JPH0610911B2 - Disc clamp mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Overview] Regarding a disc clamp mechanism for clamping a disc, a fixed support receives and holds a rotational force generated by pushing one side of a disc with a driven roller and the other side with a disc clamper. In this state, by moving the driven roller and the disc clamper in conjunction with each other, the holding state of the disc is maintained and the disc is moved to the recording / reproducing position for clamping, and the free movement of the disc immediately before clamping is regulated and securely clamped. .

[Industrial application field]

The present invention relates to a disc clamp mechanism for clamping an information recording / reproducing disc made of a rigid disc at a recording / reproducing position.

For example, in a compact disc (CD), a laser disc (LD) device, etc., a rigid disc-shaped medium is used as a recording medium. The present invention relates to a disc clamp mechanism for clamping such a rigid disc at a recording / reproducing position.

[Conventional technology]

Disc clamping is generally carried out by transporting the disc to a position where the center axis of the disc and the center axis of the turntable are almost aligned, and then pressing the disc onto the turntable in such a way that the disc clamper clamps it. Is. In that case, the position of the disk is a problem, and if the center axis of the disk and the center axis of the turntable deviate beyond a certain limit, clamping becomes impossible. Although various measures have been taken to prevent this, a representative one is the mechanism shown in FIG. In this figure, A, B, and C are the disk 11 and the disk 11 on the right side surface, the left side surface, and the rear surface, respectively, in the insertion direction.
Represents the distance from the wall that guides. Where A,
The conventional mechanism is to reduce the lengths of B and C as much as possible and to control the deviation of the center axis of the disk within an allowable range.

[Problems to be solved by the invention]

According to the above-mentioned mechanism, it is possible to prevent the displacement between the left and right and the front and back. However, there is a problem that the above-mentioned mechanism cannot prevent the inclination of the surface of the disk such as a so-called front-down state.

Further, in a device in which a disc clamp mechanism is incorporated, there is generally a vibration due to rotation of a motor, etc., and therefore there is a problem that the disc clamper may be displaced or tilted forward before being pressed against a turntable.

Accordingly, it is an object of the present invention to provide a disc clamp mechanism that overcomes the above problems.

[Means for Solving the Problems]

FIG. 1 is a principle view of the disc clamp mechanism of the present invention. According to this figure, the disc clamping mechanism of the present invention comprises a driven roller 13 for pushing one side of the disc 11 and a disc 11
Disk clamper 32 for pushing the other surface of driven roller 13
And the disk 11 by the pressing force of the disk clamper 32
The fixed support portion 61 that receives the rotational force of the disk 11 to hold the disk 11 and the driven roller 13 and the disk clamper 32 are interlocked with each other to maintain the holding state and to hold the disk 11
And a drive means 71 for moving and clamping the disc to a clamping position.

[Work]

Since the disk 11 is held by the driven roller 13, the disk clamper 32, and the fixed support portion 61 until the disk 11 is pushed by the disk clamper 32 and reaches the clamp position, the disk surface tilts and the forward displacement and tilt due to vibration, etc. Does not happen and is securely clamped.

〔Example〕

FIG. 2 is a side view showing a CD player for reproducing a compact disc (CD) as an example in which the disc clamp mechanism of the present invention is incorporated together with a disc insertion / ejection mechanism, a disc clamper driving and holding mechanism. Of these (1)
Represents a state immediately before the disc clamper 32 descends, and (3) represents a state in which the disc 11 is clamped between the disc coupler 32 and the turntable 31,
(2) represents an intermediate state between (1) and (3).

First, the disc insertion / ejection mechanism will be described. When viewed from the disc insertion side (left side in FIG. 2), the guide rail 14 is provided with a horizontally long slot to determine the insertion position of the disc 11. The drive roller 12 uses the disk 11 as the driven roller 1
It is rotated by a driving means (not shown) so as to be inserted and ejected between 3 and. The driven roller 13 has two ends on its shaft.
One of the guide grooves 15-1 and 15-2 (15-2 is not shown) is guided, and two elastic members 16-1 and 16-2 (16-2 are not shown) are used to guide the drive roller 12. Biased in the direction.

When a disc is inserted into the long hole provided in the guide rail 14, the first detector (not shown) detects it and the drive roller 12 starts rotating in the disc insertion direction.
The driven roller 13 contacting with it also starts to rotate. At this time, the driven roller 13 and the guide rail 14 are shown in FIG.
It is in the position indicated by (1). When the disk 11 is pushed between the rotating driving roller 12 and the driven roller 13,
The disk 11 is drawn between the two rollers and slides in the insertion direction. When the disk 11 reaches the position shown in FIG. 2 (1), the rotation of the drive roller 12 which is detected by a second detector (not shown) is stopped. Fig. 2 (1)
In the drawing, it is drawn as if the drive roller 12 and the driven roller 13 are in contact with each other. However, in reality, after the two rollers sandwich the disk 11, the driven roller 13 is at the bottom of the figure by the thickness of the disk 11. Is pushed down to. At this time, the guide rail 14 cannot move from the position shown in FIG. 2 (1), so that the shafts at both ends of the driven roller 13 are guided by the guide grooves.
Bias force of the elastic members 16-1 to 16-2 acts downwardly along 15-1 to 15-2 and acts against it, so that a uniform crimping force is obtained in the axial direction.

Next, the disk clamper drive and holding mechanism will be described.

The drive lever 52 has two slits 521 including a slit 523 including a drive holding slit 54 and a drive slit 55,
522 is provided. These two slits 521,52
2 horizontally guides the pins 103 and 104 integrated with the housing 100, and when viewed in the opposite direction, the drive lever 52 can slide horizontally with respect to the housing. It is the pin 712 (described later in detail) that pushes the drive lever 52 to the left, and the elastic member 56 that biases it to the right against it. The clamper arm 33 and the transmission lever 51 are integral with each other and can rotate about the rotation shaft 34. A pin 53 is integrally provided on the transmission lever 51, and the pin 53 is guided by a slit 523 including a drive holding slit 54 and a drive slit 55 provided on the drive lever 52.

The relationship between the clamper arm 33 and the disc clamper 32 is such that the center portion of the disc clamper 32 is loosely fitted in the circular hole of the clamper arm 33. The disk clamper 32 is a, b, c (c>a> b) in order from the top of the figure.
The discs are concentrically stacked and the clamper arm 3
The relation with the size of the hole diameter d of 3 is a>d> b. In order to fit the disc clamper 32 into the clamper arm 33, a hole of diameter e having a relation of a <e is formed in the clamper arm 33, and this hole is connected to the hole of diameter d like a snow dharma. ing. At the time of mounting, the disc clamper 32 is fitted into the hole of diameter e from the side of the diameter a, moved to the hole of diameter d, and the stopper 110 is screwed to the clamper arm 33 so that the disc clamper 32 has the hole of diameter e. The disk clamper 3
2 is attached to the clamper arm 33.

Next, the operation of the disk clamper driving and holding mechanism will be described. When the second detector described above detects that the disk 11 has reached the position shown in FIG. 2 (1), the rotation of the drive roller 12 is stopped and the pin 712 starts moving to the right.
At the position shown in FIG. 2 (1), the drive lever 52 has the elastic member 56.
It is pushed by the pin 712 due to its biasing force and is in the position as shown. When the pin 712 moves horizontally to the right in the figure, the drive lever 52 slides to the right due to the biasing force of the elastic member 56. Then, the pin 53 becomes the drive lever 5.
The transmission lever 51 and the clamper arm 33, which are integrated with the pin 53, are lowered, and the disc clamper 32 is also lowered, because the guide lever 2 guides the slit to the slit 2. In Fig. 2 (2), pin 5
3 is in the middle of being guided down by the drive slit 55 and moving down. In FIG. 2 (3), the pin 53 is guided to the drive holding slit 54 via the drive slit 55, and as a result, the disc damper 32 clamps the disc 11 at a predetermined position on the turntable 31. When the clamp is completed, the clamper arm 33 does not descend even if it is pushed further, so that the clamper arm 33 stops descending, and the pin 53 is stopped with a margin to be guided into the drive holding slit 54, so that the drive arm 52 is also stopped. . But pin 71
2 still moves to the right, which causes pin 712 and drive arm 52 to separate. The purpose of this operation will be described later. The drive holding slit 54 is provided so as to guide the pin 53 in the radial direction of a circle centered on the rotary shaft 34 of the clamper arm. Therefore, even if the disc clamper 32 receives a force such that the disc clamper 32 is lifted, the direction in which the pin 53 moves and the direction in which the pin 53 is guided are at a right angle, and therefore the disc clamper 32 is not lifted by this force. Further, the drive lever 52 is always pulled to the right in the figure by the elastic member 56, and can move because the direction of this force is not at right angles to the direction in which the pin 53 is guided. The force acts as a force to lower the disc clamper 32 downward. Therefore, the clamping force of the elastic member 56 always acts, and the disc clamper 32 and the turntable 31 are completely clamped together with the force of attracting each other by the magnetic force. Further, since the angle formed by the guide direction of the drive slit 55 and the drive direction of the drive lever 52 is larger than that of the drive holding slit 54, the horizontal displacement of the drive lever 52 required to move the disc clamper 32 up and down by a predetermined distance. Has contributed to downsizing of the device.

Lastly, a portion corresponding to a specific example of the disc clamping mechanism according to the present invention for clamping the disc 11 while appropriately holding it will be described.

The main lever 711 has slits 714 and 715, and guides the pins 102 and 105 integrated with the housing in the horizontal direction in the figure. Therefore, the main lever 711 can also slide in the horizontal direction like the drive lever 52. Main lever 71
Although not shown, 1 is screwed integrally with a member provided with a rack, and is driven left and right in the figure by rotating a pinion gear meshing with the rack with a motor. The aforementioned pin 712 is integral with this main lever 711, and the left and right movements of the main lever 711 cooperate with the elastic member 56 to move the drive lever 52 left and right, and as a result, the disc clamper 32 is moved up and down. Slit 7 on main lever 711
13 is also provided, and since this slit 713 guides the pin 101 integrated with the guide rail 14, the main lever 711
The left and right movements of also play a role of moving the guide rail 14 up and down.

As an example, if slits 713 are provided as shown in FIG. 2 and the relative positional relationship between each lever and pin is determined as shown in the figure,
The following operations can be performed. First, Fig. 2 (1)
When the main lever 711 is moved to the right from the state of to the state of (2),
Since the guide rail 14 does not move and therefore the state sandwiched between the driving roller 12 and the driven roller 13 hardly changes, the disc clamper 32 descends and one end of the disc / 1 descends to come into contact with the fixed support portion 61. Retained. When the main lever 711 further moves to the right from the state of FIG. 2 (2), the disc clamper 32 further descends and at the same time,
When the pin 101 is guided by the inclined portion of the slit 713 and descends, the guide rail 14 starts descending, and when both ends of the shaft of the driven roller 13 reach the upper ends of the guide grooves 15-1 and 15-2, the driven roller also descends. At the beginning, the disc 11 finally separates from the drive roller 12, and is supported by three points of the driven roller 13, the disc clamper 32, and the fixed support portion 61, and the other end starts to descend. By appropriately adjusting the inclination of the slit 523 and the inclination of the slit 713, it is possible to guide the disk 11 to the clamp position while always supporting the disk 11 at three points with a constant force.
Therefore, the free movement of the disk 11 immediately before clamping is restricted and the disk 11 is reliably clamped. When the disc 11 is completely clamped, the drive arm 52 cannot move and is separated from the pin 712 as described above.
4 further descends, whereby the driven roller 13 separates from the disk 11, and finally the state shown in FIG. 2 (3) is reached. This state is detected by pressing a first limit switch (not shown) with a protrusion (not shown) provided on the main lever 711, and the driving motor is stopped.

Although the operation from the insertion of the disc to the completion of the clamp has been described above, the operation from the release of the clamp to the ejection of the disc only follows the reverse path, and therefore will not be described in detail. The end of the leftward movement of the main lever 711 is detected by a second limit switch (not shown) provided opposite to the above-mentioned first limit switch, and at the same time when the main lever 711 stops, the drive roller 12
Starts rotating in the discharging direction.

〔The invention's effect〕

As described above, in the disc clamping mechanism of the present invention, the disc is prevented from tilting immediately before clamping, or from being displaced or tilted due to vibration, so that the disc is reliably clamped.

[Brief description of drawings]

 FIG. 1 is a principle diagram of the present invention, FIG. 2 is a diagram showing an embodiment of the present invention, and FIG. 3 is a diagram for explaining a conventional system. In the figure, 11 ... Disk, 13 ... Followed roller, 32 ... Disk clamper, 61 ... Fixed support portion, 71 ... Driving means.

Claims (1)

[Claims] 1. A driven roller (13) for pressing one surface of a disk (11), a disk clamper (32) for pressing the other surface of the disk (11), the driven roller (13) and the disk. Rotated by the pressing force of the clamper (32)
The holding state of the disc (11) by interlocking the fixed support portion (61) for receiving the rotational force of 1) and holding the disc (11), the driven roller (13) and the disc clamper (32) with each other. And a drive means (71) for moving and clamping the disc (11) to a recording / reproducing position while maintaining the above.