JPS624935Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a recording medium support elevating mechanism in a disc-shaped recording medium playback device, which prevents the disc-shaped recording medium stored in a case from being inserted into the playback device. By displacing the support lifting lever, lock lever, etc. in conjunction with the insertion operation of the case without driving the recording medium support by the support lifting/lowering motor, the lower part of the case insertion path can be easily and reliably reproduced. A recording medium support elevating mechanism configured to move the recording medium support to a certain position.

An embodiment of the present invention will be described below with reference to the drawings. 1 and 2 are a schematic perspective view and a schematic longitudinal sectional front view showing the internal structure of an embodiment of a disk-shaped recording medium reproducing device, respectively, and FIGS. 3 to 5 show a recording medium support elevating mechanism according to the present invention. FIGS. 6 and 7 are plan views of essential parts of one embodiment in different operating states, and are plan views for explaining the operation of the lifting mechanism lock lever when it is unlocked and when it is locked, respectively.

In FIGS. 1 and 2, a reproducing device 1 is for reproducing signals recorded on a signal recording surface of a disk-shaped recording medium (hereinafter referred to as a disk) 2. As shown in FIG. In this embodiment, in addition to the configuration described in the above object section, the disk 2 cannot be inserted unless, for example, the plug 3a at the end of the power cord 3 is connected to a power terminal (not shown). Also, the disc 2 is constructed to prevent so-called double insertion of the disc 2 so that another disc 2 is not inserted during playback.

In addition, in this embodiment, especially when the power cord 3 is accidentally connected while the disc 2 is inserted into the playback device,
If the disk 2 is pulled out, the disk 2 in the standby position is automatically lowered to the playback position to prevent the disk 2 from being deformed. Furthermore, if the power is cut off during the insertion or recovery operation of the disk 2, the configuration is such that the disk 2 can be reliably mounted and recovered by prohibiting the lowering.

The disk 2 is housed in a case 4, and the opening of the case 4 is covered with a removable lid 5. Therefore, the disk 2 is inserted while being housed in the case 4, and the case 4 is inserted into the opening of the playback device 1 with the lid 5 side facing up. The opening of the playback device 1 is provided with an opener 6 for opening the inserted case 4, and the opener 6 includes a slider 9a, which is movable on a pair of guide rails 8a, 8b on the chassis 7. Both ends are supported by the case 9b, and its opening is opened in conjunction with the insertion operation of the case 4. A guide pin 10 is provided as a guide on the lower surface of one slider 9a, and as shown in FIGS.
An incorrect insertion prevention lever 1, which will be described later, is placed on the path 10a of the
1. Each end of the lifter lock lever 12, the lifter elevating lever 13, and the lock lever 14 that locks the lifter elevating and lowering lever 13 is provided so as to be freely movable in and out.

First, the overall playback operation of the playback device 1 will be outlined.

As the case 4 is inserted, the lifter 15 as a disc-shaped recording medium support is located at a standby position on the insertion path.
is lowered to the playback position, which is at the same height as the rotating surface of the turntable 16, and removed from the disk insertion path. When the case 4 is further inserted, both ends of the lid 5 are clamped and latched between rods 17a, 17b and rods 18a, 18b provided on both sides of the back of the playback device 1, respectively. And case 4
The inner disk 2 is clamped between a pair of clamp members 19 and 20 provided at the rear center of the playback device 1.

After the lid 5 is latched and the disk 2 is clamped in this way, when the case 4 is pulled out of the playback device 1, the disk 2 is moved to the lifter 1 in the standby position.
The central portion is supported on the reproducing device 1 and remains in the reproducing device 1. Next, when regeneration is started by operating a regeneration button (not shown) or the like, the clamp members 19 and 20 release the clamp, and the lifter 15 in the standby position
is lowered to a playback position substantially on the same plane as the rotating surface of the turntable 16. As the lifter 15 descends to the playback position, the disk 2 moves onto the turntable 16.
It is placed on top and is ready for playback.

At the same time, the turntable drive motor 21 is driven, and the turntable 16 is rotationally driven.
Carrier 2 movable left and right inside the playback device 1
A signal recorded on the signal recording surface of the disc 2 is reproduced by a pickup mechanism 24 provided at the disc 3.

When the playback is completed, the carrier 23 returns to its original position, and after the rotation of the turntable 16 stops, the lifter 15 rises and returns from the playback position to the standby position, and the disk 2 moves back to the clamp member 1.
9 and 20. By inserting the empty case 4 into the playback device 1 in this state, the disk 2 and the lid 5 are housed in the case 4 in this order. When the case 4 is inserted to the innermost part, the disk 2 is unclamped and the lid 5 is unlatched, and the lid 5 is connected to the opening of the case 4. Therefore, inserted case 4
By pulling out the disc 2 and the case 4, the disc 2 is taken out of the playback device 1.

Next, the elevating mechanism of the lifter 15 will be explained.

The turntable drive motor 21 is connected to the chassis 7
A center spindle 25 is attached to the tip of the motor shaft 22.
The outer peripheral tapered surface of the center spindle 25 has a diameter that fits into the inner diameter of the disk 2. A ring-shaped lifter 15 with a slightly larger diameter than the outer diameter of the center spindle 25 is provided in the center of the turntable 16 as a disc-shaped recording medium support, and is movable up and down within a predetermined range. As the letter-shaped elevator 26 moves up and down, it is displaced between the standby position at the upper end and the playback position at the lower end.

The base of the elevator 26 is fitted into a guide column 27 installed on the chassis 7 so as to be slidable in the vertical direction, and is pulled up and down by a wire 28 to be raised and lowered in the vertical direction. The wire 28 has one end connected to the elevator 26.
It is first wound around a roller 29 near the guide column 27 and changed its direction from vertical to horizontal, and then wound around a roller 30 provided on the lower surface of the lifter elevating lever 13 in the opposite direction. The other end is connected to a reel 32 that is integrated with the disc cam 31. A gear 33 having teeth formed on a part of its outer periphery is coaxially and integrally provided on the disc cam 31, and this gear 33 transmits forward and reverse rotational power to a lifting motor 34 via a reduction gear mechanism to be described later. be done. The rotational power of the lifting motor 34 is transmitted to the belt 3 from a pulley 35 attached to the motor shaft 34a.
6 to the pulley 37, the gear 38 coaxially integrated with the pulley 37 to the gear 39, and further transmitted to the large diameter gear 40 by the small diameter gear 39a coaxially integrated with the gear 39, and the lower surface of the large diameter gear 40. The signal is transmitted to the final stage gear 33 by a gear 40a that is coaxially integrated with the gear 33.

The driven-side pulley 37 and gear 38 are pivotally supported by the end of a rotating lever 42 that is pivotally supported on a shaft 41, and as the rotating lever 42 rotates, the gear 38 comes into contact with the gear 39. Separate. One end of a coil spring 43 is locked to the other end of the rotating lever 42.
The rotating lever 42 is biased counterclockwise in the figure by the spring force of a spring 43. Also, the rotating lever 42
At the other end, there is a plunger on the opposite side from the spring 43.
One end of the plunger 44p of the solenoid mechanism 44 is locked, and when the regenerator 1 is connected to the power source, the solenoid 44s is energized and the plunger 4
4p is attracted, and the state shown in FIG. 3 changes from the state shown in FIG. 4. Therefore, when the power is connected, the rotating lever 42 is rotated clockwise about the shaft 42a against the spring 43, and the gears 38 and 39 mesh with each other.

Further, since the lifting motor 34 is energized and driven in the normal direction at the same time as the power plug 3a is connected, the gear 3
3 rotates counterclockwise in the figure. As a result, the reel 32 winds up the wire 28, so that the elevator 26 is lifted upward, and the lift 15 rises from the playback position to the standby position.

Here, cam grooves 45 and 46 are formed at two places on the outer periphery of the disc cam 31, and one end of the two L-shaped levers 47 and 48 is attached to the corresponding cam groove 4.
5, 46. In this embodiment, the lifter 15
When the lever 47 is in the regeneration position, the other end of the lever 47 is engaged with the cam groove 45, as shown in FIGS. 3 and 4, and when the lifter 15 is raised to the standby position, one end of the lever 48 is As shown in FIG. 5, it engages with the cam groove 46 and locks the disk cam 31.
Further, the locking operation at that time causes the other end of the lever 48 to actuate the actuator 49a of the micro switch 49 for stopping the lifting motor 34. When the micro switch 49 is operated, the electric power to the lifting motor 34 is cut off and the lifting motor 34 is stopped.

In this way, by connecting the power plug 3a, the lifter 15 is driven upward to the standby position. and,
In this standby state, the wire 28 is pulled downward by the weight of the movable parts such as the elevator 26 and the lifter 15 attached thereto, but the disc cam 31 is locked by the lever 48. Therefore, the wire 28 will not be rewound.

Here, when the power plug 3a connected to the power terminal is pulled out, the power to the solenoid 44s is cut off at the same time as the plug 3a is pulled out, and the rotating lever 42 is rotated counterclockwise by the force of the spring 43. . At this time, the rotating lever 42 rotates the lever 48 in the direction away from the cam groove 46, so that the lever 48 is disengaged from the disc cam 31, and the lifter 15 and elevator 26 are moved to the standby position by their own weight. to the playback position, and the third
The state shown in the figure will be reached. In this manner, when the lifter 15 descends to the regeneration position, one end of the other lever 47 engages with the other cam groove 45 of the disc cam 31, and the disc cam 31 is also locked at the regeneration position.
Incidentally, during regeneration, the lifter 15 is lowered to the regeneration position by reversing the lifting motor 34.

Note that the playback device 1 of this embodiment is designed to take into account the case where the playback button is not pressed immediately after the disk 2 is installed in the playback device 1, so that the playback device 1 does not play the disk 2, for example.
The solenoid 44s is configured to operate a timer (not shown) when a certain period of time has elapsed after the solenoid 44s is inserted, and automatically cut off the current to the solenoid 44s. In this case, the rotation of the lever 48 releases the lock on the disc cam 31, whereby the lifter 15 automatically descends from the standby position to the regeneration position. Therefore, the disk 2, which has been in an irregular supported state only by the lifter 15 at the standby position, is lowered to the playback position and supported on the turntable 16 without being left in that state for a long period of time, and thereby the playback device 1 Deformation of the disk 2, which is susceptible to deformation due to the influence of internal heat, can be effectively prevented.

This function of preventing deformation of the disk 2 by automatically lowering the lifter 15 is similarly performed even in the case where the disk is left in the playback device 1 and the power is turned off.

In this way, when the playback device 1 is not connected to the power source, the lifter 15 is at the playback position at the same height as the rotating surface of the turntable 22, and when the disk is inserted or recovered, the lifter 15 Clamp members 19, 2 that clamp the
0 is also in a fully expanded unclamped state. Therefore, if the disc 2 is inserted in this state, there is a risk that the disc 2 will fall out within the playback device 1. Therefore, it is necessary to prevent erroneous insertion before connecting the power supply, and the operation for preventing erroneous insertion will be explained below.

Reference numeral 50 denotes a substantially quadrant-shaped cam that cooperates with the erroneous insertion prevention lever 11, and is provided coaxially and integrally with the disk cam 31. The incorrect insertion prevention lever 11 is biased clockwise in the figure about the shaft 11a by the spring 51, and one end thereof is in contact with the circumferential surface of the cam 50. When the cam 50 is in the playback position, one end of the incorrect insertion prevention lever 11 rests on the small diameter cam surface 50a of the cam 50, and the other end rests on the guide pin 10.
The vehicle is entering the path 10a of the vehicle. For this reason, the slider 9a of the opener 6 is locked so that it cannot move forward, and therefore the disk 2 cannot be inserted.

Although the above-mentioned inconvenience can be eliminated by preventing erroneous insertion of the disk before the power is connected in this way, the erroneous insertion prevention function provided by the erroneous insertion prevention lever 11 also works effectively during playback of the disk 2.
It is a matter of course for such a playback device 1 to prevent so-called double insertion, where another disk is inserted while playing back disk 2. By preventing erroneous insertion of the disk 2, safe insertion of the disk 2 can be further ensured.

When the lifter 15 rises to the standby position due to the connection of the power plug 3a, the cam 50 rotates with the rotation of the gear 33, and the erroneous insertion prevention lever 1
One end of the lever 11 rides on the large-diameter cam surface 50b, and the lever 11 rotates counterclockwise. As a result, the other end of the lever 11 moves out of the path 10a of the guide pin 10, and the slider 9a is released from being locked by the guide pin 10. Therefore, the disk 2 can be inserted by connecting the power plug 3a.

Here, as described above, when the case 4 containing the disk 2 is inserted into the opening of the opener 6 and pushed into the playback device 1, as the sliders 9a and 9b move forward, one end of the case 4 is pushed into the guide pin 10. The lifter lock lever 12, which had been abutted and locked, is attached to the shaft 1.
The guide pin 10 can rotate on the path 10a around the guide pin 2a. At this time, since the gear 33 is in the regeneration position, the cam groove formed on the outer periphery of the gear 33
The other end of the lifter lock lever 12 faces 2. Therefore, when the rotation prevention state of the lock lever 12 is released by the movement of the guide pin 10, the lock lever 12 is rotated clockwise by the spring force of the spring 53, and the other end is rotated as shown in FIG. engages with the cam groove 52. As a result, the gear 33 is locked in the standby position by the lock lever 12, but as mentioned above, the disc cam 31, which is coaxial with the gear 33, is already locked in the regeneration position by the lever 48. Gear 33, disc cam 3
1, reel 32, etc. are in a double lock state.

In this way, after the case 4 is inserted into the playback device 1, the reel 32 is brought into a double lock state by the lever 48 and the lock lever 12. Therefore, if the power cord 3 is accidentally stepped on and the power plug 3a comes off from the power terminal while inserting the case 4, the power supply to the solenoid 44s is de-energized and the lever 48 is turned off. Although the plate cam 31 is unlocked, the gear 33
is locked by a lock lever 12.
Therefore, in such a case, even if the power is cut off, the lifter 15 is locked in the standby position, and the lifter 15 will not be lowered while the case 4 is being inserted.

Now, suppose that the lifter 15, which should be in the standby position, is lowered while the case 4 is being inserted, and at the same time the lifter 15 is lowered, the disk clamp members 19 and 20 are also completely unclamped.
Therefore, when the case 4 is inserted for the purpose of mounting the disk 2, the inserted disk 2 is not clamped, so the disk 2 may be thrown out inside the playback device 1 when the case 4 is pulled out. As a result, recovery using normal methods becomes difficult, and even if recovery is possible, there is a risk of significant damage to the signal recording surface.

Furthermore, when inserting the case 4 for the purpose of recovering the disk 2, since the lifter 15 has been lowered when the empty case 4 is inserted, there is a gap between the opening of the case 4 and the disk to be recovered. This causes the inconvenience that the height of the disk 2 is shifted and the disk 2 cannot be recovered into the case 4.

Since the playback device 1 is configured so that the lifter 15 will not fall even if the power is cut off while the case 4 is being inserted, this type of inconvenience can be reliably prevented. This allows safe and reliable insertion and retrieval of the disk 2.

Next, the elevating and lowering operation of the lifter 15 by the lifter elevating lever 13 when inserting the disk 2 will be explained.

When the guide pin 10 is displaced to the position shown by the dashed line in FIG.
The lever 13 is pushed and rotated clockwise about the shaft 12a against the spring 54 by coming into contact with one end of the lifter elevating lever 13 that closes the shaft 12a.

A lock lever 14 for locking the lever 13 is pivotably supported below the lever 13 so as to be pivotable in a click-like manner about a shaft 14a. As shown in FIGS. 6 and 7, one end of the lock lever 14 is divided into a pair of legs 55 and 56, and the other end is engaged with an engaging protrusion 57 of the lifter elevating lever 13 from the inside. An engaging pin 58 is implanted. 59
is a torsion spring that presses the lock lever 14 in a click-like manner.
One end is locked to the chassis 7, and the other end is locked to a proper position on the chassis 7.

When the guide pin 10 is displaced to the position shown by the two-dot chain line in FIG. 5, the guide pin 10 comes into contact with one leg 55 and pushes it in the advancing direction as shown in FIG. 6. As a result, the spring locking pin 60 is attached to the shaft 14.
When the lock lever 14 crosses the line connecting the other end of the spring 59 and the other end of the spring 59, the lock lever 14 rotates clockwise in a clicking manner, and the engagement pin 58 moves to the position shown by the two-dot chain line in FIG. It engages with the engagement protrusion 57. As a result, the lifter elevating lever 13 is locked in the state shown by the two-dot chain line in the figure.

In this way, as the guide pin 10 passes, the lifter lifting lever 13 is rotationally displaced from the position shown by the solid line to the position shown by the two-dot chain line, that is, from the state shown in FIG. 6 to the state shown in FIG. 7. The wire 28, which had been under tension by being attached to the roller 30 on the lower surface of the lever 13, is loosened, and the lifter 15 and elevator 26 are lowered by their own weight to the regeneration position.

In this way, as the case 4 is inserted, the lifter 15 can be lowered to the playback position where it does not interfere with the insertion of the case, without driving the lifter lifting/lowering motor 34 in reverse.

Here, the force required to rotate the lifter elevating lever 13 can be adjusted as appropriate by varying the tension of the spring, so that anyone can insert the case 4 with a small amount of force.

Once the lifter 15 is locked in the playback position,
It remains in this state while the case 4 is inserted, and is unlocked by the guide pin 10 when the disk 2 is finished clamping and the empty case 4 is pulled out. In this case, when the guide pin 10 has retreated to the position shown by the three-dot chain line in FIG. 5, it comes into contact with the other leg 56 of the lock lever 14 and pushes the lock lever 14 counterclockwise. And lock lever 14
With this rotation, the engagement between the engagement pin 58 and the engagement protrusion 57 is released, and the lifter elevating lever 13 returns to the position shown by the solid line in FIG.

In this way, when inserting and pulling out the case 4, the disc cam 31 is kept in the standby position by the guiding action by the guide pin 10, and the lifter 15 is moved out of the way of case insertion with the rotating action of the lifter elevating lever 13. It can be extremely easily lowered to the playback position where it should not be.

As described above, the recording medium support lifting mechanism in the disc-shaped recording medium reproducing apparatus according to the present invention is driven up and down between the standby position above the turntable and the playback position on the turntable by the operation of the lifting motor. The support lifting lever and its lock lever are displaced by a guide that is displaced in relation to the insertion operation of the case, and the recording medium support is placed on standby by its own weight without the power of the lifting motor. Since the configuration is such that the recording medium support is lowered from the position to the playback position, the lifting motor and its power transmission mechanism that drive the recording medium support up and down are kept in the standby position, and only the recording medium support is moved to the case by displacement of the lifting lever. The lifting lever can be lowered to the regeneration position where it does not interfere with insertion, and the lifting lever guided and displaced by the guide element can be regenerated by the displacement of the lock lever which is also pressed and displaced by the displacement of the guide element. This allows the lifting lever to be displaced via the guide by the pressing force generated by inserting the case without relying on the power of the lifting motor when inserting the case. When the recording medium support is pulled out in the opposite direction, the lock by the lock lever is released by the displacement of the guide, and the recording medium support is raised to the standby position against its own weight as the support lift/lower lever is returned to its original position. Furthermore, since the main part can be constructed simply by assembling the support lift lever and the lock lever in an appropriate positional relationship on the path of the guide, the construction is simple.

[Brief explanation of the drawing]

1 and 2 are a schematic perspective view and a schematic longitudinal sectional front view showing the internal structure of an embodiment of a disk-shaped recording medium reproducing device, respectively, and FIGS. 3 to 5 show a recording medium support elevating mechanism according to the present invention. FIGS. 6 and 7 are plan views of essential parts of one embodiment in different operating states. FIGS. 6 and 7 are plan views for explaining the operation of the lifting mechanism lock lever when it is unlocked and when it is locked, respectively. DESCRIPTION OF SYMBOLS 1... Reproduction device, 2... Disc, 4... Case, 10... Guide pin, 13... Lifter elevating lever, 14... Lock lever, 15... Lifter, 1
6... Turntable, 34... Lifting motor.

Claims (1)

[Scope of utility model registration request] A disc-shaped recording medium taken out from a case in the apparatus is supported on a recording medium support at a standby position on the case insertion path, and during playback, the recording medium support is turned by the power of the motor for raising and lowering the support. In a disk-shaped recording medium playback device that is lowered to a playback position on a table and placed on the turntable to make it playable, the playback is performed integrally with the case as the case is inserted. A guide element that is displaced within the apparatus, and a recording medium support that is guided and displaced by the guide element and is at the standby position is lowered to the playback position by its own weight independently of the motor for raising and lowering the support. A support elevating lever and a lock lever that is guided and displaced by the guide and enters the displacement locus of the support elevating lever and locks the support elevating lever so that it cannot be returned to its original position, and the case is inserted. When the recording medium support is pulled out in the opposite direction, the lock by the lock lever is released by the displacement of the guide, and as the support lift lever returns, the recording medium support moves against its own weight to the standby position. A recording medium support elevating mechanism in a disc-shaped recording medium reproducing apparatus configured to be raised to a height of 1.