JPH0250545B2 - - Google Patents

Description

TECHNICAL FIELD The present invention relates to a magnetic disk device, and more particularly to a magnetic disk device having a mechanism for attaching and detaching a magnetic disk cassette.

BACKGROUND OF THE INVENTION In recent years, floppy disks (magnetic disks), which are advantageous over magnetic tapes and the like in that they can be accessed randomly and at high speed, have become popular as recording media for computers and the like.

Usually, magnetic disks are housed in a case to prevent damage, and cases made of flexible plastic and cases made of hard plastic are known.

In the case of a hard plastic case, the head window, which is provided to write and read information on the magnetic disk, is normally biased by a closing spring to protect the disk. It is common that the door is closed using a closed shutter plate.

Unlike the case of a soft case, a disk cassette consisting of a magnetic disk housed in such a hard case can use an eject mechanism similar to that of a cassette tape, but in this case, the eject mechanism described above for closing the head window can be used. A method using the biasing force of a spring is effective for downsizing and simplifying the drive device. However, normally, the spring for closing the head window can only apply as much biasing force as is necessary to close the shutter plate, so the force of this spring alone is insufficient to eject. There will be cases where this is not possible.

Purpose The present invention has been made in view of the above-mentioned drawbacks of conventional devices, and provides a magnetic disk device having a disk eject mechanism that can reliably eject a disk cassette using the force of a spring inside the cassette. The purpose is to

In order to achieve the above object, in the present invention, the head window portion is normally closed by the internal first biasing means, and when in use, the engaging portion coupled to the first biasing means closes the head window portion. In a magnetic disk device using a disk cassette of a type in which a head window section is opened by displacing a biasing means, a second biasing means coupled to an engaging means capable of engaging with the engaging portion is provided on the device side. is provided, and the disk cassette is ejected by the urging force of both the second urging means and the first urging means on the disk cassette side.

Embodiments Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

FIG. 1 shows a disk cassette 1 used in the magnetic disk device of the present invention.

In the figure, a magnetic disk is housed in a hard plastic case 1', and a head window 2 is provided for accessing the magnetic disk housed inside, such as writing and reading information. There is. This head window 2 can be opened and closed by a shutter plate 3 to protect the disk.

This shutter plate 3 is normally closed by a biasing force such as a spring provided inside the case 1', but it is fixed to a shutter opening/closing band 5 provided on the side surface of the case 1' by means not shown. The shutter plate 3 can be opened by pushing the shutter opening/closing pawl 4 in the direction a in the figure. However, here the sign is 6
The hole shown by is a positioning hole for positioning and fixing the disk cassette within the magnetic disk device.

FIG. 2 shows the structure of the magnetic disk drive device of the present invention.

This figure shows a cross section of the disk cassette accommodating portion of the device in a state where the disk cassette 1 has not been inserted from the insertion opening 11 to the normal position. The left and right inner surfaces of the accommodating part are formed into guide plates 9 and 10, and the guide plates 10 have pins that can engage with the shutter opening/closing claw 4 of the case 1' when the disk cassette 1 is inserted into the accommodating part. 8 is provided.

This pin 8 is formed integrally with a slider 8' attached to the outside of the guide plate 10, for example, and is configured to be able to slide along a long hole provided in the guide plate 10.

Further, one end of the slider 8', which is integrally formed with the pin 8, is connected to the pin 1 which is protruded from the guide plate 10.
2, and is constantly urged in the direction of arrow c in the figure by the urging force of this spring 13.

A positioning pin 7 is provided on the bottom surface 15 at the innermost part of the disk housing portion at a position where it can engage with the positioning hole 6 of the case 1' when the disk cassette is inserted.
is provided. For example, the positioning pin 7 normally protrudes upward by a biasing member such as a spring, but sinks into the bottom surface 15 in conjunction with depression of an eject button (not shown) provided on the operation panel of the device. It's becoming like that.

In order to load the disk cassette 1 in the above configuration, the disk cassette 1 is pushed through the insertion opening 11 in the direction shown by the arrow b in FIG. As a result, first, the shutter opening/closing pawl 4 fixed to the shutter opening/closing band 5 of the case 1' engages with the pin 8 provided on the guide plate.

As the disk cassette 1 is further pushed in, the pin 8 compresses and deforms the spring 13 and pushes the shutter opening/closing claw 4 in the direction shown by arrow c in FIG. The shutter plate 3, which is linked to 4, opens.

When the disk cassette 1 is further pushed in completely, the positioning pin 7 provided on the bottom surface 15 at the innermost part of the housing section fits into the positioning hole 6 of the case 1'.
The disk cassette 1 is fixed within the housing. As a result, the spring 13 coupled to the slider 8' is fixed in a compressed and deformed state.

In order to eject the disk cassette 1, the positioning pin 7 is retracted into the bottom surface 15 by pressing the eject button provided on the front panel described above. As a result, the fitting between the positioning hole 6 and the positioning pin 7 is released, and the spring for closing the shutter plate 3 provided in the case 1' is released.
The disk cassette 1 can be ejected from the accommodating portion by the urging force of both the compressed spring 13 and the compressed spring 13.

Next, FIG. 3 shows a second embodiment of the present invention.

In the embodiment according to FIG. 3, the pin 8 is not mounted on the guide plate 10, but on the moving belt 16 which performs a folding movement along the deflection guide 15. The distal end of the moving belt 16 is provided with an engaging member for engaging with the case 1' when the case 1' is inserted, and the opposite end is attached to a spring 14 fixed to the device side. combined.

When loading a cassette with the above configuration, the case 1' pushes the moving belt 16, thereby causing the spring 14 connected to the end of the moving belt 16 to
is compressed and deformed, and at the same time, the pin 8 provided on the moving belt 16 moves in the direction of arrow d in FIG. 3 by the amount of push.

Therefore, the distance required to push the disk cassette 1 in order to open the shutter plate 3 is half that of the embodiment shown in FIG. 2, which helps to shorten the depth of the apparatus.

In this embodiment as well, the disk cassette can be ejected by unfitting the positioning hole 6 and the positioning pin 7, and then releasing the spring 1 for closing the shutter plate 3 in the case 1' and the spring 1 connected to the moving belt 16.
It is discharged by both urging forces of 4.

In the above description, the positioning pin 7 is provided on the bottom surface of the inner part of the housing part, but the position of the positioning pin is not limited to this, and it goes without saying that the positioning pin 7 may be provided anywhere inside the housing part.

Effects As is clear from the above description, according to the present invention, the head window section is normally closed by the internal first biasing means, and when in use, the head window section is closed by the internal first biasing means. In a magnetic disk device using a disk cassette of a type in which a head window portion is opened by displacing the biasing means by an engaging portion, the device is engaged with an engaging means capable of engaging with the engaging portion on the device side. A structure is adopted in which a second urging means is provided and the disk cassette is ejected by the urging forces of both the second urging means and the first urging means on the disk cassette side. According to this structure, the disk cassette is ejected by engaging the engaging portion and the engaging means and causing the first and second biasing means to cooperate, so that a reliable ejecting operation can be performed. Furthermore, since the disk ejecting mechanism is assembled in one place, it does not take up much space and can contribute to miniaturization of the device. Furthermore, by making the engaging means on the device side movable, it is possible to absorb to some extent a contact error between this engaging means and the engaging portion on the cassette side.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the configuration of a magnetic disk used in the present invention, and FIGS. 2 and 3 are schematic sectional views showing different embodiments of the magnetic disk device of the present invention. 1... Disk cassette, 1'... Case, 2... Head window, 3... Shutter plate, 4... Shutter opening/closing claw, 6... Positioning hole, 7... Positioning pin,
8... Pin, 9, 10... Guide plate, 13, 14... Spring, 15... Deflection guide, 16... Moving belt.

Claims (1)

[Scope of Claims] 1. Normally, the head window portion is closed by an internal first biasing means, and when in use, the biasing means is displaced by an engaging portion coupled to the first biasing means. In a magnetic disk device using a disk cassette of a type in which a head window is opened by opening the head window, a second biasing means is provided on the device side and is engaged with an engaging means capable of engaging with the engaging portion. A magnetic disk device characterized in that the disk cassette is ejected by the urging force of both the second urging means and the first urging means on the side of the disk cassette.