JPS6331246Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a clamper blind movement prevention device for preventing blind movement of a clamper that chucks a disk to a turntable in a disc playback device.

Automating the loading of discs in a disc playback device not only improves the operability of the device, but also ensures that the discs are always loaded in a prescribed procedure, which protects the disks and equipment and also helps to prevent discs from being placed in a specified manner. It has the advantage that it can always be attached accurately to the desired 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, the following configuration is common for this type of disc playback device. First, a tray having a disk mounting section is disposed within the main body of the device. This tray can be moved between an open position where the disk rest is located outside the device body and a closed position where the disk rest is located inside the device where the turntable is installed. It's summery. A drive source for driving the tray, such as a motor, for moving the tray between the two positions described above is provided within the main body of the device. Further, a clamper is provided within the main body of the device to chuck a disk placed on the disk placement portion of the tray onto the turntable when the tray is in the closed position. This clamper is driven by a drive source for driving the clamper, such as an electromagnetic solenoid.

To operate the above device, first press the operation button for opening the tray to start the drive source for driving the tray, pull out the tray from the main body of the device, bring it to the open position, and place the tray on the disk. expose the part to the outside. In this state, the disk is placed on the disk placement section. Next, press the tray closing operation button to bring the tray to the closing position. When the tray is moved to the closed position, the drive source for driving the clamper is started in conjunction with the movement of the tray, and the clamper, which was in the standby position, moves to chuck the disk to the turntable. By pressing the play button, the disc is rotated by the turntable and playback is performed.

By the way, in the above-mentioned disc playback device, the drive system for driving the tray and the clamper is constructed separately, so the structure of the drive system becomes complicated, and the control system for timing the operation of the tray and clamper becomes complicated. It had the disadvantage of becoming.

Therefore, the inventor of this application proposed a disk reproducing device that eliminates the above-mentioned drawbacks, in which both the tray and the clamper are driven by a cam body linked to one drive source. In other words, the device forms a rack gear on the tray to receive driving force, meshes a pinion gear formed on the cam body with this rack gear, and moves the tray by rotating the cam body with a single drive source. . Then, the clamper is biased by a biasing member against a cam portion formed on the cam body, and the clamper is moved by following the rotating cam portion, thereby performing chuck operation and chuck release operation of the disk. . According to this device, the tray and clamper are driven by a single drive source, which simplifies the structure of the drive system, and the timing of the operation of the tray and clamper can be set by the shape of the cam body. The configuration of the control system can be simplified.

However, in the above device, when operating the clamper to chuck or release the disc chuck, the engagement between the pinion gear of the cam body and the rack gear of the tray is released (when the clamper operates, the tray is closed). Since the pinion gear and rack gear must be stopped at that position, it is necessary to disengage the pinion gear and rack gear).
In particular, when the disk chucks, the load acting on the cam body is reduced to only the drive system that drives the cam body, which reduces the load on the cam body, and at the same time, the clamper acts on the cam body in the opposite direction, causing the cam body to rotate. Since the direction of the force to be applied and the direction in which the cam body is driven by the drive source match, the clamper, which should follow the movement of the cam part of the cam body, is forced by the force of the biasing member. Then, the cam body rotates in the opposite direction to perform a sudden chuck operation, causing the clamper to collide with the disk, causing damage to the clamper and the disk.

This invention was made in view of the above circumstances, and is a clamper blind movement prevention device that prevents blind movement of the clamper in a disc playback device as described above in which both the tray and the clamper are driven by a cam body. When the clamper is operated by the cam body, a protrusion that protrudes beyond the tooth tip of the rack gear formed on the tray and a notch of the pinion gear formed on the cam body have a moderate frictional force. The cam body is slidably brought into contact with the cam body, thereby applying a constant load to the cam body and preventing blind movement of the clamper.

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 walls 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 protruding portion 51 that protrudes laterally from the tip of the tooth of the rack gear 50 adjacent to the front of the tip tooth of the rack gear 50;
is formed. Note that this protrusion 51 will be explained in detail later. Furthermore, 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 penetrates the peripheral wall 54 of the disk mounting portion 46 and opens into the notch 45 . Furthermore, holes 55, 55, . . . for arranging the claws of the lifters 41, 41 are formed in the bottom wall portion 52 and 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 is locked to the engagement 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 outsert-molded twisted guide posts 85 are formed 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 can smoothly move back and forth while rolling in contact with the rollers 83, 83, . The disk mounting section 46 can be moved between the position where the center of the disk mounting section 46 coincides with the center of the turntable 39) and the open position (position where the disk mounting section 46 is exposed to the outside of the device main body 31 when it is pulled out forward). There is. In this case, the turntable section 39 protrudes upward from the bottom wall section 52 of the tray 33 as shown in FIG.
The tray 3 that moves due to the formation of
There is no contact with 3. 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 4 discs are 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 protrudes downward by a predetermined distance forward from the shaft 99.
A convex portion 103 extending in the left-right direction is formed. The cam follower 102 has a distal end protruding laterally from the outer surface of the side wall 48 of the tray 33.
Its vertical position is controlled by a cam body which will be described later. The convex portion 103 is the tray 33
When the tray 33 is placed in the closed position, it 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 formed to have a rough surface so that the protrusion 51 of the tray 33 abuts with a constant frictional force as described below. Here, the protrusion 51 of the tray 33,
To explain the positional relationship between the rack gear 50, the gear 128 of the cam body 115, and the notch 129, as shown in FIGS. 16 and 17, the protrusion 51 protrudes laterally from the tooth tip of the rack gear 50 by a dimension _l1 When the tray 33 is in the closed position shown in the figure, the protrusion 51 is slidably abutted against the notch 129 with an appropriate frictional force. When the cam body 115 rotates in the direction of arrow E, the gear 128 engages with the rack gear 50, 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 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.
In this state, the disk mounting portion 46 of the tray 33
is positioned so that its center coincides with the center of the turntable 39. In the clamper 34, the cam follower 102 is connected to the flat portion 131 of the cam portion 125.
The tip of the chuck plate 92 is in a lowered state by contacting the turntable 3.
9 , the pressing piece 105 presses down the pressed protrusion 66 of the lifter 41 , and the convex portion 103 is 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 pressed projection 6
6 is pushed down, the claw 59 is placed at the lower limit position below the disk 40.
Further, the tray 33 is locked in that position by the projection 103 engaging with the recess 104.
Further, the actuator 138 of the limit switch 137 has a contact point 1 as shown by a solid line in FIG. 18a.
It is placed in a neutral position between 39 and 140.

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. 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. 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 moves to a position where the disk mounting portion 46 is exposed to the outside of the device body 31. When the tray 33 is moved, the disk 40 is supported at the upper limit position by the claws 59 of the lifter 41, so that the disk 40 can be moved without touching the turntable 39. When the tray 33 moves to the above position, the pin 135 of the cam body 115 engages the actuator 138 of the limit switch 137.
This pin 135 connects the actuator 138 to the contact point 13 as shown by the three-dot chain line in FIG. 18c.
9. Actuator 138 is contact 1
39, these actuators 13
8. The control circuit that includes 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 operates the actuator 138.
is returned to the neutral position, and the motor 111 is stopped to stop the movement of the cam body 115. 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, and excessive rotation of the cam body 115 is mechanically prevented.

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 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 center of the turntable 39 also coincides 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.

That is, when the cam follower 102 descends, the cam body 115
The gear 128 is disengaged from the rack gear 50. On the other hand, the cam follower 102 of the clamper 34
is strongly abutted against the inclined portion 132 by being biased by the coil spring 108 . Here, the cam body 115 is in a state where the direction of rotation of the cam body 115 urged by the cam follower 102 and the direction of rotation of the cam body 115 by the motor 111 are in the same state, so the cam follower 102 is influenced by the force of the coil spring 108. Therefore, there is a concern that the inclined portion 132 must be lowered at high speed while the cam body 115 is forcibly rotated faster than the rotation by the motor 111. Here, the cam body 115 has a drive gear 1.
18, 119, pinion gear 117, motor 11
1 acts as a load, but since the reverse biasing force of the cam follower 102 and the rotating direction of the motor 111 match as described above, these loads alone cannot completely suppress the above phenomenon. When the cam follower 102 descends at high speed, the clamper 34
The chuck plate 92 collides with the disc 40 at high speed, shockingly chucks the disc against the turntable 39, and also causes the pressing piece 105 to collide with the disc 40.
collides with the pressed protrusion 66, and the convex part 103 collides with the concave part 1.
04. Therefore, when such a phenomenon occurs, impact noise is generated and the disk 40 and clamper 34 may be damaged. In this device, the above-mentioned inconvenience is prevented by bringing the protrusion 51 formed on the tray 33 into slidable contact with the notch 129 with an appropriate frictional force.

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.

As explained above, according to this invention, in a disc playback device in which a tray for transporting a disc and a clamper for chucking a disc placed on this tray to a turntable are driven by a cam body, Even if the load on the cam body decreases due to the disassociation between the tray and the cam body when the drive is stopped, when the clamper is operated by the cam body, the tooth tip of the rack gear formed on the tray The protrusion that protrudes from the cam body and the notch of the pinion gear formed in the cam body are slidably brought into contact with each other with an appropriate frictional force, and a constant load is applied to the cam body. This prevents the clamper in contact with the cam body from forcibly rotating the cam body, thereby preventing blind movement of the clamper and preventing damage to the clamper and disk during operation of the clamper. can.

[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 of FIG. 1, FIG. 11 is a bottom view of the tray portion, and FIG. 12 is a diagram of FIG.
13 is an explanatory diagram showing the installed state of the rib tab, FIG. 14 is a sectional view taken along the line XIV-XIV of FIG. 1, FIG. 15 is an enlarged view of the main part of FIG. 14, and 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. 31...Equipment body, 33...Tray, 34...
Clamper, 39...Turntable, 40...Disk, 46...Disk placement part, 50...Rack gear, 51...Protrusion part, 102...Cam follower, 108...Biasing member (coil spring),
111... Drive source (motor), 115... Cam body,
125...Cam section, 128...Pinion gear, 1
29... Notch.

Claims (1)

[Claims for Utility Model Registration] The disc has a disk mounting portion and a rack gear that receives driving force, and has an open position where the disk is placed in and out of the disk placement portion, and a rack gear that is placed in the disk placement portion. A tray is supported so as to be movable between a closed position and a closed position in which a disc is rotationally driven by a turntable, and a tray is supported so as to be movable up and down between an upper limit position and a lower limit position and is lowered by a biasing member. a clamper that is biased in the position direction and that, when the tray is in the closed position, is lowered by the biasing member and chucks the disk placed on the disk mounting portion onto the turntable; and a clamper that can freely mesh with the rack gear. The pinion gear and the clamper have a cam part that comes into contact with the biasing force of the biasing member, and a cam body that is driven by a drive source, and the tray and the clamper are connected to each other by the cam body. In the disk reproducing device configured to drive both the clamper and the clamper, the tray is formed with a protrusion that protrudes beyond the tips of the teeth of the rack gear, the pinion gear of the cam body is formed with a notch, and the clamper is operated during a rising operation period. A device for preventing blind movement of a clamper of a disc reproducing device, characterized in that the protruding portion and the notch portion are slidably brought into contact with each other with an appropriate frictional force during a period of downward movement.