JPS62112264A - Shutter opening/closing mechanism for disk cassette - Google Patents

Abstract

PURPOSE:To open and close a shutter even for the disk cassette whose shutter has a large sliding load without fail by constituting a shutter closing member of an elastic member, making action force to a lock means of the shutter small, and engaging force to engage with the aperture part of the shutter large. CONSTITUTION:A closing member 17 is formed by a steel wire, etc., and bent approximately in a V-shaped way as a whole. When the magnetic disk cassette is mounted, first, a bending part 18e is fitted into a groove 8, the base part of an arm 11a of the lock lever 11 is pushed, a contacting part 22 to a support 19 of an arm 11b is separated from the support 19 and the arm 11a of the lock lever will not be pushed up. Consequently, a shutter 7 is kept in a locking condition, accompanying the proceeding of a magnetic disk cassette 2, the bending part 18e runs on to the outer side end of the shutter 7 and soon, fitted into an aperture 7a. Since the arm 18b is brought into contact with the support 19 through the contacting part 22, even when the sliding load of the shutter 7 is large, the engaging condition between the contacting part 18e and the edge end of an aperture part 7a is not released.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a shutter opening/closing mechanism for a disc cassette.
More specifically, the present invention relates to a shutter opening/closing mechanism for a disk cassette in which no force is applied in the shutter closing direction.

[Prior Art] For example, some magnetic disk cassettes have a structure in which, when not in use, a shutter is closed and a portion of the cassette is partially closed by inserting a magnetic head or the like into the cassette.

The shutters of this type of magnetic disk cassette include those that are always biased in the closing direction by a spring or the like, and those that are not biased.

Figure i3~ shows a type of shank opening/closing mechanism in which the shutter is not biased in the closing direction by a spring, etc.
It is shown in FIG.

FIG. 3 illustrates a magnetic disk cassette. A magnetic disk 1 is rotatably housed in a magnetic disk cassette 2 made of plastic or the like.

A center hub 3 is fixed to the center of the magnetic disk 1, and faces into an opening 5 formed in the center of the cassette.

A PG pin 4 for indicating the rotational phase of the disk is embedded in the center hub 3.

Openings 6 into which magnetic heads and the like are fitted are formed on the upper and lower sides of the magnetic disk center t.2.

During this time, the section 6 is opened and closed by a shantaff fitted so as to be slidable so as to sandwich the lower part from the side edge of the cassette.

This shank 7 is slidable in the P and Q directions as shown by the arrows.

A long and narrow opening 7a is formed at the side edge of the shutter 7.

Moreover, at the side edge on the side where this shutter 7 is provided,
A groove 8 is formed in the cassette.

Through holes 9 and 10 are formed in predetermined positions of the magnetic disk cassette 2 for positioning when the magnetic disk cassette 2 is mounted on the apparatus side.

In addition, a claw 7b is formed on the side edge of the shank 7 at a position closer to the cassette mounting direction than the opening 7a.

- On the other hand, a lock lever 11 made of synthetic resin or the like is provided within the cassette at a position closer to the cassette mounting direction than the opening 6.

This lock lever 11 has its proximal end connected to a pin 12.13.
It is fixed to the center side by.

The free end side of this long lever 11 extends between the open part 6 and the outer edge of the shutter 7, and has two wooden arms 11a and llb.

A hook lie is formed on the outside of the tip of the longer arm 11a, and this hook lie is engaged with the claw 7b.

Further, the other arm 11b is formed short, and this arm 11
b is engaged with a stopper 14 also formed in the cassette, and the rotation of the lock raper 11 in the counterclockwise direction in the figure is restricted.

On the other hand, on the side of the magnetic disk device into which the magnetic disk cassette 2 is mounted, an opening pawl 15 is provided which fits into a groove 8 formed on the side edge of the cassette.

This opening claw 15 is engaged with the tip edge 7C of the shirt tough.

Further, on the side of the magnetic disk drive, a closing lever 16 is provided in the t-state so as to be substantially parallel to the cassette 2 to which it is attached.

The proximal end of the closing lever 16 is fixed, and a bent portion 16a is formed at the free end of the distal end toward the cassette side.

Next, the operation of the conventional structure configured as described below will be explained.

Before installing the magnetic disk cassette 2, the shutter 7
is closed, and the hook llc formed on the arm 11a of the lock lever 11 is engaged with the pawl 7b.

Further, the closing lever 16 is biased in the direction of arrow H due to its elasticity.

In this state, when the magnetic disc cassette 2 is installed in the direction of arrow C in FIG. 16a rides on the side edge of the shutter 7.

Then, the opening claw 15 eventually opens the arm 11 of the lock lever 11.
The arm 11a is pressed in the direction of arrow A, and the claw 7b and the hook llc are disengaged.

When the magnetic disc cassette 2 is further pushed in, the opening claw 15 comes into contact with the edge 7clζ of the shutter 7, and in order to keep the unlocked shutter 7 in place, the shank is opened as the cassette advances. As a result,
The magnetic disk l is exposed through the opening 6.

At this time, the bent portion 16a of the closing lever 16 is fitted into the opening 7a of the chanterf.

In this state, magnetic recording is performed by a magnetic head (not shown).
Regeneration takes place.

On the other hand, when ejecting the magnetic disk cassette 2, the cassette moves in the opposite direction to the direction of arrow C.

Then, since the bent portion 16a of the closing lever 16 is fitted into the opening 7a of the shutter, the shutter 7 remains in that position and only the magnetic disk 2 begins to be removed.

Then, since the opening claw 15 also increases by one from the lock lever 11, the arm 11a returns to the direction of arrow B in FIG. 5, and eventually the claw 7
b engages with the tip of arm 11a, pushes arm 11a up in the direction of arrow A, and engages with hook llc.

When the shutter 7 is completely closed, the closing lever 16
bends outward, the bent portion 16a rides on the outer edge of the shutter 7, and the cassette 2 is ejected together with the chanter.

[Problems to be Solved by the Invention] By the way, with the above-described structure, the opening and closing operations are performed without any problem as long as the load when the shutter 7 slides is sufficiently small, but the load when the shutter slides is about 70 g at maximum. If there is such a large load, it will be difficult for the bent portion 16a of the closing lever 16 to hold the shutter 7 in the closing direction via the side edge of the opening 7a when the shutter is closed, and the bent portion 16a will come off from the opening 7a. A problem arises in that the shutter cannot be closed.

If the spring force of the closing lever 16 is strengthened to avoid such a problem, the arm 11a of the lock lever will be pushed and unlocked before the bent part 16a rides on the side edge of the shutter 7, causing further folding. The pressing force of the curved portion 16a opens the shutter 7 at a position before the opening of the shutter 7, exposing the magnetic disk l.

If the magnetic disk cassette is ejected in such a state, the shutter will not close and the magnetic disk cassette will be ejected, which will not function as a shutter and cause damage to the magnetic disk.

[Means for Solving the Problems] In order to solve the above-mentioned problems, in the present invention, the shutter closing member is made of an elastic member, the force acting on the locking means of the elastic member is small, and the engagement force on the shutter is small. A bent structure was adopted to increase the resultant force.

[Function] When the above-described structure is adopted, the closing member is not elastically deformed in the unlocking direction even if it comes into contact with the locking means during the opening operation of the shutter, and the shank does not open prematurely.

Moreover, since the engagement force of the closing member with respect to the shutter is large, even when the sliding load of the shutter is large, the closing member does not come off from the shutter and can be closed reliably.

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

1 and 2 illustrate one embodiment of the present invention. In the figures, the same or corresponding parts as in FIGS. 3 to 5 are denoted by the same reference numerals, and the explanation thereof will be omitted.

On the wood flow side, a closing member 17 is provided on the magnetic disk device side to perform the same function as the closing lever 16.

Note that the opening claw 15 of the shutter is omitted because it has the same structure as the conventional structure.

The closing member 17 is constructed as shown in FIG. 2(A).

That is, the closing member 17 is made of steel wire or the like, and is bent into a substantially V-shape as a whole.

That is, the closing member 17 has arms 18a and 18b bent to form both sides of a triangle, and a vertical side 18c is formed continuously at the tip of the arm 18b in a vertical downward direction.

A closing arm 18d extends from the lower end of this vertical side 18c toward the left in FIG. 2(A), and a bent portion 18e is formed at the tip of this closing arm 18cl toward the cassette side. has been done.

The end of the arm 18a is bent and engaged with a support 21 protruding from the magnetic disk device side.
The apex of arm 18b is wrapped around the outside of support 20, and the free end side of arm 18b is in contact with support 19 via contact portion 22.

The arms 18a and 18b are urged in the direction of opening each other.

Note that the pillars 19 to 21 have their lower ends facing above the magnetic disk to be loaded, and do not come into contact with the magnetic disk cassette.

Further, the closing arm 18d and the bent portion 18e are in the same horizontal plane, and the closing IL arm 18d is attached to the cassette! - Extends to the side and is in a position where it can be fitted into the groove 8 formed on the side edge.

Further, the spring force of the arm 18b is set smaller than the torsion force of the front right side 18e.

Incidentally, the biasing force in one direction in the figure may be strengthened by forming a torsion coil spring portion 18f in the middle of the free right side 18c as shown in FIG. 2(B).

Next, we will discuss the operation of this embodiment configured as described above.
〔explain.

Before the magnetic disk cassette 2 is installed, the chanter is closed and the claw 7b is engaged by the lock lever 11, so that it is in a locked state.

In this state 1n1, the magnetic disk cassette 2 is installed as shown in the direction of arrow C in FIG.

At this time, since the lower ends of each of the pillars 19 to 21 are in a position where they do not touch the second surface of the magnetic disk cassette 2, the problem of (a disk cassette, l-2) does not occur.

When the magnetic disfusator is installed γi, the bent portion 18e is first fitted into the groove 8.

Then, the bent portion 18e locks...the arm 11 of Ku-11.
The proximal end of the arm 18b is pressed, but at this time, the contact portion 22 of the arm 18b with the support 19 touches the support 19, as shown by the chain line in FIG.
However, the arm 11a of the lock lever is not pushed up by bending in the direction of the arrow in Fig. 1.

Therefore, the shutter 7 is kept locked.

Then, as the magnetic dispersion center 2 advances, the bent portion 18e rides on the outer edge of the shutter 7, and eventually 1
It fits into the opening part 7a.

In parallel with the above-mentioned operation, the opening claw 15 approaches the lock lever 11 in the same manner as in the conventional structure shown in FIG. 5, and eventually pushes the base end of the arm 11a, separating the hook 11c from the claw 7b.

In this state jB, the listening claw 15 is further attached to the tip edge 7C of the shank 7.
In order to hold the shutter 7 in that position, the shutter opens as the magnetic disk center 2 moves in the direction of arrow C, and the magnetic disk is exposed through the opening 6.

Magnetic recording and reproduction are performed in this state.

On the other hand, when the magnetic disk cassette 2 is ejected, the following operation occurs.

That is, when the magnetic disfusator 2 is ejected in the direction opposite to the arrow C, the bent portion 18e comes into contact with the side edge of the opening 7a,
In order to push this, the arm 18b is applied with the support 20 as a fulcrum via the closing arm 18d, and is given a force to open in the direction of the arrow. Therefore, the opening cannot be opened in the direction of the arrow, and even if the sliding load of the shutter 7 is large, the engagement between the bent portion 18e and the edge of the opening 7a will not be released.

Therefore, the pa/yatta 7 is held in its position, only the magnetic disk cassettes 1 and 2 are ejected, and the chanterf is closed.

When the claws 7b and ILc are engaged, the shutter 7 is locked and cannot be moved further, so that all the ejection force applied to the magnetic disk cassette 2 is released. Concentrate on the curved portion 18e.

However, as described above, since the arm 18b is prevented from opening by the support 19, the closed arm 18d overcomes the twisting force of the front right side 18c in the direction of arrow 1 and is forced to rotate in the direction of arrow J. Moved.

The bent portion 18e comes out of the open section 7a, rides on the outer edge of the chanterf, and leaves the chanterfe.

As the above-mentioned operation progresses, the opening pawl 15 shown in FIG. 5 separates from the lock lever 11.

As described above, this embodiment is equipped with a closing member that can apply a weak spring force to the lock lever when the shank is opened, and a strong spring force to the shank when the shutter is closed. Even with a structure where the sliding load is large and the spring force of the long lever is small, the
The opening and closing operations of the ivy can be performed reliably.

Note that the magnetic disc cassette is normally installed along the cassette kite provided on the ζ1 side, and when the magnetic disc cassent reaches its installation limit, the cassette guide automatically descends and the magnetic disc cassette is removed. An operation is performed to position it at a predetermined position.

At this time, the magnetic disk cassette is pressed to a predetermined position by a suppressor or the like (not shown), a so-called overcharging operation occurs, and the magnetic disk cassette is displaced within the cassette guide.

However, in this embodiment, since the closing member is made of steel wire or the like, it can be sufficiently displaced in the vertical direction in FIG. 2, and can follow the movement of the cassette during overcharging. without damaging the cassette or closing member.

In the above-mentioned embodiment, the structure in which the closing member 17 was formed entirely by bending steel wire was adopted, but it could also be constructed by combining the leaf spring and the steel wire, or by bending or twisting only the leaf spring. It's okay.

[Effects of the Invention] As is clear from the following description, according to the present invention, the shutter closing member is made of an elastic member, the force acting on the locking means of the shutter is small, and the shutter is engaged with the opening portion of the shutter. Since the engaging force is configured to be large, reliable opening and closing can be performed even for a disk cassette in which the sliding load of the shutter is large and the spring force of the locking member is small.

[Brief explanation of drawings]

Figures 1 and 2 illustrate one embodiment of the present invention.
FIG. 1 is an explanatory diagram for explaining the opening and closing operation of the shutter, FIG. 2 (A) is a perspective view for explaining one example of the closing member, and FIG.
) are perspective views illustrating other structural examples of the closing member, and FIGS.
5 illustrates the conventional structure, FIG. 3 is a perspective view of the magnetic disk cassette, FIG. 4 is a plan view of the magnetic disk cassette with the upper cassette half removed, and FIG.
The figure is an explanatory diagram of the opening/closing operation of the shutter. l...Magnetic disk 2...Magnetic disk center 7...Shutter 7a...Opening 7b...
Claw 11...Lock lever 15...Opening claw 17...Closing member 18a, 18b...
Arm 18c... Vertical side 18d... Closing arm 18
e...Bending portion patent applicant Canon Co., Ltd. 1.
−〇−5 Agent Patent Attorney Takashi Kato ・Second
Figure (A) Figure 2 (B)

Claims (1)

[Claims] In a disk recording or reproducing apparatus using a disk cassette having a shutter that can be opened and closed and a locking means for locking the shutter in a closed position, the shutter closing member is made of an elastic member, and the elastic member acts on the locking means. A shutter opening/closing mechanism for a disk cassette, characterized in that the shutter opening/closing mechanism for a disk cassette is bent so that the force is small and the engagement force with respect to the shutter is large.