JPH0244386Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a mechanism for preventing a cassette from flying out when the cassette is ejected.

[Prior art]

Conventionally, in a magnetic disk device in which a magnetic disk is rotatably housed in a cassette, a cassette 2 is inserted into the magnetic disk device as shown in FIGS. The cassette ejection spring 12, the leaf spring 14 that presses the cassette, and the biasing spring 10 that moves the cassette holder 4 between the recording/playback position and the insertion/ejection position are loaded, and the eject button 1 is pressed.
When the cassette 2 is ejected by the pushing operation in step 3, the ejection spring 12 is moved under the influence of the spring 10.
The cassette is ejected by the closing spring of the shutter plate, and is braked by the cassette holding plate spring 14 to prevent it from popping out.

However, since the thickness of the cassette 2 varies, the braking effect of the cassette retaining plate spring 14 is greatly affected by the thickness, and the cassette may fly out of the magnetic disk device when ejecting. In addition, since the cassette presser plate spring 14 is in pressure contact with the cassette 2, the pushing resistance of the cassette is large and the cassette is easily scratched.As a result, the amount of cassette ejected gradually changes as the coefficient of friction changes, making it difficult to use multiple magnetic disk devices. When the cassettes are used side by side, there is an unsightly disadvantage if the discharge amount of each cassette is different.

Furthermore, a sixth
As shown in Fig. 7, an elastic material 15 such as moltoprene
is fixed so that the elastic member 15 faces the inclined surface 4c provided upward in the cassette insertion opening of the cassette holder 4, and when the cassette is inserted, the door 3 is rotated backward on the top surface of the cassette, and the cassette moves forward when the cassette is ejected. A cassette protrusion prevention mechanism has also been proposed in which the door 3 is pressed against the upper surface of the cassette 2 via the elastic material 15 on the inclined surface of the holder 4, but if the elastic material 15 such as moltoprene is used for ejection control as described above, It has the disadvantage of large changes over time. Further, there are drawbacks such as the amount of ejection changes due to the difference in the posture of the magnetic disk device, and it is difficult to maintain a mechanical balance to control the amount of ejection.

[Purpose of invention]

In view of the above-mentioned drawbacks, the present invention has a simple configuration in which the door is pressed against the cassette by a spring member provided on the holder, and a stable cassette ejection amount can be obtained, the mechanical mechanism is easily balanced, and the cassette has little change over time. The purpose of this project is to propose a mechanism to prevent the robot from flying out.

[Structure of the idea]

The present invention includes a holder movably provided to house a cassette and transport the cassette between an insertion/ejection position and a recording/playback position, and a holder that blocks an insertion opening for inserting the cassette into the holder. A door provided on the holder and rotatably provided on the holder side, and a spring member provided on the holder that presses the door against the cassette when the holder moves to an insertion/ejection position. It is about becoming.

〔Example〕

Hereinafter, the present invention will be explained with reference to an illustrated embodiment. The cassette ejection prevention mechanism is described in terms of a magnetic disk device in which a magnetic disk is housed in a cassette.
In Fig. 2, an insertion slot 1a for a cassette 2 is drilled in the front case 1, and a door 3 is placed on the rear side of the holder 4 on the back side of the front case 1 above the insertion slot 1a.
It is rotatably installed on the side.

A plurality of rollers 5 are rotatably supported on both sides of the holder 4 and are inserted into the inverted L-shaped guide grooves 6a of the side plates 6, 6, and the cam surface of the eject plate 7 is brought into contact with the holder 4. When the cassette 2 is inserted and pushed into the cassette 4, it is biased downward by a spring 10 to the recording/reproducing position, and when raised by the eject plate 7, it is biased by the spring 10 to advance to the cassette insertion/ejection position. has been done.

A spring member 8 is fixed to the upper surface of the holder 4, and the free ends 8a, 8a of the spring member 8 come into contact with the door 3 when the holder 4 is moved to the cassette insertion/ejection position, and pull the lower end 3a of the door 3 into the cassette 2. It is placed so as to press against the top surface of the An arc-shaped elongated hole 4b is formed on the rear upper surface of the holder 4, into which a pin 9a of a cassette ejection lever 9 is inserted, and the cassette ejection lever 9 is rotatably supported on the holder 4 by a shaft 11 and ejected. A spring 12 biases the pin 9a against the rear side of the cassette 2 to eject it.

A magnetic disk (not shown) is accommodated in the cassette 2, and the cassette 2 has a hole (not shown) into which a recording/reproducing head (not shown) enters, and the hole is covered by a shutter plate except when necessary. There is. When the cassette 2 is inserted into the holder 4, this shutter plate engages a portion of the shutter plate with a protrusion (not shown) provided on the holder 4, and as the cassette moves during loading, the shutter plate is closed. The hole is opened and locked against a spring.

The cam surface of the eject plate 7 is formed by an inclined surface 7a and a horizontal surface 7b, and one side of the eject plate 7 protrudes outside from a hole bored in the lower side of the cassette insertion opening 1a of the front case 1. Button 13 is fixed.

When the cassette ejection prevention mechanism is configured as described above and the cassette 2 is loaded into the holder 4 at the insertion/ejection position shown in FIG. As the cassette 2 rotates, the cassette 2 is inserted into the holder 4, and when the cassette 2 is pushed further, the pin 9a of the cassette ejection lever 9 comes into contact with the rear side of the cassette 2, and the rear cassette ejection lever 9 moves backward. When the cassette 2 is further pushed into the retracted position, the holder 4 is retracted against the spring 10, and the roller 5 is dropped from the horizontal surface 6b of the inverted L-shaped guide groove 6a of the side plate 6 to the vertical part 6c, and the holder 4 is The forward movement toward the insertion port is stopped and the recording/reproducing position shown in FIG. 3 is reached.
The cassette 2 in which the holder 4 is in the state shown in FIG. The spindle is inserted.

Next, when the eject button 13 is pushed in as shown in FIG. Reverse L
When the cassette comes out of the vertical part 6c of the letter-shaped guide groove 6a and rides on the horizontal surface 6b, the roller 5 and holder 4 are raised as shown in FIG. be advanced.

At this time, as the holder 4 rises, the cassette 2 rises, and when the roller 5 rides on the horizontal surface 7b of the eject plate 7 from the inclined surface 7a and the horizontal surface 6b of the side plate 6, the holder 4 and the cassette 2 are moved forward almost simultaneously. The cassette 2 is pushed out by an ejection spring 12 that pushes the pin 9a of the cassette ejection lever 9 and a closing spring of a shutter plate (not shown). When the holder 4 is moved forward, the free end 8a of the spring member 8 hits the door 3 and rotates the door 3 counterclockwise, and the lower end 3a of the door 3 pushes the top surface of the cassette 2 and brakes the cassette 2 from popping out. is applied, and the discharge amount α of the cassette 2 is controlled to a constant amount.

When the cassette popping-out prevention mechanism is constructed as described above, when the free end 8a of the spring member 8 hits and pushes the door as the holder 4 moves forward, the lower end 3 of the door 3
Since a pushes down the top surface of the cassette 2 and applies a brake, the ejection of the cassette 2 is reliably braked and the discharge amount α is kept constant, regardless of variations in the thickness of the cassette 2 or the coefficient of friction. It is controlled, a stable discharge amount α is obtained with little change due to temperature and humidity, and it does not look unsightly even when multiple magnetic disk devices are used side by side. Moreover, the upper surface of the cassette 2 is connected to the lower end 3a of the door 3 and the conventional leaf spring 14.
Since it is not constantly pushed down, there is less damage. Furthermore, there is little change over time, no adjustment process is required, and if the spring 10 that urges the holder 4 toward the insertion slot 1a is strong, the braking force that causes the door 3 to come into contact with the top surface of the cassette 2 by the spring member 8 will be correspondingly strong. Since the cassette ejection amount α is controlled, it is easy to maintain a dynamic mechanical balance, and the biasing mechanism that presses the door 3 with the spring member 8 does not affect other equipment, and no difference in posture occurs.

In the above description, the cassette ejection prevention mechanism has been described in terms of a magnetic disk device, but it may also be implemented in a device that uses a relatively thin hard case, such as a tape recorder cassette.

[Effect of idea]

Since the present invention is constructed as described above, the loading of the cassette becomes lighter and there is less damage to the cassette, and even if the coefficient of friction, thickness, etc. are different, the ejection of the cassette is reliably braked, and there is little change over time. A stable ejection volume is obtained, so it does not look unsightly even when multiple holders are used side by side.If the spring that biases the holder toward the insertion slot side is strong, the braking force applied to the door by the spring member against the top of the cassette becomes stronger, and the cassette is ejected. Since the amount is controlled, it is possible to provide a mechanism for preventing the cassette from popping out, which has excellent practical effects such as easy mechanical balance.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a cross-sectional plan view of a main part of a cassette ejection prevention mechanism implemented in a magnetic disk device when a cassette is inserted or ejected, and FIG. 2 is a sectional plan view of the main part. Figure 3 is a cross-sectional side view of the main part with the cassette and holder loaded in the recording/playback position, Figure 4 is a cross-sectional side view of the main part in the ejected state, and Figures 5 and below show a conventional cassette ejection prevention. Figure 5 is a sectional plan view of the main part of the mechanism, Figure 6 is a solid line showing the cassette being inserted into the holder, and a sectional side view of the main part of the recording/reproducing device shown by the two-dot chain line, and Figure 7 is a cassette and holder inserted into the holder. FIG. 3 is a cross-sectional side view of a main part that changes from a solid line state loaded at a playback position to an ejected state shown by a two-dot chain line. 1...Front case, 1a...Insertion slot, 2...
...Cassette, 3...Door, 4...Holder, 8...
...Spring member.

Claims (1)

[Scope of utility model registration request] a holder movably provided to store a cassette and transport the cassette between an insertion/ejection position and a recording/reproducing position; a holder provided to block an insertion opening for inserting the cassette into the holder;
A door rotatably provided on the holder side,
Provided in the above holder, the above holder can be inserted and
A mechanism for preventing a cassette from popping out, comprising a spring member that presses the door against the cassette when the door is moved to an ejection position.