JPS61216155A - Automatic disk loading device for disk reproducing device - Google Patents

Abstract

PURPOSE:To simplify the constitution of an automatic disk loading device by forming a limit switch actuating part to an intermediate driver (cam) in the form of a single unit. CONSTITUTION:The pins 135 and 136 serving as action parts are provided on the lower surface of a wall part 124 of a cam body 115. These pins 135 and 136 have contacts with an actuator 138 of a limit switch 137 attached onto a chassis 32. The switch 137 serves as a part of a control circuit for a motor 111 and produces a trigger signal to stop the drive of the motor 111. The control circuit gives reverse revolutions to the cam 115 to move the actuator 138 to its neutral position when the actuator 138 touches a contact 139 or 140 owing to the shifts of both pins 135 and 136 caused by the revolutions of the cam 115 toward arrow makes E and F. Then the control part controls the motor 111 to stop the revolutions of the cam 115.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to an automatic disc loading device for automatically loading a disc onto a turntable in a disc playback device.

``Prior Art'' Automating the loading of discs in a disc playback device improves the operability of the device and also protects the discs and the device since the discs are always loaded in a prescribed procedure. This has the advantage that it is possible to always accurately mount the disk at a predetermined location. From this point of view, in digital audio disc playback devices, which have been making remarkable progress in recent years, automation of disc loading is being carried out in line with the ability to obtain high electrical performance.

2. Description of the Related Art Conventionally, a device shown in FIG. 14 is known as a disk playback device equipped with an automatic disk loading device.

In FIG. 14, a ladle 1 is a chassis, and a tray 2 is supported on the top la of the chassis 1 so as to be movable in the directions of arrows PI and P2. By moving the tray 2 in the above direction, the disc 3 is moved from the open position outside the device to the closed position M (position where the disc can be played) inside the device.
The disk 3 is moved from the closed position to the open position, and vice versa, and is driven by a drive source (not shown). Also, on the top of chassis 1,
A micro switch 5 works with an engagement pin 4 provided on the tray 2 to detect the open position of the tray 2, and a micro switch 5 works with a cam body 6 interlocked with the tray 2 to detect the closed position of the tray 2. A switch 7 is provided.

To play a disc using the disc playback device H described above, a command to open the tray 2 is given to the device to move the tray 2 in the direction of arrow P2 and bring the tray 2 to the open position. When the tray 2 reaches the open position, the engagement pin 4 comes into contact with the microswitch 5, and the switch 5 detects the open position of the tray 2, thereby stopping the movement of the tray 2.

At this point, place disc 3 on tray 2, and place tray 2 on the device.
A closing command is given to move this tray 2 to arrow P11.
When L and -2 move in the direction 1 and reach the closed position, that is, the position where the disc can be played, the cam body 6 interlocked with the tray 2 displaces the actuator of the microswitch 7, which causes the switch 7 to close the tray 2. When the closed position of the tray 2 is detected, the movement of the tray 2 is stopped. At this point, the disc 3 is mounted on a turntable (not shown). Then, if a disk reproduction command is given to the device, the disk 3 rotates together with the turntable, and a pickup head (not shown) reads the signal recorded on the disk 3, and the disk 3 is reproduced.

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By the way, the above-mentioned disc playback apparatus is configured so that the limit position (open position, closed position) of the tray 2, in which the disc 3 is automatically loaded, is detected by the microswitch 5.7. Therefore, in this device, in order to operate the microswitches 5 and 7, there are two
f; 1ji switch operation parts must be provided;
This has the disadvantage that the configuration of the device becomes complicated. Also, the above device V? Now, set the limit position of tray 2 to tray 2.
Tray 2 is detected on both left and right sides in the direction of movement.
When there is a wobble in the left-right direction, the detection position of the tray 2 by the switches 5 and 7 does not reach the perfect position, resulting in a disadvantage that the detection accuracy of the open position and the closed position of the tray 2 deteriorates.

This invention addresses the problems of the complicated configuration of the automatic disc loading device of the disc playback device as described above and the deterioration of the detection accuracy when detecting the limit position of the tray.

[Means for Solving the Problems] The present invention has a disc mounting section, and has an open position for loading and unloading the disc from the disc mounting section, and an open position for loading and unloading the disc from the disc mounting section, and an open position for loading and unloading the disc from the disc mounting section. A tray is supported so as to be movable between a closed position and a closed position where it is rotated by a turntable, and when this tray is in the closed position, a disk placed on the disk mounting section 16 is placed on the turntable. Driven by a clamper that clamps against the clamp and a drive source, -・ ・ −・ 14
, 1 An automatic disc loading device for a disc playback device comprising an intermediate drive body that drives the tray and the clamper in synchronization, and a limit switch that controls the open position and closed position of the tray, The present invention is characterized in that an actuating portion for actuating the limit switch is integrally formed with the intermediate drive body.

"Example" Embodiments of the present invention will be described below with reference to the drawings.

The drawings show one embodiment of the present invention, and in FIGS. 1 to 3, reference numeral 31 indicates the device body, 32 a chassis provided with a projector in the device body 31, and 33 a chassis 3.
A tray supported on 2, 34 is a clamper.

The chassis 32 is a rectangular plate, and is horizontally arranged with its front edge close to an opening 36 formed in a front panel 35 of the device body 31. A motor 37 for disk R<1ift is fixed to the lower surface of this chassis 32. As shown in FIGS. 3 and 6, the motor 37 has a rotating shaft 38 and an upper surface 4 of the chassis 32.
I: To jj! ': It is fixed to the chassis 32 in the protruding state yΦ, and a turntable 39 is fixed to the rotations lt and l138. 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 it is pulled out from the first part 36 to the outside of the device main body 31. Move between! !
Ilj is supported. This tray 33 is equipped with lifters 41, 41 that raise the disc 40 when it is transferred and lower it onto the turntable 39 when the disc 40 is positioned above the turntable 39. J is being kicked.

When the tray 33 is in the closed position, the clamper 34
The disk 40 placed on the tray 33 is chucked onto the turntable 39.

The details and arrangement of the tray 33 are shown in FIGS. 1, 2,
It is shown in FIGS. 4-9. As shown in these figures, the tray 33 is a rectangular plate-shaped body with a constant thickness and a notch 45 formed at the rear. This tray 33 is formed with a disk mounting section 46 consisting of four parts having a circular shape in plan view on the upper surface side of the creation section, and notches 47 and 47 are formed on both left and right sides of the disk mounting section 46. is formed.

Further, a rack gear 5o is formed on the outer surface of the right side wall portion 48 from the vicinity of the notch portion 47 to the rear end. Also,
A notch 53 is formed in the bottom wall 52 of the disk mounting portion 46 from the center toward the rear. This notch 5
3 penetrates the peripheral wall portion 54 of the disk mounting portion 46 and opens into the notch portion 45 . In addition, holes 55° 55, .

A decorative board 57 is fixed to the front surface of the tray 33 formed as described above, and a cover 41.4 is fixed to the back surface of the tray 33.
1 is installed. The lifter 41 has a lid main body 58.
and claws 59 and 59 that are connected to the front and rear ends of the lid body so as to project laterally. The lifter main body 58 has a long main part 60 on which claws 59 and 59 are connected.
A front wall portion 61 and a rear wall portion 62 are provided in succession at the front and rear ends of the
H to form shafts 63 and 64, and furthermore, an engagement protrusion 65 that protrudes rearward on the rear wall portion 62 and a pressed protrusion 6 that protrudes upward.
6. 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.
1 positions the claw 59.59 in the hole 55°55,
The shafts 63, 64 are inserted into grooves 68, 68 of a support wall 67, 67 formed on the Jt surface of the tray 33, and are arranged 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 lid 41 attached to the tray 33 in this way is rotatable around the shafts 63 and 64,
The upper surfaces of the claws 59, 59 located in the holes 55, 55 can move up and down within the disk mounting section 46 by moving in and out of the bottom surface 46a of the mounting section 46. In this case, when the claw 59 of the slide 41 is rotated in the upward direction, the pressed protrusion 66 moves into the hole 74 formed in the upper wall 73 of the tray 33, as shown in FIG. It is designed to enter. The rotation range of the lifter 41 ranges from a position where the side end of the main wall 60 contacts a wall 76 formed on the tray 33 to a position where the side end of the rear wall 62 contacts the upper wall 73 of the tray 33. range). Ah-,-i. Hey, Yu. 9.
ga41!1. A leaf spring 77 urges M59 in the upward direction. That is, Figures 4 and 7
As shown in the figure, the middle part 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 locked to a rib 78 formed on the tray 33, and the same Other end beam lid 41
It is locked to the engagement protrusion 65 of. Under this configuration,
The claw 59 of the IJ7 taffeta is always urged to the upper limit position. The above is arranged on the right side of the tray 33 or the lid 4.
Explanation of the installation condition of 1; However, it is installed on the left side and 7
The tray 41 also has a structure similar to that described above, and is attached to the tray 33 several times, and is held up by a leaf spring 77.

Tray 3 with lifters 41, 41 attached as described above
3 is placed on the chassis 32 and is movable in the front and rear directions (in the directions of arrows A and B in FIG. 1).

In other words, the tray 33 can move smoothly in the front and back direction, and is in the closed position shown in the figure
(a position where the center of the disc mounting part 46 coincides with the center of the turntable 39) and an open position Wl (a position If where it is pulled out and the disc mounting part 46 is exposed to the outside of the device main body 31). ). In this case, the turntable 39 protrudes upward from the bottom wall 52 of the tray 33 as shown in FIG. 6, but because the notch 53 is formed, the turntable 39 does not come into contact with the moving tray 33. Furthermore, 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 double dotted line in FIG. , in this case, the disc 40 is 1-f-7', 99
．． □Oh, Yo, it's so big.

The details and arrangement of the clamper 34 are shown in FIGS. 1-4. As shown in these figures, clamper 3
The main body 90 of No. 4 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 &92 is formed in the shape of an inner disc, and an &N ball 93 is integrally fitted into a hole formed in the center of the chuck &92. This chuck plate 92 is configured such that an engaging portion 94 formed on its peripheral edge engages with an engaging g (S95) carved into the main body 90 to prevent it from falling downward. The cylindrical plate 96 is inserted into the screw 97 so as to cover approximately half of the hole 91.
It has been taken away by 97. With this configuration, the chuck plate 92 cannot be pulled out even upwardly. On the other hand, protruding wall portions 98 are formed on the lower surface of the rear end of the main body 90 at 2tA positions on the left and right, respectively, and a shaft 99 that protrudes laterally is formed on the protruding wall portions 98. 411h99 is supported by a support member 100 formed on the chassis 32 by outsert molding, and is supported by the shafts 63 and 64 of the lid 41 as described above.
It is rotatably supported by a support structure similar to that of . With this configuration, the clamper 34 is rotatable in the directions of arrows C and D shown in FIG. 2 and 3M. In this case, when the clamper 34 is rotated in the direction of arrow C, the center of the chuck plate 92 is rotated toward the center of the turntable 39. The main body 90 also has a cam follower 102 projecting laterally on the right side of the distal end thereof.
is formed, and a convex portion 1 protrudes downward and extends in the left-right direction at a portion 14 in front of the shaft 99 by a predetermined distance.
03 is formed. The distal end of the cam follower 102 protrudes from the outer surface of the side wall 48 of the tray 33 toward the tray 1, and its vertical position is controlled by a cam body to be described later. The convex portions 103 engage with four portions 104 formed on the upper wall portion 73 of the tray 33 to lock the tray 33 in that position when the tray 33 is placed in the closed 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 suppressing piece 105 pushes the pressed protrusion 66 of the lifter 41 downward when the tray 33 is in the closed position, and places the claw 59 of the lifter 41 at the lower limit position shown by the solid line in FIG. As shown in FIG. 3, the ramper 34 includes 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.
It is biased in the direction of arrow C by a coil spring 108 interposed between.

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 FIG. 1 and FIG.
It is shown in FIG. Chassis 32 as shown
A motor 111 (motor source) for driving the tray clamper is attached to the shaft 1 so as to protrude further upward.
12 to 114 are fixed. 1llll11114 is located on the side of the cam 7 orer 102, and a cam body 115 (intermediate drive body) is attached to this shaft 114.

The rotational force of the motor 111 is transmitted from a pinion gear 117 fixed to a motor shaft 116 projecting upward from the chassis 32 to the cam body 115 via drive gears 118 and 119, which are made up of large and small gears and are mounted on shafts 112 and 113. It has become so.

As shown in FIGS. 11 and 12, the cam body 115 includes a disk-shaped main wall 120, a mounting wall 121 formed at the center thereof, and annular walls 122, 123 and a stopper 124 on the lower surface thereof. A cam portion 125 is formed on the periphery of the upper surface of the cam portion.

At this time, the outer peripheral surface of the wall portion 122 is a gear 126,
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. Cam body 1
15 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 out forward.

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 7 op-a 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 1
32 is a slope that gradually becomes higher in the direction of arrow G, and furthermore,! l! The continuous region 133 is a flat portion that is higher than the flat portion 131 by a dimension e2. Here, the cam 7 lower 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 follower 102 moves up and down following the cam part 125, and the front end side 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 at the position (lower limit position N) where the disc 40 is clamped to the turntable 39, as shown by the solid line in FIG. When the clamper 34 is placed in the same position and comes into contact with the flat portion 133, the tip of the clamper 34 is placed at the upper limit position shown by the two-dot chain line. Shape of the cam portion 125 and gear 1
28, 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 (actuating portions) are formed on the lower surface of the wall portion 124 of the cam body 115, and these pins 135 and 136 are placed on the chassis 32 when the cam body 115 is rotated. Installed limit switch 13
7 actuator 138. The limit switch 137 constitutes a part of the control circuit that controls the drive of the motor 111.
This generates a trigger signal to stop the 11. The control circuit is indicated by arrow E on the cam body 115.

Pin 135 due to rotation in the F direction. ．． When the actuator 138 comes into contact with the contact point 139 or 140 due to the movement of the cam body 136, the cam body 115 is reversely rotated to bring the actuator 138 to the neutral position, and then the cam body 115
The motor 111 is controlled so that the rotation of the motor 111 is stopped. This control circuit operates the motor 3 for driving the disk.
A control circuit for controlling the motors 7 and 7 is provided on a printed circuit board 141 disposed on the lower surface side of the motors 37 and 111.

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 operated by operating various buttons (not shown) such as a tray open button, a tray close button, a play button, and a stop button. .

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

The positions of the parts indicated by solid lines in FIGS. 1 to 6, FIG. 10, and FIG. 12 indicate the state in which the tray 33 is housed in the device main body 31, that is, the state in which the tray 33 is in the closed position. There is. 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. Then, the clamper 34 is in the state in which the leading part thereof is lowered by the cam follower 102 abutting against the flat part 131 of the cam part 125, the chuck plate 92 abuts against the turntable 39, and the pressing piece 1
Pressed protrusion 66 of 05 gari 7 ta 41. is pressed 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 clamps the disk 40 to the turntable 39. At this time, the claw 59 of the cutter 41 is placed at the lower limit below the disk 40 due to the pressed projection 66 being pushed downward. In addition, the convex portion 103 is the concave portion 10
4, the tray 33 is locked into position. Further, the actuator 138 of the limit switch 137 is placed at a neutral position between the contacts 139 and 140, as shown by the solid line in FIG. 16(a).

Here, when a new disc is inserted from the outside of the device body 31 and the disc is to be played back, the tray release button is first pressed to start the motor 111.

The motor 111 has a pinion gear 117 and a drive gear 1.
The cam body 115 is rotated in the direction of the arrow E via 18 and 119. When the cam body 115 rotates in the same direction, the cam 7 lower 102, which had been in contact with the flat part 131, moves to the first
As shown in FIG. 3(b), the cam follower 102 rides on the inclined part 132, and the inclined part 132 raises the cam follower 102. The cam portion 125 of the cam body 115 allows the cam 7 op 102 to reach the flat portion 133. In this way cam 7 op a 1
02 is raised, the clamper 34 rotates in the direction of the arrow, the clamp of the disk 40 by the chuck plate 92 is released, the pressing piece 105 is raised, and the engagement between the convex part 103 and the concave part 104 is released. . At this point, as the pressing piece 105 rises, the leaf spring 7
7 rotates around the shafts 63 and 64, and the claw 59
is raised, which causes the disk 40 to rise as shown by the two-dot chain line in FIG.

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 moves forward as the gear 128 of the 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.

When the tray 33 is moved, the disk 40 is supported at the upper limit position by the claws 59 of the stopper 41, so that the disk 40 is moved without contacting the turntable 39. When the tray 33 moves to the above position, the bottle 135 of the cam body 115 comes into contact with the actuator 138 of the limit switch 137, and this bottle 135 moves to the position shown in FIG.
The actuator 138 is connected to the contact point 139 as shown by the dashed line.
bring it into contact with. When the actuator 138 comes into contact with the contact 139, the control circuit that includes the actuator 138 and the contact 139 as a part of the circuit reverses the motor 111, slightly rotates the cam body 115 in the direction of arrow F, and places the actuator 138 in neutral. return to position, and motor 11
1 to stop the movement of the cam body 115. In addition,
In this case, when the tray 33 is pulled out most forward, the stopper 124 of the cam body 115 is connected to the stop bin 142.
The cam body 115 is mechanically prevented from over-rotating.

Thus, after the tray 33 is pulled out forward as described above, the disk in the tray placement 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 mounting portion 40 coincides with the center of the turn tape/L/39, and the disk being lifted by the lifter 41 within this tray M ffi portion 40 The center of 40 is also turntable 3
It coincides with the center of 9. From this point on, the cam 7 oror 102 of the clamper 34 is connected to the inclined portion 13 of the cam portion 125.
Move to 2 and start descending.

Then, the cam 7 roller 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 is
Push the pressed protrusion 66 and rotate the shutter 41 to release the claw 59.
is lowered to bring this pawl 59 to the lower limit position. The disk 40 is transferred from the claw 59 to the turntable 39 and is clamped by the chuck plate 92. Further, 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 7 lower 102 is located on the flat portion 131 of the cam portion 125. Then, the pin 136 of the cam body 115 contacts the actuator 138 of the limit switch 137, and this actuator 138 contacts the contact point 140 as shown in FIG. 1
15 slightly in the direction of arrow E, and
38 is returned to the neutral position, the motor 111 is stopped. In this way, the mounting of the disk 40 is completed.

When the play button is pressed in this state, the motor 37 rotates, the disc 40 clamped to the turntable 39 rotates, and the signal recorded on this disc 40 is reproduced by a signal reproducing device (not shown). Ru.

"Effects of the Invention" According to the present invention, the tray for transferring the disk and the clamper for clamping the disk against the turntable are configured to be driven by an intermediate drive body, and the open position and closed position of the tray are limited. Since the actuating part for actuating the limit switch is integrally formed with the intermediate drive body, it is possible to arrange the limit switch in one place. It is not necessary to provide two switch actuating parts on the tray, simplifying the configuration, and detecting the open and closed positions of the tray without worrying about the supporting state of the tray, so these positions can be detected with high precision. This effect can be obtained.

[Brief explanation of drawings]

1 to 13 are diagrams illustrating an embodiment of the present invention, in which FIG. 1 is a plan view of the main parts of a disc playback device to which the present invention is applied, and FIG. Linear view, 3rd
Figure 1 is a cross-sectional view of Figure 1. Figure 4 is a partially cutaway view of Figure 1. Figure 5 is an enlarged sectional view of Figure IV81. Fig. 1 is an enlarged sectional view taken along the line -, Fig. 7 is a bottom view of a portion of the tray, Fig. 8 is a sectional view taken along the xi-n line of Fig. 9, and Fig. 9 is an explanation M1 showing the installation state of the beam 7. Fig. 10 is a sectional view taken along the line XFJ of 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,
Figures 13(a) to (01 are operation dI of the disc playback device)
? 14 is a plan view of a disc playback device equipped with a conventional automatic disc loading device. 33...Tray, 34...Clamper,
39... Turntable, 40... Disc, 46... Disc mounting section, 111.
... Drive source (motor), 115 ... Intermediate moving body (cam body), 135, 136 ... Actuation part (pin), 137 ... Limit switch , 13
8... Actuator, 139.140...
···contact.

Claims (4)

[Claims] (1) It has a disc mounting part, and has two positions: an open position where a disc is taken in and taken out from the disc mounting part, and a closed position where the disc placed on the disc mounting part is rotated by a turntable. a tray movably supported between the trays; a clamper that clamps the disk placed on the disk mounting section to the turntable when the tray is in the closed position; and a clamper that is driven by a drive source. , an intermediate drive body that drives the tray and the clamper in synchronization, and a limit switch that controls an open position and a closed position of the tray, and an actuating unit that causes the intermediate drive body to actuate the limit switch. What is claimed is: 1. An automatic disk loading device for a disk playback device, characterized in that the device is integrally formed with the above. (2) A limit switch for controlling the upper limit position and lower limit position of the clamper is provided, and an operating part for operating the limit switch for controlling the upper limit position and lower limit position of the clamper is integrally formed in the intermediate drive body. An automatic disc loading device for a disc playback device according to claim 1, characterized in that: (3) The actuating part that actuates the limit switch for controlling the open position and closed position of the tray is also used as the actuating part that actuates the limit switch for controlling the upper limit position and lower limit position of the clamper. An automatic disc loading device for a disc playback device as claimed in claim 2. (4) The limit switch has a state in which the actuator contacts one contact to control the open position of the tray, and a state in which the actuator contacts another contact to control the closed position of the tray; The actuator is configured to be in a neutral position in which it does not contact any of the contacts, and the actuator and each contact form part of a control circuit that controls the drive source, and this control circuit A patent claim characterized in that, when the actuator contacts any of the contacts, the drive source is controlled to operate the intermediate drive body so that the actuator returns the actuator to a neutral position. An automatic disk loading device for a disk playback device according to item 1.