Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Disk record
Reexamination Certificate
1998-10-14
2001-02-06
Davis, David (Department: 2754)
Dynamic magnetic information storage or retrieval
Record transport with head stationary during transducing
Disk record
C369S077210
Reexamination Certificate
active
06185066
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a magnetic disk drive for recording and reproducing information on a flexible disk housed in a case of a magnetic disk. More specifically, the present invention relates to an improvement of impact measures therefor.
Magnetic disk drives of the type described is some type of a device on which a magnetic disk can be mounted and held by a magnetic disk table for the purpose of recording and reproducing information. The magnetic disk table is for rotation driving the magnetic disk while holding it. A magnetic head is used to record and reproduce information on the magnetic disk. The magnetic disk drives also include a magnetic disk mounting and ejection assembly for use in ejecting a magnetic disk out of the magnetic disk drive after recording or reproduction of information.
FIG. 1
is an exploded perspective view of a typical magnetic disk drive in particular with a magnetic disk mounting and ejection assembly being illustrated separately. In
FIG. 1
, the magnetic disk drive comprises a chassis
11
formed by pressing a sheet metal, an eject plate
12
, and a disk holder
13
.
The chassis
11
has a main base section
11
-
1
, opposing side walls
11
-
2
and
11
-
3
, a back end wall
11
-
4
, two support claws
11
-
5
and different two support claws
11
-
6
. The side walls
11
-
2
and
11
-
3
extend upward at right angles from both side edges of the plate-like main base section
11
-
1
. Likewise, the back end wall
11
-
4
extends upward at right angles from the rear edge of the main base section
11
-
1
. Each of the support claws
11
-
5
and
11
-
6
is formed by means of cutting and raising a portion of the main base section
11
-
1
. The support claws
11
-
5
and
11
-
6
have shoulder portions
11
-
5
a
and
11
-
6
a
, respectively. Each of the shoulder portions
11
-
5
a
and
11
-
6
a
is a notch formed in the respective support claws.
A magnetic disk table
14
and a carriage mechanism
15
are mounted on the main base section
11
-
1
in the direction along the side walls of the chassis
11
. The magnetic disk table
14
is for rotation driving a magnetic disk while holding it. The carriage mechanism
15
is for use in driving a pair of magnetic heads in the direction of a track in the magnetic disk. More specifically, an upper magnetic head and a lower magnetic head are driven in the track direction on a top surface and a back (under) surface, respectively, of the magnetic disk. A stepping motor
16
is mounted on the back end wall
11
-
4
of the chassis
11
. The stepping motor
16
has a rotation shaft
16
-
1
with a helical thread therein and is arranged so that the rotation shaft
16
-
1
extends in the direction along the side walls of the chassis
11
. The magnetic disk table
14
is directly connected to and rotation driven by a rotor assembly of a magnetic disk driving motor disposed beneath the chassis
11
.
The carriage mechanism
15
has a carriage base body at a rear portion thereof, as described more in detail below. The carriage mechanism
15
is slidably supported by a guide shaft
15
-
2
that is fixed to the main base section
11
-
1
at the carriage base body. A carriage arm
15
-
1
is provided on the carriage base body. The carriage arm
15
-
1
has a pin at the tip thereof. The pin engages with the helical thread formed in the rotation shaft
16
-
1
. In response to rotation of the stepping motor
16
, the carriage arm
15
-
1
cooperates with the rotation of the stepping motor
16
and reciprocates back and forth. This moves the carriage arm
15
-
1
linearly in the direction along the side walls of the chassis
11
, that is, in the radial direction of the magnetic disk. The carriage mechanism
15
has a lower carriage
15
-
4
and an upper carriage
15
-
5
. The lower carriage
15
-
4
carries a magnetic head
15
-
3
for the back surface of the magnetic disk. The upper carriage
15
-
5
carries a magnetic head (not shown) for the top surface of the magnetic disk. The upper carriage
15
-
5
is rotatable about the edge of the carriage base body. The upper carriage
15
-
1
rotates upward when a magnetic disk is inserted into the carriage mechanism
15
and then rotates downward when the magnetic disk is completely mounted in the disk drive. The upper magnetic head thus approaches the top surface of the magnetic disk.
The eject plate
12
comprises a main plate section
12
-
1
, a side plates
12
-
2
and
12
-
3
and a front end projection
12
-
4
. The main plate section
12
-
1
has a generally U shape. The side plates
12
-
2
and
12
-
3
extend vertically from both side edges of the main plate section
12
-
1
. The front end projection
12
-
4
is for mounting an eject button thereon and extends forward from the front edge of the main plate section
12
-
1
. Two notches
12
-
5
and two holes
12
-
6
are formed in the main plate section
12
-
1
at the position corresponding to the support claws
11
-
5
and
11
-
6
, respectively, of the chassis
11
. Guide grooves
12
-
7
are formed in the side plates
12
-
3
and
12
-
4
, two for each side plate. The guide groove
12
-
7
includes a horizontal portion and a tilt portion.
The eject plate
12
is assembled with the chassis
11
with the support claws
11
-
5
and
11
-
6
passed through the notches
12
-
5
and the holes
12
-
6
, respectively. When being assembled, the configuration of the notches
12
-
5
and the holes
12
-
6
of the main plate section
12
-
1
are supported by the shoulders
11
-
5
a
and
11
-
6
a
of the support claws
11
-
5
and
11
-
6
, respectively. Thus the eject plate
12
is slidable back and forth relative to the chassis
11
. The eject plate
12
is allowed only slight or no movement in the up and down direction and the right and left directions. Though depending on the actual configurations, the notches
12
-
5
and the holes
12
-
6
, as well as the support claws
11
-
5
and
11
-
6
are limitations to such movement.
As described above, the main plate section
12
-
1
has a generally U shape. Therefore, the eject plate
12
is slidable without interrupting operation of the magnetic disk table
14
and the carriage mechanism
15
.
The disk holder
13
has a main base section
13
-
1
, opposing side walls
13
-
2
and
13
-
3
, and four projecting pins
13
-
4
. The main base section
13
-
1
has a notch portion not to cause contact with the upper magnetic head in the carriage mechanism
15
. The side walls
13
-
2
and
13
-
3
extend downward at right angles from both side edges of the main base section
13
-
1
. The free end of the side walls
13
-
2
and
13
-
3
is bent inward to hold the magnetic disk. The projecting pins
13
-
4
are projected outward from the side walls
13
-
2
and
13
-
3
at the position corresponding to the guide grooves
12
-
7
in the eject plate
12
. The disk holder
13
is assembled with the eject plate
12
with the projecting pins
13
-
4
passed through the guide grooves
12
-
7
.
With the above-mentioned structure the disk holder
13
is slidable upward and downward. The disk holder
13
is allowed only slight or no movement in the back and forth direction and the right and left directions. More specifically, the disk holder
13
is slidable upward and downward in cooperation with the back-and-forth movement of the eject plate
12
, depending on the shape of the guide grooves
12
-
7
formed in the eject plate
12
. A tension spring (not shown) is provided between the eject plate
12
and the disk holder
13
. The tension spring pulls the eject plate
12
towards the front portion of the chassis
11
. The eject plate
12
is locked with a locking member (not shown) at a rear portion of the chassis
11
against the pulling force of the tension spring. In addition, there is an eject member (not shown) provided to apply force, in cooperation with the locking member, to the magnetic disk in the direction to eject it out of the assembly. An eject button
12
-
8
is mounted on the front end projection
12
-
4
to allow an operator to eject the magnet
Hayasaka Hideaki
Komatsu Hisateru
Takahashi Makoto
Takahashi Mamoru
Yasuwaki Norito
Davis David
Frishauf, Holtz Goodman, Langer & Chick, P.C.
Mitsumi Electric Co. Ltd.
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