JPH0445155Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" This invention relates to an automatic disk loading device for automatically loading a disk onto a turntable in a disk playback device.

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

Conventionally, this type of disc playback device has been provided with the following configuration.

First, a tray having a disk mounting section is disposed within the main body of the apparatus. This tray can be moved between an open position where the disk rest is located outside the main body of the device and a closed position where the disk rest is located inside the main body of the device where the turntable is installed. It's summery. A rack gear is formed on the outer surface of the tray in the direction of movement of the tray. A pinion gear that meshes with the above-mentioned rack gear is disposed in the main body of the apparatus, and this pinion gear is rotated by a motor.

To load a disk into this device, first turn on the motor and rotate the pinion gear, which moves the rack gear to bring the tray from the open position, exposing the disk mounting part of the tray to the outside of the device body. let In this state, the disk is placed on the disk placement section. The motor is then reversed to bring the tray to the closed position. When the tray reaches the closed position, a disk is placed on the turntable and held on the turntable by a clamper. Thus, the disc becomes playable.

"Problems to be Solved by the Invention" In the disk playback device described above, the structure of the tray drive section is such that the rack gear and pinion gear are disengaged when the tray is placed in the closed position. This is desirable. That is, when the tray is in the closed position and the disk is mounted on the turntable, it is necessary to keep the tray for transferring the disk in that position to prevent the tray from moving unexpectedly.
However, if the pinion gear rotates, the tray will move, so the rack gear and pinion gear should be disengaged in the above situation. If the rack gear and pinion gear are disengaged when the tray reaches the closed position, when the pinion gear is rotated afterwards,
The rotational force of this pinion gear can be used to drive a member such as a clamper.

By the way, in the above disc reproducing apparatus, if the rack gear and pinion gear are disengaged when the tray is placed in the closed position, the following problem occurs. That is,
In the above device, once the rack gear and pinion gear are disengaged, when the pinion gear is subsequently tried to mesh with the rack gear, the teeth of the pinion gear do not mesh smoothly with the leading teeth of the rack gear due to timing discrepancies. Therefore, the initial meshing of each gear may not occur as determined. In such a case, the amount of tray feeding may be insufficient as a result, and the tray may be insufficiently drawn in or ejected.

The purpose of this invention is to prevent the tray from moving when it is closed (blind movement), to reliably regulate its position, and to mesh the rack gear and pinion gear smoothly in their proper positions.

"Means for solving the problem" In this invention, a protrusion is formed at the front leading tooth position of the rack gear of the tray, which protrudes more than the tip of the tooth of the rear rack gear that follows, and the tray is in the closed position. At this time, the positional relationship between the tray and the pinion gear is set such that the protrusion is located behind the point of contact between the imaginary straight line of movement of the rack gear and the imaginary circle of movement of the pinion gear; After reaching the closed position, it is configured to be able to further rotate in the opposite direction by a predetermined amount, and when the over-rotation occurs, the arc portion that faces the virtual straight line of movement of the rack gear is a notch where the pinion gear is cut out. and this notch consists of a leading notch that allows the protrusion of the rack gear to pass through, and a rear notch after that,
The amount of the radial notch of this rear notch is set smaller than the amount of protrusion of the protrusion of the rack gear, so that after the tray reaches the closed position from the open position, the protrusion of the rack gear becomes smaller than the protrusion of the pinion gear. By contacting the rear notch, blind movement of the tray in the opening direction is prevented, and when the pinion gear is rotated in the forward direction to move the tray from the closed position to the open position, the protrusion of the rack gear The present invention is characterized in that by hooking the leading tooth of the pinion gear, both gears are brought into mesh according to predetermined conditions.

"Function" In the automatic disk loading device of this invention,
When the tray is mounted, when the tray is moved to the closed position by the engagement between the rack gear and the pinion gear, the engagement between the rack gear and the pinion gear is released by the notch of the pinion gear. At this time, the protruding part of the rack gear is located behind the point of contact between the imaginary straight line of movement of the rack gear and the imaginary circle of movement of the pinion gear, so even if the tray tries to move forward, the protruding part will hit the rear notch of the pinion gear. Movement is restricted by contact, and the tray stops at that position.

On the other hand, when moving the tray to the open position, when the pinion gear is reversed, the protrusion formed at the front leading tooth position of the rack gear is engaged with the leading notch of the pinion gear, and the leading tooth of the pinion gear is Since the protrusion is hooked from the rear to drive the rack gear, both gears mesh smoothly in the correct position.

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

The drawing shows an example of this 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. The motor 37, as shown in FIGS. 3, 4, and 9,
The rotary shaft 38 is fixed to the chassis 32 in a state of protruding toward the upper surface of the chassis 32, and a turntable 39 is fixed to the rotary shaft 38. The tray 33 connects the disk 40 to the device body 31.
It is supported so that it can be moved between the closed position shown by the 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. . This tray 33
Lifters 41, 41 are attached to lifters 41, 41 for raising the disk 40 when the disk 40 is being transferred, and for lowering the disk onto the turntable 39 when the disk 40 is located above the turntable 39. 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 5 to 13. 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 has a disk mounting portion 46 formed on the upper surface side of its front half, which is a concave portion having a circular shape in plan view.
Notches 47, 47 are formed on both left and right sides. Further, at the lower ends of the left and right side wall parts 48, 48, rail parts 49, 4 projecting outward, respectively.
9 is formed. Further, a rack gear 50 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. In addition, the right side wall portion 4
8, a protrusion 51 is formed at the leading position of the rack gear 50 to protrude laterally from the tips of the teeth of the rack gear 50. Note that this protrusion 51 will be explained in detail later. Furthermore, the disk mounting section 4
A notch 53 is formed in the bottom wall 52 of No. 6 from the center toward the rear. This notch 53
pierces the peripheral wall portion 54 of the disk mounting portion 46 and opens into the notch portion 45 . In addition, the bottom wall portion 52
Holes 55, 55, . . . for arranging the claws of the lifters 41, 41 are formed in the peripheral wall portion 54.

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 is
A front wall part 61 and a rear wall part 62 are provided in succession at the front and rear ends of a long main wall part 60 on which the claws 59 and 59 are arranged, and the sides of the claws 59 and 59 pass through these wall parts 61 and 62. Shafts 63 and 64 are formed on the axis, 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.
Position the claws 59, 59 in the holes 55, 55,
The shafts 63, 64 are inserted into grooves 68, 68 of support walls 67, 67 formed on the back surface of the tray 33, and are arranged so as to extend in the front-rear direction.
The shaft 64 is connected to a support column 6 formed on the back surface of the tray 33, as shown in FIGS. 11 and 13.
9 through a washer 70 and an annular plate 72 fixed by a screw 71. 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 claws 59 located in the holes 55 and 55,
The upper surface of the disc mount 59 can move up and down within the disk mounting section 46 by moving in and out of the bottom surface 46a of the disc mounting section 46. In this case, the claw 5 of the lifter 41
When the tray 9 is rotated in the upward direction, the pressed projection 66 enters into a hole 74 formed in the upper wall portion 73 of the tray 33, as shown in FIG. Note that the rotation range of the lifter 41 is such that the side end of the main wall portion 60 is the wall portion 7 formed on the tray 33.
The side end of the rear wall portion 62 is limited to a range from the position where it abuts on the upper wall portion 73 of the tray 33 . The lifter 41 is urged by a leaf spring 77 in the direction in which the claw 59 moves upward. That is, as shown in FIGS. 7 and 11, an intermediate portion of a leaf spring 77 is fixed to the back side of the tray 33 by a screw 78, and one end portion of this leaf spring 77 is formed on the tray 33. At the same time, the other end thereof is engaged with an engaging protrusion 65 of the lifter 41. 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). To explain the support structure of the tray 33, as shown in FIG. 1, FIG. 5, and FIG. Two holes 80 are formed in each case, and a roller support member 81 is provided by outsert molding in the portion where these holes 80 are formed. A roller 83 is rotatably supported by each roller support member 81 via a shaft 82, respectively. The tray 33 has its left and right side walls 48, 4.
The lower surface of the rail portion 49 at the bottom of 8 is the roller 83, 8
3... is placed on the same roller so as to come into contact with it. Further, on the left and right sides of the chassis 32, first
The holes 84 are shown in FIGS.
are formed, and guide columns 85 are formed by outsert molding in the areas where these holes 84 are formed.
is provided. Two guide columns 85, 85
are located outside the rail portions 49, 49 so as to restrict lateral movement of the tray 33. A washer 86 is attached to the upper end of each guide column 85 with a screw 87.
Fixed by The washer 86 has its peripheral edge located above the rail portion 49 in order to restrict upward movement of the tray 33. Based on this configuration, the tray 33 has rollers 83, 83...
It can move smoothly in the front and back direction while rolling in contact with the
(a position where the center of the disk placement part 46 coincides with the center of the turntable 39) and an open position (a position where the disk placement part 46 is pulled out forward and exposed to the outside of the device main body 31). It is now possible to move between. In this case, the turntable section 39 protrudes upward from the bottom wall section 52 of the tray 33 as shown in FIG.
3 so that 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 and 7. 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 chucking the disc 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 has an engaging portion 94 formed on its peripheral edge and an engaging portion 94 formed on the main body 90.
5 to prevent it from falling downward. 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,
Projecting wall portions 98 are formed at two locations on the left and right on the lower surface of the rear end of the main body 90, and the projecting wall portions 98
A shaft 99 is formed that projects laterally. 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 is rotatable in the directions of arrows C and D shown in FIGS. 2 and 3, and its tip is at the upper limit position shown by the two-dot chain line in FIG. 3 and the upper limit position shown by the solid line in the same figure. It is possible to move up and down between the lower limit position (the position where the disc is checked). In this case, clamper 3
4 is such that 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. Also, the main body 90
A cam follower 102 is formed on the right side of the distal end of the cam follower 102 and protrudes laterally, and a convex portion 103 that protrudes downward and extends in the left-right direction is formed at a predetermined distance forward position from the shaft 99. There is.
The tip of the cam follower 102 is connected to the tray 33.
It protrudes laterally from the outer surface of the side wall portion 48, and its vertical position is controlled by a cam body, which will be described later. When the tray 33 is placed in the closed position, the recess 103 engages with a recess 104 formed in the upper wall 73 of the tray 33 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 7. 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. 8 when the tray 33 is in the closed position. A clamper 34 like this
As shown in FIG. 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 14 to 17. 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. 15 and 16, 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. A portion 129 of this wall portion 123 where the gear 128 is not formed (hereinafter, this portion will be referred to as a cutout portion)
is the leading notch 1 located near the leading tooth of the gear 128
29a, and a rear notch 129b having a mostly arcuate shape behind it. The leading notch 129a is formed in a size that allows the protrusion 51 of the rack gear 50 to pass through as the cam body 115 rotates, but the rear notch 129b has a radial cutout amount that is equal to the protrusion amount of the protrusion 51. It is designed to be smaller. Further, the rear notch 129b is formed to have a rough surface so that the protrusion 51 of the tray 33 comes into contact with it with a constant frictional force, as described below. Here, the protrusion 51 of the tray 33, the rack gear 50 and the gear 128 of the cam body 115, the notch 1
To explain the positional relationship with 29, the 16th
As shown in FIG.
When the tray 33 is in the closed position as shown in the figure, the contact point _T between the imaginary moving straight line X of the rack gear 50 and the imaginary moving circle Y of the pinion gear 128. The protrusion 51 is located rearward from the position and abuts against the rear notch 129b with a constant frictional force. When the cam body 115 rotates in the direction of arrow E, when the leading notch 129a reaches the position of the protrusion 51, the protruding part 51 engages with the leading notch 129a and engages with the leading tooth 128a of the pinion gear 128. By being hooked from behind, both gears 1
28 and 50 are engaged with each other, 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 follower 102.
The height of the cam part 125 will be explained with reference to FIGS. 15 and 16. The area indicated by the reference numeral 131 is a flat part at the same height as the upper surface of the main wall part 120, and the area 132 adjacent to this is a flat part. 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. What is particularly taken into consideration at this time is that the notch 129 is at least the inclined part 13.
2 is formed so as to cover the area in which it is formed. This allows the protrusion 51 to come into contact with the notch 129 when the tip of the clamper 34 moves up and down.

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 neutral position, and then the rotation of the cam body 115 is stopped. This control circuit is
A control circuit for controlling the disk drive motor 37 is provided on a printed circuit board 141 disposed on the lower surface 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 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.

Figures 1 to 10, Figure 14, Figure 16,
The positions of each part indicated by solid lines in Fig. 17 are on tray 3.
3 is housed in the device main body 31, that is, the tray 33 is in the closed position.
When this tray 33 is in the rear closed position,
The protrusion 51 of the rack gear 50
Since the tray 33 is in contact with the rear notch 129b at a position rearward of the contact point T between the moving virtual straight line X and the moving virtual circle Y of the pinion gear 128, forward blind movement of the tray 33 can be reliably prevented. . Further, 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 chucks the disk 40 onto 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 18a
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 down onto the inclined part 132 as shown in FIG. 18b, and the inclined part 132 raises the cam follower 102. Note that at this time, the notch 129 comes into sliding contact with the protrusion 51 of the tray 33 with a constant frictional force. The cam portion 125 of the cam body 115 connects the cam follower 102 to the flat portion 13.
Let it reach 3. In this way, the cam follower 10
2 is raised, the clamper 34 rotates in the direction of arrow D and the disc 40 is moved by the chuck plate 92.
The chuck is released, the pressing piece 105 rises, and the engagement between the convex portion 103 and the concave portion 104 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.

When the gear 128 and the rack gear 50 engage with each other, first the leading notch 12 of the cam body 115 is
The protrusion 51 of the rack gear 50 engages with 9a,
Top tooth 12 located at the end of pinion gear 128
8a contacts and catches the protrusion 51 from behind in an arc shape, and the protrusion 51 is pushed forward. Next, each tooth of the gear 128 meshes with the rack gear 50, and the rack gear 50 is pushed forward by the gear 128. Here, when the gear 128 is caught on the protrusion 51 and pushed forward, the gear 1
28 and each tooth of the rack gear 50 are placed in a predetermined positional relationship, that is, in a positional relationship that allows these gears 128 and 51 to mesh smoothly. In this case, due to the blind motion prevention effect described above, when the tray 33 is in the rear closed position, the protrusion 51 is always stopped at the desired position, and the protrusion 51
Since the pinion gear 128 comes into contact with the rear end in an arc shape, the pinion gear 128
The leading tooth 128a can catch the protrusion 51 and mesh with the leading tooth groove of the rack gear 50 reliably. Therefore, when the gears 128, 51 engage, there is no possibility that a misalignment will occur between the gears 128, 51 due to a timing shift or the like, and the gears 128, 51 will mesh extremely smoothly.

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. 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 cam body 115 comes into contact with the actuator 138 of the limit switch 137, and this pin 135 brings the actuator 138 into contact with the contact 139 as shown by the two-dot chain line in FIG. let When the actuator 138 comes into contact with the contact 139, the actuator 138 and the contact 139
The control circuit that includes the motor 111 as a part of its circuit
, rotate the cam body 115 slightly in the direction of arrow F to return the actuator 138 to the neutral position, then stop the motor 111 and rotate the cam body 115 slightly.
stop the movement of In this case, tray 33
When the cam body 11 is pulled out most forward, the cam body 11
The stopper 124 of No. 5 comes into contact with the stop pin 142, and 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 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 placement portion 40 coincides with the center of the turntable 39, and the tray placement portion 4
The center of the disk 40 that is being raised by the lifter 41 in the 0 is also coincident with the center of the turntable 39. From this point on, the cam follower 102 of the clamper 34 moves to the inclined portion 132 of the cam portion 125 and begins to descend. At this time, the protrusion 51 formed on the tray 33 contacts the notch 129 of the cam body 115 with a constant frictional force, and prevents the cam body 115 from being rotated at high speed by the cam follower 102, thereby causing impact noise. This prevents damage to the disk 40 and clamper 34 from occurring.

Thus, the cam follower 102 descends smoothly, and the chuck plate 92 slowly descends to chuck the disk 40 onto 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 checked by the check board 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 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. 18a. 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.

"Effect of the invention" According to this invention, in the rear closed position of the tray, the protruding part abuts the rear notch of the pinion gear at a position rearward of the contact point between the imaginary straight line of movement of the rack gear and the imaginary circle of movement of the pinion gear. Blind forward movement of the tray can be reliably prevented, and the protrusion can always be placed at the desired position.
By hooking the pinion gear onto the protrusion when the pinion gear and the rack gear engage, it is possible to define the positional relationship between the pinion gear and the rack gear, thereby preventing mis-meshing between the pinion gear and the rack gear. This allows these gears to mesh smoothly and reliably. Therefore, effects such as opening and closing of the tray are ensured, there is no waste in feeding, and overloading of the drive source of the pinion gear can be avoided.

[Brief explanation of the drawing]

Figure 1 is a plan view of the main parts of a disc playback device to which this invention is applied, Figure 2 is a perspective view of Figure 1;
Figure 3 is a sectional view taken from Figure 1, and Figure 4 is a cross-sectional view of Figure 3.
Figure 5 is an enlarged view of the main parts of the figure, Figure 5 is a line sectional view of Figure 1, and Figure 6 is a partially cutaway tray section.
Figure - Linear view, Figure 7 is a partially cutaway Figure 1 - Linear view, Figure 8 is Figure 1 - Linear enlarged sectional view, Figure 9 is Figure 1 - Linear enlarged sectional view. , FIG. 10 is an enlarged sectional view taken from FIG. 1, FIG. 11 is a bottom view of the tray portion, FIG. 12 is a sectional view taken from FIG. , FIG. 14 is a cross-sectional view taken from FIG. 1, FIG. 15 is an enlarged view of the main parts of FIG.
6 is an enlarged view of the cam body portion of FIG. 1, FIG. 17 is an explanatory diagram showing the positional relationship between the cam body, the rack gear, and the protrusion, and FIG. 18 is an explanatory diagram of the operation of the disc playback device. 33...tray, 39...turntable, 4
0...Disk, 46...Disk placement part, 50
...Rack gear, 51...Protrusion, 128...Pinion gear.

Claims (1)

[Claims for Utility Model Registration] A front open position and a front open position where a disk can be taken in and out of the disk placement section, which has a disk placement section and a linear rack gear to which driving force is transmitted. a tray supported so as to be movable between a rear closed position and a rear closed position in which a disk placed on the rack can be rotationally driven by a turntable; In a disk playback device equipped with circular pinion gears that move forward and backward, respectively, at the front leading tooth position of the rack gear of the tray,
A protrusion is formed that protrudes beyond the tip of the tooth of the rear rack gear that follows this, and when the tray is in the closed position, the protrusion is located behind the point of contact between the imaginary straight line of movement of the rack gear and the imaginary circle of movement of the pinion gear. The positional relationship between the tray and the pinion gear is set such that the protrusion is located, and the pinion gear is configured to be able to further rotate the tray by a predetermined amount in the opposite direction after bringing the tray to the closed position. The part of the arc that faces the virtual straight line of movement of the rack gear during over-rotation is a notch in which the pinion gear is cut out, and this notch includes a leading notch that allows the protrusion of the rack gear to pass through, and a leading notch that allows the protrusion of the rack gear to pass through. It consists of a rear notch and a
The radial notch amount of this rear notch is set smaller than the protrusion amount of the protrusion of the rack gear, so that after the tray reaches the closed position from the open position, the protrusion of the rack gear is By contacting the rear notch, blind movement of the tray in the opening direction is prevented, and when the pinion gear is rotated in the forward direction to move the tray from the closed position to the open position, the protrusion of the rack gear A disk automatic device for a disk regenerating device, characterized in that the two gears are brought into mesh according to predetermined conditions by hooking the leading tooth of the pinion gear.