JP2007149227A - Disk drive unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a disk drive unit which prevents a disk from falling out from a slot part before it is pulled out by a user while the disk is stopped at a position where its center hole is partially exposed to outside of a casing from the slot part. <P>SOLUTION: The disk drive unit provided with a disk carrying mechanism for carrying-in the disk inserted to the slot part of the casing to a drive position in the casing and carrying-out the disk at the drive position to the eject position where its center hole is partially exposed to the outside of a casing has a means for preventing the disk carried out from the drive position to the eject position from falling out. The means is provided with a disk stopper 25 which comes into a state of having entered the center hole of the disk at the eject position of the disk linked with the carrying out operation of the disk, and a leaf spring 30 for holding this at an entering position and a leaving position with respect to the center hole of the disk. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a disk drive device typified by a CD player or a DVD recorder, and in particular, when a disk is automatically unloaded to an eject position, the disk drive can hold the disk in an eject position until the disk is artificially removed. Relates to the device.

  2. Description of the Related Art Conventionally, disk drive devices that record music information or the like on a disk such as a CD or DVD and reproduce the recorded information are generally well known. Such a disk drive device has a disk drive unit equipped with a turntable for rotating the disk and a pickup moving in the radial direction of the disk, and the turntable chucks the center of the disk between the clamp plate and the disk drive unit. The recording information on the disc can be read and the information can be written by a pickup that moves in the radial direction while rotating the disc.

  In particular, as such a disk drive device, a disk transport mechanism that carries in and out a disk between a slit-shaped opening (slot part) and a turntable constituting the disk drive unit without using a tray on which the disk is placed is provided. Is known.

  Such a disk drive device is called a slot-in type, and as such a disk drive device, in order to prevent the disk to be taken out from being vigorously carried out from inside the device, the disk at the time of carry-out is placed on both sides in the longitudinal direction of the slot portion. The thing which provided the brake member for pinching | interposing from is known (for example, patent document 1).

JP-A-8-167208 (paragraphs 0125 to 0128 and FIGS. 14 to 15)

  However, according to the configuration in which the pair of left and right brake members are pressed against the end surface of the disc as in Patent Document 1, the braking force acting on the disc varies due to the clamping force of the brake member, and the stop position of the disc changes each time. In the worst case, there is a possibility that the disk may fall out of the slot without being stopped.

  In particular, in Patent Document 1, since the disc is sandwiched by the brake member from both sides in the longitudinal direction of the slot portion, the pair of left and right brake members are in the vicinity of the slot portion in the housing, and the distance between the two is greater than the diameter of the disc. Must also be small.

  Therefore, the disk does not protrude greatly from the inside of the housing, and the central hole does not appear outside the housing. Therefore, when removing the disk from the slot, it is impossible to put a finger on the central hole, Therefore, there is a risk that the recorded information is deteriorated by touching the signal recording area of the disc with a finger.

  The present invention has been made in view of the circumstances as described above. The purpose of the present invention is to make it possible to remove the disc from the slot portion without damaging the signal recording area of the disc so that a part of its central hole is a slot. It is intended to prevent the disk from falling out of the slot part before being pulled out by the user while stopping at a position exposed outside the casing from the part.

  In order to achieve the above object, the present invention carries in a disk inserted into a slot portion of a casing to a predetermined drive position in the casing, and a part of the center hole of the disk at the drive position from the slot portion. A disk drive device provided with a disk transport mechanism for unloading to an eject position exposed outside the housing, wherein a disk drop prevention means for preventing the disk unloaded from the drive position to the eject position from dropping from the slot portion. The disk drop prevention means includes a disk stopper 25 that is interlocked with the disk unloading operation by the disk transport mechanism and enters the center hole of the disk at the disk ejection position. To do.

  Further, in the disk drive device configured as described above, the disk drop prevention means includes an elastic holding body 30 that holds the disk stopper 25 at the entry position and the withdrawal position with respect to the center hole of the disk. The disk stopper 25 is returned from the entry position to the withdrawal position by the extraction force when the disk is extracted, and is held without interfering with the disk.

  In addition, the disk drop prevention means has a cam gear 21 that is rotationally driven by a drive source of the disk transport mechanism, and the cam gear 21 allows the disk stopper 25 to enter the center hole of the disk. And

  According to the disk drive device of the present invention, the disk drive device includes the disk stopper that enters the center hole of the disk at the disk ejection position in conjunction with the disk unloading operation by the disk transport mechanism. While keeping the center hole exposed to the outside by increasing the amount, hold the disc in the eject position to reliably prevent the cantilevered disc from falling out of the slot due to the influence of external vibration etc. Can do.

  In particular, since the disc is in the eject position and the center hole is exposed to the outside, it is possible to remove the disc by placing the fingertip on the center hole without touching the signal recording area of the disc, and to eject the disc at the eject position. When removing the disc stopper, the disc stopper returns to the retracted position from the entry position with respect to the center hole of the disc and is held without interfering with the disc, so that the disc stopper slides on the signal recording area of the disc. Therefore, good recording / reproducing ability can be maintained for a long time without damaging the signal recording area of the disc.

  Further, since the disk stopper enters the center hole of the disk by the cam gear rotated by the drive source of the disk transport mechanism, the disk stopper can be made to perform a definite movement without malfunction.

  Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view showing a configuration example of a disk drive device according to the present invention. In FIG. 1, reference numeral 1 denotes a chassis formed by pressing a metal plate, and a seat plate 3 is provided on the chassis 1 via a leaf spring 2.

  Then, a turntable 4 for rotating the disc and a pickup (not shown) are attached to the seat plate 3 to constitute a drive unit 5 (disc drive unit generally called a traverse mechanism) for recording / reproducing music information and the like. ing. Incidentally, the turntable 4 is directly connected to a drive shaft of a spindle motor (not shown) and is driven to rotate in one direction, and a pickup (not shown) moves in the radial direction of a disk that is driven to rotate on the turntable 4 while recording information is recorded. Read and write. The chassis 1 is fixed in a housing (not shown) with its upper portion covered by a top plate (not shown), and a slit-like opening (slot portion) for loading and unloading the disk is provided on the front surface of the housing 1. ), And the disk inserted into the slot is automatically conveyed by the disk conveying mechanism inside and outside the housing.

  In the present invention, the disc loading end position by the disc transport mechanism is referred to as a drive position. At the drive position, the center of the disc and the turntable 4 coincides, and the turntable 4 and a clamp board (not shown) facing the turntable 4 are located. Thus, the center of the disk can be chucked. The end position of unloading of the disk by the disk transport mechanism is called an eject position, and about half of the center hole of the disk is exposed to the outside from the slot portion at the eject position.

  Here, the disk transport mechanism includes a pair of left and right pulling arms 6 and 7 for pulling the disk into the housing (position facing the drive unit 5), a push arm 8 for pushing the disk inside the housing to the outside, and a pulling arm. 6 and 7 and a slide member 9 for operating the push-out arm 8 and a motor 10 capable of rotating in the forward and reverse directions for driving the slide member 9. Rollers 6a and 7a that contact the end surface of the disk are provided. Further, a pressing pin 8 a that contacts the end surface of the disk is also provided at one end of the push arm 8.

  The structure of the disk transport mechanism will be described in more detail with reference to FIG. 2 and FIG. 3. The retractable arms 6 and 7 are pivotally attached to the chassis 1 by pins 11 and 12, respectively, and one end of each of them. As mentioned above, the rollers 6a and 7a are provided, and the other ends of the two are connected via two links 13 and 14, respectively. The link 14 is rotatably attached to the chassis 1 by a pin 15 and is connected to the link 13 by a connecting pin 16, and the other ends of the links 13 and 14 are respectively connected to the retracting arms 6 and 7. The connecting pins 17 and 18 are connected. As a result, the retractable arms 6 and 7 are rotated in the opposite directions through the links 13 and 14 so as to open and close each other.

  On the other hand, the push-out arm 8 is attached to a pin 11 that forms the rotation center of the pull-in arm 6 and shares the rotation center with the pull-in arm 6. Here, a torsion spring 19 is attached to the pin 11, and the torsion spring 19 biases the retractable arm 6 and the push-out arm 8 in the closing direction. That is, the retractable arm 6 is urged clockwise (disc loading direction) in FIG. 2 around the pin 11, and the pushing arm 8 is counterclockwise (disc unloading direction) in FIG. 2 around the pin 11. It is energized.

  2 and 3, the slide member 9 is a rack-like component provided on the side where the retractable arm 6 and the pushing arm 8 are arranged, and is slidably attached to the chassis 1. Yes. In particular, the slide member 9 is movable in its length direction (disc transport direction), and this includes a cam groove 9a for guiding the retracting arm 6 to rotate and a rotating guide for the pushing arm 8. A protrusion 9b is provided. Note that a cylindrical cam follower 6 b protruding from the retracting arm 6 is inserted into the cam groove 9 a, and the protrusion 9 b is in sliding contact with the side surface of the push arm 8.

  Then, according to this example, when the slide member 9 slides in the direction of the arrow in FIG. 3 (disk loading direction L1), the retractable arm 6 rotates around the pin 11 in the clockwise direction in FIG. 3, the protrusion 9 b presses the pusher arm 8, so that the pusher arm 8 turns clockwise about the pin 11 against the urging force of the torsion spring 19. . When one of the retractable arms 6 is rotated in the clockwise direction of FIG. 3 by sliding of the slide member 9, the other retractable arm 7 is rotated in the counterclockwise direction of FIG. Therefore, the interval between the rollers 6a and 7a is gradually narrowed. However, when the slide member 9 reaches the end position in the L1 direction, the rotation of the pair of retracting arms 6 and 7 is changed in the reverse direction by the action of the cam groove 9a and the links 13 and 14, and thereby the rollers 6a and 7a. Is separated from the end face of the disc.

  Here, the chassis 1 is provided with a transmission mechanism 20 between the slide member 9 and the motor 10 as shown in FIG. 2, and the power of the motor 10 is transmitted to the slide member 9 via the transmission mechanism 20. It is. The transmission mechanism 20 is a gear train having a two-stage cam gear 21 including a pinion portion 21 a, and the pinion portion 21 a constituting the cam gear 21 is meshed with the rack portion 9 c of the slide member 9. ing. The cam gear 21 constitutes a disc drop prevention means for preventing the disc carried out to the eject position by the disc transport mechanism from dropping from the slot portion, and the configuration will be described later.

  As is clear from FIGS. 2 and 3, the chassis 1 is provided with a slider 22 between a pair of left and right retracting arms 6 and 7. The slider 22 is a movable part that is slidable along the longitudinal direction of the slot portion, and is formed with a guide groove 22a that rises in an inclined manner. Further, a swing lever 24 having a pin 23 as a rotation fulcrum is stretched between the slider 22 and the slide member 9, and one end of the swing lever 24 is connected to the slider 22, and the other end of the swing lever 24 is slid. A U-shaped notch 24a that engages with a pin 9d protruding from the member 9 is formed.

  According to this example, when the slide member 9 advances in the L1 direction, the pin 9d of the slide member engages with the notch 24a of the swing lever, and the swing lever 24 rotates counterclockwise in FIG. Thus, the drive unit is lifted while the slider 22 is pulled toward the slide member 9 side.

  As is apparent from FIGS. 4 and 5, the drive unit 5 is provided with a guide pin 5a to be inserted into the guide groove 22a of the slider, so that the slider 22 moves toward the slide member 9 as described above. Then, the drive operation of the drive unit 5 is performed as shown in FIG. 5 by pushing up the guide pins 5a along the guide grooves 22a. When the slider 22 moves away from the slide member 9, the guide pin 5a is pushed down along the guide groove 22a, so that the drive unit 5 is lowered to an inclined posture while the leaf spring 2 is bent as shown in FIG. It will be. The ascending operation of the drive unit 5 is performed continuously with the disc carrying-in operation by the disc transport mechanism, and the disc is supported by the turntable 4 when the ascent of the drive unit 5 is completed (specifically, the turntable 4 faces the turntable 4). The disc is chucked in a freely rotatable manner by the clamp board). The lowering operation of the drive unit 5 is performed prior to the disk unloading operation by the disk transport mechanism. When the drive unit 5 starts to descend, the disk is replaced by the pull-in arms 6, 7 and the pushing arm 8 in place of the turntable 4. Held part.

  Next, an example of the configuration of the disk drop prevention means constituting the main part of the present invention will be described with reference to FIGS. 6 to 8. The disk drop prevention means is provided below the central portion in the longitudinal direction of the slot portion. The trigger arm 26 is stretched between the disk stopper 25 housed in the body and the cam gear 21 constituting the transmission mechanism. Among these, the cam gear 21 has a large-diameter gear portion 21b having a diameter larger than that of the pinion portion 21a, and a spiral cam groove 21c whose curvature changes at one end is formed on the flat portion. Then, one end of the trigger arm 26 is engaged with the cam groove 21c. The trigger arm 26 has a central portion attached to the chassis by a pin 27 and is rotatable about the pin 27. A driven pin 26a that engages with the cam groove 21c protrudes from one end of the trigger arm 26. The When the cam gear 21 is rotated, the trigger arm 26 is rotated around the pin 27 in the one end region of the cam groove 21c. When this is rotated clockwise in FIG. The tip of the disk stopper 25 presses the portion of the disk stopper 25 so that the disk stopper 25 is in the standing posture (retracted with respect to the center hole of the disk) shown in FIG. Position).

  The disk stopper 25 has a head portion 25a whose one end enters the center hole of the disc, and the other end is rotatably attached to the bracket 29 by a pin 28. The bracket 29 is shown in FIG. It is fixed to the chassis 1 shown.

  In particular, as apparent from FIG. 8, the bracket 29 is integrally provided with a leaf spring 30 (elastic holding body) that forms a convex portion 30 a bent in a U shape, while the disc stopper 25 has a plate. Two V-shaped concave portions 25b and 25c are formed adjacent to each other at one end portion on the fulcrum side corresponding to the convex portion 30a of the spring. Then, the convex portion 30a of the leaf spring is fitted into one concave portion 25b, whereby the disc stopper 25 is held at the retracted position (the state shown in FIG. 6) with respect to the center hole of the disc, and the convex portion 30a of the leaf spring is When fitted into the recess 25c, the disk stopper 25 is held at the entry position (the state shown in FIG. 7) with respect to the center hole of the disk.

  Here, the operation of the disk drop prevention means will be described with reference to FIG. 9. FIG. 9 (1) shows a state in which the disk D starts to be unloaded in the direction of the arrow (disk unloading direction L2) toward the eject position by the disk transport mechanism. At this time, although the cam gear 21 is in a rotating state, the trigger arm 26 is still stationary. Further, the disk stopper 25 is held in the retracted position with respect to the center hole h of the disk D, and the conveyance path is opened in the state of being close to the disk D.

  Since the cam gear 21 continues to rotate so as to direct the disk D in the unloading direction L2, the trigger arm 26 eventually turns counterclockwise in FIG. 9 around the pin 27 by the cam groove 21c (see FIG. 6) of the cam gear 21. It is rotated and comes to press the part of the disk stopper 25 at its tip. As a result, the disk stopper 25 is rotated immediately before the disk D reaches the eject position, and the leading end head portion 25a of the disk stopper enters into the center hole h of the disk passing thereabove.

  FIG. 9 (2) shows a state in which the disk stopper 25 has entered the center hole h of the disk as described above. As described above, when the disk stopper 25 enters the center hole h of the disk, the disk D is removed from the slot portion even though the disk D is in the eject position and about half of the center hole h is exposed to the outside. Is prevented. When the disk stopper 25 is rotated to the entry position with respect to the center hole h of the disk, the trigger arm 26 is rotated by one end portion of the cam groove 25c while the tip end portion is in contact with the portion of the disk stopper 25. For this reason, the disk stopper 25 is also locked at the entry position with respect to the center hole h of the disk, but such a locked state is temporary, and the disk stopper with respect to the center hole of the disk. After entering 25, this is detected by a sensor (not shown), and the cam gear 21 is reversely rotated by a certain amount, whereby the trigger arm 26 is returned to the initial state, and the tip of the disc stopper 25 is as shown in FIG. 9 (3). Separate from.

  As a result, the disk stopper 25 is in the entry position with respect to the center hole h of the disk and is allowed to return to the withdrawal position. In this state, the disk D is removed from the slot portion by placing a fingertip on the center hole h of the disk. It is possible.

  Thus, when the disk D is extracted from the slot, the disk stopper 25 is returned to the retracted position with respect to the center hole h of the disk as shown in FIG. The Rukoto. For this reason, the disk D can be suitably removed from the slot portion without bringing the disk stopper 25 into contact with the disk surface (signal recording area) of the disk D.

  Next, a disc transport operation by the disc transport mechanism will be described. First, the disk loading operation will be described with reference to FIG. 10. FIG. 10 (1) shows an initial state (before the disk is loaded). At this time, one retractable arm 6 has the cam follower 6b moved by the urging force of the torsion spring 19. The slide member is positioned while being pressed against one surface of the cam groove 9a. The other retractable arm 7 is positioned while being pressed against the wall surface of the chassis 1 through the links 13 and 14, and in this state, the distance between the left and right rollers 6a and 7a is smaller than the diameter of the disk. The push arm 8 is positioned in a state in which the push arm 8 is pressed against the projection 9b of the slide member by the torsion spring 19.

  In this state, when the disk D is inserted from the outside into the slot portion (existing on the line KT indicating the front position of the housing in FIG. 10), the end face comes into contact with the rollers 6a and 7a, but the disk D is pushed further strongly. Then, the rollers 6 a and 7 a are pushed by the pushing force, and the left and right drawing arms 6 and 7 are pushed and spread against the urging force of the torsion spring 19.

  When the center hole h of the disk passes between the rollers 6a and 7a, the end surface of the disk D comes into contact with the pressing pin 8a of the pushing arm as shown in FIG. Since the rollers 6a and 7a and the pressing pin 8a are pressed against the end face of the disk D by the action of the torsion spring 19, the disk D is supported at three points. Further, at the stage where the disk D is supported at three points by the rollers 6a and 7a of the retracting arm and the pressing pin 8a of the pushing arm, the position of the retracting arm 6 is detected by a sensor (not shown), and the disk is detected based on the detection signal. The movement of the slide member 9 in the carry-in direction L1 is started.

  Then, the pushing arm 8 is pressed on the side surface by the projection 9b of the slide member and rotated clockwise in FIG. 10, while the retracting arms 6 and 7 receive the urging force in the closing direction by the torsion spring 19 to receive the disc D. Is pushed to the extrusion arm 8 side. For this reason, the disk D is supported in three points by the rollers 6a and 7a of the retracting arm and the pressing pin 8a of the pushing arm, and is in the same loading direction L1 as the moving direction of the slide member 9 as shown in FIG. As a result, the center hole h eventually reaches a position (drive position) opposite to the turntable 4.

  FIG. 10 (3) shows a state where the disk has reached the drive position. In this state, the rotation of the retractable arms 6 and 7 is restricted by the shape of the cam groove 9a of the slide member 9, and the push arm 8 slides. The protrusion 9b of the member does not rotate clockwise in FIG. 10 but only prevents counterclockwise rotation by the torsion spring 19, so that the disk D is supported at three points while being driven to the drive position. Although it is stopped, the slide member 9 continues to be moved thereafter.

  When the movement of the slide member 9 continues even after the disk D reaches the drive position, the pin 9d of the slide member will eventually engage with the notch 24a of the swing lever as shown in FIG. The moving lever 24 pulls the slider 22 toward the slide member 9 while rotating counterclockwise in FIG.

  For this reason, the drive unit 5 is raised, and the disk D which is stopped at the drive position by the turntable 4 mounted on the drive unit 5 is supported around the center hole h, and its chucking operation (turntable and clamp disk). The center of the disc is sandwiched by As is apparent from FIG. 10, the slider 22 and the chassis 1 are linked by a toggle spring 31. When the slider 22 is positioned on the right side, a rightward biasing force is applied from the toggle spring 31 and the slider 22 is positioned on the left side. When this is done, a leftward biasing force is applied from the toggle spring 31 so that the elevation driving force of the drive unit 5 can be reduced while positioning the slider 22.

  In parallel with the disk chucking operation as described above, the retracting arm 6 rotates in the reverse direction by the cam groove 9a of the slide member 9 pressing the cam follower 6b to the right in FIG. 10 (4). In addition, when the protrusion 9b of the slide member 9 presses the side surface of the extrusion arm 8 and the rotation of the extrusion arm 8 is resumed, the rollers 6a and 7a and the pressing pin 8a as shown in FIG. Are separated from the outer peripheral end surface of the disk, and preparation for driving the disk D is completed.

  On the other hand, the disk is unloaded by an operation opposite to the above-described operation. However, at the stage where the disk transport mechanism has shifted from the state of FIG. 10 (4) to the state of FIG. 10 (2), the substantial operation of the disk drop prevention means is started.

  Specifically, even when the disk is unloaded to the position shown in FIG. 10 (2) when the disk is unloaded by the disk transport mechanism, the slide member 9 moves in the arrow direction (disk unloading direction L2) as shown in FIG. 11 (1). Keep moving. For this reason, since the projection 9b of the slide member 9 also moves in the L2 direction, the push-out arm 8 is further rotated counterclockwise as compared with the state of FIG. It will be pushed out to L2.

  When the center of the disk D passes through a straight line passing through the centers of the rollers 6a and 7a, the disk D is separated from the pressing pin 8a at this stage, and the rollers 6a and 7a are moved to the outer periphery of the disk D by the action of the torsion spring 19. It moves in the closing direction while in contact with the end face, and pushes out the disk D to the outside.

  As a result, the disk D is carried out from the slot portion (existing on the line KT indicating the front surface position of the housing as described above) to an eject position where a part (about half) of the center hole h is exposed to the outside of the housing. However, immediately before the disk D reaches the eject position, the trigger arm 26 has its one end driven pin 26a positioned at one end of the cam groove 21c of the cam gear 21 as shown in FIG. The figure is rotated clockwise. For this reason, the part of the disk stopper 25 is pressed by the tip of the trigger arm 26, and the disk stopper 25 is rotated to the entry position with respect to the center hole of the disk. As a result, the disk D is in the eject position as shown in FIG. 11 (2), and its center hole h is held by the disk stopper 25, thereby preventing the disk D from dropping out of the slot portion.

  As described above, immediately after the disk stopper 25 enters the disk center hole h, the slide member 9 is changed in the moving direction to the L1 direction by the reverse rotation of the cam gear 21, and FIGS. 10 (2) and 11 (3). However, at this stage, the disk D can be removed from the slot portion as shown in FIG. 11 (3). 25 is returned to and held in the retracted position with respect to the center hole of the disc, and the disc transport path is opened.

  Although the present invention has been described above, the present invention can be applied to various disk drive devices such as a CD player, a DVD recorder, or a car navigation DVD player. The disc is not limited to a CD or DVD, but may be a Blu-ray or an HD-DVD disc. Of course, the optical disk is not limited to an optical disk.

The perspective view which shows the internal structure of the disk drive device based on this invention The perspective view which shows the disc conveyance mechanism in the apparatus A perspective view of the disk transport mechanism with the chassis omitted. A perspective view showing a drive unit for driving a disk (lowered state) A perspective view showing the drive unit (upward state) The perspective view which shows the structural example of a disk dropout prevention means A perspective view showing a state in which the disk stopper enters the disk center hole Perspective exploded view of the disk stopper Operation explanatory diagram of disk drop prevention means Explanatory drawing showing disk loading operation Explanatory drawing showing the disc ejection operation

Explanation of symbols

4 Turntable 5 Drive unit 6, 7 Pull-in arm 8 Push-out arm 9 Slide member 19 Torsion spring 21 Cam gear 22 Slider 25 Disc stopper 26 Trigger arm 30 Plate spring (elastic holding body)

Claims (3)

The disc inserted in the slot portion of the housing is carried to a predetermined drive position in the housing, and the disc at the drive position is carried out to an eject position where a part of the central hole is exposed outside the housing from the slot portion. A disk drive device equipped with a disk transport mechanism,
A disk drop prevention means for preventing the disk carried from the drive position to the eject position from dropping from the slot portion;
The disk drop prevention means includes a disk stopper that is interlocked with the disk unloading operation by the disk transport mechanism and enters the center hole of the disk at the disk ejection position. .   The disk drop prevention means has an elastic holding body that holds the disk stopper at the entry position and the withdrawal position with respect to the center hole of the disk, and the disk stopper is moved away from the entry position by the extraction force when the disk is extracted at the eject position. 2. The disk drive device according to claim 1, wherein the disk drive device is returned to the retracted position and is held without interfering with the disk. 3. The disk drop prevention means has a cam gear that is rotationally driven by a drive source of a disk transport mechanism, and the cam gear allows the disk stopper to enter the center hole of the disk. Disk drive.

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