JPH0675324B2 - Checking device for floppy disk drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a floppy disk drive device (hereinafter referred to as FD).
It relates to a floppy disk (hereinafter referred to as FD) chucking device in D).

[Prior art and its problems] The currently used FD is 130 m specified in JIS C 6291.
There are FD1 with only a center hole such as mFD and FD2 with a metal hub bonded to the center hole.

The former FD1 is chucked (held) by a hub stand and a collet placed opposite it.

On the other hand, the chucking mechanism of the latter FD2 with metal hub is
Without using a collet, with a magnet for attracting a metal hub,
Only the hub base having the drive pin that engages with the drive hole provided in the metal hub is held and rotated.

The former FD1 is housed in a flexible jacket, and the latter FD2 is housed in a hard case. Both forms of FD cannot be used in FDD.

In addition, the latter FD2 has better accuracy and stability than the former FD1 chucking because the positioning of the FD chucking is the engagement of the drive hole and the metal of the drive pin compared to the former FD1. is there.

This chucking accuracy and stability are indispensable requirements for increasing the capacity of FDDs, but the former FD1, for example, 130mm FD, is already on the market in large quantities, which hinders the spread of the latter FDD for FD2. Has been.

Therefore, the present invention is based on the former, which is generally distributed in large quantities.
The purpose of the present invention is to provide a chucking device capable of sharing the FD1 and the latter FD2, which is excellent in chucking accuracy and stability.

[Means for solving problems]

The present invention has been made to solve the above-mentioned problems, and a hub base is provided with an adsorption magnet at the center of the upper surface.
An annular groove having an outer cylindrical surface is provided on the outer side of the annular groove, and a drive pin that can move axially to the center side of the annular groove and is biased toward the medium and a protrusion that fits into the concave portion or the central hole of the medium. On the other hand, the collet is provided with a convex portion that elastically fits the outer cylindrical surface and a holding surface that faces the holding surface of the hub base.

〔Example〕

Embodiment 1 FIG. 1 is a perspective view of Embodiment 1, and FIG. 2 is an enlarged sectional view showing the structure of the main part thereof. 4 is a hub base fixed to a spindle 6 and 5 is a shaft attached to a movable arm 7. It is a collet that is rotatably attached to 8.

The hub base 4 is provided with a ring-shaped attracting magnet 1 in a recess 4b provided at the center of the upper surface, and an annular groove 2 having an outer cylindrical surface 2a and an inner cylindrical surface 2b on the outer side thereof, and a protrusion A at the center. And a drive pin 3 which is axially movable from the inner cylindrical surface 2b of the annular groove 2 and is urged by a spring piece 9 in the FD direction.

Further, the collet 5 has a structure having a convex portion 5a having an inclined surface 5b that is elastically fitted to the outer cylindrical surface 2a, and a holding surface 5b facing the holding surface 4a of the hub base.

The medium FD2 with a metal hub used in this embodiment is
As shown in FIGS. 4 and 5, a metallic hub piece 12 having a drive hole 11 on the upper surface and a hub ring 13 fixed on the lower surface to form a recess B for engaging with the projection A are formed. The inner diameter of the hub ring 13 is made slightly larger than the outer diameter of the inner cylindrical surface 2b of the annular groove 2, that is, the outer diameter of the projection A, and the inner wall of the hub ring 13 is provided with two mutually orthogonal surfaces 13a, 13a for positioning. ing.

The hub base may be made of plastic containing a magnetic component, and the magnet portion may be made by magnetizing.

[Chucking of FD2 with metal hub] For chucking of FD2 with metal hub, as shown in FIG. 4, the collet 5 is not used and is kept in a state of being raised.

In this case, the FD2 with metal hub is attracted by the magnet 1 on the hub base 4, the hub ring 13 is fitted in the annular groove 2,
When the hub base 4 rotates and the drive pin 3 coincides with the drive hole 11, the drive pin 3 is fitted into the drive hole 11 to drive the FD2.

[Chucking of FD1 Only in Center Hole] The chucking of the FD1 is performed by lowering the movable arm 7 to move the convex portion 5a of the collet 5 to the FD1 in the same manner as a generally used chucking device. The center hole is penetrated and elastically fitted into the annular groove 2, and the holding portion 5b and the holding portion 4a of the hub base 4 hold the FD1 with a predetermined force.

Embodiment 2 FIGS. 7 and 8 show Embodiment 2, respectively, and FIG. 7 shows a state in which FD2 'is chucked and FIG. 8 shows a state in which FD1' is chucked.

The difference between the second embodiment and the first embodiment is the 3.5-inch FD2 'with a hard case and the FD1' with a jacket provided only with a center hole, which are currently popular due to the difference in the structure of the FD. It is intended for dual use.

That is, FD2 'has a central hole 1 in the metal hub as shown in FIG.
4 and the driving hole 15 are provided, the protruding shaft 17 (projection) is fitted to the hub base 16 with the central hole 14 that also serves as a spindle.
Is different from the first embodiment, and the other structures are basically the same as the first embodiment.

In addition, 1'is an attraction magnet that also serves as a pedestal for the FD 2 '.

When the FD2 'is used, the chucking device configured as described above is chucked only by the hub base 16 as shown in FIG. 7, and when the FD1' is used, the hub base 1 is used as shown in FIG.
Chuck with 6 and collet 5.

〔The invention's effect〕

As described above, according to the chucking device according to the present invention, it is possible to chuck the FD1 with only the center hole or the FD2 with the metal hub, and use abundant distribution FD1 and high density with high accuracy and stability. It is possible to expand the application to compatible FD2.

[Brief description of drawings]

FIG. 1 is a perspective view of a first embodiment of the present invention, FIG. 2 is an enlarged cross-sectional view showing the structure of the main part thereof, FIG. 3 is a plan view of a hub base in the first embodiment, and FIG. With metal hub
FIG. 5 is a sectional view of the FD2 at the time of chucking, FIG. 5 is a sectional view taken along the line XX, and FIG.
Fig. 7 is a sectional view of the FD2 'with a metal hub according to the second embodiment when it is chucked.
The drawing is a cross-sectional view of the FD1 'having only the center hole in the second embodiment when being chucked. 1 ... attraction magnet 2 ... annular groove 3 ... drive pin 4 ... hub stand 5 ... collet

Claims (1)

[Claims] 1. A magnet for attraction is provided in the center of the upper surface, and an annular groove having an outer cylindrical surface is provided outside the magnet, and the magnet is axially movable toward the center of the annular groove and is biased in the medium direction. A hub having a drive pin and a protrusion that fits into the recess or center hole of the medium; a protrusion that elastically fits into the outer cylindrical surface; and a collet having a holding surface that faces the holding surface of the hub base. A chucking device for a floppy disk drive device, which is characterized by being provided.