Patent Publication Number: US-2010118446-A1

Title: Disk-chucking device

Description:
CROSS REFERENCE OF RELATED APPLICATIONS 
     This application claims the benefit of Chinese patent application No. 200510033720.9 filed Mar. 17, 2005 which is explicitly incorporated by reference in its entity. This application is a divisional of U.S. application Ser. No. 11/377,880 filed Mar. 16, 2006. 
    
    
     TECHNICAL FIELD OF THE INVENTION 
     The present invention relates to a disk-chucking device, and more particular, to a disk-chucking device comprising a pressing member having a circular groove provided around a circumference of the pressing member in the height direction thereof, and a clamping member which can removably clamp the circular groove of the pressing member. 
     BACKGROUND OF THE INVENTION 
     When a conventional disk player plays a disk, firstly, the disk is inserted into an entrance; secondly, the disk is introduced into an inner portion of the player; and thirdly, the disk is disposed onto a disk support. For example, a car disk player always employs such a kind of disk players. However, the conventional disk player fails to consider a specific position of the disk player. Moreover, the conventional car disk player usually employs a spring or an elastic part but not a permanent magnet which is usually used in a household disk player to chuck the disk onto the disk support. Thus, if one wants to use a disk player having a permanent magnet to secure the disk onto the disk support, it is necessary to consider the position of the disk player. 
     Currently, a disk-chucking device for chucking the disk onto the disk support is available in the market. The disk-chucking device comprises a clamp member including a permanent magnet therewithin. The clamp member is embedded into a support hole of a support board. Since the clamp member is enclosed by the support hole, the diameter of the support hole must be larger than the diameter of a clamp member in order to ensure that the clamp member can be turned freely. Therefore, when chucking a disk by using the above disk-chucking device, the center of the disk is easy to deviate from the center of the disk support. Even though some disk-chucking devices having a variable support hole which can be opened or closed corresponding to the introduction of the disk is present in the market, however, theses disk-chucking devices can not play disks with different sizes. 
     SUMMARY OF THE INVENTION 
     The present invention is provided to overcome the above-mentioned problems in the prior art by providing a disk-chucking device which can chuck disks having different sizes regardless of a loading position thereof. By using the present disk-chucking device, a pressing member of the disk-chucking device can be moved close to a disk support to further chuck a disk onto the disk support while keeping the center of the pressing member aligned with the center of the disk support. Moreover, the chuck of the disk by the pressing member will not hinder a rotation of the disk. 
     According to an embodiment of the present invention, a disk-chucking device used for a disk player is provided. The disk-chucking device comprises a pressing member providing a first through hole at the center thereof and a circular groove at the side thereof; a turning plate having a second through hole at the center thereof which allows the pressing member passing through, and a plurality of first notch portions disposed along the circumference of the second through hole; a plurality of clamping members mounted on the turning plate at the notch portions respectively, each of the clamping members providing a clip to removably clamp the circular groove of the pressing member; and a mounting board disposed at an upper portion of the disk player, providing a third though hole at its center which is aligned with the second through hole, and defining a plurality of second notch portions to receive the clamping members respectively, wherein the turning plate is slidably connected to the mounting board through the clamping member, the turning plate can rotate with respect to the mounting board, and the pressing member can be pressed onto and removed from a disk support of the displayer according to the rotation of the turning plate. 
     According to an aspect of the embodiment, the turning plate further provides a first connecting member disposed at a periphery thereof with which the turning plate is engaged to a swivel plate of the disk player, so that the turning plate can be turned by controlling a rotation of the swivel plate. 
     According to another aspect of the embodiment, the turning plate further provides a second connecting member at a periphery thereof, the second connecting member is connected to an elastic member mounted on the mounting board. 
     According to another aspect of the embodiment, the turning plate comprises a plurality of supporting portions, a sliding portion of each of the clamping members is disposed on the supporting portion through a shaft of the clamping member, one end of the sliding portion is connected to the clip extending inwards and another end of the sliding portion is connected to an elastic portion which is mounted on the turning board. 
     According to another aspect of the embodiment, each of the supporting portions comprises a first quadrate support and a second quadrate support, the first quadrate support provides a fixing hole and the second quadrate support provides a channel, and the shaft of the clamping member is inserted into the fixing hole and the channel so that the sliding portion is movable in a direction of the movement of the turning plate. 
     According to another aspect of the embodiment, an insert is provided extended upwards from the fringe of the second notch portion, the insert is inserted into the first notch portion, and when the turning plate rotates to a place, the insert is barred by the shaft so that the sliding member can release the pressing member onto the disk support. 
     According to another embodiment of the present invention, a disk-chucking device used for a disk player is provided. The disk-chucking device comprises a pressing member providing a first through hole at the center thereof and a circular groove at the side thereof; a turning plate having a rear portion mounted on a mounting board; and two clamping members engaged with each other being connected to the turning plate, each of the two clamping members providing a clip to removably clamp the circular groove of the pressing member, wherein the turning plate can rotate with respect to the rear portion of the turning plate, which further moves the clips of the clamping members vertically, so that the pressing member clasped by the clips can be pressed onto and removed from a disk support of the displayer. 
     According to another aspect of the embodiment, the turning plate further comprises a first connecting member and a second connecting member on a side portion thereof through which the turning plate is engaged to a swivel plate of the disk player; so that the turning plate can be turned by controlling a rotation of the swivel plate. 
     According to another aspect of the embodiment, the disk-chucking device further comprises an elastic member connected to the two clamping members. 
     According to another aspect of the embodiment, a third connecting member is provided on one of the clamping members, and when the swivel plate rotates to a place, the connecting member is barred by the swivel plate so that the clips of the clamping members can be rotated outwards according to the engagement therebetween, thereby releasing the pressing member onto the disk support. 
     By using the disk-chucking device of the present invention, the pressing member can be moved close to the disk support while keeping the center of the pressing member aligned with the center of the disk support, then the disk is located onto the disk support, after that the pressing member is released from the clamping member which thereby can be rotated freely. In this manner, the present disk-chucking device can chuck the disk securely regardless of the position of the disk player. In addition, the pressing member will be kept at an immovable state by the clips of the clamping member if the disk is not chucked, so that there is no noise generated even if the disk player is subjected to somewhat vibration. Moreover, the disk-chucking device of the present invention is suitable for disks with different sizes. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is an exploded perspective view of a disk-chucking device according to a first embodiment of the present invention; 
         FIGS. 2A ,  2 B, and  2 C are schematic views showing a structure of a disk player employing the disk-chucking device of  FIG. 1 ; 
         FIG. 3  is a state view of the disk player in which a smaller disk is inserted into an entrance of the disk player; 
         FIG. 4  is a state view of the disk player in which the smaller disk is engaged with a smaller disk baffle of the disk player; 
         FIGS. 5A and 5B  are state views in which a smaller disk is not chucked during an operation of loading the smaller disk; 
         FIGS. 6A and 6B  are state views in which a smaller disk is chucked; 
         FIG. 7  is a state view of the disk player in which the smaller disk is in a play situation; 
         FIG. 8  is a state view in which the smaller disk is chucked and disengaged from a feeding roller  5  and a driving plate  23 ; 
         FIG. 9  is a state view of the disk player in which a larger disk is inserted into an entrance of the disk player; 
         FIG. 10  is a state view of the disk player in which the larger disk is engaged with a larger disk baffle of the disk player; and 
         FIG. 11  is a perspective view of a disk-chucking device according to a second embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     According to the present invention, the disk-chucking device comprises a pressing member and a clamping member which clamps the pressing member. The pressing member can be moved close to the disk support corresponding to a movement of the clamping member, while keeping a center of the clamp member aligned with a center of the disk support. 
     The disk-chucking device of the present invention will now be described with reference to the drawings. 
     Referring to  FIG. 1 , the disk-chucking device of an embodiment comprises a pressing member  27 , a second turning palate  28 , and a mounting board  2 . The pressing member  27  comprises a permanent magnet  27   a  which is provided within the pressing member  27 , a circular groove  27   b  which is provided around a circumference of the pressing member  27 , and a first through hole  27   c  at the center of the pressing member  27  for receiving a center column of the disk support. The second turning plate  28  (circular turning plate) is provided at the center of a mounting board  2 . The second turning plate  28  comprises a second through hole  28   c  at the center thereof for receiving the pressing member  27 , three first notch portions  28   f  provided along the circumference of the second through hole  28   c , three supporting portion  281  respectively disposed at the first notch portions  28   f . Each of the supporting portion  281  comprises a first quadrate support  282  providing a fixing hole  28   b  and a second quadrate support  283  providing a channel  28   a.    
     Three clamping members  31  are mounted on the supporting portions  281 . Each clamping member  31  comprises a shaft  31   a , and a sliding portion  31   d  on which a contacting part  31   b  is provided. The contacting part  31   b  is contact with a surface of the mounting board  2 . The shaft  31   a  is inserted into the fixing hole  28   b  and the channel  28   a  of the supporting portion  218 , so that the clamping members  31  is movably mounted on the second turning plate  28 . 
     A rod spring  32  (a first elastic member) is mounted on the second turning plate  28  with an spring end  32   a  connected to the sliding portion  31   d , which provides a force to urge a clip  31   c  of each clamping member  31  to clasp the circular groove  27   b  and another force to urge the pressing member  27  to approach to the disk support. Three second notch portions  2   c  (cut portion) are formed around a third through hole  2   e  at the center of the mounting board  2  for receiving the clamping members  31 , and three insert  2   d  which can respectively engage with the clamping members  31  are provided at fringes of the three second notch portions  2   c , respectively. 
     In order to ensure that the clip  31   c  of each of the clamping members  31  can be released from the circular groove  27   b  of the pressing member  27 , the fixing hole  28   b  is configured to be a square-shaped or round-shaped hole and the channel  28   a  is configured to be a long hole extending parallel to a rotating direction of the second turning plate  28 , so that the support shaft  31   a  can be moved within the channel  28   a  while fixed in the fixing hole  28   b.    
     The second turning plate  28  further comprises a first connecting member  28   d  which is engaged with a swivel plate  29  connected to the mounting board  2 , and a second connecting member  28   e  at an outside thereof opposite to the first connecting member  28   d  to connect the mounting board  2  by a resilient spring  30  (a second elastic member). 
       FIGS. 2A ,  2 B, and  2 C are schematic views showing a structure of a disk player which employs the above-mentioned disk-chucking device. As shown in these figures, the mounting board  2  which covers the whole device is disposed within a housing  1  of the disk player. On the mounting board  2  are provided a detecting mechanism for detecting the size of the disk, a disk-chucking device for chucking the disk onto the disk support, a disk center locating mechanism for transmitting the disk from the entrance  4  onto the disk support, and a driving mechanism for driving a feeding roller drive mechanism. Moreover, a guide plate  6  for chucking a disk which is inserted into the entrance  4  through the feeding roller  5 , and a larger disk baffler  7  are also provided on the mounting board  2 . 
     On the other hand, the feeding roller drive mechanism is provided on a side portion of the housing. The feeding roller drive mechanism comprises a feeding roller support plate  8  for supporting the feeding roller  5 , a spring (not shown) for turning the support plate  8  so that the feeding roller can abut against the guide plate  6 , and a gear assembly (not shown) for transmitting power from a driving motor (not shown) to the feeding roller  5 . A control plate  9  (control unit) mounted on a side surface of the housing  1  is able to be moved according to the engagement between the drive mechanism and the driving motor. The control plate  9  provides a cam  9   a  engaged with the feeding roller support plate  8 . When the control plate  9  is moved towards the entrance by the power of the driving motor, the cam  9   a  can make the feeding roller  5  apart from the guide plate  6 . Moreover, the housing  1  is provided with a disk support motor  3  for supporting the disk support, and a pickup  10 . The disk support  3  has a center column  3   b  which can be embedded into the center hole of the disk. An inclined plane  3   c  is formed on a front portion of the center column for guiding the center hole of the disk to enclose the center column  3   b . Furthermore, a magnetic material is provided within a carrying surface  3   d  which carries the disk. A loading route of the disk is defined as the route located between the entrance  4  and the larger disk baffler  7 . 
     The disk detecting mechanism is disposed adjacent to the disk entrance  4 . The disk detecting mechanism comprises a pair of detecting levers  11  and  12  which are respectively located at a right portion and a left portion of the entrance  4 , a connecting plate  13  which connects the detecting lever  11  to the detecting lever  12 , and a first switch  14  and a second switch  15  for transmitting an electronic signal according to a turning degrees of the detecting levers. The detecting levers  11 ,  12  provide two engaging pins  11   a ,  12   a  which are engaged with the connecting plate  13 , and two detecting pieces  11   b ,  12   b  each of which has an end contact with a periphery of the disk. The detecting pieces  11   b ,  12   b  are disposed adjacent to the entrance  4 , so that the detecting levers  11 ,  12  can come into contact with the periphery of the disk and then be pushed to rotate outwardly when a disk is inserted into the entrance  4 . On the other hand, a motion of one of the detecting levers  11 ,  12  can be transmitted to the other one of the detecting levers  11 ,  12  through the connecting plate  13 . For example, if the left detecting lever  11  itself is rotated clockwise around a turning pivot  11   d , the connecting plate is moved rightward to thereby rotate the right detecting lever  12  anticlockwise. Moreover, if the right detecting lever  12  itself is rotated anticlockwise around a turning pivot  12   d , the connecting plate is moved rightward to thereby rotate the left detecting lever  11  clockwise. 
     Furthermore, contact pins  11   e ,  12   e  are provided on the detecting levers  11 ,  12 , respectively. A first contact part  13   b  for engaging or disengaging with the contact pin  12   e  of the right detecting lever  12  and a second contact part  13   c  for engaging or disengaging with the contact pin  11   e  of the left detecting lever  11  are provided on the connecting plate  13 . The contact pins  11   e ,  12   e  are located at a straight line defined between the turning pivots  11   d  and  12   d  of the detecting levers  11 ,  12 . In addition, there exists a certain distance between the contact pins  11   e ,  12   e  and their corresponding contact parts  13   c  ,  13   b . In this manner, the contact pin  11   e  will not contact with the second contact part  13   c  when the left detecting lever  11  is rotated clockwise. However, if the left detecting lever  11  itself is rotated clockwise which in turn drives the connecting plate  13  to move rightward, the contact pin  12   e  of the right detecting lever  12  will come into contact with the first contact part  13   b , so as to restrict the connecting plate  13  from moving rightward, and thereby prevent the left detecting lever  11  from rotating clockwise. 
     On the other hand, the contact pin  12   e  will not contact with the first contact part  13   b  when the right detecting lever  12  is rotated anticlockwise. However, if the right detecting lever  12  itself is rotated anticlockwise which in turn drives the connecting plate  13  to move rightward, the contact pin  11   e  of the left detecting lever  11  will come into contact with the second contact part  13   c , so as to restrict the connecting plate  13  from moving rightward, and thereby prevent the right detecting lever  12  from rotating anticlockwise. That is, if one of the detecting levers is rotated alone, the other one of the detecting levers will be restricted from rotating. Accordingly, the disk will not be introduced into the entrance  4  unless the disk is exactly placed at the center of the entrance  4  to make the detecting levers  11 ,  12  rotate simultaneous. Therefore, according to the present embodiment, the disk can be introduced into the center of the entrance and then placed onto the disk support quickly and securely. 
     A switch cam  11   c  is mounted on the left detecting lever  11 . The switch cam  11   c  can turn on the first and the second switches  14 ,  15  mounted on the mounting board  2 , so as to make the first switch  14  send out an electronic signal to stop the drive motor after a smaller disk is ejected out of the entrance  4 , and make the second switch  15  send out an electronic signal to stop the drive motor after a larger disk is ejected out of the entrance  4 . A first spring  16  which provides a force to urge the connecting plate  13  to move leftward is mounted on the connecting plate  13 . Then, the connecting plate  13  can urge the left detecting lever to rotate anticlockwise and the right detecting lever to rotate clockwise through the force exerted by the first spring  16 . 
     The smaller disk D 1  center locating mechanism comprises a first guide part  17  which is mounted on the mounting board  2  close to the right detecting lever  12  and is capable of rotating freely, a second guide part  18  which is mounted on the mounting board  2  close to the left detecting lever  11  the and is capable of rotating, a smaller disk baffler  19 , a sliding plate  20  for driving the smaller disk baffler  19 , and a portion of the connecting plate  13 . The first guide part  17  comprises a first contact piece  17   a  which can contact with a strip  13   a  of the connecting plate  13 , and a first guide piece  17   b  located on the loading route of the disk. The first guide part  17  exerts a turning force to the first guide piece  17   b  through a spring (not shown) to place the first guide piece  17   b  on the loading route of the disk, so as to make the first contact piece  17   a  against the strip  13   a.    
     The second guide part  18  comprises a second contact piece  18   a  which is engaged with a first protruding piece  20   a  of the sliding plate  20 , and a second guide piece  18   b  located on the loading route of the disk. The second guide part  18  exerts a turning force to the second guide piece  18   b  through a spring (not shown) to place the second guide piece  18   b  on an loading route of the disk, so as to make the second contact piece  18   a  against the first protruding piece  20   a . The second guide piece  18   b  is located at a point which is slightly away from the periphery of the smaller disk D 1  with respect to a cross point between the loading route of the disk and a center line of the disk support perpendicular to the loading route. The sliding plate  20  can transmit a motion of the connecting plate  13  through a joint plate  21 . The sliding plate  20  comprises the first protruding piece  20   a , an operating piece  20   b  of a third switch  22 , a second protruding piece  20   c  engaged with the smaller disk baffler  19 , and a first recess  20   d  engaged with the first turning plate  24  which can control a rotation of the driving plate  23  (driving part). The motor is started up as soon as the third switch  22  is turned on by the operating piece  20   b.    
     The smaller disk baffler  19  is located on the loading route of the disk. The smaller disk baffler  19  comprises two restraining chips  19   a  which are contact with the periphery of the smaller disk, a turning shaft  19   b  for supporting the restraining chips, and a third contact piece  19   c  disposed against the second protruding piece  20   c , when the smaller disk D 1  is placed on the disk support. In addition, if the sliding plate  20  is moved, the second protruding piece  20   c  can press the third contact piece  19   c , and the restraining chips  19   a  can make the turning shaft  19   b  rotate. In this manner, a front portion of the restraining chips  19   a  can be rotated in a direction towards the entrance  4 , thereby departing from the loading route of the disk. Moreover, the first guide piece  17   b , the second guide piece  18   b , and the restraining chips  19   a  are disposed with a distance, which is slightly larger than a radius of the smaller disk, from the center of the disk support  3 . Preferably, the larger portion between the distance and the radius of the smaller disk is equal to a moving distance needed for positioning the center hole of the disk from the inclined plane  3   c  of the center column  3   b  to the center of the disk support  3 , when the center hole of the disk is embedded around the center column  3   b  of the disk support  3 . That is, the moving distance is exactly the space for embedding the disk. 
     A center locating mechanism of the larger disk D 2  comprises linear rails  1   a  which are respectively mounted on a left portion and a right portion inside the housing  1 , and an arch-shaped larger disk baffler  7 . The distance between the linear rails  1   a  is slightly larger than the diameter of the larger disk D 2 . In addition, the larger disk baffler  7  is mounted on a disk support for supporting the larger disk, which is slightly apart from a periphery of the larger disk with a deviated distance. Preferably, the deviated distance is equal to a moving distance needed for positioning the center hole of the disk from the inclined plane  3   c  of the center column  3   b  to the center of the disk support  3 , when the center hole of the disk is embedded around the center column  3   b  of the disk support  3 . Moreover, the linear rails la and the larger disk baffler  7  are used to direct the disk D 2  onto the disk support during the introduction of the disk. 
     The drive mechanism comprises the driving plate  23  which can be rotated by abutting against the periphery of the disk when the disk is introduced onto the disk support, and the first turning plate  24  for controlling a turning pivot of the driving plate  23 . A pillar  23   a , which is projected into the loading route of the disk and contacts with the periphery of the introduced disk, is provided at an end of the driving plate  23 . An extended piece  23   b , which is engaged with a bottom surface of the disk for supporting the disk, is provided on a front portion of the driving plate  23 . An extended part  23   c , which is engaged with a crank aperture  9   b  located on the control plate  9 , is provided on the other end of the driving plate  23 . A turning shaft  23   d , which is embedded into an elongate aperture  2   a  located on the mounting board  2 , is provided on a center portion of the driving plate  23 . In addition, a second spring  25  is attached to the driving plate  23  for exerting a weak force to urge the pillar  23   a  towards the entrance  4 . 
     On the other hand, a first arch-shaped aperture through which the pillar  23   a  is inserted is formed on the mounting board  2 . The first turning plate  24  can be rotated freely on the mounting board  2  due to the axial support by an axis  24   a , so as to make the turning shaft  23   d  of the driving plate  23  embed into a second arch-shaped aperture  24   b  which is configured around the axis  24   a . A linear aperture  24   c  that is overlapped with the elongate aperture  2   a  is provided at an end of the second arch-shaped aperture  24   b , and a recess  24   d  that is parallel to the second arch-shaped aperture  24   b  is provided at an end of the linear aperture  24   c . Moreover, a bracket  24   e  which is engaged with a first recess portion of the sliding plate  20  is provided on the first turning plate  24 . 
     The crank aperture  9   b  of the control plate  9  is used to drive an end of the driving plate  23  to approach to the mounting board  2  and to make the driving plate  23  to rotate around the turning shaft  23   d  towards the introduced direction of the disk, corresponding to the movement of the control plate  9 . That is, when the disk is introduced adjacent to the baffler, the pillar  23   a  of the driving plate  23  can abut against the periphery of the disk, and the driving plate  23  can be turned with the bottom surface of the disk supported the extended piece  23   d . By virtue of the turning of the driving plate  23 , the extended part  23   c  of the driving plate  23  abuts against a first side edge of the crank aperture  9   b  to move the control plate  9 . At this time, the control plate  9  begins to move by the power of the driving motor. Thus, the crank aperture  9   b  pushes the extended part  23   c  up towards the mounting board  2 . By such a push motion, the pillar  23   a  of the driving plate  23  is also turned towards the mounting board  2  around the turning shaft  23   d , so that the extended piece  23   b  of the driving plate  23  can approach to the carrying surface  3   d  of the disk support  3  while supporting the bottom surface of the disk. 
     After the disk reaches the disk support  3 , the crank aperture  9   b  is kept turning to drive the end of the driving plate  23  to move towards the mounting board  2  so as to make the extended piece  23   b  depart from the bottom surface of the disk. Then, according to the movement of the control plate  9 , a second side edge of the crank aperture  9   b  presses the extended part  23   c  to drive the pillar  23   a  of the driving plate  23  to turn towards the introduced direction of the disk, so as to make the pillar  23   a  depart from the periphery of the disk. In addition, the control plate  9  further provides a first contact piece  9   c  and a second contact piece  9   d  for driving the crank mechanism, and a third contact piece  9   e  for turning on/off a fourth switch  26 . Here, the first contact piece  9   c , the crank aperture  9   b  and the cam  9   a  are configured to drive the disk to approach to the disk support, drive the feeding roller  5  to depart from the guide plate  6 , and drive the pressing member  27  to approach to the disk support  3 , simultaneously, while at the same time keeping the bottom surface of the disk supported by the extended piece  23   b.    
     Referring to  FIGS. 1 and 2 , a resilient spring  30  is provided between the second turning plate  28  and the mounting board  2  to make the second turning plate retain at a terminal point of the turning. When the second turning plate  28  is rotated, the sliding portions  31   b  are slid into the second notch portions  2   c  of the mounting board  2 , the clamping members  31  can drive the clips  31   c  to approach to the disk support through a force exerted by the rod spring  32 . In this way, the clips  31   c  can approach to the disk support  3  while clasping the pressing member  27 . Since the disk support  3  is filled with the magnetic materials, the disk is chucked onto the disk support  3  by means of the permanent magnet  27   a  within the pressing member  27 . If the second turning plate  28  is kept rotating, the support shafts  31   a  of the clamping members  31  may come into contact with the insert  2   d  to cause the clips  31   c  of the clamping members  31  to release from the circular groove  27   b  of the pressing member  27 , which thereby makes the rotation of the disk possible. 
     The introduction process of the smaller disk is described as follows. 
       FIG. 3  is a view showing that a smaller disk is inserted into the entrance  4 . The two detecting levers  11 ,  12  abut against the periphery of the smaller disk D 1  and are turned outwards in a small amount (small turning degrees), when a front portion of the smaller disk D 1  is inserted into a position between the feeding roller  5  and the guide plate  6 . At this time, the connecting plate  13  is moved rightward slightly according to the turning of the detecting levers  11 ,  12 , so that the sliding plate  20  is moved towards the entrance through the joint plate  21 . According to the movement of the sliding plate  20 , the third switch  22  is turned on by the operating piece  20   b , so as to start up the driving motor. Thus, the feeding roller  5  is rotated to insert the smaller disk D 1  into the entrance and introduce the smaller disk D 1  towards the inside of the device. On the other hand, since the connecting plate  13  is moved just in a small amount, the strip  13   a  will not engage with the first contact piece  17   a , so that the first guide piece  17   b  of the first guide part  17  is located on the loading route of the disk. 
     Moreover, since the sliding plate  20  is also moved just in a small amount, the first protruding piece  20   a  will not engage with the second contact piece  18   a . Thus, the second guide piece  18   b  of the second guide part  18  is located on the loading route of the disk. At this time, the clamping members  31  mounted on the second turning plate  28  clasping the pressing member  27  is restrained in a clamping position by the resilient spring  30 , and the pressing member  27  is raised above center column  3   b  of the disk support  3  by the clips  31   c  of the clamping members  31  for that the sliding portions  31   b  are contact with the mounting board  2 . Thus, the smaller disk D 1  will not contact with the pressing member  27  but be placed in a position between the pressing member  27  and the disk support  3  (as shown in  FIG. 4 ) due to the guide of the first guide part  17  and the second guide part  18 . On the other hand, the center of the pressing member  27  is in alignment with the center column  3   b  of the disk support  3 . 
       FIG. 5  shows that a smaller disk D 1  is introduced in such a position that a periphery of the disk D 1  is contact with the restraining chips  19   a  of the smaller disk baffler  19 . At this time, the turning shaft  23   d  of the driving plate  23  is positioned at an immovable state according to the elongate aperture  2   a  and the second arch-shaped aperture  24   b . In addition, the front portion of the smaller disk D 1  presses the pillar  23   a  of the driving plate  23  to drive the driving plate  23  to turn anti-clockwise around the turning shaft  23   d , so that the extended part  23   c  can press a side edge the crank aperture  9   b  of the control plate  9  to move the control plate  9  towards the entrance. Moreover, the driving motor can provide a power to facilitate the movement of the control plate  9 . Then, the first contact piece  9   c  of the control plate  9  is engaged with the swivel plate  29  to rotate the swivel plate  29  anti-clockwise so as to rotate the second turning plate  28  clockwise through the first connecting member  28   d . At the same time, the bottom surface of the smaller disk is supported by the extended piece  23   b  as shown in  FIG. 5 . 
     The cam  9   a  is engaged with the feeding roller support plate  8  for guiding the feeding roller  5  apart from the guide plate  6 , while the second turning plate  28  is turning. At the same time, the crank aperture  9   b  causes the pillar  23   a  of the driving plate  23  to rotate close to the mounting board  2 . According to the rotation of the driving plate  23 , the extended piece  23   b  can move in a direction same to the moving direction of the feeding roller  5  while supporting the bottom surface of the smaller disk D 1 . 
     Moreover, the sliding portions  31   b  of the clamping members  31  are slid into the second notch portions  2   c  of the mounting board  2  as the second turning plate  28  rotates. And then, the clips  31   c  of the clamping members  31  cause the smaller disk and the pressing member  27  to approach to the disk support  3  simultaneously under the action of the rod spring  32  as shown in  FIG. 6 . At this time, the center of the pressing member  27  is aligned with the center of the disk support  3  as the clamp member is moved close to the disk support  3  by means of the clamping members  31 . In the meantime, the smaller disk is positioned onto the disk support  3  according to the guide of the two restraining chips  19   a  located in the inner side of the device, and the first guide piece  17   b  and the second guide piece  18   b  separately located at the left and the right of the disk support. Thus, the smaller disk D 1  can be correctly positioned onto the disk support  3  by means of the extended piece  23   b , the pressing member  27  and the feeding roller  5 , even if the feeding roller  5  is released from the guide plate  6 . 
       FIG. 7  shows that the smaller disk is in a play situation. The smaller disk D 1  can be secured on the disk support by the permanent magnet within the clamp member  27 . When the smaller disk D 1  is introduced to the inclined plane  3   c  engaging with the center column of the disk support  3 , the smaller disk can be slightly moved towards the entrance due to the inclined plane  3   c , so that the periphery of the smaller disk is apart from the baffler  19   a . In addition, the extended part  23   c  is pushed towards another side of the crank aperture  9   b , the driving plate  23  continues to rotate anti-clockwise, so that the pillar  23   a  is completely released from the periphery of the smaller disk. Moreover, as shown in  FIG. 8 , the feeding roller  5  and the extended piece  23   b  are also released from the bottom surface of the smaller disk D 1 , which will not hinder the rotation of the smaller disk D 1 . 
     Moreover, as the second turning plate  28  rotates, the support shafts  31   a  come into contact with the insert  2   d  of the mounting board  2 , and then, the insert  2   d  can press the shafts  31   a  to further rotate the clamping members  31  anti-clockwise around the fixing hole  28   b . After that, the clips  31   c  of the clamping members  31  are released from the circular groove  27   b , so that the pressing member  27  is able to rotate together with the disk support. In addition, the resilient spring  30  is compressed when the second turning plate  28  is rotated clockwise, so that the second turning plate  28  and the clips  31   c  of the clamping members  31  can be released from the circular groove  27   b  under the resilient force of the resilient spring  30 . After that, the third contact piece  9   e  can turn off the fourth switch  26  to further stop the driving motor. 
     As stated above, the smaller disk D 1  is introduced onto the disk support  3  according to the guide of the two restraining chips  19   a  located in the inner side of the device, and the first guide piece  17   b  and the second guide piece  18   b  separately located at the left and the right of the disk support, so that the smaller disk D 1  can be correctly positioned onto the disk support  3 , even if the feeding roller  5  is released from the guide plate  6 . In addition, the pressing member  27  and the disk support may comprise permanent magnets, respectively, so that the disk can be secured on the disk support according to a magnetic force between the magnets. Accordingly, the introduction of the disk can be performed securely regardless of the position of the disk player. 
     Moreover, the restraining chips  19   a , the first guide piece  17   b , and the second guide piece  18   b  will not be moved during the introduction of the smaller disk, so that the disk-chucking device of the present invention is relatively simple in configuration. 
     The introduction process of the larger disk is described as follows. 
       FIG. 9  shows that a larger disk D 2  is inserted into the entrance  4  through the feeding roller  5 . The two detecting levers  11 ,  12  abut against the periphery of the larger disk D 2  so that the detecting levers  11 ,  12  can be turned in a great amount (large turning degrees). Thus, the connecting plate  13  is also moved in a great amount, so that the strip  13   a  can engage with the first contact piece  17   a  to rotate the first guide part  17  and make the first guide piece  17   b  retreat from the loading route of the disk. Moreover, the sliding plate  20  is also moved in a great amount so that the first protruding piece  20   a  can engage with the second contact piece  18   a , which rotates the second guide part  18  to further make the second guide piece  18   b  retreat from the loading route of the disk. Furthermore, as the sliding plate  20  is moved greatly, the second protruding piece  20   c  can engage with the third contact piece  19   c  to rotate the smaller disk baffler  19  so as to make the restraining chips  19   a  retreat from the loading route of the disk. And then, the first recess  20   d  of the sliding plate  20  can engage with the bracket  24   e  of the first turning plate  24  to thereby rotate the first turning plate  24  anti-clockwise around the axis  24   a . According to the rotation of the first turning plate  24 , the turning shaft  23   d  of the driving plate  23  is located at a cross point of the second arch-shaped aperture  24   b  and the linear aperture, which thereby comes into a movable state. And then, the driving plate  23  is turned around a contact point of the extended part  23   c  and the crank aperture  9   b , while the turning shaft  23   d  is moved within the linear aperture  24   c  and the elongate aperture  2 . 
       FIG. 10  is a view showing that the larger disk D 2  is engaged with the larger disk baffle  7 . Here, the bracket  24   e  is employed to restrict the return of the sliding plate  20  by using the engagement between the turning shaft  23   d  and the recess  24   d  of the first turning plate  24 . Thus, the left and right detecting levers  11 ,  12  is kept at a position after turning a great range, so that the left and right detecting pieces  11   b ,  12   b  can release from the periphery of the larger disk D 2 . On the other hand, the turning shaft  23   d  is contact with an end of the elongate aperture  2   a  and the driving plate  23  is turned anti-clockwise, so that the control plate  9  is moved towards the entrance  4 . During the movement of the control plate  9 , the power from the driving motor is transmitted to the control plate  9  to continuously move the control plate  9  towards the entrance  4 . After that, the larger disk is chucked onto the disk support by the clamp member, which is similar to the introduction of the smaller disk. And then, the fourth switch  26  is turned off by the third contact piece  9   e  so as to stop the driving motor. 
     According to the present invention, the detecting levers  11 ,  12  further provide the contact pins  11   e ,  12   e , respectively, and the connecting plate  13  further provide a first contact part  13   b  and a second contact part  13   c  for respectively engaging and disengaging with the contact pins  11   e ,  12   e . In this way, the disk can be inserted into the entrance and introduced onto the disk support quickly and securely, only by locating the contact pins  11   e ,  12   e  at a straight line defined between the turning pivots  11   d ,  12   d  of the detecting levers  11 ,  12  before turning the detecting lever  11 ,  12 . 
     Moreover, the disk-chucking device comprises the pressing member  27 , the second turning plate  28  which is secured on the center of the mounting board  2  and capable of turning, the swivel plate  29  for transmitting the motion of the control plate  9  to the second turning plate  28  through the first contact piece  9   c , the resilient spring  30  for keeping the second turning plate at a terminal point of the turning, three clamping members  31  which are mounted on the second turning plate  28  through the support shafts  31   a , and the rod spring  32  for providing a force to urge a clip  31   c  of each clip to clasp the circular groove  27   b  and another force to urge the pressing member  27  to approach to the disk support. When using the disk-chucking device of the present invention, the clamp member is moved close to the disk support while keeping the center of the clamp member consistent with the center of the disk support, after that the disk is located onto the disk support, then the clamp member is released from the chucking state. Thus, the present disk-chucking device can chuck the disk securely regardless of the position of the disk player. In addition, the clamp member will be kept at an immovable state by the clips if the disk is not chucked, so that there is no noise generated even if the disk player is subjected to somewhat vibration. Moreover, the disk-chucking device of the present invention is suitable for disks with different sizes. 
       FIG. 11  is a perspective view of the disk-chucking device according to another embodiment of the present invention. The present embodiment 2 can also be employed in the above-mentioned disk player. 
     As shown in  FIG. 11 , the disk-chucking device of the embodiment 2 comprises a pressing member  40  including a circular groove  40   a  which is provided around a circumference of the pressing member  40 , and a turning plate  41  having a rear portion  411  thereof mounted on the mounting board  2 . The turning plate  41  is able to be turned around the rear portion  411 . A first connecting member  41   a  and a second connecting member  41   b  which are located on a side portion of the turning board  41  are engaged with a swivel plate  29  connected to the mounting board  2 . The swivel plate  29  is also engaged with a control part  9  of the disk player so as to provide a force driving the turning plate  41  to rotate around the rear portion  411  of the turning plate  41 . 
     Two clamping members  42 ,  43  which can be turned are provided on the turning board  41 . Two clips  42   c ,  43   c  are respectively provided on the clamping members  42 ,  43  for clasping the pressing member  40 . The clamping members  42  and  43  are engaged with each other through toothed portions  42   a  and  43   a  thereof. If the clip  42   c  of the clamping member  42  is released from the pressing member  40 , then the clip  43   c  of the clamping member  43  will also be released from the pressing member  40  according to the engagement of the toothed portions  42   a  and  43   a , and vice versa. An elastic part  44  is mounted between the clamping members  42  and  43  for providing a force so that the clips  42   c ,  43   c  of the clamping members  42 ,  43  can clasp the circular groove  40   a  of the pressing member  40 . A third connecting member  42   b  is provided on the clamping member  42 . When the swivel plate  29  is turned anti-clockwise to press the third connecting member  42   b , the clamping members  42 ,  43  will be released from the pressing member  40 . 
     The first connecting member  41   a  is configured to engage with the swivel plate  29  so that the front portion of the turning plate  41  can be turned upwardly around the rear portion  411 . The second connecting member  41   b  is configured to engage with the swivel plate  29  so that the front portion of the turning plate  41  can be turned downwardly around the rear portion  411 . In this way, the pressing member clasped by the clamping members  41  and  42  can be moved vertically through a through hole  2   f  provided on the mounting board  2  corresponding to the rotation of the swivel plate  29 . For example, the second connecting member  41   b  may be an inclined groove receiving an end of the swivel plate  29 , so that the turning plate  41  can be turned around the rear portion thereof when the end of the swivel plate  29  is slid within the inclined groove. 
     According to the disk-chucking device of the embodiment 2, the swivel plate  29  is engaged with the first connecting member  41   a  to locate the front portion of the turning plate  41  above the mounting board  2  before loading the disk, so that the clamping members  42 ,  43  can clasp the pressing member  40  above the mounting board. Moreover, when the swivel plate  29  is engaged with the second connecting member  41   b , the second connecting member  41   b  can be turned to further drive the front portion of the turning plate  41  to turn close to the mounting board  2 , so that the clamping members  42 ,  43  mounted on the turning plate  41  can clasp the pressing member  40  to approach to the disk support under the mounting board  2 . 
     As the swivel plate  29  is rotated anti-clockwise, the pressing member  40  is pressed onto the center column of the disk support. Then, the swivel plate  29  is engaged with and presses the third connecting member  42   b  of the clamping member  42 , thereby causing the clips  42   c ,  43   c  of the clamping members  42 ,  43  to rotate outwards through the engagement of the toothed portions  42   a  and  43   a . In this way, the clips  42   c ,  43   c  can be released from the circular groove  40   a , so that the pressing member  40  is able to be turned freely. In addition, the pressing member  40  and the disk support may comprise permanent magnets, respectively, so that the disk can be secured on the disk support according to a magnetic force between the magnets. According to the second embodiment of the invention, the disk-chucking device employs two clamping members  42  and  43  to clasp the pressing member  40 , which has a relatively simple configuration. 
     The present invention can be used not only in a household disk player, but also in a car disk player. Moreover, the disk-chucking device of the present invention can chuck disks with different sizes onto a disk support securely.