JPS5840264B2 - Floppy disk positioning device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a floppy disk drive, and more particularly to a positioning device for determining the relative position of a floppy disk mounted in the drive with respect to a magnetic head.

Before explaining a conventional floppy disk positioning device, the general structure of a floppy disk drive will be briefly explained with reference to FIG.

The recording medium used in a floppy disk drive is called a floppy disk. For example, a recording medium (floppy disk) 1 is made by processing a mylar sheet with a thickness of about 0.08 mm into a disk shape and magnetically coating both sides.
5 is housed in a square plastic case 20.

Stable contact between the magnetic coating surface of the floppy disk 15 and the magnetic head leads to reliable recording and reproduction, and is an important point in the design of a floppy disk drive.

The floppy disk 15 is inserted into the floppy disk drive device 21 while being housed in the outer case 20, is chucked at the disk center hole 25, and is rotationally driven by a drive motor 23 and a drive belt 24.

A carriage 12 carrying a magnetic head is supported by two guide rods 14 so as to be able to move forward and backward on a long hole for recording and reproducing provided in the floppy disk outer case 20, and a step motor 22 and a steel belt 13 move the floppy disk. The disk 15 is positioned and moved in the track (radial) direction.

In a floppy disk drive, as mentioned above, it is important to maintain stable contact between the floppy disk and the magnetic head, and to do so, it is necessary to precisely control the relative position of the height of the magnetic head and the height of the floppy disk. be.

Conventionally, therefore, relative positioning of the floppy disk and the magnetic head has been performed using a positioning device as shown in an enlarged cross-sectional view in FIG.

That is, a reference surface 17 is fixedly provided near the carriage 12, and the floppy disks 15, 20 are placed on the reference surface 17.
The relative position with respect to the magnetic head 3.degree. 4 was determined by pressing it in the direction of arrow 19 through an elastic member 16 such as a sponge.

However, as is clear from FIG. 2, the floppy disk 15 is extremely flexible, so even if it is positioned on the reference plane 17, the floppy disk 15 may bend or deform on the magnetic heads 3 and 4. A positional error had already occurred (the floppy disk was deformed as indicated by the dotted line 15' in FIG. 2), and stable contact with the magnetic head could not be obtained.

Therefore, the floppy disks that could be used in the device were limited, making the device extremely difficult to use.

In addition, as a manufacturing problem, as is clear from FIG.
It was necessary to measure the head height from the reference hole, which required high dimensional accuracy on both the equipment side and the head side, resulting in extremely poor productivity.

SUMMARY OF THE INVENTION An object of the present invention is to provide a floppy disk positioning device that can solve the above problems.

Therefore, the positioning device according to the present invention provides a plurality of reference surfaces on the carriage close to the magnetic head, and
A pressing surface is provided on a member fixed to the carriage, and the floppy disk is elastically pressed against the reference surface by this pressing surface.

Next, one embodiment of the present invention will be specifically described.

FIG. 3 is an exploded perspective view of a magnetic head assembly embodying the present invention, and FIG. 4 is a schematic sectional view of FIG. 3.

Note that the same parts as in FIG. 1 will be described with the same reference numerals.

In both figures, a lower substrate (carriage) 12 is moved and positioned along a guide rod 14 by a steel belt 13.

A lower magnetic head 3 is installed on the inner surface (upper surface side) of the lower substrate 12.
is provided, and four rotatable rollers 1 set at the reference height of the magnetic head 3 are arranged near the roller.

Further, an upper substrate 10 fixed to the upper surface side of the lower substrate 12
A magnetic head 4 having a support structure capable of applying pressure and four rollers 2 having a structure capable of applying pressure are arranged near the magnetic head 4.

The pressure rollers 2 are urged downward two by two by pressure springs 7, so that an appropriate pressure can be obtained.

The magnetic head (upper surface) 4 is fixed to the upper head support member 8 connected to the upper substrate 10 by a support plate 9 via a gimbal mechanism, and by moving the hook 11 up and down, the magnetic head can be pressed against or released from the floppy disk. You can.

Now, the floppy disk 15.2 inserted in Figure 4
0 is pressed against the reference roller 1 with an appropriate pressing force by the pressure roller 2 which is elastically urged downward, and is positioned by being sandwiched between both rollers.

That is, the uppermost portion of the circumferential surface of the reference roller 1 serves as a reference surface for determining the positions of the floppy disks 15 and 20 in the height direction (direction perpendicular to the magnetic head 3).

The lowermost portion of the circumferential surface of the pressure roller 2 acts as a pressing surface against the floppy disk.

As shown, the floppy disk 15, 20 is held under pressure by rollers 1, 2 located very close to the magnetic heads 3, 4.

Therefore, even if the floppy disk bends and deforms as shown by dotted lines 15' and 15'', the relative positioning between the magnetic head and the floppy disk is maintained correctly, thus ensuring stable contact between the magnetic head and the floppy disk. Secured.

Needless to say, since the rollers 1 and 2 also rotate as the magnetic head assembly moves, there is no need to worry about excessive stress being applied to the floppy disk or the like.

As is clear from the above explanation, since the floppy disk is positioned near the magnetic head, stable contact between the magnetic disk and the floppy disk can be ensured, and the position reference plane of the floppy disk is located near the magnetic head assembly (carriage). Since the height of the position reference plane only needs to be correctly defined with respect to the carriage, this is extremely advantageous in terms of manufacturing compared to the prior art.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of a floppy disk drive device, FIG. 2 is a schematic sectional view showing a conventional floppy disk positioning device used in the drive device as shown in FIG. 1, and FIG. 3 is a schematic diagram of a positioning device according to the present invention. FIG. 4 is an exploded perspective view of the magnetic head assembly incorporating the embodiment, and FIG. 4 is a schematic sectional view of the magnetic head assembly of FIG. 3 with a floppy disk inserted. 1...Reference roller (reference surface), 2...
Pressure roller (pressing surface), 3, 4...Magnetic head, 7...Pressure spring, 10...Upper board, 12...Lower board (carriage), 1
5...Floppy disk.

Claims (1)

[Claims] 1. A plurality of reference surfaces that are provided on a lower substrate on which a magnetic head is mounted in close proximity to the magnetic head and that are movable only in a direction parallel to the movement direction of the lower substrate, and that face the reference surface of the lower substrate. 1. A floppy disk positioning device comprising: a pressing surface provided on an upper substrate positioned as shown in FIG.