JPH0746462B2 - Disk loading mechanism - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a disc loading mechanism that conveys and mounts an inserted disc on a turntable in a compact disc player, a laser disc player, or the like. In particular, the present invention relates to technical improvement for avoiding useless operation of the drive motor and protecting the drive motor.

[Prior Art] For example, in a compact disc player, a disc is mounted on a turntable for disc play, but when mounting the disc on the turntable, the surface of the turntable is opened and By placing the disc on the turntable directly from the opening or via the guide, or by placing the disc on a horizontally movable slider and sliding the slider from the outer peripheral side of the turntable onto the turntable, Conventionally, a method of transferring a disc onto a turntable has been adopted.

However, when the above disc mounting method is adopted, the disc is difficult to mount in a disc player of a type that is installed in a place where it is susceptible to vibration such as a compact disc player mounted on a vehicle and is used due to the vibration. There are drawbacks.

For this reason, in recent years, as shown in FIG. 6, by transporting the disc onto the turntable while securely holding it, the disc can be reliably transported onto the turntable without being affected by vibration. A disc loading mechanism that can be mounted has been proposed. In this disc loading mechanism, a turntable 2 is provided inside the chassis 1, a disc insertion opening 3 is provided on the front surface of the chassis 1, and a conveyance roller 4 is provided between the turntable 2 and the disc insertion opening 3. . Then, as shown in FIG. 7, the conveying roller 4 and the supporting member 5 arranged opposite thereto sandwich the disc 6 inserted from the disc insertion opening 3 from above and below, and rotate the conveying roller 4. Then, the disc 6 is conveyed onto the turntable 2. At this time, the front edge of the disc 6 abuts on the pair of positioning stopper pins 7 provided at two positions in front of the transport path, and the center hole 6a of the disc 6 is positioned on the turntable 2. Has become. In this way, when the suction operation is completed and the positioning of the disc and the turntable is completed, subsequently, the chucking operation plate (not shown) is activated to mount the disc on the turntable, and then the chucking is performed. The operation completion position of the king operation plate is detected by a micro switch or the like, and the loading motor is stopped to complete the loading.

According to such a disc loading mechanism, the disc 6 can be conveyed while being surely held by sandwiching the disc 6 by the conveying roller 4 and the supporting member 5, so that the disc 6 may be vibrated during the conveyance. There is no risk of rattling or displacement, and it is possible to reliably load the turntable 2.

However, the above conventional techniques have the following drawbacks.

That is, since the transport roller 4 is normally held above by a spring or the like, when the inserted disc 6 is securely sandwiched between the transport roller 4 and the support member 5, the transport roller 4 starts to rotate. The transfer roller 4 and the supporting member 5 by pressing the transfer roller 4 once.
Need to be sandwiched between. For that purpose, the disc 6 must be pushed in with a strong force, and the operation feeling is deteriorated. Therefore, the rotation of the transport roller 4 is started before the disc 6 is nipped by the transport roller 4,
It is desirable to start loading immediately when the disc 6 is nipped by the transport roller 4 to improve the operation feeling. However, in this case, even if the transport roller 4 is rotated, if the disc 6 is not inserted to the position where it is sandwiched by the transport roller 4, the transport roller 4 continues to rotate unnecessarily without loading the disc 6, Since the drive motor for driving No. 4 continues to operate unnecessarily, an extra load is applied to the drive motor, which not only shortens the service life but also makes it impossible to perform display unless the operator notices it. It is inconvenient.

[Problems to be Solved by the Invention] The present invention has been proposed in order to solve the above-mentioned drawbacks of the prior art, and its purpose is to prevent the inserted disc from being sandwiched by the transport rollers. The drive motor is operated so that loading can be started immediately without being impacted when the disc is pinched by the transport rollers, and when the disc cannot be pinched by the transport rollers due to insufficient insertion of the disc, the drive motor The object of the present invention is to provide an excellent disc loading mechanism that can obtain an excellent operation feeling by stopping the operation after a certain period of time and that does not wastefully operate the drive motor.

[Means for Solving the Problems] In order to solve the above problems, the invention according to claim 1 is provided in a disk player capable of playing disks having two kinds of diameters, large and small. In a disc loading mechanism for transporting and mounting a disc, which is inserted from a disc insertion port provided on the front surface of the chassis of the disc player, on a turntable provided at the back of the chassis, the disc insertion port and the turntable are connected to each other. Provided between the two, and sandwiching the disc inserted from the disc insertion opening, the transport roller for transporting onto the turntable by rotation, a drive motor for driving the transport roller, and the presence or absence of the disc can be detected, At least one is provided near the transport roller and near the center of the disc insertion opening, and near the transport roller. And at least two disc detecting means near both ends of the disc insertion opening at intervals longer than the diameter of the small diameter disc and shorter than the diameter of the large diameter disc, and based on the outputs from these disc detecting means. Control means for starting and stopping the drive motor, and guides the disc to the inner side of the turntable according to the diameter of the disc detected by the disc detection means, and positions the center of the disc at the center of the turntable. And positioning means.

Further, in the control means according to the first aspect of the present invention, in the standby state, based on the output from at least one of the disk detecting means, any one of the disks having the large and small diameters is detected. If it is determined that the disc has been inserted, the drive motor is started at the time of the determination, and at the same time, the disc is inserted for a predetermined set time from the time of the determination. Based on the pattern of the combination of the outputs from the detection means, it is determined whether or not any one of the disks having the large and small diameters has reached the holding position where it is held by the conveying roller, and the setting is performed. If it is determined that none of the discs of two sizes, large and small, have reached the holding position by the time elapsed, the previous Configured to stop the drive motor.

Further, the invention described in claim 2 is the disk loading mechanism according to claim 1,
The positioning means is provided on the inner side of the turntable so as to be rotatable in synchronization with each other, and a pair of stopper arms, and the end portions of the pair of stopper arms can contact the edge of the disc. And a stopper pin movably provided between a rear stopper position for a large-diameter disc and a front stopper position for a small-diameter disc according to the rotation of the stopper arm. To do.

[Operation] The operation of the disc loading mechanism of the present invention having the above-described configuration is as follows. That is, in the invention described in claim 1, first, when the insertion of the disk is detected based on the output from at least one of the at least three disk detection means, the drive motor is controlled by the control means. Since it can be activated and the rotation of the transport roller can be started, loading can be started immediately without being impacted when the disc is nipped by the transport roller, and the operation feeling is excellent.

Moreover, after detecting the insertion of the disc, whether or not the disc has been sufficiently inserted up to the nipping position where it is nipped by the conveying rollers based on the pattern of the combination of outputs from at least three disc detecting means. Can be detected. The disc sandwiched by the transport rollers is transported by the transport rollers and guided by the positioning means provided on the inner side of the turntable according to its diameter, and the center of the disc is positioned at the center of the turntable. To be done.

On the other hand, when the disc has not reached the holding position even after the set time elapses from the point of time when the disc holding is detected as described above, that is, when the insertion amount is insufficient and conveyance is impossible, the control means Since the drive motor can be stopped immediately by the above, there is no fear of wastefully operating the drive motor.

Particularly, in the present invention, at least one disc detecting means is provided near the transport roller and near the center of the disc insertion opening, and a disc having a small diameter is provided near the transport roller and near both ends of the disc insertion opening. Since at least two discs having a diameter larger than the diameter and shorter than the diameter of the disc having a large diameter are arranged, by using a pattern of a combination of outputs from the disc detecting means, a disc having two kinds of diameters, large and small, can be used. It is possible to detect the insertion and pinching of all of them. Further, since the arrangement of the disc detecting means is devised as described above, the type of disc (disc diameter) can be discriminated based on the pattern of the combination of outputs of the disc detecting means.

According to the second aspect of the invention, first, when the insertion of the small-diameter disk is detected, the stopper pin is held at the stopper position for the small-diameter disk on the front side.
Therefore, the inserted small-diameter disk contacts the stopper pin, and its center is set to the center of the turntable. Then, when the insertion of the large-diameter disk is detected, the rotation restriction of the stopper arm is released. Therefore, the stopper pin is pressed by the large-diameter disk, the pair of stopper arms rotate synchronously, and the stopper pin moves to the inner side. Further, the stopper pin moves to the stopper position for the large-diameter disc, and the center of the disc is set at the center of the turntable.

[Embodiment] An embodiment in which the disc loading mechanism of the present invention as described above is applied to an in-vehicle compact disc player compatible with both 12 cm standard discs and 8 cm standard small diameter discs is shown in FIG. 1 to FIG. This will be specifically described with reference to FIG. The same members as those in FIGS. 6 and 7 are designated by the same reference numerals, and the description thereof will be omitted.

That is, as shown in FIG. 1, as the plurality of disc detecting means, the five detecting sensors A to E are connected to the conveying roller 4
Is disposed near the disk insertion port 3 side.
These detection sensors A to E include a first end sensor A, a second end sensor E located at both ends, and these end sensors A,
Central sensor C located almost in the center of E and each end sensor
A first intermediate sensor B located between A, E and the central sensor C,
It is composed of a second intermediate sensor D.

As shown in FIG. 2, each of these detection sensors A to E is composed of a pair of LEDs 10 and a light receiving section 11, and when there is no light shield in the gap between the two, the light from the LED 10 is received by the light receiving section 11.
Therefore, the light receiving unit 11 detects that the light receiving unit 11 is in the open state, and the non-detection mode is set. In contrast, LED1
When there is a light shield in the gap between 0 and the light receiving unit 11, the light from the LED 10 does not reach the light receiving unit 11, so the light receiving unit 11 senses that the light receiving unit 11 is in the closed state, and the detection mode is set.
Specifically, 8cm disc 8 and 12cm as shown in Fig. 1
When the vapor deposition portions 8a, 12a of the disk 12 or other light-shielding objects overlap any of the detection sensors A to E, the detection sensor closes to enter the detection mode, and when the disks do not overlap, or the vapor deposition is performed. When only the light-transmitting portions of the outer peripheral portion or the inner peripheral portion of the portions 8a and 12a overlap each other, the detection sensor is opened to take the non-detection mode.

Here, the details of the positional relationship of the five detection sensors A to E shown in FIG. 1 with respect to the 8 cm disk 8 and the 12 cm disk 12 will be described.

First, the central sensor C is arranged at a position slightly deviated to the left side in the drawing from the center of the turntable 2, and when the 12 cm disc 12 is inserted and when the 8 cm disc 8 is inserted from the sensor, each disc 8 is inserted. The first and second vapor deposition parts 8a and 12a are adapted to be closed.

Next, the first intermediate sensor B and the second intermediate sensor D are reliably closed by the vapor deposition portions 8a and 12a of the respective disks 8 and 12 when the 12 cm disk 12 is inserted and when the 8 cm disk 8 is inserted from the center. Are arranged as follows. And 8c
When the insertion position of the m disk 8 is largely displaced to the left and right ends in the figure, the intermediate sensor B or D on the opposite side to this displacement direction is opened, but when the displacement of the insertion position is small, both are closed. It is like this. Further, since the central sensor C is displaced to the left side in the figure, when the insertion position of the 8 cm disc 8 is largely displaced to the left side in the figure, the first intermediate sensor B and the central sensor C are almost at the same time. If it closes and the insertion position of the 8 cm disc 8 deviates greatly to the right in the figure, the central sensor C will be
The second intermediate sensor is closed.

Finally, the first end sensor A and the second end sensor E are 12 cm
When inserting the disk 12, the 12cm vapor deposition part 12a of the disk 12
It is arranged so as to be surely closed. The distance between the first end sensor A and the second end sensor E is
The diameter is made larger than the diameter of the 8 cm disc 8, and at least one of them is opened when the 8 cm disc 8 is inserted. That is, as shown in FIG.
If the 8 cm disc 8 is inserted from the center,
Both the end sensor A and the second end sensor E are opened,
Also, when the 8 cm disk 8 is inserted to the left in the drawing or to the right in the drawing, the end sensor A or E on the same side closes, but the end sensor E or A on the opposite side surely opens. It has become.

Further, when the 12 cm disc 12 or the 8 cm disc 8 is sandwiched between the transport rollers 4, at least three adjacent discs are provided.
The individual detection sensors are designed to be closed. That is, when the 12 cm disc 12 is sandwiched by the transport rollers 4 or the 8 cm disc 8 is sandwiched by the transport rollers 4 at the center position, the three detection sensors (B,
C, D) are closed. Further, when the 8 cm disc 8 is sandwiched by the conveying rollers 4 at a position displaced to the left side in the figure, the three sensors (B, C, D) in the same center are closed, or the three sensors on the left side in the figure are closed. Sensor (A, B,
C) is closed, or the first end sensor A and the second intermediate sensor D are simultaneously closed and a total of four sensors (A, B, C, D) are closed. Similarly, when the 8 cm disc is sandwiched by the transport rollers 4 at a position displaced to the right in the figure, the three central sensors (B, C,
D) is closed, or the three sensors (C, D, E) on the right side in the figure are closed, or the first intermediate sensor B and the second end sensor E are closed at the same time, for a total of 4
The individual sensors (B, C, D, E) are closed.

On the other hand, a control means 31 is connected to these detection sensors A to E as shown in FIG. This control means 31
Is the central sensor C of the detection sensors A to E and the second sensor
The disc insertion is determined based on the presence or absence of the output (detection signal) from the intermediate sensor D, and the drive motor 32 is determined at this time.
Is activated to start rotation of the transport roller 4. In addition, a predetermined set time is set in the control means 31 starting from the time when the disc is determined to be inserted. This set time is at least the disc is pinched by the transport roller 4 after the disc is inserted. It is longer than the estimated time required to reach the holding position. Then, this control means 31 determines whether or not the disc has reached the holding position based on the combination of outputs (detection signals) from the detection sensors A to E from the disc insertion determination time, and sets the set time. If it is determined that the clamping position has been reached before the time elapses,
When the operation of the drive motor 32 is continued as it is and it is determined that the holding position has not been reached before the set time elapses, the drive motor 32 is stopped at the time of the determination.

Incidentally, in FIG. 1, reference numerals 23 and 24 are members constituting positioning means. 23 is rotatably arranged on a support shaft 23a,
These are a pair of stopper arms provided with stopper pins 24 at their rotating ends, and when an 8 cm disc 8 is inserted, a solenoid (not shown) attracts the 8c to the front.
When the 12cm disc 12 is inserted while being held at the stopper position for the m disc 8, the solenoid is released from attraction and can be rotated. It rotates to the stopper position for the 12 cm disc 12 as shown in FIG. 2 and is fixed at the same position. Further, the pair of stopper arms 23 are connected by a gear 23b provided at the base end portions thereof, and are configured to move back and forth in synchronization.

The operation of this embodiment having the above configuration will be described with reference to the flowchart of FIG.

Disk insertion monitoring state (loading standby state) In the disk insertion monitoring state, only the central sensor C and the second intermediate sensor D are turned on, and the other detection sensors A, B, E are turned off. The reason why only the two detection sensors C and D are turned on in this way is as follows. That is, in the on-vehicle audio equipment, it is necessary to put the compact disc player mounted therein into the activation standby state even when the engine is not operating. Therefore, in the optical detecting means of this embodiment, the LED 10 should be turned on. is necessary. However, in this case, if the current is not kept as low as possible, there is a risk that the battery will run down, so the detection sensors other than the necessary minimum are turned off to minimize the current consumption. Further, the reason why the lit detection sensor is the central sensor C and the second intermediate sensor D is that it is the detection sensor which is first closed when the disc is inserted. That is, as described above, when the 12 cm disc is inserted and when the 8 cm disc is inserted from the center, the central sensor C is first closed, and when the insertion position of the 8 cm disc 8 is largely displaced to the left side in the drawing,
When the first intermediate sensor B and the central sensor C are closed almost at the same time and the insertion position of the 8 cm disc 8 is largely displaced to the right side in the drawing, the second intermediate sensor D is closed prior to the central sensor C. Therefore, the central sensor C and the second
If the intermediate sensor D is turned on, either one of the sensors C or D is always closed before the disc comes into contact with the transport roller 4, so that the control means 31 is controlled by the one of the sensors C or D. With the detection signal of, the insertion of the disc can be detected reliably and easily.

Disc Insertion Detection and Disc Holding Monitoring State In the disc insertion monitoring state as described above, when one or both of the central sensor C and the second intermediate sensor D is closed and a detection signal is issued, the control means 31
Determines that the disc has been inserted. Then, when the control means 31 determines that the disk has been inserted in this way, the other three detection sensors A, B, and
E is immediately turned on to start monitoring whether the disc has reached the sandwiching position (disc sandwiching monitoring state), and at the same time, the drive motor 32 is activated to start rotation of the transport roller 4.

Disc clamping detection Further, at least three detection sensors adjacent to each other, that is, the sensor (A, B, C) or the sensor (B, C) until the predetermined set time elapses from the time when the disc insertion is determined as a starting point. , D) or sensors (C, D, E) are closed,
When the detection signal is issued, the control means 31 determines that the inserted disc has reached the sandwiching position and is sandwiched by the transport rollers 4, and continues the operation of the drive motor 32 as it is. In this case, since the transport roller 4 is rotated in advance, when the disc is nipped by the transport roller 4, loading can be immediately started without receiving an impact, which is excellent in operation feeling.

Then, the loaded disc is conveyed to the turntable 2. At this time, when the 8 cm disc 8 is inserted, since the stopper arm 23 is held at the stopper position for the 8 cm disc 8 by the attraction of the solenoid, the edge of the 8 cm disc 8 abuts the stopper pin 24 and remains as it is. It is set at the center of the turntable 2. Then, when the 12 cm disc 12 is inserted, the stopper arm 23 is released from the adsorption of the solenoid and is rotatable, so that the stopper pin 24 is pushed by the 12 cm disc 12 to move to the back side, It is rotated to the stopper position for the 12 cm disc 12 and fixed at the same position, and the center of the 12 cm disc 12 is set at the center of the turntable 2.

Disc non-detection and drive motor stop On the other hand, at least three detection sensors adjacent to each other, that is, sensors (A, B, C) until the predetermined set time elapses from the disc insertion determination time as a starting point. Alternatively, if the sensor (B, C, D) or the sensor (C, D, E) does not close, the control means 31 does not reach the holding position of the disk and is not held by the transport roller 4. Then, the drive motor 32 is stopped. Therefore, if the inserted disk is insufficiently loaded and the disk cannot be loaded, there is no risk of wastefully operating the drive motor.

As described above, in the present embodiment, it is possible to judge the insertion of two types of discs, the 8 cm disc and the 12 cm disc, based on the detection signals from the central sensor C and the second intermediate sensor D, and the five sensors A to The sandwiching of the disc can be determined based on the combination of the detection signals from E.
In other words, the central sensor C and the second intermediate sensor D
, And the remaining sensors A, B, E act as dedicated sensors for detecting the sandwiching.

Particularly, in this embodiment, five detection sensors A to E are used, and when the 12 cm disc is inserted, both the first end sensor A and the second end sensor E are surely closed. When inserting a 8 cm disc, either end sensor A or E is surely opened, so the diameter of the inserted disc is 12 cm based on the presence or absence of detection signals from both sensors A and E. It is also possible to determine whether it is 8 cm.

By discriminating the diameter of the disc in this way, the positioning operation performed by the stopper arm 23 can be surely performed according to the disc diameter, and also according to the disc type display and the disc diameter. It also becomes possible to easily perform play operations.

Further, in the case where the disc nipping is detected by the combination of the five detection sensors as described above, even if the optical system of one detection sensor fails, the other four Since the detection and insertion of the disc can be detected by the individual detection sensors, it is excellent in practicality.

The present invention is not limited to the above embodiment, and the arrangement and number of detection sensors can be freely selected. For example, as shown in FIG. 5, in addition to the five detection sensors A to E in the above embodiment, a dedicated insertion detection sensor H for detecting the insertion of the disc is provided in front of the central sensor C. A configuration is possible in which the five detection sensors A to E are used as dedicated sensors for detecting pinching. In this embodiment, the number of the LEDs that are constantly turned on is only one (the LED of the insertion detection sensor H), so that the insertion of the disk can be detected earlier than in the above embodiments. Further, the number of detection sensors may be any number as long as it is three or more, and thus a configuration in which more detection sensors are provided is also possible.
Further, the position where the detection sensor is provided is not limited to the disc insertion opening side of the transport roller 4, but may be provided on the turntable side of the transport roller 4.

Further, the present invention is not limited to the in-vehicle compact disc player, but is similarly applicable to general compact disc players for discs having large and small diameters, and also to a laser disc player and the like. The same is applicable and the same effect can be obtained.

[Effects of the Invention] As described above, according to the present invention, a simple configuration is provided in which a plurality of disc detection means and a control means for starting and stopping the conveying roller based on these detection signals are provided. When the disc is pinched by the transport rollers, loading can be started immediately without receiving an impact, and if the disc is not pinched by the transport rollers due to insufficient transport of the disc, the drive motor can be immediately stopped. It is possible to provide an excellent disk loading mechanism that has a good feeling and that does not wastefully operate the drive motor.

In particular, the present invention can detect insertion and pinching of a disc having two kinds of diameters, large and small, by utilizing a pattern of combinations of outputs from a plurality of disc detecting means. Since it is also possible to discriminate the type of the disc, it is possible to provide a disc loading mechanism of extremely high practicality in the present situation where disc players corresponding to discs of two sizes, large and small, are the mainstream.

Further, by providing a positioning means composed of a rotatable stopper arm and a stopper pin capable of abutting on the disc, the center of the disc having two kinds of sizes, small and large, can be accurately set on the center of the turntable. A mechanism can be provided.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of a disc loading mechanism according to the present invention, FIG. 2 is a side view of a main portion of the embodiment, FIG. 3 is a block diagram showing a circuit configuration of the embodiment, and FIG. Is a flow chart showing the operation of the same embodiment, FIG. 5 is a plan view showing a different embodiment of the present invention, FIG. 6 is a plan view showing a conventional disc loading mechanism, and FIG. 7 is a plan view showing the conventional example of FIG. It is a side view which shows a loading operation in steps. 1 ... Chassis, 2 ... Turntable, 3 ... Disc insertion port, 4 ... Conveying roller, 5 ... Supporting member, 6 ...
Disk, 6a ... Center hole, 7 ... Stopper pin, 8 ...
8cm disc, 8a, 12a …… Deposited part of disc, 10 ……
LED of the detection sensor, 11 ... Reception part of the detection sensor, 12 ... 1
2cm disc, 23 …… stopper arm, 23a …… spindle, 23
b …… gear, 24 …… stopper pin. 31: control means, 32: drive motor. A: first end sensor, B: first intermediate sensor, C:
Central sensor, D ... second intermediate sensor, E ... second end sensor, H ... insertion detection sensor.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-1-173469 (JP, A) JP-A-1-227258 (JP, A) JP-A-63-113974 (JP, A) Actual flat 2- 80360 (JP, U) Actual flat 2-65255 (JP, U) Actual flat 2-26161 (JP, U)

Claims (2)

[Claims] 1. A disc player capable of playing discs having large and small diameters, and a disc inserted from a disc insertion opening provided on the front face of the chassis of the disc player is provided at the back of the chassis. A disc loading mechanism for transporting and mounting on a turntable, which is provided between the disc insertion opening and the turntable, holds the disc inserted from the disc insertion opening, and transports it on the turntable by rotation. A transport roller for driving the transport roller, a drive motor for driving the transport roller, and the presence / absence of a disc can be detected, and at least one is disposed near the transport roller and near the center of the disc insertion port, and in the proximity of the transport roller. Moreover, the diameter of a large disc is longer than the diameter of a small disc near both ends of the disc insertion slot. In the standby state, at least two disc detecting means arranged at short intervals, and in the standby state, one of the discs having two kinds of diameters, large and small, is discriminated based on the output from at least one of the disc detecting means. If it is determined that the disc has been inserted, the drive motor is started at the time of the determination, and at the same time, the disc is inserted for a predetermined set time from the time of the determination. Based on the pattern of the combination of the outputs from the detection means, it is determined whether or not any one of the disks having the large and small diameters has reached the holding position where it is held by the conveying roller, and the setting is performed. If it is determined that none of the discs of two sizes, large and small, have reached the holding position by the time elapsed, A control means for stopping the drive motor at the time of disconnection; and a positioning means for guiding the disk according to the diameter of the disk and positioning the center of the disk at the center of the turntable on the inner side of the turntable. A disk loading mechanism characterized by that. 2. The positioning means comprises a pair of stopper arms provided on the inner side of the turntable so as to be rotatable in synchronism with each other, and an edge of the disc at each end of the pair of stopper arms. And a stopper pin provided so as to be capable of abutting on the rear end and movable between a rear stopper position for a large-diameter disc and a front stopper position for a small-diameter disc according to the rotation of the stopper arm. The disk loading mechanism according to claim 1, wherein