongated hole 26. It is structured so that it can be used.

Here, as is clear from FIGS. 3B and 3C, this horizontal plate spring portion 28b is located between the drive pin 22 and the hole 28a through which the rotational support shaft 30 is inserted, and is directed in the direction connecting the two. A total of two bent portions 29a and 29b are provided in orthogonal directions. By providing the bent portions 29a and 29b in this way, twisting of the horizontal plate spring portion 28b, on which the bent portions 29a and 29b are provided, is reliably prevented without reducing the rigidity of the horizontal leaf spring portion 28b. The stability of engagement of the drive pin 22 pivotally supported at one end of the drive pin 22 is improved.

Also, the other spring piece 28 of this spring arm 28
c extends substantially orthogonally from the end of the one spring piece 28b on the rotation support shaft side, and is provided upright from the one spring piece 28b, so that the vertical leaf spring part It consists of This other spring piece 28c is formed from a plate spring so as to have a biasing force such that the drive pin 22 comes into elastic contact with the end face of the elongated hole 26.

Note that this is a position eccentric from the rotation center on the other surface of the rotational drive disk 14, and
A spring abutting portion 32 is integrally fixed at a position where the other spring piece 28c of the spring arm 28 attached to the spring arm 28 engages. This spring abutment part 32 has an adjustment member 34 which constitutes an adjustment means so as to be able to move forward and backward thereon.
is attached. When the other spring piece 28c engages with the tip of the adjustment member 34, the other spring piece 28c is elastically deformed, and the drive pin 22
The biasing force that biases the horizontal direction will be charged.

On the other hand, by moving the adjustment member 34 forward and backward from the spring abutment part 32, the amount of bending of the other spring piece 28c is changed, and therefore the biasing force thereof is adjusted. In this embodiment, the adjusting member 34 is composed of an adjusting screw, and by rotating this adjusting screw with a tool such as a screwdriver, the amount of movement of the adjusting member 34 is regulated.

Floppy disk 1 configured as above
The operation of the rotation drive device 10 of No. 6 will be explained below.

When a hard case containing a built-in floppy disk 16 is inserted through an insertion port (not shown) of the rotary drive device 10, the rubber magnet 20 on the top surface of the rotary drive disk 14 applies magnetic force to the metal disk hub 18. The upper end of the spindle shaft 12 is inserted into the center hole 18a of the disk hub 18, and the center of rotation is determined.

When the drive motor serving as the drive source is activated, the spindle shaft 12 is rotationally driven, and the rotation drive disk 14 fixed to the spindle shaft 12 and the spring arm 28 attached to the rotation drive disk 14 are rotated. also rotates as one. These rotations cause the drive pin 22 attached to the spring arm 28 to be inserted into and engaged within the drive hole 24 of the disk hub 18 in a manner similar to that described in the prior art with reference to FIGS. 4A-4C.

Here, in the state shown in FIG. 4A, the drive pin 22 comes into contact with the lower surface of the disk hub 18, so it resists the biasing force of one spring piece 28b of the spring arm 28, as shown in FIG. 1B. As shown, it will be pushed down. In this depressed state, the spring arm 28 of this embodiment is
Since it is composed of only one spring piece 28b that extends horizontally from the rotation support shaft 30 to the end where the drive pin 22 is attached, the drive pin 22 can be pushed downward without twisting. Become.

In this way, according to this embodiment, the rotation of the spindle shaft 12 causes the drive pin 22 to move into the drive hole 2, as shown in FIG. 4B.
Since the drive pin 22 is not twisted when facing the drive hole 24, the drive pin 22 can be inserted well into the drive hole 24, and the insertion operation can be performed reliably.

Then, from the state shown in Fig. 4B mentioned above,
Further, the spindle shaft 12 rotates, and the 4th C
In the state shown in the figure, the drive pin 22 supported by the spring arm 28 that rotates together with the rotary drive disk 14 is located outside the tip of the drive hole 24 of the disk hub 18 in the direction of rotation. It is located at a corner and rotates around a spindle shaft 12. On the other hand, due to this rotation, the spindle shaft 12 is pressed into contact with a specific corner of the rectangular central through hole 18a, so that the floppy disk 1 is pressed against the spindle shaft 12.
6 will be held in the proper position.

With the floppy disk 16 chucked in the proper position in this way, a magnetic head (not shown) comes into contact with each track, thereby performing a write/read operation.

At this time, the biasing force in the horizontal direction of the spring arm 28 is adjusted to an appropriate value, and the spring arm 28 is pivotally supported by a spring piece 28b, which is a horizontal leaf spring part, and is supported by a spring piece 28b, which is a vertical leaf spring part. 28c, the biasing force of an appropriate value acts on the drive pin 22 without causing any twisting. Therefore, the drive pin 22 does not move up from the intended position or shift. There is no possibility that the rotary drive reliability will deteriorate due to the drop.

In this manner, according to this embodiment, there is no possibility that the positioning accuracy of the rotary drive disk 14 with respect to the disk hub 18 will be degraded, and highly accurate disk rotation performance is guaranteed.

Furthermore, even if the drive pin 22 is subjected to an unreasonable force that resists its horizontal biasing force during the initial installation of the disk, during the assembly inspection process, etc., the spring arm 28 can rotate around the rotation support shaft 30. Since the spring arm 28 rotates and releases the above-mentioned unreasonable force, the spring arm 28
No unnecessary force is applied to 8, no deformation occurs, and no problem occurs.

Further, the spring abutting portion 32 is provided with an adjusting member 34 that adjusts the biasing force of the other spring piece 28c of the spring arm 28. By adjusting the biasing force of the other spring piece 28c using this adjustment member 34, the elastic contact force of the drive pin 22 to the end face of the elongated hole 26 is adjusted, and the subtle force is adjusted to maintain the initial spring force. Adjustment is possible.

Furthermore, by integrally forming the spring arm 28 on which the drive pin 22 is pivotally supported from a plate spring, the number of parts can be reduced compared to a configuration in which a biasing force generating means such as a coil spring is separately connected. As a result, manufacturing costs can be reduced. The cost reduction based on such a reduction in the number of parts is insignificant when focusing on a single part, but the effect becomes significant when mass-produced.

Furthermore, after the drive pin 22 is pivotally supported by the spring arm 28, the work of attaching the spring arm 28 to the drive device is extremely simple, simply by inserting the rotation support shaft 30 into the through hole 28a. As a result, work efficiency has been improved, automation technology can be applied, and manufacturing costs can thus be reduced.

This invention is not limited to the configuration of the above-mentioned embodiment; for example, an eccentric pin may be used as the adjustment means, and the pin support member may integrate the horizontal spring portion as in the above embodiment. It goes without saying that it may be made into a separate piece instead of a separate piece, and various modifications can be made without departing from the gist of the invention.

[Effects of the invention] As detailed above, the disk rotation drive device according to this invention includes a drive motor and a drive pin that engages with the drive hole of the disk hub, which are pivotally supported at one end, and a through hole at the other end. a horizontal leaf spring part formed with a bent part in a direction orthogonal to a direction connecting these parts, and a horizontal leaf spring part provided with a bent part in a direction perpendicular to a direction connecting these parts;
An integral spring member that is bent at right angles to the horizontal leaf spring part and integrally includes a vertical leaf spring part extending from the other end of the horizontal leaf spring part, and is rotationally driven by the drive motor. and a chucking rotary body having a spring abutting portion provided with a horizontal biasing force adjusting screw against which the other end of the vertical leaf spring portion abuts, and a chucking rotary body which is implanted in the chucking rotary body and which is attached to the integrated body. The spring member is characterized by having a support shaft that is inserted into a through hole of the spring member and rotatably supports the spring member.

Therefore, according to this invention, by adjusting the biasing force of the spring member with a simple structure, it is possible to finely adjust the chucking state, and at the same time, the manufacturing cost can be reduced. A drive will be provided.

[Brief explanation of drawings]

FIG. 1A is a cross-sectional view showing the configuration of essential parts of an embodiment of a disk rotation drive device according to this invention; FIG. 1B is a cross-sectional view showing the configuration of the main part of an embodiment of a disk rotation drive device according to this invention; FIG. 1B is a cross-sectional view of the drive device shown in FIG. 2 is a bottom view showing the state in which the spring arm is attached to the lower surface of the rotary drive disk;
3A to 3C are a side view, a top view, and a front view showing the configuration of the spring arm, respectively; FIGS. 4A to 4C are plan views sequentially showing the chuck operation; and FIG. 5 is a conventional spring arm. FIG. 3 is a perspective view showing the configuration of an arm. In the figure, 10... Drive device, 12... Spindle shaft, 14... Rotating drive disk, 16... Floppy disk, 18... Disk hub, 18a
... Central hole, 20 ... Rubber magnet, 22 ... Tribe pin, 24 ... Drive hole, 26 ... Long hole, 28 ... Spring arm, 28a ... Hole, 28b
...One spring piece, 28c...The other spring piece, 2
9a, 29b...Bending portion, 30...Rotation shaft, 3
2...Spring abutment part, 34...Adjustment member.

Claims (1)

[Claims for Utility Model Registration] A drive motor and a drive pin that engages with a drive hole of a disk hub are pivotally supported at one end, a through hole is formed at the other end, and these pins are connected between the drive pin and the drive pin through hole. A horizontal leaf spring part with a bending part in a direction perpendicular to the direction in which the horizontal leaf springs are connected, and a vertical leaf spring that is bent at right angles to the horizontal leaf spring part and extends from the other end of the horizontal leaf spring part. a spring abutment part that is rotationally driven by the drive motor and is provided with a horizontal biasing force adjustment screw that the other end of the vertical plate spring part abuts; A disc comprising: a chucking rotary body; and a spindle, which is implanted in the chucking rotary body and is inserted into a through hole of the integral spring member to rotatably support the chucking rotary body. Rotary drive device.