Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Disk record
Reexamination Certificate
2002-08-21
2004-08-10
Heinz, A. J. (Department: 2653)
Dynamic magnetic information storage or retrieval
Record transport with head stationary during transducing
Disk record
Reexamination Certificate
active
06775096
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a chucking device for a magnetic disk.
2. Description of the Related Art
A magnetic disk typified by a flexible disk is loaded, in the form of a disk cartridge in which a thin film recording disk is received in a case into a magnetic disk drive device. The recording disk is rotated in this magnetic disk drive device, and input/output of recording is carried out through a writing/reading window with a shutter, which is bored in the case. This recording disk must be easily attached/detached while it is received in the case. Further, it must be accurately aligned with a rotating shaft of the magnetic disk drive device at writing/reading, and the rotating speed must be accurately controlled. Thus, conventionally, a chucking device shown in FIG.
7
and
FIG. 8
is used in the magnetic disk drive device.
A center hub made of a ferromagnetic metal disk or the like is fitted to the center part of the recording disk of the flexible disk. In
FIGS. 7 and 8
, this center hub
2
is provided with a substantially square center hole
3
at its center part, and a substantially rectangular drive hole
4
at its peripheral part. This drive hole
4
includes a front edge
4
a
at the front in a rotor yoke rotation direction and an outside edge
4
b
in a direction (hereinafter referred to as “outward” in the present specification) away from the rotation center of the rotor yoke.
On the other hand, the magnetic disk drive device is provided with a rotor yoke
101
made of a ferromagnetic metal disk and rotationally driven by a motor (not shown) in a constant direction (denoted by “D” in the drawing), and a magnetic disk (chucking magnet)
102
is fixed thereon.
A center shaft
103
is provided in a standing manner at the rotation center O of the rotor yoke
101
. This center shaft
103
extends through an opening
102
a
of the center part of the magnetic disk
102
and is loosely inserted into the center hole
3
of the center hub.
In the present specification, “loosely” means a state in which a free movement can be made within a predetermined range in the horizontal direction and the vertical direction.
A drive pin through hole
104
is formed into an arc shape along a circumference at a peripheral part of the rotor yoke
101
. A chucking arm
105
molded into an arc shape along the circumference is fitted in the drive pin through hole
104
. The chucking arm
105
is provided with a drive pin
106
extending upward at a tip part (hereinafter referred to as “front part”)
105
a
directed toward a rotation direction D of the rotor yoke
101
. This drive pin
106
loosely passes through a front opening
102
b
formed in the magnetic disk
102
and is loosely inserted into the drive hole
4
of the center hub.
On the other hand, a fixing hole
105
c
is provided at the other end (hereinafter referred to as “rear part”)
105
b
of the chucking arm
105
. Further, a hole part
101
a
corresponding to the fixing hole
105
c
is also provided in the rotor yoke
101
and the magnetic disk
102
. A fixing pin
101
b
passing through the fixing hole
105
c
and the hole part
101
a
locks the chucking arm
105
to the rotor yoke
101
. The chucking arm
105
can swing with this fixing pin
101
b
as the center in the horizontal direction within the range of the width of the drive pin through hole
104
.
When the flexible disk is loaded in this magnetic disk drive device, the recording disk is placed on the rotor yoke
101
. The center hub
2
fitted to the recording disk is magnetically attracted by the magnetic disk
102
, and the center hole
3
of the center hub receives the center shaft
103
at the side of the rotor yoke. At this point, the drive pin
106
projecting upward from the magnetic disk
102
may or may not be inserted in the drive hole
4
of the center hub. In case the magnetic disk
102
is not inserted, the center hub
2
presses the drive pin
106
, which is pushed to the level of the lower surface of the center hub
2
.
Here, when a motor (not shown) makes at most one turn to the rotor yoke
101
in the D direction, the top of the drive pin
106
slides and rotates on the lower surface of the center hub, and is received into the drive hole
4
and raised. When the rotor yoke
101
is further rotated in the D direction in this state, the chucking arm
105
is swung in the direction in which the drive pin
106
comes away from the rotation center O by the centrifugal force due to rotation of the rotor yoke
101
. The drive pin
106
then comes in contact with the outside edge
4
b
of the drive hole
4
and swings and moves forward in the drive hole
4
through the rotating force of the rotor yoke
101
. The drive pin
106
comes in contact with the front edge
4
a
of the drive hole
4
as well. As a result, the drive pin
106
comes in contact with two sides of the front edge
4
a
and the outside edge
4
b
of the drive hole
4
and is supported. This state is hereinafter referred to as “front/outside support”.
At this time, the center shaft
103
comes in contact with two adjacent sides
3
a
and
3
b
of the center hole
3
of the center hub at the side facing the drive pin
106
across the rotation center O. In this state, the center of the recording disk coincides with the rotating shaft O of the rotor yoke
101
and chucking is completed. In this state, the recording disk of the flexible disk is not decentered and can accurately follow the controlled rotation speed of the rotor yoke
101
to rotate.
However, in the conventional chucking apparatus, the fixing pin
101
b
is used for the swing of the chucking arm
105
to realize the front/outside support of the drive pin
106
, which increases the number of parts. Further, in order to manufacture this chucking apparatus, positioning and boring of the fixing hole
105
c
and the hole part
101
a
, caulking fixation of the fixing pin
101
b
and the like become necessary. These make manufacture and assembly troublesome and the manufacturing cost high.
SUMMARY OF THE INVENTION
The present invention provides a chucking device for a magnetic disk, which realizes a front/outside support by inexpensive means, prevents decentering rotation of a recording disk, and always enables accurate writing/reading.
To achieve the above object, the present invention adopts the following structure.
A chucking device for a magnetic disk of the invention comprises a substantially disk-shaped bearing provided on a surface of a base body and having an outer peripheral side surface, a rotor yoke disposed on the bearing and rotating in a constant direction while having a center hub of a magnetic disk placed thereon, a center shaft provided from the bearing to pass through a rotation center of the rotor yoke and loosely inserted into a center hole of the center hub, and a drive arm extending in a circumferential direction in a rear side of the rotor yoke and loosely suspended from and held by the rotor yoke at both ends thereof. The chucking device is characterized in that an inner peripheral surface for restraining the drive arm moving toward the bearing is formed along an outer peripheral side surface of the bearing at an inner peripheral side of the drive arm. A drive pin is formed at a front part of the drive arm in a rotor yoke rotation direction, which loosely passes through a drive pin through hole formed in the rotor yoke and extends toward a surface side of the rotor yoke, and is loosely inserted into a drive hole formed at a peripheral part of the center hub and having a front edge at a front part in the rotor yoke rotation direction and an outside edge in a direction away from a rotation center of the rotor yoke. A rear edge part of the drive pin through hole is enabled to come in contact with the drive pin. A locking flange for loosely locking the drive pin is provided at an outer edge part thereof. When the rotor yoke having the magnetic disk placed thereon is rotated, the inner peripheral surface of the drive arm comes away from the outer peripheral side
Alps Electric Co. ,Ltd.
Brinks Hofer Gilson & Lione
Castro Angel
Heinz A. J.
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