JPS61248274A - Disk cassette - Google Patents

Abstract

PURPOSE:To prevent a disk cassette from being easily inserted by a rod or a finger and also from the entry of dust due to a state being left as it is for a long period by constituting a shutter so as to be energized by an elastic body in a direction to always close a head loading window and so as to be locked under the closed state of the head loading window. CONSTITUTION:In accordance with the loading of a disk cassette, a projection 25 slides on the inside of a guide groove 14, pushes and bends the back part of a lock claw 6 and disengages the engagement of a recessed part 7 of the lock claw 6 with the 1st stopper 3 of the shutter 2. When the disk cassette is loaded moreover, a head loading hole 8 is started to be opened. To unload the disk cassette from a driving device, a cassette holder 24 is lifted and positioning pins 15, 16 are disengaged from the disk cassette. Consequently, the disk cassette is extruded from the inside of the cassette holder 24 by the reaction force of a twisted coil spring 5 formed on the inside of a shell, and simultaneously the shutter 2 closes the head loading hole 8.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a disk cassette containing a flexible magnetic disk, and more particularly to a disk cassette having an automatic shutter suitable for protection against wind and fingers.

[Background of the invention]

The conventional disk cassette is Utility Model 59-138062.
As described in the issue, a head insertion window is formed in a case containing a flexible magnetic disk, and a shutter is installed on one side of the case to open the head insertion window when in use and close the window when not in use. A stopper is slidably attached to the case, and is engageably engaged with an engagement hole formed in the shutter at a side portion thereof, and a stopper formed in the shutter when engaged with the retaining hole. forming a locking claw that is prevented from moving in the direction of releasing the locking by contacting with the locking claw,
The lock claw has a first cam portion that displaces the lock claw in the direction of releasing the contact with the stopper by contacting the release member during use, and then the direction of releasing the lock claw with the locking hole. It had a shutter lock mechanism formed with a second cam portion for displacing the shutter. With this type of shutter lock mechanism, if you press the lock claw with a sharp object such as a pencil or ballpoint pen, or your fingernail, the lock with the shutter will be released, the shutter will be free to move, and the disc cassette will be released. The drawback was that the head insertion window remained open even when the drive was not loaded. In addition, the locking pawl wears out significantly due to sliding with the stopper, and becomes unable to maintain its hold during repeated engagement, making it impossible for the shutter to close the head insertion window and causing the head insertion window to remain open. It may happen.

In addition, in the case containing the 7 lexiple magnetic disk,
A shutter is slidably attached to one side of the case to open the head insertion window when in use and close the head insertion window when not in use, and one end is locked to the shutter and the other end There is a disk cassette in which a spring fixed to the case is arranged so as to bias the shutter in a direction in which the head insertion window is always closed. This conventional disc cassette is shaped like a shutter U-shape,
Since the case is held from the outside, it is possible to slide the shutter by directly holding it with your fingers. Therefore, the head insertion window is easily opened. The open head insertion window has the disadvantage that fingers, pencils, and sticks can get into each station, easily damaging the valuable magnetic disk.

[Purpose of the invention]

The purpose of the present invention is to eliminate the above-mentioned drawbacks of the prior art, and to enable the magnetic disk to be safely stored and used, the head insertion window opens only after it is attached to the main body, and the head insertion window opens smoothly when removed from the main body. An object of the present invention is to provide a disk cassette having a shutter opening/closing mechanism for closing a head insertion window.

[Summary of the invention]

In order to achieve the above object, a shutter structure is adopted in which the shutter is always biased by an elastic body in the direction of closing the head insertion window, and furthermore, the shutter is locked with the head insertion window closed. Example] Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 1(a) and 2(b) and FIG. In this embodiment, a flexible magnetic disk 9 is rotatably inserted inside a shell 1. , a shutter 2, a torsion coil spring 5, and a lock claw 6. The shell 1 consists of an upper shell 1a and a lower shell 1b, and both shells are fixed at their peripheries by ultrasonic welding or a bonding agent. The shell 1 has positioning holes 15 and 16 perpendicular to the plane of the paper for positioning the shell 1 within the drive device when the shell 1 is inserted into the drive device (not shown). Further, a hub drive hole 26 is located approximately in the center, and a head insertion hole 8 is formed vertically to the plane of the paper, penetrating the upper and lower shells la and lb. Furthermore, a counter 13 is provided inside the shell 1 to display the number of recorded tracks. The flexible magnetic disk 9 is a flexible disk made of polyethylene terephthalate with a thickness of about 5-0 μm and an outer diameter of 47 mm, with a magnetic material coated on the surface.
A hub 10 having a non-circular central opening 11 is fixed to its center. On the flexible magnetic disk 9,
Magnetic tracks having a width of about 60 μm and a pitch of 100 μm are arranged and recorded at equal intervals between 15 mm and 20 mm in radius. A field image is recorded on one track, and two tracks form one frame. Therefore, 25 frames are recorded on the −1 7-lexiple magnetic disk 9. The counter 13 indicates this number, and the notch 27 indicates the number of recorded tracks. counter 1
3 is a gear 28, a gear stopper 23, and a gear stopper 23
It consists of a press rod 22 that presses the press rod 22 with its teeth, and a leaf spring 21 that urges the press rod 22 downward. These counter mechanisms are located inside the shell. The shutter 2 is made by bending a stainless steel plate approximately 0.2 mm thick into a U-shape, straddles the shell 1 in steps, and slides on a shutter slide portion 12.

As shown in FIG. 3, the shutter 2 has a U-shaped guide protrusion 30 projecting inward, and a pull-out stop 31 bent inward in the U-shape.
A protrusion 30 and a retainer 31 fit into a guide groove 29 provided in the shell 1b to prevent the shutter 2 from coming off the shell 1 and at the same time provide smooth sliding. A first stopper 3 and a second stopper 4 are formed on the back of the shutter 2 by bending them toward the inside of the shutter 2. Both the first stopper 3 and the second stopper 4 are formed in the guide groove 1 formed on the end surface of the shell 1.
A first stopper 3 that protrudes from the shell 1 and does not come into contact with the shell 1 engages with a knob 7 of a lock claw 6 inserted inside the shell 1. The lock claw 6 is made entirely of plastic,
One end is non-rotatably supported by the shell 1 at two points, the other end is a free end, has a recess 7 at the end, and the free end has elasticity.
Bends due to external force. When the shutter 2 slides through the head insertion hole 8 to the cover 5 position, the first stopper 3 of the shutter 2 gets stuck in the recess 7 and cannot be removed. Therefore, the shutter 2 is fixed at a position covering the head insertion hole 8. The second stopper 4 of the shutter 2 engages with one end 17 of the torsion coil spring 5, and the other end 18 of the torsion coil spring 5 is inserted into the i-shaped #s19 of the shell 1 and abuts against the wall. The torsion coil spring 5 is made of a spring wire with a diameter of 0.5 mm, with two turns of coil formed in the center thereof, and both ends 17 and 18 bent at 90 degrees in the same direction as the axial direction of the coil. There is. The torsion coil spring 5 is inserted inside the shell l, and as described above, the end 18 is rotatably supported by the groove 19, and the other end 17 is in contact with the second stopper 4 of the shutter 2 and rotatably supported. The torsion coil portion of the middle shaft shown in FIG. 1 is in an unsupported state. The torsion coil spring 5 is bent and inserted into the shell 1, urges the shutter 2, and slides until the end of the shutter 2 abuts against the bank 33 of the shutter slide section and stops. Shutter 2
With the end of the shutter 2 in contact with the bank 33, the shutter 2 completely covers the head insertion hole 8.Next, the opening/closing operation of the shutter 2 will be explained with reference to FIGS. 4 and 5. FIG. 4 shows the disc cassette being inserted into the cassette holder 24 of the drive device. The protrusion 25 of the cassette holder 24 slides inside the guide groove 14 as the disc cassette fixed to the cassette holder 24 is inserted. First, push the back of the lock claw 6 to bend the lock claw 6 to release the engagement between the recess 7 of the lock claw 6 and the first stopper 3 of the shutter 2. Next, the protrusion 25 of the shutter 2 and stops the movement of the shutter 2. If you insert more disk cassettes,
The disk cassette receives a reaction force from the torsion coil spring 50, and receives a force in a direction opposite to the insertion direction of the disk cassette. When the disk cassette is inserted against the reaction force of the torsion coil spring 50, the disk cassette is inserted because the shutter 2 is stopped, and the head insertion hole 8 begins to open as a relative movement. At this time, the torsion coil spring 5 begins to bend, and the central torsion coil portion moves in an arc in the direction of the arrow. FIG. 5 shows the disk cassette completely inserted into the cassette holder 24. At this time, the shutter 2 slides on the shutter slide part 12 of the shell by the protrusion 25, the shutter 2 moves close to the other bank 340 of the shutter slide part, the torsion coil spring 5 is deflected to the maximum, and the shutter head The insertion hole 8 is completely opened. In the drive device, two positioning pins 35 and 36 stand independently of the cassette holder 24, and are inserted and engaged with the positioning holes 15 and 16 of the disk cassette. The cassette holder 24 is configured to be able to move up and down (not shown) within the drive device, and when the disk cassette is fully inserted into the cassette holder 24, it is lowered and the positioning holes 15 and 16 and the positioning bin 2 are moved.
0 and 32 mate, and the disk cassette is positioned within the drive device.

To eject the disk cassette from the drive device, first the cassette holder 24 is raised and the positioning bins 15 and 16 are disengaged from the disk cassette. Then, the disc cassette is pushed out of the cassette holder 24 by the reaction force of the torsion coil spring 5 provided inside the shell 1, and at the same time the shutter 2 closes the head insertion hole 8. When the disk cassette is removed from the drive device, the first stopper of the shutter 2 engages with the recess 7 of the lock pawl 6 to lock the movement of the shutter 2.

〔Effect of the invention〕

According to the present invention, a disk cassette having a shutter disposed on the outside of the shell includes a shutter locking mechanism;
Since the shutter's head insertion hole closing force is also used by the torsion coil spring placed inside the shell, the shutter does not open easily and the probability of accidentally opening the shutter is low, and it is easy to use with a stick or finger. At the same time as preventing insertion, even if the shutter opens, it is always biased in the closing direction by the torsion coil spring, so the head insertion hole will never be left open, preventing dust from entering if left unused for a long time. It can be prevented.

[Brief explanation of drawings]

FIG. 1(a) is a top view of an embodiment of the present invention, FIG. 1(b)
is a front view of an embodiment of the present invention, FIG. 2 is an exploded configuration diagram of an embodiment of the present invention, FIG. 3 is a back view of an embodiment of the present invention, and FIGS. 4 and 5 are an embodiment of the present invention. FIG. Description of symbols I11@1111I+Shell, 2-----Shatter, 3 mmmmmm First stopper, 4 mmmmmm
Second stopper, 5... Torsion coil spring, 5
mm5m5 Lock claw, 8...Head insertion hole, 9
61+111 flexible magnetic disk, 14-・Guide groove, 15.16...Positioning groove, 24...
・Cassette holder, 25・Curved protrusion. 11 times s 2 Figure 3 Figure 40 Figure 5

Claims (1)

[Claims] A disk cassette comprising a cassette formed by combining an upper shell and a lower shell made of synthetic resin and having a head insertion window and a drive shaft insertion hole formed therein, and a disk rotatably housed in the cassette, It has a U-shaped cross section and slides while holding the cassette between its upper and lower plate surfaces, and has a first state in which the head insertion window is covered when not in use, and a second state in which the head insertion window is exposed in use. a guide groove provided in the cassette so as to extend in the sliding direction of the shutter along the side of the cassette;
a first stopper that is bent in the direction of the guide groove and protrudes into the guide groove; a lock claw that is disposed within the cassette and protrudes into the guide groove to abut and engage with the stopper; one end is rotatably engaged with the cassette, and the other end is disposed in one of the shutters.
and a torsion coil spring rotatably engaged with a second stopper formed by bending a portion toward the guide groove, and when not in use, the torsion coil spring biases the shutter and closes the head insertion window. , and the first stopper engages with the lock pawl to prevent movement of the shutter.