JPH0230862Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cover opening/closing device, and particularly to a cover opening/closing device that can be opened and closed automatically.

An example of application to a VTR audio headshield cover will be described below.

Figures 2 and 3 show an example of a conventional VTR audio headshield cover. However, FIG. 3 shows a sectional view taken along the line P-Q in FIG. 2. The outside of the audio head 2 fixed to the base 1 is wrapped by a first shield cover 3 made of permalloy, and the front side of the audio head 2 that comes into contact with the tape 4 is A second shield cover 5 that can be opened and closed is provided. Therefore, when loading the tape, it is necessary to manually open the shield cover 5, load the tape, and then manually close the shield cover 5 after loading. If a tape is loaded without opening the shield cover 5 and the tape is run in recording mode, not only will no audio signal be recorded on the tape, but there is a risk that the tape will be damaged.
Furthermore, if the cover is forgotten to be closed and the tape is run, there will be a problem that the S/N of the recorded (or reproduced) audio signal will be poor. This phenomenon often occurs and can significantly reduce the value of the recorded material, especially if you forget to close the shield cover when recording.
It had become one of the drawbacks.

In order to eliminate these drawbacks, the present invention provides a cover opening/closing device in which the cover is automatically opened when a tape is loaded, and the cover is automatically closed after the tape is loaded. Furthermore, it is an object of the present invention to provide a cover opening/closing device that can be opened and closed not only automatically but also manually and that can be constructed simply and inexpensively.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view of a cover opening/closing device according to the present invention, FIGS. 4, 5, and 6 are partial side views, and FIG. 7 is a partial sectional view taken along the XY line of FIG. 1.
The audio head shield cover 5 shields the audio head 2 in the same way as the shield cover 5 shown in FIG. 2 to prevent noise from entering when the audio head 2 shown in FIG. 3 records audio on the tape 4. It is something. When loading a tape, the shield cover 5 is generally opened and closed by hand. Below, the first
The operation of the cover opening/closing device of the present invention will be explained with reference to FIGS.

A worm 7 attached to the motor shaft 6 and a worm wheel 9 attached to the shaft 8, which is the rotating shaft of the shield cover, are engaged as shown in FIGS. By reversing the rotation, the worm 7 rotates and the worm wheel 9 rotates. Further, a pin 10 protrudes from the side surface of the worm wheel 9, as shown in FIGS. 1 and 4, and when the worm wheel 9 rotates, the pin 10 also rotates. Further, the shield cover 5 is provided with a groove as shown in FIGS.
9 is provided, and rotation of the worm wheel 9 causes the pin 10 to move within this groove. Then, the pin 10 collides with the end face of this groove 19,
When the worm wheel 9 rotates further, pin 1
0 presses the end face of the groove 19 and rotates the shield cover 5.

Further, as shown in FIG. 4, one side of the spring 11 is fixed to the audio base 12, and the other side is fixed to the shield cover 5. Here, for example, the worm wheel 9 rotates clockwise and the spring 1
The shield cover 5 is rotated by the force of pushing the end face of the groove 19 of the pin 10 until the center line of the shield cover 1 exceeds the rotational fulcrum A of the shield cover 5. After that, the shield cover 5 is rotated by the force of the spring 10. will open automatically. And the shield cover 5 is the stopper 17
It stops by. This state is shown in FIG. 5 by a dotted line.

On the other hand, when the motor shaft 6 completely opens the shield cover 5 according to the above-mentioned principle, the first sensor 14 is activated by the first light beam and section plate 13 integrated with the shield cover 5 shown in FIG. This is detected by cutting off the light, and the motor shaft 6 is immediately reversed. Further, when the pin 10 returns to the position shown in FIG. 5 by reversing the motor shaft 6, the second sensor 16 is activated by the second light shield plate 15 integrated with the shaft 8 shown in FIG.
This is detected by cutting off the light, and the rotation of the motor shaft 6 is stopped.

Further, when closing the open shield cover 5, the motor shaft 6 is rotated in the opposite direction to the direction when opening the closed shield cover 5, and the shield cover 5 is automatically closed based on the same principle as when opening described above. The shield cover 5 is then stopped by a stopper 18 shown in FIG.

When the pin 10 is in the position shown in Fig. 5, the pin 10 will not hit the end face of the groove 19 when closing the open shield cover 5 or opening the closed shield cover 5, so the shield cover can be removed by hand. 5 can be opened and closed.

As explained above, according to the present invention, the shield cover can be automatically opened and closed both before and after loading the tape. Therefore, do not load the tape with the shield cover closed, or
Furthermore, the tape does not need to be run while it is open, and there is no need to open and close it by hand, which is very convenient. Furthermore, even though it opens and closes automatically, it can be opened and closed by hand as needed, such as while the tape is running.
It is very effective when used as a VTR audio headshield cover.

[Brief explanation of drawings]

Figure 1 is a front view of the present invention, Figure 2 is a front view of a conventional audio head shield cover, Figure 3 is a PQ sectional view of Figure 2, and Figures 4 to 7 are for explaining the present invention. 4 to 6 are partial side views, and FIG. 7 is a partial sectional view. 1...Base, 2...Audio head, 3...
First shield cover, 4...Tape, 5...Second shield cover, 6...Motor shaft, 7
... Worm, 8 ... Worm wheel shaft, 9 ... Worm wheel, 10 ... Pin, 1
1... Spring, 12... Audio bass, 13...
...First light beam and section, 14...First sensor, 1
5...Second light beam and section plate, 16...Second sensor, 17...First stopper, 18...Second stopper, 19...Groove.

Claims (1)

[Scope of utility model registration request] a cover configured to open and close by rotating a predetermined angle; a rotation shaft rotatable with respect to the cover provided on the rotation center of the cover; and a support member rotatably supporting the rotation shaft; A first gear fixed to the rotating shaft, a second gear that meshes with this gear, a motor that rotates this second gear, and a center line of the cover rotation when the cover is open and closed. a spring with one end hooked to the cover and the other end hooked to a fixed member so as to be on the opposite side of the fulcrum, a pin planted on either the first gear or the cover, and a pin on the other side of the cover; an engaging means consisting of a groove provided in an angular range that is approximately equal to the rotation angle for opening and closing; and detecting the open or closed state of the cover and reversing the motor to move the engaging means to a predetermined position. A cover opening/closing device comprising means for reversing and stopping one gear.