Abstract:
The present invention relates to a disc loading apparatus that has the capability of simplifying the assembly while improving thinning and reducing the number of components. With a disc loading apparatus according to the present invention, a portion of a top panel of the frame is designed to be a second mounting unit and another portion of the top panel to be a first mounting unit, the upper surface of the second mounting unit is sagged downward more than the lower surface of the first mounting unit, notches are provided appropriately at the steeped unit between the first and the second mounting units, the second mounting unit is a portion of the disc guide, the interlocking mechanism is mounted on the upper surface of the second mounting unit, and the pair of disc detection members is mounted on the lower surface of the first mounting unit, and these detection members are arranged throughout the lower surface of the first mounting unit and the upper surface of the second mounting unit through the notches.

Description:
BACKGROUND OF THE INVENTION 
       [0001]    1. Field of the Invention 
         [0002]    The present invention relates to a disc loading apparatus that devises simplifying assembly while improving thinning and reducing the number of components. 
         [0003]    2. Description of the Prior Art 
         [0004]    A disc loading apparatus that is able to load both large and small discs, generally provides a pair of right and left disc detection members having a detection unit, and also an interlocking mechanism is provided to make both disc detection members rotate synchronously, thereby detecting the disc position and disc diameter by the rotation amount while clamping of the disc by a roller and a disc guide, and the rotation of the roller are controlled. 
         [0005]    Japanese Laid-open patent publication 2002-298481 discloses a disc loading apparatus. An insert port ( 12 ) for inserting a disc is formed on the front surface of a chassis ( 11 ), a top guide ( 41 ) is attached to the lower surface of the chassis, and a pair of right and left disc arms ( 62 ), ( 63 ) are arranged between the lower surface of the chassis and the upper surface of the top guide. A plurality of guide protrusions ( 45 ), ( 46 ), ( 47 ) are provided on the lower surface of the top guide, and the disc is clamped between a loading roller ( 42 ) and the guide protrusions, and the disc is fed by the rotation of the roller. 
         [0006]    With the construction disclosed in Japanese Laid-open patent publication 2002-298481, because the guide protrusions must be provided at an overlapping position with the disc arms, the top guide is attached on the lower surface of the chassis, the disc arms are arranged between the top guide and the chassis, and the guide protrusions are provided on the lower surface of the top guide. However, improvement of thinning and reducing the number of components has been difficult because a process to attach the top guide to the chassis is required and a gap between the chassis and the top guide must be provided in order to arrange the disc arms. 
         [0007]    The present invention is achieved in consideration of such problems described above, and the object is to provide a disc loading apparatus with the ability to simplify assembly while improving thinning and reducing the number of components. 
       SUMMARY OF THE INVENTION 
       [0008]    The present invention proposes a disc loading apparatus which comprises a frame; a disc guide; a pair of disc detection members mounted in the frame providing detection units respectively; an interlocking mechanism mounted in the frame so as to synchronously rotate the detection members; and a roller mounted in the frame so as to clamp a disc in cooperation with the disc guide, and feed the disc by a rotational operation; wherein the pair of detection members rotate in the widening direction of the mutual gap of the detection members while each of the detection members is pushed to the circumference of the inserted disc; the disc position and disc diameter are detected by the rotation amount of the pair of disc detection members, and disc clamping by the roller and disc guide according to the disc position and the diameter, and the roller rotation are controlled, wherein the disc loading apparatus further comprises a top panel provided in the frame; a second mounting unit formed on a portion of said top panel; a first mounting unit formed on another portion of the top panel; a stepped unit formed between the first and second mounting units by sagging the upper surface of the second mounting unit downward more than the lower surface of the first mounting unit; and a notch formed in said stepped unit, and wherein a portion of the disc guide is constituted in the second mounting unit, and the interlocking mechanisms are mounted on the upper surface of the second mounting unit; the pair of disc detection members are mounted on the lower surface of the first mounting unit, and are arranged throughout the lower surface of the first mounting unit and the upper surface of the second mounting unit. 
         [0009]    Preferably, the rotation range of at least one of disc detection members is regulated by the end area of the notch. 
         [0010]    The second mounting unit formed by sagging a portion of the top panel of the frame is used as a portion of the disc guide and also the mounting unit of the interlocking mechanism, and a pair of disc detection members mounted on the first mounting unit is arranged throughout the lower surface of the first mounting unit and the upper surface of the second mounting unit so that the detection members and the interlocking mechanism correlate on the upper surface of the second mounting unit, and the number of components can be reduced by having various roles for the second mounting unit. This allows simplifying the construction and makes improvement of thinning easier as a result. Because the upper surface side of the second mounting unit is open, the interlocking mechanism can attach easily to the upper surface of the second mounting unit, simplifying the assembly. 
         [0011]    Furthermore, if the end of the notch is designed to be a stopper to regulate the rotation range of the disc detection member, there is no need to provide a stopper separately for the disc detection member, simplifying the construction even more. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0012]    This invention will become more apparent upon a reading of the following detailed description with reference to the accompanying drawings, in which: 
           [0013]      FIG. 1  is a diagrammatic perspective view showing a disc player that relates to the present invention. 
           [0014]      FIG. 2  is a diagrammatic perspective view showing the disc player shown in  FIG. 1  breaking out the upper unit and lower unit. 
           [0015]      FIG. 3  is a top plan view showing the upper unit. 
           [0016]      FIG. 4  is a top plan view showing the lower unit. 
           [0017]      FIG. 5  is a top plan view showing a disc detection mechanism and a disc size determination mechanism. 
           [0018]      FIG. 6  is a top plan view showing a disc positioning mechanism, a clamping mechanism, and a driving means. 
           [0019]      FIG. 7  is an exploded perspective view showing the composition of a clamper. 
           [0020]      FIG. 8  is an exploded perspective view showing a linking mechanism. 
           [0021]      FIG. 9  is a cross-sectional view showing a portion of the linking mechanism. 
           [0022]      FIG. 10  is a top plan view showing a loading mechanism. 
           [0023]      FIG. 11  is a lateral view showing the relationship between a portion of the upper gear group and a gear plate. 
           [0024]      FIG. 12  is an exploded perspective view showing the composition of a feeding means and a disc guide. 
           [0025]      FIG. 13  is a diagrammatic perspective view showing a detection means. 
           [0026]      FIG. 14  is a lateral view showing the composition of a main tracking adjustment means. 
           [0027]      FIG. 15  is a top plan view showing the composition of the main tracking adjustment means. 
           [0028]      FIG. 16  is a lateral view showing the composition of a sub-tracking adjustment means. 
           [0029]      FIG. 17  is a cross-sectional view showing a rotating member attachment mechanism in a state of use. 
           [0030]      FIG. 18  is a cross-sectional view showing a support member. 
           [0031]      FIG. 19  is a lateral view showing a fixed member. 
           [0032]      FIG. 20  is a top plan view showing the disc player in a state of use. 
           [0033]      FIG. 21  is a top plan view showing the disc player in a state of use. 
           [0034]      FIG. 22  is a top plan view showing the disc player in a state of use. 
           [0035]      FIG. 23  is a top plan view showing the disc player in a state of use. 
           [0036]      FIG. 24  is a top plan view showing the disc player in a state of use. 
           [0037]      FIG. 25  is a front view showing a state in which the dampers are released from the turntable by a releasing member. 
           [0038]      FIG. 26  is a front view showing the state in which a disc is clamped. 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       [0039]    Preferred Embodiments of the present invention will be described hereafter with reference to drawings. 
         [0040]      FIG. 1  is a diagrammatic perspective view showing the exterior of a mechanism unit  1  of a disc player used for automobiles. At the front surface, the mechanism unit  1  of the disc player provides a disc insertion port  2  where a large disc D 1  or small disc D 2  is inserted and ejected. An arrow A shows the disc insert direction, and the opposite direction indicates the disc eject direction. Together, the disc insert direction and disc eject direction are collectively referred to as the disc insert/eject direction. 
         [0041]      FIG. 2  is a diagrammatic perspective view showing the mechanism unit  1  of the disc player by breaking out an upper unit  3  and a lower unit  4 . 
         [0042]      FIG. 3  shows a top plane view of the upper unit  3 ; and  FIG. 4  shows a top plane view of the lower unit  4 . 
         [0043]    The upper unit  3 , as shown in  FIG. 2  and  FIG. 3 , comprises an upper frame  5  (shown by a virtual line), a disc detection mechanism  6 , a disc size determination mechanism  7 , a disc positioning mechanism  8 , a clamping mechanism  9 , and a portion of a loading mechanism  10 . 
         [0044]    The lower unit  4  comprises, as shown in  FIG. 2  and  FIG. 4 , a lower frame  11 , a damper  12  consisting of three buffer members, a pickup unit  15  including a turntable  13  with a built-in magnet and a pickup  14 , a circuit substrate  16  providing a control circuit, and another portion of the loading mechanism  10 . 
         [0045]    The upper frame  5  consisting of a nearly rectangular metal plate, as shown in  FIG. 2  and  FIG. 3 , has side panels formed by bending downward from four sides of a top panel  17 , and superposition units  20 ,  21  are provided at the front and rear respectively in the disc insert/eject direction of the right and left side panels  18 ,  19 . Further, the lower frame  11  consisting of a nearly rectangular metal plate, as shown in  FIG. 2  and  FIG. 4 , has side panels which are formed by bending upward from the four sides of a bottom panel  22 , and superposition units  25 ,  26  are provided at the front and rear respectively in the disc insert/eject direction of the right and left side panels  23 ,  24 . Furthermore, combining the upper frame  5  and lower frame  11  is performed by superimposing the mutually corresponding superposition units and fixing by screw  27 . 
         [0046]    The top panel  17 , as shown in  FIG. 2  and  FIG. 3 , forms a long recess in the lateral direction through extrusion processing facing downward from the upper surface and such area becomes a second mounting unit  28 , and the other area is a first mounting unit  29 . Further, at a stepped unit  30  between the first and second mounting units  29 ,  28 , a notch  31  is provided appropriately. Moreover, the second mounting unit  28  together with guide projections  203  which will be described hereafter constitutes a disc guide  32 , making the rear side thereof the disc feeding path. 
         [0047]    At the lower surface of the first mounting unit  29 , a portion of the disc detection mechanism  6 , a disc size determination mechanism  7 , a disc position mechanism  8 , a clamping mechanism  9 , and a portion of the loading mechanism  10  are loaded. 
         [0048]    At the upper surface of the bottom plate  22  of the lower frame  11 , as shown in  FIG. 2  and  FIG. 4 , each of the bodies  33  of the three dampers  12  are fixed. Further, a head  34  of each damper  12  is attached at a part of the pickup unit  15 , and the pickup unit  15  is supported in a floating state in relation to the lower frame  11  through these dampers  12 . Furthermore, as shown in  FIG. 4 , the circuit substrate  16  at the right side of the pickup unit  15  in the drawing is attached to the bottom plate  22 . 
         [0049]    Five switches in the control circuit are arranged on the circuit substrate  16  . A first switch  35  detects when either a large or small disc is inserted from the disc insertion port  2 . A second switch  36  detects when either a large or small disc is loaded completely on the turntable  13 . A third switch  37  detects when a large disc D 1  is discharged. A fourth switch  38  detects when a small disc D 2  is discharged. A fifth switch  39  as a disc insert detection switch detects when either a large or small disc is inserted within the disc player. 
         [0050]    Meanwhile, the right side plate  24  of the lower frame  11  is a bent piece  40  where the rear is bent inward, and a loading motor  41  that is a part of the loading mechanism  10  is loaded at the bent piece  40 . The loading motor  41  is connected to the control circuit on the circuit substrate  16  by wires. A worm gear  43  is loaded at a shaft  42  of the loading motor  41 . Further, at the interior surface of the right side panel  24 , a lower gear group  44  is equipped which receives the rotation of the worm gear  43 . 
         [0051]      FIG. 5  is a top plane view showing the disc detection mechanism  6  and the disc size determination mechanism  7 . The disc detection mechanism  6  comprises a pair of right and left and horizontally rotating disc detection members  45 ,  46 , a pair of right and left partial gears  47 ,  48  constituting an interlocking mechanism, and a pair of right and left coil springs  49 . The disc detection mechanism  6  is installed on the lower surface of the first mounting unit  29  and the upper surface of the second mounting unit  28 . 
         [0052]    The disc detection members  45 ,  46  detect whether an inserted disc size is large or small and are thereby mounted with the ability to rotate freely respectively at spindles  50 ,  51  which protrude to the lower surface of the first mounting unit  29 , and extend to the vicinity of the disc insertion port  2  passing through the upper surface side of the second mounting unit  28  from the notch  31 , and which have detection units  52 ,  53  (refer to  FIG. 2 ) which extend downward at each extended end. Both disc detection members  45 ,  46  have the ability to rotate freely within the range of the notch  31 , and maintain their initial position by causing a part to attach at the end of the notch  31  through the energizing force of the coil spring  49 . Further, the detection members  45 ,  46  have spindles  50 ,  51  and concentric gear units  54 ,  55 . 
         [0053]    Furthermore, a coupling pin  56  at the disc detection member  45  of the left side and a coupling pin  57  at the disc detection member  46  of the right side are arranged respectively. At the lower surface side of both disc detection members  45 ,  46 , inclined ribs  58 ,  59  are provided which incline so as to gradually increase in height when progressing downward from the vicinity of each gear unit  54 ,  55  towards the vicinity of each coupling pin  56 ,  57 . Moreover, elastic pieces  60 ,  61  are provided in the vicinity of the inclined ribs  60 ,  61 , and always elastically crimped at the lower surface of the first mounting unit  29  so that the generation of rattle noise by the vibration of detection members  45 ,  46  can be prevented. 
         [0054]    The pair of partial gears  47 ,  48  is mounted with the ability to rotate freely between both disc detection members  45  and  46  of the upper surface of the second mounting unit  28  through spindles  62 ,  63 . Each partial gear,  47 ,  48  has concentric first gear units  64 ,  65 , second gear units  66 ,  67 , and hooks  68 ,  69 ; and the second gears  66 ,  67  are mutually engaged, and each first gear unit  64 ,  65  is respectively engaged to the gear units  54 ,  55  of each disc detection member  45 ,  46 . Further, the coil spring  49  is hung between each hook  68 ,  69  and the second mounting unit  28 ; and the detection units  52 ,  53  of both disc detection members  45 ,  46  are energized in a direction to become closer to each other. 
         [0055]    In addition, in each partial gear  47 ,  48 , recessed units  70 ,  71  with one cog lacking are provided at each end of the first gear units  64 ,  65 , and salient units  72 ,  73  which overlap with each gear unit  54 ,  55  are provided at the disc detection members  45 ,  46 . The width measurement of the salient units  72 ,  73  is set to be sufficiently wider than the cog width of the gear units  54 ,  55 , and when a disc is not inserted, the recessed units  70 ,  71  and salient units  72 ,  73  can be mutually interlocked. 
         [0056]    These recessed units  70 ,  71  and salient units  72 ,  73  are used as a guide for alignment in order to easily attach both disc detection members  45 ,  46  and the partial gears  47 ,  48  to the second mounting unit  28  and the first mounting unit  29 . Further, because the load at the start is received by the salient units  72 ,  73 , in order to enhance the strength of the gear units  54 ,  55 , there is no need to go to the trouble of using an expensive material or increase the thickness of the cogs. 
         [0057]    The disc size determination mechanism  7  comprises a reciprocating member  74  which is the large disc detection means, a rotating member  75  which is the latching means, a locking member  76 , and a spring  77  for energizing in order to rotate the rotating member  75 . The disc size determination mechanism  7  is loaded at the lower surface side of the first mounting unit  29  at the left back location in the drawing of the disc detection mechanism  6 . 
         [0058]    The reciprocating member  74  is formed in a slender plate, and arranged so that the lengthwise direction is directed towards the disc insert/eject direction. The reciprocating member  74  at the front end has a long hole  78  which is at a right angle to the disc insert/eject direction, and the coupling pin  56  of the disc detection member  45  is engaged into the long hole  78 , and operates with rotation of the disc detection member  45 , and reciprocates in the disc insert/eject direction. Further, the reciprocating member  74  projects a cylindrical pin  79  upward in the vicinity of the rear end, and, on the rear surface, also has a thin wall  80  that extends the entire length in the lengthwise direction. The thin wall  80  regulates excessive bias in the left direction of the disc at the time of disc insertion and ejection. 
         [0059]    The rotating member  75  is attached on the lower surface of the first mounting unit  29  through a spindle  81  with the ability to rotate freely at the back location in the drawing of the reciprocating member  74 , and energized in the counterclockwise direction by the spring  77 . This rotating member  75  is also formed in a slender plate, and arranged so that the lengthwise direction is directed towards the disc insert/eject direction with a long opening in the lengthwise direction. Furthermore, the rotating member  75  provides a hook  82  at the front end, and further provides a first latching unit  83  for latching a large disc at the middle of the right surface, and a second latching unit  84  for latching a small disc at the front end of the right surface respectively. Moreover, in the opening described above, a cam surface  85  which inclines to increase the height from nearly the center towards the back is provided at the left side surface, and a third latching unit  86  for latching the pin  79  is also provided at the right side surface. 
         [0060]    The locking member  76  is axially supported with the ability to rotate freely at the lower surface of the first mounting unit  29 , and which has a pressed wall  87  which extends from the vicinity of the rotation axis to the front, and a cylinder  88  located at the furthest position from the rotation axis and to the left side of the rotation axis, and a space where the hook  82  of the rotating member  75  can enter appropriately is provided between the pressed wall  87  and the cylinder  88 . 
         [0061]      FIG. 6  is a top plane view showing the disc positioning mechanism  8  and the clamping mechanism  9 . As shown in  FIG. 6 , the disc positioning mechanism  8  comprises a pair of right and left stopper members  89 ,  90  which is the stopper means, a trigger member  91  which is the disc loading detection means, and an energizer spring, which is not illustrated, for energizing by rotating the right side stopper member  90  in the clockwise direction in the drawing. The disc positioning mechanism  8  is arranged at the back side of the clamp mechanism  9 . 
         [0062]    The pair of right and left stopper members  89 ,  90  constituting stopper means is mounted with the ability to rotate freely at the spindles respectively, in other words, at the lower surface side of the first mounting unit  29  through a rotating member attachment mechanism  247  which will be described hereafter. Both stopper members  89 ,  90  have spindles and concentric gear units  94 ,  95 , and which are composed so as to rotate by engaging those gear units  94 ,  95  in mutual synchronization. The gear units  94 ,  95  are thicker than other parts in order to increase the strength, and the thickened portion is shown within an arc hole  96  provided in the first mounting unit  29  (refer to  FIG. 1 ). Both stopper members  89 ,  90  provide stopper units  97 ,  98  constituting common stoppers enabled to contact with either a large disc D 1  or a small disc D 2  inserted. Both stopper units  97 ,  98  are formed in nearly a cylindrical shape projected downward and located in the disc feeding path. 
         [0063]    Further, each of the stopper members  89 ,  90  provide pressed units  99 ,  100  used for a large disc, pressed units  101 ,  102  used for a small disc, and elastic pieces  103 ,  104  respectively. Each elastic piece  101 ,  102  is crimped at all times at the lower surface of the first mounting unit  29 , and which prevents the generation of a rattle noise by the vibration of each of the stopper members  89 ,  90 . At the left side of the stopper member  89 , a first latch receiving unit  105  and a recess shaped second latch receiving unit  106  is further provided. In addition, the stopper members  89 ,  90  are energized in the direction having the stopper units  97 ,  98  coming closer to each other by the energized springs which are not illustrated. 
         [0064]    The trigger member  91  is nearly T shaped, and the lower end of the vertical piece thereof is mounted at nearly the center of the lower surface of the stopper member  90  through a spindle  107 . Further, one end of the horizontal piece of the T shape is a disc contact unit  108 , and a pressing unit  109  protruding downward is provided at the other end. 
         [0065]    The clamping mechanism  9  comprises a damper  110 , a damper releasing means  1   12  composed of a pair of linking mechanisms  111  arranged bilaterally-symmetric across the axial center line of the damper  110 , and a driving means  113 . 
         [0066]    The damper  110 , as shown in  FIG. 7 , comprises a damper member  114  made of a synthetic resin, a magnetic plate  115  which is the magnet yoke embedded in the turntable  13 , and a felt  116  applied to the upper surface of the magnetic plate  115 . 
         [0067]    The damper member  114  provides a flat surface unit  117  where the upper surface center is low for only that thickness of the magnetic plate  115 , a plurality of protrusions  118  arranged equiangularly in a circumferential direction at this flat surface unit  117 , and a center hole  119 . Further, the outer circumference surface is a taper surface  120  which becomes a proportionally narrower diameter as progressing downward (refer to  FIG. 25 ). 
         [0068]    Meanwhile, the magnetic plate  115  is nearly a triangle shape, and which has a semi-hit unit  121  which protrudes downward so as to engage with the center hole  119  of the damper member  114  and the small holes  122  which have the same number of protrusions  118 . Further, after the protrusions  118  of the damper member  114  are inserted into the small holes  122  respectively and placed on the flat surface unit  117 , the tip ends of the protrusions  118  are flattened and attached to the damper member  114 . In addition, the method for attaching the damper member  114  and the magnetic plate  115  is not limited to that described above, and a binding material may be used, or ultrasonic welding may be used. 
         [0069]    The felt  116  can be pasted on the upper surface of the semi-hit unit  121  directly if the adhesive sheet is pasted on the lower surface. The thickness of the felt  116  is set to be slightly higher than the upper surface of the damper  114  and the magnetic plate  115 . 
         [0070]    Each of the linking mechanisms  111  comprises a damper releasing member  123 , a front linking member  124 , and a rear linking member  125  as shown in  FIG. 8 . 
         [0071]    The releasing member  123  extends a pair of mutually parallel arms  127  from the salient surface side of a circular arc unit  126 , and the recessed surface side of the circular arc unit  126  is the taper surface  128  which becomes a proportionally narrower diameter as progressing downward. 
         [0072]    The front linking member  124  is constructed so that one end of a pair of legs  129  is coupled with the cylinder  130  and both legs  129  are mutually parallel; and the other end of each of the legs is mounted with the ability to rotate freely at the inner surface of each arm  127  and in the vicinity of the circular arc unit  126  through a metallic rotation or rotational axis  131 . Further, the rear linking member  125  is also constructed so that one of each end of a pair of legs  132  is coupled with the cylinder  133  and both legs  132  are mutually parallel; and the other end unit of each leg  132  is mounted with the ability to rotate freely at the inner surface of each arm  127  and the vicinity of the end unit through the metallic rotation axis  131 . The link span between the front linking member  124  and the rear linking member  125  are the same. In addition, the “link span” here indicates a space between the rotation axial line in relation to the upper frame  5  and the rotation axial line in relation to the releasing member of the front or rear linking member  124 ,  125 . The linking member  111  constituted in such manner is attached to the lower surface of the first mounting unit  29  through a nearly rectangular parallelepiped base  134  and a sheet metal  135  making a rectangular attachment plate. 
         [0073]    The base  134  has grooves  136 ,  137  which are parallel to each other at both ends of the upper surface, and a fixed axis  138  which is circumferentially segmented in four directions is provided in a protruded manner between both grooves  136 ,  137 . 
         [0074]    The sheet metal  135  is constituted so that the right and left edges are bent upwards once and bent horizontally outward along the way and making these as pressing units  139 ,  140 , and a large hole  141  is provided in the middle area. 
         [0075]    As shown in  FIG. 9 , after each of the cylinders  130 ,  133  of the front linking member  124  and rear linking member  125  are engaged in the grooves  136 ,  137  of the base  134  with the ability to revolve freely, the sheet metal  135  is superimposed on the upper surface of the base  134 , and then, the pressing units  139 ,  140  of the sheet metal  135  are laid on each of the cylinders  130 ,  133 . Subsequently, the fixed axis  138  of the base  134  is engaged into the attachment hole provided at the first mounting unit  29  through the large hole  141  of the sheet metal  135 , and the linking mechanism  11  is attached at the lower surface of the first mounting unit  29 . 
         [0076]    The driving means  113 , as shown in  FIG. 6 , is arranged between the damper releasing means  112  and the disc position mechanism  8 , and which comprises a pair of right and left transferring members  142 ,  143 , and a pair of right and left synchronizing gears  144 ,  145 . Both transferring members  142 ,  143  are slender, and the lengthwise direction is facing an orthogonal direction in relation to the disc insert/eject direction, while being arranged laterally symmetrical on the same straight line, and mounted at the lower surface of the first mounting unit  29  with the ability to transfer in the lengthwise direction. Further, the synchronizing gears  144 ,  145  are mounted on the lower surface of the first mounting unit  29  between both transferring members  142 ,  143 . 
         [0077]    Each of the transferring members  142 ,  143  has pressing pieces  146 ,  147  and racks  148 ,  149  in the vicinity of one end adjacent to each other, and each of the racks  148 ,  149  are engaged to the corresponding synchronizing gears  144 ,  145  respectively so as to move synchronizing in reverse direction from each other. And then, when both transferring members  142 ,  143  move in the separating direction, the pressed units  99 ,  100  used for a large disc or pressed units  101 ,  102  used for a small disc of the stopper members  89 ,  90  are pressed by the pressing pieces  146 ,  147  so that the left side stopper member  89  can rotate in the clockwise direction, and the right side stopper  90  can rotate in the counterclockwise direction in a synchronized motion. 
         [0078]    Further, in the vicinity of the other end of each of the transferring members  142 ,  143 , first pressing units  150 ,  151  which lower the releasing member  123  by pressing the leg  132  of each of the rear linking member  125  at the time of moving in the separating direction, and second pressing units  152 ,  153  which raise the releasing member  123  by pressing the leg  132  at the time of moving towards each other are provided. Furthermore, a pressing unit  154  is also provided at the left side transferring member  142 , for rotating the locking member  76  in the clockwise direction in  FIG. 6  by pressing the pressed wall  87  of the locking member  76  at the time of moving in the separating direction. Moreover, an engagement protrusion  155  is formed at the lower surface of the other end unit of the right transferring member  143 . 
         [0079]    The loading mechanism  10  comprises, as shown in  FIG. 10 , an activating means  156 , a power transfer mechanism  157 , a feeding means  158 , a detection means  159 , and the loading mortar  41 . 
         [0080]    The activating means  156  comprises a sliding member  160  arranged at the right back area of the lower surface of the first mounting unit  29 , and a guidance rack plate  161  arranged at the right center area of the lower surface of the first mounting unit  29 , and both of them have the ability to move in the disc insert/eject direction. 
         [0081]    The sliding member  160  is a thin plate made of synthetic resin, and the pressed unit  162  is formed at the lower surface side, and the pressed unit  162  slides in the disc eject direction pressed by the pressing unit  109  of the trigger member  91 . Further, a protruding unit  163  which protrudes downward is provided at the right edge in the drawing. 
         [0082]    The guidance rack plate  161  is a thin plate made of synthetic resin in the shape of a crank, and which has a rack  164  at the lower edge of the bottom portion within the drawing and a hook  165  near the center area (refer to  FIG. 12 ). When the sliding member  160  slides towards the disc eject direction, the top end in the drawing is pressed by the protruding unit  163  of the sliding member  160 , and moves in the same direction, and this makes the rack  164  engage with the power transfer mechanism  157 . 
         [0083]    The power transfer mechanism  157  is based on gear groups, and which comprises a lower gear group  44  mounted on the interior surface of the right side plate  24  of the lower frame  11 , an upper gear group  166  mounted on the interior surface side of the right panel  19  of the upper frame  5 , and a gear plate  167  (refer to  FIG. 11 ). Further, the lower gear group  44  is mounted in the back half of the right side plate  24  of the lower frame  11 , in other words, at the lower half of the side plate; and the upper gear group  166  is mounted at the front half of the right side plate  19  of the upper frame  5 , in other words, mounted at the upper half of the side plate directly or through the gear plate  167 . The lower half of the side panel and the upper half of the side panel are interlocked as shown in  FIG. 1 , and the lower gear group  44  and the upper gear group  166  are mesh connected. The feeding means  158  is driven by the loading motor  41  through the power transfer mechanism  157 . 
         [0084]    The lower gear group  44  comprises a first gear  168 , a second gear  169 , and a third gear  170  which are all axially supported at the interior surface of the right side plate  24  of the lower frame  11 . These are all two-step gears, and the first gear  168  is engaged with the worm gear  43  by having the large gear of the first step as the helical gear. A large gear which is the first step of the second gear  169  is engaged to a small gear which is the second step of the first gear  168 , and a large gear which is the first step of the third gear  170  is engaged with a small gear which is the second step of the second gear  169 , so that the rotation of the loading motor  41  can be slowed in stages. 
         [0085]    The upper gear group  166 , as shown in  FIG. 11 , comprises a fourth gear  171 , a fifth gear  172 , a sixth gear  173 , and a seventh gear  174  which are all two-step gears. The fourth gear  171  and the fifth gear  172  are axially supported directly in the interior surface of the right side plate  19 ; however the seventh gear  174  together with the gear plate  167  are axially supported in the interior surface of the right side plate  19  through the mutual spindle  175 ; and sixth gear  173  is axially supported at the gear plate  167 , and the large gear which is the second step is engaged at all times with the small gear which is the first step of the seventh gear  174 . The large gear which is the first step of the fourth gear  171  is engaged with the small gear which is the second step of the fourth gear  171  so that the rotation of the third gear  170  can be further slowed in stages and transferred to the fifth gear  172 . The small gear which is the first step of the sixth gear  173  has the ability to detach in relation to the large gear which is the first step of the fifth gear  174 , so that the rotation of the fifth gear  172  can be transferred to the seventh gear  174  by increasing the speed at the sixth gear  173  at this time. Further, the worm gear  43  loaded on the loading motor  41 , first gear  168 , second gear  169 , third gear  170 , fourth gear  171 , and fifth gear  172  constitute an operation means. 
         [0086]    The gear plate  167  is a metallic plate, and the right end in  FIG. 11  is bent inward making a slide contact receiving unit  176 , and an engaging pin  177  is provided near the center in the drawing. The gear plate  167 , the engaging pin  177 , and the sixth gear  173  which is axially supported to the gear plate  167 , constitute a clutch means which suitably interrupts the power transfer path between the operation means and a roller  178 . 
         [0087]    The feeding means  158 , as shown in  FIG. 12 , comprises the roller  178 , a roller supporter  179 , a slider  180  to control the roller position, a cam plate  181 , and the disc guide  32 . 
         [0088]    The roller  178  is constituted by inserting a metallic roller axis  1   84  into a pair of taper cylinders  182 ,  183  made of synthetic rubber which gradually becomes smaller in size from the outer end to the inner end. Both ends of the axis  184  protrude from the outer end of the taper cylinders  182 ,  183 , and a small collar  185  is attached at one end of the protruding axis  184 , and a large collar  186  and a roller gear  187  are attached at the other end. The cog width of the roller gear  187  is about  2  mm, and at the outer surface of the cogs, a cylindrical collar  188  is placed. 
         [0089]    The roller supporter  179  is made of a metallic plate, and has right and left side panels  190  which are formed by bending upward at the right and left ends of a flat plate  189  which is laterally long, and these right and left side panels extend from the flat plate  189  to the back. The right and left side panels  190  have a shaft hole  191  at nearly the middle area respectively, and each shaft hole  191  is inter-fit into the axis not illustrated that protrudes to the interior surfaces of the right and left side panels  18 ,  19  on the frame  5 , and is mounted with the ability to rotate freely vertically between both side panels  18 ,  19 . Further, the small collar  185  and the large collar  186  are supported respectively by the extended portion of the right and left side panels  190 , and the roller  178  is supported with the ability to rotate freely. The rear edge of the flat plate  189  is a mountain fold edge  192  which is bent towards the reverse surface. This mountain fold edge  192  is also a V shape recess which is nearly bilaterally symmetric in the drawing of the flat plate; however the inclined angle is about 1 degree which is very slight in relation to the shaft center line of the roller. Furthermore, a pair of right and left curved units  193 , which are bent upward, is provided at the front edge of the flat plate  189 . When the roller  178  is placed at the lower side, in other words, the disc is inserted into the playback position, these curved units  193  are placed at the upper side to plug the disc insertion port  2  and prevent a double disc insertion. In addition, the roller supporter  179  is energized at all times in the direction where the roller  1   78  is raised by the spring which is not illustrated. 
         [0090]    As shown in  FIG. 12 , the slider  180  is a slender form and is mounted on the lower surface of the first mounting unit  29  by directing the lengthwise direction to the disc insert/eject direction with the ability to move in the disc insert/eject direction. This slider  180  has a sliding contact unit  194  at the front end in the drawing with a protruding unit at the rear side, and has an inclined surface  195  constituting a protruding cam as the roller separation unit where the front edge inclines downward as progressing to the rear side, and a cam groove  196  as the power interruption unit at the further rear side on the right side surface. The engaging pin  177  of the gear plate  167  is inserted into the cam groove  196 . At the further rear side of the cam groove  196 , a rack unit  197  is provided; and at the left side unit of the rear end in the drawing, an engaging unit  198  which protrudes downward is provided. The rack unit  197  selectively engages with a small gear which is the second step of the fifth gear  172 . In addition, the cam groove  196  is provided in the slider  180 , and the engaging pin  177  is provided on the gear plate  167  with the present Embodiment; however, it is not limited to that described above, and the pin may be provided in the slider and the cam groove may be on the plate. 
         [0091]    The cam plate  181  is mounted on the lower surface of the first mounting unit  29 , and a cam groove  199  is provided at the front half in the drawing. The cam groove  199  is formed to extend in the disc insert/eject direction, and the middle area is made to be an inclined unit which inclines to the right side as it progresses to the rear, and the engaging protrusion  155  of the transferring member  143  is inserted into the cam groove  199 . The front right side wall of the cam groove  199  is composed of an elastic piece  200  which extends to the front side in the drawing, and a stopper  201  is provided at the tip of the elastic piece  200 . Further, in the deepest area in the drawing, a prismatic shaped second switch pressing unit  202  protrudes downward. Furthermore, at the right side of the front end of the cam plate  181  in the drawing, a hole which is not illustrated is provided for inserting the engaging unit  198  of the slider  180  so that the cam plate  181  can move integrally with the slider  180 . Moreover, a spring which is not illustrated is attached in the space with the guidance rack plate  161  so that the cam plate  181  can follow when the guidance rack plate  161  is moved by the spring energizing force. In addition, the cam plate  181  stably maintains a termination location before and after movement by a reversal spring which is not illustrated. 
         [0092]    The disc guide  32  comprises the second mounting unit  28  of the upper frame  5  and four guiding projections  203  (only one of them is illustrated). 
         [0093]    Each guiding projection  203  is attached at the lower surface of the second mounting unit  28  where the lengthwise direction is orthogonal to the disc insert/eject direction and mutually paired laterally by positioning at the near side and far side of the roller  178 . 
         [0094]    A bulging unit  204  where the front half of the rectangular region of the center is bulged downward, is provided in the second mounting unit  28 , and a plurality of positioning holes  205  are provided at the right and left thereof in order to mount each guiding projection  203  respectively. The positioning holes  205  are formed by connecting a small circular hole  206  and a large circular hole  207 , and the large circular hole  207  side is directed towards the bulging unit  204 . 
         [0095]    Each of the guiding projections  203  having the large heads provides engaging protrusions  208  in the same number as each of the positioning holes  205 . A surface (lower surface) that contacts with the disc of each guiding projection  203  is inclined so as to incline upward as it progresses to the center area from the lateral end of the mounting unit  28  (moving away from the shaft center line of the roller  178 ) in a mounted state to the lower surface of the second mounting unit  28 . In addition, each of the guiding projections  203  are composed of synthetic resins and all of them are identical forms and sizes. 
         [0096]    In the attaching of each of the guiding projections  203 , first, a plurality of engaging protrusions  208  are inserted through from the large circular holes  207  side of each of the positioning holes  205 . And then, when the engaging protrusions  208  are moved to the small circular hole  206  side by sliding the guiding protrusions  203  outward while pressing against the lower surface of the second mounting unit  28 , the large size heads of the engaging protrusions  208  move to the small circular hole  206  side, the engaging protrusions  208  are prohibited from slipping out from the positioning holes  205 , and the guiding projections  203  are mounted on the lower surface of the second mounting unit  28 . 
         [0097]    The detection means  159 , as shown in  FIG. 13 , comprises a position detection member  209  and an actuator  210  which are arranged at the front right side in  FIG. 10 . 
         [0098]    The position detection member  209 , as shown in  FIG. 13 , is arranged on the lower surface side of the first mounting unit  29  while the lengthwise direction is directed to the disc insert/eject direction, and which has a wall which protrudes upward in the left side area in the drawing of a prismatic shaped body  211 , and a coupling piece  213  having a long hole  212  extending to the left side is provided at the top surface of the wall. The body  211  provides a first switch pressing unit  214  to press the first switch  35 , a third switch pressing unit  215  to press the third switch  37 , and a fourth switch pressing unit  216  to press the fourth switch  38  which are arranged at the circuit substrate  16 . The position detection member  209  is mounted on the lower surface of the slider  180  with the ability to freely move in the disc insert/eject direction, and which inserts the coupling pin  57  of the disc detection member  46  into the long hole  212  and moves in the disc insert/eject direction by interlocking with the rotation of the disc detection member  46 . 
         [0099]    The actuator  210  has a spindle hole  217  at the front side in the drawing and is axially supported at the right side panel  19  of the upper frame  5  with the ability to rotate freely by inserting the supporting axis (indicated by the virtual line) of the roller supporter  179  to this hole  217 . A fifth switch pressing unit  218  is formed at the back side in the drawing to press the fifth switch  39  (refer to  FIG. 4 ). Further, a vertically long loop unit  219  is provided at the front side of the switch pressing unit  218  in the drawing. Within this loop unit  219 , the collar  188  of the roller  178  is inserted. In order for the actuator  210  to share the supporting axis with the roller supporter  179 , the spindle hole  217  needs to be located more to the front side than the roller  178 ; and because the fifth switch pressing unit  218  also needs to be located more to the back side than the roller  178  in order to press the fifth switch  39  located further to the back than the roller  178 , the loop unit  219  which shows the collar  188  arranged at the roller axis  184  is provided so that the actuator  210  does not interfere with the roller axis  184 . Further, a torsion spring which is not illustrated is hung between the roller supporter  179  and the actuator  210 , and when the roller supporter  179  starts rotating by inserting a disc, the actuator  210  also follows and starts rotating so that the fifth switch  39  is pressed by the fifth switch press unit  218 . 
         [0100]    As shown in  FIG. 4 , the pickup unit  15  comprises a turntable  13  having a built-in magnet, a pickup  14  to playback or record the disc, a feed motor means  220  to drive the pickup  14 , a pickup support means  221  to support the pickup  14 , and a pickup chassis  222  for carrying these. 
         [0101]    The pickup chassis  222  made of a metallic plate has a large opening  223  at the center, and the turntable  13 , pickup  14 , and the feed motor means  220  are arranged together to the inside of the large opening  223 . At the three locations around the chassis  222 , a damper attachment  224  is provided in which a portion is opened and is formed by stepped bend processing. 
         [0102]    The turntable  13  is attached to the right lower area of the pickup chassis  222  in the drawing, and the center of the turntable  13  becomes nearly the center of the mechanism unit  1  of the disc player. The pickup  14  is arranged within the large opening  223  with the ability to reciprocate between the vicinity of the turntable  13  and the upper area of the pickup chassis  222  diagonally in the drawing. This pickup  14  is attached to the pickup chassis  222  through the pickup support means  221 . 
         [0103]    The feed motor means  220  comprises a feed motor  227  providing a feed screw  226  having spiral grooves, and a motor support plate  228  to support those. The motor support plate  228  fixes the feed motor  227  at one end, and supports the tip of the feed screw  226  at the other end with the ability to revolve freely; and the feed screw  226  is attached on the rear side of the pickup chassis  222  accommodating the moving direction of the pickup  14 . 
         [0104]    The pickup support means  221  comprises a main-guide  229  and a sub-guide  230  arranged so as to be parallel to each other, a main-guide tracking adjustment means  231  and a sub-guide tracking adjustment means  232 , and a pickup feed plate  233 . Because the location of one end of the main-guide  229  is fixed on the lower surface side of the pickup chassis  222 , the main-guide tracking adjustment means  231  exclusively adjusts the tracking by only the other end of the main-guide  229 . 
         [0105]    The main-guide tracking adjustment means  231 , as shown in  FIG. 14 , comprises a coil spring  234  to energize the main-guide  229  in the tracking direction at a uniform elastic force, an adjusting plate  235  made of a blade spring to receive the elastic force of the spring  234  by the opposite side of the main-guide  229  to regulate the tracking direction movement of the main-guide  229 , and a main-guide adjust screw  237  which is screwed into the rear surface of the pickup chassis  222  via a through hole  236  (refer to  FIG. 15 ) provided at a portion of the adjusting plate  235 . 
         [0106]    The adjusting plate  235  has a three-staged flat surface which includes, in order from the top of the drawing, an upper stage  238 , a middle stage  239 , and a lower stage  240 . The upper stage  238  is fixed to the lower surface side of the pickup chassis  222 , and the lower stage  240  is attached to the main-guide  229  from the lower side so that the main-guide  229  can be supported. As shown in  FIG. 15 , the middle stage  239  has a hole  241  resembling a U shape for providing flexibility to the area connected with the upper stage  238 , and further has the through hole  236  at in an area near to the lower stage  240 . 
         [0107]    Adjustment of the main-guide  229  in the tracking direction is performed by moving the main-guide  229  in the vertical direction in  FIG. 14  through fastening/loosening of the main-guide adjust screw  237 . 
         [0108]    The sub-guide tracking adjustment means  232 , as shown in  FIG. 16 , comprises a pair of right and left sub-guide supporting plates  242  to support both ends of the sub-guide  230 , a pair of right and left compressed springs  243  arranged at both ends of the sub-guide  230 , a pair of right and left sub-guide adjust screws  244  screwed into the rear surface side of the pickup chassis  222  by passing through the hole provided at the sub-guide supporting plate  242 . 
         [0109]    One end of both sub-guide supporting plates  242  is bent upward respectively in the drawing, and the tip of the sub-guide  230  is fit together and supported by insertion into the hole provided at the bending member. Further, the adjust screw  244  is inserted through the compressed spring  243  between the pickup chassis  222  and the sub-guide supporting plate  242 . 
         [0110]    The adjustment of the sub-guide  230  in the tracking direction is performed by moving the sub-guide  230  vertically by fastening/loosening each of the sub-guide adjust screws  244 . 
         [0111]    Further, with the pickup feed plate  233 , as shown in  FIG. 4 , one end is fixed at the pickup  14 , and a screw head  246  formed by cut-bending is provided at the other end, and then the screw head  246  is engaged in the spiral groove of the feed screw  226 . By so doing, the power of the feed motor  227  is transferred to the pickup feed plate  233  from the feed screw  226 , and the pickup  14  is driven by the power of the feed motor  227 . 
         [0112]    A rotating member attachment mechanism  247  comprises a supporting member  248  and a fixing member  249  as shown in  FIG. 17 . Both the supporting member  248  and the fixing member  249  are formed of synthetic resin. 
         [0113]    The supporting member comprises a circular shaped plate  250 , a support cylinder  251 , and a fixing tube  252  as shown in  FIG. 18 . The support cylinder  251  protrudes on one surface of the circular shaped plate  250  and on the same axis with a circular center hole  253  of the circular shaped plate  250 ; and the fixing tube  252  which protrudes longer than the support cylinder  251  on one surface of the circular shaped plate  250  by connecting to the circular center hole  253 . The fixing tube  252  has a taper surface  254  at the inner circumference of the top end which reduces in size to a smaller diameter towards the top end, and which also is circumferentially segmented in four directions. The taper surface  254  is formed further to the front of the inner circumference than the top end of the support cylinder  251 . 
         [0114]    The fixing member  249 , as shown in  FIG. 19 , comprises a pressing unit  255  and an end plate  256  provided at the rear anchor of the pressing unit  255 . The pressing unit  255  forms a cylindrical shape, and the top rim is a tapered slide contact rim  257  which is inserted into the fixing tube unit  252  through the circular center hole  253  of the circular shaped plate  250 . 
         [0115]    The spindles  50 ,  51 ,  62 ,  63  in  FIG. 5  and the spindle  107  in  FIG. 6  may also mount both disc detection members  45 ,  46 , both partial gears  47 ,  48 , and both stopper members  89 ,  90  to the first mounting unit  29  as shown in  FIG. 3  by the rotating member attachment mechanism  247 . Likewise, the trigger member  91  may be mounted to the second mounting unit  28 . 
         [0116]      FIG. 17  shows an example of the attachment method of the rotating components by the rotating member attachment mechanism  247  to describe how the stopper member  89  is mounted to the first mounting unit  29  of the upper frame  5 . As shown in  FIG. 17 , first, the support cylinder  251  is engaged to the hole provided in the stopper member  89 . Next, the portion longer than the support cylinder  251  of the fixing tube  252  is engaged to a circular fixing hole  258  provided in the first mounting unit  29 . When the pressing unit  255  of the fixing member  249  is engaged into the fixing tube  252  while the slide contact rim  257  of the pressing unit  255  contacts with the taper surface  254  of the fixing tube unit  252 , and in that state the fixing member  249  is compressed until the end plate  256  is attached to the circular shaped plate  250 , the taper surface  254  is pressed by the slide contact rim  257 , and the top end of the fixing tube unit  252  slightly rolls back outward. By so doing, the top end of the fixing tube  252  is extended outward further than the circular fixing hole  258  of the first mounting unit  29 , and the supporting member  248  is fixed tightly to the first mounting unit  29 , and the stopper member  89  is mounted with the ability to freely rotate in relation to the first mounting unit  29 . 
         [0117]    An operation of the mechanism unit  1  of the disc player is described hereafter. 
         [0118]    First, a description will be given of the operation until a disc inserted from the disc insertion port  2  is loaded into the playback position. 
         [0119]      FIG. 20  shows the state in which a large disc D 1  or a small disc D 2  is inserted from the disc insertion port  2  between the detection units  52 ,  53  of the disc detection member  45 ,  46  and the circumference of the disc makes contact with both detection units  52 ,  53 . From this state, as shown in  FIG. 21 , when the disc is inserted while expanding the interval between the detection units  52 ,  53  by pushing the disc, the disc detection members  45 ,  46  start rotating. The disc detection member  45  of the left side is connected to the reciprocating member  74 , and the disc detection member  46  of the right side is connected to the position detection member  209 , so if both disc detection members  45 ,  46  rotate in a direction which causes the corresponding detection units  52 ,  53  to separate, then the reciprocating member  74  and the position detection member  209  move to the disc insert=direction. 
         [0120]    When the position detection member  209  moves to the disc insert direction, first, the fourth switch pressing unit  216  of the member  209  presses the fourth switch  38  to turn on. When the position detection member  209  further moves to the disc insert direction, the first switch pressing unit  214  of the member  209  presses the first switch  35  to turn on, and the motor  41  is activated by detecting the disc insertion. 
         [0121]    The rotation of the motor  41  is transferred to roller  178  through the power transfer mechanism  157 , and the roller  178  starts rotating in the clockwise direction in  FIG. 12 . When the disc is inserted between the roller  178  and the guide projection  203  (refer to  FIG. 12 ) of the disc guide  32 , the roller  178  is pushed downward by the disc, and the roller supporter  179  barely rotates in the clockwise direction in  FIG. 12  centering around the shaft hole  191 . While the roller  178  is pressed downward, the actuator  210  also rotates in the clockwise direction in  FIG. 13  by the energizing force of the spring not illustrated which is placed through the space with the actuator  210 , the fifth switch pressing unit  218  presses the fifth switch  39 . By so doing, the fifth switch  39  turns on and the insertion of the disc is detected. The disc is clamped by the roller  178  and the disc guide  32  and fed by the rotation of the roller  178 . 
         [0122]      FIG. 22  shows the state in which a large disc D 1  or small disc D 2  is fed by the roller  178 , and the center of the disc arrives between both detection units  52 ,  53 . First, when a small disc D 2  is inserted, even if the center of the small disc D 2  arrives between both detection units  52 ,  53 , the pin  79  will not reach to the cam surface  85  of the rotating member  75  because the rotation amounts of both disc detection members  45 ,  46  are small and the moving amounts of the reciprocating member  74  are also small. Further, because the displacement of the position detection member  209  is also small, the third switch pressing unit  215  does not move to the position of the third switch  37 , so the third switch  37  maintains the off state. Meanwhile, when a large disc D 1  is inserted, both disc detection members  45 ,  46  rotate in large measure before the center of the large disc D 1  arrives between both detection units  52 ,  53 . Therefore, the reciprocating member  74  moves a large amount, and the pin  79  slides and makes contacts with the cam surface  85  of the rotating member  75  causing the member  75  to rotate in the clockwise direction in the drawing. Further, the displacement of the position detection member  209  is also large, and the third switch  37  turns on by the third switch pressing unit  215 . 
         [0123]    When feeding of a disc further proceeds from the state of  FIG. 22 , when a small disc D 2  is inserted, both disc detection members  45 , 46  recover to the initial position prior to insertion of the disc while the detection members  45 ,  46  slide and make contact with the circumference surface of the small disc D 2  due to the energizing force of the coil spring  49 . The circumference surface of the small disc D 2  makes contact with the disc contact unit  108  of the trigger member  91  causing the trigger member  91  to rotate in the clockwise direction. By this rotation, the pressing unit  109  of the trigger member  91  presses the pressed unit  162  of the slide member  160  causing the slide member  160  to move in the disc eject direction. Further, as shown in  FIG. 23 , the small disc D 2  slightly pushes the disc contact unit  108  causing the circumference surface to make contact with each of the stopper units  97 ,  98  of both stopper members  89 ,  90 . At this time, the left side stopper member  89  latches the first latch receiving unit  105  to the second latching unit  84  of the rotating member  75 , so the left side stopper member  89  is prohibited from turning in the clockwise direction and the right side stopper member  90  is prohibited from turning in the counterclockwise direction, and the small disc D 2  is fed slightly farther in than the preset loading position until contacting with both stopper units  97 ,  98  and stops. 
         [0124]    On the other hand, when a large disc D 1  is inserted, the feeding process continues from the state in  FIG. 22  until the circumference surface makes contact with each of the stopper members  97 ,  98 , and because the rotating member  75  rotates in the clockwise direction in the drawing as the cam surface  85  thereof is pressed by the pin  79  of the reciprocating member  74 , the first latch receiving unit  105  of the stopper member  89  is not latched to the second latching unit  84 , and the stopper units  97 ,  98  of both stopper members  89 ,  90  rotate in a direction to mutually separate by being pressed by the circumference surface of the large disc D 1 . Further, the large disc D 1  pushes both stopper units  97 ,  98  by the circumference surface, and at the same time also pushes the disc contact unit  108  of the trigger member  91  causing the trigger member  91  to rotate in the clockwise direction in relation to the stopper member  90 . By so doing, the pressing unit  109  of the trigger member  91  presses the pressed unit  162  of the sliding member  160  causing the sliding member  160  to move in the disc eject direction. 
         [0125]    As feeding of the large disc D 1  further progresses, as shown in  FIG. 23 , the left side stopper member  89  is latched to the first latching unit  83  of the rotating member  75  of the second latch receiving unit  106  of the left side stopper member  89 . Accordingly, both stopper members  89 ,  90  are prohibited from further rotation, and the large disc D 1  contacts both stopper units  97 ,  98  and stops when the disc D 1  is fed to the preset loading position. In this process, both disc detection members  45 ,  46  only slightly return with the reciprocating member  74  while sliding and contacting the detection members  45 ,  46  to the circumference surface of the large disc D 1  by the energizing force of the coil spring  49 ; however, both disc detection members  45 ,  46  are prohibited from returning thereafter together with the reciprocating member  74  because the pin  79  of the reciprocating member  74  is latched to the third latching unit  86  of the rotating member  75 . 
         [0126]    Moreover, even in the case where either a large disc D 1  or a small disc D 2  is inserted, when the sliding member  160  is moved in the disc eject direction pressed by the trigger member  91 , the guidance rack plate  161  together with the sliding member  160  moves to the disc eject direction, as shown in  FIG. 11  and  FIG. 12 , and the rack  164  of the guidance rack plate  161  is engaged with the small gear of the fifth gear  172 . At this time, the fifth gear  172  is already rotating receiving the driving force of the motor  41 , so the guidance rack plate  161  moves to the disc eject direction by the driving force of the motor  41 . Then, the cam plate  181  follows by the energizing force of the spring not illustrated hung across the guidance rack plate  161  and the cam plate  181 , and the slider  180  which moves integrally with the cam plate  181  moves to engage the rack unit  197  with the small gear of the fifth gear  172 . In this manner, the slider  180  moves in the disc eject direction by the power of the motor  41 . 
         [0127]    The engaging pin  177  of the gear plate  167  is inserted to the cam groove  196  of the slider  180 ; therefore, the engaging pin  177  moves with the cam groove  196  by the movement of the slider  180 . Then, the gear plate  167  rotates in the counterclockwise direction centering the spindle  175  as shown with the virtual line in  FIG. 11 , and the sixth gear  173  supported axially by the gear plate  167  separates from the fifth gear  172 . In this way, the power transfer path from the motor  41  throughout the roller  178  is interrupted and the rotation of the roller  178  stops. In other words, when a disc contacts both stopper units  97 ,  98 , the rotation of the roller  178  stops immediately; therefore, there is no useless rotation while the roller  178  is in contact with the disc, and there is no fear of damaging the data recording surface of the disc by the rotation of the roller  178 . 
         [0128]    Meanwhile, because the driving force of the motor  41  continues to be transferred to the fifth gear  172 ; the slider  180  engaged with the fifth gear  172  moves further to the disc eject direction causing the clutch means to switch to the interruption side. In other words, the roller  178  is separated from the disc (refer to  FIG. 12 ) contacting the inclined surface  195  of the slider  180  to the large collar  186  of the roller  178 . At this time, the roller supporter  179  rotates in the clockwise direction in the drawing centering the shaft hole  191  while opposing the energizing force of the spring not illustrated which is hung across between the actuator  210 . 
         [0129]    When the slider  180  moves to the disc eject direction, the cam plate  181  also moves integrally; however, as shown in  FIG. 6 , before the cam plate  181  moves, the engaging protrusion  155  of the right side transferring member  143  is located at the foremost position in the drawing within the cam groove  199  of the cam plate  181 . From this state, when the cam plate  181  moves to the disc eject direction, the engaging protrusion  155  moves to the furthermost area along the cam groove  199  as shown in  FIG. 24 , and thereby, the right side transferring member  143  moves to the right side in the drawing, and the left side transferring member  142  moves synchronously to the left side. As described above, when the right and left transferring members  142 ,  143  are separated from each other, the releasing member  123  is lowered by pressing the legs  132  of the right and left linking mechanisms  111  by each of the first pressing units  150 ,  151  respectively. 
         [0130]      FIG. 25  shows the state when releasing the damper member  114  from the turntable  13  while clamping the circumference area of the damper member  114  by the taper surface  128  of the right and left releasing members  123  (the prior state of the cam plate  181  movement). From this state, when the right and left transferring members  142 ,  143  move in a direction to separate from each other, as shown in  FIG. 26 , the first pressing units  150 ,  151  of the transferring members  142 ,  143  press the leg  132  of the rear linking member  125 , and the rear linking member  125  rotates along with the front linking member  124  centering the cylinder  133 , and the right and left taper surfaces  128  move downward to the right and left while forming a circular trajectory. Accordingly, these taper surfaces  128  draw apart to the right and left while lowering the damper member  114 . When the damper member  114  moves close enough to the turntable  13  standing-by at the lower side of the damper member  114 , the taper surfaces  128  separate from the damper member  114  and move to a position to clamp the disc in cooperation with the turntable  13 ; and the disc is clamped by the magnetic force between the damper  110  and the turntable  13 . At this time, if a small disc D 2  is loaded, the disc is returned to the designated loading position by the taper surface of the damper member  114 , and separated from the stopper units  97 ,  98 . 
         [0131]    Meanwhile, at the final stage of right and left movement, after the wall surfaces of the pressed units  99 ,  100  used for a large disc of the stopper members  89 ,  90  are pressed by the pressing pieces  146 ,  147  and the disc is clamped with the damper  110  and the turntable  13 , both transferring members  142 ,  143 , as shown in  FIG. 24 , separate the stopper units  97 ,  98  from the disc by slightly rotating the stopper units  97 ,  98  of both stopper members  89 ,  90  in the direction to separate from each other.  FIG. 24  shows the state when a large disc D 1  is inserted; however, when a small disc D 2  is inserted, the wall surfaces of the pressed units  101 ,  102  used for a small disc of the stopper members  89 ,  90  are pressed, and then the stopper units  97 ,  98  are separated from the circumference surface of the disc. 
         [0132]    Further, at the final stage where the cam plate  181  moves to the disc eject direction, when the second switch pressing unit  202  of the cam plate  181  detects the completion of disc insertion by turning on the second switch  36 , the loading motor  41  stops. In this manner, the disc is arranged in the playback position and the loading of the disc is complete. 
         [0133]    The relationships between the insertion of a large disc D 1 , small disc D 2  and the turning on and off of the first switch  35  through fifth switch  39  are shown in the following table, and by turning each switch on and off, a determination is made whether the inserted disc is a large disc D 1  or a small disc D 2 . 
         [0000]    
       
         
               
               
               
             
               
               
               
               
             
           
               
                   
                   
               
               
                   
                 Large Disc D1 
                 Small Disc D2 
               
               
                   
                   
               
             
             
               
                   
               
             
          
           
               
                   
                 First switch 16a 
                 ON 
                 OFF 
               
               
                   
                 Second switch 16b 
                 ON 
                 ON 
               
               
                   
                 Third switch 16c 
                 ON 
                 OFF 
               
               
                   
                 Fourth switch 16d 
                 ON 
                 OFF 
               
               
                   
                 Fifth switch 16e 
                 ON 
                 ON 
               
               
                   
                   
               
             
          
         
       
     
         [0134]    Incidentally, when a disc is not inserted, the first switch  35  through the fifth switch  39  are all turned off. 
         [0135]    Next, a description will be given hereafter of the operation to discharge to a position where a disc located in the playback position can be retrievable from the disc insertion port  2 . 
         [0136]      FIG. 24  shows the state where a large disc D 1  is arranged at the playback position, and when the eject button not illustrated is pressed while in such condition, the loading motor  41  activates. By this activation, the slider  180  (refer to  FIG. 12 ) through the power transfer mechanism  157  starts moving to the disc insert direction. By so doing, the cam plate  181  moves with the slider  180 , thereby separating the second switch pressing unit  202  from the second switch  36  and turning off the second switch  36 . 
         [0137]    When the slider  180  moves further in the disc insert direction, the engaging protrusion  155  of the transferring member  143  arrives at the front inclined surface from the furthermost area of the cam groove  199  of the cam plate  181 . In this manner, the right side transferring member  143  returns to the left side, and the left side transferring member  142  returns to the right side, and the state changes from that in  FIG. 24  to  FIG. 23 . 
         [0138]    At this time, the first pressing unit  150 ,  151  of each of the transferring members  142 ,  143  separate from the leg  132  of the linking mechanism  111 ; however, the second pressing unit  152  presses the leg  132  inward from the outside instead, and the rear linking member  125  rotates with the front linking member  124  centering the cylinder  133 , and the right and left taper surfaces  128  move upward to the right and left while forming a circular trajectory. At this time, the right and left taper surfaces  128  scoops up the circumference edge of the damper member  114 , and the damper  110  releases the turntable  13 . 
         [0139]    Meanwhile, the stopper members  89 ,  90  pressed by the pressing pieces  146 ,  147  of each of the transferring members  142 ,  143  are released allowing the return of both stopper units  97 ,  98  rotating in the direction to be closer to each other by the energized spring not illustrated. Further, the stopper units  97 ,  98  push the exterior of the large disc D 1 , and the large disc D 1  is pushed out to the disc eject direction. At that time, the trigger member  91  also rotates in the counterclockwise direction together with the stopper member  90  and pushes out to a position where the large disc D 1  is retrievable from the disc insertion port  2 . 
         [0140]    When the slider  180  further moves to the disc insert direction, the large collar  186  heretofore pressed by the inclined surface  195  of the slider  180  rises when the pressure exerted by the inclined surface  195  is released causing the roller  178  to make contact with the disc (refer to  FIG. 12 ). At that time, the roller supporter  179  rotates in the counterclockwise direction in the drawing. 
         [0141]    At the final stage in which the slider  180  moves in the disc insert direction, the engaging pin  177  of the gear plate  167  which engages with the cam groove  196  arrives at the cam surface as shown in  FIG. 11 , and the gear plate  167  rotates in the clockwise direction centering the spindle  175 . By so doing, the sixth gear  173  axially supported in the gear plate  167  engages with the fifth gear  172 , and the driving force of the loading motor  41  is transferred even to the roller  178  initiating rotation in the disc eject direction of the roller  178 . And then, the large disc D 1  is discharged by the rotation of the roller  178 . 
         [0142]    When the large disc D 1  is discharged by the roller  178 , both stopper members  89 ,  90  return to their initial positions prior to disc insertion shown in  FIG. 22 ; and both detection units  52 ,  53  follow the circumference surface of the large disc D 1  as both disc detection members  45 ,  46  rotate to discharge further. At that time, when the center of the large disc D 1  moves beyond both detection units  52 ,  53 , both disc detection members  45 ,  46  rotate in the direction to become closer to each other. 
         [0143]    By the rotation of both of these disc detection members  45 ,  46 , the reciprocating member  74  moves to the disc eject direction, and the rotating member  75  rotates in the counterclockwise direction by the energizing force of the spring  77  along the pin  79  of the reciprocating member  74 . At that time, the stopper member  89  is returned to its initial position, so the rotating member  75  can rotate without being restricted by the stopper member  89 . 
         [0144]    When the third switch pressing unit  215  of the position detection member  209  which is linked with the disc detection member  46  is removed from the third switch  37  as shown in  FIG. 21 , the third switch  37  is turned off thereby detecting the completion of the discharge of the large disc D 1  and stopping the motor  41 . In the case of discharging a small disc D 2 , when the fourth switch pressing unit  216  of the member  209  separates from the fourth switch  38  thereby detecting the completion of the disc discharge and stopping the motor  41 . 
         [0145]    In addition, the taper surface  120  is used for the damper member  114 , and the taper surface  128  is used for the releasing member  123  respectively with the present Embodiment; however, it is not be limited to these, and the component force to release the damper member  114  from the turntable  13  can be obtained by the releasing member  123  even if a taper surface (inclined surface) is provided only to at least one of either the damper member  114  or releasing member  123 . 
         [0146]    Further, the linkage span is the same with the front linking member  124  and the rear linking member  125  with the present Embodiment; however, it is not limited to this, and an incline occurs with the releasing member in relation to the damper even if the linkage span of the rear linking member  125  is slightly longer than the linkage span of the front linking member  124 ; therefore, the detachment force of the damper in accompany with the rotation of the front linking member  124  and the rear linking member  125  can be greatly enhanced.