Abstract:
A disk receiving and transferring device by which a disk is precisely guided into the disk drive. Disks of different diameter can be inserted into a single disk drive, and at the same time gears are smoothly engaged during power transmission for the clamping of a disk. The disk receiving and transferring device of the invention includes: a disk transferor for transferring a disk by the power of a driving source; a balance guide unit for guiding the disk inserted into the device by the transferor for thereby precisely inserting the disk; a holder guide unit which interlocks with the balance guide unit and is guided by the balance guide unit for thereby receiving the disk moved by the transferor and guiding the disk until the disk transfer is finished; and a sensor guide unit for interlocking with the holder guide unit, guiding the disk by the insertion power of the disk, and connecting the power for clamping the disk, wherein the balance guide unit and holder guide unit are configured to be fastened when the power of the driving source is connected.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a disk receiving and transferring device for a disk drive, and more particularly, to a disk receiving and transferring device by which the movement of a disk is precisely guided to the disk drive, disks of different diameter can be used in a single disk drive; and at the same time gears are smoothly engaged during power transmission for the clamping of a disk. 
     2. Description of the Background Art 
     FIG. 1 is a plane view illustrating the construction of a disk transferring device for a roller-type disk drive in the conventional art, and FIG. 2 is a side sectional view illustrating the construction of a disk transferring device for a rollertype disk drive in the conventional art. 
     As illustrated therein, the disk drive is externally constructed of a frame  1 , said frame  1  having elements for driving a disk D. A front plate  2  is installed at the front of the frame  1 , and a slot  2   a  which the disk D is inserted into or extracted from is formed at the front plate  2 . A loading motor (not shown) for loading or unloading the disk D is installed at one inner side of the frame  1 , and a roller  3  rotated by a driving force of the loading motor (not shown) is horizontally installed inside the frame  1 . 
     Here, the roller  3  is made of a material being elastic and exhibiting a predetermined extent of friction force, such as rubber. The roller  3  is supported by a roller bracket  4 , and one end of the roller bracket  4  is connected to a spring  4   c . Thus, the roller  3  pivots on a hinge  4   a  in a clockwise direction, and accordingly it is likely to be firmly in contact with a lower recording surface of the disk D by the roller bracket  4 . 
     A timing plate  5  operated by the disk D when the disk D is inserted a certain amount is installed on a connecting plate  6 , and a driving plate  7  is installed on the frame  1  at a lower side of the timing plate  5 . A rack gear portion  7   a  is formed at one side of the driving plate  7 , and the rack gear portion  7   a , engaged with a loading gear G installed on the frame  1 , drives the driving plate  7 . A guide sloping portion  7   b  is formed at a front end portion of the driving plate  7 , that is, at the driving plate  7  on a lower side of the roller bracket  4 , and an interlocking extrusion portion  7   c  for interlocking with the timing plate  5  is formed at a rear end portion thereof. An interlocking pin  4   b  provided at the roller bracket  4  is in contact with the guide sloping portion  7   b . A guide flap  8  curved in a vertical upward direction for thereby forming a lifting guide slot  8   a  is provided at a rear end portion of the driving plate  7 . 
     A spindle motor  9  for rotating the disk D is installed at the center of the inside of the frame  1 , and a turn table  10  on which the disk D is mounted is installed at the rotating shaft of the spindle motor  9 . 
     In addition, a clamp plate  11  is installed inside the frame  1  so that its free end portion can be lifted at a predetermined angle from a hinge pin  11   a , and a lifting guide boss  11   b  is formed at one side of the clamp plate  11  to be guided along the lifting guide slot  8   a  of the guide flap  8  driven together with the driving plate  7 , thus achieving the lifting of the clamp plate  11 . At the free end portion of the clamp plate  11 , a clamp  12  for holding the disk D mounted on the turntable  10  is installed. 
     In the drawings, reference letter S denotes a sensor for sensing the insertion and extraction of the disk D, which is installed at a front end portion of the frame  1 . 
     The operation of the disk transferring device in accordance with the present invention thusly constructed will now be described. 
     In order to load the disk D, when a user inserts the disk D via the slot  2   a  of the front plate  2 , the sensor S senses the insertion of the disk D to thereby drive the loading motor (not shown). When the loading motor (not shown) is driven, the roller  3  is rotated. The roller  3  is firmly in contact with the lower recording surface of the disk D by elastic force of the spring  4   c  acting upon the disk D of the roller  3  for thereby moving the disk D into the disk drive. When the disk D is inserted so that it is located in an upward direction of the turntable  10 , the timing plate  5  is moved in an arrow direction A of FIG.  1 . 
     When the timing plate  5  is moved a certain amount, the rack gear portion  7   a  of the driving plate  7  engages with the loading gear G for thereby moving the driving plate  7  by the driving force of the loading motor (not shown). With the movement of the driving plate  7 , the interlocking pin  4   b  of the roller bracket  4  in contact with the sloping portion  7   b  of the driving plate  7  is guided along the sloping portion  7   b , and the roller bracket  4  pivots on the hinge pin  4   a  in a counterclockwise direction, whereby the roller bracket  4  is separated from the lower surface of the disk D and the disk D is mounted on the turn table  10 . 
     With the movement of the driving plate  7 , the guide boss  11   b  of the clamp plate  11  located at the lifting guide slot  8   a  of the guide flap  8  is guided along the lifting guide slot  8   a , and the clamp plate  11  is lowered by pivoting on the hinge pin  11   a  in the clockwise direction. As the clamp plate  11  is lowered, a clamp  12  provided on the clamp plate  11  clamps the disk D mounted on the turn table  1 , and the operation of reproducing or recording a signal of the disk D may begin. 
     Meanwhile, the unloading operation of the disk D is achieved in a reverse manner to the above loading operation. 
     However, the above-described conventional art has the following problems. One problem is that, when the disk D is moved by the roller  3 , the disk D is not precisely moved to the desired position because the roller  3  cannot precisely guide the disk D. This is because, although many constructions for guiding the disk D during the movement of the disk D have been disclosed, those constructions cannot guide the disk D to its home position (a position at which the center of the disk D corresponds to the center of the turn table  7   t ) while not acting as a load on the movement of the disk D. 
     That is, if the construction for guiding the disk D during the movement of the disk D acts as a load, the roller  3  is largely loaded. Thus, there arise problems that the roller  3  is abraded, its life span is shortened, and the signal recording surface of the disk D is stained with debris generated due to the abrasion of the roller causing errors when reading or reproducing a recorded signal from the disk D. In addition, there is another problem that, if the roller  3  is abraded, the transfer of the disk D is not precisely achieved. 
     In the above-described conventional construction, the overall size of the device is so large that it goes against the tendency of lightening, thinning, shortening, and miniaturizing the disk driver. Thus, there is still another problem that a disk of a certain size, for example, only one of a 12 cm disk and an 8 cm disk has to be used. 
     Regarding the loading gear G and the rack gear portion  7   a  of the driving plate  7 , as illustrated in FIG. 1, each gear tooth is angularly formed such that the gearing therebetween is not smooth, as the angled gear teeth cause undesirable collisions. If these collisions continuously occur, the gear teeth are abraded and thus they are not appropriately engaged. To avoid this collision, there have been disclosed a construction in which the gear teeth are always engaged. However, in this construction, there is a problem because power is supplied to the structure for clamping even when clamping is not achieved, thus resulting in unnecessary power consumption. 
     SUMMARY OF THE INVENTION 
     The present invention provides a disk receiving and transferring device for a disk drive which is capable of precisely guiding a disk during the movement of the disk. The disk receiving and transferring device for a disk drive is lightened, thinned, shortened, and miniaturized. The disk receiving and transferring device for a disk drive which makes it possible to use disks of different diameter in a single disk drive. The disk receiving and transferring device for a disk drive allows the engagement between gears to be smoothly achieved during power transmission for the clamping of a disk. 
     The disk receiving and transferring device for the disk drive in the present invention includes: a disk transferring means for transferring a disk by the power of a driving source; a balance guide unit for guiding the disk inserted into the device by the transferring means for thereby precisely inserting the disk; a holder guide unit which interlocks with the balance guide unit and is guided by the balance guide unit for thereby receiving the disk moved by the transferring means and guiding the disk until the disk transfer is finished; and a sensor guide unit for interlocking with the holder guide unit, guiding the disk by the insertion power of the disk, and connecting the power for clamping the disk. 
     The balance guide unit and holder guide unit are configured to be fastened as soon as the power of the driving source is connected. 
     Additional advantages, objects and features of the invention will become more apparent from the description which follows. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The present invention will become better understood with reference to the accompanying drawings which are given only by way of illustration and thus are not limitative of the present invention, wherein: 
     FIG. 1 is a plane view illustrating the construction of a disk transferring device for a disk drive in accordance with the conventional art; 
     FIG. 2 is a side sectional view illustrating the construction of a disk transferring device for a disk drive in accordance with the conventional art; 
     FIG. 3 is a plane view illustrating the construction of a disk drive in accordance with the present invention; 
     FIG. 4 is a side sectional view illustrating the construction of a disk drive in accordance with the present invention; 
     FIG. 5 is a plane view illustrating the construction of a lever for guiding a disk in a disk drive in accordance with the present invention; 
     FIG. 6 a  is a plane view illustrating the path through which power is transmitted in a disk drive in accordance with the present invention; 
     FIG. 6 b  is a side sectional view illustrating the path through which power is transmitted in a disk drive in accordance with the present invention; 
     FIG. 7 is a plane view illustrating another example of a lever connecting structure which comprises a disk drive in accordance with the present invention; 
     FIG. 8 is a plane view illustrating yet another example of a lever connecting structure which comprises a disk drive in accordance with the present invention; 
     FIGS. 9 through 14 are operational views sequentially illustrating the transfer of a 12 cm disk in a disk drive in accordance with the present invention; 
     FIG. 15 through 18 are operational views sequentially illustrating the transfer of an 8 cm disk in a disk drive in accordance with the present invention; 
     FIG. 19 is a side view illustrating the construction of the essential portion of a disk drive in accordance with the present invention; 
     FIG. 20 is a plane view illustrating the construction of a clamping driving plate of a disk drive in accordance with the present invention; and 
     FIG. 21 is a schematic view illustrating the construction of an elastic supporting arm of a disk drive in accordance with the present invention. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     A preferred embodiment of the present invention is now described with reference to the attached drawings. 
     As illustrated in FIGS. 3 and 4, each element is installed between a main chassis  10  and an upper chassis  20 . 
     Firstly, a pickup unit (not shown) required for the recording and reproducing onto a disk D is installed at the main chassis  10 . The construction of the pickup unit is not the focus of the essentials of the present invention, so the detail description thereof is omitted. 
     In addition, a turntable (not shown) on which the disk D is rotated is installed at the main chassis  10 . In general, the turntable is rotated by a spindle motor (not shown). 
     The parts for the movement and clamping of the disk D are installed at the upper chassis  20  as illustrated in FIG.  3 . In detail, a driving motor  30  for providing power for the transfer and clamping of the disk D is installed at one side of the upper chassis  20 . 
     As illustrated in FIGS. 6 a  and  6   b , the driving power of the driving motor  30  is transmitted to a slave pulley  35  via a belt  33  wrapped around a driving pulley  32  installed at the rotating shaft  31  of the driving motor  30 . With the slave pulley  35 , a driving worm  36  is coaxially installed. The driving worm  36  simultaneously transmits power to a disk transfer path and a disk clamping path. That is, a loading worm wheel  40  at the upper side of the driving worm  36  and a clamping worm wheel  70  at one side thereof are engaged with each other. 
     The loading worm wheel  40  engages with the driving worm  36 , being connected to a connecting shaft  41 . At the end portion of the opposite side of the connecting shaft  41 , a slave worm wheel  43  is installed. The slave worm wheel  43  is engaged with a first loading gear  44 , said first loading gear  44  being engaged with a second loading gear  45 . The second loading gear  45  is engaged with a roller gear  52 . 
     As illustrated in FIG. 4, the roller gear  52  is installed to be coaxial with a roller shaft  51  to be described below for thereby rotating the roller shaft  51 . Meanwhile, a roller bracket  50  is installed at a lower surface of the front end portion of the upper chassis  100 , as illustrated in FIGS. 3 and 4. The roller bracket  50  is installed to pivot on a hinge point  50   h  at both ends thereof, and is elastically supported by a spring so that a roller  53  to be described below is biased toward the bottom side of the upper chassis  20 . 
     At the roller bracket  50 , a roller shaft  51  is installed in a horizontal direction, to which a roller  53  is connected. The roller  53 , which is generally made of rubber, is in contact with a lower surface of the disk D and transfers the disk D by its friction force. 
     Hereinafter, the construction for guiding the transfer of the disk D will now be described. As illustrated in FIGS. 3 through 5, first and second balance rods  61  and  63  and first and second holder rods  66  and  68  for guiding the sides of the disk D during the insertion of the disk D are operatively connected with the upper chassis  20 . 
     The first and second balance rods  61  and  63  are respectively formed on the first and second balance levers  60  and  62  in a downward direction extending away from the upper chassis  20 . The first and second balance rods  61  and  63  are guided along guide surfaces  21  and  21 ′ formed at the front end of the upper chassis  20  as illustrated in FIG.  3 . The first and second balance levers  60  and  62  are installed at the top surface of the upper chassis  20  so that they pivot around hinges  60   h  and  62   h  respectively connected thereto. And, interlocking holes  60   a  and  62   a  exist respectively at the first and second balance levers  60  and  62 . The interlocking holes  60   a  and  62   a  are used to control the operation of the first and second holder levers  65  and  67  to be described below. 
     The first and second holder rods  66  and  68  are connected to the first and second holder levers  65  and  67  installed to be pivotable around hinges  65   h  and  67   h  connected to the top surface of the upper chassis  20 . Namely, the first and second holder rods  66  and  68  are connected to the front end of the first and second holder levers  65  and  67 , and thereby protrusively installed at the lower portion of the upper chassis  20  via guide slots  23   a  and  23   a ′ formed at both sides of the upper chassis  20  as illustrated in FIG.  3 . 
     At the above-described first and second holder levers  65  and  67 , interlocking bosses  65   t  and  67   t  located at the interlocking holes  60   a  and  62   a  are installed, and interference avoiding slots  65   r  and  67   r  which drives the first and second holder levers  65  and  67  so that the first and second holder rods  66  and  68  deviate from the sides of the disk D at the end of the loading operation of the disk D are provided. Here, the interlocking holes  60   a  and  62   a  allow the first and second holder levers  65  and  67  to be operatively connected to the first and second balance levers  60  and  62  so that they are fastened to each other without floating. 
     Meanwhile, first and second connecting levers  69  and  69 ′ are connected with the first and second balance levers  60  and  62 , and the first and second connecting levers  69  and  69 ′ are connected with each other by a connecting pin  69   p . The connecting pin  69   p  is guided along a slot  24  formed at the upper chassis  20 . Here, as illustrated in FIG. 5, a partial insertion preventing unit  24   p  is formed at one end portion of the slot  24  (the position at which the connecting pin  69   p  is located with the disk D not being inserted). 
     If the disk D is not precisely inserted into the center of the drive, the balance of power applied to the balance rods  61  and  63  of the balance levers  60  and  62  by the disk D is not maintained. In this case, the partial insertion preventing unit  24   p  is used to prevent the operation of the balance levers  60  and  62  by fastening the connecting pin  69   p.    
     Meanwhile, the first and second connecting levers  69  and  69 ′ are also connected to the first and second holder levers  65  and  67  by restoring springs  65   s  and  67   s , respectively. 
     Resultantly, the first and second balance levers  60  and  62 , first and second holder levers  65  and  67 , and first and second connecting levers  69  and  69 ′ are connectingly interlocked with each other. The restoring springs  65   s  and  67   s  are used to restore the levers to their original positions when the disk D is removed. 
     Another example of the balance levers  60  and  62  and holder levers  65  and  67  at which the above-described interlocking holes  60   a  and  62   a  are formed is illustrated in FIG.  7 . The interlocking holes  60   a  and  62   a  of FIG. 7 is formed in a boomerang shape. FIG. 8 illustrates yet another example of the interlocking holes  60   a  and  62   a , which are constructed to be far more rectangular than those of FIG.  6 . The construction for transmitting power for clamping the disk D on the turntable will now be described with reference to FIGS. 3,  6   a  and  6   b.    
     As illustrated in FIG. 6 a , the clamping worm wheel  70  is provided with a gear row  72  for transmitting power, being engaged with the same. A driving gear  73  located at the end portion of the gear row  72  is installed to be selectively engaged with a rack gear portion  75 r of a driving plate  75  installed on the upper chassis  20 . 
     As illustrated in FIG. 3, the driving plate  75  includes two moving slots  75   s , and is configured to move forwardly and backwardly along the moving slots  75   s  by guide pins  20   p  installed at the upper chassis  20  and inserted into the moving slots  75   s.    
     First and second guide slots  76  and  77  for guiding a sensor lever  80  to be described below are formed at the driving plate  75  according to the type of the disk D. The first guide slot  76  guides the sensor lever  80  in case of 12 cm disk D, and the second guide slot  77  guides the sensor lever  80  in case of 8 cm disk D. 
     In detail, the sensor lever  80  is installed at the top surface of the upper chassis  20  to be pivotable on a hinge  80   h  at one end portion of a connecting lever  85  to be described below. As illustrated in FIG. 5, the sensor lever  80  is used to transmit power for clamping the disk D by moving the driving plate  75  to thus engage the rack gear portion  75   r  of the driving plate  75  with the driving gear  73 , as a sensor rod  83  installed at one end of the sensor lever  80  to be described below is pushed by the disk D inserted into the disk drive by the roller  53 . 
     When the driving plate  75  is driven by the sensor lever  80  for thereby engaging the rack gear portion  75   r  with the driving gear  73 , one of the gear teeth of the rack gear portion  75   r  that is initially engaged with the driving gear  73  has a rounded shape. 
     As illustrated in FIG. 5, since a guide boss  81  is connected to one end portion of the sensor lever  80 , the sensor lever  80  can be selectively located at the first and second guide slots  76  and  77  of the driving-plate  75  illustrated in FIG. 3 according to the type of the disk D. A sensor rod  83  pushed by the movement of the disk D, is connected at the other end portion of the sensor lever  80  in connection with the sides of the front end of the disk D inserted into the drive. 
     The sensor rod  83  is located and travels within a sensor rod slot  26  E formed at the upper chassis  20  and extends in a downward direction from the upper chassis  20 . 
     Meanwhile, the sensor lever  80  is connected with the second holder lever  67  by the connecting lever  85  as illustrated in FIG.  5 . That is, the connecting lever  85  and the sensor lever  80  are connected with each other by the hinge  80   h , and at the same time they are connected by the restoring spring  85   s . And, since a moving slot  85   t  receiving the guide pin  20   p  fixed on the upper chassis  20  is formed at the connecting lever  85 , the connecting lever  85  becomes movable along the top surface of the upper chassis  20  as far as the length of the moving slot  85   t.    
     In the above-described device of the invention, the movement of the components for receiving a 12 cm disk will be described with reference to FIGS. 9 through 14. As illustrated in FIG. 9, the user inserts the disk D into the disk drive, the disk D simultaneously touches the first and second balance rods  61  and  63 . In the case that the disk D is not inserted into the front center of the disk drive, but is partially inserted in an off-center manner into the disk drive, since the connecting pin  69   p  is caught in the partial insertion prevention unit  24   p  of the vertical slot  24 , the first and second balance rods  61  and  63  are not moved. When the disk D is properly inserted, the first and second balance rods  61  and  63  are moved along the guide surfaces  21  and  21 ′, as illustrated in FIG.  10 . 
     As the disk D is continuously inserted, the disk D contacts the roller  53  and, as the disk D is sensed by a sensor (not shown), the driving motor  30  is operated. By the operation of the driving motor  30 , its driving power is transmitted to the loading worm wheel  40  illustrated in FIG. 6 a . Then, as the roller gear  52  is rotated by the loading worm wheel  40 , the roller shaft  51  illustrated in FIG. 3 is rotated and thereby the roller  53  begins to move the disk D. As the disk D is moved by the roller  53 , the first and second balance rods  61  and  63  are further pushed apart, each being in contact with the sides of the disk D. 
     When half of the disk D is inserted into the disk drive, the first and second balance rods  61  and  63  are at their maximum expanded positions as shown in FIG.  12 . As the disk D is continuously inserted, the first and second holder rods  66  and  68  then move to their maximum expanded positions in the guide slots  23  as illustrated in FIG.  11 . The first and second holder levers  66  and  68  move due to the first and second balance levers  60  and  62  as illustrated in FIG. 12, for thereby accurately guiding the disk D into the disk drive as illustrated in FIG.  13 . Here, the sensor rod  83  of the sensor lever  80  connected to the second holder lever  67  by the connecting lever  85  is also moved along the sensor rod slot  26 , and the guide boss  81  is located at the first guide slot  76  when receiving a 12 cm disk D. 
     If the disk D is continuously inserted into the disk drive, the front end of disk D pushes the sensor rod  83  of the sensor lever  80 . With the sensor lever  80  being pushed, the guide boss  81  of the sensor lever  80  moves the driving plate  75  in a direction towards the front plate  2  as illustrated in FIG.  14 . In this way, when the driving plate  75  is moved, the rack gear  75   r  of the driving plate  75  and the driving gear  73  are engaged with each other, and thereby the power of the driving motor is transmitted to the driving plate  75 . 
     As described above, in the case that the sensor lever  80  moves the driving plate  75 , the roller  53  for transferring the disk D hardly receives any load because the balance levers  60  and  62  and the holder levers  65  and  67  are not moved. 
     To achieve this in the present invention, interlocking holes  60   a  and  62   a  are formed on the balance levers  60  and  62 , and interlocking bosses  65   t  and  67   t  are formed at on the holder levers  65  and  67 . 
     The movement of driving plate  75  causes the elements for clamping the disk to operate. In detail, the driving plate  75  is moved in a direction towards the front plate  2 , and a first lifting plate  90  shown in FIG. 8 is moved in the same direction as the driving plate  75 . The first lifting plate  90  moved by the driving plate  75  is installed to cover parts of the top surface and sides of the upper chassis  20 . The first lifting plate  90  is operated in connection with the driving plate  75 , being installed at one side of the upper chassis  20 . 
     As described above, when the first lifting plate  90  is moved, the clamping driving plate  100  is rotated via an interlocking pin  102  located at a driving hole  91  formed on the first lifting plate  90 , for thereby clamping the disk D as shown in FIG.  3 . 
     Meanwhile, the case of inserting a disk D having a diameter less than 12 cm, for example an 8 cm disk, is illustrated in FIGS. 15 through 18. In this case, both sides of the disk D are guided by the first and second balance rods  61  and  63  as illustrated in FIG. 16, only if more than half of the disk D is inserted into the drive, because the size of the disk D is small. 
     As the disk is moved by the roller  53 , the first and second holder rods  66  and  68  guide the disk D and are separated from the sides of the disk D by the engagement between cam portions  104  and  104 ′ of the clamping driving plate  100  shown in FIG. 20, and the interference avoiding bosses  65   r  and  67   r  of the holder levers  65  and  67 . If a disk D having a diameter less than 12 cm, for example an 8 cm disk, is inserted, the cam portions  104  and  104 ′ formed on the clamping driving plate  100  as shown in FIG. 20, separate the first and second holder rods  66  and  68  from the sides of the disk D as the interference avoiding bosses  65   r  and  67   r  are engaged. First and second interlocking arms  101  and  101 ′ are formed on opposing sides of the clamping driving plate  100  which is attached to an upper portion of the upper chassis  20 , and interlocking pins  102  and  102 ′ are provided at the end portion of the interlocking arms  101  and  101 ′, respectively. 
     The first interlocking arm  101  receives driving power from the first lifting plate  90  with the interlocking pin  102  located at the driving hole  91 . In addition, a driving guide slot  103  having a certain curvature is formed on the clamping driving plate  100 , and the guide pin  20 p installed on the upper chassis  20  is inserted into the driving guide slot  103 . In this manner, the rotating movement of the clamping driving plate  100  is achieved by the driving guide slot  103  and the guide pin  20   p.    
     Meanwhile, as illustrated in FIGS. 3 and 21, an elastic supporting arm  105  is installed on the clamping driving plate  100 . One end portion of the elastic supporting arm  105  is connected to the clamping driving plate  100 , a supporting plate  106  for supporting a clamping ring  110  is provided at the free end portion thereof, and a guide flap  107  for lifting the supporting plate  106  and the clamping ring  110  thereon, is formed at one side of the free end portion. The guide flap  107  varies the vertical position of the supporting plate  106  as it is moved by the rotation of the clamping driving plate  100  according to a sloping side  28  formed at the upper chassis  20 . An interlocking curved portion  108  exists, between the end of the elastic supporting arm  105  connected to the clamping driving plate  100  and the supporting plate  106 . As illustrated in FIG. 3, a damper  120  is installed so that it is put on the supporting plate  106  of each elastic supporting arm  105 . The clamper  120  is located on the turn table on which the disk D is mounted and cooperatively operates with the clamping ring  110  so that the disk D is not randomly removed from the turn table during rotation. 
     Meanwhile, the second interlocking arm  101 ′ of the clamping driving plate  100  extends opposingly from the first interlocking arm  101 , and is connected with a second lifting plate  130  for controlling the lifting operation of the roller  53  and the operation of various guide rods. 
     The function of the second lifting plate  130  is similar to that of the first lifting plate  90 , so the detailed description thereof will be omitted. The first lifting plate  90  and second lifting plate  130  have the same functions, which are installed at both sides of the upper chassis  20  to thus distribute the power of a spring  50   s  supporting the roller bracket  50  as shown in FIG.  19 . 
     Meanwhile, the guide boss  81  of the sensor lever  80  is placed in the second guide slot  77  to thus be guided therein. 
     Hereinafter, vertical guide rods  141  and  141 ′ for supporting both ends of the disk D when the center portion of the disk D has been entered into the turn table will be described. First, as illustrated in FIG. 3, vertical guide levers  140  and  140 ′ are installed at both ends of the top surface of the upper chassis  20 . At the vertical guide levers  140  and  140 ′, vertical guide rods  141  and  141 ′ are connected and extend to the bottom surface of the upper chassis  20  through the upper chassis  20 . 
     In addition, the upper chassis  20  has a through hole (not shown) formed at the corresponding positions in order to allow the vertical guide rods  141  and  141 ′ to move. To drive the vertical guide levers  140  and  140 ′, interlocking bosses  142  and  142 ′ are inserted into interference avoiding grooves  97  and  137  formed at the first and second lifting plates  90  and  130  as shown in FIG.  3 . 
     One end portion of the interference avoiding grooves  97  and  137  is formed to be bent so that the vertical guide rods  141  and  141 ′ deviate from the disk D the moment when the loading of the disk D is completed. 
     Hereinafter, the deviation of the roller  53  from the bottom surface of the disk D due to the movement of the first and second lifting plates  90  and  130  will be described. 
     The first lifting plate  90  allows the roller  53  to be lifted by lifting the roller bracket  50 . This prevents the roller  53  from disturbing the rotation of the disk D during the operation of the disk D. As illustrated in FIG. 19, a cam hole  95  having a sloping cam portion  96  for driving the roller bracket  50  by supporting the roller shaft  51  is formed at one side of the first lifting plate  90 . As the first lifting plate  90  is moved, the roller shaft  51  is guided toward a lower part of the sloping cam portion  96 . Whereby, the roller bracket  50  is rotated round the hinge points  50   h  for thereby deviating the roller  53  from the bottom surface of the disk D. 
     The moving direction of the second lifting plate  130  is opposite to the direction of the first lifting plate  90 . This is because the second interlocking arm  101 ′ of the clamping driving plate  100  is rotated in a clockwise direction. 
     Hereinafter, the separation of the first and second holder rods  66  and  68 , vertical guide rods  141  and  141 ′, and sensor rods  83  for supporting the sides of the disk D from the sides of the disk D will be described. 
     First of all, in order to prevent disturbance to disk rotation by separating the first and second holder rods  66  and  68  from the disk D at the terminal stage of the loading operation of the disk D, cam portions  92  and  132  are formed on the first and second lifting plates  90  and  130 . As the interference avoiding bosses  65   r  and  67   r  are guided to the cam portions  92  and  132 , the first and second holder rods  66  and  68  are separated from the sides of the disk D. 
     In addition, the interference avoiding groove  97  interlocking with the vertical guide lever  140  is formed to have a bent end shape. The interference avoiding groove  97  thusly described allows the vertical guide rod  141  at the vertical guide lever  140  to be separated from the sides of the disk at the terminal stage of disk loading. The vertical guide rods  141  and  141 ′ are separated from the sides of the disk D as the vertical guide levers  140  and  140 ′ are guided to the bent end portions of the interference avoiding grooves  97  and  137  of the lifting plate  90  and  130 . 
     The sensor rod  83  is separated from the disk D as the guide boss  81  of the sensor lever  80  is guided to a curved portion of the first guide slot  76  of the driving plate  70 . 
     In addition, in order to restrict the path through which the first lifting plate  90  is moved, as illustrated in FIG. 19, there are two guide slots  96  and  98 ′ in which guide pins  20   p  fixed on the upper chassis  20  are inserted. 
     The thusly constructed disk transferring device in accordance with the present invention can receive and transfer both 12 cm and 8 cm disks, and the disk is guided by a plurality of levers interlocking with each other. Thus, the moving operation of the disk is always precisely performed for thereby increasing the reliability of the product, and achieving the lightening, thinning, shortening, and miniaturizing of the disk drive as a on the whole. 
     Particularly, since the balance levers and the holder levers for guiding the disk during power connection for the clamping of the disk are not moved, the roller for transferring the disk receives less load, to thereby improve reliability and durability. 
     As the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, unless otherwise specified, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the metes and bounds of the claims, or equivalences of such metes and bounds are therefore intended to be embraced by the appended claims.