JPH0226307B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a disc lifter device for automatically mounting a disc on a turntable in a disc playback device.

"Prior Art" Conventionally, various types of disc playback devices have been provided that can automatically mount a disc on a turntable.

This type of disc playback device is generally configured as follows. First, a tray having a disk mounting section is disposed inside the main body of the device. This tray automatically moves between the open position, where the disk rest is outside the device, and the closed position, where the disk rest is located inside the device, where the signal detection section is located. It is now possible to move to Also, inside the device,
A clamper is provided that fixes the disk placed on the disk placement portion to the turntable when the tray is placed in the closed position.

To play a disc using the above device,
First, a tray opening command is given to the device to bring the tray to the open position, and in this state, the disk is placed on the disk placement section. Next, a tray closing command is given to the device to bring the tray to the closed position and bring the disk to the position of the signal detection section. At this time, the clamper is operated to fix the disk on the turntable. Here, a play command is given to the device to rotate the disk, and the signal detection section reproduces the signal from the disk.

By the way, among the above-mentioned disc playback devices, there are two types: one in which the turntable and its drive source are provided in the tray, and the other in which the turntable and its drive source are provided in the main body of the device.

As an example of the former, for example, as shown in FIGS. 14 and 15, a turntable 3 is placed on the top surface of a tray 2 that is arranged so that it can be pulled out and stored in the device body 1, and the turntable 3 is Some devices are equipped with a motor 4 that serves as a drive source for the turntable 3 inside.

However, the above disc playback device has the disadvantage that the tray 2 becomes large because the motor 4 is built into the tray 2, and the weight of the tray 2 portion becomes large, making it difficult to drive the tray 2. There is a drawback that a large-capacity driving source is required.

As an example of the latter, for example, as shown in FIG. 16, a turntable 5 and its drive source (not shown) are provided in the main body of the device, and a belt 6 that connects the turntable 5 to the drive source may be used. When the tray 7 is moved to the closed position, the tray 7 and the disk 8 placed thereon are moved above the turntable 5. It has been proposed that the turntable 5 is mounted on the disc 8 by being raised by a cam 10 driven by a motor 9.

Since the above-mentioned apparatus does not have a drive source built into the tray, the above-mentioned drawbacks can be eliminated. However, in this device, the power transmission system of the turntable 5 must be configured so that driving force is transmitted even when the turntable 5 moves up and down, which makes the structure of the turntable drive system complicated. There was a drawback.

Therefore, as a device in which the disk is attached to the turntable using a completely different means from the above-mentioned devices and placed near the signal detection section, the turntable and its drive source are placed at a fixed position within the main body of the device. It is conceivable to raise the disk when moving the disk placed on the tray together with the tray, and to lower the disk and attach it to the turntable when the tray is placed in the closed position within the device body. With such a device, all of the above-mentioned drawbacks can be eliminated.

Conventionally, as a disc reproducing apparatus employing the above configuration, a disc reproducing apparatus shown in FIGS. 17 to 19 has been provided in Japanese Patent Laid-Open No. 57-88560.

In FIGS. 17 to 19, reference numeral 11 is a side plate, and a sliding member (tray) 13 having a disc-shaped recording medium mounting portion (disc mounting portion) 12 is mounted on this side plate 11 in the direction of arrows P1 and P2. It is slidably attached. A rack plate 14 is built into the sliding member 13, and the rack plate 14 can move in the directions of arrows P1 and P2 to the extent that a pin 15 fixed thereto can move within the hole 16. A position regulating member (lifter) 18 on which a disc-shaped recording medium (disc) 17 is placed is attached to the sliding member 13 and the rack plate 14 so as to be movable up and down.

The position regulating member 18 has a position regulating portion 19 on a plate-shaped body.
The position regulating part 19 is formed by forming...
The pins 21, 21 are arranged on the lower surface side of the sliding member 13 with the pins 21 and 21 fixed to the sides of the sliding member 13, with the
... are held in the inclined holes 22, 22, ... of the rack plate 14. In this position regulating member 18, when the rack plate 14 moves relative to the sliding member 13 in the directions of arrows P1 and P2, the pin 21 is guided to the inclined hole 22, so that the position regulating part 19 is moved to the placement part. 1
Go up and down within 2.

A pinion gear 23 is disposed below the rack plate 14 in mesh with a rack gear formed on the rack plate 14, and when the pinion gear 23 is rotationally driven, the rack plate 14 and the sliding member 1
3 and the position regulating member 18 are adapted to move in the directions of arrows P1 and P2.

Further, a chucking member holding member 24 is attached to the side plate 11 so as to be movable up and down, and a chucking member 25 is rotatably attached to this holding member 24. A recording medium support section (turntable) 27 that is rotationally driven by a motor 26 is provided below the chucking member 25 .

In the above disc playback device, the recording medium 1
7 is loaded as follows.

First, with the sliding member 13 shown in the figure pulled out in the direction of arrow P2, the recording medium 17 is placed on the position regulating part 19 of the position regulating member 18, and the pinion gear 23 is driven to remove the rack plate 14 and the sliding member. 1
3. Transfer the recording medium 17 together with the position regulating member 18 in the direction of arrow P1. In this case, position regulating member 1
8 holds the recording medium 17 in the raised position. When the recording medium 17 is located above the recording medium support section 27, the sliding member 13 comes into contact with the stopper and stops its movement. After that, the rack plate 14 is attached to the pin 15.
moves in the direction of arrow P1 within the movable range within the hole 16. Here, the position regulating member 18 is lowered by the relative movement of the rack plate 14 with respect to the sliding member 13, thereby lowering the recording medium 17. The recording medium 17 is placed on the recording medium support section 27 during its descent. At this time, the chucking member holding member 24 is lowered in conjunction with the rack plate 14, and the chucking member 25 clamps the recording medium 17 onto the recording medium supporting portion 27. At this point, the rotation of the pinion gear 23 is stopped, and the loading of the recording medium 17 is completed. In this way, the recording medium 17 can be reproduced.

Further, in order to eject the recording medium 17, the pinion 23 is rotated in the opposite direction to that described above to move the rack plate 14 in the direction of arrow P2. Rack board 1
4 moves in the same direction, this rack plate 14 interlocks and the chucking member holding member 24 rises,
When the rack plate 14 moves a certain distance relative to the sliding member 13, the position regulating member 18
is raised, and the recording medium 17 is raised. Then, the sliding member 13 moves in the direction of arrow P2 and reaches the eject position, thus completing the ejection of the recording medium 17.

"Problems to be Solved by the Invention" Incidentally, in the disk playback device shown in FIGS. 17 to 19 above, the elevating device for the recording medium 17, which has the position regulating member 18 as a main component, is as follows. There's a problem.

That is, in this device, the position regulating member 18 is formed in a plate shape, and the position regulating member 1
8 as a whole is configured to rise and fall in the vertical direction. However, in this device, if the position regulating member 18 is twisted or twisted, the position regulating part 19 may get caught in the hole 20, causing malfunction of the position regulating member 18, and recording There is a drawback that the raising and lowering of the medium 17 may be uncertain.

Further, although the position regulating member 18 is formed in a plate shape, most of the plate part essentially covers the recording medium 17.
This position regulating member 18 is not necessary for raising and lowering the device, and the configuration of this position regulating member 18 results in an increase in the size of the device. The large size of the position regulating member 18 has the disadvantage that its drive system also becomes large and complicated.

This invention addresses the problems of uncertain operation, larger size, and complexity of the lifter device for lifting and lowering a disk (recording medium) as described above.

"Means for Solving the Problems" The gist of the present invention is to have a turntable that is fixedly arranged at a predetermined position and rotationally drives the disc during disc playback, a drive source having a cylindrical cam, and a disc mounting section, an open position where the cylindrical cam is driven laterally by a gear formed on the circumferential surface of the cylindrical cam to take the disk in and out of the disk mounting portion;
a tray supported to move linearly between a closed position in which a disk placed on the disk mounting section can be rotationally driven by the turntable; a clamper mounted so as to be movable up and down driven by a cam formed on the end surface of the cylindrical cam at a position where the disk placed on the disk placement section can be clamped to the turntable side; and the disk placement section. In order to raise and lower the disk placed on the disk, a protruding disk holding portion formed on the rotatable free end is inserted into the disk placement portion through a vertical through hole formed in the disk placement portion. a lifter rotatably attached to the side of the lower surface of the tray so that the tray can be moved up and down from the bottom of the tray, and the tray is opened by driving the cylindrical cam. After moving from the position side to the closed position side, the clamper is moved downward, and in conjunction with the movement of the clamper, the lifter is rotated so that its disk holding part retracts into the through hole, and the lifter The disk is lowered from the raised position and the clamper presses the disk toward the turntable, and before the tray moves from the closed position to the open position, the clamper is moved upward to unclamp the disk. and the lifter is rotated in conjunction with the movement of the clamper so that its disk holding part protrudes from the through hole, and the lifter raises the disk from the lowered position. It resides in the disk lifter device of the device.

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 turntable 39 is fixed at a predetermined position and rotates the disc during disc playback. Tray 33
, the disk 40 is transferred between the inside and outside of the device main body 31, and the disk 40 is transferred between the closed position shown by a solid line in the figure and the open position where it is pulled out from the opening 36 to the outside of the device main body 31. Supported to move in a straight line. Lifters 41, 41 are attached to this tray 33 to raise the disk 40 when it is transferred and to lower it onto the turntable 39 when the disk 40 is positioned above the turntable 39. There is.
The clamper 34 chucks the disk 40 placed on the tray 33 onto the turntable 39 when the tray 33 is in the closed position.

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 the vicinity of the rear end to the rear end. A notch 53 is formed in the bottom wall 52 of the disk mounting portion 46 from the center toward the rear. This notch 53 is connected to the disk mounting portion 46.
The notch 45 is opened through the peripheral wall 54 of the notch 45 . In addition, the bottom wall portion 52 and the peripheral wall portion 54 include
Holes 55, 55, . . . that penetrate in the vertical direction are formed 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, as shown in Figure 20 A and Figure 20 B,
Lifter main body 58 and claws 59, 59 connected to the front and rear ends of the lifter main body so as to protrude laterally.
(disc holding section). 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, 59 are connected so as to intersect with the main wall part 60 at right angles. Cylindrical shafts 63 and 64 are formed on the walls 61 and 62 on the axis passing through the sides of the claws 59 and 59,
Furthermore, a cylindrical engagement protrusion 65 that protrudes rearward and a pressed protrusion 66 that protrudes upward are formed on the rear wall portion 62. The claws 59, 59 have a rectangular shape in plan view, and the height gradually increases upward from the center in the longitudinal direction. 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, the lifter 41 has its claw 5 as shown in FIGS. 14 and 21.
9, 59 are located in the holes 55, 55, and the shafts 63,
64 is a support wall 6 formed on the back surface of the tray 33.
7 and 67 so as to extend in the front-rear direction while being inserted into the grooves 68 and 68. 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 manner is rotatable about the shafts 63 and 64, and the upper surfaces of the claws 59 and 59 located in the holes 55 and 55 are placed in the disk mounting portion 46. Okibe 4
It is designed to be able to move up and down by moving in and out from the bottom surface 46a of 6. In this case, when the claw 59 of the lifter 41 is rotated in the direction of raising it, the pressed protrusion 66 is pressed against the upper wall portion 7 of the tray 33, as shown in FIG.
3 into a hole 74 formed in the hole 74. Note that the rotation range of the lifter 41 is limited to the main wall portion 6.
The range is limited to a range from a position where the side edge of the rear wall 62 abuts a wall 76 formed on the tray 33 to a position where the side edge of the rear wall 62 abuts the upper wall 73 of the tray 33. The lifter 41 is urged by a leaf spring 77 (biasing member) in the direction in which the claw 59 moves upward. That is, as shown in FIGS. 4 and 7, an intermediate portion of a leaf spring 77 is fixed to the back side of the tray 33 with a screw 78, and one end of this leaf spring 77 is formed on the tray 33. At the same time, the other end is locked to the engagement protrusion 65 of the lifter 41. Based on this configuration, the claw 5 of the lifter 41
9 is always biased 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 is moved in a straight line between a position where the disk mounting section 46 is exposed to the outside of the device main body 31 when the disk mounting section 46 is pulled out. In this case, the turntable section 39 is
As shown in FIG. 6, 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 lifted up by the lifter 41 as shown by the two-dot chain line in FIG. In this case, the disk 40 is the turntable 3.
There is no contact with 9.

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 steel 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 configuration, the clamper 34 can be moved by the arrows C and D shown in FIGS. 2 and 3.
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 has a cam follower 102 that projects laterally on the right side of its tip, and a convex portion 103 that projects downward and extends in the left-right direction at a predetermined distance forward position from the shaft 99. It 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 cam body to be described later. The convex portion 103 engages with a recess 104 formed in the upper wall portion 73 of the tray 33 when the tray 33 is placed in the closed position, thereby locking 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 10
5 pushes the pressed protrusion 66 of the lifter 41 downward when the tray 33 is in the closed position.
The claw 59 of No. 1 is placed at the lower limit position shown by the solid line in FIG. Such a clamper 34 has a first
3, a coil spring 108 interposed between a holding protrusion 106 integrally formed on the lower surface of the rear end of the main body 90 and a holding body 107 fixed to the chassis 32 biased in the direction.

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, the chassis 32 includes a tray
A motor 111 (drive source) for driving the clamper is attached, and a shaft 11 is mounted so as to protrude further upward.
2 to 114 are fixed. A shaft 114 is located on the side of the cam follower 102, and a cam body 115 is mounted on this shaft 114. The rotational force of the motor 111 is applied to a pinion gear 1 fixed to a motor shaft 116 projecting upward from the chassis 32.
The signal is transmitted from 17 to the cam body 115 via drive gears 118 and 119 which are made up of large and small gears mounted on shafts 112 and 113. As shown in FIGS. 11 and 12, the cam body 115 is attached to a disk-shaped main wall 120 with a mounting wall 1 at the center thereof.
21, and an annular wall portion 122, 1 is formed on the lower surface thereof.
23 and a stopper 124, and a cam portion 125 is formed on the periphery 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 cam body 115 rotates in the direction of arrow E, when the gear 128 reaches the rack gear 50, they engage, and as the cam body 115 rotates, the tray 33 is pulled forward. There is.

The cam portion 125 is an annular wall portion having different heights, and controls the height of the tip of the clamper 34 by driving the cam follower 102.
The height of the cam portion 125 will be explained with reference to FIGS. 11 and 12. The area indicated by the reference numeral 131 is a flat portion at the same height as the upper surface of the main wall portion 120, and the area 132 adjacent to this is a slope portion that gradually becomes higher 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 cam body 115 rotates, the cam portion 125
As a result, the cam follower 102 moves up and down, and the front end of the clamper 34 moves up and down. Here, when the cam follower 102 comes into contact with the flat part 131 of the cam part 125, the chuck plate 92 of the clamper 34 is placed in a position where it chucks the disk 40 against the turntable 39, as shown by the solid line in FIG. When abutting against the portion 133, the tip of the clamper 34 is placed at the upper limit position shown by the two-dot chain line. The shape of the cam portion 125 and the gear 12 described above
8. 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 124 of the cam body 115, and these pins 135 and 136 are used to activate a limit switch mounted on the chassis 32 when the cam body 115 is rotated. 137 and comes into contact with actuator 138 . Limit switch 137
constitutes part of a control circuit that controls the drive of the motor 111, and generates a trigger signal for stopping the motor 111. The above control circuit is controlled by arrows E and F on the cam body 115.
The movement of the pins 135 and 136 with the rotation in the direction causes the actuator 138 to close to the contact point 139 or 1.
40, the motor 111 is controlled so that the cam body 115 is reversely rotated to bring the actuator 138 to the center position, and then the rotation of the cam body 115 is stopped. This control circuit is provided on a printed circuit board 141 disposed on the lower surface side of the motors 37 and 111 together with a control circuit for controlling the motor 37 for driving the disk.
The rotation range of the cam body 115 is mechanically limited by the stopper 124 of the cam body 115 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 where its tip is lowered by the cam follower 102 coming into contact with the flat part 131 of the cam part 125, the chuck plate 92 comes into contact with the turntable 39, and the pressing piece 105 is brought into contact with the lifter. 41 pressed projection 66
is pressed down, and the convex portion 103 is in a state engaged with the concave portion 104 of the tray 33. Here, assuming that the disk 40 has already been inserted into the disk mounting portion 46, the chuck plate 92 clamps the disk 40 to the turntable 39. Also,
At this time, the lifter 41 moves the claw 59 onto the disk 4 as the pressed protrusion 66 is pushed down.
It is placed at the lower limit position below 0. Also, the convex part 1
03 into the recess 104, the tray 33 is locked in that position. Further, the actuator 138 of the limit switch 137 is
Contacts 139, 14 as shown by solid lines in Figure 13a
It is placed at the center position between 0 and 0.

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. Motor 111 rotates cam body 115 in the direction of arrow E via pinion gear 117 and drive gears 118 and 119. When the cam body 115 rotates in the same direction, the cam follower 102 which had been in contact with the flat part 131 rides on the inclined part 132 as shown in FIG. 13b, and the inclined part 132 raises the cam follower 102. and cam body 11
The cam portion 125 of No. 5 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, the clamp of the disk 40 by the chuck plate 92 is released, and the pressing piece 105 is raised and the convex portion 103 and the concave portion 104 are The engagement 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, causing the disc 40 to move as shown by the two-dot chain line in FIG. Raise as shown.

When the disk 40 is raised to the upper limit position as described above, the gear 128 of the cam body 115 meshes with the rack gear 50 of the tray 33 at this point. Here, the tray 33 is the gear 12 of the cam body 115.
8 moves forward as the rack gear 50 is pushed forward, and finally the disk mounting portion 4
6 is moved to a position where it is exposed to the outside of the device main body 31. When moving this tray 33, the disk 4
0 is supported at the upper limit position by the claw 59 of the lifter 41 and is moved without contacting the turntable 39. When the tray 33 moves to the above position, the pin 135 of the cam body 115 comes into contact with the actuator 138 of the limit switch 137, and this pin 135 connects the actuator 138 to the contact point 139 as shown by the two-dot chain line in FIG. 13c.
bring it into contact with. Actuator 138 is contact point 13
9, these actuators 138,
The control circuit, which includes contact 139 as part of its circuit, reverses motor 111, rotates cam body 115 slightly in the direction of arrow F, returns actuator 138 to the neutral position, and then stops motor 111 and rotates cam body 115. stop the movement of That is, tray 3
3 is a rack gear 50 on the side of the tray 33;
The cam body 115 engages with the gear 128 to horizontally move (go in and out), and the rack gear 50
Then, the tray 33 stops when the gear 128 of the cam body 115 disengages. After that, the cam body 115 continues to rotate, and the cam follower 102 riding on the cam surface 125 at the top of the cam body 115 descends, and the pressing piece 105 pushes the pressed piece 66, causing the lifter 41 to rotate and pawl. 59 to descend,
The disk 40 mounted on the claw 59 is transferred to the turntable 39 and clamped by the chuck plate 92. Also, at this time, the convex portion 103 is the concave portion 1
04, and the tray 33 is locked so that it cannot be moved. When removing the disk 40, the reverse operation is performed. In this case, when the tray 33 is pulled out most forward, the stopper 124 of the cam body 115 comes into contact with the stop pin 142,
Excessive rotation of the cam body 115 is mechanically prevented.

After the tray 33 is pulled out 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 disk mounting portion 46 coincides with the center of the turntable 39, and the center of the disk 40 raised by the lifter 41 within this disk placement portion 46 also coincides with the center of the turntable 39. turntable 3
It coincides with the center of 9. From this point on, the cam follower 102 of the clamper 34 is moved to the 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. Also, at this time, the convex portion 103 engages with the concave portion 104, and the tray 33 is locked in its movement function. At this point, the cam follower 102 is located on the flat portion 131 of the cam portion 125. The pin 136 of the cam body 115 then contacts the actuator 138 of the limit switch 137, and the actuator 138 contacts the contact 140 as shown in FIG. 13a. As a result, the control circuit reverses the motor 111 so that the cam body 115
is rotated slightly in the direction of arrow E, and when the actuator 138 is returned to the neutral position, the motor 111 is stopped. 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 that is chucked 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.

In this embodiment, since the urging member for urging the lifter 41 is formed of the leaf spring 77, the urging force can be easily changed by increasing or decreasing the number of leaf springs.

[Effects of the Invention] According to the present invention, in a disc playback device in which a lifter for raising and lowering the disc is attached to a tray for transporting the disc, the disc is raised and lowered by rotating the lifter. The only factor that impedes the smooth operation of the lifter is the rotational resistance of the lifter's rotational fulcrum.
The lifter can be raised and lowered extremely smoothly. Since the lifter operates smoothly, the disk can be moved up and down as expected with certainty. In addition, by rotating the lifter, the amount of movement on the drive mechanism side can be reduced compared to the amount of movement at the rotation end, and the cam body alone can move the tray in and out and move the disk. Since the lifter can be moved up and down, the drive system of the lifter can be downsized and simplified. Therefore, according to the present invention, smooth loading and disk lifting and lowering operations during ejection can be realized with a simple configuration.

[Brief explanation of drawings]

1 to 13 and FIGS. 20A to 21 are diagrams for explaining one embodiment of the present invention, and FIG. 1 shows the main parts of a disc playback device to which the present invention is applied. The plan view of Figure 2 is the same as Figure 1.
Linear view, Figure 3 is Figure 1 - Linear sectional view, Figure 4
The figure is a partially cutaway view from FIG. 1, FIG. 5 is an enlarged sectional view from FIG. 1, FIG. 6 is an enlarged sectional view from FIG. The bottom view, FIG. 8 is a sectional view taken along the line XII-XII of FIG. 7, FIG. 9 is an explanatory view showing the lifter installation state, FIG. FIG. 12 is an enlarged view of the cam body part in FIG. 1, FIGS. 13 a to c are explanatory diagrams of the operation of the disc playback device, and FIG. 14 is an example of a conventional disc playback device. 15 is a side sectional view of the tray portion of the device shown in FIG. 14; FIG. 16 is a side sectional view showing another example of the conventional disc playback device; FIG.
The figure is a side view showing another example of a conventional disc playback device, FIG. 18 is a sectional view taken from FIG. 17,
FIG. 19 is a perspective view of the position regulating member of the device shown in FIG. 17, FIG. 20A is a top perspective view of the lifter, and FIG.
FIG. 0B is a bottom perspective view of the lifter, and FIG. 21 is a perspective view of the tray. 33...tray, 39...turntable, 40...
Disc, 41... Lifter, 46... Disk mounting section, 59... Disc holding section (claw), 77... Biasing member (leaf spring).

Claims (1)

[Scope of Claims] 1. A turntable that is fixedly arranged at a predetermined position and rotates the disk during disk playback, a drive source having a cylindrical cam, and a disk mounting portion formed on the circumferential surface of the cylindrical cam. an open position in which the disk is placed in and out of the disk mounting section by being laterally driven by a gear; and a closed position in which the disk placed in the disk mounting section can be rotationally driven by the turntable. a tray supported so as to move linearly between the positions; and a tray supported to move linearly between the positions, and the tray placed in the closed position in the position where the disk placed on the disk mounting portion can be clamped to the turntable side; A clamper is driven by a cam formed on the end face of the cylindrical cam and is mounted to be movable up and down, and a protrusion is formed on the free end of the cylindrical cam to raise and lower the disk placed on the disk mounting section. The disk holding section is rotatable to the side of the lower surface of the tray so that it can move in and out of the bottom surface of the disk mounting section in the vertical direction through a vertical through hole formed in the disk mounting section. and a lifter attached to the clamper, and by driving the cylindrical cam, after the tray moves from the open position side to the closed position side, the clamper is moved downward, and the clamper is moved downward. Interlockingly, the lifter is rotated so that its disk holding portion retracts into the through hole, the lifter lowers the disk from the raised position, the clamper presses the disk toward the turntable, and Before the tray moves from the closed position to the open position, the clamper is moved upward to release the disk clamp, and in conjunction with the movement of the clamper, the lifter is moved so that its disk holding portion protrudes from the through hole. 1. A disk lifter device for a disk playback device, characterized in that the disk lifter device is configured to rotate the disk so that the lifter raises the disk from a lowered position. 2. A disk lifter device for a disk playback device according to claim 1, further comprising a biasing device for biasing the lifter toward a raised position. 3. The biasing member is a leaf spring, and the leaf spring has one end locked to the lifter, the other end locked to the tray, and the middle part fixed to the tray. A disk lifter device for a disk playback device according to claim 2.