JPH0743859B2 - Opening / closing device for cassette lid - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an opening / closing device for a cassette lid such as a cassette type tape recorder.

2. Description of the Related Art A conventional cassette lid opening / closing device has a structure as shown in FIG. That is, reference numeral 1 is a cassette lid having an insertion opening 2 into which a tape cassette is inserted on the front side surface, and is attached to the apparatus main body 4 so as to be rotatable around a rotation fulcrum 3. Further, the cassette lid 1 is constantly biased by the spring 6 in the A direction in order to facilitate the opening operation. As shown in FIG. 5, the spring 6 is attached by inserting and fixing one end of the cassette lid spring 6 made of a wire into the boss 5 provided in the apparatus body 4, and the other end of the cassette lid spring 6 is provided on the cassette lid 1. The ribs 8 are slidably engaged with the ribs 8 and the intermediate portions of the cassette lid springs 6 are engaged with the ribs 7 provided on the apparatus main body 4 to bend the cassette lid springs 6 to bend the cassette lid 1 A rotational urging force in the direction of arrow A is applied to. When the cassette lid 1 is closed, the cassette lid spring 6 is further bent as the cassette lid 1 rotates in the direction of arrow B, and the rotational biasing force is increased.

Incidentally, in FIG. 6, 11 is a tape cassette loaded in the cassette lid, and the tape holding spring 9 provided on the inner surface of the cassette lid 1a causes the lower surface 1b (see FIG. 4) of the insertion slot 2 to be attached. Pressed. Further, 10 is a spring provided on the apparatus main body 4 side so as to contact the front surface of the tape cassette 11 when the cassette lid is closed and to regulate the position of the tape cassette 11 in the front-rear direction.

However, in the case of such a structure, as shown in FIG. 6, when the cassette lid 1 is in the closed state (the cassette lid is shown as 1a in FIG. 6) is a standard. As a result, the opening force of the cassette lid with respect to the opening angle θ of the cassette lid 1 (rotational biasing force of the cassette lid spring 6) has the characteristics shown in FIG.

Therefore, when the holding force of the tape pressing spring 9 in the cassette tape loading state shown in FIG. 6 is f, the opening force F of the cassette lid 1a must be at least f or more.
Considering 1.5, an opening force of F = 1.5f is required. Therefore, the spring load in the state where the cassette lid is fully opened (the state shown in the cassette lid 1 in FIG. 6) also increases, and the legs of the cassette lid are damaged by repeated opening and closing of the cassette lid,
There is a drawback that the amplitude movement of the cassette lid is large before the cassette lid is stopped when the cassette lid is opened. Therefore, the present invention holds a predetermined spring load in a state where the cassette lid starts to open, and reduces it when the cassette lid is fully opened.

Means for Solving the Problems In order to solve the above problems, the cassette lid opening / closing device of the present invention rotates the device body between a first position in a closed state and a second position in an open state. A cassette lid is movably provided, and an end portion of a spring having an inflection fulcrum on an apparatus body is slidably engaged with a first engaging rib provided on the cassette lid, and the cassette lid is attached by the spring. When the cassette lid is positioned in the vicinity of the first position on the cassette lid closer to the inflection fulcrum than the first engagement rib, the cassette lid is urged to rotate in the direction of the second position. A second engaging rib is provided that abuts on the spring and separates when positioned near the second position.

Action According to the above structure, the action point of the cassette lid spring is set to a portion close to the fulcrum when the cassette lid starts to open, the spring load increases, and the action point of the cassette lid spring when the cassette lid is fully opened. Is set in the part far from the fulcrum, and the spring load becomes small. As a result, the opening force F'of the cassette lid when the cassette lid is fully opened is smaller than that of the conventional device, and there is a problem that the cassette lid is damaged when the cassette lid is opened or closed and the amplitude motion until the cassette lid is stopped is large. This can be solved without reducing the opening force F of the cassette lid when the opening of the cassette lid is started.

Embodiment One embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a perspective view of an essential part showing a state where the cassette lid starts to open. The above-mentioned conventional components are designated by the same reference numerals, and the difference from the conventional configuration is that another rib is provided in the vicinity of the rib 8. 12 is provided, and the cassette lid spring 6 is engaged with the rib 8 via the rib 12. The cassette lid spring 6 is in contact with the rib 12 in the vicinity of the closed state of the cassette lid, and is separated from the rib 12 in the opened state. In the above structure, in the vicinity of the closed state of the cassette lid 1, the rib 12 serves as a sliding portion, that is, an action point of the cassette lid spring 6, as shown in FIG. Is added to. On the other hand, in FIG. 2 showing the state where the cassette lid 1 is fully opened, the rib 8 of the cassette lid 1 serves as a sliding portion of the cassette lid spring 6, that is, an action point. As a result, the action point of the cassette lid spring 6 is switched in two steps, and the opening force of the cassette lid can be set in two steps as shown in FIG.

And, for example, in the conventional device, the opening force F of the cassette lid is 1450 g
Whereas it was cm, the wire diameter was φ1.2 mm in the device of this example.
The same opening force can be realized with the above, and by reducing the wire diameter, the opening force F'of the cassette lid when the cassette lid is fully opened is 670g · c in the conventional device (using wire diameter φ1.5mm).
What was m becomes 280 gcm.

As a result, it is possible to solve the problems that the cassette lid is damaged and that the amplitude movement is large until the cassette lid is stopped.

EFFECTS OF THE INVENTION According to the present invention, since the sliding portion of the cassette lid spring is provided at two or more places and the spring load is changed in two or more steps, the foot portion of the cassette lid may be damaged or the cassette lid may be repeatedly used. It is possible to solve the problem that the amplitude movement of the cassette lid is large before the cassette lid is stopped when the lid is opened.

[Brief description of drawings]

FIG. 1 is an enlarged perspective view of an essential part of a cassette lid opening / closing device according to an embodiment of the present invention, FIG. 2 is an enlarged perspective view of an essential part of the device in other operating states, and FIG. FIG. 4 is a perspective view of a conventional cassette lid opening / closing device, and FIG. 5 is a perspective view of the relevant part.
FIG. 6 is a side view showing the operation of the cassette lid opening / closing device, and FIG. 7 is an operation characteristic diagram thereof. 1 ... Cassette lid, 3 ... Rotation fulcrum, 4 ... Device body,
6 ... Cassette lid spring, 7,8,9 ... rib.

Claims (1)

[Claims] 1. An apparatus main body is provided with a cassette lid rotatably between a first position in a closed state and a second position in an open state, and a spring having an inflection fulcrum on the apparatus main body. One end of the cassette lid is slidably engaged with a first engaging rib provided on the cassette lid, and the spring biases the cassette lid toward the second position, and the first lid is slidably engaged with the first lid. When the cassette lid is located near the first position on the cassette lid closer to the inflection point than the engaging rib, the cassette lid comes into contact with the spring, and when the cassette lid is located near the second position, An opening / closing device for a cassette lid, characterized in that a second engaging rib that separates is provided.