JPH0222843Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention is suitably implemented in a disk loading device used to load a disk used as a recording medium such as an audio disk or a video disk for playback or recording. This invention relates to a disk clamping mechanism that can be used to hold a disc.

BACKGROUND ART Conventionally, in such a clamping mechanism, a clamping portion for clamping a disk is provided at one end of a support member bent in a substantially L-shape, and a clamping portion for energizing or demagnetizing an electromagnetic solenoid is provided at the other end. A plunger that retracts or extends is connected thereto. The support member is supported by a guide member, and a protrusion provided on the support member fits into a guide elongated hole extending in the vertical direction formed in the guide member. Corresponding to the retracting or extending movement of the plunger, the protrusion is guided by the guide elongated hole, and the support member performs a horizontal raising and lowering movement, so that the clamping part horizontally clamps the disk on the turntable.

However, in such prior art, since the horizontal distance between one end and the other end of the support member is long, when the support member moves up and down, the horizontal part bends due to the weight of the clamp part. It is difficult to ensure parallelism of the clamp part. Furthermore, since the clamp part cannot move up and down in parallel accurately, the protrusion provided on the support member cannot be smoothly guided along the guide hole of the guide member, and therefore, undesirable There is a risk that a load will be generated and cause a failure. Furthermore, since it uses electromagnetic solenoids, it requires a large space.

Purpose An object of the present invention is to provide a disk clamping mechanism that can perform clamping operations in a small space and reliably clamp the disk parallel to the turntable.

The present invention includes a clamper 49 for pressing the disk and fixing it on the turntable 22, and a first clamper arm 50 having a substantially L-shape, one end of which is pivotally supported by fixing pins 57 and 58 of the clamper 49, respectively.
and the second clamper arm 51, and the L of the first clamper arm 50 and the second clamper arm 51.
Pivot pins 59 and 60 that hold the apex portions of the letters in fixed positions, respectively, and a connecting member that pivotally supports and connects the other ends of the first clamper arm 50 and the second clamper arm 51 by individual pins 64 and 65, respectively. 70, and the two fixing pins 57, 58
and the two pivot pins 59, 60.
The axis connecting the two is parallel to the turntable 22, and the distance l3 between the fixed pins, the distance l1 between the pivot pins, and the distance l2 between the individual pins are equal, and the fixed pin 57 and the pivot pin 59 are the same. The distance l4 between them and the distance l5 between the fixed pin 58 and the pivot pin 60 are equal, and the distance l6 between the pivot pin 59 and the individual pin 64 and the distance between the pivot pin 60 and the individual pin 65 are equal. The distance l7 between the two fixing pins 57 and 58, the two pivot pins 59 and 60, and the two pivot pins 5 are set to be equal.
9, 60 and the two individual pins 64, 65 each form a parallelogram, and the clamper 49
By driving the other end of at least one of the first and second clamper arms 50 and 51 with a movable body 34 having a cam surface 63, the pivot pin 5
9, 60 as the center, the turntable 22
This is a disk clamping mechanism characterized by being raised and lowered in parallel to the disk.

Embodiment FIG. 1 is a perspective view of an embodiment of the present invention. A disk 1 as a recording medium is inserted through an entrance 3 into a body 2 of an audio or video device that reproduces the recorded contents of the disk 1 or records on the disk 1.

2 is a simplified plan view showing the internal structure of the embodiment shown in FIG. 1, FIG. 3 is a front view of FIG. 2, and FIG. 4 is a right side view of FIG. 2. It is. Referring to these drawings, a loading motor 11 for loading the disk 1 is provided on the right side of the disk 1, and a worm 13 is provided on a rotating shaft 12 of the motor 11. Gears 14 and 15 are arranged on the worm 13 so that their rotation axes are perpendicular to the longitudinal direction of the worm 13. The gear 14 has an idler gear 1.
4a can be engaged.

Above the bottom 2a of the body 2 (see FIG. 3), there is a first case 16 for inserting and ejecting a disk, and a second case 17 that supports the first case 16.
are arranged vertically and parallel to each other. The first case 16 is arranged above the second case 17. A disk tray 39 for mounting the disk 1 is housed between the first case 16 and the second case 17. A rack 18 is provided on the lower surface of the right side of the first case 16, and this rack 18 meshes with the gear 14. The rotational driving force from the gear 14 is easy 18
The signal is transmitted to the first case 16 via the first case 16, thereby allowing the first case 16 to be displaced in the vertical direction in FIG. The second case 17 is also provided with a rack 19, which is connected to the gear 1.
It is meshed with 5. The rotational driving force from the gear 15 is transmitted to the second case 17 via the rack 19, so that the second case 17 can also be displaced in the vertical direction in FIG. A roller 20 is disposed in contact with the second case 17,
This allows the first case 16 and the second case 17 to move smoothly.

When the disk 1 is placed on the disk tray 39 and inserted from the entrance 3 of the fuselage 2 to a predetermined position,
The disk 1 is pressed onto the turntable 22 by a clamp mechanism 21, which will be described later, and loading is completed.

FIG. 5 is a simplified plan view showing the clamp mechanism 21 in the fuselage 2 and its related configuration, FIG. 6 is a front view of FIG. 5, and FIG. 7 is a right side view of FIG. 5. It is. A clamp mechanism 21 is arranged above the disk 1. A turntable 22 is provided below the disk 1, and a spindle motor 23 for rotating the turntable 22 is provided below the turntable 22. The rotation shaft of this motor 23 is inserted through the rotation center of the turntable 22 and fixed.

A pickup 24 is also provided above the disk 1 for detecting the signals recorded on the disk 1, and can be moved vertically in FIG. 5 by a pickup feeding motor 25. To explain in more detail, pick up 24
is supported by a bearing holder 24a,
This bearing holder 24a has a support shaft 24b attached to the support shaft 24b.
It is mounted so that it can be displaced along the axial direction of b. A worm 26 is provided on the rotating shaft of the motor 25, and a gear 27 is meshed with the worm 26. A rack 28 is meshed with the gear 27. This rack 28 is fixed to the pick-up 24, and the rotational driving force from the motor 25 is applied to the worm 2.
6, a gear 27, and a rack 28 to the pick-up 24, so that the pick-up 24 can be displaced in the vertical direction in FIG. 5 along the support shaft 24b.

On both sides of the disk tray 39 on which the disk 1 is mounted, lifting levers 40 and 41 are provided as support members that support the disk tray 39 so as to be able to move up and down.
is provided. Arms 31 and 32 are provided close to the upper ends of the lifting levers 40 and 41, and these arms 31 and 32 are connected by a connecting rod 30. The arm 32 is rotatably supported by a pin 87 on a movable body 34 that is vertically movable in FIG. A rack 34a is formed on a portion of the upper surface of the movable body 34.
This rack 34a is meshed with a gear 38. A worm 36 is fixed to the rotating shaft of the clamp motor 35, and the rotational driving force of the motor 35 is transmitted to the movable body 34 via the worm 36, gears 37, 38, and rack 34a. 34
is displaceable in its longitudinal direction. As the slider 34 is displaced, the disk tray 39 and the clamp section 49 can be moved up and down as described later.

8 is a perspective view of the clamp mechanism 21, FIG. 9 is an exploded perspective view of FIG. 8, FIG. 10 is a plan view of FIG. 8, and FIG. 11 is an arrow mark in FIG. It is a side view seen from the B side. Clamp mechanism 21
These include a clamp part 49 for pressing the disk 1 onto the turntable 22, a first clamper arm 50 as a first drive member that supports the clamp part 49 so as to be able to move up and down, and a second clamper arm 51 as a second drive member. and clamper arms 50, 51
A holding member 52 that holds the. 1st
The clamper arm 50 includes a plate-shaped portion 53 that extends in the horizontal direction, and a hanging portion 54 that is connected to the plate-shaped portion 53 and extends downward in the vertical direction. The second clamper arm 51 also includes a plate-like portion 55 and a hanging portion 56. The tip of the plate-shaped portion 53 (left side in FIG. 8) is U
Each part 50 of this U-shape is formed into a letter shape.
A clamp portion 49 is fitted between a and 50b, and is pivotally supported on the plate portion 53 by a fixing pin 57. The second clamper arm 51 also has a similar configuration to the first clamper arm 50, and the clamp portion 49 is pivotally supported by a fixing pin 58.

A clamper arm holding member 52 is provided surrounding the hanging parts 54 and 56. The first clamper arm 50 is pivotally supported on the holding member 52 by a pivot pin 59, and the second clamper arm 51 is supported by a pivot pin 60.
is pivotally supported on the holding member 52 by. Therefore, the first clamper arm 50 can be angularly displaced around the axis of the pivot pin 59, and the second clamper arm 51 can be angularly displaced around the axis of the pivot pin 60.

A torsion spring 60 is attached to the outer periphery of the pivot pin 59, and both ends of the torsion spring 60 are fixed to the holding member 52. Therefore, the second
The clamper arm 51 is spring-biased in the counterclockwise direction indicated by arrow C in FIG. 1st
A second clamper arm 51 is disposed below the clamper arm 50, and a portion of the first clamper arm 50 is inserted into a long hole 61 formed from the plate-shaped portion 53 to the hanging portion 54 of the first clamper arm 50. Insert. Hanging portion 5 of first clamper arm 50
4 and the hanging portion 56 of the second clamper arm 51,
They are rotatably connected by individual pins 64 and 65 via a connecting member.

An extending piece 62 extending horizontally from the hanging portion 54 of the first clamper arm 50 has a cylindrical projection 10.
0 is set up. A moving body 34 is provided in contact with this protrusion 100. As described above, this movable body 34 is movable in its longitudinal direction, and has a rack 34a formed on its upper surface. motor 35
The rotational driving force from the worm 36, gears 37, 3
8, is transmitted to the movable body 34 via the rack 34a, thereby making it possible for the movable body 34 to be displaced.

A cam surface 6 is provided on the side near the tip of the moving body 34.
3 is formed. This cam surface 63 includes a flat plate portion 63a parallel to the moving direction D of the moving body, and a flat plate portion 63a parallel to the moving direction D of the moving body.
3a and an inclined guide portion 63b that is inclined inward (to the left in FIG. 10) from the upstream side to the downstream side in the moving direction D. Since the first clamper arm 50 is spring biased counterclockwise, the protrusion 100
is constantly guided in contact with the cam surface 63. When the movable body 34 having such a configuration is displaced along the longitudinal direction, the protrusion 100 is pressed by the cam surface 63, so that the protrusion 100 is displaced in a direction parallel to the width direction of the movable body 34. . By displacing this protrusion 100, the first
The clamper arm 50 can be angularly displaced around the axis of the pivot pin 59. The first and second clamper arms 50, 51 are approximately L-shaped.
The apex portions of the letters are held at fixed positions by pivot pins 59 and 60, respectively. The connecting member 70 is the first
The ends of the second clamper arms 50 and 51 are pivotally supported and connected by individual pins 64 and 65. Axis line connecting fixed pins 57 and 58 and pivot pin 5
The axis connecting 9 and 60 is parallel to the turntable 22.

Next, the operating state of the clamper mechanism 21 will be explained. When the disc 1 is placed on the turntable 22, the motor 35 is started and the motor 35
as a driving source, a worm 36, gears 37, 38
The moving body 34 moves along the moving direction D via the moving body 34 . Therefore, the first clamper arm 50 is rotated clockwise around the axis of the pivot pin 59 by the cam surface 63. At this time, the clamp part 49 is attached to one end of the clamper arms 50, 51, and the clamper arms 50, 51 are attached to the connecting member 7.
0 through individual pins 64 and 65, and the pins 59 and 60 are connected by reference numerals l1,
Reference mark l2 between pins 64 and 65, pins 57 and 58
Reference mark l3 between pins 59 and 57, reference mark l between pins 59 and 57
4. Between pins 60 and 58, refer to l5, pin 59,
If the space between pins 64 and 64 is designated by reference numeral 16, and the space between pins 60 and 65 is designated by reference 17, the following first equation holds true.

l1=l2=l3 l4=l5 l6=l7...(1) That is, the fixed pins 57, 58 and the pivot pin 59,
60 is a parallelogram, and the pivot pins 59, 60 and the individual pins 64,
The quadrilateral formed by 65 and 65 is a parallelogram. Therefore, when the connecting member 70 is displaced in the horizontal direction, the clamp 49 supported by the fixing pins 57 and 58 descends parallel to the turntable 22, as shown by the imaginary line n1 in FIG. do.

FIG. 12 is a sectional view of the clamp portion 49. The clamp part 49 includes a clamper 75 for fixing the disk 1 mounted on the turntable 22.
The clamper case 76 includes a clamper case 76 that rotatably holds the clamper 75, and a clamper case cover 77 that covers an upper opening 76a of the clamper case 76. The clamper 75 is made of a permanent magnet and includes a right cylindrical portion 75a and a flange portion 75b extending horizontally from the top of the right cylindrical portion 75a. A fitting hole 75c is formed concentrically in the right cylindrical portion 75a, and the turntable 2
A protrusion 78 provided at the center of rotation on 2 and protruding upward can be fitted into this fitting hole 75c.

The clamper 75 is rotatable around the axis because the flange portion 75b is housed in the space formed by the clamper case 76 and the clamper case cover 77. Therefore, when the turntable 22 rotates after the clamper 75 fixes the disk 1 on the turntable 22, the disk 1 can also rotate in accordance with the rotation of the turntable 22.

A protrusion 79 is provided on the upper surface of the clamper 75 and protrudes upward along the rotation axis. A pressing portion 77a is provided on the lower surface of the clamper case cover 77 in correspondence with the protrusion 79. The turntable 22 arranged below the clamper 75 is made of ferromagnetic material. The rotation axis of the motor 23 is common to the axis of the turntable 22, and is fixed by being inserted through the turntable 22 and the protrusion 78.

When disk 1 is loaded into the turntable,
As described above, the clamp portion 49 is lowered horizontally by the clamp arms 50 and 51. At this time, the clamp arm 51 is lowered by the spring force of the spring 60, and this spring force is applied to the clamper case cover 7.
The clamper 7 is
6. Due to this spring force and the magnetic attraction force between the clamper 75 and the turntable 22,
Disc 1 is clamped.

In this way, since the clamping force for clamping the disk 1 onto the turntable 22 is made to use both the spring force and the magnetic attraction force, the motor 23
The load on the clamper 75 is reduced, and positioning of the clamper 75 in the clamped state is facilitated.

In this embodiment, the clamper 75 is a permanent magnet,
Further, although the turntable 22 is made of a ferromagnetic material, in other embodiments, both the clamper 75 and the turntable 22 may be made of a permanent magnet, or the clamper 75 may be made of a ferromagnetic material and the turntable 22 may be made of a permanent magnet. Alternatively, for example, a permanent magnet may be housed in the clamper 75. That is, a magnetic attraction means may be provided in association with the clamper 75 and the turntable 22 so that a magnetic attraction force is generated between the clamper 75 and the turntable 22.

FIG. 13 is a perspective view showing the disk tray 39 and its related configuration, and FIG.
FIG. 3 is an exploded perspective view of FIG. 3; A disk lifting lever 40 is provided on one side of the disk tray 39 (right side in FIG. 13) so as to be movable in its longitudinal direction. Approximately S-shaped guide holes 80 and 81 are formed at both ends of the disk lifting/lowering lever 40. As shown in FIG.
Bracket portions 82 and 83 are provided upright on the peripheral edge of the disk tray 39 in correspondence with the guide holes 80 and 81, and the bracket portions 82 and 83 are provided at right angles to the bracket portions 82 and 83 and on the outside. Guide pins 84 and 85 are provided that protrude in the direction. These guide pins 84 and 85 are connected to the guide holes 80 and 81.
is inserted. The structure related to such a lifting lever 40 is similar to that of another disk lifting lever 41 disposed on the other side of the disk tray 39.
The same applies to In the lifting lever 41, a portion corresponding to the lifting lever 40 is given a subscript a.

The arms 31 and 32, which are disposed close to the upper end (the right side in FIG. 13) of the lifting levers 40 and 41, have a push rod 86 for pushing the levers 40 and 41; 87 is provided. Arm 31
is rotatably connected to the movable body 34 by a pin 88. The rotational movement of arm 31 is transmitted to arm 32 via guide rod 30, so that arm 32
is also rotated in the same direction as the arm 31. Note that the lifting levers 40 and 41 are biased in the same direction as the moving direction D by springs 89 and 90.

Next, the raising and lowering operation of the disk tray 39 will be explained. When the motor 35 is driven as described above, the moving body 34 moves in the direction of arrow D (see FIG. 13).
As a result, the arms 31 and 32 are rotated in the direction of arrow E. Therefore, the pressure rods 86, 8
7 presses the lifting levers 40, 41, and the levers 40, 41 are moved as shown by the virtual line n2 in FIG.
move. Corresponding to the movement of the levers 40, 41, the guide pins 84, 85; 84a, 85a are guided by the guide holes 80, 81; 80a, 81a and are displaced downward, whereby the disk tray 39 is lowered. do. The raising operation of the disk tray 39 is performed by the reverse operation of the lowering operation. That is, the moving body 34 moves in the direction opposite to the arrow D, and therefore the arms 31 and 32 rotate in the direction opposite to the arrow E. With this, the lifting lever 4
0 and 41 are allowed to move in the direction of the arrow D, and the lifting levers 40 and 41 are biased in the direction of the arrow D by the springs 89 and 90, so the lifting levers 40 and 41 move in the direction of the arrow D. It is displaced in the direction of mark D. By this, guide pins 84, 85; 84a, 85
a is guided by the guide holes 80, 81; 80a, 81a and displaced upward, and the disk tray 39 rises.

In this way, move disk 1 up and down,
This can be done reliably without adversely affecting the disk, and the structure can be simplified.

Effects As described above, according to the present invention, the clamper can reliably descend while remaining horizontal. Furthermore, since an electromagnetic solenoid is not used unlike the prior art, the clamping operation can be performed in a small space. The fixed pins 57, 5 are smaller than the distances l6, l7 between the pivot pins 59, 60 and the individual pins 64, 65.
Distance l4, l5 between 8 and the pivot pins 59, 60
If is made sufficiently long, a large amount of movement (vertical movement) of the clamper can be obtained by only slightly driving (horizontal movement) the other ends (connection member 70) of the first and second clamper arms 50, 51. Therefore, the drive unit may be small-scale, and the space can be reduced. Furthermore, since the vertical movement of the clamper is controlled by driving the other ends of the first and second clamper arms 50 and 51 in the horizontal direction, the clamper can be raised and lowered by horizontal movement of the movable body 34 having a cam surface. The operation can be controlled, and the clamper can be moved up and down with a simple configuration and a small driving force.
Furthermore, since the respective fulcrums of the first and second clamper arms and the connecting member do not move in response to the vertical movement of the clamper, the clamper can be moved completely parallel to the turntable.

[Brief explanation of drawings]

1 is a perspective view of one embodiment of the present invention, FIG. 2 is a plan view showing a simplified internal structure of the embodiment shown in FIG. 1, FIG. 3 is a front view of FIG. 2, and FIG. The figure is a right side view of Fig. 2, Fig. 5 is a plan view showing a simplified view of the clamp mechanism 21 and its related configuration, Fig. 6 is a front view of Fig. 5, and Fig. 7 is a right side view of Fig. 5. A top view, FIG. 8 is a perspective view of the clamp mechanism 21,
9 is an exploded perspective view of the clamp mechanism 21 shown in FIG. 8, FIG. 10 is a plan view of FIG. 8, FIG. 11 is a side view of the clamp mechanism 21 shown in FIG. 10, and FIG. 12 is a side view of the clamp mechanism 21 shown in FIG. 13 is a sectional view of the clamp portion 49, FIG. 13 is a perspective view showing the disk tray 39 and related components, and FIG. 14 is an exploded perspective view of FIG. 13. 1... Disc, 21... Clamp mechanism, 22
...Turntable, 34...Moving object, 50...
First driving member, 51...Second driving member, 57,5
8... Fixed pin, 59, 60... Pivotal support pin, 6
4, 65...Individual pin, 70...Connecting member.

Claims (1)

[Scope of utility model registration request] A clamper 49 for pressing and fixing the disk onto the turntable 22; a first and second roughly L-shaped clamper arm 50 whose one end is pivotally supported by fixing pins 57 and 58 of the clamper 49, respectively;
a clamper arm 51 and the first clamper arm 5
Pivot pins 59 and 60 that hold the L-shaped apex portions of the zero and second clamper arms 51 at fixed positions, respectively.
The other ends of the first clamper arm 50 and second clamper arm 51 are connected to individual pins 64,
65, and an axis connecting the two fixing pins 57, 58 and an axis connecting the two pivot pins 59, 60 are parallel to the turntable 22. ,
And distance l3 between fixed pins, distance l between pivot pins
1 and the distance l2 between the individual pins are equal, and the distance l4 between the fixed pin 57 and the pivot pin 59 and the distance l5 between the fixed pin 58 and the pivot pin 60 are the same.
are set equal, and furthermore, the distance l6 between the pivot pin 59 and the individual pin 64 and the distance l7 between the pivot pin 60 and the individual pin 65 are set equal, and the distance l6 between the pivot pin 59 and the individual pin 64 is set equal, and
the two fixing pins 57 and 58 and the two pivot pins 5
9, 60, the two pivot pins 59, 60, and the two individual pins 64, 65 each form a parallelogram, and the clamper 49 has at least one of the first and second clamper arms 50, 51. A disk characterized in that it is raised and lowered in parallel to the turntable 22 about the pivot pins 59 and 60 by driving the other end with a moving body 34 having a cam surface 63. Clamp mechanism.