JPH01235063A - Disk loading/unloading mechanism - Google Patents

Abstract

PURPOSE:To secure uniform pressing force to a disk and to avoid the vibrations of the disk by adding plural guide grooves to a guide rails to guide the shaft of a follower roller to both the press applying and releasing directions together with an elastic member which biases the shaft of the roller in the press applying direction to the guide rail in a rotatable state. CONSTITUTION:At least two guide grooves 15-1 and 15-2 are added to a guide rail 14 to guide the shaft of a follower roller 13 in both the press applying and releasing directions together with the elastic members 16-1 and 16-2 which bias the shaft of the roller 13 in the press applying direction to the rail 14 in a rotatable state. Thus the roller 13 can be pressed in its axial direction with the uniform force regardless of the rather inferior dimensional accuracy of the rail 12 and the guide rail attachment part. Furthermore it is possible to prevent the vibrations of the shaft of the roller 13 caused by the external force within the grooves 15-1 and 15-2.

Description

[Detailed Description of the Invention] [Summary] Regarding a disk insertion/ejection mechanism for information recording/reproduction, a driven roller for press-fitting and inserting/ejecting a disk to a drive roller is rotatably held on a guide rail. By providing at least two guide grooves that guide the shaft of the driven roller of the guide rail in the pressure contact direction and the pressure release direction, and an elastic member that biases the shaft while keeping it rotatable in the pressure contact direction with respect to the guide rail, The number of parts and assembly man-hours are reduced by equalizing the pressure force, preventing vibration, and reducing the drive force of the guide rail.

[Industrial application field]

The present invention relates to a disk insertion/ejection mechanism for inserting and ejecting an information recording/reproducing disk made of a rigid disk into a recording/reproducing position.

For example, in compact discs (CDs), laser discs (LDs), etc., the recording medium is a rigid disc (
A disk-shaped medium is used. The present invention relates to a disk insertion/ejection mechanism for inserting and ejecting such a rigid disk into a recording/reproducing position.

[Conventional technology]

FIG. 3 is a principle diagram showing the principle of a conventional disk insertion/ejection mechanism. The driven roller 13 passes its shafts at both ends through the shaft holes provided in the guide rail 14, and the E IJ song 4-1
and 24-2, so that it is rotatably held relative to the guide rail 14.

The guide rail 14 is driven, for example, in the direction in which the driven roller 13 comes into pressure contact with the drive roller 12 and in the opposite direction by being driven by some kind of driving means (not shown) to rotate forward and backward around the rotating shaft 23 . The drive roller 12 rotates forward and reverse around its rotation shaft 22 by another drive means (not shown). The elastic member 21 biases the guide rail 14 with respect to the main body in a direction in which the driven roller 13 comes into pressure contact with the drive roller 12.

When the disk 11 is inserted between the drive roller 12 and the driven roller 13 while the drive roller 12 is rotated counterclockwise in FIG. 3 and the driven roller 13 is brought into pressure contact with the drive roller 12 by the action of the elastic member 21, As the drive roller 12 rotates counterclockwise, the disk 11 is drawn between the two rollers and slides to the right in the figure. Thereafter, when the drive roller 12 rotates clockwise with the disk 11 sandwiched between the two rollers, the disk 11 slides to the left in the figure. If sliding the disk 11 to the right in the figure is a disk insertion operation, sliding it to the left is a disk ejection operation.

[Problem to be solved by the invention]

The conventional disk insertion/ejection mechanism described above has several problems. First of all, considering the axial distribution of the pressing force by the driven roller 13, in the mechanism described above, the pressing force is uniform in the axial direction due to the influence of the dimensional accuracy of the guide rail 14 and the dimensional accuracy of the guide rail mounting part. There is a problem that there is no distribution, and in extreme cases there is a risk of one-sided winnings.

Second, since there is a gap between the shaft of the driven roller 13 and the insertion hole for the shaft provided in the guide rail 14, when external force is applied due to vibration etc., this shaft will move between the insertion holes. There is a problem in that this causes an abnormal noise as "chattering" or has an adverse effect on performance.

Thirdly, when moving the guide rail 14 in the release direction to release the pressure contact of the driven roller 13, the elastic member 21 must be driven against the bias tension, and the bias tension moves from the driving roller 12 to the driven roller 13. Since the distance increases as the distance increases, there is a problem in that a large driving torque is required.

[Means to solve the problem]

FIG. 1 is a diagram showing the principle of the present invention. According to this figure, the disk insertion/ejection mechanism of the present invention is a disk insertion/ejection mechanism that holds a disk, inserts it into a recording/playback position, and ejects it from the recording/playback position, and moves the disk 11 in the insertion direction and the ejection direction. a drive roller 12 that rotates to force the
A driven roller 13 for pushing the disk 11 to press it against the driving roller 12, a guide rail 14 for rotatably holding the shaft of the driven roller 13, and the guide rail 1.
In the disk insertion/ejection mechanism, the guide rail 14 has an axis of the driven roller 13. at least two guides in the pressure contact direction and the pressure release direction.
It is characterized by the provision of two guide grooves 15-1 and 15-2, and elastic members 16-1 and 16-2 that bias the shaft of the driven roller 13 while keeping it rotatable in the direction of pressure contact with the guide rail. This is a disk insertion/ejection mechanism.

[For production]

Since the driven roller 13 is biased against the guide rail 14, even if the dimensional accuracy of the guide rail 140 or the dimensional accuracy of the guide rail attachment part is somewhat poor, the driven roller 13 will not move in the axial direction regardless of the dimensional accuracy of the guide rail 140 or the guide rail mounting part. Pressed with uniform force.

In addition, since the driven roller 13 is biased with respect to the guide rail 14, external forces such as vibration may cause the driven roller 13 to
The shafts of the shafts do not move within the guide grooves 15-1 and 15-2, causing no abnormal noise or adversely affecting performance.

Furthermore, since the tension caused by the elastic members 16-1 and 16-2 acts between the guide rail 14 and the driven roller 13, the force required to drive the guide rail 14 is not increased when the pressure contact is released. .

〔Example〕

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

First, a portion corresponding to a specific example of the disk insertion/ejection mechanism according to the present invention will be described. The guide rail 14 is horizontally long when viewed from the disk insertion side (left side in FIG. 2), and defines the insertion position of the disk 11. The drive roller I2 is rotated by a drive means (not shown) in order to insert and remove the disk 11 between it and the driven roller 13. The driven roller 13 has two guide grooves 15- at both ends of its shaft.
1 and 15-2 (15-2 is not shown), and two elastic members 16-1 and 16-2 (16
-2 (not shown) toward the drive roller 12.

When a disk is inserted into the long guide rail 14, it is detected by a first detector (not shown) and the drive roller 12 starts rotating in the disk insertion direction.
The driven roller 13 in contact with it also begins to rotate. At this time, the driven roller 13 and guide rail 14 are
) at the position indicated. When the disk 11 is pushed between the rotating drive roller 12 and 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), a second detector (not shown) detects this and the rotation of the drive roller 12 is stopped. Figure 2 (1
), the driving roller 12 and the driven roller 13 are drawn as if they are in contact with each other, but in reality, after the two rollers have sandwiched the disk 11, the driven roller 13 is drawn as shown in the figure by the thickness of the disk 11. being pushed downwards. At this time, the guide rail 14 cannot move from the position shown in FIG. The pie sparse of the elastic members 16-1 to 16-2 act,
Uniform pressure bonding force can be obtained in the axial direction.

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

The drive lever 52 is provided with a slit 523 including a drive holding slit 54 and a drive slit 55, as well as two slits 521 and 522. These two sleeves) 521 and 522 horizontally guide pins 103 and 104, which are integrated into the housing 100, respectively, and when viewed in the opposite direction, the drive lever 52 slides horizontally with respect to the housing. be able to. A pin 712 (described in detail later) is pushing the drive lever 52 to the left, and an elastic member 5 is pushing the drive lever 52 to the right.
It is 6. The clamper arm 33 and the transmission lever 51 are integrated and can rotate about the rotation shaft 34. A pin 53 is integrally provided on the transmission lever 51, and the pin 53 is connected to a thrift 523 that includes a drive holding slit 54 and a drive slit 55 provided in the drive lever 52.
will be guided to.

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 into a circular hole of the clamper arm 33. The disk clamper 32 has diameters a, b, c (c>a>
It has a shape in which the disks of b) are stacked concentrically, and the relationship with the diameter d of the hole in the clamper arm 33 is a>d>b. In order to fit this disc clamper 32 into the clamper arm 33, a hole with a diameter e and having the relationship a<e is made in the clamper arm 33, and this hole and a hole with a diameter d are connected like a snowman. ing.

When installing, insert the disc clamper 32 into the hole with diameter e.
The disc clamper 32 is inserted into the hole with a diameter of d, and is screwed onto the clamper arm 33 to prevent the disc clamper 32 from returning to the hole with a diameter of e. It is attached to the clamper arm 33.

Next, the operation of the disk clamper drive and holding mechanism will be explained. When the aforementioned second detector detects that the disk 11 has reached the position shown in FIG. 2(1), the rotation of the drive roller 12 stops and at the same time the pin 712 begins to move rightward. In the position shown in FIG. 2(1), the drive lever 52 is pushed by the pin 712 against the piers of the elastic member 56 and is in the position shown in the figure. When the pin 712 moves horizontally to the right in the figure, the drive lever 52 is slid to the right by the bias of the elastic member 56. Then, the pin 53 is guided to the slit of the drive lever 52, so the transmission lever 51 and the clamper arm 33, which are integrated with the pin 53, are lowered, and the disk clamper 32 is also lowered. Figure 2 (2
), the pin 53 is guided by the drive slit 55 and is on its way down.

In FIG. 2(3), the pin 53 is guided to the drive holding slit 54 through the drive slit 55, and as a result, the disk clamper 32 clamps the disk 11 at a predetermined position on the turntable 31. When clamping is completed, the clamper arm 33 will not descend even if pushed any further, so the clamper arm 33 will stop descending, and the pin 53 will stop descending.
The drive arm 52 stops, leaving room for it to be guided into the drive holding slit 54, and therefore the drive arm 52 also stops. However, pin 712 still moves to the right, so pin 712
and the drive arm 52 separates from each other. The purpose of this operation will be described later. The drive holding slit 54 has a pin 5 extending in the radial direction of a circle centered on the rotation axis 34 of the clamper arm.
3. Therefore, even if the disk clamper 32 receives a force that lifts it, the direction in which the pin 53 moves is perpendicular to the direction in which the pin 53 is guided, so the disk clamper 32 will not be lifted by this force. Further, the drive lever 52 is always pulled to the right in the figure by the elastic member 56, and the direction of this force is not perpendicular to the direction in which the pin 53 is guided, so it can move, and since it is not parallel to it, it can move. The force acts as a force that lowers the disk clamper 32 downward. Therefore, the clamping force by the elastic member 56 always acts on the disc clamper 32 and the turntable 3.
1 and 2 are completely clamped together with the magnetic force that attracts each other. Further, since the angle formed between the guide direction of the drive slit 550 and the drive direction of the drive lever 52 is larger than that of the drive holding slit 54, the disc clamper 32
The horizontal displacement of the drive lever 52 required to move the drive lever 52 up and down a predetermined distance is reduced, contributing to miniaturization of the device.

Finally, a disk clamp mechanism for clamping the disk 11 while appropriately holding it will be described.

The main lever 711 has slits 714 and 715, and guides the pins 102 and 105, which are integrated with the housing, in the horizontal direction in the figure. Therefore, like the drive lever 52, this main lever 711 can also slide in the horizontal direction. The main lever 711 is also screwed integrally with a member provided with a rack (not shown), and is driven left and right in the figure by rotating a pinion gear that meshes with the rack using a motor. The aforementioned pin 712 is integral with this main lever 711, and the left and right movement of the main lever 711 moves the drive lever 52 left and right in cooperation with the elastic member 56, and as a result, the disk clamper 32 is moved up and down.

The main lever 711 is also provided with a slit 713, and this slit 713 guides the pin 101 that is integrated with the guide rail 14, so the left and right movement of the main lever 711 also plays the role of moving the guide rail 14 up and down. There is.

As an example, if a slit 713 is 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, Figure 2 (
When the main lever 711 is moved to the right from state 1) to state (2), the guide rail 14 does not move, so the state 12 sandwiched between the drive roller 12 and the driven roller 13 remains almost unchanged, while the disc clamper 32 descends, one end of the disk 11 descends and is held in contact with the fixed support portion 61. When the main lever 711 moves further to the right from the state shown in FIG.
begins to descend, and both ends of the shaft of the driven roller 13 touch the guide groove 15.
-1 and 15-2, the driven roller also begins to fall, and finally the disk 11 separates from the driving roller 12, and is supported by the driven roller 13, the disk clamper 32, and the fixed support part 61, and the other end is Start descending. By appropriately adjusting the inclination of the slit 523 and the inclination of the slit 713, the disk 11 can be guided to the clamp position while being supported at three points with constant force.

When the clamping of the disk 11 is completed, the drive arm 52 becomes immobile and separates from the pin 712 as described above, but the guide rail 14 further descends, thereby causing the driven roller 13 to separate from the disk 11, and finally, as shown in FIG. 3) is reached. This state is detected by a projection (not shown) provided on the main lever 711 pressing a first limit switch (not shown), and the driving motor is stopped.

As above, the operation from disk insertion to completion of clamping has been explained, but since the operation from clamp release to disk ejection is simply the reverse of this, it will not be explained 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 first limit switch, and at the same time as the main lever 711 stops, the driving roller 12 starts rotating in the ejection direction.

〔Effect of the invention〕

As described above, in the disk insertion/ejection mechanism of the present invention, a uniform pressure contact force is obtained by the driven roller, vibration prevention measures are realized, and the driving force required for releasing the pressure contact can be minimized.

Furthermore, the E'Jing 24 required in the conventional mechanism
Since parts such as -1 and 24-2 are not required, the number of parts is reduced and the number of assembly steps is reduced.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the principle of the present invention, FIG. 2 is a diagram showing an embodiment of the invention, and FIG. 3 is a diagram showing a conventional disk insertion/ejection mechanism. In the figure, 11... disk, 12... drive roller,
13... Driven roller, 14... Guide rail, 15-1, 15-2... Guide groove, 16-1, 16-2... Elastic member.

Claims (1)

[Scope of Claims] 1. A disc insertion/ejection mechanism that holds a disc (11) and inserts it into a recording/playback position and ejects it from the recording/playback position, the disc (11) being moved in the insertion direction and in the ejection direction. A drive roller (12) that rotates for movement and a disk (
a driven roller (13) for pressing and pressing the driven roller (11) onto the drive roller (12); a guide rail (14) for rotatably holding the shaft of the driven roller (13);
A disk insertion/ejection system comprising a driving means for driving the guide rail (14) in a pressure contact direction in which the driven roller (13) pushes the disk (11) to bring it into pressure contact with the drive roller (12), and in a pressure release direction in which the pressure contact is released. In the mechanism, the guide rail (14) includes the driven roller (13).
at least two guide grooves (15-1, 15-2) for guiding the shaft of the driven roller (13) in the pressing direction and the pressing release direction, and guiding the shaft of the driven roller (13) in the pressing direction with respect to the guide rail (14). A disk insertion/ejection mechanism characterized by being provided with elastic members (16-1, 16-2) that are biased while maintaining a rotatable state.