JPH0119251Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a cassette door opening/closing device for a video cassette for a video tape recorder, that is, a cassette having a cassette door provided for protecting the built-in magnetic tape. be.

As shown in FIG. 1, a conventional cassette door opening/closing device of this type includes a door guide 3 made of a suitably shaped metal plate on the video tape recorder side in order to open and close the cassette door 2 of the cassette 1. The cassette door 2 is opened and closed by locking and releasing the door guide 3 and the cassette door 2 using the vertical movement when the cassette 1 is installed.

However, if the insertion height of the cassette 1 into the video tape recorder is sufficiently high relative to the door guide 3, there will be no problem. If the height with the door guide 3 is not sufficient and the cassette door 2 is to be opened completely, the door guide 3 should be formed with a protrusion 4 as shown in Fig. 2, so that the cassette 1 can be lowered when the cassette is installed. Accordingly, the cassette door 2 is made to climb onto this convex portion 4 to open the necessary amount.

At this time, the cassette 1 receives a large reaction force in the direction of the arrow A, which has the disadvantage that it is difficult to return and correctly mount the cassette in the video tape recorder.

The purpose of this invention is to eliminate the above-mentioned drawbacks of the conventional method and to enable the cassette door to be opened and closed without difficulty. .

This cassette door opening/closing device has a cassette door receiving arm 10 extending substantially horizontally, a locking arm 11 extending downward substantially at right angles to this arm, and an upper cam 13 rotatable about a shaft 12. The upper cam 13 has a spring 14 which urges the cassette door receiving arm 10 to rotate downward.
is fixed. Furthermore, the above upper cam 13
It has a cassette vertical motion receiving arm 15 extending downward substantially horizontally and an operating arm 16 extending upward substantially at right angles to the cassette vertical motion receiving arm 15 which comes into contact with the locking arm 11 of the upper cam 13, and is rotated by a shaft 17. A freely movable lower cam 18 is disposed, and the lower cam 1
A stopper 19 is provided above the cassette vertical motion receiving arm 15 of No. 8, and by this stopper 19,
The lower part tries to rotate in the opposite direction to the rotational direction of the upper cam 13 due to the force of the spring 14 transmitted through the contact point between the locking arm 11 of the upper cam 13 and the operating arm 16 of the lower cam 18. It is designed to receive the cam 18.

With this configuration, the upper cam 1
3 and the lower cam 18 are the above-mentioned locking arm 11 and operating arm 1.
6 allows mutual rotation to be transmitted, and the spring 14 and stopper 19 allow the upper cam 13 and lower cam 18 to interlock with each other without play.

Insert cassette 1 into the video tape recorder,
When the cassette 1 begins to descend, the cassette vertical movement receiving arm 15 is pushed down, and the lower cam 18 rotates about the shaft 17 in the counterclockwise direction in the figure. Therefore, this rotation causes the actuating arm 16 to
pushes the locking arm 11 of the upper cam 13 forward against the elasticity of the spring 14, so that the upper cam 13 is rotated clockwise in the figure about the shaft 12.

Therefore, this rotation moves the cassette receiving arm 10 upward, so that the cassette receiving arm 1
0 lifts the cassette door 2 of the cassette 1 upward and opens it.

When taking out the cassette 1, the above is reversed; when the cassette 1 starts to rise, the upper cam 13 and the lower cam 18 operate in the opposite manner as described above, and the cassette door 2 is opened by the force of the spring 14 provided on itself. It can be closed by

This invention has the above-mentioned structure, so the cassette door of the cassette can be opened and closed with ease, and reliability is improved, making it particularly suitable for float loading systems. .

[Brief explanation of the drawing]

1 and 2 are side views showing a conventional cassette door opening/closing device, FIG. 3 is a side view showing an embodiment of the cassette door opening/closing device of this invention, and FIG. 4 is a perspective view thereof. . 1...cassette, 2...cassette door, 10...
...Cassette door receiving arm, 11...Latching arm, 13...
...Upper cam, 14...Spring, 15...Cassette vertical motion receiving arm, 16...Operating arm, 18...Lower cam, 19...Stopper.

Claims (1)

[Scope of utility model registration request] A rotatable upper cam having a cassette door receiving arm extending substantially horizontally and a locking arm extending downward at substantially right angles to the arm is disposed, and the upper cam is configured to rotate the cassette door receiving arm downward. A cassette vertical motion receiving arm extends substantially horizontally below the upper cam, and extends upward substantially at right angles to the cassette vertical motion receiving arm that contacts the locking arm of the upper cam. A rotatable lower cam having an operating arm is disposed, and a stopper is provided above the cassette vertical motion receiving arm of the lower cam, and a stopper is provided above the cassette vertical motion receiving arm of the lower cam, and the stopper is provided at the contact point between the locking arm of the upper cam and the operating arm of the lower cam. A cassette door opening/closing device in which the stopper receives the lower cam which is about to rotate in a direction opposite to the rotational direction of the upper cam due to the force of the spring transmitted by the cassette door.