JPH03276480A - Method and device for cleaning floppy disk - Google Patents

Abstract

PURPOSE:To remove dust charged with electric charge in a short time by blowing an ionic wind to a magnetic disk exposed from an aperture part for head insertion. CONSTITUTION:A magnetic sheet 1 is rotated, and air is blown from an air blow nozzle 11 in the direction B, and thereafter, a prescribed high AC voltage is impressed to a destaticizing needle 13, and air is sucked in the direction of an arrow C by air suction nozzles 12a and 12b. Air blown from the air blow nozzle 11 is blown as the ionic wind to the surface of the magnetic sheet 1, a liner 7 in the vicinity of the aperture of head insertion, etc., by the destaticizing needle 13 to which the high AC voltage is impressed in this matter, and thereby, dust firmly stuck to the magnetic disk 1 or the like by electrification is easily removed to shorted the time required for the cleaning process.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a floppy disk cleaning method and apparatus for removing dust attached to the surface of a magnetic disk during the floppy disk manufacturing process. , relates to a method and apparatus for removing the above dust by air suction.

(Prior Art) Flexible magnetic disks, which are called floppy disks and are on the market today, are generally housed in a flat and compact case to protect them from external dust. Furthermore, a liner (generally made of non-woven fabric) is attached to the inner wall of this case, and this liner wipes away dust that flows in through the head insertion opening and adheres to the disk surface when the magnetic disk rotates. An attempt is made to remove dust from the disk surface.

Incidentally, in the manufacturing and assembly process in which such a magnetic disk is housed in a case, dust is generated due to mechanical impact during assembly. In particular, when the upper and lower nozzles of the case are bonded together by ultrasonic welding, the liner vibrates due to the ultrasonic waves, and a large amount of the fine constituent powder of the liner falls as dust and adheres to the surface of the magnetic disk. In addition, the liner that has been wiped off with dust will accumulate a large amount of dust inside, so when vibration is applied to the case afterwards, the dust in the liner will fall and adhere to the surface of the magnetic disk. In other words, the liner that should be used to wipe away dust actually becomes a source of dust. If the magnetic disk is subjected to recording and reproducing operations in this state, there is a problem in that dust that cannot be removed by the liner becomes trapped between the magnetic disk and the magnetic head, causing so-called dropout.

To solve this problem, we tried to suck the air inside the storage case through the head insertion opening while rotating the floppy disk during the disk cleaning process of disk manufacturing, and to expel the dust inside the case. A method is known (Japanese Patent Laid-Open No. 82-270087)
(Japanese Patent Application Laid-Open No. 63-64885, etc.).

(Problem to be Solved by the Invention) However, the dust generated from the liner due to the above-mentioned ultrasonic welding becomes electrically charged due to the intense vibration, especially on the outer surface of the liner located near the head insertion opening, the inner wall of the storage case, etc. , strongly adheres to the magnetic disk surface. If the dust adhered in this way is removed by air suction, there is a problem in that the cleaning process takes a long time, making it impossible to improve manufacturing efficiency.

In view of these circumstances, the present invention removes the electrically charged dust in a short time during the cleaning process, and
It is an object of the present invention to provide a floppy disk cleaning method and apparatus that can improve manufacturing efficiency.

(Means for Solving the Problems) The floppy disk cleaning method of the present invention includes:
In order to aspirate the air inside the case and eliminate static electricity from the surface of the magnetic disk exposed through the head insertion opening, the outer surface of the liner located near this opening, and the inner wall of the case, the magnetic It is characterized by blowing ion wind onto the disk surface.

The floppy disk cleaning device of the present invention further includes an air suction means for sucking air inside the case and an air blowing means for blowing air onto the surface of the magnetic disk exposed from the head insertion opening. A static eliminating needle to which a high voltage alternating current voltage is applied is placed in the air flow formed by the air blowing means, and this air flow is applied to the surface of the magnetic disk. Alternatively, it is characterized in that it is configured to generate ionized air to eliminate static electricity from dust adhering to the outer surface of the liner and the inner wall of the case located near the head insertion opening.

(Function) According to the method and apparatus for cleaning a floppy disk of the present invention, an ion wind is blown onto the magnetic disk exposed from the head insertion opening to clean the surface of the magnetic disk or the vicinity of the opening. Since the dust strongly adhering to the outer surface of the liner and the inner wall of the case is neutralized, and the air inside the case is sucked, the dust can be easily removed to the outside of the case.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

The drawing is a schematic diagram showing an embodiment of a magnetic disk cleaning device according to the present invention. This device includes a rotating attachment 2 for rotating a magnetic disk (hereinafter referred to as a magnetic sheet in the embodiment) 1 of a 3.5' micro floppy disk, and upper and lower halves 3 for storing the magnetic sheet 1.
Magnetic head insertion openings 5 formed in a and 3b, respectively.
The air inside the case 3 is sucked through the openings 5a and 5b, and the magnetic sheet 1 is sucked through the openings 5a and 5b.
Dust removal nozzles 4a and 4b that blow ionized air onto the surface of
It is equipped with

The rotary attachment 2 is rotated by a spindle motor 8, and the upper surface of the rotary attachment 2 is made of a magnet, and a center core made of magnetic metal is placed on top of the magnet so that the two can be easily engaged. It is designed to be combined.

Next, the dust removal nozzles 4a and 4b will be explained using FIG. 2 and FIGS. 3(a) and 3(b).

The floppy disk to which this embodiment is applied has a pair of head insertion openings 5a and 5b formed at opposing positions with the magnetic disk 1 in between.
Dust removal nozzle 4a of the same type as a and 5b.

4b are arranged respectively.

The dust removal nozzles 4a and 4b include an air blowing nozzle 11 that blows clean air onto the magnetic disk 1, a static eliminating needle 13 disposed within the air blowing nozzle 11 and to which a high-voltage AC voltage is applied, and this air blowing nozzle 11. It consists of air suction nozzles 12a and 12b arranged on both sides of the case 3 to suck air inside the case 3.

This air blowing nozzle is reliably separated from the air suction nozzles 12a, 12b by a partition wall until it reaches its blowing port, so that the blown ion wind is directly transferred to the air suction nozzle 12a.

12b is reduced, and the effectiveness of dust removal can be increased.

Moreover, as shown in FIG. 3(b), this dust removal nozzle 4a,
4b has three air blowing nozzles lla, Ilb, and lie arranged in its longitudinal direction (radial direction of the disk). The number of air blowing nozzles 11 is 1.
However, in order to increase the dust removal efficiency by expanding the ion wind blowing range in the disk radial direction, it is possible to provide a plurality of air blowing nozzles 11 in the disk radial direction as in this embodiment. preferable. Also, the air suction nozzle 12a.

The suction port 12b is located along both edges of the head insertion openings 5a and 5b facing each other in the disk circumferential direction as shown in FIG. 3(b).
It is formed in the shape of a groove as shown in the figure. By arranging the suction port in this manner, it is possible to suck out even debris from the liner 7 that is still attached to the inside of the case. In addition, since linear suction is performed over a long range in the disk radial direction, the magnetic disk 1 is deformed every once in a while.
By increasing the degree of adhesion of the liner 7, the cleaning effect can be improved. In addition, this air suction nozzle 4
a, 4b are connected to a suitable air suction source. Furthermore, the air suction pressure by the air suction nozzles 12a and 12b is approximately 300 to 800 ff1llIN (approximately 20%).If the air suction pressure is higher than this, it becomes difficult to maintain suction balance and the magnetic disk 1 is deformed. The suction flow rate is set to about 0.1 to 0.5 m3/l1in for each suction nozzle 12a and L2b.

On the other hand, the blowing flow rate from the air blowing nozzle 11 is set to about 1710 to 172 of the above-mentioned suction flow rate.

If the amount is more than this, dust will be pushed into the case 3 and the cleaning effect of the liner 7 will be reduced, and if it is less than this, the dust removal process will not be effective.

In addition, the voltage applied to the static eliminating needle 13 is 1000 to 10000.
V.

The frequency is lO~200Hz, preferably 500Hz each.
0V.

The frequency shall be approximately 60Hz.

Further, the magnetic disk 1 and the dust removal nozzle 4a.

4b is set to about 0.5 to 2.0 m.

In order to prevent deformation of the magnetic disk 1, the air suction pressure, air suction flow rate, air blowout flow rate, distance from the magnetic disk 1, etc. of both dust removal nozzles 4a and 4b are set to be the same.

In addition, in FIGS. 3(a) and 3(b), an air suction tube 15 for suctioning air from the air suction nozzles 12a and 12b by a vacuum pump, and a high voltage cable for connecting to the static elimination needle 13 are shown. The positions of the cable port 16 and the air supply port 17 for supplying compressed air to the air blowing nozzle 11 are shown. Note that four elongated holes 18 for mounting fittings are formed in the side slopes of the dust removal nozzles 4a, 4b.

Further, this device includes a pair of stoppers 8a for setting the nozzles 4a, 4b at predetermined positions when the dust removal nozzles 4a, 4b perform dust removal processing.

6b. The magnetic head insertion openings 5a and 5b are formed to have a width corresponding to at least the radial width of the recording area of the magnetic sheet 1.

Hereinafter, a method of cleaning the magnetic sheet 1 using the above apparatus will be explained. First, the magnetic sheet 1 is set on the rotating attachment 2. At this time, the distance between the dust removal nozzles 4a, 4b and the magnetic sheet 1 is set to be greater than the distance shown in the drawings, so that the magnetic sheet 1 can be easily set.

Thereafter, the two dust removal nozzles 4a, 4b move toward the magnetic sheet 1 so as to narrow the distance therebetween, and the tips of the two dust removal nozzles 4a, 4b touch the stopper 8, respectively.
When it reaches positions a and 8b, it stops moving. At this time, the suction ports of both dust removal nozzles 4a, 4b are set at predetermined positions facing the magnetic head insertion openings 5a, 5b, as described above.

Thereafter, by rotating the rotating attachment 2 in the direction of arrow A, the magnetic sheet 1 is rotated in that direction. The rotational speed of the magnetic sheet 1 at this time is lo~10
00 rpm, preferably 300 rpm.

Next, air is blown out from the air blowing nozzle 11 in the direction of arrow B in the figure, and then a predetermined high-voltage AC voltage is applied to the static elimination needle 13. The reason why voltage is applied after blowing out air is to prevent dust from directly adhering to the static eliminating needle 13. After the voltage application, the air suction nozzle 12a is opened with a delay of about 0.1 degree.

12b performs air suction in the direction of arrow C. In this way, in this embodiment, the static eliminating needle 1 to which a high voltage AC voltage is applied is
3, the air blown from the air blowing nozzle 1 is blown as ionized wind onto the surface of the magnetic disk 1 and the liner 7 near the head insertion openings 5a and 5b. As a result, the dust adhering to the area blown with the ionized wind is neutralized and blown away. The blown dust is sucked together with the air inside the case 3 by the air suction nozzles 12a and 12b and discharged to the outside. Note that since the air suction flow rate is set larger than the air blowout flow rate, not only the blown dust but also the dust adhering to the surface of the magnetic disk 1, the head insertion opening 5a, Part of the dust adhering to the liner 7 near the edge of the liner 5b can also be directly suctioned.

Further, the cleaning period is set to a period during which the magnetic sheet 1 rotates three times or more. Note that in order to reduce the amount of charge on dust, it is desirable that the humidity is 50% or more.

Note that the size of the magnetic sheet and the shape of the case to which the present invention can be applied are not necessarily limited to those of the above embodiments.

Further, the rotational speed of the magnetic sheet, the air suction flow rate, and the cleaning period are not necessarily limited to those of the above embodiment, and the voltage value and frequency of the high voltage AC voltage applied to the static elimination needle 13 are constant values. The value is not limited to the above, and an appropriate value may be selected depending on the amount of dust attached to the surface of the magnetic disk 1 and the like.

In the above-described embodiment, after the magnetic sheet 1 is set on the rotary attachment 2, the suction nozzles 12a and L2b are moved in the direction of the magnetic sheet to facilitate the installation of the magnetic sheet. , instead of the above two suction nozzles 12a, 1
2b may be fixed and the rotary attachment 2 in which the magnetic sheet 1 is set may be moved in the radial direction of the magnetic sheet 1.

(Effects of the Invention) According to the floppy disk cleaning method and apparatus of the present invention, by blowing ion wind onto the magnetic disk, dust strongly attached to the magnetic disk, etc. is neutralized and blown away. At the same time, by suctioning the air inside the case, the blown dust is discharged to the outside of the case, so dust that has strongly adhered to magnetic disks etc. due to charging can be easily removed, making it easy to remove during the cleaning process. The required period can be shortened, thereby improving the manufacturing efficiency of floppy disks.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing one embodiment of the floppy disk cleaning device of the present invention, FIG. 2 is a schematic diagram showing a part of the device shown in FIG. 1 on an enlarged scale, and FIG. 1 is a front view showing the dust nozzle, and FIG. 3(b) is a bottom view thereof. 1... Magnetic disk 2... Rotating attachment 3... Case 3a... Upper half 3b
...Lower half 4a, 4b...Dust removal nozzle 5a, 5b...Magnetic head insertion opening 7...
Liner 8... spindle motor 11,
lLa, llb, lie - Air blowing nozzles 12a, 12b... Air suction nozzles 13.
... Static elimination needle number! Figure diagram

Claims (2)

[Claims] (1) In a method for cleaning a floppy disk, the air inside the case is sucked through a head insertion opening formed in the case while rotating a magnetic disk housed in the case. A method for cleaning a floppy disk, characterized in that the magnetic disk exposed through the head insertion opening is blown with ion wind. (2) a magnetic disk rotating means for rotating a magnetic disk housed in the case; and an air sucking air inside the case, which is disposed at a position facing a head insertion opening formed in the case. a suction means; an air blowing means disposed close to the air suction means for blowing air onto the magnetic disk; and a high-voltage AC voltage located in the flow of air blown onto the magnetic disk. A floppy disk cleaning device comprising: a static eliminating needle to which is applied an electric charge;