JP2913828B2 - Disk chatching mechanism and flexible disk drive device having the same - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a disk chucking mechanism of a flexible disk drive.

[Prior Art] A conventional technique is described in Japanese Utility Model Laid-Open No. 52351/1986,
As shown in FIG. 7, FIG. 8, FIG. 9, and FIG.
A chucking lever 3 is attached to a rotary plate 2 which is attached to a rotary drive shaft 1 which engages with a center hole of the rotary shaft and rotates integrally with the rotary drive shaft. One end of the chucking lever 3 is eccentric from the center of the hub 7. The drive pin 5 which engages with the drive hole 7a provided at the position
2a, and the chucking lever 3 is attached to the chucking lever spring so that the driving pin 5 can move from the outer peripheral side to the inner peripheral side of the rotary plate in the rotation direction of the rotary plate 2. 9 and a spring 8 for urging the drive pin 5 is known. FIG. 7 is a plan view of a conventional disk chucking device, FIG. 8 is a sectional view of a conventional disk chucking mechanism, and FIG. 9 is a rear view of FIG.
In FIGS. 7 and 9, the disk 6 and the hub 7 are indicated by alternate long and short dash lines for easy understanding of the drawings. FIG. 10 is a schematic sectional view of a driving pin portion.

[Problems to be Solved by the Invention] However, in the above-described conventional technology, the number of components is increased when configuring the chucking mechanism, and therefore, the assembling process is not easy. Further, the pressure of the spring 8 for urging the chucking lever 3 at the time of chucking generates a frictional force at the rotation fulcrum of the chucking lever 3. The spring pressure had to be kept within a certain standard, and the spring pressure had to be adjusted.

Therefore, an object of the present invention is to eliminate such a problem of the prior art, simplify the chucking mechanism, adjust the spring pressure of the chucking mechanism without adjustment, and facilitate the assembly process.

Means for Solving the Problems In order to solve the above problems, a disk chucking mechanism according to the present invention relates to a center hole of a metal hub fixed to a center portion of a disk housed in a case. A driving pin for chucking that protrudes into and engages with a driving hole provided at a position eccentric from the center of the hub, wherein the driving pin is movable by a predetermined amount in the rotation direction of the rotation driving shaft. And a first restricting means and a second restricting means for restricting the movement of the drive pin in the axial direction of the rotary drive shaft, wherein the first restricting means, when mounting the disk on the rotary drive shaft, In the state where the drive pin does not engage in the drive hole,
The second restricting means restricts the movement of the drive pin in the pressing direction by the hub so that the hub rotates in an inclined state. It is characterized in that movement is restricted.

In this case, the drive pin is formed at one end of a chucking lever that is rotatably mounted by a rotation fulcrum structure on a rotating plate fixed to the rotation drive shaft,
Preferably, the first restricting means includes a chucking lever and a rotating plate, and the second restricting means includes a protruding portion formed on the drive pin and a rotating plate.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic plan view of a spindle motor and a disk chucking mechanism according to the present invention.
FIG. 6 is a plan view in which a hub is mounted on the disk chucking mechanism of FIG. In FIG. 1, a diagonally shaded portion of the chucking magnet 131b is magnetized. The hub 7 is shaped so that the suction force of the hub 7 is uniform with respect to the center of the rotation drive shaft 133. The chucking lever 135 is rotatably fixed on the rotor 131 by a chucking lever pin 141. The driving pin 142 is fixed to the chucking bar 135. The chucking lever 135 is arranged in a hole provided in the chucking magnet 131b,
A part of the hole has a hole 131b in the rotor 131 as well.
FIGS. 2, 3, and 4 are cross-sectional views of the disk chucking mechanism, showing a case where a hub 7 attached to a disk is mounted from the top in the figure. As shown in FIG.
The chucking magnet 131b on the slide sheet 137
Is adsorbed. At this time, the probability that the positional relationship between the drive hole 7a provided in the hub 7 and the drive pin 142 matches is small. The drive pin 142 is pushed by the hub 7 but the chucking lever 135
Is provided on the rotor 131, the drive pin 142 does not move in the direction 144a shown in FIG.
Incline. Then, with the hub 7 inclined,
The rotor 131 rotates according to the motor rotation signal. As a result, the drive hole 7a of the hub 7 and the drive pin 142 coincide with each other, the hub is flattened, and the drive pin 142 projects into the drive hole 7a as shown in FIGS. Further, as shown in FIG. 6, when the drive pin 142 and the two surfaces 7a1 and 7a2 of the drive hole 7a are engaged, the chucking lever 135 is rotated in the direction of arrow 143 in FIG. 7 center hole 7b
The two surfaces 7b1 and 7b2 are pressed against the rotary drive shaft 133 to center the hub 7.

Further, when the hub 7 is driven by the drive pin 142 in FIG. 4, a force is applied in the direction of arrow 150 in the figure. With this force, the drive pin 142 tries to move in the direction of the arrow 151 in the drawing with the chucking lever 135. At this time, the drive pin 142 is formed with a floating prevention convex portion 142a that engages with the rotor 131, and prevents the drive pin 142 from moving in the direction of arrow 151 in the figure. If there is no floating prevention convex portion 142a, the drive pin 142 moves as indicated by a dashed line 142b in the figure, and the drive position of the hub 7 changes by 152. This leads to misalignment in the rotational direction among the important characteristics required for the chucking mechanism of the flexible disk drive, which has a significant effect on the compatibility of the flexible disk drive. Further, since the drive pin 142 is lifted, the hub 7 is also lifted at the same time, and the hub 7 to be attracted and stabilized on the slide sheet 137 is in a single floating state, and the contact between the disk 6 and the head (not shown) is unstable. And adversely affect signal recording and reproduction. In order to ensure that the drive hole 7a and the drive pin 142 are engaged,
The inner wall 1 of the hole 131d provided in the rotor 131 as shown in FIG.
The operating range of the chucking lever 135 is regulated by 31d1 and 131d2.

Conventionally, the method of urging the chucking lever with a spring,
Accuracy of the spring pressure was required so that the spring pressure was always within the standard. However, in this embodiment, the spring is not used, and the chucking mechanism is constituted only by the driving pin and the chucking lever. Therefore, the spring does not need to be adjusted. At the same time, by reducing the number of parts, simplification in the assembly process can be achieved. In addition, the portion of the hub in contact with the drive pin is made of plastic resin, so that the hub is hardly damaged, the torque crossing caused by sliding of the hub and the drive pin when the motor starts rotating is small, and there is no need to damage the hub surface. Further, the chucking lever and the drive pin are integrated, for example, plastic resin or metal is used to reduce the number of components, thereby simplifying the assembly process.

[Effect of the Invention] As described above, the disk chucking mechanism of the present invention has a structure in which the drive pin is fixed to the tip of the chucking lever and does not move in the vertical direction due to engagement with the rotating plate. Reduced number of parts for chucking mechanism,
There are advantages such as simplification of the assembling process and non-adjustment of the spring, and furthermore, it leads to cost reduction and has a great effect of eliminating unstable factors such as adjustment and improving reliability.

[Brief description of the drawings]

FIGS. 1, 5, and 6 are schematic plan views of a spindle motor and a disc chucking mechanism according to the present invention, and FIGS. 2, 3, and 4 are cross-sectional views of the disc chucking mechanism according to the present invention. FIG. 7 is a plan view of a conventional disk drive, FIG. 8 is a cross-sectional view of the conventional disk drive, and FIG. 9 is a rear view of FIG. FIG. 10 is a schematic sectional view of a driving pin portion. 142 …… Drive pin 142a …… Drive pin floating prevention projection 135 …… Chucking lever

Claims (3)

(57) [Claims] A rotary drive shaft engaged with a center hole of a metal hub fixed to a center of a disk housed in a case; and a drive hole provided at a position eccentric from the center of the hub. A driving pin for chucking which protrudes and engages, wherein the driving pin is configured to be movable by a predetermined amount in a rotation direction of the rotary drive shaft, A first regulating unit that regulates movement, and a second regulating unit, wherein the first regulating unit is configured such that when the disc is mounted on the rotary drive shaft, the drive pin does not engage in the drive hole. The second restricting means restricts the movement of the drive pin in the pressing direction by the hub so that the hub rotates in an inclined state, wherein the drive pin is engaged in the drive hole. Drive pin float Disk chucking mechanism, characterized in that for regulating the movement in the direction. 2. The drive pin is formed at one end of a chucking lever rotatably mounted on a rotary plate fixed to the rotary drive shaft by a rotary fulcrum structure. 2. The control device according to claim 1, wherein the first control unit includes the chucking lever and the rotary plate, and the second control unit includes a protrusion formed on the drive pin and the rotary plate. 3. Disc chucking mechanism. 3. A flexible disk drive device comprising the disk chucking mechanism according to claim 1.