JPH0135418B2 - - Google Patents

Description

[Detailed description of the invention] Industrial applications The present invention relates to a rotating recording medium clamping device.

Prior Art Generally, rotating recording media (video disks and
A device for reproducing a PCM audio disk (hereinafter referred to as a disk) has a structure in which a signal pickup is placed on a turntable and moves in the radial direction of the disk rotating at high speed to reproduce the signal of the disk. be. One type of disc playback device is a playback device that allows a disc to be loaded into the device for playback by inserting and removing a case containing the disk from the device. This playback device is equipped with a disk clamp mechanism that clamps the outer groove guard of the disk when the case is inserted deep into the playback device. The disc is clamped and removed relative to the case being removed, leaving it in the playback device.

In the conventional disk clamp mechanism, both the upper and lower clamp arms are rotatably supported, and the lower and upper clamp arms are locked with a gap between them corresponding to the thickness of the groove guard. It is configured to clamp the disk. Therefore, the gap between the upper and lower clamp arms does not change depending on the actual dimensions of the clamped disk, but is always constant. Furthermore, since the upper and lower clamp arms are originally rotatable, if they are forcibly pried open, there is a risk that they will rotate somewhat in the direction of releasing the clamp. On the other hand, the thickness of the groove guard of the disk varies due to variations in the stamper itself or during molding. For this reason, especially in the case of a disk whose groove guard has a small thickness dimension, the disk is clamped, but the groove guard is in an unstable state where it easily slips out from between the upper and lower clamp arms, and when the disk case is removed (at this time). (A force in the removal direction is applied to the disk due to the frictional force between it and the case), and there was a problem in that the groove guard could slip out from between the upper and lower clamp arms, causing an accident in which the disk could come off from the clamp mechanism.
Means for Solving the Problems The present invention aims to provide a rotating recording medium clamp device that solves the above problems, and in which a case containing a rotating recording medium is inserted into a playback device. In a device that clamps the outer peripheral groove guard of the rotating recording medium between an upper clamp arm and a lower clamp arm by a subsequent pulling operation, the upper clamp arm is fixedly provided, and the lower clamp arm is rotated. a clamp force biasing mechanism which is movably supported and biased to rotate the lower rotating clamp arm in the clamping direction; and a clamp force biasing mechanism which restricts the lower rotating clamp arm to a non-clamping position. A regulation control mechanism is provided that releases the regulation on the lower rotating clamp arm when the outer peripheral groove guard of the rotating recording medium reaches a clamping position,
The lower rotary clamp arm is released from restriction and rotates to a position where it clamps the outer groove guard of the rotary recording medium in cooperation with the upper fixed clamp arm.

Embodiment Next, an embodiment of the rotating recording medium clamping device according to the present invention will be described.

First, with reference to FIG. 1, a disc playback apparatus to which the apparatus of the present invention is applied will be schematically explained.

The disk playback device 1 includes a disk 3 housed in a disk case 2 shown exploded in FIG.
Play.

The disk case 2 consists of a jacket 4 and a lid plate 5. A disk 3 is housed in a flat space of a jacket 4. The lid plate 5 consists of a main body 7, a collar 8 at the front end of the main body 7, and engaging arms 9 on the left and right sides. This lid plate 5 is connected to the jacket 4 by a protrusion 10 of an engaging arm 9 engaging a recess 11 in a side wall of the jacket, and a collar 8 closing an opening 12 of the jacket 4.

The disc playback device 1 includes a jacket opening mechanism (opener) 21 that opens the opening of an inserted jacket, a turntable 22 on which the disc 3 is placed and rotates it, and the main parts of the present invention that clamp the disc 3. Nasu disk clamp mechanism 2
3. Lid plate locking and holding mechanism 2 that locks and holds the lid plate 5 when the disk is attached and releases the lid plate 5 from being locked when the disk is retrieved.
4, 24A, a lid plate coupling release mechanism 25, 25A that releases the coupling of the lid plate 5 to the jacket 4 when the disk case 2 is inserted to the back,
2, the disk lifting mechanism 26 and the signal pick-up body 27 are moved in the disk radial direction (arrow Y ₁ ,
It includes a signal pickup body transfer mechanism 28 for transferring the signal pickup body in _two directions (Y direction), a control mechanism section 29 for switching and operating the disk elevating mechanism 26, and the signal pickup body transfer mechanism 28.

The jacket expansion mechanism 21 has upper and lower beams 40 and 41, and the left and right ends are connected to the guide rail 4.
2 and 43, the position above the turntable 22 is moved in the directions of arrows X ₁ and X ₂ . The signal pickup body 27 is mounted on a carrier 44 that is movable in the directions of arrows Y ₁ and Y ₂ . The disk clamp mechanism 23 is provided deep inside the device 1,
It has a pair of upper and lower clamp arms 45 and 46.

To play a disc, insert the disc case 2 into the device 1 by operating a standby button (not shown).

By operating the standby button, the control mechanism section 29 is activated, the disk lifting mechanism 26 is activated, the disk support structure 47 is raised, and the disk clamp mechanism 23 is placed in a disk clamp standby state.

When the disk case 2 is inserted into the device ₁ in the direction of arrow
The opening 12 is expanded vertically by the expansion mechanism 21 and inserted. Disk case 2 is device 1
When the disk is inserted deep into the disk, the first result is that the disk clamp mechanism 23 operates and its clamp arms 45 and 46 clamp the group guard 3a of the disk 3, as will be described later. As a second result, the lid plate locking and holding mechanisms 24, 24A are operated, and the locking fingers 48, 48A are rotated in a direction to relatively enter the L-shaped notch 13 of the lid plate 5 and lock it. move. As a result, the lid plate 5 is locked to the locking fingers 48, 48A, placed on the support fingers 49, 49A, and held at the inner part of the device 1. Furthermore, as a third result, the lid plate 5 is uncoupled from the jacket 4 by the lid plate coupling release mechanisms 25, 25A.

Next, when the disk case 2 is pulled out in the direction of arrow _X2 , the lid plate 5 and the disk 3 remain in the device 1, and only the jacket 4 is pulled out.
The disk 3 is clamped by the clamp mechanism 23 at the groove guard 3a at the back of the device, and the center hole 3
The disk support structure 4 in the raised position around b
7 and is horizontally supported directly above the turntable 22.

When the jacket 4 is pulled out of the apparatus, the disk clamp mechanism 23 becomes unclamped, the disk support structure 47 descends, the disk 3 is placed on the turntable 22, and the center hole 3b is clamped by the clamp claw mechanism 50. is clamped and mounted on the turntable 22. In this state, a turntable motor (not shown) is started, and the disk 3 rotates in the direction of arrow A together with the turntable 22.

Also, the carrier 44 moves in the direction of arrow _Y1 ,
The signal pickup body 27 scans the recording surface of the disk 3 relatively, and the information signal is reproduced.

Next, to explain the operation and operation of removing the disk 3 from the playback device 1 and recovering it in the disk case 2, as the playback operation is completed, the carrier 44 (signal pick-up body 27) moves in the direction of arrow Y ₂ . Then, the disk support structure 47 rises and the disk 3 is pushed up, and the pushed up disk 3 is clamped by the clamp mechanism 23.

When recovering the disc, the empty jacket 4 is reinserted into the playback device 1 with the opening at the tip.
The expansion mechanism 21 is pushed by the jacket 4 and moves in the direction of arrow _X1 again, opening the opening 12 of the jacket 4.
expand. As the jacket 4 is inserted in the direction of arrow _X1 , the disk 3 is inserted into the jacket 4 relative to the opening 12. When the jacket 4 is pushed to the final position, the disk 3 is housed in the jacket 4, and the lid plate 5 closes the opening of the jacket 4 and enters the jacket 4. Further, the lid plate 5 is separated from the lid plate coupling release mechanisms 25 and 25A, and the lid plate 5 is coupled to the jacket 4. Therefore, jacket 4
By pulling out the lid plate 5 in the direction of arrow X ₂ , the lid plate ₅ remains connected to the jacket 4.
The disc 3 is removed from the playback device 1 and collected into the disc case 2.

Next, the disk clamp mechanism 23 according to the present invention will be explained with reference to FIG. 3 and subsequent figures.

FIG. 3 is a perspective view showing the disk clamp mechanism taken out, and FIGS. 4A and B and 5A and B.
1 and 2 respectively show the states of the upper and lower clamp arms of the disk clamp mechanism and the state of the lower clamp arm rotation regulation control mechanism in correspondence.

In the disc clamp mechanism 23, the upper clamp arm 45 is fixed to the back wall 60 of the disc playback device 1 horizontally at a predetermined height position, and the lower clamp arm 46 is rotatably supported on a shaft 61. has been done. The lower clamp arm 46 has a pin 62 hanging down and implanted therein, which is locked by a cam 63a of the control lever 63, so that its rotational position is regulated. Note that the lower clamp arm 46 is connected to the cam 63 mentioned above.
In the state where the restriction by a is released, _as shown in FIG. It is provided so that it can be rotated to a position slightly larger than _t1 . In addition, in the final rotation state of the lower clamp arm 46, the upper and lower clamp arms 4
The dimension l ₃ between 5 and 46 is determined to be somewhat smaller than the thickness t ₂ of the groove guard 3a of the disk 3.

The control lever 63 is connected to the chassis 64 of the playback device 1.
It is pivotally supported by the upper pin 65, and its rotational position is controlled by a pin 67 fitted in the L-shaped groove 63b. The pin 67 is implanted in a slide plate 68 that supports the lid plate locking and holding mechanisms 24, 24A.

Next, to explain the operation of the above mechanism, in the state before inserting the disk case, the lower clamp arm 4
6 is rotating counterclockwise as shown by the two-dot chain line in FIG. 4A, the slide plate ₆₈ is moving in the direction of arrow It is in the rotational position shown in A.

When the standby button is operated, a motor (not shown) is started, the main gear 69 is rotated counterclockwise, the pull lever 70 is pulled by the rod 71 and rotated clockwise, and the lower clamp arm 46 is rotated clockwise.
The coil spring 72 is pulled by the pull lever 70 and rotates clockwise. The lower clamp arm 46 is
As shown in FIGS. 3 and 4A, the pin 67 is rotated to a position where it is locked to the stepped surface 63a- ₁ of the cam 63a, but further rotation is restricted.
That is, the lower clamp arm 46 is similar to the upper clamp arm 4.
5, the dimensions that can accommodate disk 3 from this l ₂
Rotation is restricted in a state in which the disk approaches a position that is a certain distance away, and is in a disk clamp standby state in which it is urged to rotate clockwise (in the disk clamp direction) by the spring force of the expanded coil spring 72. Dimension l ₂ is the thickness dimension of the outer groove guard 3a of the disk 3
t ₂ (see Figure 4B).

When the disk case 2 is inserted in this state, the slide plate 68 is pushed by the disk case 2 during the final insertion process and moves against the coil spring 73 as shown in the arrow.
It moves in the _X1 direction, and the outer groove guard 3a of the disk 3 enters between the upper and lower clamp arms. Just before the slide plate 68 reaches its final position, that is, until the pin 67 reaches the position indicated by the two-dot chain line in FIG. 5A,
Although the control lever 63 is urged to rotate clockwise by the coil spring 74, it is maintained at its original rotational position.

When the disk case 2 is inserted to the final position, the pin 67 is inserted into the bent portion 63b of the L-shaped groove 63b.
- ₁ , the control lever 63 is rotated clockwise by a spring 74, as shown in FIG. 5B. As the control lever 63 rotates, the cam 63a facing the pin 62 is moved from the protruding surface 63a- ₁ to the concave stepped surface 63a.
_-2 , the pin 62 is released from being locked by the stepped surface 63a- ₁ . That is, the lower clamp arm 46 is released from its rotational restriction, and instantaneously rotates clockwise by a small angle by the spring force exerted by the coil spring 72, thereby moving the groove guard 3a of the disk 3 to the upper clamp arm. 45 to clamp instantly.

Here, the cam 63a is dimensioned and shaped so that a gap g always exists between the pin 62 and the concave step surface 63a- ₂ when the disk is clamped. Therefore, after the rotation restriction is released, the lower clamp arm 46 rotates without being restricted in the middle until it comes into pressure contact with the disk and is restricted from rotating, and the disk 3 is rotated in the groove. The upper and lower surfaces of the guard 3a are pressed and clamped by the upper clamp arm 45 and the lower clamp arm 46 by the spring force of the coil spring 72.

Therefore, the final rotational position of the lower clamp arm 46 changes in accordance with the actual dimensions of the outer group guard of the disc to be clamped, and even if the thickness of the groove guard is small, the disc is clamped with the groove guard crimped between the upper and lower clamp arms. For this reason,
The escape side of the groove guard from the clamp part has a claw part 45a, as in the case of clamping a disk whose thickness dimension of the groove guard is the standard dimension.
46a, and the escape of the groove guard from the clamp portion is reliably restricted as the groove guard collides with the inside of the melon portions 45a, 46a. In addition, since the upper clamp arm 45 is originally fixed, it is fixed more firmly and with better positional accuracy than when the rotatable clamp arm is locked and fixed, and no matter how much prying force is applied, it will not move upward. There is no displacement. As a result, even if a large force is applied to the clamped disk in the removal direction when removing the jacket 4, the disk is kept stably in the clamped state and does not come out of the clamp part and into the device. Accidents such as falling do not occur.

Effects As described above, the rotating recording medium clamping device according to the present invention has the following features.

The lower clamp arm is restricted in its rotation to the non-clamping position, and then released and rotated to the position where it clamps the outer peripheral groove guard of the rotating recording medium in cooperation with the upper clamp arm, so the thickness of the groove guard Even thin discs can be clamped without the groove guard slipping out from the clamp part.

The upper clamp arm is originally fixed, and compared to a case where a rotatable arm is locked and fixed, it can be set in a fixed position more firmly and accurately, and the groove guard can be fixed at the upper side. There is absolutely no chance of the clamp arm being pushed away and coming out of the clamp section, improving the reliability of the disk clamp.

[Brief explanation of drawings]

FIG. 1 is a plan view showing a disk playback device to which the rotating recording medium clamping device of the present invention is applied before a disk is mounted, with the top cover removed; FIG. FIG. 3 is an exploded perspective view of one example of a disk case, FIG. 3 is a perspective view showing the disk clamp mechanism, which is the main part of the present invention, taken out, and FIGS. 4A and B show the disk before clamping and in the disk clamped state, respectively FIG. 5A is a side view schematically showing the relationship between the upper clamp arm and the lower clamp arm of the disk clamp mechanism of
B is a diagram showing the relationship between the control lever and the pin when the upper and lower clamp arms are in the states shown in FIGS. 4A and 4B, respectively. 1... Disc playback device, 2... Disc case, 3... Disc, 4... Jacket, 5...
lid plate, 21...jacket expansion mechanism,
22... Turntable, 23... Disc clamp mechanism, 24, 24A... Lid plate locking and holding mechanism, 25, 25A... Lid plate coupling release mechanism, 26... Disc lifting mechanism, 27...
Signal pick-up body, 28...Signal pick-up body transfer mechanism, 29...Control mechanism section, 45...Upper clamp arm, 46...Lower clamp arm, 45a,
46a... melon part, 47... disk support structure,
60... Rear wall, 61... Shaft, 62... Pin, 6
3...Control lever, 63a...Cam, 63a- ₁
...Protruded surface, 63a- ₂ ...Concave step surface, 63b...
L-shaped groove, 63b- ₁ ...Bending portion, 64...Chassis, 65, 67...Pin, 68...Slide plate, 69...Main gear, 70...Pull lever,
71... Rod, 72, 73, 74... Coil spring.

Claims (1)

[Claims] 1. In a device that clamps the outer circumferential groove guard of the rotating recording medium between an upper clamp arm and a lower clamp arm by inserting a case containing a rotating recording medium into the playback device and then pulling it out. The upper clamp arm is fixedly provided,
a clamp force biasing mechanism rotatably supporting the lower clamp arm and biasing the lower rotary clamp arm to rotate in the clamping direction; A regulation control mechanism is provided for regulating the lower rotating clamp arm to a clamp position and releasing the regulation on the lower rotating clamp arm when the outer peripheral groove guard of the rotating recording medium reaches the clamping position. 1. A rotating recording medium clamping device, characterized in that the arm is released from restriction and rotates to a position where the outer peripheral groove guard of the rotating recording medium is clamped in cooperation with the upper fixed clamp arm.