JPH05342729A - Disk turning and driving apparatus - Google Patents

Abstract

PURPOSE:To obtain a disk turning and driving apparatus of which constituent components are small, constitution and assembly are simple, productivity is high, driving pin action in a chucking operation is a two-dimensional action and positioning force can be controlled easily. CONSTITUTION:The apparatus is provided with the following: a rotor case for a motor; an attractive magnet by means of which a disk arranged and installed on the rotor case is attracted to a hub stand; and a driving pin which is coupled with a chucking hole in a disk hub protruding from the rotor case. A plate 11 which supports the driving pin 16 is held by the rotor case which can be moved freely within a limited range inside its plane. A plate spring part 12 is installed integrally at the plate 11; the plate spring part 12 is pressed to a pressure piece 21; the plate 11 is energized in the direction in which a positioning force is generated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk rotation drive device, and more particularly to a disk chucking mechanism therefor.

[0002]

2. Description of the Related Art For example, a 3.5-inch type floppy disk rotary drive device has a disk chucking mechanism of a type in which a drive pin is engaged with a chucking hole of a disk hub to rotationally drive a disk. There is. In this type of disk rotation drive, the spindle is fitted in the hole at the center of the disk hub, and the drive pin is pressed against the square even part of the window hole formed at a position displaced from the center of the disk hub to position the positioning force. Is generated and the disc hub is positioned with respect to the hub base. A conventional example of such a disk rotation driving device is shown in FIGS.

In FIGS. 7 and 8 showing an example of a conventional disk rotation driving device, a center pin 55 is located on the lower surface side of a rotor case 53 of a disk driving motor, and a substantially central portion of a sickle-shaped lever 54 in the length direction. Installed by. The lever 54 can rotate about the center pin 55 in a plane parallel to the plane of the rotor case 53. A drive pin 56 is attached to one end of the lever 54.
A tension spring 57 is hooked between the other end of the lever 54 and the rotor case 53 so that the lever 54 moves toward the center pin 5.
5 in the clockwise direction in FIG.
6 is rotationally urged in a direction of moving to the outside of the rotor case 53.

As is well known, a hub base is integrally provided on the upper side of the rotor case 53, and the hub 50 of the information recording disk is mounted on the hub base. A suction magnet for attracting the disk hub 50 and adhering it to the hub base is provided around the hub base. A spindle 58 projects upward from the center of the hub base, and the spindle 58 has a square-shaped hole 5 provided substantially at the center of the disk hub 50.
1 fits. The disk hub 50 is also provided with a rectangular chucking hole 52 at a position offset from the center,
The drive pin 56 is fitted into the chucking hole 52.
Since the lever 54 is biased by the spring 57 so that the drive pin 56 moves to the outside of the rotor case 53 as described above and a positioning force is generated, the lever 54 rotates in a predetermined direction together with the rotor case 53. Then drive pin 5
6 engages with the outer corner even portion of the chucking hole 52 in the front of the rotation direction, while the spindle 58 engages with the corner even portion of the hole 51 of the disc hub 50, so that the disc hub 50 is mounted on the hub base. It is rotationally driven in the positioned state.

FIGS. 9 and 10 show another example of a conventional disk rotation drive device, and FIG. 9 shows a leaf spring 60 which supports a drive pin 64. The leaf spring 60 has a center hole 61 into which the spindle is fitted, and two welded portions 62, 62 to the rotor case 65. The periphery of the center hole 61 and the portions other than the welded portions 62, 62 act as springs. Particularly, the connecting portion between the mounting portion 63 of the drive pin 64 and the main body portion of the leaf spring 60 is formed in a folded shape, and when the drive pin 64 is pressed from above, the connecting portion bends and the drive pin 64 is bent. Is designed to go down. Therefore, when the disc is placed on the hub base, the chucking hole 52 of the disc hub 50 is
When the position of does not match the position of the drive pin 64, the drive pin 64 is pushed by the disc hub 50 and moves down,
When the drive pin 64 rotates together with the rotor case 65, the hub base and the leaf spring 60 to match the chucking hole 52,
The drive pin 64 is raised by the restoring force of the leaf spring 60, and the drive pin 64 engages with the corner part of the chucking hole 52 of the disk hub 50 to generate a positioning force.

[0006]

According to the conventional example shown in FIGS. 7 and 8, the disk chucking mechanism includes the lever 5
4, the center pin 55, the spring 57, and the drive pin 56 are composed of four parts, so that there are many constituent parts and the structure is complicated, and there is a risk that the spring 57 will come off due to vibration or the like. If there is a dimensional error in the disk hub 50, the rotation position of the lever 54 in the chucking state is different, and the position of the drive pin 56 in the disk hub rotation direction is displaced accordingly, and the disk is chucked to the hub base. There is a drawback that the position shift occurs.

Further, according to the conventional example shown in FIGS. 9 and 10, the chucking mechanism is composed of one leaf spring 60 and the drive pin 64, which is advantageous in that the number of components is small. Since 60 is displaced by a three-dimensional operation, the operation of the drive pin 64 is complicated, and the leaf spring 6
Since 0 easily deforms, it is difficult to control the positioning force.

The present invention has been made to solve the above-mentioned conventional problems. It has a small number of constituent parts, is simple in construction and assembly, and has high productivity, and the operation of the drive pin during chucking is two. An object of the present invention is to provide a disk rotation drive device in which the positioning force can be easily controlled by three-dimensional operation.

[0009]

In order to achieve the above object, the present invention provides a rotor case for a disk drive motor,
A drive pin for a disk rotation drive device, which is provided in the rotor case and has a suction magnet for attracting the disk hub to the hub base, and a drive pin protruding from the rotor case and engaged with a chucking hole of the disk hub. It is characterized in that the plate for supporting is held by the rotor case so as to be freely movable within a limited range within the plane. A plate spring portion may be integrally provided on the plate, and the plate spring portion may be pressed against the pressing piece to urge the plate in the direction in which the positioning force is generated. The plate has claws,
You may make it contact | abut this claw part with a part of hub stand, and may restrict | limit the position in the position force generating direction.

[0010]

When the disc is set at a predetermined position, the attraction magnet attracts the disc hub and attracts it to the hub base.
At this time, even if the chucking hole of the disk hub and the drive pin do not match, the chucking hole of the disk hub and the drive pin match during one rotation of the hub base together with the rotor case, and the drive pin fits into the chucking hole. Maru When the leaf spring portion provided integrally with the plate is brought into contact with the pressing piece, the leaf spring portion is urged so that the entire plate moves two-dimensionally in an attempt to return to the original position, and this urging force is used as the positioning force. And position the disk hub on the hub base. When the claw portion provided integrally with the plate is brought into contact with a part of the hub base, excessive movement of the plate in the direction in which the positioning force is generated is prevented, and the drive pin is not caught by the stopper.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a disk rotation drive device according to the present invention will be described below with reference to FIGS. First, the overall configuration will be schematically described with reference to FIG. In FIG. 4, a hole is provided in the central portion of the motor substrate 30, and a bearing housing 31 is fixed to the hole by caulking or the like. The stator core 3 is formed on the substrate 30 so as to surround the bearing housing 31.
6 is fixed. The stator core 36 has a plurality of salient poles radially, and a drive coil (not shown) is wound around each salient pole. A bearing 32 is fitted on the inner circumferential side of the bearing housing 31, and the spindle 32 is fitted by the bearing 32.
3 is rotatably supported. At the upper end of the spindle 33 protruding from the upper end of the bearing 32, a disk-shaped hub base 34 is provided.
Is press-fitted and integrated. The hub base 34 has a fitting portion 39 formed on the lower surface side along a circle concentric with the spindle 33 and formed into a jet case, and the rotor case 20 is fitted and fixed to the outer peripheral side of the fitting portion 39. Has been done. A ring-shaped drive magnet is fixed to the inner surface of the outer peripheral wall (not shown) of the rotor case 20, and the drive magnet faces the salient poles. The stator core 36, the rotor case 20 and the like constitute a disk drive motor.

The rotor case 20 is formed in a flat cup shape, and an attracting magnet 35 is fixed to the upper surface of the rotor case 20 so as to surround the hub base 34. The upper surface of the attraction magnet 35 is slightly lower than the upper surface of the hub base 34. On the lower surface side of the rotor case 20, a thin plate 11 is held so as to be freely movable within a limited range within a plane parallel to the surface of the rotor case 20. The plate 11 supports the drive pin 16, and the drive pin 16 penetrates the hole 23 formed in the rotor case 20 with a spatial margin and projects from the upper surface of the hub base 34.

As shown in FIG. 5, the rotor case 20 has the hole 23, and the pressing piece 21 is formed by cutting and raising a part of the opposite side of the hole 23 across the center hole. On the line orthogonal to the line connecting the center of the hole 23 and the pressing piece 21, a part of the positions facing each other across the center hole of the rotor case 20 is cut and raised downward and bent to form the plate. 11 receiving portions 22,
22 is formed. Reference numerals 22a and 22a are attached to the cut-and-raised portions of the base portions of the receiving portions 22 and 22.
The plate 11 is also formed with a square hole 29 adjacent to one receiving portion 22. The hole 23 has a substantially square shape, and a stopper 24 is formed on the outer side of the hole 23 by cutting and raising, and further, a stopper 25 is formed at the rear edge of the hole 23 in the rotation direction of the two edges of the rotor case 20 in the rotation direction.
Are formed.

As shown in FIG. 1, the plate 11 is formed of a thin plate in a substantially ring shape, and a plate spring portion 12 is formed by bending a part of the ring at a right angle. The drive pin 16 is provided on the opposite side of the leaf spring portion 12.
Is supported. The drive pin 16 may be made of a sintered material, may be cut stainless steel, or may be a ball bearing. Plate 11
A rectangular window hole 15 is formed in the plate 11 and the plate 11
Round holes 13, 13 and round holes 14, 14 are formed at symmetrical positions with respect to the center point O of the. Center point O and each round hole 1
The plate 11 is placed on the line 27, 27 connecting the centers of 3, 13
There is a fulcrum of bending. The elastic modulus of the plate can be adjusted by setting the sizes of the round holes 13 and 14.

The drive pin 16 is fitted in the hole 23 of the rotor case 20 with a spatial margin as described above. Further, a part of the outer periphery of the plate 11 is received by the receiving portions 22, 22 of the rotor case 20 and held in parallel with the rotor case 20. There is a spatial margin between the cut-and-raised parts 22a, 22a at the bases of the receiving parts 22, 22 and the outer periphery of the plate 11. Therefore, the plate 11 can freely move in parallel and rotationally in a plane parallel to the surface of the rotor case 20 only within the range of these spatial allowances and the spatial allowance of the drive pin 16 and the hole 23. The plate 11 is slightly bent along a line 28 connecting the centers of the round holes 14, 14 so that the drive pin 16 can reliably project from the upper surface of the hub base 34.

As shown in FIG. 3, the outer surface of the plate spring portion 12 of the plate 11 is pressed against the pressing piece 21 formed on the rotor case 20. As a result, the plate 11 is stored with energy, and the drive pin 1 is stored with this stored force.
1, a force for moving the drive pin 16 toward the outside is generated in the X direction in FIG. 1, that is, along the line connecting the pressing piece 21 and the center of the drive pin 16. This force becomes the positioning force of the disc hub. As shown in FIGS. 1 and 4, the square hole 2 of the rotor case 20 is formed.
An index magnet 37 is fixed to the lower surface of the attraction magnet 35 through 9. The index magnet 37 penetrates the rectangular hole 15 of the plate 11 with a spatial margin, and faces the sensor 38 which is fixed on the substrate 30 and includes a Hall element or the like. Sensor 3
8 senses the magnetism of the index magnet 37 and outputs an index signal each time the rotor case 20 makes one revolution.

Next, the operation of the above embodiment will be described. When the information recording disc is not loaded, the plate spring 12 of the plate 11 is pressed against the pressing piece 21 and is urged, and the movement by the urging force is restricted at the position where the drive pin 16 contacts the stopper 24. ing. When the disc is loaded in a predetermined position, the hole 51 at the center of the disc hub 50 as described with reference to FIG. 7 fits into the spindle 33, and the disc hub 50 is placed on the hub base 34 and attracted by the attraction magnet 35. Then, it is adsorbed to the hub base 34. At this time, the chucking hole 52 of the disc hub 50
If the position does not match the position of the drive pin 16, the drive pin 16 is pushed down by the disk hub 50 while bending and urging the plate 11 as shown by the chain line in FIG. In this state, when the rotor case 20 and the hub base 34 are rotationally driven by the drive of the disk drive motor, the drive pin 1
6 is pushed by the stopper 25 of the rotor case 20, the drive pin 16 rotates while sliding on the lower surface of the disk hub 50, and the plate 11 together with the drive pin 16 is rotated.
Also rotates, and the drive pin 16 reaches the position of the chucking hole 52 during one rotation.

As described above, the drive pin 16 is attached to the plate 11
Even if the chucking hole 52 is in contact with the stopper 24 by the urging force of the drive pin 16, the chucking hole 52 is rectangular and the rotation path of the drive pin 16 is provided so as to cross the chucking hole 52. When the position of 52 is reached, the drive pin 16 is fitted into the chucking hole 52 by the urging force of the plate 11. The center position of the drive pin 16 at this time is shown by O ₁ in FIG. As the drive pin 16 further rotates together with the rotor case 20, the drive pin 16 moves along the outer edge of the chucking hole 52 to move to the inner diameter side of the rotor case 20 as shown by the chain line in FIG. .. Although the plate 11 also moves with the movement of the drive pin 16, the plate spring portion 12 of the plate 11 is pressed against the pressing portion 21, so that the plate spring portion 12 is formed as shown in FIG.
Is elastically displaced and biased as indicated by the chain line. This urging force generates a positioning force for moving the drive pin 16 in the X direction in FIG.

Due to the positioning force and the rotational force of the drive pin 16, the drive pin 16 is moved to the chucking hole 52.
Of the disk hub is positioned on the hub base 34 while engaging with the corner even portion formed by the outer edge and the front edge in the rotation direction, and the spindle 33 is engaged with the corner even portion of the hole at the center of the disc hub. To be done. The center position of the drive pin 16 at this time is shown in FIG.
Is indicated by O ₂ . Thus, the disc is rotationally driven with the disc hub positioned, an information signal is recorded on the disc, and the recording signal is read. The center position O ₁ and the center position O _{2 of the} drive pin 16
The leaf spring 12 is biased by the amount of the difference from the biasing force, and this biasing force acts as a positioning force. In the state where the disk hub is positioned on the hub base 34 in this way, the drive pin 16 is displaced toward the arrow Y direction shown in FIG. 1, that is, the rear side in the rotation direction by the reaction force of contact with the edge of the chucking hole 52. As shown in FIG. 2, the drive pin 16 contacts a stopper 25 provided on the rotor case 20, and keeps this state to rotate the disk.

According to the embodiment described above, the drive pin 1
Since the plate 11 supporting 6 is held by the rotor case 20 so as to be freely movable within a limited range within the plane, the chucking mechanism is composed of only the plate 11 and the drive pin 16, and the number of parts is small. At a minimum, the plate 11 is held by the receiving portions 22 and 22 formed in the rotor case 20, and the plate spring portion 12 of the plate 11 is pressed against the pressing piece 21, so that the configuration and assembly are simple and the production is easy. Since the operation of the drive pin during chucking is a two-dimensional operation, it is easy to manage the positioning force. Further, since the plate spring portion 12 of the plate 11 itself is pressed against the pressing piece 21 to urge the plate 11 to generate the positioning force, it is not necessary to prepare the urging means as a separate component. Therefore, the problem that the urging means is dropped does not occur. The plate 11 can be manufactured by pressing, which also improves productivity. Since the plate 11 can be easily attached and detached as needed,
Convenient for assembly and adjustment.

FIG. 6 shows a modification of the plate applicable to the present invention. However, since the plate 11 in the above-mentioned embodiment is used as a basis and a configuration is added to this, the same reference numerals are given to the same components, and the added components will be mainly described. In FIG. 6, the plate 1
A pair of claws 41 and 42 are formed on the base plate 1 inwardly in the radial direction near the base of the plate spring portion 12. Nail 4
Reference numerals 1 and 42 contact the outer peripheral surface of the fitting portion 39 of the hub base 34 that fits with the rotor case, so that the movement of the positioning force in the direction of generation of the positioning force, that is, to the right in FIG. 6, is restricted. When the claws 41, 42 are in contact with the fitting portion 39, a slight gap is formed between the drive pin 16 and the outer peripheral stopper 24.

Using the plate 11 shown in FIG.
Since the positions of the plates 11 and 42 contact the fitting portion 39 and the position of the plate 11 in the direction of the positioning force generated by the drive pin 16 is regulated, a slight gap is generated between the drive pin 16 and the stopper 24 on the outer peripheral side. When the position of the chucking hole 52 of the disc hub and the drive pin 16 do not match, the drive pin 16 is pushed down by the disc hub and the plate 11
Even if the drive pin 16 bends and the drive pin 16 tilts in the outer peripheral direction, the drive pin 16 does not hit the stopper 24 strongly, and therefore,
The drive pin 16 and the stopper 24 are not strongly rubbed with each other, and the stopper 24 does not hinder the return of the drive pin 16.

[0023]

According to the first aspect of the present invention, the plate supporting the drive pin is held by the rotor case so as to be freely movable within a limited range within the plane of the plate. Has the advantage that the number of parts is reduced with only the plate and the drive pin, and since the movement of the drive pin during chucking is a two-dimensional movement, it has the advantage that the positioning force can be easily managed.

According to the second aspect of the present invention, the plate is held by the receiving portion formed in the rotor case, and the plate spring portion of the plate is pressed against the pressing piece 21 to urge the plate and thereby the positioning force is exerted. Since it is designed to be generated, the structure and assembly are simple and the productivity is high. Moreover, it is not necessary to prepare the biasing means of the plate as a separate component, and there is no problem that the biasing means falls off. ..

According to the third aspect of the present invention, the claw portion of the plate is brought into contact with a part of the hub base to regulate the position of the plate in the direction of generating the positioning force. When the positions of the drive pins do not match, even if the drive pins are pushed down by the disk hub and tilted, the drive pins do not hit the stopper or the like strongly and the recovery of the drive pins is not hindered.

[Brief description of drawings]

FIG. 1 is a plan view showing an example of a plate applicable to the present invention and an example of a part of a rotor case.

FIG. 2 is a side view of the example of FIG. 1 viewed from the direction of arrow A.

FIG. 3 is a side view of the example of FIG. 1 viewed from a direction of an arrow B.

FIG. 4 is a front sectional view showing an embodiment of a disk rotation drive device according to the present invention.

FIG. 5 is a plan view of a rotor case in the embodiment.

FIG. 6 is a plan view showing another example of a plate applicable to the present invention.

FIG. 7 is a bottom view showing an example of a chucking mechanism in a conventional disc rotation drive device.

FIG. 8 is a front sectional view of the above chucking mechanism.

FIG. 9 is a bottom view showing another example of the chucking mechanism in the conventional disk rotation drive device.

FIG. 10 is a front sectional view of the chucking mechanism of the above.

[Explanation of symbols]

 11 plate 12 leaf spring part 16 drive pin 20 rotor case 21 pressing piece 34 hub stand 35 suction magnet 41 claw part 42 claw part

Claims (3)

[Claims] 1. A rotor case of a disk drive motor for rotatably driving an information recording disk, an attracting magnet arranged in the rotor case for attracting a hub of the disk to a hub base, and the rotor case. In a disk rotation drive device having a drive pin that projects and engages with a chucking hole formed in the hub of the disk, a plate that supports the drive pin is freely movable within a limited range in its plane. A disk rotation drive device, which is movably held by the rotor case. 2. The disk rotation drive device according to claim 1, wherein the plate integrally has a leaf spring portion, and the leaf spring portion is pressed against the pressing piece to urge the plate in a direction for generating a positioning force. 3. The disk rotation drive device according to claim 2, wherein the plate has a claw portion, and the claw portion abuts a part of the hub base to regulate the position in the direction of the positioning force generation.