JP4272652B2 - Disk mis-insertion prevention mechanism - Google Patents

Description

  The present invention relates to a disc device capable of reproducing and / or recording information on a disc such as a CD or a DVD, and more particularly, a slot-in disc in which a disc is inserted / extracted from an insertion port provided on a front plate. The present invention relates to a mechanism for preventing erroneous insertion of a disk provided in the apparatus.

  Conventionally, a slit-shaped insertion opening is provided in a front plate of a casing constituting an outer shell of a disk device, and a shutter member that can be rotated along the outer surface is provided on the front plate. An erroneous insertion prevention mechanism is known in which an insertion slot is closed with a shutter member when loaded in the apparatus, thereby avoiding insertion of another disk in the apparatus (for example, Patent Documents). 1). The shutter member includes a pair of rotating arms that are gear-coupled so as to rotate synchronously in opposite directions, and these rotating arms are urged in the closing direction by the spring force of the spring. In addition, a leaf spring whose tip side is elastically contacted with the outer surface of the front plate is attached to one of the rotary arms in a cantilevered manner, and the front plate protrudes within the rotation trajectory of the rotary arm. A stopper is provided.

In the disc insertion error prevention mechanism schematically configured as described above, when the disc is in a loading standby state in which the disc can be loaded into the apparatus, both the rotating arms receive the driving force from the disc transport mechanism or the like and rotate to the open position. Since it is driven, the insertion slot allows the disc to be inserted. In this case, since one of the rotating arms is separated from the outer surface of the front plate by the elastic force of the leaf spring, the rotating arm can rotate along the outer surface of the front plate without contacting the stopper. . On the other hand, when the disc is loaded in the device and is in a play state, both rotating arms are held in a closed position that obliquely crosses the insertion slot by the biasing force of the spring, so another disc is inserted into the insertion slot. When trying to do so, one rotating arm is pressed against the outer surface side of the front plate against the elastic force of the leaf spring by the insertion force of the disc. As a result, the rotating arm comes into contact with the stopper and enters a locked state, so that the erroneous insertion of another disk into the apparatus can be prevented by the rotating arm. Also, when ejecting the disc loaded in the device, the disc's ejection force causes both rotations by abutting the outer periphery of the disc against the back of both rotation arms that obliquely close the insertion slot. The arm rotates in the opening direction against the spring force of the spring.
Japanese Patent Laying-Open No. 2005-267881 (page 7-8, FIG. 2)

  As described above, the disc error insertion preventing mechanism according to the prior art disclosed in Patent Document 1 has a pair of rotating arms that are shutter members arranged so as to be rotatable along the outer surface of the front plate. Regardless of this, since the rotating arm can surely prevent another disk from being erroneously inserted into the apparatus, the flap type in which the shutter member rotates outward of the front plate to open the insertion port. There is an advantage that the depth dimension of the entire disk device can be reduced. However, since the rotating arm is configured to selectively abut against the stopper protruding in the rotating locus, the leaf spring for bringing the rotating arm into and out of contact with the outer surface of the front plate There is a problem that the cost of parts and assembly cost increase due to the leaf spring. Further, since the leaf spring slides on the outer surface of the front plate while receiving its own elastic force as the turning arm turns, the driving load of the turning arm is caused by the frictional force between the leaf spring and the front plate. There is also a problem that the size becomes large and wear powder is generated.

  The present invention has been made in view of the actual situation of the prior art, and an object of the present invention is to provide a mechanism for preventing erroneous insertion of a disc that is suitable for reducing the depth of the entire disc device and that has a simple structure. There is.

The present invention uses a rotating arm that can be rotated along the outer surface of the front plate as a shutter member for the insertion port, and is provided with a restricting protrusion on the tip side away from the rotating fulcrum of the rotating arm, When the disc is inserted toward the rotating arm held at the closed position that crosses the insertion port diagonally, etc., the peripheral edge on the distal side in the insertion direction of the disc is overlapped with the restricting projection and comes into contact, The rotating arm is pressed in the closing direction by the insertion force of the disk so that rotation in the opening direction is prevented , and such a restricting projection is provided at a position that does not interfere with the disk ejecting operation. When the disc is ejected, the pivot arm is pivoted in the opening direction by the ejection force of the disc .

The disc mis-insertion preventing mechanism according to the present invention is provided with a restricting projection on the distal end side away from the pivoting fulcrum of the pivoting arm that is a shutter member, and directed toward the pivoting arm that is held at a closed position that obliquely crosses the insertion slot. When the disc is inserted, the peripheral portion on the front end side of the disc is overlapped with the restricting projection so that the two come into contact with each other. This makes it possible to reliably prevent another disk from being erroneously inserted into the apparatus by an extremely simple configuration in which the depth dimension of the entire disk apparatus is reduced and the restricting projection is provided on the rotating arm. it can. In addition, such a restricting projection is provided at a position that does not hinder the disk ejecting operation in the rotating arm, and when the disk is ejected, the rotating arm is rotated in the opening direction by the ejecting force of the disk. Therefore, it is not necessary to link the rotating arm with a special mechanism, and the mechanism can be simplified.

In the erroneous insertion prevention mechanism of the disc according to the present invention, a front plate provided with a slit-like insertion port for inserting and ejecting the disc, a rotating arm rotatable along the outer surface of the front plate, A spring member that urges the rotation arm in one direction to hold it in a closed position that obliquely crosses the insertion port, and rotates the rotation arm in the other direction against the urging force of the spring member. And a driving means for holding in an open position away from the insertion port, and provided with a restricting protrusion on the tip side away from the rotation fulcrum of the rotation arm, and the rotation arm in the closing position of the insertion port When the disk is inserted toward the disk, the rotation of the rotating arm in the opening direction is prevented by bringing the regulating protrusion into contact with the peripheral edge on the distal side in the insertion direction of the disk , and , Remove the restriction protrusion from the disc. Provided does not interfere with the operation position, when the disk is ejected, and configured such that the pivot arm is rotated in the opening direction by the discharge force of the disk.

According to the erroneous insertion preventing mechanism of the disk configured as described above, when the rotating arm is biased by the spring member and is held at the closed position that obliquely crosses the insertion port, the disk is directed toward the rotating arm. When the disc is inserted, the peripheral edge on the leading end side of the disc and the restricting projection provided on the rotating arm overlap and contact each other, so that the rotating arm is closed by the insertion force of the disc. Since the rotation in the opening direction is prevented by pushing the disk in the direction, the storage space for the shutter member required in front of the front plate is reduced, the depth dimension of the entire disk device is reduced, and the rotating arm By providing an extremely simple structure in which the restricting protrusion is provided on the disk, it is possible to reliably prevent another disk from being erroneously inserted into the apparatus. Further, since a leaf spring for moving the rotating arm to and away from the outer surface of the front plate is not necessary, the rotating load of the rotating arm can be reduced and the generation of wear powder can be suppressed. Further, the restricting projection is provided at a position that does not hinder the disk ejecting operation in the rotating arm, and when the disk is ejected, the rotating arm is rotated in the opening direction by the ejecting force of the disk. The rotating arm does not need to be interlocked with a special mechanism, and the mechanism can be simplified.

  In the above configuration, the material of the rotating arm is preferably a metal plate having higher rigidity than that of synthetic resin, and in this case, a bent portion protruding in a standing direction with respect to the outer surface of the front plate on one side edge of the rotating arm. While forming a curved part, it is preferable to make the said control protrusion protrude from a part of this bending curved part. If comprised in this way, while the mechanical strength of the rotation arm which consists of metal plates can be raised by a bending curved part, a disk is formed in the back side of the bending curved part which inclines in an insertion slot at the time of ejection of a disk. Since the outer peripheral edge of the disk contacts and rotates the rotating arm, the disk can be prevented from being damaged.

  In the above configuration, the insertion port may be opened and closed using one rotating arm, but the first and second rotating arms are pivotally supported on the outer surface of the front plate. The two pivoting arms are gear-coupled so that the ends of the two pivoting arms rotate synchronously in opposite directions, and at least one of the first and second pivoting arms is provided with a restricting projection. Even when the disc is inserted from the end position deviated from the center of the insertion slot, it is preferable that erroneous insertion of the disc can be reliably prevented.

  An embodiment will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing a main part of a changer-type disk device, FIG. 2 is a front view showing an erroneous insertion prevention mechanism when a rotating arm is in a closed position, and FIG. FIG. 4 is a front view showing an erroneous insertion prevention mechanism when the rotating arm is in the open position, FIG. 4 is a perspective view showing an essential part of the erroneous insertion prevention mechanism, and FIG. 5 is a rear view showing the internal mechanism of the variable power unit. 6 is a plan view showing the internal mechanism of the variable power unit, FIG. 7 is a perspective view of the erroneous insertion prevention mechanism when the disc is ejected, and FIG. 8 is a plan view of the main part showing the relationship between the rotating arm and the disc in the open position. It is.

  The changer type disk device according to the present embodiment can reproduce a disk D (small diameter disk) having an outer dimension of 8 cm and a disk D (large diameter disk) having a diameter of 8 cm, and accommodates a plurality of large diameter disks D. And a slot-in type disk reproducing apparatus capable of selectively reproducing one of the disks D. As shown in FIG. 1, this changer-type disk device includes a box-shaped housing 1 and a nose member 2 disposed in front of the housing 1, and a disk D is inserted into the nose member 2. A horizontally long opening 2a that can be inserted is provided. The nose member 2 is fixed to the front plate 3 of the housing 1, and the front plate 3 is provided with a slit-like insertion port 3 a communicating with the opening 2 a of the nose member 2. A predetermined gap S is secured between the nose member 2 and the front plate 3, and a disc erroneous insertion preventing mechanism is disposed in the gap S.

  As shown in FIGS. 2 and 3, the erroneous insertion prevention mechanism includes first and second rotating arms 4 and 5 that are rotatably supported on the outer surface of the front plate 3, and a first rotation. A clutch plate 6 arranged coaxially with the rotation center axis of the arm 4, a drive member 7 for rotating the first and second rotating arms 4 and 5 via the clutch plate 6, and the first and second rotations. A spring 10 or the like that urges the moving arms 4 and 5 to rotate in the closing direction is provided.

  The first and second rotating arms 4 and 5 function as shutter members for opening and closing the insertion port 3a, and both are formed in a long shape by pressing a metal plate. The first and second rotating arms 4 and 5 are rotatably supported on the outer surface of the front plate 3 using pins 11 and 12, respectively, and formed at one end (base end) of each. By engaging the gear portions 4a and 5a that are continuous in an arc shape, the first and second rotating arms 4 and 5 are coupled so as to rotate synchronously in opposite directions with the pins 11 and 12 as rotation fulcrums. Yes. Further, bent curved portions 4b and 5b are formed on one side edge along the longitudinal direction of the first and second rotating arms 4 and 5, and the first and second rotating arms made of a metal plate are formed. The mechanical strengths 4 and 5 are enhanced by these bent portions 4b and 5b. These bent portions 4b and 5b protrude in the standing direction with respect to the outer surface of the front plate 3, and a smooth curved surface is formed at the bent portion. Further, a guide protrusion 4d having a larger projection amount than the bent bending portion 4b is formed on the first rotating arm 4, and the guide protrusion 4d is a rotation fulcrum (pin 11) of the first rotating arm 4. ) Projecting integrally from the end portion of the bent portion 4b. On the other hand, the second turning arm 5 is formed with a restricting projection 5d having a larger protruding amount than the bending bending portion 5b. The bending bending portion 5b is a turning fulcrum (2) of the second turning arm 5. It protrudes integrally from the end of the bent portion 5b far from the pin 12). Since the first and second rotating arms 4 and 5 can be rotated along the outer surface of the front plate 3 as described above, a narrow gap S defined between the nose member 2 and the front plate 3 is used. An erroneous insertion prevention mechanism including the first and second rotating arms 4 and 5 can be accommodated therein, and the depth dimension of the entire changer type disk device is reduced accordingly.

  The clutch plate 6 is pivotally supported by a pin 11 that is a pivot point of the first pivot arm 4, and a torsion coil spring 13 is wound around the pin 11. The clutch plate 6 is integrally formed with an operation receiving portion 6 a and a spring receiving portion 6 b, and both arm portions of the torsion coil spring 13 are connected to the spring receiving portion 6 b and the first rotating arm 4. The first rotating arm 4 and the clutch plate 6 are urged in a direction in which they are always engaged by the elastic force of the torsion coil spring 13. The operation receiving portion 6a of the clutch plate 6 is in contact with the protrusion 7a of the drive member 7, and this drive member 7 uses a guide body interval changing mechanism (variable power portion) described later as a drive source in the left-right direction ( It slides in the direction of arrows X1-X2.

  The spring 10 is stretched between the front plate 3 and the second rotating arm 5, and the second rotating arm 5 is rotated counterclockwise in FIG. ) And the first rotating arm 4 that rotates synchronously with the second rotating arm 5 is urged in the clockwise direction (arrow A1 direction) in FIG. In addition, an operating portion 5c is bent at the tip of the second rotating arm 5, and a detection switch 15 operated by the operating portion 5c is mounted on the printed circuit board 14 fixed to the front plate 3. .

  As shown in FIGS. 1 and 4 to 6, the housing 1 is composed of an upper chassis 16 and a lower chassis 17 that are joined and integrated with each other, and the front plate 3 is composed of the upper chassis 16 and the lower chassis 17. It is fixed to the front of the machine using multiple screws. The upper chassis 16 is provided with a disk transport mechanism 18 and a disk storage section 19, and the disk transport mechanism 18 transports the disk D between the insertion slot 3 a and the play position and between the play position and the disk storage section 19. Is called. On the other hand, the lower chassis 17 is provided with a drive unit (not shown) on which an optical pickup or the like is mounted. This drive unit is moved between the retracted position and the drive position in the housing 1 by the drive drive mechanism 20. It is designed to move forward and backward. 4 and 6, the top plate portion of the upper chassis 16 is omitted, and in FIG. 5, the upper chassis 16 is shown upside down.

  The disk transport mechanism 18 will be briefly described. The disk transport mechanism 18 includes first and second guide portions (not shown) that are slidable in a direction perpendicular to the transport direction of the disk D. The distance between the two guide portions can be changed by a guide body interval changing mechanism (variable power portion) operated by using the motor 21 as a drive source. A motor 21, a wheel gear 22, a slide arm 23, and the like are disposed on the back surface of the top plate portion of the upper chassis 16, and the slide arm 23 is omitted in FIG. It is arranged so as to overlap the arm 23. A rack portion 23a formed on the slide arm 23 meshes with the wheel gear 22, and the slide arm 23 moves in the direction of the arrow X1-X2 as the motor 21 rotates. The drive member 7 is also supported by the top plate portion of the upper chassis 16 so as to be movable in the direction of the arrow X1-X2. As described above, the protrusion 7a of the drive member 7 is inserted through the front plate 3 to operate the clutch plate 6. By abutting against the receiving portion 6a, the driving member 7 is urged in the direction of the arrow X2 by the elastic force of the spring 10 which is the return means of the first and second rotating arms 4 and 5. The drive member 7 is formed with a receiving portion 7b bent at a position facing the protrusion 7a. The receiving portion 7b faces the operating projection 23b formed on the slide arm 23. Thereby, when the slide arm 23 moves to the end position in the arrow X1 direction with the rotation of the motor 21, the protrusion 7a is pressed by the operating protrusion 23b, and the drive member 7 moves in the arrow X1 direction.

  Although not shown in the figure, the wheel gear 22 is engaged with a pair of slide plates (not shown) that are components of the guide body interval changing mechanism, and the first and second guide portions described above are engaged with each other. It is provided on the slide plate. Then, another motor (see FIG. 5) 24 that supports a plurality of conveying pulleys P1, P2, P3 (see FIG. 1) having a groove portion in the first guide portion and is disposed on the top plate portion of the upper chassis 16 is supported. Driving force is transmitted to each conveying pulley group, and a conveying guide body having a guide groove extending linearly in the conveying direction of the disk D is provided in the second guide portion, whereby the conveying pulley group and the conveying guide body A rotational driving force is applied to the disc D sandwiched therebetween, and the disc D is transported between the insertion slot 3a and the play position or between the play position and the disc storage portion 19. In addition, by sliding the pair of slide plates using the motor 21 as a drive source, the transport pulley group of the first and second guide portions and the transport guide body can be brought close to and away from each other. Even a diameter disk D can be transported.

  In the changer type disk device configured as described above, when the disk D is in a standby state where an arbitrary disk D can be loaded into the apparatus, the first and second guide portions of the guide body interval changing mechanism are positioned closest to each other. The conveyance pulley group and the conveyance guide body are opposed to each other at an interval narrower than the diameter of the small-diameter disk D. In this case, the slide arm 23 is moved to the end position in the direction of the arrow X1 with the rotation of the motor 21 that is the drive source of the guide body interval changing mechanism, and the operation protrusion 23b of the slide arm 23 is the protrusion of the drive member 7. In order to press 7a in the same direction, the drive member 7 is slid in the left direction (arrow X1 direction) in FIG. As a result, as shown in FIG. 3, the clutch plate 6 and the first rotating arm 4 are rotated counterclockwise (arrow A2 direction) by the protrusion 7a of the driving member 7, and the first rotation is performed. In synchronization with the arm 4, the second rotating arm 5 rotates clockwise (in the direction of arrow B <b> 2), and the detection switch 15 is turned on by the operating portion 5 c of the second rotating arm 5. As a result, both the first and second rotating arms 4 and 5 are retracted to the open position above the insertion port 3a, and the insertion port 3a is opened to permit the insertion of the disc D. The disc D can be inserted into the housing 1 from the opening 2a of the nose member 2 through the insertion port 3a.

  When the first and second rotating arms 4 and 5 are prevented from freely rotating during the loading standby, for example, the user inserts a finger or the like through the opening 2a of the nose member 2 and the first and second rotating arms are inserted. When a mischief of forcibly pressing at least one of the rotating arms 4 and 5 is performed, the clutch plate 6 rotates with respect to the first rotating arm 4 whose rotation is prevented by the protrusion 7a of the driving member 7. It will be. Therefore, the large driving force from the driving member 7 directly acting on the first rotating arm 4 is absorbed by the rotation of the clutch plate 6, thereby damaging the first and second rotating arms 4, 5. Can be prevented.

  When the disk D is inserted into the housing 1 from the insertion port 3a in the loading standby state, the distance between the first and second guide portions is set to a suitable distance for transporting the disk D using the motor 21 as a drive source. In addition, since the transport pulley group is rotationally driven using another motor 24 as a drive source, the inserted disk D is sandwiched between the first and second guide parts and transported to the inner part of the housing 1. Then, it is played as it is or stored in the disk storage unit 19. In this case, since the distance between the first and second guide portions is widened from the closest position to the outside, the slide arm 23 moves in the X2 direction from the end position in the direction of the arrow X1, and accordingly, the drive member 7 is also X2. Move in the direction. As a result, the first and second rotating arms 4 and 5 are synchronously rotated in opposite directions by the tensile force of the spring 10, and a part of the insertion port 3a is first and second as shown in FIG. The rotary arms 4 and 5 are crossed obliquely and closed. Further, since the detection switch 15 is turned off by the rotation of the second rotation arm 5 in the closing direction, it is detected that the disk D is loaded in the housing 1 based on the switching signal. In this closed position, the first and second rotating arms 4 and 5 are inclined opposite to each other in a front view with respect to a straight line along the longitudinal direction of the insertion port 3a and are opposed to each other. The restricting projection 5d is located in the vicinity of the lower side of the insertion port 3a. However, the distance between the bending curved portions 4b and 5b of the rotating arms 4 and 5 on the insertion port 3a is larger than the diameter of the small-diameter disk D. It is set to a narrow interval.

  As described above, since the first and second rotating arms 4 and 5 are retracted to the open position above the insertion port 3a in the loading standby state, the disk D is with respect to the opening 2a of the nose member 2. When a normal insertion operation of inserting in a substantially horizontal posture is performed, the disk D is inserted into the housing 1 from the insertion port 3a without contacting the first and second rotating arms 4 and 5. The On the other hand, when an unusual insertion operation is performed in which the disk D is inserted in an extremely obliquely upward posture with respect to the opening 2a, the disk D is formed on the first and second rotating arms 4 and 5. Although it goes to the bending curved portions 4b and 5b, the upper surface of the peripheral edge at the distal end side in the insertion direction of the disk D is guided by the lower surface of the guide projection 4d formed on the first rotating arm 4, and the insertion opening 3a Since it is guided in the direction, contact between the disk D and the edges of the bent portions 4b and 5b is avoided, and damage to the disc D due to the edges of the bent portions 4b and 5b can be prevented.

  During the play operation of the disc D or during the change operation between the disc storage portion 19 and the play position, the slide arm 23 is held in the state of moving in the X2 direction, and the first and second guide portions are separated from each other. Since it is in a state, as shown in FIG. 2, the first and second rotating arms 4 and 5 are maintained in a closed position that obliquely crosses the insertion port 3a. In this state, when the user inserts another disk D into the opening 2a of the nose member 2, as shown in FIG. 8, the peripheral edge of the disk D in the insertion direction and the regulating protrusion 5d of the second rotating arm. And the lower surface of the peripheral edge of the disk D abuts on the edge portion of the upper surface of the restricting projection 5d, so that the second rotating arm 5 is pressed in the closing direction by the insertion force of the disk D. Therefore, the second rotating arm 5 is prevented from rotating in the opening direction by the insertion force of the disk D, and the first rotating arm 4 that rotates in synchronization with the second rotating arm 5 is also in the opening direction. Therefore, even if another disk D is mistakenly inserted into the opening 2a of the nose member 2 during the operation of the disk D in the housing 1, the disk D is in the first and second positions. It is possible to reliably prevent another disk D from being erroneously inserted into the housing 1 because the rotary arms 4 and 5 cannot pass through the insertion port 3a.

  Further, when ejecting the disk D loaded in the housing 1, the disk D is sandwiched between the first and second guide portions by rotating the transport pulley group in the direction opposite to that at the time of insertion. And transported to the front side of the housing 1. As a result, as shown in FIG. 7, the outer peripheral edge of the disk D abuts against the back surfaces of the first and second rotating arms 4 and 5 closing the insertion port 3 a, and the first and first rotations are caused by the discharge force of the disk D. Since the two rotating arms 4 and 5 are rotated in the opening direction (A2 and B2 directions), the disk D can be taken out of the nose member 2 through the insertion port 3a and the opening 2a. At this time, the outer peripheral edge of the disk D conveyed in the ejecting direction abuts against the bent portions 4b and 5b of the first and second rotating arms 4 and 5, and these bent portions 4b and 5b are inserted into the insertion opening. The first and second rotating arms 4 are not damaged without damaging the disk D because they are inclined in the opposite direction with respect to the straight line along the longitudinal direction of 3a and the bent portion has a smooth curved surface. , 5 can be rotated in the opening direction.

  In the above-described embodiment, the restriction projection 5d is provided only on one second rotation arm 5 out of the first and second rotation arms 4 and 5 that are gear-coupled so as to rotate synchronously. As described above, such a restricting projection may be provided on the other first rotating arm 4 and both the first and second rotating arms 4 and 5. The same applies to the guide protrusion 4d provided on the first rotating arm 4, and such a guide protrusion is provided on both the second rotating arm 5 and the first and second rotating arms 4, 5. May be.

It is sectional drawing which shows the principal part of the changer type disc apparatus which concerns on an Example. It is a front view which shows the erroneous insertion prevention mechanism when a rotation arm exists in a closed position. It is a front view which shows the erroneous insertion prevention mechanism when a rotation arm exists in an open position. It is a perspective view which shows the principal part of an incorrect insertion prevention mechanism. It is a reverse view which shows the internal mechanism of a variable power part. It is a top view which shows the internal mechanism of a variable power part. It is a perspective view of an erroneous insertion prevention mechanism at the time of ejecting a disc. It is a principal part top view which shows the relationship between the rotation arm in an open position, and a disk.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Housing | casing 2 Nose member 2a Opening 3 Front plate 3a Insertion slot 4 1st rotation arm 4a Gear part 4b Bending curve part 4d Guide protrusion 5 2nd rotation arm 5a Gear part 5b Bending curve part 5d Restriction protrusion 7 Drive member 7a Projection 10 Spring (spring member)
11, 12 pins

Claims (3)

A front plate provided with a slit-like insertion slot for inserting and ejecting a disc, a rotating arm that can rotate along the outer surface of the front plate, and a rotating arm that rotates in one direction. A spring member that holds the insertion port obliquely across the insertion port, and rotates the rotation arm in the other direction against the biasing force of the spring member to an open position away from the insertion port. Holding means for holding,
When a disc is inserted toward the turning arm at the closed position of the insertion port, a restricting projection is provided on the tip side away from the turning fulcrum of the turning arm. The restricting projection is brought into contact with a portion to prevent rotation of the rotating arm in the opening direction , and the restricting projection is provided at a position that does not hinder the disc ejecting operation. A mechanism for preventing erroneous insertion of a disc, characterized in that when the disc is ejected, the pivot arm is pivoted in the opening direction by the ejecting force of the disc.   2. The bending arm according to claim 1, wherein the turning arm is made of a metal plate, and a bent curved portion protruding in a standing direction with respect to an outer surface of the front plate is formed on one side edge of the turning arm, A mechanism for preventing erroneous insertion of a disc, wherein the restricting protrusion is protruded from a part of the bent portion.   3. The rotary arm according to claim 1, wherein the rotary arm includes first and second rotary arms pivotally supported on an outer surface of the front plate, and ends of the first and second rotary arms. A mechanism for preventing erroneous insertion of a disc, wherein gears are coupled so as to rotate synchronously in opposite directions and at least one of the first and second rotating arms is provided with the restricting projection.

Images