JPS6349891Y2 - - Google Patents

Description

[Detailed explanation of the idea] Industrial applications The present invention relates to a magnetic disk cassette.

Background Art and Problems Randomly accessible magnetic floppy disks are used as recording media for microcomputers and electronic still cameras. Among this type of floppy disk, a mini disk cassette is known as a floppy disk in which a flexible magnetic disk is housed in a so-called hard case. As shown in Fig. 1, a magnetic head insertion opening 2 and a presser pad insertion opening 3 are formed in each of the upper and lower halves of this mini-disk cassette, and these openings are closed to prevent foreign matter and dust from entering. Shutter 4 to prevent
is attached to the cassette shell 1 so as to be openable and closable. The shutter 4 is normally biased in the closed position by a coil spring or locked in the closed position by a locking member inside the cassette shell.

To attach a disk cassette to a recording device or a reproducing device, first, as shown in FIG.
Insert cassette shell 1 inside. During this insertion, the shutter 4 is moved to the open position as shown in FIG. 1 by the opening/closing pin 8 projected inward from the side surface of the cassette holder 7. In this state, cassette holder 7
By placing the magnetic disk 9 face down in the direction of arrow A in FIG. Positioning pins 15, 16
is inserted, and the cassette shell 1 is positioned in the horizontal and vertical directions. Further, the magnetic head 17 is inserted through the head insertion opening 2 and comes into contact with the surface of the magnetic disk 9, while the pad insertion opening 3
A presser pad (not shown) is inserted into the magnetic disk 9, and the head 16 and the pad are pressed against each other while sandwiching the magnetic disk 9.

Since the cassette holder 7 is attached to the chassis 14 via a rotation hinge so as to be vertically movable, the relative position between the cassette holder 7 and the chassis 14 varies depending on the dimensional accuracy at the time of manufacturing. Further, the dimensions of the cassette shell 1 also vary depending on manufacturing precision. Generally, the cassette holder 7 is made somewhat larger than the external dimensions of the cassette shell 1, so that the cassette shell 1 can be moved freely within the holder 7.

However, as described above, since the shutter 4 of the cassette shell 1 is biased to the open position by the shutter opening/closing pin 8 of the cassette holder 7, when inserting the cassette shell 1 into the cassette holder 7, the opening/closing pin 8 and the shutter must be aligned. The length of the opening/closing pin 8 is determined so that the opening/closing pin 8 is engaged with the opening/closing pin 8. Therefore, since the opening/closing pin 8 protrudes, the cassette holder 7
The free movement of the cassette shell 1 within the cassette shell 1 will be restricted to some extent. Note that the dotted line C in FIG. 1 is the outline of the rib between the upper half and the lower half corresponding to the side surface of the cassette shell 1, and when this dotted line C and the tip of the opening/closing pin 8 are in contact, The cassette shell 1 can no longer move laterally.

Due to this restriction, positioning pins 15 and 1 caused by variations in the dimensions of the cassette shell 1 or misalignment between the cassette holder 7 and the chassis 14 can be removed.
It becomes difficult to absorb the deviation between the positioning holes 12 and 13 by the free movement of the cassette shell 1. As a result, there are problems in that it becomes difficult to mount the cassette shell 1, and that the peripheral edges of the positioning holes 12 and 13 are scraped by the positioning pins 15 and 16, resulting in a deterioration in positioning accuracy.

As a countermeasure against this, the cassette holder 7 may be pivotably supported relative to the chassis 14 so as to be movable in the direction of arrow B in FIG. However, these structures increase the number of parts and increase costs.

Purpose of the invention In view of the above-mentioned problems, the object of the present invention is to remove the restriction on the free movement of the cassette shell 1 by the shutter opening/closing pin 8 using an extremely simple structure.

Summary of the invention The invention consists of a cassette housing consisting of upper and lower halves that accommodates a flexible magnetic disk, and a head insertion opening formed in the cassette housing that is slidably attached to the cassette housing to open and close the head insertion opening. In the magnetic disk cassette, the magnetic disk cassette has a shutter, and the shutter is biased to an open position by a protrusion formed in the cassette holder when the cassette housing is inserted into the cassette holder. A recess is provided at the end of the guide groove formed on the side surface of the cassette housing opposite to the inner protrusion, so that the cassette housing can freely move inside the cassette holder without being restricted by the protrusion of the cassette holder. It is designed so that it can be moved to.

Embodiments The magnetic disk cassette of the present invention will be described below with reference to the drawings.

FIG. 3 is a plan view of the magnetic disk cassette of the embodiment, FIG. 4 is a horizontal sectional view of its lower half, and FIG.
Figures A and B are a plan view and a side view of the shutter 4, and Figure 6 is a partially detailed view of the shutter lock mechanism. FIG. 7 is a plan view of the cassette shell installed in the cassette holder.

As shown in FIG. 3, the structure of the upper half 20 of the cassette shell 1 is the same as in FIG. 1, and is designated by the same reference numerals. In FIG. 3, the shutter 4 is biased to the open position, but when not in use, it is locked in the closed position by a locking member 22 attached to the lower half 21, as shown in FIG. That is, as shown in FIGS. 5A and 5B, the shutter 4 is formed by bending a metal plate into a U-shape, and a locking protrusion 23 is formed on the inside of the upper surface by cutting and raising. . On the other hand, the locking member 22 is formed with a recess 24 that engages with the protrusion 23, and when the shutter 4 is biased to the closed position, the protrusion 23 and the recess 24 engage as shown in FIG. , shutter 4 is locked.

This locked state is released by the shutter opening/closing pin 8 when the cassette shell 1 is inserted into the cassette holder 7 as shown in FIG. That is,
When the cassette shell is inserted in the direction of arrow D as shown in FIG. is released. Further, one end of the shutter 4 is pushed by the opening/closing pin 8 and biased to the closed position as shown in FIG.

As shown in FIG. 4, a rib 26 corresponding to the thickness of the cassette shell is formed around the outer periphery of the lower half 21 of the cassette shell 1. As shown in FIG. When the cassette shell 1 is inserted into the cassette holder 7 as shown in FIG. 1, the portion 26a of the rib 26 facing the position of the opening/closing pin 8 (the end of the guide groove 25 indicated by the arrow E in FIG. As shown in Figure 4, it is depressed toward the center of the cassette. That is, a recess 27 is formed in the side surface of the cassette shell 1 facing the opening/closing pin 8.

Because the recess 27 is formed in this way,
When the cassette shell 1 is inserted into the cassette holder 7 and the shutter 4 is biased to the open position as shown in FIG.
Therefore, the cassette shell 1 can freely move within the holder 7. That is, even if there are variations in the external dimensions of the cassette shell 1 or misalignment between the holder 7 and the chassis 14, these errors are absorbed by the movement of the cassette shell 1, and the positioning pins 15, 16 and the positioning holes 12, 13, the cassette shell 1 can be positioned in the horizontal and vertical directions without any trouble.

In the above-described embodiment, a locking member 22 is provided to lock the shutter 4 in the closed position, but the present invention uses a magnetic disc structured so that the shutter 4 is biased in the closed position by a coil spring or the like. It can also be applied to cassettes.

Effects of the Invention As described above, the present invention has a cassette housing 1 facing a protrusion (opening/closing pin 8) provided in the cassette holder 7 for biasing the shutter 4 to the open position.
Since a recess 27 is provided at the end of the guide groove 25 on the side surface of the cassette holder 7, the cassette casing can move freely within the cassette holder 7 without being restricted by the protrusion. Positioning hole 1
2, 13 and positioning pins 15, 1 on the recording/reproducing machine side
Even if a deviation occurs between the cassette and the cassette, it is absorbed by the movement of the cassette, and the cassette can be positioned without any problem.

[Brief explanation of the drawing]

1 and 2 are a plan view and a side view showing a magnetic disk cassette and a cassette holder in the prior art. 3 is a plan view of a magnetic disk cassette according to an embodiment of the present invention, FIG. 4 is a horizontal sectional view of its lower half, FIGS. 5A and B are a plan view and side view of the shutter 4, and FIG. 6 is a shutter lock. FIG. 7, a partial detail view of the mechanism, is a plan view of the cassette shell mounted within the cassette holder. In addition, in the symbols used in the drawings, 1...
...Cassette shell, 2...Head insertion opening, 4...
... Shutter, 7 ... Cassette holder, 8 ... Opening/closing pin, 9 ... Magnetic disk, 11 ... Disk drive spindle, 12, 13 ... Positioning hole, 1
5, 16... positioning pin, 17... magnetic head, 25... guide groove, 27... recess.

Claims (1)

[Scope of utility model registration request] It has a cassette casing consisting of upper and lower halves for accommodating a flexible magnetic disk, and a shutter slidably attached to the cassette casing for opening and closing a head insertion opening formed in the cassette casing, In the magnetic disk cassette, the shutter is biased to an open position by a protrusion formed in the cassette holder when the cassette housing is inserted into the cassette holder. A magnetic disk cassette characterized in that a recess is provided at the end of a guide groove formed on the side surface of opposing cassette cassettes.