JPH0132204Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to a loading device for a disc playback device used for playing back discs such as compact discs and optical video discs.

[Prior art]

2. Description of the Related Art Among conventionally provided disk playback devices, such as a floppy disk playback device, the disk is played by loading the disk into a main body of the device while the disk is housed in a case. In such a disc playback device, since the disc is always handled together with the case, it is possible to prevent inconveniences such as fingerprints from sticking to the disc, and to protect the disc.

Incidentally, conventionally, the loading device of this type of disc playback device, that is, the device for transporting a disc inserted into the main body of the device to a predetermined position where it can be played, is all provided on the main body side of the device. However, when the loading device is provided only on the device main body side in this way, there is a drawback that the structure of the device main body becomes extremely complicated.

Therefore, the applicant constructed a case so that a disk could be stored therein, formed a rack gear for loading on the case, provided a pinion gear on the device main body side that meshed with the rack gear, and transferred the case by rotating this pinion gear. A loading device thus constructed was provided in Japanese Patent Application No. 70478/1983.

[Problem that the invention attempts to solve]

In the above-mentioned loading device, when the case is inserted into the main body of the device and the rack gear is engaged with the pinion gear, the following problems occur because the above-mentioned gears are always engaged during loading.

That is, when the disc playback device is used as a vehicle, for example, when the vehicle vibrates, this vibration is transmitted to the case. Furthermore, some operators of the case may continue to hold the case in their hands even after loading has started, resulting in a delay in releasing the case. in this way,
If any external force is applied to the case during loading, since the rack gear and pinion gear are engaged, excessive force may be applied to the drive system of the pinion gear that moves the case, or the loading transfer amount may be limited to a finite amount. When the case is set to a fixed position, the transfer operation may end before the case reaches the predetermined position, and the loading operation may not be carried out reliably.

In this invention, the problem is how to solve the above-mentioned problems such as when a disturbance is applied to the case during loading.

[Means for solving problems]

In this invention, the drive system of the loading pinion gear that meshes with the rack gear of the case is provided with a carrier having a carrier rack gear that is moved by a drive source, and a carrier pinion gear that meshes with the carrier rack gear. It is connected to a carrier pinion gear via a clutch mechanism.

〔Example〕

1 to 21 are diagrams showing an embodiment of this invention, and are diagrams showing an embodiment in which this invention is applied to a compact disc player.

The disc playback device (compact disc player) described here consists of a disc magazine case A that stores discs (compact discs) and a device body B. Discs are exchangeably stored in the disc magazine case A, and the discs are exchangeably stored in the disc magazine case A. Place the disk magazine case A into the device body B together with the case.
The disc is loaded into the disc magazine case, and the disc stored in the disc magazine case is played back in the stored state.

1 and 6 show the structure of the main parts of the device body B as well as the structure of the disk magazine case A. As shown in these figures, the disk magazine case A has a rectangular shape in plan view and is a plate-like body having a constant thickness. This case A can rotatably house the disc 1 in a played state inside, and has a clamper insertion hole 2 formed on its upper surface, and a turntable insertion hole 3 and a laser beam introduction hole on its lower surface. 4 is formed, and a rack gear 5 is formed on one side.

The main structure of the device body B is shown in FIGS. 1 to 6. As shown in these figures, a chassis 7 is disposed within the exterior case (not shown) of the device body B, and carriers 8, 8 are attached to this chassis 7, and furthermore, a clamper 9 and a holder 1 are attached to the chassis 7.
0 is supported. The chassis 7 has side plate portions 11, 11 bent downward on the left and right sides thereof.
is formed, and a long hole 12 extending in the front-rear direction is formed in the side plate portion 11. carrier 8
The one disposed on the left side of the chassis 7 and the one disposed on the right side have substantially symmetrical shapes.
7 to 14 show details of the carrier 8 arranged on the right side. As shown in these figures, the carrier 8 has a plate-shaped main wall 13.
Guide pins 14 and 15 are formed on one side, and a cam protrusion 16 and a carrier latch gear 17 are formed on the other side.
A synchronized lock gear 18 is further formed on the lower surface of the front half of the main wall portion 13. The upper surface of the main wall portion 13 includes a flat portion 19a and an inclined portion 1 that slopes downward from the front end of the flat portion 19a.
9b, and a flat portion 19c extending slightly forward from the lower end of the inclined portion 19b. The guide pin 15 includes a guide portion 20 that projects laterally from the main wall portion 13, and an engaging portion 21 that projects further laterally from the guide portion 20. The cam protrusion 16 includes a flat part 16a along the upper edge of the main wall part 13, an inclined part 16b inclined diagonally downward from the front end of this flat part, and a flat part 16c extending forward from the lower end of this inclined part 16b. It is made up of The carrier 8 disposed on the left side has substantially the same configuration as above, but differs from the above configuration in that the carrier lug gear 17 is not formed. The carriers 8, 8 thus formed are attached to the chassis 7 so as to be movable in the front and rear directions by loosely fitting the guide pins 14, 15 into the elongated holes 12, respectively. In this case, the guide pin 15 is
The guide portion 20 is located within the elongated hole 12, and the engaging portion 21 is located so as to protrude inward of the chassis 7. At the lower end of the side plate parts 11, 11 of the chassis 7,
As shown in FIG. 4, these side plate parts 11, 11
A shaft body 23 is rotatably attached through holes 22, 22 formed in the shaft body 23, and synchro pinion gears 24, 24 are fixed to the ends of the shaft body 23 that protrude outward from the side plate portions 11, 11. There is.
These synchro pinion gears 24, 24 are the first
Carriers 8 and 8 as shown in Figures 3 and 4.
The synchronized lock gears 18, 18 are meshed with each other. Based on this configuration, the carriers 8, 8 are
When one moves in the longitudinal direction, the other moves in exactly the same way, that is, synchronously, in the longitudinal direction via the synchro pinion gears 24, 24 and the shaft body 23.

The clamper 9 includes a disk-shaped clamper body 26 that holds the disk 1 attached to the middle of the lower surface of a support plate 25. The support plate 25 has front and rear side plate parts 27, 27, 28 on both sides thereof, respectively.
28 is formed, and the side plate parts 27, 27, 2
Long holes 29, 29, 30, and 30 are formed in the holes 8 and 28, respectively. Pin 3 is attached to the side plate parts 28, 28.
One end of each clamper arm 32, 32 is rotatably attached via a pin 34, 31, and the other end of each clamper arm 32, 32 is attached to a protrusion 33, 33 formed on the chassis 7 with a pin 34, 34. It is rotatably attached via the Follower pins 35, 35 are fixed to the lower end of the side plate portion 27 so as to protrude inward of the support plate 25, and the follower pins 35, 35 are connected to the cam surfaces 19, 1 of the carriers 8, 8.
9 is engaged.

The holder 10 is a member that stores and holds the disk magazine case A therein, and has a window frame shape in plan view. This holder 10 has an opening 37 formed at its front end into which the disk magazine case A is inserted.
Openings 38, 38 are formed on both sides thereof, and a support protrusion 39 is formed above one (right side) opening 38. Holder arms 41 and 4 are connected to both sides of the front end of this holder 10 via pins 40 and 40.
1 is rotatably attached to the holder arm 4.
The other end of 1, 41 is a long hole 42, 4 formed therein.
The two portions are fitted onto pins 43, 43 fixed to the side plate portion 11 of the chassis 7. Furthermore, holder 1
There are pins 44, 44, 45 on both sides of 0, respectively.
45 is fixed, and these pins 44, 4
4, 45, 45 are the elongated holes 2 of the clampers 9, 9, respectively.
9, 29, 30, and 30.

Based on the above configuration, the holder 10 has a long hole 4
The pins 43, 43 can be moved vertically within the relative movable range within the pins 2, 42. Further, the clamper 9 can be rotated vertically in a substantially horizontal state by rotating the clamper arms 32, 32. In this case, the vertical movement of the clamper 9 with respect to the holder 10 is caused by the pins 44, 44,
45, 45 are limited within the range in which they can move relative to each other within the elongated holes 29, 29, 30, 30. here,
The clamper 9 connects the lower surface of the clamper 9 with the holder 1.
A hold spring 46 interposed between the upper surface of the
46, it is constantly urged upward against the holder 10.

A limit switch 48 is attached to one opening 38 of the holder 10 described above. This limit switch 48 is for detecting whether or not the disk magazine case A is inserted into a certain position within the holder 10, and its actuator 49 projects inward of the holder 10 as shown in FIG.

A shaft body 23 to which synchro pinion gears 24, 24 are fixed is disposed at the lower ends of the side plate portions 11, 11 of the chassis 7, and both ends of the shaft body 23 protrude outward from the synchro pinion gears 24, 24. Clamping arms 55, 55 are provided in the parts, respectively.
One end is rotatably attached. Pins 56, 5 are provided at the other ends of the clamping arms 55, 55.
6 are fixed, and clamp springs 58, 5 are provided between the outwardly projecting ends of these pins 56, 56 and protrusions 57, 57 formed on the clamper 9.
8 is installed. Here, pins 56, 56
protrudes outward from the clamping arms 55, 55, and also protrudes inward (in the direction of the carrier 8), and the inwardly protruding portions correspond to the cam protrusions 16, 16 of the carriers 8, 8. is engaged with the bottom surface of the Based on this configuration, the clamper 9 is always urged downward by the clamp springs 58, 58. In this case, the operating lengths of the clamp springs 58, 58 are in the states shown in FIGS. 20a to 20c (FIG. 20a is before loading, FIG. 20b is during loading, and FIG.
indicates the playback status. Note that the operations in these figures will be described later) are set so that L ₃ ≧L ₂ ≧L ₁ , and a sufficient clamping force can be obtained with a small spring constant.

A support protrusion 60 is formed at the lower end of one side plate part 11 of the chassis 7 at a position facing the support protrusion 39 of the holder 10, and a recess formed on the upper surface of the support protrusion 60. A spline joint 63 having a carrier pinion gear 62 formed on its outer peripheral surface is rotatably supported within the spline joint 61 . Details of the spline joint 63 and carrier pinion gear 62 are shown in FIGS. 15 to 17. As shown in these figures, the spline joint 63 is a cylindrical member,
Engagement grooves 64 are formed on the inner surface of the hole 63a in the axial direction of the hole 63a. The carrier pinion gear 62 is the spline joint 6 mentioned above.
3 is integrally formed on the outer peripheral surface of the upper end. This carrier pinion gear 62 is meshed with the carrier lug gear 17 of the carrier 8 with the spline joint 63 supported as described above. On the other hand, the support protrusion 3 of the holder 10
9, attach the lower end to the spline joint 6 above.
A spline shaft 65 is inserted into the shaft 3 and supported rotatably. spline shaft 65
has the shape shown in FIG. 18, and has engagement grooves 64 for spline joints 63 on the outer peripheral surface of its lower end.
It has an engaging portion 66 that engages with. This spline shaft 65 can move up and down with respect to the spline joint 63 with its lower end inserted into the hole 63a of the spline joint 63, and when the spline joint 63 rotates, it is engaged. Since the fitting portions 66 are engaged with the engagement grooves 64, they rotate together with the spline joint 63. Also, this spline shaft 65
The outer diameter of the lower end of the shaft is smaller than the inner diameter of the hole 63a of the spline joint 63 by a certain size, and the engaging portion 66 is semicircular when viewed from the side. It can be tilted slightly with respect to the spline joint 63 around the portion where the engaging portions 66 are formed.

A disk-shaped friction plate 67 is fixed to the upper end of the spline shaft 65, and this friction plate 6
A loading pinion gear 68 is rotatably mounted on the upper surface of the clutch 7, and a clutch spring 69 interposed between the support projection 39 and the loading pinion gear 68 is wound around the clutch spring 69. Here, a part of the outer circumference of the loading pinion gear 68 is located inside the holder 10 through the opening 38 of the holder 10, and when the disk magazine case A is inserted into the holder 10, the loading pinion gear 68 is inserted into the holder 10. It is designed to mesh with rack gear 5. This loading pinion gear 68 is formed to have a larger diameter than the carrier pinion gear 62, and has a gear ratio greater than 1 with respect to the carrier pinion gear 62. As a result, when the loading pinion gear 68 is rotated to transfer the disk magazine case A as described later, a slight movement of the carrier 8 causes the disk magazine case A to move significantly. This loading pinion gear 68 is constantly pressed against the friction plate 67 by a clutch spring 69, and can rotate by slipping against the friction plate 67 when rotated with a force exceeding a certain value. When the friction plate 67 rotates together with the friction plate 65, it rotates together with the friction plate 67, and when an overload is applied during rotation, it slips against the friction plate 67, allowing only the friction plate 67 to rotate. Thus, the friction plate 67 and the loading pinion gear 68 constitute a friction clutch mechanism 70.

A disk drive motor 75 is fixed to the lower surface of the center of the chassis 7, and this motor 75
A turntable 76 is fixed to a rotating shaft that projects upward from the chassis 7. Here, the turntable 76 is located opposite the clamper main body 26 of the clamper 9.

As shown in FIGS. 5 and 6, two guide shafts 80, 80 are disposed below the rear end of the chassis 7 and extend in the front-rear direction. These guide shafts 80, 80 have a head base 8 to which a pick up head 81 is attached.
2 is attached so as to be movable in the front and rear directions. Support wall portions 84, 84, 84, 84 each having a hole 83 are formed in the head base 82, and guide shafts 80, 80 are inserted into each hole 83 of these support wall portions 84, 84, 84, 84. The configuration is as follows. A feed loading motor 85 is disposed on the side of one guide shaft 80, and the rotational force of this motor 85 is transmitted through a belt 86, a pulley 87, and a small diameter gear coaxially fixed to this pulley 87. The signal is transmitted through a gear 88 to a large-diameter gear 89 disposed near one side of the head base 82 . A feed loading pinion gear 90 is fixed coaxially above the gear 89, and this feed loading pinion gear 90 is meshed with a feed loading rack gear 91 configured on one side of the head base 82. . Based on this configuration, the feed
When the loading motor 85 is rotated,
The rotational force reduced by the pulley 87, gears 88, 89, etc. is transmitted to the pinion gear 90, which moves the rack gear 91 so that the head base 82 moves forward (direction of arrow _P2 ) or backward (direction of arrow _P1 ). ). Here, the signal reading section 81a of the pick-up head 81 detects that when the disk magazine case A is placed in a fixed position where the disk 1 can be played back,
moving in the front-back direction directly below the laser beam introduction hole 4,
The signals recorded on disk 1 can be read. Here, the head base 82 is connected to the signal reading section 8 of the pick-up head 81 as described above.
1a can read the signal of disk 1, that is, the signal reading section 81a can read the signal of disk 1.
from the lead-in position (starting position of the track where the signal of disk 1 is recorded, usually the innermost track position) to the lead-out position of disk 1 (the last position of the above track, usually the outermost track position) In addition, the signal reading section 81a can be moved from the lead-out position to the outside of the disk 1 in the radial direction so that a mode switching mechanism 112 (described later) can switch between loading, play, and eject modes. a predetermined position on the side, that is, a push switch 94 to be described later.
The push rod 93 can be moved until it comes into contact with the stopper 110. However,
The mechanism for moving the pickup head 81 mentioned above constitutes a feed mechanism 92 together with a tracking servo control device so that the optical focus of the pickup head 81 always matches the signal track recorded on the disk 1.

The other end of the head base 82 has an engaging stepped portion 8.
2a is formed, and this engagement step portion 82a is
When the head base 82 moves in the direction of arrow _P1 (rearward), it engages with the engaging portion 21 of the carrier 8 and moves the carrier 8 in the direction of arrow _P1 . Further, on the upper surface of the other end of the head base 82, a push rod 93 is protruded rearward and a push switch 94 is mounted.
is installed. In addition, the head base 82
Guides 95, 95 are formed on the upper surface of the other side, and a slide hook 96 is mounted within these guides 95, 95 so as to cross the push rod 93 and move in the left and right direction. A pin 97 is fixed to the upper surface of one end of the slide hook 96, and one end of a return spring 98 is hooked to the pin 97. Pins 99 and 100 are fixed to the upper surface of the slide base 82, and the middle part of the return spring 98 is wound around the pin 99, and the other end is hooked to the pin 100. Based on this configuration, the slide hook 96 is always urged in the direction of arrow _P3 (to the left) by the return spring 98.

The push switch 94 is configured to provide a trigger for a control circuit that controls turning on and off of the feed/loading motor 85, and also operates to switch between loading mode, eject mode, and playback mode, as will be described later. It was configured as a push switch. The details of the structure of this switch 94 are shown in FIG. That is, this switch 94 is
Initially, when the push rod 93 is moved in the direction of arrow _P2 and locked inside the switch body 102 (in the position shown by the solid line in the figure), the circuit inside the switch body 102 is set to the on state. ing. In this state, push 9 more
3 is pushed slightly in the direction of arrow _P2 , the above lock is released, the push rod 93 is urged by a spring (not shown) and moves in the direction of arrow _P1 ,
It moves to the protruding position shown by the two-dot chain line in the figure. At this time, the electric circuit within the switch body 102 is turned off. And again pushyrod 93 is the arrow
When pushed in the _P2 direction, this rod 93 is locked in the original solid line position and the circuit within the switch body 102 is turned on.

This push switch 94's push switch 9
Reference numeral 4 has an operating rod portion 104 formed at the tip of the main rod portion 103, and an operating protrusion 105 that projects rearward is formed at the rear end of the operating rod portion 104.

As shown in FIG. 19, the slide hook 96 has an engaging wall portion 107 on one end (right end) side of the main wall portion 106.
A cam surface 108 is formed on the inner end (left end) side of the engagement wall portion 107. This slide hook 96 has a main wall 107 positioned between the operating protrusion 105 and the main rod 104, and a cam surface 108 that abuts the operating protrusion 105 so as to intersect with the push rod 94 in a cross shape. It is located.

Based on the above configuration, when the push rod 93 of the push switch 94 is moved in the direction of arrow _P2 and locked at the solid line position, the cam surface 108 of the slide hook 96 is moved toward the operating protrusion 10.
5, this slide hook 9
6 is moved in the direction of arrow _P4 and located at the protruding position (solid line position). From this state, when the push rod 93 is pushed a little in the direction of arrow _P2 , the lock is released and the push rod 93 moves in the direction of arrow _P1 and protrudes to the position shown by the two-dot chain line, the operating protrusion 105 By moving in the direction of arrow _P1 , the cam surface 108 of the slide hook 96 becomes movable in the direction of arrow _P3 , and the slide hook 96 is moved in the direction of arrow _P3 by the biasing force of the return spring 98. Retreat to the position indicated by the two-dot chain line.

The slide hook 96 that operates as described above is
In the state shown in FIG. 6, it is located protruding in the direction of arrow _P4 . When the head base 82 moves in the direction of arrow _P2 in this state, the slide hook 96 engages with the engaging portion 21 of the carrier 8, so that the head base 82 can move the carrier 8 forward. Further, when the slide hook 96 moves backward in the direction of arrow _P3 , the slide hook 96 does not engage with the engaging portion 21.

A stopper 110 is provided at the rear of the movement path of the head base 82, with which the push rod 93 of the push switch 94 comes into contact when the head base 82 moves a predetermined distance in the direction of arrow _P1 . Based on this configuration, the push switch 94 is configured such that the head base 82 is
P ₂ , P ₁ direction) and the push rod 93 comes into contact with the stopper 110 .

In the above configuration, the mechanism that moves the head base 82 in the front and back direction and the mechanism that rotates the loading pinion gear 68 in conjunction with the movement of the head base 82 as described later are the loading mechanism 1.
11 (loading device).

In the above configuration, loading switch 4
8. The push switch 94 constitutes a part of the control circuit, and the feed loading motor 85
control on and off. Further, the control circuit receives various operation commands by operating a play button, a stop button, a loading button, an eject button, etc. (not shown) provided on the main body B of the device.

Next, the operation of the disc reproducing apparatus constructed as described above during disc reproducing will be described with reference to FIGS. 1 to 6, FIG. 20, and FIG. 21.

First, the device main body B is in a standby state before inserting the disk magazine case A, as shown in FIG. 20a.
As shown in , the clamper 9 and holder 10 are in an elevated state. Also, at this time, the push switch 9
The push rod 93 of No. 4 has been moved in the direction of arrow _P2 and is in a locked state, as shown in FIG. 21a.

Here, to play disk 1, move the disk magazine case A containing disk 1 to the second
Insert it into the holder 10 as shown in Figure 0a. Specifically, the disk magazine case A is manually inserted until its tip abuts the actuator 49 of the loading switch 48 and the tip of the rack gear 5 meshes with the loading pinion gear 68. Then, the loading switch 48 is turned on, thereby turning on the feed loading motor 85. When the feed loading motor 85 rotates, this rotational force is transmitted to the feed loading pinion gear 90, which moves the head base 82 in the direction of arrow _P1 . When the head base 82 moves in the direction of arrow _P1 , the engagement step 82a of the head base 82 engages with the engagement part 21 of the carrier 8, as shown in FIG. 21b. 8 moves in the direction of arrow _P1 . When the carrier 8 moves in the same direction, the carrier pinion gear 62 meshing with the carrier lug gear 17 of the carrier 8 rotates as shown in FIG. The shaft 65 and the friction plate 67 rotate. When the friction plate 67 rotates, the loading pinion gear 68 that is in pressure contact with the friction plate 67 rotates, whereby the rack gear 5 meshes with the loading pinion gear 68.
The disk magazine case A is moved in the direction of arrow _P1 , that is, inward of the holder 10. Here, a pin 56 fixed to the clamping arm 55
Initially, the inner end of the carrier 8 is in contact with the flat part 16a of the cam protrusion 16 as shown in FIG. 20a, but as the carrier 8 moves in the direction of arrow _P1 , the inner end of
As shown in FIG. 2 , it begins to move along the inclined portion 16b. As a result, the clamping arm 55 rotates in the direction of arrow _P5 while gradually tensioning the clamp spring 58. On the other hand, the follower pin 35 fixed to the clamper 9 is initially in contact with the flat part 19a of the cam surface 19 of the carrier 8 as shown in FIG. 20a, but as the carrier 8 moves in the direction of arrow _P1 , As shown in FIG. 20b, the inclined part 19
It begins to move downward along b. As a result, the clamper 9 lowers itself while lowering the holder 10 via the hold spring 49. Here, the members attached to the spline shaft 65 such as the loading pinion gear 68 are connected to the spline shaft 65 and the spline joint 6.
Since holder 1 and 3 are spline connected, holder 1
It descends with 0. In this manner, the disk magazine case A moving in the direction of arrow _P1 descends together with the holder 10, with the center of its turntable insertion hole 3 being located approximately above the center of the turntable 76, as shown in FIG. 21c. Here, the follower pin 35 contacts the flat portion 19c of the cam surface 19, as shown in FIG. 20c, and positions the clamper 9 and holder 10 at the lower limit position. Further, the pin 56 comes into contact with the flat portion 16c of the cam protrusion 16, and further rotates the clamping arm 55 in the direction of arrow _P5 , thereby strongly pulling the clamp spring 58. In addition, the clamper 9 is
As described above, when the clamp spring 58 is strongly pulled, the hold spring 46 is deformed and approaches the holder 10 relatively, and the clamper body 26 enters the case A through the clamper insertion hole 2 of the disk magazine case A. , a clamper 120 built into the upper side of disk 1 of disk magazine case A.
comes into contact with. On the other hand, at this time the turntable 76
As the disk magazine case A supported by the holder 10 descends, it relatively enters the turntable insertion hole 3 of the disk magazine case A and comes into contact with the lower surface of the disk 1. Thus, the disk 1 in the disk magazine case A is clamped between the clamper body 26 and the turntable 76 via the clamper 120 of the case A.

In this operation, disk magazine case A
When the turntable insertion hole 3 approaches the upper part of the turntable 76, its tip comes into contact with a stopper (not shown) provided in the holder 10 and stops its movement. Here, the moving length of the carrier 8 up to this point is shorter than the moving length of the disk magazine case A, but since the gear ratio of the loading pinion gear 68 to the carrier pinion gear 62 is greater than 1, the disk magazine case A is It moves a much longer distance than the moving length of the carrier 8 and comes into contact with the stopper as described above. At this time, since the loading pinion gear 68 constitutes the clutch mechanism 70 together with the friction plate 67, the loading pinion gear 68 is rotated even though the friction plate 67 is rotating.
7 and stops its rotation. Thereafter, the disk magazine case A descends while being engaged with the loading pinion gear 68 that slips against the friction plate 67, and reaches the lower limit position.

Further, when the holder 10 is lowered, the holder 10 is supported by the chassis 7 via the holder arm 41 and is supported by the clamper 9, and the clamper 9 is supported by the chassis 7 via the clamper arm 32. This holder 1
0 rotates the holder arm 41 and the clamper arm 32 in a slight arc shape in the front and back direction (arrow
P ₂ , P ₁ direction). Therefore, the spline shaft 65, whose upper end is supported by the holder 10, tilts slightly in the front-rear direction at its upper end. Here, the spline shaft 65 is configured to be able to tilt relative to the spline joint 63 as described above. Therefore, at this time, power is transmitted from the spline joint 63 to the spline shaft 65 without any problem.

On the other hand, as shown above, disk magazine case A
is placed in a fixed position where it can be played, the 21st
As shown in FIG. c, the push rod 93 of the push switch 94 comes into contact with the stopper 110. This cancels the loading mode and enters the playback (performance) mode. That is, when the push rod 93 comes into contact with the stopper 110, the push rod 93 is relatively pushed slightly in the direction of arrow _P2 , and then the push rod 93 projects in the direction of arrow _P1 by the action of a spring (not shown). do. This turns off the push switch 94. When the push switch 94 is turned off, the control circuit reverses the feed loading motor 85 after a certain time lag. Furthermore, the slide hook 96 is moved back in the direction of arrow _P3 by the force of the return spring 98. When the motor 85 is driven in the reverse direction, the head base 82 is moved in the direction of arrow _P2 , as shown in FIG. 21d. In addition,
When the head base 82 moves at this time, the engagement stepped portion 81 separates from the engagement portion 21, so the carrier 8 remains at that position. When the head base 82 moves in the direction of arrow _P2 , the signal reading section 81a of the pickup head 81 moves directly below the laser beam introduction hole 4 of the disk magazine case A in the direction of arrow _P2 . When the signal reading section 81a reaches the lead-in position of the disk 1, the head base 82 comes into contact with a limit switch (not shown), thereby stopping the feed loading motor 85 and the movement of the head base 82.

By detecting the lead-in position described above, the disc drive motor 75 is turned on and the turntable 76 is turned on.
rotates, and the disk 1 rotates together with this turntable 76. Further, the feed loading motor 85 is turned on each time the tracking servo by the tracking mirror or the like reaches its limit, and moves the pick up head 81 by a predetermined amount in the direction of arrow _P1 . In this way, the signal reading section 81a of the pickup head 81 properly reads the signals recorded on the disc 1 through the laser beam introduction hole 4, and the disc is reproduced.

When the reproduction of the disc 1 is completed, a lead-out detection device (not shown) detects the final end of the track on which the signal of the disc 1 is recorded, and this detection signal is sent to the control circuit. The control circuit is
Based on the above signal, the feed loading motor 85 is switched from the reproduction mode to the eject preparation mode. As a result, the head base 82 becomes
Move the pick up head 81 away from the disk 1 to the state shown in FIGS. 21e to 21f, and
P Move in _one direction. Then, the push rod 83 of the push switch 94 comes into contact with the stopper 110, and the push switch 94 is turned on. At this point, the device shifts to eject mode. That is, at this time, the push rod 93 is at the stopper 1.
10 and is moved in _{the two} directions of arrow P,
The slide hook 96 projects in the direction of arrow _P4 .
Then, the control device turns on the feed after a certain time lag after the push switch 94 is turned on.
The loading motor 85 is reversed. This causes the head base 82 to move in the direction of arrow _P2 .
Here, since the slide hook 96 protrudes in the direction of arrow _P4 , this slide hook 96
As shown in Figure 1g, it engages with the engaging portion 21 of the carrier 8 and moves the carrier 8 in the direction of arrow _P2 .
When the carrier 8 is moved in the direction of arrow _P2 , the carrier lug gear 17 rotates the carrier pinion gear 62 in the same way as during loading described above, which rotates the spline shaft 65 and the friction plate 67, and the loading pinion gear 68 rotates. Rotate. At this time, the loading pinion gear 68 rotates in the opposite direction to that during loading, and moves the disk magazine case A in the direction of arrow _P2 . The rear end of the disk magazine case A is the actuator 4 of the loading switch 48.
9, the control circuit turns off the feed loading motor 85, thereby terminating the eject mode. Thus, the apparatus returns to the initial state as shown in FIG. 21h, and in this state the disk magazine case A can be taken out from the main body B of the apparatus.

According to this disc reproducing apparatus, since the clutch mechanism 70 is provided in the loading mechanism 111, the following effects can be obtained in the above-mentioned disc reproducing operation.

First, place the disk magazine case A into the holder 10.
It is conceivable that the insertion position of the disk magazine case A may vary depending on the operator, and that the meshing position of the loading pinion gear 68 with respect to the rack gear 5 will differ depending on the operator. Even if the disk magazine case A is inserted into the holder 10 more than necessary, the rack gear 5 will cause the loading pinion gear 68 to idle, so the friction plate 6
No excessive force is applied to the drive system on the 7 side. In this case, even if the operator does not release the disk magazine case A even though the loading operation has started, the loading pinion gear 68 may slip against the rotating friction plate 67, causing the drive No excessive force is applied to the system.

Furthermore, even if the disk magazine case A is accidentally pulled out from the holder 10 before the eject operation is completely completed, the loading pinion gear 68 slips and rotates against the friction plate 67 in the same manner as above, causing the drive The system can be protected from excessive force.

Furthermore, even if vibrations etc. are applied to the disk reproducing device B during loading and are transmitted to the disk magazine case A, this vibration can be absorbed between the loading pinion gear 68 and the friction plate 67, and the loading operation There will be no hindrance to this.

In particular, according to each configuration of the embodiments described above,
The following effects can also be obtained.

First, since the carrier pinion gear 62 and the loading pinion gear 68 are spline-coupled, even when the loading pinion gear 68 side is moved in response to the movement of the case A, power transmission between these gears can be performed extremely smoothly. .

Furthermore, the loading pinion gear 68 is configured to have a larger diameter than the carrier pinion gear 62, and the gear ratio to the carrier pinion gear 62 is configured to be larger than 1. In combination with the clutch mechanism 70 described above, the case A is provided with sufficient driving ability and disturbance tolerability to always reliably transport the case A to a fixed position. For example, in this disk reproducing device B, the tip of the disk magazine case A comes into contact with a stopper in the holder 10 during loading, and the movement of the disk magazine case A and the rotation of the loading pinion gear 68 are stopped. There is a state in which the friction plate 67 is lowered, but at this time, even if the disk magazine case A is moved in the direction of coming out of the holder 10 (direction of arrow P ₂ ) due to disturbance such as external vibration, the friction plate 67 that is rotating at that time By rotating the loading pinion gear 68, the disk magazine case A is returned to its original position, and the loading operation can be performed reliably in this case as well.

Further, the carrier 8 is equipped with a cam (both cams 19), and the cam and the clamper 9 are engaged with each other to drive the clamper 9 as the carrier 8 moves. The operation can be realized with a simple configuration.

Further, the carrier 8 is provided with another cam (cam protrusion 16), and this cam is configured to engage with a support portion (clamping arm 55) of a biasing device for biasing the clamper 9. Since I configured it as
As the carrier 8 moves, the biasing force of the clamper 9 can be changed, making it possible to apply a more appropriate biasing force to the vertical movement of the clamper 9.

In addition, in the disk playback device, since the left and right carriers 8, 8 are moved in synchronization with the synchronized pinion gears 24, 24 and the shaft body 23, the movement of the clamper 9, which is driven by the carriers 8, 8, does not involve unnecessary movements other than vertical movement. This allows the device to operate smoothly, and the structure for synchronization is simple and the device can be made thin.

[Effect of idea]

According to this invention, since a clutch mechanism is provided in the drive system of the loading device that transports the case containing the disk, there is no possibility that external disturbances such as vibrations are applied to the case, and that there is no variation caused by the operator when inserting the case into the device. Even if this occurs, an effect can be obtained in that no unreasonable force is applied to the drive system of the loading device, and the loading operation can be performed reliably.

[Brief explanation of drawings]

The drawing shows an example of this invention.
1 is a side view of the disc playback device, FIG. 2 is a side view in line, FIG. 2 is a plan view of the disk playback device, and FIG. 3 is a side view in line,
4 is a front sectional view taken from FIG. 2, FIG. 5 is a front sectional view taken from FIG. , FIG. 8 is a front view of the same, FIG. 9 is a sectional view taken from the line shown in FIG. 8, FIG. 10 is a rear view of the carrier, and FIG.
The figure is a side view taken along the line XI-XI of Figure 8, and Figure 12 is a side view of Figure 8.
A side view taken along the line XII-XII, FIG. 13 is an enlarged view of the portion in the direction of the arrow in FIG. 8, FIG. 14 is an enlarged view of the portion in the direction of the arrow in FIG. 9, and FIG. 15 is a plan view of the spline joint and carrier pinion gear. , Fig. 16 is a vertical sectional view taken from Fig. 15, Fig. 17 is a sectional view taken from Fig. 16, Fig. 18 is a front view of the spline shaft, and Fig. 19 shows details of the push switch and slide hook. Perspective view, Figure 20 a~
c and FIGS. 21a to 21h are all explanatory diagrams of the operation of the disc playback device. A...Case (disk magazine case), B
...Equipment main body, 1...Disc, 5...Rack gear, 8...Carrier, 17...Carrier rack gear, 67...Friction plate, 68...Loading pinion gear, 70...Clutch mechanism, 85...Drive Source (feed loading motor), 92...
Feed mechanism, 111...Loading device (loading mechanism).

Claims (1)

[Scope of utility model registration request] In a disk playback device that plays a disk by loading a disk housed in a case into a device main body, the case is formed with a loading rack gear, and the device body is movably supported and has a carrier rack gear. a carrier having a carrier, a drive source for moving the carrier, a carrier pinion gear that is rotatably supported and meshes with the carrier rack gear, and a carrier pinion gear that is rotatably supported and meshes with the rack gear of the case disposed within the device body. 1. A loading device for a disc playback device, characterized in that the carrier pinion gear and the loading pinion gear are connected via a clutch mechanism.