JPH07182752A - Chucking mechanism and flexible disk device - Google Patents

Abstract

PURPOSE:To obtain an easily assemblable chucking mechanism at low cost, suitable for making a flexible device thin structive by reducing the number of parts. CONSTITUTION:An arm 12 provided integrally with a driving pin 7 in contact with a part of a rotor yoke and a regulating part 8 for allowing this arm 12 to move in the rotating direction and in the outer circumferential direction on the rotor yoke 11 and regulating the movement of the driving pin are provided on a chucking surface 6. Both ends of the arm 12 are disposed underneath a chucking magnet 13. By this method, a leaf spring is not required, and the number of parts can be reduced, and also the assemblage can be facilitated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chucking mechanism for a flexible disk device (hereinafter referred to as FDD).

[0002]

2. Description of the Related Art FIG. 30 and FIG.
2 is a plan view showing a conventional chucking mechanism disclosed in Japanese Patent Laid-Open No. 2-57956, in which 1 is a hub integrally provided in the center of a recording medium, and 2 is a center of the hub 1. A square-shaped central hole, 3 is a driving hole provided in a substantially rectangular shape at a position deviated from the center of the hub 1, 4
Is a drive motor, 5 is a rotary shaft of the drive motor 4, 6 is a chucking surface provided integrally with the rotary shaft 5, and 7 is a drive for rotating the recording medium by rotating integrally with the chucking surface 6. A pin, 8 is a restricting portion that restricts the swing of the drive pin 7, 9 is a leaf spring that supports the drive pin 7, and is integrally provided on the chucking surface 6, and 10 is an escape groove for the drive pin 7. is there.

Next, the operation will be described. Drive motor 4
In the process in which the recording medium is loaded into the predetermined position by starting rotation of the recording medium, the hub 1 of the recording medium has the center hole 2 of the rotation shaft 5
While being fitted, the drive pin 7 is pressed and the leaf spring 9 elastically deforms in the direction perpendicular to the paper surface, so that the drive pin 7 descends together with the hub 1, and finally the hub 1 pushes down the drive pin 7. The chucking surface 6 is brought into contact with the chucking surface 6 in the state of being held.

Since the chucking surface 6 is rotating clockwise in the drawing, the driving pin 7 slides on the surface of the hub 1 and eventually fits into the driving hole 3 with this rotation. At the same time, the drive pin 7 is pushed up by the restoring force of the leaf spring 9. The leaf spring 9 holds the drive pin 7 so that the drive pin 7 can be moved vertically and horizontally to the left and right. In this state, the drive pin 7 continues to rotate and pushes against two edges of the drive hole 3, and the rotation reaction force generated at this time causes the drive pin 7 to move.
Moves in a counter-rotational direction with respect to the chucking surface 6 and abuts against the restriction portion 8. After hitting, the drive pin 7 continues to move along the inclination of the restricting portion 8 and is determined at three places in contact with the drive pin 7, that is, two edges of the driving hole 3 and one place of the restricting portion 8. The center hole 2 is pressed against one of the rotating shafts 5 by the centering force generated at this time, the hub 1 is centered, and the chucking operation of the recording medium is completed. After that, the rotational force of the drive motor 4 is transmitted to the hub 1 via the drive pin 7 and the drive hole 3 to rotate the recording medium. The reason why the drive pin 7 must be able to move to some extent as described above is to absorb the positional accuracy of the center hole 2 and the drive hole 3 in the hub 1 of the recording medium and the error in the size of each part.

[0005]

Since the conventional chucking mechanism is constructed as described above, the chucking mechanism has a large number of parts due to the leaf spring 9 and the escape groove 10 and secures a necessary arrangement space. It is difficult to suppress the height of the drive motor to a low level, which is an obstacle to making the drive motor thinner and thus the FDD itself. In addition, it is difficult to reduce the number of parts and to assemble it, which makes it difficult to reduce the cost.

The present invention has been made in order to solve the above problems, and provides a chucking mechanism which has a small number of parts, is easy to assemble, is inexpensive, and is suitable for thinning, and a chucking mechanism therefor. The purpose is to obtain the used flexible disk device.

[0007]

SUMMARY OF THE INVENTION The present invention provides a chucking mechanism for chucking a medium having a bearing and an engaging portion, which includes the following elements. (A) A mounting portion that has a mounting surface on which a medium is mounted and rotates, (b) a shaft that is provided in the mounting surface and that engages with a bearing of the medium and serves as a center of rotation, and (c) the mounting surface. A drive pin that is provided at a position different from the shaft and engages with an engaging portion of the medium; (d) the drive pin is held on the mounting surface, and the drive pin is within a predetermined range within the mounting surface. Holding means for movably holding, (e) When the drive pin engages with the engaging portion of the medium, a restricting portion that abuts the drive pin to move the drive pin in the outward direction of rotation.

The holding means holds the drive pin, an opening in which a part of the mounting surface is opened, the arm is held in the opening, and the arm is slidable along the surface of the mounting surface. It is characterized in that it is provided with a support portion for supporting the.

The supporting portion is characterized in that it is formed by using a part of the mounting surface that was in the opening.

The arm is characterized by using an elastic body at least in a part thereof.

The support portion is provided at a position where the elastic body used for the arm is easily deformed in order to incline the drive pin with respect to the mounting surface.

The starting pin has a hollow portion, and the holding means engages with a small hole provided on the mounting surface and the hollow portion of the drive pin so that the drive pin is mounted on the mounting surface through the small hole. It has a spring member attached to.

The holding means includes a small hole provided on the mounting surface,
It is characterized in that it is provided with a mounting piece provided on the back side of the mounting surface and a connecting portion for connecting the drive pin and the mounting piece via the small hole.

The holding means is further characterized in that it is provided with an opening which is continuous with the small hole and into which the mounting piece is inserted from the front side of the mounting surface.

The drive pin has a hollow portion, and the holding means has a small hole provided on the mounting surface, a fixed shaft provided in the hollow portion, and the fixed shaft on the mounting surface through the small hole. It is characterized by comprising a fixing member for fixing.

The drive pin has a hollow portion, and the holding means has a post fixed to the mounting surface and passing through the hollow portion.

The chucking mechanism is characterized by further comprising a chucking magnet which covers at least a part of the opening between the mounting surface and the medium.

The restriction portion is characterized by being formed by bending a part of the mounting surface.

Further, the present invention is a chucking mechanism for chucking a medium having a bearing and an engaging portion, which is provided with the following elements. (A) a rotating mounting portion having a mounting surface on which a medium is mounted; (b) a shaft which is provided in the mounting surface and which engages with a bearing of the medium and serves as a center of rotation;
(C) A drive pin that is provided at a position different from the shaft in the mounting surface and engages with an engaging portion of the medium, and (d) holds the drive pin on the mounting surface and rotates the drive pin. A holding means for holding the outer rear of the movable body.

The holding means has a longitudinal hole provided on the mounting surface toward the outer rear side of the rotation, and an attaching means for attaching the drive pin to the longitudinal hole so as to be movable along the longitudinal hole. And

The drive pin has a longitudinal hollow portion, and the holding means extends toward the outer rear side of the rotation on the mounting surface and is provided in the longitudinal hollow portion with respect to the mounting surface. It is characterized in that it has a plate stand that is attached so as to be movable outward and rearward of rotation.

The mounting portion is a rotor yoke.

The holding means is characterized in that the drive pin is attached from one side of the mounting surface.

Further, the present invention is characterized in that, in a chucking mechanism having a drive pin for driving the medium by engaging with an engaging portion of the medium, the drive pin is rotatably attached.

Further, according to the present invention, in a chucking mechanism provided with a drive pin which engages with an engaging portion of a medium to drive the medium, an inclined surface is provided between an upper surface and a side surface of the drive pin. Is characterized by.

Further, according to the present invention, in a chucking mechanism provided with a drive pin that engages with an engaging portion of the medium to drive the medium, the drive pin is slidably held on a mounting surface on which the medium is mounted. It is characterized by

Further, the present invention is a flexible disk device having the chucking mechanism.

[0028]

The chucking mechanism of the first invention is characterized in that the drive pin is held on the mounting surface. In the conventional chucking mechanism, a spring for holding the drive pin or a special member is required, but in the present invention, since the drive pin is held by using the mounting surface, the number of parts is reduced. A chucking mechanism that reduces the number of parts and facilitates assembly. Further, since the drive pin is moved outward in the rotation direction by the restricting portion, it is not necessary for the holding means itself to have a function of urging the drive pin in the rotation outward direction, and the holding means itself can be easily configured.

In the second invention, the holding means has an arm to which the drive pin is fixed, an opening for mounting the arm, and a supporting portion. Since the arm is slidably supported by the support portion, the drive pin is movably held on the mounting surface until it comes into contact with the regulation portion.

In the third aspect of the invention, since the support portion is formed by using a part of the mounting surface which is no longer needed to form the opening portion, no special member is required for the support portion. .

According to the fourth aspect of the invention, since the arm is made of the elastic body, when the chucking mechanism mounts the medium, the elastic body of the arm is deformed and the drive pin does not interfere with the mounting of the medium. .

In the fifth aspect of the invention, since the support portion is provided at the position where the elastic body is easily deformed, the drive pin is tilted when the medium is mounted, so that the medium can be inserted more easily.

In the sixth aspect, the spring member attaches the drive pin through the small hole on the mounting surface. The spring member engages the hollow portion of the drive pin and movably mounts the drive pin on the mounting surface. The feature here is that the hollow part of the drive pin and the spring member are engaged, and the drive pin is slidably mounted on the mounting surface by the hollow part of the drive pin and the spring member. is there.

In the seventh invention, the drive pin is attached to the mounting surface by using the attachment piece and the connecting portion. The drive pin is slidably mounted on the mounting surface by making the diameter of the small hole through which the connecting portion provided on the mounting surface penetrates larger than the diameter of the connecting portion.

In the eighth aspect of the invention, since the mounting piece is inserted from the opening connected to the small hole to mount the drive pin, the drive pin can be mounted from the side of the mounting surface.

According to the ninth aspect of the invention, the fixed shaft is fixed to the mounting surface by using a fixing member, and the hollow portion of the drive pin is engaged with the fixed shaft to slide the drive pin on the mounting surface. It is possible to install.

In the tenth aspect of the invention, the drive pin is slidably mounted on the mounting surface by engaging the hollow portion of the drive pin with the post fixed to the mounting surface.

In the eleventh aspect of the invention, since the chucking magnet covers the opening, the chucking magnet can also be used to close the opening, which is necessary after attaching the drive pin.

In the twelfth aspect of the invention, since the regulating portion is formed by bending a part of the mounting surface, no special member is required for the regulating portion.

The thirteenth aspect of the invention is characterized in that the regulating portion is eliminated. Since the holding means itself holds the drive pin so as to be movable in the outer direction of rotation, the drive pin can be slid in the outer direction of rotation without providing the restriction portion.

In the fourteenth aspect of the present invention, since the drive pin is attached to the longitudinal hole that can move rearward of the rotation, the drive pin and the engagement portion of the medium are engaged with each other so that the drive pin moves on the mounting surface. Slide along the longitudinal hole to the outside of the rotation and rearward.

In the fifteenth aspect of the invention, a plate stand is provided on the mounting surface, and the surface of the plate stand is provided in parallel with the outer rear side of the rotation. The drive pin has a longitudinal hollow that engages the surface of the plate stand. Therefore, due to the engagement between the drive pin and the engaging portion of the medium, the drive pin slides on the mounting surface along the surface of the plate stand to the outer side of the rotation.

In the sixteenth invention, since the rotor yoke which rotates by the rotation of the motor can also serve as the above-mentioned mounting portion, the number of parts can be reduced.

In the seventeenth aspect of the invention, since the drive pin can be attached from one side of the mounting surface, the work of attaching the drive pin becomes easy.

In the eighteenth aspect, since the drive pin itself can rotate, it is easy to engage with the engaging portion of the medium at the correct position. Further, when a force is applied to the drive pin, the drive pin itself rotates to absorb the force. Therefore, when the medium is mounted, the medium is not damaged.

In the nineteenth aspect of the invention, since the drive pin has the inclined surface between the upper surface and the side surface, the medium is not damaged when it is mounted.

In the twentieth aspect of the invention, since the drive pin is supported by the mounting surface, no special member for supporting the drive pin is needed.

A twenty-first invention uses the above-mentioned chucking mechanism in a flexible disk device,
The flexible disk device can be easily assembled.

[0049]

【Example】

Example 1. An embodiment of the present invention will be described below with reference to the drawings. 1 is a plan view of the chucking mechanism in the present embodiment, FIG. 2 is a side view seen from the arrow E in FIG. 1, and FIG. 3 is a sectional side view of a section DD in FIG. In FIG. 1, 11 is a rotor yoke for generating the rotational force of the drive motor 4, 12 is an arm integrated with the drive pin 7, 13 is a chucking magnet provided around the chucking surface 6 on the rotor yoke, 2, 14 is a rotor yoke support portion A that supports one end of the arm 12, 15 is a rotor yoke support portion B that supports the other end of the arm 12, and 16 is a position apart from the center line of the arm 12 in FIG. The rotor yoke support portions C and 17 that support a part of the lower surface of the drive pin 7 are substrates on which electronic components that also serve as support members such as bearings of the drive motor 4 are arranged.

FIG. 4 is a view showing an arm pin in which the drive pin 7 and the arm 12 are combined. 4A is a plan view of the arm pin, FIG. 4B is a side view seen from an arrow F, and FIG. 4C is a side view seen from an arrow G.

FIG. 5 is a view showing the rotor yoke 11 from which the arm 12 integrated with the drive pin 7 is removed. 1
Numeral 00 is an opening formed by cutting out a part of the rotor yoke 11. The support portion B15 is formed by bending a part of the rotor yoke, which is no longer needed due to the opening 100, in a tongue shape, and is provided in parallel with the surface of the rotor yoke 11. Further, the regulating portion 8 also has the opening 10
The part of the rotor yoke that is no longer needed because it is zero is shown in FIG.
In, it is created by bending in the front direction perpendicular to the paper surface. 101 is an opening. The support portion A14 is formed by bending a part of the rotor yoke when the opening portion 101 is opened.
It is provided in parallel with the surface of No. 1.

FIG. 6 is a plan view of the chucking magnet 13. Reference numeral 13a is a covering portion that covers a part of the opening 100 provided in the rotor yoke 11.

As shown in FIG. 4, the arm pin is the arm 1
2 and drive pin 7. The arm and the drive pin may be integrally molded, or separately manufactured may be bonded later. Also,
It is desirable that the material be durable, and it is most desirable to use a metal, for example. In particular, since the drive pin 7 slides on the flexible disk, it is desirable to use a metal that does not wear. On the other hand, from the viewpoint of making the arm pin, it is desirable to integrally make the arm and the drive pin. In such cases,
It is desirable to use plastic. Alternatively, nylon or Delrin may be used.

As shown in FIG. 4, one of the arms 12 has a thin arm end 12a and a thick arm end 12b. As will be described later, the arm end 12a passes under the restriction portion 8 and rides on the support portion A14. Therefore, it is desirable to make the arm end 12a as thin as possible in order to reduce the thickness of the chucking mechanism.

Next, the rotor yoke will be described. As shown in FIG. 5, the rotor yoke is provided with openings 100 and 101. Also, the support portion A14 and the support portion B
15 is created by bending a part of the unnecessary part due to the openings 101 and 100, and the regulating part 8 is also created by bending a part of the unnecessary part due to the opening 100. To be done. For this reason, it is desirable to use an iron material or a steel material that does not easily deform and does not change its position or shape after being processed once.

The chucking magnet 13 has a shape as shown in FIG. 6, and is magnetized to attract a recording medium such as a flexible disk. For example, a rubber sheet is magnetized and adhered to the surface of the rotor yoke 11 around the chucking surface 6. Further, the covering portion 13a covers a part of the opening 100, and the arm 12 covers the opening 100.
I try not to get out. Therefore, it is desirable that the chucking magnet 13 has a certain strength.

Next, the assembly will be described. At the time of assembling, first, as shown in FIG.
An arm 12 integrated with the drive pin 7 is placed near 15. As shown in FIG. 7, for example, the width of the opening 100 is 3
mm. On the other hand, the width of the arm 12 is 2 mm, and when the arm 12 is placed at the center of the opening 100, a gap of 0.5 mm can be provided on both sides. In this way, the arm 12 can move 0.5 mm to the left and right with respect to the paper surface in the opening 100. Or in other words, the arm 12 has a maximum of 1 mm to the left and right.
It is possible to slide.

Next, the arm 12 is passed in the circumferential direction so that the arm end 12a of the arm 12 passes through the regulating portion 8 and the supporting portion A14.
The driving pin 7 moves to a position where it comes into contact with the regulating portion 8 or a position near the regulating portion 8 after a state of riding on the vehicle. Arm 1 at this point
2 will be supported by the support part A14 and the support part B15. Further, the support portion C16 is in a state of supporting the protruding portion 7a of the drive pin 7 shown in FIG. In this way, the arm 12 is supported by the three supporting portions A, B, and C, so that the arm 12 is movably attached to the left and right within the opening 100 with a maximum of 1 mm. Finally, the chucking magnet 13 is attached around the chucking surface 6, and one end of the arm 12 located on the rotor yoke support B15 is covered to complete the assembly.
The state shown in FIG. 1 is obtained.

By attaching the chucking magnet 13, the arm 12 cannot return to the state where it is first placed on the rotor yoke as shown in FIG. It is attached so that it can move up and down.

Next, the operation will be described with reference to FIGS. When the recording medium is loaded and the central hole 2 is engaged with the rotary shaft 5, the drive pin 7 eventually fits into the drive hole 3 as the chucking surface 6 rotates. Directly, drive hole 3-2
The sides abut on two points X and Y of the drive pin 7. The operation up to this point is the same as the conventional one, and this state is shown in FIG. Due to the rotational reaction force generated at this time, the hub 1 causes the arm 12 integrally formed with the drive pin 7 to circumferentially rotate the rotor yoke support portion A1.
4, B15, C16 are slid and moved until they hit the point Z of the restriction portion 8, and the hub 1 as shown in FIG. 9 is in the centered state, that is, the chucking completed state.

As shown in FIG. 7, the regulating portion 8 is bent at an angle of 25 to 55 degrees with respect to the radial direction. Therefore, when the drive pin 7 is pressed against the regulation portion 8, the force for moving the drive pin in the outer circumferential direction continues to act on the drive pin. Therefore, the center hole 2 is pressed against one of the rotating shafts 5, and the hub 1 is centered.

The angle formed by the restricting portion 8 and the radial direction determines how much the driving force of the driving pin should be distributed between the rotational force and the circumferential force. When the angle is small, the rotating force is increased, and when the angle is large, the force in the outer circumferential direction is increased. It is considered desirable to set this angle to 45 ° ± 10 ° as an angle at which the force in the outer circumferential direction can be appropriately generated while maintaining the force in the rotational direction. In particular, 35 ° ± 0.5 ° is considered to be appropriate as an angle at which the force in the outer circumferential direction can be appropriately obtained while maintaining the force in the rotational direction.

As described above, in this embodiment, the drive motor for rotating the recording medium, the rotor yoke for generating the rotational force of the drive motor, the rotary shaft of the drive motor,
A chucking surface integrally fixed to the rotating shaft for mounting the recording medium, a chucking magnet provided around the chucking surface, and the chucking surface are rotated together to rotate the recording medium. In a chucking mechanism including a drive pin for driving, an arm that is in contact with at least a part of the rotor yoke and is provided integrally with the drive pin, and that is movable on the rotor yoke in a rotational direction and an outer peripheral direction, and on the chucking surface. It is characterized in that a regulation portion for regulating the movement of the arm is provided, and both ends of the arm are arranged below the chucking magnet.

According to this embodiment, since the recording medium is chucked by the movement of the arm provided integrally with the drive pin, a member such as a leaf spring is unnecessary. At the time of assembly, the arm may be placed on the rotor yoke and slightly slid in the circumferential direction, and then the chucking magnet may be attached. Further, since the drive pin does not move up and down in the axial direction, the space required for the movement is unnecessary. Thus
The number of parts can be reduced and the cost can be reduced as compared with the conventional one, and the assembly can be facilitated and the thickness can be reduced.

Example 2. In the first embodiment, the arm 12 may be made of a member having elasticity. Arm 12
Is composed of an elastic member, the mounting force (force to push the driving pin 7 downward) applied to the upper surface of the driving pin 7 via the hub 1 when the recording medium is mounted
The arm 12 tends to deform as shown in FIG. Looking at the behavior of this deformation in more detail, the arm 12 bends around the rotor yoke support portion A14 and the support portion B15 as a fulcrum, and tends to push down the vicinity of the drive pin 7. However, since the support portion C16 of the rotor yoke is provided on the lower surface of the protruding portion 7a of the drive pin 7, a moment acts on this support portion C near the drive pin 7 as a fulcrum, and as a result, as shown in FIG. The drive pin 7 is inclined so as to be lowered in the inner circumferential direction. Therefore, as shown in FIG. 11, the lower surface of the hub 1 and the upper surface of the drive pin 7 are in contact with each other.

From the point of deforming the arm, the supporting portion A1
4 and the support portion B15 are preferably separated from each other as far as possible in a range where the arm is continuously supported.

When the arm is made of an elastic body as described above, it is possible to use plastic or hard rubber as a member of the arm. However, when such a plastic or hard rubber is used, it is desirable that the drive pin is made of a separate non-abrasive member so that the two are joined, because the wear is severe.

As described above, in this embodiment, both ends of the arm and a part of the lower surface of the drive pin at a position apart from the center line of the arm are supported in contact with a part of the rotor yoke.
The arm is elastic.

According to this embodiment, the both ends of the arm are made of elastic members, and the lower surface of the drive pin at a position apart from the center line of the arm is supported by a part of the rotor yoke. This elastic portion is bent by the pressing pressure when it is mounted, and a moment is generated about the rotor yoke supporting portion of the lower surface of the drive pin as a fulcrum, and the upper surface of the drive pin is inclined toward the center of the chucking surface. As a result, the top surface of the drive pin comes into surface contact with the hub surface of the recording medium, and it is possible to suppress the progress of wear due to one-sided contact. Material such as plastic material can be selected. As a result, further cost reduction can be realized.

Example 3. FIG. 12 is a diagram showing another example of the arm 12. The arm 12 shown in FIG. 12 is characterized in that the entire drive pin 7 is placed on the arm. Therefore, there is no portion that engages with the support portion C as described above. The arm 12 is supported by the support portion A and the support portion B and is movable. Also, the arm 12 shown in FIG. 12 has the same thickness at both arm ends 12a and 12b. It does not matter even if the thickness is not changed.

Next, FIG. 13 is a diagram showing another example of the arm. The shape of the arm may be a rectangular parallelepiped as shown in FIG.

FIG. 14 is a diagram showing another example of the drive pin 7. The drive pin 7 is composed of a body 7b of the drive pin and a ring 7a. The drive pin 7 slides on the flexible disk as described above. Therefore, the drive pin may become worn. Therefore, a ring 7a is provided to reinforce the drive pin. As a material for this ring, for example, a steel material called SUS303 is used. By thus forming the ring using a material having excellent wear resistance, the drive pin does not wear even when it slides on the flexible disk. In addition, the side surface portion of the drive pin is also reinforced, so that the drive pin can be properly engaged with the drive hole and accurate positioning can be performed. By providing the ring 7a in this way, it is possible to use a member made of plastic, nylon, Delrin, or the like for the drive pin body portion 7b.
When such a member is used, the arm 12 and the body portion 7b of the drive pin can be integrally formed. Although not shown, a cap that covers up to the upper surface may be used instead of the ring. When the cap is used, the wear resistance of the upper surface of the drive pin is further improved.

Example 4. FIG. 15 is a perspective view showing another embodiment, and FIG. 16 is a sectional view seen from the F direction in FIG. In the figure, 18 is a notch portion provided in the upper two places of the hollow cylindrical drive pin 7, and 19 is a notch portion 18 in which two forked portions are fitted and hooked,
A spring member that bends almost at a right angle to form a U shape
Reference numeral 20 is a small hole provided in a portion of the rotor yoke 11 located inside the cylinder of the drive pin 7. Reference numeral 21 is a rotor yoke 11 for springing the U-shaped portion of the spring member 18.
Is a spring hook portion formed by a press method or the like on the lower surface of the.

At the time of assembly, the notch 1 of the drive pin 7
With the bifurcated portion of the spring member 19 fitted in 8, the U-shaped portion of the spring member 19 is inserted from the small hole 20 of the rotor yoke 11 and hooked and attached to the spring hook portion 21. Therefore, the assembly can be done by a one-touch operation. When the drive hole 3 comes into contact with the drive pin 7 and moves during operation, the small hole 20 has an opening area sufficient for this amount of movement, and within this range, the drive pin 7 has elasticity of the spring member 19. By
The hub 1 is freely movable and comes into contact with the regulating portion 8 to bring the hub 1 into the centered chucking state.

As shown in FIGS. 15 and 16, the spring member 19
Can swing in the direction of arrow I with the spring hook 21 as a fulcrum. The diameter of the small hole is 3 mm and the width of the spring is 2
If the spring is 0.5 mm, the springs are 0.5 mm to the left and right, and the maximum is 1 m.
You can move m. Therefore, the drive pin 7 also has an arrow H.
It is possible to slide on the rotor yoke in the left and right direction by 0.5 mm and the maximum of 1 mm.

As shown in FIG. 16, the spring member 19
By providing the gap S between the distal end of the drive pin 7 and the side surface of the drive pin 7, the drive pin 7 can be slid in the H direction without the spring member 19 deforming. By setting the width of the gap S to be 0.5 mm, the drive pin 7 can be moved in the H direction by 0.5 mm at a time without the spring member being deformed. Even if the gap S does not exist, the drive pin 7 can move in the H direction by swinging the spring member 19 in the I direction as described above. In this way, when the gap S is provided, the spring member can be easily manufactured without giving importance to the manufacturing accuracy of the spring member 19.

Next, FIG. 17 is a plan view of the drive pin and the spring member. The width of the cutout portion 18 of the drive pin 7 is made 1 mm larger than the diameter of the spring member 19. Therefore, the portion where the cutout portion 18 and the spring member 19 are engaged can move up and down by 0.5 mm with respect to the paper surface as shown in FIG. Therefore, the drive pin 7 can freely slide on the rotor yoke in the arrow J direction.

As described above, in this embodiment, the drive motor for rotating the recording medium, the rotor yoke for generating the rotational force of the drive motor, the rotary shaft of the drive motor, and the recording medium for mounting the recording medium are attached. A chucking surface integrally fixed to the rotating shaft, a chucking magnet provided around the chucking surface, and a drive pin for rotating the recording medium by rotating integrally with the chucking surface are provided. In the chucking mechanism, a regulating portion that regulates the movement of the drive pin is provided on the chucking surface, the drive pin is formed in a hollow cylindrical shape, and a rotor yoke having a small hole at a position facing the hollow portion, It is characterized by comprising a spring member engaged with the drive pin and attached to the lower surface of the rotor yoke through the small hole.

According to this embodiment, by the spring member,
Since the drive pin is attached to the rotor yoke, it is easy to assemble, and the hollow cylindrical shape of the drive pin is extremely simple. Therefore, the machining is easy and the cost can be reduced.

Example 5. FIG. 18 is a perspective view showing another embodiment, 22 is a shaft extending from the vicinity of the center of the lower surface of the drive pin 7 and having a plus tolerance length from the plate thickness of the rotor yoke 11, 23 is an end of the shaft 22. A reference numeral 24 denotes a disk provided in the portion, a reference numeral 24 denotes a gourd-shaped hole provided in the rotor yoke 11, and a reference numeral 25 denotes a part of the gourd-shaped hole 24 having a diameter larger than that of the disk 23 and smaller than that of the drive pin 7. Second hole, 26
Is also a first hole having a diameter larger than the diameter of the shaft 22 and smaller than the diameter of the disk 23 in a part of the gourd-shaped hole 24, and 27 is also a diameter of the shaft 22 in a part of the gourd-shaped hole 24. A second hole 25 and a first hole 26 having a width of more positive tolerance.
It is a rectangular hole that connects. 19 is a perspective view of the drive pin 7, and FIG. 20 is an enlarged view of the gourd-shaped hole 24.

As shown in FIG. 20, the disc 23 has a diameter smaller than the diameter of the second hole 25. Also, axis 2
2 has a diameter smaller than the width of the rectangular hole 27.
Therefore, insert the disc 23 of the drive pin into the second hole,
It is possible to slide 2 through the rectangular hole 27 to the first hole 26. The first hole 26 has a diameter of 3 mm and the shaft 22 has a diameter of 2 mm. Therefore, the drive pin can move on the rotor yoke by 0.5 mm in the vertical and horizontal directions.

FIG. 21 is a plan view of a rotor yoke having a gourd-shaped hole 24. As shown in FIG. 21, the angle formed by the longitudinal direction and the radial direction of the gourd-shaped hole 24 is 45 degrees. With such an angle, when the drive pin engages with the drive hole of the flexible disk to rotate the flexible disk, the drive pin does not move from the first hole 26 to the rectangular hole 27. Further, as shown in FIG. 21, the angle formed by the restriction portion 8 and the radial direction is 35 degrees ± 0.5.
The rotation of the rotor yoke 11 causes the drive pin to receive a rotational reaction force and a force in the outer circumferential direction. The rectangular hole 27 of the gourd-shaped hole 24 is preferably provided in a direction in which the rotational reaction force and the force in the circumferential direction are not applied.

At the time of assembly, the disk 23 of the drive pin 7 is inserted into the second hole 25 until the lower surface of the drive pin 7 contacts the surface of the rotor yoke 11. Next, the rectangular hole 27 is passed through so as to slide on the rotor yoke 11, and the first hole 2
The drive pin 7 is moved near the center of 6. In this state, the second hole 25 and a part of the rectangular hole 24 are attached so as to be closed by the chucking magnet 13, and the state is the same as the state shown in FIG. 1, and the assembly is completed. The diameter of the first hole 26 is larger than the diameter of the shaft 22 so as not to hinder the movement of the drive pin 7 required during operation. Therefore, during operation, the drive pin 7 moves as necessary to engage with the drive hole 3, and as a result, the hub 1 is centered and brought into a chucking state.

The drive pin 7 can rotate about the shaft 22 with the structure shown in FIG. This is because the first hole 26 has a circular shape and the shaft 2
This is because 2 itself has a circular shape. With such a structure, the drive pin 7 itself can rotate, and positioning can be performed more reliably when the drive hole 3 contacts the drive pin 7 as compared to when the drive pin 7 does not rotate. When the drive pin 7 and the drive hole 3 first come into contact with each other at one point and friction occurs at that one point, it becomes difficult to make contact with the second point. If the drive pin 7 can rotate, the position where the drive pin 7 and the drive hole 3 contact each other can be easily changed by rotating the drive pin 7 on its own axis. Further, even when the drive pin 7 receives a mounting force or other pressure, the force can be absorbed or dispersed by rotating. In addition, the friction of the drive pin is eliminated, and the wear of the drive pin is reduced.

As described above, in this embodiment, the drive motor for rotating the recording medium, the rotor yoke for generating the rotational force of the drive motor, the rotary shaft of the drive motor,
A chucking surface integrally fixed to the rotating shaft for mounting the recording medium, a chucking magnet provided around the chucking surface, and the chucking surface are rotated together to rotate the recording medium. In a chucking mechanism having a driving pin for driving, a restricting portion that restricts the movement of the drive pin is provided on the chucking surface, and a shaft extending from the center of the drive pin and attached to one end of the shaft. A disk having a diameter smaller than the outer diameter of the drive pin, and a first disk having a diameter smaller than both the diameter of the disk and the diameter of the drive pin in the vicinity where the drive pin contacts the rotor yoke. And a second hole having a diameter larger than the diameter of the disc and a rectangular hole having a width larger than the diameter of the shaft and smaller than the diameter of the drive pin connecting the holes. Characterized in that it is composed of a shape hole.

According to this embodiment, the disk provided at the shaft end of the drive pin is inserted into the second hole on the rotor yoke, and is slid on the rotor yoke through the rectangular hole to form the first hole. Since the drive pin is attached, the assembly is very easy.

Example 6. FIG. 22 is a diagram showing another example of the drive pin. The drive pin 7 includes a plate 7c and a ring 7
It is composed of d and pin 7e. The tip of the pin 7e is joined to the disc 23. Plate 7c and pin 7e
Is made of an iron material such as C3604RD. On the other hand, the ring 7d is made of a material such as Delrin that is more flexible than steel. Further, the rings are the plate 7c and the ring 7d.
It has an inclined portion T between itself and the side surface. This inclined portion T is
This is to prevent the flexible disk from being damaged when the drive pin 7 contacts the flexible disk. Due to the presence of the inclined portion T, the edge of the drive pin 7 disappears and the flexible disk is not damaged. Further, since the plate 7c is made of a steel material, the upper surface of the drive pin 7 is not worn by sliding on the flexible disk.

Example 7. FIG. 23 is a diagram showing another example of the drive pin 7. The drive pin shown in FIG. 23 has a shaft 22, a disk 23, and a screw 23a. The screw 23a is
The shaft 22 and the disc 23 are attached to the drive pin 7. By using the screw 23a in this manner, the drive pin can be slidably mounted on the rotor yoke.
In this case, it is not necessary to provide the second hole 25 or the rectangular hole 27 as described above. However, in the case of this example, when attaching the drive pin 7, the screw 23 must be tightened from the back side of the rotor yoke.

Example 8. FIG. 24 is a sectional view showing the vicinity of a drive pin showing another embodiment. In the figure, the drive pin 7 has a cylindrical outer shape and a counterbore is formed inside. 28 is a fixed shaft inserted into the hole of the drive pin 7 and fixed to the rotor yoke 11, 29 is an elliptical positioning hole provided in the rotor yoke 11, 30 is a part of the fixed shaft, and 30 is a seat of the drive pin 7. A shaft head portion 31 having a diameter smaller than the diameter of the drill hole and larger than the diameter of the center hole 31 is also a part of the fixed shaft 28 and smaller than the diameter of the center hole of the drive pin 7 and larger than the minor diameter of the positioning hole 29. A shaft A portion having a diameter, 32 has a diameter smaller than the minor diameter of the positioning hole 29, and a shaft B portion having a length similar to the plate thickness of the rotor yoke 11, 33 denotes an end portion of the fixed shaft 28. A shaft engaging portion having a cross-sectional shape similar to that of the positioning hole 29 and a cross-sectional area smaller than the opening area of the positioning hole 29. 25 is an enlarged perspective view of only the fixed shaft 28, and FIG. 26 is a plan view of a section KK of FIG.

As shown in FIG. 24, the fixed shaft A portion 3
The diameter of 1 is 2 mm. The diameter of the counterbore provided inside the drive pin 7 is 3 mm. Therefore, when the fixed shaft is fixed to the rotor yoke 11 by the shaft B portion 32 and the shaft engaging portion 33, the drive pin 7 can be arbitrarily moved in the radial direction by the gap between the inner surface of the central hole and the outer surface of the shaft A portion. It becomes possible to move to.

During assembly, with the fixed shaft 28 inserted in the hole of the drive pin 7, the shaft engaging portion 33 is positioned in the positioning hole 29, and the end surface of the shaft A portion 31 is fixed to the rotor yoke 11.
Insert until it hits the surface of. When the shaft head 30 is rotated about 90 degrees while maintaining this state, the rotor yoke 11
Is in a state of being sandwiched between the shaft A portion 31 and the shaft engaging portion 33, and the assembly is completed.

As shown in FIG. 24, the thickness of the rotor yoke is W1, the height of the fixed shaft B portion is W2 as shown in FIG. 25, and W2 is made slightly smaller than W1. As shown, when the shaft engaging portion 33 once tightens the rotor yoke 11, the shaft engaging portion 33 does not easily return to its original position. The fixed shaft head 30 has a notch 3 for rotating the fixed shaft.
0a is provided, and the shaft engaging portion 33 is rotated until it becomes perpendicular to the longitudinal direction of the positioning hole of the rotor yoke by forcibly rotating the cutout portion 30a with a screw driver. In this way, the fixed shaft 28 is fixed to the rotor yoke 11. As described above, the diameter of the central hole of the drive pin 7 is larger than the diameter of the shaft A portion so as not to hinder the movement of the drive pin 7 required during operation. Therefore, drive pin 7
Moves as needed to engage with the drive hole 3, and as a result, the hub 1 is centered and brought into a chucking state. Also in this example, as shown in FIG. 24, the drive pin 7 can rotate about the fixed shaft 28.
This rotation of the drive pin 7 ensures contact with the drive hole at the correct position. Also, the wearing force and other forces can be absorbed and dispersed by rotation. Also,
Rotation reduces wear.

As described above, in this embodiment, the drive motor for rotating the recording medium, the rotor yoke for generating the rotational force of the drive motor, the rotary shaft of the drive motor,
A chucking surface integrally fixed to the rotating shaft for mounting the recording medium, a chucking magnet provided around the chucking surface, and the chucking surface are rotated together to rotate the recording medium. In a chucking mechanism provided with a drive pin for driving, a restricting portion for restricting movement of the drive pin is provided on the chucking surface, and the drive pin has a cylindrical ring on the rotor yoke and an axial direction in which the cylindrical ring is inserted. A fixed shaft having a stopper to prevent the fixed shaft from being inserted into a slotted hole or an elliptical positioning hole provided in the rotor yoke, and having a diameter larger than the minimum diameter of the positioning hole. The portion that abuts against and the portion that is inserted into the positioning hole have a length of about the thickness of the rotor yoke plate, and the minimum diameter of the positioning hole. Has a smaller diameter Ri, part leaving the lower surface of the rotor yoke is characterized by having the positioning hole shape similar cross a and partial opening area thereof is small.

According to this embodiment, since the fixed shaft is inserted into the positioning hole provided on the rotor yoke and then rotated by about 90 degrees, the mounting can be performed, so that the assembly becomes very easy.

Example 9. FIG. 27 is a diagram showing another embodiment. FIG. 27A shows the post 3 on the rotor yoke 11.
9 shows a state in which the control unit 9 and the restriction unit 8 are provided. FIG. 27 (b)
Shows a state in which the drive pin 7 is attached to the post 39. FIG. 27C shows a cross section NN of FIG.
FIG. The diameter of the post 39 is 1 mm smaller than the diameter of the central hole provided inside the drive pin 7. Therefore, the drive pin 7 can move on the rotor yoke in the maximum radial direction of 1 mm centering on the post 39. According to this example, the post 39 is provided on the rotor yoke, the drive pin 7 is inserted into the post, and the top of the post is stopped by the stopper 39a so that the inserted drive pin 7 does not come off. ,
Assembly is complete. The post 39 can also be formed by vertically bending a part of the rotor yoke 11. It is also possible to create it by welding a cylindrical column to the rotor yoke 11. Also in the case shown in FIG. 27, the drive pin 7 can rotate about the post 39 and can be brought into contact with the correct position depending on the engagement with the drive hole 3. Further, the wear of the drive pin 7 can be reduced.

Example 10. FIG. 28 is a diagram showing another embodiment. FIG. 28A is a diagram in which the longitudinal hole 41 is provided in the rotor yoke 11. Further, FIG. 28B is a view showing a state in which the drive pin shown in FIG. 19 is attached to the longitudinal hole 41. Longitudinal hole 41 is 45 degrees ± 1 with respect to the radial direction
The drive pin 7 is present at an angle of 0 degree, and by attaching the drive pin 7 to the longitudinal hole 41, the drive pin 7 is indicated by an arrow L.
It becomes possible to slide on the rotor yoke in the direction of. The direction of the arrow L is 45 ° ± 10 ° with respect to the radial direction. The drive hole 3 is attached to the drive pin attached in this way.
28C, the drive pin contacts the drive hole 3 at points X and Y, and the shaft 22 contacts the longitudinal hole 41 at point Z as shown in FIG. 28 (c). The long hole 41 is
Since the shaft 22 has a tilt of 45 ° ± 10 °, the shaft 22 receives a force in the direction of the arrow M, that is, in the outer circumferential direction. In this way, it is possible to apply a force in the rotation direction and the outer circumferential direction to the drive pin as in the above-described embodiment without providing the regulating portion 8.

Example 11. FIG. 29 is a diagram showing another embodiment. FIG. 29A shows a plate stand provided on the surface of the rotor yoke 11. Also, FIG.
(B) has shown the top view. As shown in FIG. 29 (b), the angle between the surface of the plate stand and the radial direction is 45 ° ± 10 °. FIG. 29C is a plan view of the drive pin 7. Inside the drive pin 7, a longitudinal hollow portion 7g is provided. FIG. 29D shows a state in which the drive pin 7 is attached to the plate stand 42. When the drive pin comes into contact with the drive hole of the flexible disk at the points X and Y, the plate stand 42 and the longitudinal hollow portion 7g come into contact with each other at the surface 42. In this case, since the plate stand has an angle of 45 degrees ± 10 degrees with respect to the radial direction,
The drive pin 7 moves in the direction of arrow M, that is, in the circumferential direction. As shown in FIG. 29C, the width of the plate stand 42 is 2 mm, and the length of the long hollow portion 7g is 3 mm. Therefore,
It is possible to move up to 1 mm. The plate stand 42 can be manufactured by the same method as that of the regulating portion 8 of the above-described embodiment. That is, it can be created by bending the rotor yoke 11. Alternatively, by preparing a special flat plate and welding the flat plate to the rotor yoke 11,
Alternatively, it can be prepared by bonding.

Example 12 In the above embodiment, the chucking mechanism was mainly described, but this chucking mechanism can be used in the flexible disk device.

Example 13 The chucking mechanism may be used in a compact disc device or an optical disc device other than the flexible disc device.

[0100]

As described above, according to the first aspect of the present invention, since the drive pin is held by the mounting surface, the leaf spring and the escape groove are unnecessary. Since the number of parts is reduced as described above, there is an effect that the device is easy to assemble, the cost is low, and the device suitable for thinning is obtained.

According to the second invention, the chucking can be performed by mounting the arm through the opening of the arm and by moving the drive pin by sliding the arm, and by moving the arm with a simple structure of the supporting portion. The mechanism is easier to assemble and thinner than conventional ones.

According to the third invention, it is possible to further reduce the number of parts without preparing a special member for the supporting portion.

According to the fourth invention, by utilizing the elasticity of the elastic body, it is possible to prevent the trouble caused by the contact between the drive pin and the medium.

According to the fifth aspect, since the drive pin can be further tilted, the medium can be mounted without further damaging the medium.

According to the sixth invention, since the drive pin is attached to the rotor yoke by the spring member, the assembly is easy, and the drive pin has only the hollow portion, so that the chucking mechanism can be carried out by an extremely simple process. Can be configured.

According to the seventh aspect of the invention, the chucking mechanism can be realized by the simple operation of simply attaching the drive pin to the small hole.

According to the eighth invention, since the opening is provided, the drive pin can be attached from one side of the mounting surface.

According to the ninth invention, after the fixed shaft is inserted, the fixed shaft can be easily attached using the fixing portion, so that the assembling becomes very easy.

According to the tenth aspect of the invention, the drive pin can be easily attached only by fitting the drive pin into the post provided on the mounting surface.

According to the eleventh aspect, by using the chucking magnet as the lid of the opening, the opening can be covered without increasing the number of parts.

According to the twelfth aspect of the invention, since the regulating portion is formed by partially bending the mounting surface, no special part is required for the regulating portion.

According to the thirteenth aspect of the invention, since the holding means itself holds the drive pin so as to be able to move in the rotation outward direction, the regulating portion is unnecessary.

According to the fourteenth invention, the drive pin is moved to the outer rear side of the rotation by the simple structure of the longitudinal hole.
Therefore, the chucking mechanism can be realized with a very simple structure.

According to the fifteenth invention, since the plate stand is provided on the mounting surface and the drive pin can be moved outward and rearward of the rotation by the plate stand, the chucking mechanism can be realized with an extremely simple structure.

According to the sixteenth invention, since the mounting portion is the rotor yoke itself, the chucking mechanism can be realized only by processing the mounting portion on the rotor yoke as described above.

According to the seventeenth invention, since the drive pin can be attached from one side of the mounting surface, the assembling work becomes very easy.

According to the eighteenth invention, since the drive pin itself is attached so as to be rotatable, it becomes easy to engage with the engaging portion of the medium. In addition, obstacles to pressurization and friction on the drive pin are reduced.

According to the nineteenth invention, since the drive pin has the inclined surface, the medium is not damaged.

According to the twentieth aspect of the invention, since the drive pin is supported on the mounting surface, a special support member for supporting the drive pin is unnecessary.

According to the twenty-first aspect, since the flexible disk is provided with the above-described chucking mechanism,
The flexible disk device itself can be easily manufactured, and a flexible disk device having a small number of parts can be obtained.

[Brief description of drawings]

FIG. 1 is a plan view of a chucking mechanism according to a first embodiment of the present invention.

FIG. 2 is a side view of the first embodiment of the present invention viewed from the E direction.

FIG. 3 is a sectional DD side view of the first embodiment of the present invention.

FIG. 4 is a diagram showing a drive pin and an arm according to the first embodiment of the present invention.

FIG. 5 is a plan view of the rotor yoke according to the first embodiment of the present invention.

FIG. 6 is a plan view of the chucking magnet according to the first embodiment of the present invention.

FIG. 7 is a plan view of a rotor yoke and an arm according to the first embodiment of the present invention.

FIG. 8 is a plan view showing a state in which the drive pin has entered the drive hole in the first embodiment of the present invention.

FIG. 9 is a plan view showing a state in which the drive pin is engaged with the drive hole according to the first embodiment of the present invention.

FIG. 10 is a side view of drive pins and arms according to the second embodiment of the present invention.

FIG. 11 is a side view of the hub mounted on the drive pin according to the second embodiment of the present invention.

FIG. 12 is a diagram showing drive pins and arms according to a third embodiment of the present invention.

FIG. 13 is a diagram showing drive pins and arms according to a third embodiment of the present invention.

FIG. 14 is a diagram showing a drive pin and an arm according to a third embodiment of the present invention.

FIG. 15 is a perspective view showing a chucking mechanism in Embodiment 4 of the present invention.

FIG. 16 is a sectional side view of a drive pin according to a fourth embodiment of the present invention.

FIG. 17 is a plan view of the drive pin according to the fourth embodiment of the present invention.

FIG. 18 is a perspective view showing a chucking mechanism in Embodiment 5 of the present invention.

FIG. 19 is a perspective view of a drive pin according to the fifth embodiment of the present invention.

FIG. 20 is a plan view of a gourd-shaped hole provided on a rotor yoke according to the sixth embodiment of the present invention.

FIG. 21 is a plan view of a rotor yoke according to a fifth embodiment of the present invention.

FIG. 22 is a sectional side view of a drive pin according to a sixth embodiment of the present invention.

FIG. 23 is a side view of the drive pin according to the seventh embodiment of the present invention.

FIG. 24 is a sectional view of a chucking mechanism according to an eighth embodiment of the present invention.

FIG. 25 is an enlarged perspective view of a fixed shaft according to an eighth embodiment of the present invention.

FIG. 26 is a cross-sectional plan view of KK in Embodiment 8 of the present invention.

FIG. 27 is a diagram showing a drive pin in Embodiment 9 of the present invention.

FIG. 28 is a diagram showing a drive pin in Embodiment 10 of the present invention.

FIG. 29 is a diagram showing a drive pin in Embodiment 11 of the present invention.

FIG. 30 is a plan view showing a conventional chucking mechanism.

FIG. 31 is a plan view in which a hub is centered on a conventional chucking mechanism.

[Explanation of symbols]

 4 Drive Motor 5 Rotational Shaft 6 Chucking Surface 7 Drive Pin 8 Control Part 11 Rotor Yoke 12 Arm 13 Chucking Magnet 19 Spring Member 20 Small Hole 22 Shaft 23 Disc 24 Gourd Hole 25 Second Hole 26 First Hole 27 Rectangular hole 28 Fixed shaft 29 Positioning hole 39 Post 41 Longitudinal hole 42 Plate stand

Claims (21)

[Claims] 1. A chucking mechanism for chucking a medium having a bearing and an engaging portion, comprising the following elements: (a) a mounting portion having a mounting surface for mounting a medium, and (b) the mounting surface. Is provided inside and engages with the bearing of the medium,
An axis serving as a center of rotation, (c) a drive pin provided at a position different from the axis in the mounting surface and engaging with an engaging portion of the medium, (d) holding the drive pin on the mounting surface With
Holding means for movably holding the drive pin within a predetermined range within the mounting surface, (e) When the drive pin engages with the engaging portion of the medium, the drive pin is brought into contact with the drive pin so that the drive pin A control part that moves in the outer direction of rotation. 2. The holding means holds an arm to which the drive pin is fixed, an opening partly opening a mounting surface, holds the arm in the opening part, and holds the arm along the surface of the mounting surface. The chucking mechanism according to claim 1, further comprising a support portion that slidably supports the chucking mechanism. 3. The support portion is formed by using a part of a mounting surface that was in the opening portion.
The described chucking mechanism. 4. The chucking mechanism according to claim 2, wherein at least a part of the arm is made of an elastic material. 5. The support portion is provided at a position where the elastic body used for the arm is easily deformed in order to incline the drive pin with respect to the mounting surface. Chucking mechanism. 6. The starter pin has a hollow portion, and the holding means engages with a small hole provided on a mounting surface and a hollow portion of the drive pin to mount the drive pin through the small hole. The chucking mechanism according to claim 1, further comprising a spring member mounted on the surface. 7. The holding means includes a small hole provided on the mounting surface, a mounting piece provided on the back side of the mounting surface, and a connecting portion for connecting the drive pin and the mounting piece via the small hole. The chucking mechanism according to claim 1, wherein: 8. The chucking mechanism according to claim 7, wherein the holding means further includes an opening which is continuous with the small hole and into which the attachment piece is inserted from the front side of the mounting surface. 9. The drive pin has a hollow portion, and the holding means mounts a small hole provided on a mounting surface, a fixed shaft provided in the hollow portion, and the fixed shaft through the small hole. The chucking mechanism according to claim 1, further comprising a fixing member that is fixed to the surface. 10. The chucking mechanism according to claim 1, wherein the drive pin has a hollow portion, and the holding means has a post fixed to a mounting surface and passing through the hollow portion. 11. The chucking mechanism further includes a chucking magnet that covers at least a part of the opening between the mounting surface and the medium.
Alternatively, the chucking mechanism according to item 8. 12. The regulating portion is formed by bending a part of a mounting surface.
The described chucking mechanism. 13. A chucking mechanism for chucking a medium having a bearing and an engaging portion, comprising: (a) a mounting portion having a mounting surface on which a medium is mounted and rotating; (b) the mounting. Is provided in-plane and engages the bearing of the medium,
An axis serving as a center of rotation, (c) a drive pin provided at a position different from the axis in the mounting surface and engaging with an engaging portion of the medium, (d) holding the drive pin on the mounting surface With
Holding means for holding the drive pin movably rearward of the rotation. 14. The holding means has a longitudinal hole provided on the mounting surface toward the outer rear side of the rotation, and an attaching means for attaching the drive pin to the longitudinal hole so as to be movable along the longitudinal hole. The chucking mechanism according to claim 13, wherein: 15. The drive pin has a longitudinal hollow portion, and the holding means extends toward the outer rear side of the rotation on the mounting surface and is provided in the longitudinal hollow portion to mount the drive pin on the mounting surface. A plate stand is attached so as to be movable rearward and outward of rotation with respect to the plate stand.
3. The chucking mechanism described in 3. 16. The chucking mechanism according to claim 1, wherein the mounting portion is a rotor yoke. 17. The holding means mounts the drive pin from one side of a mounting surface.
Alternatively, the chucking mechanism according to item 16. 18. A chucking mechanism including a drive pin that engages with an engaging portion of the medium to drive the medium, wherein the drive pin is rotatably attached. 19. A chucking mechanism provided with a drive pin that engages with an engaging portion of a medium to drive the medium, characterized in that an inclined surface is provided between an upper surface and a side surface of the drive pin. Chucking mechanism. 20. A chucking mechanism having a drive pin for driving a medium by engaging with an engaging portion of the medium, wherein the drive pin is slidably held on a mounting surface on which the medium is mounted. A chucking mechanism. 21. A flexible disk device comprising the chucking mechanism according to claim 1.