JPS6230235Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cassette lid opening/closing mechanism for a cassette tape recorder, and more particularly to a cassette lid opening/closing mechanism that can set the opening state of the lid in at least two stages.

The cassette lid that covers the tape cassette storage section of a cassette tape recorder is generally rotatably attached to the main body cabinet of the tape recorder, and is biased by a spring member in the direction of opening the lid, allowing the user to operate the lock release operation member, etc. The lid is configured to automatically open when the lid is unlocked. Such opening of the cassette lid is required during normal use in order to load or remove the tape cassette into the cassette storage section, and in this case, the lid must be opened to the extent that it does not interfere with the insertion and removal of the tape cassette. It is sufficient if the lid is opened and closed, and from the viewpoint of operability in opening and closing, it is preferable to set the rotation angle for opening and closing the lid to be relatively narrow (for example, about 30° to 60°). On the other hand, when cleaning the magnetic head or removing a tape wrapped around a pinch roller, for example, it is difficult to perform the work if the rotation angle of the lid is narrow when the lid is opened.

For this reason, conventional cassette lid opening/closing mechanisms use a structure in which the cassette lid itself can be removed, but the drawbacks remain that the cassette lid is troublesome to attach and detach, and the structure is complicated. are doing.

The present invention was developed to eliminate these conventional drawbacks, and has a simple structure that allows the opening state of the cassette lid (the rotational stop angle of the lid) to be set in at least two stages. A cassette that opens and closes the lid within a narrow rotation angle range (e.g., 30° to 60°), and can be opened by rotating the lid to a wider angle (e.g., 90° or more) when performing head cleaning, etc. The purpose of this invention is to provide a cassette lid opening/closing mechanism for a tape recorder.

That is, the cassette tape recorder cassette lid opening/closing mechanism according to the present invention includes a spring member rotatably attached to the cassette tape recorder body that biases the cassette lid to rotate in the direction of opening, and a spring member that biases the cassette lid to rotate. a friction member that applies a friction force against the cassette lid, and when the cassette lid is rotated in the opening direction by the spring member and reaches a certain rotation angle position, the end of the cassette lid is applied to the friction member. The rotation is stopped upon contact, and when the cassette lid is further manually rotated in the opening direction from the fixed rotation angle position, it is held at the arbitrary rotation angle position by the frictional force of the friction member. It is characterized by

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

1 and 2 show a cassette tape recorder 1 to which a cassette lid opening/closing mechanism is applied as an embodiment of the present invention, with the cassette lid closed and the lid stopped at the first rotational angle position. FIG. 3 is an external perspective view showing each opened state.

In FIGS. 1 and 2, the main body 2 of the cassette tape recorder 1 has an approximately rectangular parallelepiped shape as a whole, and one of the two larger surfaces of the rectangular parallelepiped is the front surface, and a central portion of the front surface is a rectangular parallelepiped. A cassette storage recess 4 for storing a tape cassette 3 is formed. A cassette lid 5 that covers at least the cassette storage recess 4 is rotatably mounted on a rotation shaft 6 provided near the bottom of the tape recorder main body 2. Further, on the top surface of the tape recorder main body 2, operation buttons 7 for selecting various operation modes such as recording, playback, fast forward, and rewind are arranged, and on the side, various input/output jacks 8 and a volume (not shown) are provided. Knobs, etc. are provided.

Furthermore, an operating knob 10 as an operating member for unlocking the lid is provided near the tip of the cassette lid 5 on the front side of the main body 2. In the state shown in FIG. By moving the cassette lid 5 in the direction of arrow A in the figure, the lock of the cassette lid 5 is released, and the restoring force of the spring member, etc. that biases the cassette lid 5 to rotate in the opening direction (direction of arrow P), as shown in FIG. The cassette lid 5 is opened in this state. Locking claws 9a, 9b are formed on the inner surface of the upper end of the cassette lid 5, and these locking claws 9a, 9
At the ends of the cassette storage recess 4 on the tape recorder main body 2 corresponding to the cassettes 1 and 2, respectively, there are provided locking protrusions 11a and 11b that can be retracted and retracted by the action of a spring or the like.

Next, FIG. 3 shows a schematic cross-sectional view of the vicinity of the rotation shaft 6 of the cassette lid 5. As shown in FIG. A cylindrical bearing portion 12 is integrally formed in at least a portion of the cassette lid 5 in the vicinity of the rotation axis in the axial direction, and a curved surface portion 13 serving as a sliding portion shaped to follow the circumferential surface of the bearing portion 12. is continuously formed integrally with the main part (plate-shaped part) of the cassette lid 5. As the spring member for biasing the cassette lid rotation, for example, a torsion coil spring 14 disposed around the rotation shaft 6 is used, and one end of this torsion coil spring 14 is attached to the inner wall surface of the cassette lid 5. The tape recorder main body 2 is rotated in the opening direction (direction of arrow P) with respect to the cassette lid 5 by being in contact with one end and being guided and locked by the guide groove 15 formed in a part of the tape recorder main body 2. It imparts a biasing force. Further, a recess 16 for guiding the curved surface 13 of the cassette lid 5 is formed in the vicinity of the rotation axis of the tape recorder main body 2, and the inner wall surface of the recess 16 has a recess 16 as shown in FIG. 4, for example. A plate spring 17 as a friction member is attached. The mounting position of the leaf spring 17 is the tip portion 18 of the curved surface portion 13 when the cassette lid 5 reaches the first rotation angle position R ₁ when rotating in the opening direction (direction of arrow P). location,
When the cassette lid 5 is rotated beyond the first rotational position _R1 , the leaf spring 17 serving as a friction member slides against the outer periphery of the curved surface portion 13, which serves as a sliding portion, and applies rotational frictional force. . The rotational friction force at this time is such that it can stop the rotation of the cassette lid 5 against the rotation urging force of the torsion coil spring 14, which is the spring member. Furthermore, the upper end surface 19 in the figure of the recessed portion 16 of the tape recorder main body 2 is connected to the cassette lid 5.
When it is rotated further in the opening direction (direction of arrow P) than the first rotational position _R1 , it comes into contact with the tip 18 of the curved surface part 13 at a second rotational angular position _R2 . This restricts the rotation of the cassette lid 5 in the direction of the arrow P.

In the cassette lid opening/closing mechanism having the above configuration, the cassette lid 5 is closed (the first
3), when the lid lock release operation knob 10 is operated to release the engagement between the locking parts 9a, 9b and the locking protrusions 11a, 11b, the first spring member The cassette lid 5 rotates in the opening direction (direction of arrow P) due to the biasing force of a certain torsion coil spring 14, and as shown in FIG. The first rotational angular position abutting the end
At _R1 , the rotation of the cassette lid 5 is stopped and the first lid is opened as shown in FIG. At this time, the lid opening angle, that is, the angle from the lid closed position to the first rotation angle position _R1 , is preferably 30° to 60°, and by setting it to about 45°, for example, the tape cassette 3 The lid can be attached and removed without any trouble, and the lid can be easily closed from the open state because the rotation range is relatively narrow.

Next, when performing head cleaning, etc., the cassette lid 5, which has stopped rotating at the first rotation angle position _R1 , is rotated directly with fingers or the like in the direction of arrow P, which is the lid opening direction. When the cassette lid 5 is moved, the outer circumferential surface of the curved surface portion 13 serving as the sliding portion comes into frictional contact with the leaf spring 17, which is the frictional member, and this frictional force moves the cassette lid 5 to any arbitrary position between the rotational angular positions R ₁ and R ₂ . It can be held and rotated at any angle. and,
The cassette lid 5 can be opened to the second rotation angle position _R2 to obtain a large opening angle (for example, about 90 degrees), and head cleaning etc. can be easily performed.

It should be noted that the present invention is not limited to the above-described embodiment, and, for example, there is no need for a structure in which the rotation of the cassette lid is restricted at the second rotation angle position.

In addition to the torsion coil spring, other spring members for urging the cassette lid to rotate in the opening direction include:
A tension coil spring, a compression coil spring, a leaf spring, etc. can be used, and as the friction member, other than the leaf spring, various members that apply a frictional force to the rotation of the cassette lid can be used.

[Brief explanation of the drawing]

All figures show one embodiment according to the present invention.
2 and 2 are external perspective views of the entire cassette tape recorder to which the lid opening/closing mechanism of the embodiment is applied, showing the cassette lid in the closed and open states, respectively, and FIG. 3 shows the vicinity of the rotation axis of the cassette lid. 4 is a perspective view showing a leaf spring as a friction member, and FIGS. 5 and 6 are sectional views showing the vicinity of the rotation axis of the cassette lid stopped at different rotation angles. DESCRIPTION OF SYMBOLS 1...Cassette tape recorder, 2...Tape recorder body, 3...Tape cassette, 5...Cassette lid, 6...Rotating shaft, 13...Curved surface portion, 1
4...Torsion coil spring, 17...Leaf spring, 18...
...Tip.

Claims (1)

[Scope of utility model registration request] The cassette lid is rotatably attached to the cassette tape recorder body, and has a spring member that biases the cassette lid to rotate in a direction to open the cassette lid, and a friction member that applies a frictional force to the rotation of the cassette lid. When the cassette lid is rotated in the opening direction by the spring member and reaches a certain rotation angle position, the end of the cassette lid comes into contact with the friction member and rotation is stopped;
A cassette tape recorder characterized in that when the cassette lid is further manually rotated in the opening direction from the fixed rotation angle position, the cassette lid is held at an arbitrary rotation angle position by the frictional force of the friction member. Cassette lid opening/closing mechanism.