JPH0432461B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a disc clamp device for fixing a disc to a turntable in a disc playback device.

``Prior Art'' Conventionally, as a disc clamping device for this type of disc playback device, the one shown in FIGS. 14 and 15 (provided in Japanese Patent Application Laid-Open No. 57-88560) is known.

14 and 15, reference numeral 1 in the figures indicates a side plate, and a sliding member 2 is attached to this side plate 1 so as to be slidable in the directions of arrows P1 and P2. A rack plate 3 is built into the sliding member 2, and the rack plate 3 can move in the directions of arrows P1 and P2 within the range in which a pin 4 fixed thereto can move within the hole 5. A position regulating member 7 on which a disk-shaped recording medium 6 is placed is attached to the sliding member 2 and the rack plate 3 so as to be vertically movable. Furthermore, cam plates 8A and 8B are fixed to the rack plate 3. A pinion gear 9 is disposed below the rack plate 3 and is engaged with a rack formed on the rack plate 3. When the pinion gear 9 is rotationally driven, the rack plate 3, the sliding member 2 and the position control The member 7 is adapted to move in the directions of arrows P1 and P2.

Also, a chucking member holding member 1 is provided on the side plate 1.
5 is attached, and this holding member 15 can move up and down within the range in which a pin 17 formed in the side plate 1 can move relative to each other within a hole 16 formed therein. A chucking member 18 is rotatably attached to this holding member 15.
A recording medium support section 20 that is rotationally driven by a motor 19 is provided below the chucking member 18 . A pin 21 is formed on the holding member 15, and this pin 21 is connected to the rack plate 3 in the direction of the arrow P.
When it is moved in the 1 and P2 directions, it is guided by the inclined surface of the cam plate 8A or 8B.

In the above disc playback device, the recording medium 6
The loading is done as follows.

First, with the sliding member 2 shown in the figure pulled out in the direction of arrow P2, the recording medium 6 is placed on the position regulating member 7, and the pinion gear 9 is driven to remove the rack plate 3, the sliding member 2, and the position regulating member. 7, the recording medium 6 is transported in the direction of arrow P1. When the recording medium 6 approaches the recording medium support section 20, the pin 21 of the holding member 15 engages with the cam plate 8A, and the pin 21 is guided by the inclined surface of the cam plate 8A, so that the holding member 15 is moved. descend. Further, at this time, the position regulating member 7 is also lowered by a moving mechanism (not shown).
Then, when the recording medium 6 reaches above the recording medium support section 20, the chucking member 18, which descends together with the holding member 15, clamps the recording medium 6 to the recording medium support section 20. In this way, the recording medium 6
is fixed on the recording medium support section 20 by a tracking member 18. At this point, the pinion gear 9 stops rotating, and the loading of the recording medium 6 is completed. In this state, the recording medium 6 can be reproduced.

To eject the recording medium 6, the pinion gear 9 is rotated in the opposite direction to the above and moved in the direction of arrow P2 of the rack plate 3. When the rack plate 3 moves in the same direction, the pin 21 of the holding member 15 engages with the cam plate 8B.
By being guided by the inclined surface of the holding member 15
is raised, and then the chucking member 18, sliding member 2, and other parts move in the reverse order to the above, and the recording medium 6 moves to the initial position in the direction of arrow P2, completing ejection.

"Problems to be Solved by the Invention" By the way, the disk clamping device of the disk playback device described above moves the rack plate 3 in the directions of arrows P1 and P2 and moves the cam plates 8A and 8B in the same direction. The recording medium 6 is clamped by moving the pin 21 up and down by the inclined surfaces of the cam plates 8A and 8B and moving the chucking member holding member 15 up and down. However, in this lever device, as the operation of clamping the recording medium 6, that is, the operation of moving the holding member 15 up and down, the cam plates 8A and 8B are moved linearly in the directions of arrows P1 and P2, so the movement area of the cam plates 8A and 8B is The drawback is that the device requires a long area, and the space efficiency of the device is extremely poor. In addition, cam plates 8A, 8
Since the rack plate 3 is interposed in the movement of B, there is a drawback that the structure of the device is complicated.

Furthermore, this device is configured so that the pin 21 is guided by the inclined surface of the cam plate 8A when the holding member 15 is lowered, and is guided by the inclined surface of the cam plate 8B when the holding member 15 is raised, so that the pin 21 is guided in the lowered state. A certain time lag occurs when the movement of the holding member 15 to move upward occurs, and the downward movement and upward movement of the holding member 15 are not reversible, and the holding member 15 and the sliding member 2 do not interlock accurately. It was hot. Regarding this point, it is possible to reduce the above-mentioned time lag by narrowing the interval between the inclined surfaces of the cam plates 8A and 8B, but in that case, it is difficult for the pin 21 to enter between the above-mentioned inclined surfaces. Then, cam plate 8A,
There is an inconvenience that malfunction occurs between 8B and pin 21.

The problems to be solved by this invention are poor space efficiency, complexity of the structure, and poor interlocking between the member that clamps the disk (recording medium) and the member that transports the disk in the disk clamp device as described above. It's bad.

``Means for Solving the Problems'' This invention provides an open position where a disk is taken in and out of a disk mounting part, and a closed position in which a disk placed on the disk mounting part is rotationally driven by a turntable. a tray supported movably between positions; a chuck plate for clamping a disk placed on the disk mounting portion to the turntable when the tray is in the closed position; and an integrated cam follower. and a rotary cam with which the cam follower abuts, and the shape of the cam surface of the rotary cam changes as described above when the rotary cam rotates and the position of the cam surface that abuts the cam follower changes sequentially. A rotary cam body configured such that the maximum proximity distance between the turntable and the chuck plate sequentially changes to any desired value according to the amount of rotation of the rotary cam, and a chuck plate of the clamper that is connected to the turntable. The clamper is characterized by comprising: a biasing device that constantly biases the clamper in a direction such that it approaches the clamper; and an interlocking device that links the movement of the tray to the rotation of the rotary cam body. It is.

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

The drawings show one embodiment of the invention,
In FIGS. 1 to 3, reference numeral 31 denotes a main body of the device, 32 a chassis fixed within the main body 31 of the device, 33 a tray supported on the chassis 32,
34 is a clamper.

The chassis 32 is a rectangular plate,
It is arranged horizontally with its front edge close to an opening 36 formed in a front panel 35 of the main body 31 of the device. A disk drive motor 37 is fixed to the lower surface of this chassis 32. As shown in FIGS. 3 and 6, the motor 37 is fixed to the chassis 32 with its rotating shaft 38 protruding toward the upper surface of the chassis 32, and a turntable 39 is fixed to the rotating shaft 38. has been done. The tray 33 is for transporting the disk 40 between the inside and outside of the device main body 31, and has two positions: a closed position shown by a solid line in the figure and an open position where the disk 40 is pulled out from the opening 36 to the outside of the device main body 31. supported so that it can be moved between When transferring the disk 40 to this tray 33, the disk is raised,
Lifters 41, 41 are attached to lower the disk onto the turntable 39 when the disk 40 is positioned above the turntable 39. The clamper 34 clamps the disk 4 placed on the tray 33 when the tray 33 is in the closed position.
0 to the turntable 39.

The details and arrangement of the tray 33 are shown in FIG.
It is shown in FIGS. 2 and 4 to 9. As shown in these figures, the tray 33 has a notch 4 at the rear.
5 is a rectangular plate-like body having a constant thickness. This tray 33 has a disk mounting portion 46 formed on the upper surface side of its front half, which is a recessed portion having a circular shape in plan view, and notches 47, 47 are formed on both left and right sides of the disk mounting portion 46. ing. Further, a notch 47 is provided on the outer surface of the right side wall portion 48.
A rack gear 50 is formed from near the rear end. In addition, the bottom wall portion 5 of the disk mounting portion 46
2 has a notch 53 formed from its center toward the rear. This notch 53 penetrates the peripheral wall 54 of the disk mounting portion 46 and opens into the notch 45 . In addition, the bottom wall portion 52 and the peripheral wall portion 5
4 is formed with holes 55, 55, . . . for arranging the claws of the lifters 41, 41.

A decorative plate 57 is fixed to the front surface of the tray 33 formed as described above, and lifters 41, 41 are attached to the back surface thereof. Lifter 4
1 includes a lifter main body 58, a claw 59 connected to the front and rear ends of the lifter main body so as to protrude laterally;
It consists of 59. The lifter main body 58 has a front wall part 61 and a rear wall part 62 connected to the front and rear ends of a long main wall part 60 on which the claws 59 and 59 are connected, and the claws 59 and 59 are connected to these wall parts 61 and 62. Shafts 63 and 64 are formed on the axis passing through the sides, and an engaging projection 65 that projects rearward and a pressed projection 66 that projects upward are formed on the rear wall portion 62.
Here, the lifters 41 are disposed on the left and right sides of the tray 33, and the structures on the left and right sides are symmetrical.

To explain the installation state of the lifter 41 disposed on the right side of the tray 33, as shown in FIG.
5, 55, and the shafts 63, 64 are placed in the tray 3.
Groove 6 of support walls 67, 67 formed on the back surface of 3
8, 68 so as to extend in the front-rear direction. As shown in FIGS. 7 and 9, the shaft 64 is locked by an annular plate 72 fixed to a support 69 formed on the back surface of the tray 33 with a screw 71 through a washer 70. . The shaft 63 is also locked in the groove 68 by the same means as described above. The lifter 41 attached to the tray 33 in this way has a shaft 63,
It is rotatable around 64, and holes 55, 55
The upper surfaces of the claws 59, 59 located inside can move up and down within the disk placement section 46 by moving in and out of the bottom surface 46a of the disk placement section 46. In this case, when the claw 59 of the lifter 41 is rotated in the direction of raising it, the pressed protrusion 66 is moved into the hole formed in the upper wall part 73 of the tray 33, as shown in FIG.
4. Note that the rotation range of the lifter 41 is such that the side end of the main wall portion 60 is
The side end of the rear wall portion 62 is limited to a range from a position where it abuts the wall portion 76 formed in the tray 33 to an area where the side end of the rear wall portion 62 abuts the upper wall portion 73 of the tray 33. And this lifter 4
1 is biased by a leaf spring 77 in the direction in which the claw 59 rises. That is, the fourth
As shown in FIG. 7, the middle part of a leaf spring 77 is fixed to the back side of the tray 33 by a screw 78, and one end of this leaf spring 77 is attached to a rib 78 formed on the tray 33. The other end is engaged with the engagement protrusion 6 of the lifter 41.
It is locked at 5. With this configuration, the claw 59 of the lifter 41 is always urged to the upper limit position. The above is an explanation of the mounting state of the lifter 41 disposed on the right side of the tray 33, but the lifter 41 disposed on the left side is also attached to the tray 33 with the same structure as above, and is supported by the leaf spring 77. It is energized.

The tray 33 to which the lifters 41, 41 are attached as described above is placed on the chassis 32 and is movable in the front and back direction (in the directions of arrows A and B in FIG. 1). That is, tray 33
can move smoothly in the front-rear direction, and can be moved between the closed position shown in the figure (the position where it is housed in the device main body 31 and the center of the disk mounting part 46 coincides with the center of the turntable 39) and the open position (the front position). The disk mounting section 46 can be moved between the main body 31 and the position where the disk mounting section 46 is exposed to the outside of the device main body 31. In this case, the turntable 39 is
As shown in the figure, it protrudes upward from the bottom wall 52 of the tray 33, but because the notch 53 is formed, it does not come into contact with the moving tray 33. Further, when the disk 40 is placed on the disk placement portion 46 of the moving tray 33, the disk 40 is raised by the lifter 41 as shown by the two-dot chain line in FIG. In this case, the disk 40 does not come into contact with the turntable 39.

The details and arrangement of the clamper 34 are shown in FIGS. 1-4. As shown in these figures, the main body 90 of the clamper 34 is formed into a plate shape, and a hole 91 is formed at the tip thereof. A chuck plate 92 for clamping the disk 40 to the turntable 39 is inserted into the hole 91. The chuck plate 92 is formed into a disk shape, and a copper ball 93 is integrally fitted into a hole formed in the center of the chuck plate 92. This chuck plate 92 is prevented from falling downward by having an engaging portion 94 formed on its peripheral portion engaging with an engaging portion 95 formed on the main body 90. A cover plate 96 is attached to the upper surface of the main body 90 by screws 97, 97 so as to cover approximately half of the hole 91. With this configuration, the chuck plate 92 cannot escape even upwardly. On the other hand, the main body 90
Projecting wall portions 98 are formed on the lower surface of the rear end at two locations on the left and right, respectively, and a shaft 99 that projects laterally is formed on the projecting wall portion 98. The shaft 99 is supported by a support member 100 formed on the chassis 32 by outsert molding, and is rotatably supported with a support structure similar to that of the shafts 63 and 64 of the lifter 41 described above. With this structure, the clamper 34 can be moved by the arrows C and D shown in FIGS.
It can be rotated freely in the direction. In this case, the clamper 34
The center of the chuck plate 92 rotates toward the center of the turntable 39 when the chuck plate 92 is rotated in the direction of arrow C. Further, the main body 90 is integrally formed with a cam follower 102 that protrudes laterally on the right side of the tip thereof, and protrudes downward by a predetermined distance forward from the shaft 99 and extends in the left-right direction. A convex portion 103 is formed. The tip of the cam follower 102 protrudes laterally from the outer surface of the side wall 48 of the tray 33, and its vertical position is controlled by a rotating cam body to be described later. The convex portion 103 allows the tray 3 to be placed in the closed position.
The tray 33 is engaged with a recess 104 formed in the upper wall portion 73 of the tray 3 to lock the tray 33 in that position. Furthermore, a pressing piece 105 is formed on the lower surface of the main body 90, as shown in FIGS. 2 and 4. This pressing piece 105 pushes the pressed projection 66 of the lifter 41 downward to place the claw 59 of the lifter 41 at the lower limit position shown by the solid line in FIG. 5 when the tray 33 is in the closed position. Such a clamper 34 has a main body 9 as shown in FIGS. 1 and 3.
A holding protrusion 106 integrally formed on the lower surface of the rear end of the
and a holder 107 fixed to the chassis 32.
is urged in the direction of arrow C, that is, in a direction toward the turntable 39.

The tray 33 and clamper 34 described above are driven by a drive mechanism 110 provided on the chassis 32. Details of the drive mechanism 110 are shown in FIGS. 1 and 10 to 12. As shown in the figure, a motor 111 (drive source) for driving the tray clamper is attached to the chassis 32, and a shaft 112 is attached to the chassis 32 so as to protrude upward.
~114 are fixed. The shaft 114 is located on the side of the cam follower 102, and this shaft 114
A rotary cam body 115 is attached to 14. The rotational force of the motor 111 is transmitted to the rotating cam body 115 from a pinion gear 117 fixed to a motor shaft 116 protruding above the chassis 32 via drive gears 118 and 119, which are made up of large and small gears, mounted on shafts 112 and 113. It is becoming more and more common. As shown in FIGS. 11 and 12, the rotating cam body 115 has a disk-shaped main wall 120, a mounting wall 121 formed at the center thereof, and cylindrical walls 122, 123 on the lower surface thereof. A stopper 124 is formed, and a rotating cam portion 125 is formed on the peripheral edge of the upper surface thereof. At this time, the outer peripheral surface of the wall portion 122 is a gear 126, and this gear 126 meshes with a small gear of the drive gear 119 so that rotational force is transmitted. Further, a gear 128 (pinion gear) is formed on the outer peripheral surface of the wall portion 123 in a range indicated by the reference numeral 127. When the rotary cam body 115 rotates in the direction of arrow E, the gear 128 engages with the rack gear 50 so that the tray 33 is pulled out forward as the rotary cam body 115 rotates. It's summery. In this embodiment, the gear 128 formed on the rotary cam body 115 and the rack gear 50 formed on the tray 33 constitute an interlocking tool according to the present invention.

The rotary cam portion 125 is a cylindrical wall portion formed such that the protrusion height of its upper end surface in the axial direction changes in the circumferential direction, and
is driven to control the height of the tip of the clamper 34. The height of the rotary cam portion 125 will be explained with reference to FIGS. 11 and 12. The region indicated by the reference numeral 131 is a flat portion having the same height as the upper surface of the main wall portion 120, and the adjacent region Reference numeral 132 is a slope portion that gradually increases in height in the direction of arrow G, and a region 133 that is continuous with this slope portion is a flat portion that is higher than the flat portion 131 by a dimension l ₂ . Here, the cam follower 102 is pressed against the cam portion 125 from above by the clamper 34 being urged by the coil spring 108 . Therefore, when the rotating cam body 115 rotates, the cam follower 102 moves up and down following the rotating cam part 125, and the front end side of the clamper 34 moves up and down. Here, cam follower 10
2 comes into contact with the flat part 131 of the rotary cam part 125, the chuck plate 92 of the clamper 34 is placed in a position to clamp the disc 40 to the turntable 39, as shown by the solid line in FIG.
3, the tip of the clamper 34 is placed at the upper limit position shown by the two-dot chain line. Shape of the above rotating cam portion 125 and gear 128
The formation position of the notch 129 is determined so that the tray 33 and the clamper 34 are driven at a constant timing.

Further, pins 135 and 136 are formed on the lower surface of the wall portion 123 of the rotating cam body 115,
These pins 135 and 136 are connected to the rotating cam body 115.
The actuator 13 of the limit switch 137 mounted on the chassis 32 when the
8. The limit switch 137 constitutes a part of a control circuit that controls the drive of the motor 111.
This generates a trigger signal to stop the system. The above control circuit controls pins 135 and 136 as the rotating cam body 115 rotates in the directions of arrows E and F.
Actuator 138 is moved to contact point 13 by movement of
9 or 140, the rotating cam body 11
5 is reversely rotated to bring the actuator 138 to the neutral position, and then the motor 111 is controlled so that the rotating cam body 115 stops rotating. This control circuit is connected to the motors 37 and 1 together with the control circuit that controls the motor 37 for driving the disk.
11 is provided on a printed circuit board 141 disposed on the lower surface side. The rotation range of the rotary cam body 115 is mechanically limited by its stopper 124 coming into contact with a stop pin 142 fixed to the chassis 32.

In the above configuration, the control circuit that controls the motors 37 and 111 is activated by operating various buttons (not shown) such as a tray open button, a tray close button, a play button, and a stop button. ing.

Next, the operation of the disc playback device configured as described above will be explained.

The positions of the parts shown in solid lines in FIGS. 1 to 6, FIG. 10, and FIG.
is in the closed position. In this state, the center of the disk mounting portion 46 of the tray 33 is positioned to coincide with the center of the turntable 39. The clamper 34 is in a state in which its tip is lowered by the cam follower 102 coming into contact with the flat part 131 of the rotary cam part 125, the chuck plate 92 coming into contact with the turntable 39, and the pressing piece 105 Pressed projection 6 of lifter 41
6 is pushed down, and the convex portion 103 is in a state engaged with the concave portion 104 of the tray 33. Here, if the disk 40 has already been inserted into the disk mounting section 46, the chuck plate 92 will be placed on the disk 40.
is clamped to a turntable 39. Further, at this time, the claw 59 of the lifter 41 is placed at the lower limit position below the disk 40 due to the pressed projection 66 being pushed downward. Furthermore, the tray 33 is locked in that position by the projection 103 engaging with the recess 104. Also,
Actuator 138 of limit switch 137
The contact points 139, as shown by solid lines in FIG. 13a,
140 in a neutral position.

If you want to install a new disk from outside the device main body 31 and play it, first,
Press the tray release button to start the motor 111. The motor 111 is connected to the rotating cam body 1 via a pinion gear 117 and drive gears 118 and 119.
15 in the direction of arrow E. Rotating cam body 11
5 rotates in the same direction, the flat part 131
The cam follower 102 that was in contact with the
As shown in FIG.
32 connects the cam follower 102 to the coil spring 1
It is raised against the urging force of 08. The rotating cam portion 125 of the rotating cam body 115 causes the cam follower 102 to reach the flat portion 133. When the cam follower 102 is raised in this manner, the clamper 34 rotates in the direction of arrow D, and the chuck plate 92
The clamp of the disk 40 is released, and the pressing piece 105 rises, and the convex part 103 and the concave part 104
The engagement with is released. As the pressing piece 105 rises, the lifter 41 rotates around the shafts 63 and 64 due to the force of the leaf spring 77, and the pawl 59 rises, which moves the disc 40 to the fifth position.
Raise it as shown by the two-dot chain line in the figure.

When the disk 40 is raised to the upper limit position as described above, the gear 128 of the rotating cam body 115 meshes with the rack gear 50 of the tray 33 at this point. Here, the tray 33 moves forward as the gear 128 of the rotary cam body 115 pushes the rack gear 50 forward, and finally moves to a position where the disk mounting section 46 is exposed to the outside of the device main body 31. . During this movement of the tray 33, the disk 40 is supported at the upper limit position by the claws 59 of the lifter 41, so that the disk 40 is moved without contacting the turntable 39. When the tray 33 moves to the above position, the pin 135 of the rotary cam body 115 comes into contact with the actuator 138 of the limit switch 137, and this pin 135 moves to the position shown in FIG.
The actuator 138 is brought into contact with the contact point 139 as shown by the two-dot chain line. Actuator 138
When the actuator 138 and the contact 139 are part of the circuit, the control circuit reverses the motor 111 and rotates the rotating cam body 1.
15 slightly in the direction of arrow F to return the actuator 138 to the neutral position, and then
1 to stop the movement of the rotating cam body 115. In this case, when the tray 33 is pulled out most forward, the stopper 124 of the rotary cam body 115 comes into contact with the stop pin 142, and excessive rotation of the rotary cam body 115 is mechanically prevented.

Thus, after the tray 33 is pulled forward as described above, the disk in the disk mounting section 46 is replaced with a new disk. Then, push the tray closing button to move the tray 33 to the closing position in the reverse order of the above. Immediately after the tray 33 reaches the closed position, the center of the tray placement section 40 coincides with the center of the turntable 39, and the center of the disk 40 raised by the lifter 41 within the tray placement section 40 also coincides with the center of the turntable 39. It coincides with the center of the turntable 39. From this point on, the cam follower 102 of the clamper 34 moves to the rotating cam portion 125.
The vehicle moves to the inclined part 132 and starts descending.

Thus, the cam follower 102 descends smoothly, and the chuck plate 92 slowly descends to clamp the disk 40 to the turntable 39. At this time, the pressing piece 105 presses the pressed projection 66, rotates the lifter 41, lowers the pawl 59, and brings the pawl 59 to the lower limit position. Disc 40 is claw 5
9 to the turntable 39, and is clamped by the chuck plate 92. At this time, the convex portion 103 engages with the concave portion 104, and the tray 33 is locked so that it cannot be moved. At this point, the cam follower 102 is located on the flat portion 131 of the rotating cam portion 125. And the pin 136 of the rotating cam body 115
is the actuator 13 of the limit switch 137
8, this actuator 138
Contact 140 is contacted as shown in Figure a. As a result, the control circuit reverses the motor 111, slightly rotates the rotary cam body 115 in the direction of arrow E, and stops the motor 111 when the actuator 138 is returned to the neutral position. In this way, the mounting of the disk 40 is completed.

If you press the play button in this state, the motor 37 rotates, the disk 40 clamped to the turntable 39 rotates, and the signal recorded on this disk 40 is reproduced by a signal reproducing device (not shown). will be played.

As explained above, the disk clamping device of this disk playback device includes a rotating cam body 115 formed with a cylindrical wall portion 123 and a cylindrical rotating cam portion 125, and a gear 128 formed on the wall portion 123. 33, the cam follower 102 of the clamper 34 is always brought into contact with the rotary cam part 125, and the tray 33 and the clamper 34 are moved at a constant timing by rotating the rotary cam body 115. Because of this structure, the structure of the drive section of the tray 33 and the clamper 34 is extremely simple, space efficient, and the drive section is extremely compact. Also,
When adjusting the interlocking timing between the tray 33 and the clamper 34, the adjustment can be made at two locations: between the tray 33 and the rotary cam body 115, and between the clamper 34 and the rotary cam body 115. It has a high degree of accuracy and can achieve extremely accurate interlock timing. Further, in this way, the operation of the clamper 34 is performed in conjunction with the operation of the rotary cam body 115, and the movement of the tray 33 into and out is also performed in conjunction with the rotary cam body 115 via the interlocking tools (rack gear 50 and gear 128). Because it is carried out in conjunction with
The operations of the tray 33 and the clamper 34 are reliably linked, and high reliability can be obtained. In this case, since the clamper 34 is always urged against the rotating cam body 115, the operation timing of the clamper 34 is determined by the shape of the upper surface (cam surface) of the rotating cam portion 125 formed on the rotating cam body 115. Further, in the embodiment, since the rotating cam portion 125 has a cylindrical shape, the above-mentioned operation timing can be easily selected by simply selecting its circumferential height. be able to. Furthermore, the clamper 34 (cam follower 1
02) is always urged to come into contact with the rotating cam body 115, and as a result, the turntable 39
Since the structure restricts the proximity distance to the turntable 39, even if an unexpected external force due to vibration or the like is applied to the clamper 34, there is no possibility that the clamper 34 (chuck plate 92) will come into contact with the turntable 39. Extremely high reliability can be obtained.

According to the invention described in ``Effects of the Invention'', in a disk playback device that includes a tray for transferring a disk and a clamper for clamping the disk transferred by the tray to a turntable, the clamper is rotated by the rotation of a rotating cam body. Since the clamper is configured to be driven by the clamper and the clamper is brought into contact with the rotary cam body by the biasing device, the configuration of the disk clamper device can be simplified, and the rotary cam as a member for driving the clamper can be simplified. The body does not move in a straight line as in the conventional case, so space efficiency is good and the device can be configured compactly. In addition, the tray is driven by a rotating cam body via an interlocking tool, and the clamper is always brought into contact with the rotating cam body using a biasing tool, so the clamper can be accurately linked to the movement of the tray. Therefore, high reliability can be ensured for operations that require delicate and important timing in relation to the disk mounting operation and the clamping operation. Furthermore, the clamper (cam follower) is kept in constant contact with the rotating cam body by biasing it toward the turntable, and the vertical movement of the clamper is controlled by the shape of the cam surface that is always in contact with the cam. Depending on the shape of the surface, the driven movement of the clamper can be arbitrarily defined, and it can be freely adapted to situations where delicate timing control of the disk clamp is required. Further, since the shape of the cam portion of the rotating cam body can be easily machined, the operation timing of the clamper can be easily set and the maintenance of the clamper operation can be easily performed, and as a result, the operation timing of the clamper can be determined accurately. In addition, the clamper (cam follower) is always urged to come into contact with the rotating cam body, and this restricts the proximity distance to the turntable, so there is no risk of unexpected external forces such as vibrations being applied to the clamper. Also, there is no risk that the clamper (chuck plate) will come into contact with the turntable, and extremely high reliability can be obtained.

[Brief explanation of drawings]

1 to 13 are diagrams for explaining one embodiment of the present invention, in which FIG. 1 is a plan view of main parts of a disc playback device to which the present invention is applied, and FIG.
The figure is Figure 1 - Linear view, Figure 3 is Figure 1 -
Linear cross-sectional view, Figure 4 is partially cut away Figure 1-
5 is an enlarged sectional view of FIG. 1, FIG. 6 is an enlarged sectional view of FIG. 1, and 7
The figure is a bottom view of the tray part, Figure 8 is Figure 7 XII-XII
9 is an explanatory diagram showing the installation state of the lifter, FIG. 10 is a sectional view taken from FIG. 1,
Fig. 11 is an enlarged view of the main part of Fig. 10, Fig. 12 is an enlarged view of the cam body part of Fig. 1, Figs. FIG. 15 is a side view of a disc playback device equipped with a clamp device, and FIG. 15 is a sectional view taken along the line of FIG. 14. 33...tray, 34...clamper, 39...
Turntable, 40...Disc, 46...Disk mounting portion, 50...Rack gear, 92...Chick board, 102...Cam follower, 108...
Biasing tool (coil spring), 111... Drive source (motor), 115... Rotating cam body, 125... Rotating cam portion (cam surface component), 128... Gear.
(The above symbols 50 and 128 are interlocking tool components.)

Claims (1)

[Claims] 1. It has a disk mounting section, and has an open position where a disk is taken in and taken out from the disk mounting section, and a disk placed on the disk mounting section is rotated by a turntable. The tray has a tray supported movably between the closed position and a chuck plate that clamps the disk placed on the disk mounting portion to the turntable when the tray is in the closed position, and a cam follower. It has an integrally formed clamper and a rotating cam that the cam follower abuts,
The shape of the cam surface of this rotary cam is such that when the rotary cam rotates and the position of the cam surface in contact with the cam follower changes sequentially, the maximum proximity distance between the turntable and the chuck plate depends on the amount of rotation of the rotary cam. a rotating cam body configured to sequentially change to an arbitrary desired value; and a biasing device that constantly biases the clamper in a direction such that the chuck plate of the clamper approaches the turntable. A disc clamping device for a disc playback device, comprising: an interlocking tool that interlocks movement of the tray with rotation of the rotary cam body. 2. The rotary cam portion of the rotary cam body is formed in a cylindrical shape, and the protrusion height of one end surface in the axial direction changes in the circumferential direction,
2. A disk clamping device for a disk playback device according to claim 1, wherein said cam follower is configured to abut said one end surface of said rotating cam portion.