JPS6238560A - Shutter opening and closing mechanism for magnetic disc cassette - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a shutter opening/closing mechanism for a magnetic disk cassette, and more particularly to a shutter opening/closing mechanism for a magnetic disk cassette that has an improved opening/closing mechanism for the shutter member of the cassette. be.

[Prior Art] A magnetic disk cassette is known in which a disk-shaped magnetic disk is rotatably housed in a pair of upper and lower cassette halves.

This type of magnetic disk cassette (hereinafter abbreviated as cassette) has a window (head window) into which a magnetic head fits during recording and reproduction, and is further equipped with a shutter member for opening and closing this window.

This shutter member is configured to operate in conjunction with an opening/closing mechanism provided on the magnetic disk device side to open a window when a cassette is loaded and to close the window when a cassette is removed from the device.

The shutter opening/closing mechanism of a conventional cassette of this type is shown in Figure 6~
It is shown in FIG.

Fig. 6 explains a cassette. The cassette L is constructed by combining the upper and lower cassette halves to form a flat housing, and a disk-shaped magnetic disk 2 is rotatably housed inside. has been done.

The magnetic disk 2 has a center hub 3 at its center, and the center hub 3 faces outward from a circular opening 1a formed above and below the center of the cassette 1.

A PG pin 4 is buried in a position away from the center of the center hub 3, and is used for phase control during recording and reproduction.

Further, the cassette 1 is formed with positioning holes 5.6 for mounting.

On the other hand, the shutter 7 is formed in a flat U-shape in cross section, and is slidable between the upper and lower recesses formed on the upper and lower sides of one side edge of the cassette 1. They are movably fitted. An opening 8 is formed on the outer surface of the shutter l.

Also, along with this opening 8, on the outer surface of the end in the direction in which the shutter closes, there is a groove l formed along the outer edge of the cassette l, and a claw 9 that engages with the lock lever 10 and the hook 10a.
It is cut and raised in the direction of fitting into c.

As shown in FIG. 9, the lock lever 10 has a complicated shape and is made of an elastic material such as plastic. Its base is fixed to the cassette half side by pins 12 and 13, and the free end side is attached to the shutter. It extends toward the inside of 7.

A hook loa that engages with the wind 11 is formed at the free end of the lock lever 10 .

This lock lever 10 has a property that its free end side tends to protrude outward due to its own adhesive force, but a stopper 14 provided on the cassette half side has a protrusion 10b protruding inwardly in the middle. It stops when it hits the nail 9.
The passage of the shutter 7 is not obstructed except by locking it with the hook 10a.

Note that the reference numeral 11 in FIG. 9 is a window into which the magnetic head is inserted.

On the other hand, the shutter opening/closing mechanism provided on the magnetic disk drive side has a structure as shown in FIG.

That is, what is indicated by the reference numeral 15 in the figure is a first member having the function of closing the shutter, which is press-molded from a metal plate, and has two upper and lower protrusions 15a.

15b, and the two are connected by a connecting piece 15c.

The protruding piece 15a located on the upper side has a protrusion 16 protruding upward for hooking a spring at a position closer to the shutter side, and a long hole 19 on the other end side in the direction of mounting the cassette. It is formed along. Also, long hole 19
A slope 18 is formed on the opposite side edge.

Further, a hook 17 that fits into the opening 8 of the shutter 7 is formed on the lower projecting piece 15b side.

On the other hand, the reference numeral 22 is a second member for opening the shutter, which is also press-formed from a metal plate. A protrusion 23 for hooking a spring is provided on the edge of the second member 22 opposite to the protrusion 16, and a spring 23 is provided between the protrusion 16 and the protrusion 23.
1 is hung.

A bent portion 26 is provided upwardly protruding from the side edge of the second member 22 opposite to the protrusion 23, and a bent portion 27a is bent downward from the base of the bent portion 26. A pawl 27 is formed that extends toward the cassette side through.

The first and second members 15.22 mentioned above are the first member 1.
The pin 20 fitted into the elongated hole 19 of 5 is inserted into the second member 22.
The first member 15 can be rotated within a predetermined angular range around the pin 20 and within the length range of the elongated hole 19. It can be slid inside.

The reference numeral 28 is a leaf spring, one end of which has a through hole 30,
The pin 31 is fitted into the through holes 29 and 29 from below, respectively, and the pin 31 is inserted into the through hole 24 of the second member 22 at the other end. Fit and swage to secure.

Next, the operation of the opening/closing mechanism configured as above will be explained.

Before installing the cassette 1, the claw 9 of the shutter 7
is engaged with the hook 10a of Lockre, <-10,
The window 11 is in a closed state.

In this state, when the cassette 1 is started to be attached to the apparatus side in the direction of arrow C in FIG.
It rests on the outer edge of the shutter 7 as shown by the dotted line in the figure.

At this time, the first member 15 is rotated slightly counterclockwise (in the direction of the arrow) against the tensile force of the spring 21.

When the cassette is further inserted, the claw 27 begins to push the free end side of the lock lever 1O. Then, the hook loa separates from the claw 9 and the shutter 7 is unlocked.

As the cassette further advances in the direction of arrow C, the tip of the shutter 7 comes into contact with the claw 27, and the shutter 7 begins to open.

Eventually, when the hook 17 comes to a position facing the opening 8 of the shutter, the first member 15 is rotated in the direction of arrow E due to the tensile force of the spring 21, and the hook 17 is moved to a position facing the opening 8 of the shutter.
It is fitted inside.

In this manner, the shutter 7 is opened and recording and reproduction are performed by a magnetic head (not shown).

On the other hand, when removing the cassette, move the cassette to arrow G.
However, since the hook 17 is in the opening 8 at this time, as the shutter 7 moves in the direction of arrow G, it remains in that position together with the shutter 7 within the range of the elongated hole 19.
The shutter begins to close.

Then, the slope 18 of the first member 15 and the bent portion 26 come into contact with each other, and the first member 15 is forcibly rotated in the direction indicated by the arrow in FIG. 1O.

As a result, the hook 17 separates from the opening 8.

At this time, the hook lOa and the claw 9 are almost facing each other,
Moreover, since the claw 27 begins to separate from the lock lever 10, the hook loa and the claw 9a gradually begin to engage with each other.

That is, the shutter 7 closes the window 11, and the window 11 is taken out of the apparatus as it is.

[Problems to be solved by the invention] In the conventional mechanism as described above, the hook 17 and the pawl 27
The distance 11 between them was set to be approximately equal to the distance from the edge of the opening 8 to the tip indicated by the reference numeral in FIG.

Therefore, the hook 17 is not yet fitted into the opening 8 at the time when the claw 27 comes into contact with the lock lever 10 and starts pushing the lock lever.

On the other hand, the hook 17 is moved to the shutter 7 by the force of the spring 21.
is pushed in the direction of arrow 10, so the friction force may push the unlocked shutter 7 in the direction of arrow G and open it before the claw 27 comes into contact with the tip of the shutter 7.

There is no problem if the cassette is further inserted in the direction of arrow C, but if the cassette is pulled out at this point, the shutter will remain open and the cassette will be removed, causing the user's hand to come into contact with the magnetic disk and damaging it. There was a problem that the recorded content may change.

[Means for Solving the Problems] In order to solve the above-mentioned problems, in the present invention, the distance between the hook of the first member and the claw of the second member is adjusted from the tip of the shutter to the opening of the shutter. We adopted a structure where the distance is longer than the distance to the edge of the part.

[Function] When the above-mentioned structure is adopted, the hook is always inserted into the opening of the shutter before the shutter is unlocked, so even if the cassette is pulled out in the middle of loading the cassette, the shutter will not open. This eliminates the inconvenience of being left behind.

[Example] Hereinafter, the present invention will be described in detail based on the example shown in the drawings.

Figures 1 to 5 illustrate an embodiment of the present invention.
In each figure, the same parts as in FIGS. 6 to 10 are designated by the same reference numerals, and their explanations will be omitted.

In this embodiment, as shown in FIG. 1, the claw 27 is provided at a position away from the hook 17 in the cassette mounting direction.

As a result, as shown by reference numeral 2 in FIG. 4, the distance between the hook 17 and the claw 27 is formed to be sufficiently longer than the distance MJ from the tip of the shutter 7 to the tip of the opening 8.

Since the other parts are similar to the conventional structure, their explanation will be omitted to avoid duplication.

The operation of the shutter opening/closing mechanism is as follows.

First, FIG. 2 shows a state in which a cassette I has begun to be loaded into the magnetic disk device.

In this state, the hook 17 of the first member 15 is attached to the shutter 7.
is in contact with the tip of the

When the cassette 1 is further inserted in the direction of arrow C from this state, the first member 15 is pushed by the locked shutter 7 and rotates counterclockwise in FIG. 2 against the tensile force of the spring 21. 3, and the tip of the hook 17 rests on the upper side of the shutter 7, as shown in FIG.

When the cassette is further inserted in this state, the hook 17 is fitted into the opening 8 of the shutter 7, as shown in FIG.

At this time, since the protrusion of the pawl 27 in the cassette insertion direction is sufficiently long as described above, the pawl 27 is on the verge of coming into contact with the lock lever 10, and the shutter 7 has not been unlocked.

Therefore, the shutter 7 will not open inadvertently due to the frictional force generated when the hook 17 presses the outer edge of the shutter 7.

Furthermore, when the cassette is inserted, the claw 2 will open as shown in Figure 5.
7 touches the tip of the shutter 7, and at the same time the lock lever 10
The shutter 7 is opened in order to push it in the direction of unlocking.

At this time, the hook 17 is pushed further than the length m of the opening 8, so it climbs over the edge of the opening 8 and rises to the outer edge of the shutter 7.

In this state, the cassette is inserted to a predetermined position, and recording and reproduction are performed with the shutter 7 fully open.

On the other hand, when the cassette is taken out, the cassette is pulled in the direction of arrow G, so the hook 17 is first fitted into the opening 8.

Then, as the cassette moves in the direction of arrow G, the shutter 7 is held in its position by the hook 17, and the first member 15 is also pulled in the direction of arrow G, and the pin 20 is inserted into the elongated hole 19. Move to the right end in Figure 5.

In this state, the shutter begins to close and eventually closes completely.

On the other hand, as the first member 15 moves in the direction of the arrow G, the slope 18 begins to come into contact with the bent portion 2C, and the first member 15 is forcibly rotated in the direction indicated by the arrow in FIG.

Also, just before this operation, that is, when the shutter is closed, the claw 27 separates from the lock lever 10, so the hook 1
0a engages with the claw 9, and the shutter 7 is locked.

Therefore, even if the cassette is pulled out in this state, the shutter will be pulled out in a completely closed state.

[Effect] As is clear from the above description, according to the present invention, the distance between the hook that closes the shutter and the claw that opens the shutter is determined by adjusting the distance from the tip of the shutter to the opening into which the hook fits. Because the structure is made thicker than the distance, the hook fits into the opening of the shutter before the lock is released, and the friction between the hook and the side edge of the shutter prevents the shutter from being accidentally opened. It will never be opened and can completely protect your magnetic disk.

[Brief explanation of the drawing]

Figures 1 to 5 illustrate an embodiment of the present invention.
Figure 1 is an exploded perspective view of the shutter opening/closing mechanism, Figures 2 to 5
The figure is a plan view explaining the opening/closing operation of the shutter, Figures 6 to 10 are illustrations of the conventional structure, Figure 6 is a perspective view of the cassette, and Figure 7 is a view of the cassette with the upper cassette half removed. The plan view and FIG. 8 are exploded perspective views of the cassette opening/closing mechanism. FIG. 9 is an enlarged plan view of the main part of the cassette, and FIG. 10 is a plan view illustrating the opening operation of the shutter. 1... Magnetic disk cassette 7... Shutter 8... Opening 9.27...
・Claw 10...Lock lever 17...Hookja/wata Raguchibetsu ti's intervention harp r1 review figure 1 sword anus 5, 7f) and the drill testimonial figure 6 top a 111 67, thalf 9-1 Nurictre to Knee l/7fillfl Fig. 7

Claims (1)

[Claims] a first member having a hook that is fitted into an opening of a shutter that is slidably fitted to a magnetic disk cassette; and a second member that has a claw that contacts a lock lever provided on the cassette side that locks the shutter. In the shutter opening/closing mechanism for a magnetic disk cassette having a member, the distance between the hook and the pawl is larger than the distance between the tip of the shutter in the cassette insertion direction and the tip of the opening in the cassette insertion direction. A shutter opening/closing mechanism for a magnetic disk cassette, characterized in that: