JP2003120776A - Differential gear, and disc regenerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To further thin a device by simplifying an interlock mechanism having time difference. SOLUTION: When motion from a side surface rack 13 of a second cam 14 is transmitted through a first pinion 15 and a second pinion 16 to a shift plate 17, rotation of the second pinion 16 is not transmitted to a rack part 18 of the shift plate 17 while a tooth-eliminated range b of the second pinion 16 passes. Teeth a of the second pinion 16 are engaged with teeth d of the rack part 18 of the shift plate 17 after the tooth-eliminated range b of the second pinion 16 has passed. Time difference action is thus achieved by simple constitution. When this mechanism is applied to an on-vehicle disc regenerator, a feed roller is separated from a disc after clamping of the disc is completed, and a suspension chassis is unlocked after that.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a differential device which performs a time difference operation and a disc reproducing device using this differential device.

[0002]

2. Description of the Related Art In the case of a disc reproducing apparatus capable of reproducing discs such as CDs, MDs and DVDs, a portable or in-vehicle apparatus is required to be smaller and lighter than a stationary apparatus. Further, in the case of an on-vehicle device, a large vibration is applied from the vehicle, and therefore a suspension chassis provided with a vibration isolation mechanism is used to block this. The suspension chassis is supported by the lower chassis by an oil damper, and is normally locked by the lower chassis, and is unlocked at the time of reproduction to be supported by the oil damper in a floating state. Therefore, a suspension lock mechanism is provided between the lower chassis and the suspension chassis. Further, the on-vehicle disc reproducing device is a feed mechanism for conveying the disc into the device and ejecting it to a predetermined position, and a disc clamp mechanism for clamping the disc conveyed at the reproducing position on the turntable and unclamping after the reproduction is completed. , An optical pickup mechanism for reproducing a disc, and an interlocking mechanism for interlocking these mechanisms with necessary operation timing. The in-vehicle disc reproducing device can be miniaturized for in-vehicle use by properly arranging such a mechanism.
It has been made thinner and lighter.

[0003]

However, in the case of a device to which vibration is applied from the outside, such as a disc reproducing device for a vehicle, when the disc is inserted into the device, the disc is moved by the vibration of the vehicle and the correct reproducing position is obtained. May not be clamped to. In order to prevent this, it is necessary to set the operation timing so that the feed roller is separated from the disc after the disc is clamped and then the suspension chassis is unlocked. On the contrary, when ejecting the disc, it is necessary to lock the suspension chassis, bring the feed roller into contact with the disc, and then unclamp the disc. Conventionally, a complicated interlocking mechanism has been required to obtain such operation timing with a time difference, which has been an obstacle to downsizing of the apparatus.

The present invention has been made in order to solve such a conventional problem, and simplifies the interlocking mechanism with a time difference, and further reduces the thickness of the differential device. An object is to provide a disc reproducing device using this.

[0005]

In order to solve the above-mentioned problems, a differential device according to the present invention comprises a first pinion driven by a rack plate, a second pinion meshing with the first pinion, and a second pinion. A shift plate having a rack portion meshing with the pinion at one end and an engaging portion for transmitting a motion to another member at the other end, and the second pinion is a part of a lower part of surrounding teeth. It is characterized in that it has a portion with teeth removed in the range, and the rack portion of the shift plate is engaged with the lower portion of the second pinion. With this configuration, when the motion from the rack plate is transmitted to the shift plate through the first pinion and the second pinion, the rotation of the second pinion is performed while the tooth-cut portion of the second pinion passes. Since the rotation of the second pinion is not transmitted to the rack portion of the shift plate, but the rotation of the second pinion is transmitted to the rack portion of the shift plate after passing through the portion where the teeth of the second pinion are cut off, a time difference operation can be obtained with a simple configuration. You can

Further, the differential device of the present invention is characterized in that a predetermined amount of space is provided between the tip tooth and the next tooth of the rack portion of the shift plate meshing with the lower portion of the second pinion. is there. With this structure, when the tooth of the second pinion is cut off and the tooth of the second pinion first meshes with the tip tooth of the rack portion of the shift plate, the tooth of the second pinion is moved to the rack of the shift plate. It is possible to mesh smoothly and surely with the tip teeth of the part.

Further, in the differential device of the present invention, the first pinion of the tooth of the second pinion cut away is located at a position adjacent to the tip tooth of the rack part of the shift plate. It is characterized by having a fixed position. With this configuration, the first tooth of the second pinion can surely mesh with the tip tooth of the rack portion of the shift plate, and the rotation of the second pinion can be reliably transmitted to the shift plate with a time difference operation.

Further, the differential device of the present invention comprises an actuating lever arranged on the other end side of the shift plate, and a pressing portion for pressing the actuating lever at the other end part of the shift plate,
The pressing portion has a shift hole for projecting a shift pin projecting from one end of the operating lever, and a guide groove for projecting a guide pin projecting from another end of the operating lever, and the shift plate has a fixed position. When it is positioned at, the rotation of the operating lever is locked by the engagement of the guide groove and the guide pin. With this configuration, since the operating lever is locked when the shift plate is in the fixed position, it is possible to prevent malfunction due to rotation of the operating lever when not in use.

Further, in the differential device of the present invention, a predetermined amount of space is provided between the shift hole and the shift pin, and the shift hole moves the shift pin after the shift plate moves by the space. It is characterized in that the operating lever is rotated by pressing. With this configuration, it is possible to give a time difference operation from the shift plate to the operating lever,
The operating lever can be operated after unlocking the operating lever.

Further, the disk reproducing apparatus of the present invention comprises a feed roller for transferring the disk into and out of the apparatus, and a disk clamp mechanism for clamping the disk transferred into the apparatus on a turntable provided on the suspension chassis. A suspension lock mechanism for holding the suspension chassis in a floating state during reproduction of the disc, the feed roller is separated from the disc after the disc is clamped, and then the suspension chassis is unlocked. The above-mentioned differential device is used as a lock differential mechanism for this. This configuration allows the feed roller to be released from the disc after the disc has been clamped, and then the suspension chassis to be unlocked so that it will be applied to the disc even when the device is used under vibration. Prevent vibration,
It is possible to perform playback with the disc securely fixed to the turntable.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a schematic configuration of a vehicle-mounted disc reproducing apparatus according to an embodiment of the present invention. Three oil dampers 2 as a vibration isolation mechanism are fixed to the mounting holes 3 on the upper surface of the lower chassis 1 at the bottom. A rotating shaft of a feed arm 7 having a feed roller 6 at a rear end thereof is rotatably supported by bearings 4 and 5 provided on both sides of a front portion F of the lower chassis 1. A feed motor 8 is arranged on the left side of the front part of the lower chassis 1, and a first gear 9a of a gear train 9 is connected to the rotation shaft of the feed motor 8. An upper rack 11 of a cam plate (rack plate) 10 meshes with the final gear 9b of the gear train 9. As shown in FIG. 5, the cam plate 10 includes a first cam 12 having an upper surface rack 11 formed therein and a second cam 14 having a side surface rack 13 formed therein. A first pinion 15 meshes with the side rack 13 of the second cam 14, a second pinion 16 meshes with the first pinion 15, and a rack portion 18 on the left side of the shift plate 17 meshes with the second pinion 16. . A lock claw 19 is formed on the right side of the rack portion 18 of the shift plate 17, and a planar holding portion 20 is integrally formed on the right side of the shift plate 17. The holding portion 20 has a shift hole 21 and an elongated hole-shaped guide groove 2 having a bent tip portion.
2 is formed. A lock lever 23 (actuating lever) is arranged in the lower portion of the holding portion 20, and the lock lever 23 has a shaft hole 24 in the central portion of the boss shaft 1 of the lower chassis 1.
A shift pin 25, a guide pin 26, and a lock protrusion 27 are provided at the respective ends of the three-pronged shape so as to be rotatably fitted in a. The shift pin 25 is a holding portion 20 of the shift plate 17.
The guide pin 26 projects from the shift hole 21 of the
No. 0 guide groove 22, and the lock protrusion 27 is a locking hole 29 provided on the right side surface of the suspension chassis 28.
Can be engaged with.

The suspension chassis 28 is formed of a resin material, and has a locking hole 30 formed on the left side surface thereof so that the locking claw 19 of the shift plate 17 can be engaged with the locking pin 31. Is formed. A disk drive motor that integrates a turntable 32 is attached to the back surface of the suspension chassis 28, and a circular magnet 33 that can be engaged with a CD insertion hole is provided at the center of the turntable 32. . An optical pickup mechanism for reproducing a disc is attached to an opening 34 formed obliquely rearward to the left from the turntable 32. The suspension chassis 28 has three damper support pins 35, 3 provided so as to project downward.
6, 37, and these damper support pins 35, 36, 3
7 are supported by the oil dampers 2 provided on the lower chassis 1, respectively. Further, a shallow storage recess 38 for storing the switching lever 41 is formed in the left rear portion of the suspension chassis 28, and a shaft hole 3 for rotatably supporting the rotation shaft of the clamp arm 46 is formed on both sides thereof.
9 and 40 are formed.

The switching lever 41 is formed of a metal plate having a spring property, and as shown in FIG.
2 has a receiving projection 43 which is pressed by the inserted disk D at one end, and a pushing projection 44 for pressing the first cam 12 of the cam plate 10 is formed at the other end. Further, there is provided a bending piece 45 which extends from the intermediate portion toward the other end portion and is folded back downward. The bent piece 45 is housed in the housing recess 38 of the suspension chassis 28, and the positioning hole 45 a provided at the tip of the bent piece 45 is provided in the housing recess 38.
It is rotatably fitted to the positioning protrusion 38a provided on the. Mounting hole 42 and positioning hole 45a of switching lever 41
Are located on the same axis.

In FIG. 2, a boss shaft 47, which is rotatably fitted in a mounting hole 42 of a switching lever 41, is formed downward on a clamp arm 46 formed of a metal plate. A support protrusion 48 is formed on the right side of the support protrusion 48, a support protrusion 49 is formed on the right side of the support protrusion 48, and boss shafts 50 and 51 are formed inside the protrusions 48 and 49, respectively. The boss shafts 50 and 51 are rotatably fitted in the shaft holes 39 and 40 of the suspension chassis 28. Further, the guide groove 5 is provided at the front of the clamp arm 46.
2, 53 are formed, and tongues 54, 55 having a spring property are formed inside thereof. Further, the clamper support plate 56 formed of a thin metal plate is formed with a clamper pressing portion 59 at a central portion thereof so as to project forward, and clamper support portions 60 and 61 are formed so as to face both sides thereof. . Clamp arm 4 of this clamper support plate 56
4, the guide pieces 57 and 58 of the clamper support plate 56 are inserted rearward into the guide grooves 52 and 53 of the clamp arm 46 to attach the tongue pieces 54 and 55 of the clamp arm 46, as shown in FIG. Is performed by pressing the projecting pieces on both sides of the clamper pressing portion 59. Then, the disc clamper 62 is attached to the clamper support plate 56 by inserting the flange portion 63 of the disc clamper 62 made of stainless between the clamper pressing portion 59 and the clamper supporting portions 60 and 61.

In FIG. 2, the clamp arm 46 includes
A sliding protrusion 64 is formed to swing the clamp arm 46 in the vertical direction by the movement of the cam plate 10.
Then, after the above mechanism is assembled to the lower chassis 1, the upper chassis 65 is put on the lower chassis 1 and fixed to the lower chassis 1. Guide projections 66, 67, 68 for sandwiching the inserted disc between the feed roller 6 and conveying it are formed on the rear side of the front portion of the upper chassis 65 so as to project to the rear side. These guide protrusions 66, 6
The protrusion amounts of the lower portions 7 and 68 gradually decrease from both side portions to the central portion, so that the inserted disc can be naturally positioned in the central portion.

Next, the operation of this embodiment will be described with reference to FIGS. FIG. 5A is a plan view showing the inside of the disc reproducing apparatus, but it is drawn on the same plane of each member for explaining the operation. 5B is a side view showing the gear train 9 and the first cam 12, and FIG. 5C is a side view showing the second cam 14, the sliding protrusion 64 of the clamp arm 46, and the feed arm 7. Is. 6 and 7
Is a similar diagram. In FIG. 5, the feed arm 7 is in the stopped state before the disc is inserted from the front portion F of the apparatus.
Is tensioned by tension coil springs 69 and 70 so as to urge the feed roller 6 at the rear end portion to rise upward, and the rotation shaft 6a of the feed roller 6 is rotated by the second cam 14.
Is in contact with the lower cam surface 14a. Further, the sliding protrusion 64 of the clamp arm 46 is provided on the upper cam surface 14b of the second cam 14.
, The clamp arm 46 is in a standby state with its front end raised. Further, the fork-shaped rear end portion 14c of the second cam 14 engages with the lock pin 31 of the suspension chassis 28, and the shift plate 1
Since the lock claw 19 of No. 7 is engaged with the locking hole 30 of the suspension chassis 28 and the lock projection 27 of the lock lever 23 is engaged with the locking hole 29 of the suspension chassis 28, these three points cause the suspension chassis 28 is locked to the lower chassis 1. When the disc is inserted in the rearward direction A from the front portion F from this state, the feed motor 8 starts to rotate by the signal from the photosensor that has detected the insertion, and the feed roller 6 is rotated via the gear train 9. Insert the inserted disc into the feed roller 6
It is conveyed in the direction of arrow A by being sandwiched between the guide protrusions 66, 67 and 68 of the upper chassis 65.

When the inserted disc is conveyed to the back of the apparatus, the receiving projection 43 of the switching lever 43 is pushed by the outer periphery of the disc, so that the switching lever 43 rotates counterclockwise and pushes. The piece 44 presses the first cam 12 in the front direction B. As a result, the first cam 12 moves in the direction of arrow B, and the upper surface rack 11 meshes with the final gear 9b of the gear train, so that the first cam 12 and the second cam 14 move in the forward direction B. First cam 12 and second cam plate 10
The cam 14 is relatively movable by a predetermined amount by an internal compression coil spring, and is pushed by the switching lever 41 from the state of FIG. 5 to move the first cam 12 by a predetermined amount and then the second cam 14 is moved. Move with. FIG. 6 shows a state in the middle after the cam plate 10 has moved in this way, and the feed roller 6 is moved by the second cam 14 that has moved.
Is pushed down by the lower cam surface 14a and is separated from the disc, and the lock pin 3 of the suspension chassis 28 is
1 is locked to the fork-shaped rear end portion 14c of the second cam 14, and the other lock claws 19 and the lock projections 27 are also locked to the locking holes 30 and 29 of the suspension chassis. Lower chassis 1
Remains locked in. Then, when the cam plate 10 further advances in the direction of the arrow B, the state shown in FIG. 7 is obtained. In FIG. 7, the moved second cam 14 pushes the feed roller 6 down to the lowest position of the lower cam surface 14a, and the lock pin 31 of the suspension chassis 28 separates from the rear end portion 14c of the second cam 14, The lock claw 1 is operated by the operation of the shift plate 17 in the lock differential mechanism described later.
Since 9 and the lock protrusion 27 are also separated from the locking holes 30 and 29 of the suspension chassis, respectively, the suspension chassis 28 is unlocked by the lower chassis 1 and is in a floating state simply supported by the oil damper 2. Further, the sliding protrusion 64 of the clamp arm 46 is the second
Since the cam 14 is disengaged from the upper cam surface 14b of the cam 14, the clamp arm 46 is rotationally biased by the elasticity of the bent piece 45 of the switching lever 41 so that the front portion is lowered around the rotation axis L. As a result, the disc clamper 62 presses the insertion hole of the disc D against the turntable 32, and the disc clamper 62 is attracted to the magnet 33, so that the disc D is securely fixed on the turntable 32.
When the insertion of the disc D is detected, the disc drive motor starts to rotate and the optical pickup operates to reproduce the disc.

When the reproduction of the disc is completed and the eject button is pressed by the operator, the operation opposite to the above is performed in the order of FIG. 7, FIG. 6 and FIG. That is,
In FIG. 7, when the feed motor 8 rotates in the reverse direction, the cam plate 10 moves in the rearward direction A via the gear train 9, so that the feed roller 6 moves to the lower cam surface 14a as shown in FIG. The lock pin 31 of the suspension chassis 28 is locked to the rear end portion 14c of the second cam 14 as it rises along with it, and the other lock claws 19 and the lock projections 27 are also locked to the locking holes 30 and 29 of the suspension chassis. Then, the suspension chassis 28 is locked to the lower chassis 1. Further, since the sliding protrusion 64 of the clamp arm 46 rides on the upper cam surface 14b of the second cam 14, the clamp arm 46 rotates around the rotation axis L and the disc clamper 62 separates from the disc to fix the disc. To release. Then, the cam plate 10 is further indicated by the arrow A.
When going in the direction, the state shown in FIG. 5 is obtained. In FIG. 5, the feed roller 6 contacts the disc and ejects the disc in the forward direction B.

The above is the overall description of the operation. Next, the lock differential mechanism including the shift plate 17 will be described. The disc reproducing apparatus according to the present embodiment includes a suspension lock mechanism for absorbing vibrations from the vehicle, and locks the suspension chassis to the lower chassis during normal stop. In addition, when inserting the disc, in order to prevent the inserted disc from moving violently due to vehicle vibration and shifting the position of the disc insertion hole, the feed roller is separated from the disc after the disc is clamped, and then the suspension chassis The operation timing is set to release the lock of. On the contrary, when the disc is ejected, the operation timing is set such that the suspension chassis is locked, the feed roller is brought into contact with the disc, and then the disc is unclamped. In the present embodiment, the upper surface cam 14b of the cam plate 10 controls the clamp / unclamp timing of the disk clamper 32, and the lower surface cam 14a of the cam plate 10 controls the contact / separation timing of the feed roller 6 with respect to the disk. Further, a lock differential mechanism is provided in order to lock / unlock the suspension chassis 28 with a time lag in these operations.

The lock differential mechanism in this embodiment is
This is a mechanism for restricting the movement of the shift plate 17 for locking the suspension chassis 28 and shifting the lock timing of the lock claw 19 and the lock lever 23 with respect to the suspension chassis 28. In FIG. 8, the first pinion 15 that meshes with the side surface rack 13 of the first cam 14 has teeth on the entire circumference, but the second pinion 16 that meshes with the first pinion 15 has teeth on the lower half of the entire circumference. Has a tooth cut in a range b between the tooth a and the tooth c. The rack portion 18 of the shift plate 17 also has a space for one tooth between the tip tooth d and the next tooth e. The rack portion 18 meshes with the lower half teeth of the second pinion 16, and the state in which the tip tooth d of the rack portion 18 is adjacent to the tooth c of the second pinion 16 is the fixed differential mechanism. The position (home position). Therefore,
When the second cam 14 is pushed in the B direction from the stopped state of FIG. 5, the side rack 13 of the second cam 14 is moved as shown in FIG.
As a result, the first pinion 15 rotates in the counterclockwise direction and the second pinion 16 also rotates in the clockwise direction, but since there are no teeth in the range b, the second pinion 16 idles, and
As shown in, the teeth a of the second pinion 16 are
After hitting the tooth d, the rack portion 18 starts moving in the direction of arrow C by the tooth a. FIG. 6 corresponds to this state. While the second pinion 16 idles, the second cam 14 further advances and the upper surface cam 14b of the second cam 14 moves.
As a result, the sliding protrusion 64 of the clamp arm 28 descends and the disc clamper 62 moves the disc to the turntable 3
2, the feed roller 6 is separated from the disk by the lower surface cam 14a, but the suspension chassis 28 remains locked.

In FIG. 9, when the tooth a of the second pinion 16 hits the tooth d of the rack portion 18, one tooth is missing between the tip tooth d of the rack portion 18 and the next tooth e. Two
The tooth a of the pinion 16 will hit the tooth d smoothly and reliably. If the tooth f exists between the tip tooth d and the next tooth e, the second pinion 16 may be locked depending on the angle at which the tooth a hits the tooth f, and the device may not operate. is there. Therefore, by cutting off the tooth f, the tooth a of the second pinion 16 surely hits the tooth d,
As shown in FIG. 10, the subsequent engagement between the second pinion 16 and the rack portion 18 is smoothly performed. It should be noted that the range in which the teeth after the tip tooth d of the rack portion 18 are cut off depends on the size of the second pinion 16, and there are cases where a part of the tooth e is cut off together with the tooth f. 18 teeth are not located inside the tip circle of the second pinion 16,
Cut off so that it is outside. The state where the shift plate 17 moves most in the direction of arrow C is the unlocked state of the suspension chassis 28 shown in FIG. 7.

On the other hand, on the opposite side of the shift plate 17,
As shown in FIG. 11, the shift plate 17 is pressed and biased by the tension coil spring 71 in the D direction opposite to the arrow C direction. Therefore, the shift pin 25 of the lock lever 23
Is a shift hole 2 formed in the holding portion 20 of the shift plate 17.
1 is pressed against the edge of the lock lever 23 on the arrow C side.
Is urged to rotate counterclockwise around the shaft hole 24, and the lock projection 27 at the tip of the shaft is attached to the suspension chassis 2.
It is locked in the locking hole 29 of No. 8 and is in a locked state.
Further, since the guide pin 26 of the lock lever 23 is locked by the bent locking portion 22a at the tip of the guide groove 22 formed in the pressing portion 20 of the shift plate 17, the lock lever 23 cannot rotate. Has become. This is because the lock lever 23 rotates to shift the shift plate 1 when the disc reproducing apparatus receives a strong impact such as a drop while the product is being conveyed.
This is a measure for preventing the set timing from being shifted due to the movement of 7.

The state shown in FIG. 11 is the same while the second pinion 16 of FIGS. 8 to 9 idles, and the second pinion 16 and the rack portion 18 of the shift plate 17 mesh with each other so that the shift plate 17 is When the movement in the direction of arrow C is started, as shown in FIG.
Shift pin 2 of the lock lever 23
5 contacts the edge of the shift hole 21 on the arrow D direction side, and the engaging portion 22a of the guide groove 22 of the shift plate 17 moves in the arrow C direction, so that the guide pin 26 of the lock lever 23 engages with the engaging portion. 22a. In this state, the lock protrusion 27 of the lock lever 23 is still locked in the locking hole 29 of the suspension chassis 28 and is in a locked state. Then, when the shift plate 17 further moves in the direction of arrow C, the edge of the shift hole 21 pulls the shift pin 25 of the lock lever 23 in the direction of arrow C.
3, the shaft hole 24 of the lower chassis 1 rotates clockwise around the boss shaft 1a of the lower chassis 1, and the guide pin 26 causes the guide groove 26 to move.
While being guided by the
Start to leave. When this operation is completed, the state shown in FIG. 13 is established, and the suspension chassis 28 is unlocked. FIG. 7 corresponds to this state, and the lock claw 19 on the opposite side of the shift plate 17 is also separated from the locking hole 30. When the reproduction of the disc is completed and the disc is ejected, the operation is the reverse of the above.

Next, the operation for clamping the disc will be described. As described with reference to FIG. 4, the disc clamp portion has a spring-like clamper support plate 56 attached to the front end of the clamp arm 46, and the clamper support plate 56 to attach the disc D to the turntable. And a disk clamper 62 for When the disc reproducing apparatus is in the stopped state shown in FIG. 5, the front end portion of the clamp arm 46 is lifted and the flange portion 63 of the disc clamper 62 is raised, as shown in FIG.
The front end portion of the disk contacts the lower surface of the upper chassis 65, and the clamper support plate 56 bends downward, so that the disk clamper 62 does not project above the upper chassis 65. Therefore, it is possible to reduce the thickness of the device. Further, when the front end portion of the flange portion 63 of the disc clamper 62 hits the lower surface of the upper chassis 65, the disc clamper 62 is in a substantially horizontal state, so that a gap g is formed between the disc D and the disc clamper 62. The tip of the disc D inserted therein does not hit the disc clamper 62, and the disc D can be smoothly inserted.

As described above, according to the present embodiment, the feed mechanism that conveys the disc toward the inside and the outside of the device, and the disc that clamps the disc conveyed inside the device onto the turntable provided on the suspension chassis. It is equipped with a clamp mechanism and a suspension lock mechanism for keeping the suspension chassis in a floating state when the disc is played back, and is pushed by the outer periphery of the disc inserted inside the device to swing to push the cam plate. Since the structure of the switching lever that operates the feed mechanism, the disc clamp mechanism, and the suspension lock mechanism is simplified, it is possible to achieve a thin device. A lock differential mechanism is provided to release the feed roller from the disc after the disc has been clamped, and then to unlock the suspension chassis, ensuring reliable disc insertion and ejection operations. it can. further,
Since a thin plate-shaped clamper support plate having springiness is detachably attached to the front end of the clamp arm, and a disc clamper is detachably attached to this clamper support plate, the assemblability is facilitated and the front end of the clamp arm is When the portion is opened, the disc clamper hits the upper chassis and the clamper support plate bends downward, so that the disc clamper does not project to the upper part of the upper chassis, and the device can be made thin.

Although the above description is an example in which the differential device of the present invention is applied to a disc reproducing device, the differential device of the present invention can be applied to other than the disc reproducing device.

[0027]

As described above, in the differential device of the present invention, the first pinion driven by the rack plate, the second pinion that meshes with the first pinion, and the rack portion that meshes with the second pinion are provided at one end. And a shift plate having an engaging portion for transmitting a motion to another member at the other end thereof.
The pinion has a part where the teeth are cut out in a part of the lower part of the surrounding teeth, and the rack part of the shift plate is engaged with the lower part of the second pinion. When the movement of the second pinion is transmitted to the shift plate through the first pinion and the second pinion, the rotation of the second pinion is transmitted to the rack portion of the shift plate while the tooth-cut portion of the second pinion passes. However, since the rotation of the second pinion is transmitted to the rack portion of the shift plate after the portion where the tooth of the second pinion is cut off passes, the time difference operation can be obtained with a simple configuration.

Further, the disk reproducing apparatus of the present invention comprises a feed roller for transferring the disk into and out of the apparatus, and a disk clamp mechanism for clamping the disk transferred into the apparatus on a turntable provided on the suspension chassis. Suspension lock mechanism to keep the suspension chassis floating during disc playback, and the lock differential mechanism to release the suspension chassis after the feed roller leaves the disc after the disc clamp is completed. As the above-mentioned differential device is used, the feed roller is separated from the disc after the disc is clamped,
After that, the suspension chassis can be unlocked, and even if the device is used in a situation where vibration is applied, vibration applied to the disk is prevented and playback is performed with the disk securely fixed to the turntable. You can

[Brief description of drawings]

FIG. 1 is a schematic exploded perspective view of a disc reproducing device according to an embodiment of the present invention.

FIG. 2 is a partially enlarged schematic exploded perspective view of the disc reproducing apparatus according to the embodiment of the present invention.

FIG. 3 is a schematic perspective view of a swing lever (switching lever) device according to an embodiment of the present invention.

FIG. 4A is a schematic side view of a disc clamp portion according to the embodiment of the present invention. FIG. 4B is a schematic plan view of the disc clamp portion according to the embodiment of the present invention.

5A is a schematic plan view showing a fixed position state of the first cam and the second cam in the embodiment of the present invention. FIG. 5B is a schematic side view showing the first cam and the gear train of FIG. 5A. (C) A schematic side view showing the second cam and the feed arm of FIG. 5 (a).

6A is a schematic plan view showing initial movement states of the first cam and the second cam according to the embodiment of the present invention. FIG. 6B is a schematic side view showing the first cam and the gear train of FIG. 6A. (C) A schematic side view showing the second cam and the feed arm in FIG. 6 (a).

7A is a schematic plan view showing a final movement state of the first cam and the second cam in the embodiment of the present invention. FIG. 7B is a schematic side view showing the first cam and the gear train of FIG. 7A. (C) A schematic side view showing the second cam and the feed arm of FIG. 7 (a).

8A is a plan view showing a fixed position state of a gear meshing portion of the lock differential mechanism according to the embodiment of the present invention. FIG. 8B is a developed sectional view of FIG. 8A.

9A is a plan view showing an initial movement state of a gear meshing portion of the lock differential mechanism according to the embodiment of the present invention, FIG. 9B is a developed sectional view of FIG. 9A.

10 (a) is a plan view showing a final movement state of the gear meshing portion of the lock differential mechanism according to the embodiment of the present invention, and FIG. 10 (b) is a developed sectional view of FIG. 10 (a).

FIG. 11 is a plan view showing a fixed position state of the lock lever portion of the lock differential mechanism according to the embodiment of the present invention.

FIG. 12 is a plan view showing an initial moving state of the lock lever portion of the lock differential mechanism according to the embodiment of the present invention.

FIG. 13 is a plan view showing a final movement state of the lock lever portion of the lock differential mechanism according to the embodiment of the present invention.

FIG. 14 is a schematic side view of a fixed position state of the disc clamp portion according to the embodiment of the present invention.

[Explanation of symbols]

1 lower chassis 2 oil damper 3 mounting holes 4, 5 bearing 6 feed rollers 7 Feed arm 8 drive motor 9 gear train 10 Cam plate (rack plate) 11 Top rack 12 first cam 13 Side rack 14 second cam 15 First Pinion 16 Second Pinion 17 shift plate 18 racks 19 lock claws 20 Presser section 21 shift holes 22 Guide groove 23 Lock lever (operation lever) 24 shaft hole 25 shift pins 26 Guide pin 27 Lock protrusion 28 suspension chassis 29, 30 Locking hole 31 Lock Pin 32 turntable 33 magnets 34 opening 35, 36, 37 Damper support pin 38 Storage recess 39, 40 shaft hole 41 Switch lever 42 mounting holes 43 Receiving piece 44 Pushing piece 45 Folded piece 46 Clamp arm 47 Boss axis 48, 49 Support protrusion 50, 51 Boss shaft 52, 53 guide groove 54, 55 tongue 56 Clamper support plate 57, 58 Guide piece 59 Clamper retainer 60, 61 Clamper support 62 Disc clamper 63 Flange 64 Sliding protrusion 65 upper chassis 66, 67, 68 Guide protrusion 69, 70, 71 Extension coil spring

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 3J062 AA33 AB05 AB26 AB27 AC06                       AC07 BA11 BA12 CA15 CA16                       CA17 CA26 CA36 CB02 CB15                       CB20 CB24 CB27 CB32                 5D046 AA16 AA19 CA11 CB03 CD03                       FA01 FA04 FA08 HA05 HA06

Claims (6)

[Claims] 1. A first pinion driven by a rack plate, a second pinion that meshes with the first pinion, and a rack portion that meshes with the second pinion at one end, and a rack member that moves to another member at the other end. And a shift plate having an engaging portion for transmitting the gear, the second pinion has a tooth-cut portion in a partial range of a lower portion of the peripheral teeth, and the second pinion has a portion below the second pinion. A differential device characterized in that a rack portion of a shift plate is engaged with each other. 2. The differential device according to claim 1, wherein a predetermined amount of space is provided between a tip tooth and a next tooth of a rack portion of the shift plate that meshes with a lower portion of the second pinion. 3. A fixed position of the shift plate is defined as a position where the first one tooth of the part where the tooth of the second pinion is cut off is adjacent to the tip tooth of the rack portion of the shift plate. The differential device according to claim 2. 4. An operating lever arranged on the other end portion side of the shift plate, wherein the other end portion of the shift plate has a pressing portion for pressing the operating lever, and the pressing portion has an operating lever of the operating lever. A shift hole for projecting a shift pin projecting from one end, and a guide groove projecting a guide pin projecting from another end of the actuating lever, and when the shift plate is in a fixed position, the guide groove The differential device according to any one of claims 1 to 3, wherein rotation of the actuating lever is locked by engagement with the guide pin. 5. A predetermined amount of space is provided between the shift hole and the shift pin, and after the shift plate moves by the space, the shift hole presses the shift pin to rotate the operating lever. The differential device according to claim 4, wherein the differential device is moved. 6. A feed roller that conveys a disc into and out of the apparatus, a disc clamp mechanism that clamps the disc conveyed into the apparatus onto a turntable provided in a suspension chassis, and the suspension chassis when the disc is reproduced. And a suspension lock mechanism for keeping the floating state of the suspension chassis, and the feed roller separates from the disc after the disc is clamped, and then the lock differential mechanism for unlocking the suspension chassis. A disc reproducing apparatus using the differential device according to any one of claims 1 to 5.