JPH051035Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a lid opening/closing mechanism, and more particularly to a lid opening/closing mechanism that has a protective function against the opening/closing operation of the lid.

Generally, in devices such as tape recorders, video tape recorders, and digital audio tape recorders in which a tape cassette is inserted into a tape slot to perform recording and playback processing, a lid is provided to cover the tape slot to prevent dust from entering the device body. This lid is designed to open and close automatically when a tape cassette is inserted or removed by a lid opening and closing mechanism provided near the tape slot.

Problems to be Solved by the Invention However, in the conventional lid opening/closing mechanism described above, the driving force of a motor serving as a driving source is directly transmitted to the lid opening/closing mechanism using gears, belts, etc. For this reason,
If your hand is accidentally caught during the operation of the lid opening/closing mechanism, or if an obstacle enters and obstructs the opening/closing operation, the load will be applied to the gears, belts, motors, and configuration of the opening/closing mechanism. There was a problem in that the voltage was applied to parts and the like, causing failure of the mechanism.

Therefore, an object of the present invention is to provide a lid opening/closing mechanism that solves the above problems by using two spring members.

Means for Solving the Problems In order to solve the above problems, the present invention includes a lid body, an opening/closing lid member rotatably attached coaxially to the central axis of rotation of the lid body, and A first spring that biases the lid to rotate in one rotation direction relative to the lid member, and a first spring that biases the lid to rotate in a direction opposite to the first rotation direction with respect to the opening/closing lid member. A second spring is provided in the lid opening/closing mechanism.

Embodiment FIG. 2 shows a schematic configuration of a digital audio tape recorder provided with an embodiment of the lid opening/closing mechanism (hereinafter simply referred to as mechanism) according to the present invention. The mechanism 1 is disposed at a front position of a chassis 2 of, for example, a digital audio tape recorder, and generally includes a lid body 3, an arm member 4, an opening/closing lid gear 5, a first spring 6, a second spring 7, and a drive gear. It has an extremely simple configuration consisting of 8 mag.

The lid 3 opens and closes a tape cassette insertion slot (not shown) formed in the chassis 2.
A support shaft 9 formed in the arm member 4 at a predetermined lower position
The protrusion 10 is rotatably supported by the chassis 2, and the protrusion 10 engages with a guide groove 11 (indicated by a chain line) formed in the chassis 2. Therefore, by the displacement of the arm member 4, the lid body 3 is positioned on the support shaft 9 and the protrusion 10, and while maintaining a state substantially parallel to the front panel 2a of the chassis 2, opens and closes in the directions of arrows _A1 and _A2 in the figure. do.

The arm member 4 is a plate-like member having a substantially U-shape, and has a support shaft 9 for supporting the lid 3 at one end as described above, and is rotatably supported on the chassis 2 at the other end. Also provided is a support shaft 12 to which the opening/closing lid gear 5 and first and second springs 6 and 7 are attached. The arm members 4 are provided on both sides of the lid 3 in the longitudinal direction (only one side is shown in the figure for convenience) and support both sides of the lid 3. The lid body 3 is opened and closed by rotation of the arm member 4 about the support shaft 12. Incidentally, the mechanism 1 according to the present invention is provided on at least one arm member 4 among the arm members provided on both sides.

The first and second springs 6 and 7 are so-called torsion springs, and one end portions 6a and 7a are connected to the arm member 4.
The other ends 6b and 7b are attached to the support shaft 12 so as to engage with the opening/closing lid gear 5.
As will be detailed later, the first spring 6 biases the arm member 4 counterclockwise with respect to the opening/closing lid gear 5, while the second spring 7 biases the arm member 4 with respect to the opening/closing lid gear 5. The member 4 is urged clockwise.

The opening/closing lid gear 5 is rotatably supported on a support shaft 12, and a gear portion 5a is formed over a predetermined range. A drive gear 8 rotated by a rotation drive means (not shown) meshes with this gear portion 5a. The lid body 3 is opened and closed by the driving force of the drive gear 8.

Here, FIG. 1 shows an exploded perspective view of the mechanism 1, and will be described in more detail. In the assembled state, the first spring 6 has its end 6a engaged with the first groove 4a of the arm member 4, and its other end 6b engaged with the upper surface of the arm 5b of the opening/closing lid gear 5. It is attached to the arm member 4 in this manner. Therefore, the first spring 6
is the case when the arm member 4 is fixed and the opening/closing lid gear 5 is rotated clockwise (the same is true when the opening/closing lid gear 5 is fixed and the arm member 4 is rotated counterclockwise). It deforms while accumulating elastic force, and when the bias is released, the accumulated elastic force biases the opening/closing lid gear 5 clockwise to return to its original state.

On the other hand, the end portion 7a of the second spring 7 is connected to the arm portion 4.
and the other end 7b engages with the lower part of the arm portion 5b of the opening/closing lid gear 5. ) is configured to engage with an engaging protrusion 4c formed on the arm member 4.
Therefore, the second spring 7 deforms while accumulating elastic force when the arm member 4 is fixed and the opening/closing lid gear 5 is rotated counterclockwise. As above, the first
The second springs 6 and 7 are configured so that their urging forces are in opposite directions, and are fixed by the arm member 4 and the opening/closing lid gear 5, respectively, in normal times.
Note that 13 is a connecting shaft that connects the arm member 4 to other arm members.

Next, the operation of the mechanism 1 having the above configuration will be explained below. When opening the lid 3 from the closed state shown in FIG. 2, the drive gear 8 is rotated clockwise. As a result, the opening/closing lid gear 5 is rotated counterclockwise, and the arm member 4 is mainly biased by the first spring 6, so that the arm member 4 is rotated counterclockwise, and the lid body 3 is rotated counterclockwise.
A The lid is opened in _one direction. FIG. 3 shows a state in which the lid 3 is completely opened. Further, when the lid body 3 is closed from the open state shown in FIG. 3, the drive gear 8 is rotated counterclockwise. As a result, the opening/closing lid gear 5 rotates clockwise, the arm member 4 rotates clockwise mainly due to the bias of the second spring 7, and the lid body 3 is closed in the _A2 direction. go. In normal times when no unexpected external force is applied to the lid body 3 as described above, the first and second springs 6 and 7 are in balance, and as the opening/closing lid gear 5 rotates, the arm member 4
Rotate and energize.

Let us now consider a case where an unexpected external force is applied to the lid 3 (for example, when a hand is caught or an obstacle hits). First, a case where an external force is applied in the _A1 direction in the closed state shown in FIG. 2 will be described. When the lid is in the closed state, the drive gear 8 is stopped, and the opening/closing lid gear 5 is therefore in a fixed state. In this state, if an external force is applied to the lid 3 to cause it to move in the _A1 direction, the arm member 4 will rotate counterclockwise while the opening/closing lid gear 5 is fixed. Therefore, as mentioned above, the second
The spring 7 is elastically deformed as the arm member 4 rotates, allowing the lid 3 to be displaced (as shown in FIG. 4).
At this time, the external force being applied to the lid 3 is not directly applied to the opening/closing lid gear 5 and the drive gear 8, but is applied via the second spring 7. Therefore, the second spring has a buffering effect, and when an external force is applied, the opening/closing lid gear 5,
Damage to the drive gear 8 and the like can be prevented.

Next, in the open state shown in FIG.
A We will explain the case where external force is applied in _two directions. Even in the lid open state, the drive gear 8 is stopped, and the opening/closing lid gear 5 is also in a fixed state. If an external force is applied to the lid 3 in this state to cause it to move in the _A2 direction, the arm member 4 will rotate clockwise while the opening/closing lid gear 5 is fixed.
Therefore, as described above, the first spring 6 is elastically deformed as the arm member 4 rotates to allow the lid 3 to be displaced (as shown in FIG. 5). Therefore, as in the case shown in FIG. 4, damage to the opening/closing lid gear 5, drive gear 8, etc. can be prevented.

Effects of the invention As described above, according to the lid opening/closing mechanism of the present invention, the lid body, the opening/closing lid member rotatably attached coaxially to the rotation center axis of the lid body, and the opening/closing lid member are provided. a first spring that biases the lid to rotate in one rotation direction relative to the opening/closing lid member, and a second spring that biases the lid to rotate in a direction opposite to the first rotation direction with respect to the opening/closing lid member. By providing the spring, even if an unexpected external force is applied to the lid body while the opening/closing lid member is fixed, the first and second springs buffer this external force and the external force is directly applied. It has features such as being able to reliably prevent damage to each component and failure of the mechanism.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of one embodiment of the lid opening/closing mechanism according to the present invention, Fig. 2 is a schematic configuration diagram showing a state in which the lid opening/closing mechanism shown in Fig. 4 and 5 are schematic configuration diagrams for explaining the operation of the lid opening/closing mechanism when an unexpected external force is applied to the lid. . 1... Mechanism, 3... Lid body, 4... Arm member,
5... Opening/closing lid gear, 6... First spring, 6a, 6
b, 7a, 7b... end, 7... second spring, 8
... Drive gear, 12 ... Support shaft.

Claims (1)

[Scope of utility model registration request] a lid, an opening/closing lid member coaxially and rotatably attached to the central axis of rotation of the lid, and rotating the lid in one rotational direction relative to the opening/closing lid member; a first spring that biases the lid, and a second spring that biases the lid body against the opening/closing lid member to rotate in a direction opposite to the first rotation direction.
A lid opening/closing mechanism with a spring.