JP5771014B2 - Disk unit - Google Patents

Description

The present invention relates to a disk apparatus having a cam mechanism in which the first groove portion and the substantially cylindrical engaging pins bent shape and is cam groove continuous through the second groove and the bent portion slides In particular, the present invention relates to a disk device having a cam mechanism that can set the timing when the engagement pin moves from the first groove portion to the second groove portion through the bent portion of the cam groove with high accuracy. It is.

  When a disc is inserted into a slot provided in the front of the device in an in-vehicle disc device, etc., the drive force of the motor is transmitted to the transport mechanism, and the disc is transported to the inside of the device. When transported, the driving force of the motor is transmitted to the power switching mechanism to move the slider, whereby the disk transport operation is stopped and the turntable and the clamper perform the disk chucking operation. There is something configured as follows.

  As an example of the disk device that can perform the disk transport operation and the chucking operation with the driving force of one motor as described above, a reversing spring is used as a component of the power switching mechanism. Those designed to connect and disconnect power by spring force are known. However, since it is difficult to avoid variations in the spring force of the reversing spring, the power switching mechanism using the reversing spring has a drawback in that the timing of coupling and disconnecting power tends to vary.

  Therefore, conventionally, a disk device has been proposed in which a power switching mechanism is configured using a cam mechanism instead of the reversing spring, thereby stabilizing the timing of coupling and decoupling of power (for example, patents). Reference 1). This cam mechanism has two rotating members that can rotate coaxially with partial teeth, a trigger member for starting one rotating member, and a link member that links the operations of both rotating members. And.

  Hereinafter, the conventional cam mechanism will be briefly described. The trigger member is driven directly or indirectly by a disk conveyed to a predetermined position to rotate, and rotates one rotating member by a predetermined amount. This rotating operation is performed without pushing in the link member, and the partial teeth of one rotating member are engaged with a gear that continues to rotate by the driving force of the motor. Thereafter, one of the rotating members is rotated by the driving force of the motor, and the columnar engaging pin of the link member pushed into the rotating member is inserted into the cam groove provided in the fixing member such as the chassis. It moves toward the bent portion of the cam groove while being guided. When the engaging pin reaches the bent portion of the cam groove, the engaging pin moves along the cam groove while pushing the other rotating member while greatly changing the traveling direction. Thus, when the other rotating member rotates by a predetermined angle, the gear engages with the gear, so that the rotating member is rotated by the driving force of the motor. The slider link connecting the sliders lifts the drive base. As the slider moves forward, the transport roller is pushed down to move away from the lower surface of the disk, and the clamp base is lowered by the urging force of the pressing urging member. And the turntable are sandwiched from above and below to complete chucking.

JP 2008-130172 A

  By the way, in the disk device provided with the cam mechanism as disclosed in Patent Document 1, when the loaded disk is transported to a predetermined position, as shown in FIGS. The provided cylindrical engagement pin 101 reaches the bent portion 111a of the cam groove 111 provided in the fixing member 110 such as the chassis and greatly changes the traveling direction. At this time, there is no problem if the center of the engaging pin 101 moves along an ideal locus parallel to the sliding wall surface 111b of the cam groove 111. It has been found that when the engaging pin 101 that is driven and moved (shown at 120) passes through the bent portion 111a, the center of the engaging pin 101 deviates from an ideal locus parallel to the sliding wall surface 111b. That is, in the explanatory view shown in FIG. 38, when an ideal locus parallel to the sliding wall surface 111b is represented by a dashed line Q, the center of the engagement pin 101 is the ideal locus when the engagement pin 101 passes through the bent portion 111a. Since it moves along a path shorter than Q (illustrated by a broken line), this engaging pin 101 starts the other rotating member (indicated by reference numeral 121) earlier, and thus the rotating member 121 is The timing of meshing with the gear (indicated by reference numeral 113) will be accelerated. In particular, when such a cam mechanism is used as the power switching means of the disk device, the partial teeth 112a of the rotating member 121 remain displaced from the partial teeth 120a of the rotating member 120 as shown in FIG. Since the gear 113 is forced to jump into the tooth groove 113a, a problem arises that an unpleasant noise is generated due to a shift in the drive timing of the engagement pin 101.

The present invention has been made in view of the actual situation of the prior art as described above, and the purpose thereof is when the engaging pin moves from the first groove portion to the second groove portion through the bent portion of the cam groove. it is to provide a disk apparatus having a cam mechanism capable of setting the timing with high accuracy.

To achieve the above object, the present invention provides a disk apparatus in which the conveying operation and the chucking operation of the disk is selectively performed by switching the transmission path of driving force of a single motor, the motor The first rotating member having first partial teeth that can mesh with a gear to which the driving force is constantly transmitted, and the second rotating teeth having second partial teeth that can mesh with the gear. A second rotating member that is coaxially rotatable, a trigger member that is driven by a disk being conveyed to start the second rotating member, and can be driven by the second rotating member. A link member having a substantially cylindrical engagement pin capable of driving the first rotation member; and a fixing member having a cam groove for sliding the engagement pin, wherein the cam groove is a first groove portion. And the second groove part bends continuously through the bent part. The engaging pin reciprocates between the first groove portion and the second groove portion while being in sliding contact with the sliding wall surface of the cam groove, and the engaging pin slides on the bent portion. In the disk device in which the moving direction of the first member with respect to the fixed member is switched when passing through a bent portion that is a wall surface, the bent portion is a sliding wall surface of the first groove portion and a second groove portion. The sliding wall surface of the first groove portion and the sliding wall surface of the second groove portion are bent with an internal angle exceeding 0 ° and less than 180 °, A built-up portion is provided on a part of the outer peripheral surface of the engaging pin, and when the engaging pin passes through the bent portion, the built-up portion is arranged such that the top of the built-up portion becomes the bent portion. It is formed at the position where it comes into sliding contact, and the top of the build-up part is in contact with the bent part. The center of the engagement pin excluding the build-up portion is a parallel line separated from the radius of the engagement pin excluding the build-up portion from the sliding wall surface of the entire first groove portion and the entire second groove portion. The center of the engagement pin and the top of the build-up portion are positioned at the intersection of each extension line with the parallel separated line of the engagement pin except for the build-up portion from the sliding wall surface The distance between the second rotating member and the gear is engaged with the second rotating portion of the second partial teeth while the second partial teeth are engaged with the gear. The engaging pin moves toward the bent portion while slidingly contacting the sliding wall surface of the first groove portion, and the top portion of the build-up portion passes through the bent portion and then the first pin is moved by the engaging pin. When the first rotating member is driven and the first rotating member rotates by a predetermined angle Was constructed such that the first partial tooth is engaged with the gear transmission path of the driving force of the motor is switched the chucking operation is performed.

  In the disk device configured as described above, when the engaging pin of the link member driven by the second rotating member passes the bent part of the cam groove during the disk transport, the movement locus of the center of the engaging pin is Since the center of the engagement pin is moved on an ideal locus parallel to the sliding wall surface and is corrected based on the protruding amount of the build-up portion, the engagement pin passes through the bent portion of the cam groove and the first The timing when moving from the groove portion to the second groove portion can be set with high accuracy. Thereby, since there is no possibility that the start of the first rotating member driven by the engaging pin is accelerated, the partial teeth of the first rotating member are engaged with the gear driven by the motor at a predetermined timing. be able to.

  In the disk device having the above-described configuration, the shape of the build-up portion is not particularly limited, but a pair of surfaces connected from both sides of the top portion of the build-up portion to the outer peripheral surface of the engagement pin are flat surfaces. When each plane is in a shape located on the tangent line of the outer peripheral edge of the engagement pin, when the engagement pin moves in the cam groove by being driven by the second rotating member, This is preferable because it is easy to stably slide on the sliding wall surface.

  In this case, if the inner angle of the corner formed by the pair of surfaces connected to the outer peripheral surface of the engagement pin from both sides of the top portion of the built-up portion coincides with the inner angle of the bent portion of the cam groove, It is preferable because the center movement locus can be brought as close as possible to the ideal locus.

  In the disc device according to the present invention, when the engaging pin of the link member driven by the second rotating member passes the bent portion of the cam groove while the disc is transported, the movement trajectory at the center of the engaging pin is the build-up portion. Since the center of the engagement pin is moved on an ideal locus parallel to the sliding wall surface, the engagement pin passes through the bent portion of the cam groove and the first groove portion is corrected. The timing when moving to the second groove can be set with high accuracy. Thereby, since there is no possibility that the start of the first rotating member driven by the engaging pin is accelerated, the partial teeth of the first rotating member are engaged with the gear driven by the motor at a predetermined timing. Therefore, the transmission path of the driving force of the motor can be always switched at a specified timing during the conveyance of the disk, and there is no possibility of generating abnormal noise.

It is a disassembled perspective view which shows the cam mechanism of the disc apparatus based on the embodiment of this invention. It is explanatory drawing which shows the state just before the trigger member shown in FIG. 1 starts a 2nd rotation member. It is explanatory drawing which shows the state immediately before the 2nd rotation member driven by the trigger member shown in FIG. 2 meshes with the gear by the side of a motor. It is explanatory drawing which shows the state immediately after the 2nd rotation member shown in FIG. 3 meshed | engaged with the gear by the side of a motor. It is explanatory drawing which shows the state which the 2nd rotation member shown in FIG. 4 rotated a little with the drive force of the motor. It is explanatory drawing which shows the state which the 2nd rotation member shown in FIG. 5 rotated to the rotation end position vicinity. It is a perspective view which shows the front and back both surfaces of the 2nd rotation member shown in FIG. It is a perspective view which shows the front and back both surfaces of the 1st rotation member shown in FIG. It is a perspective view which shows the front and back both surfaces of the link member shown in FIG. It is explanatory drawing which shows a 1st rotation member and a link member when a 2nd rotation member exists in the state shown in FIG. It is explanatory drawing which shows a 1st rotation member and a link member when a 2nd rotation member exists in the state shown in FIG. It is explanatory drawing which shows the state immediately before starting the link member shown in FIG. 11 driven by the 2nd rotation member. It is explanatory drawing which shows the state just before starting the 1st rotation member shown in FIG. 12 driven by a link member. It is explanatory drawing which shows the state which the 1st rotation member shown in FIG. 13 rotated to the rotation completion position. It is explanatory drawing which shows the state which the engagement pin of a link member has engaged in the initial position in the cam groove shown in FIG. It is explanatory drawing which shows the state which the engagement pin moved to the bending part in the cam groove shown in FIG. It is explanatory drawing which shows the state which the engagement pin moved to the terminal end in the cam groove shown in FIG. It is a top view which shows the power transmission unit of the disc apparatus which concerns on the example of this embodiment. It is a perspective view of the bracket for motor holding shown in FIG. It is a top view of the power transmission unit which removes the motor holding bracket from FIG. 18 and shows the internal structure. It is explanatory drawing which shows the various gears used for the conveyance operation of a disk among the gear groups shown in FIG. It is explanatory drawing which shows the various gears used for the chucking operation | movement of a disk among the gear groups shown in FIG. It is a principal part enlarged view of FIG. It is explanatory drawing which shows the state by which the build-up part of the engagement pin shown in FIG. 23 is position-regulated in the bending part vicinity of the sliding wall surface of a cam groove. FIG. 25 is an explanatory diagram showing a state immediately before the build-up portion of the engagement pin shown in FIG. 24 gets over the bent portion of the sliding wall surface of the cam groove. It is explanatory drawing which shows the state immediately after the build-up part of the engagement pin shown in FIG. 25 got over the bending part of the sliding wall surface of a cam groove. It is a principal part enlarged view of FIG. It is a principal part enlarged view of FIG. It is a principal part enlarged view of FIG. It is a principal part enlarged view of FIG. It is explanatory drawing which shows the movement locus | trajectory of the engaging pin in the example of this embodiment. It is principal part explanatory drawing of the cam mechanism which concerns on the other Example of this invention. It is explanatory drawing of the build-up part of the engagement pin shown in FIG. It is operation | movement explanatory drawing of the prior art example which shows the state which the engagement pin has engaged with the initial position in a cam groove. It is operation | movement explanatory drawing which shows the state just before the engaging pin shown in FIG. 34 arrives at the bending part in a cam groove. It is operation | movement explanatory drawing which shows the state which the engagement pin shown in FIG. 35 reached | attained the bending part in a cam groove. It is operation | movement explanatory drawing which shows the state which the engagement pin shown in FIG. 36 rolled undesirably. It is explanatory drawing which shows the movement locus | trajectory of the engagement pin in a prior art example.

  Hereinafter, a cam mechanism (power switching mechanism) of a disk device according to an embodiment of the present invention will be described with reference to the drawings. First, a power transmission unit including this cam mechanism will be described with reference to FIGS. The internal structure of the power transmission unit is shown in FIG. 20, and the state where the motor holding bracket (see FIG. 19) is removed from FIG. 18 corresponds to FIG. Also, in the gear group shown in FIG. 20, various gears used for the disk transport operation are shown in FIG. 21, and various gears used for the disk chucking operation are shown in FIG.

  The disk device according to the present embodiment is an in-vehicle device that can be loaded with a disk such as a CD or a DVD. A frame-shaped external chassis 1 of this disk device is integrated with a base member 2 which is a fixed member. Inside the external chassis 1, a power transmission unit 3, a switching motor 4, a transport roller 5, a drive unit (not shown), A mechanism unit including a clamp unit and an optical pickup unit is accommodated. Further, a nose portion (not shown) provided with a liquid crystal display portion and switches is provided on the front side of the disc device, and a slot (disc insertion slot) for inserting and removing a disc into the nose portion is provided. It has been established.

  The disk device according to the present embodiment can perform an operation of transporting the disk into the device and an operation of chucking the disk after transport by the driving force of the single switching motor 4. The transmission path of the driving force of the switching motor 4 is switched by the cam mechanism 6 included in the power transmission unit 3.

  That is, when it is detected that a disk is inserted into the slot, the switching motor 4 starts to rotate in one direction based on the detection signal. As shown in FIG. 21, the driving force of the switching motor 4 is transmitted from the worm gear 30 to the gears 32, 33, 34 via the main gear 31, and is further attached to the motor holding bracket 7 (see FIG. 21). 18), the gear 50 is attached to the roller shaft of the conveying roller 5. As a result, the transport roller 5 rotates with the disk sandwiched between the slide members (not shown), and the disk inserted into the slot is transported to the back of the apparatus by this rotational force.

  When the disk is transported to a predetermined position in the apparatus, the trigger member 60 of the cam mechanism 6 is pressed by the disk and rotates, so that the trigger member 60 rotates and drives a second rotating member 62 described later. The second rotating member 62 meshes with the main gear 31 to drive the engaging pin 64 of the link member 63, whereby the first rotating member 61 starts to rotate. When the first rotating member 61 rotates by a predetermined angle, the first rotating member 61 meshes with the main gear 31 and rotates with the driving force of the switching motor 4, so that the driving force of the switching motor 4 is the first driving force as shown in FIG. 1 is transmitted to the left lock member 38 through the gears 36 and 37, and is transmitted from the gear 37 to the right lock member 42 through the lever 39, the slider link 40, and the lever 41. As a result, the left and right lock members 38 and 42 advance the left slider 43 and the right slider 44, and the slider link 40 connecting the sliders 43 and 44 lifts the drive base of the drive unit (not shown). As a result, as the left and right sliders 43 and 44 move forward, the conveying roller 5 is pushed down and separated from the lower surface of the disk, and the clamp base of the clamp unit (not shown) is lowered by the urging force of the pressing urging member. Therefore, the peripheral edge of the center hole of the disc is sandwiched from above and below by the clamper and the turntable, and the chucking is completed.

  The motor holding bracket 7 shown in FIG. 19 is integrated with the base member 2 which is a fixing member. The motor holding bracket 7 includes a motor holding portion 70 for positioning the switching motor 4 and the link member. A cam groove 71 serving as a moving path of 63 engaging pins 64 is provided.

  Next, the cam mechanism 6 according to the present embodiment will be described in detail. As shown in FIG. 1, the cam mechanism 6 includes a first rotating member 61 having a partial tooth 61a, a second rotating member 62 having a partial tooth 62a, and the second rotating member 62. A trigger member 60 to be started, a link member 63 having a substantially cylindrical engaging pin 64, and a cam groove 71 having a substantially G shape in plan view for guiding the movement of the engaging pin 64 are provided. Is provided on the motor holding bracket 7. As will be described later, the first and second rotating members 61 and 62 are rotatable about the support shaft 45 as a rotating shaft. The second rotating member 62 can drive the engaging pin 64, and the engaging pin 64 can drive the first rotating member 61. 7A and 7B show both front and back surfaces of the second rotating member 62, and FIGS. 8A and 8B show both front and back surfaces of the first rotating member 61. FIG. FIGS. 9A and 9B show both front and back surfaces of the link member 63.

  A shaft portion 63a projecting from the back surface of the link member 63 is pivotally supported by a round hole 61b provided in the first rotating member 61, and the link member 63 is centered around the shaft portion 63a. The movable member 61 can be rotated. The engaging pin 64 protrudes in the opposite direction from both the front and back surfaces of the link member 63, and a portion protruding from the front surface side of the engaging pin 64 is inserted into the cam groove 71 and a portion protruding from the back surface side. The first rotation member 61 is inserted into the elongated hole 61 c and the second rotation member 62 is inserted into the cam hole 62 c. As is apparent from FIG. 9A, a built-up portion 64a is formed on one side portion of the outer peripheral surface of the engagement pin 64 on the surface side of the link member 63, and this built-up portion 64a is a cam. The groove 71 is in sliding contact with the sliding wall surface 71a. As shown in FIGS. 1 and 23 to 26, the cam groove 71 provided in the motor holding bracket 7 is formed by bending a short first groove 71b and a long second groove 71c. The bent wall 71a is bent by approximately 90 degrees at the bent portion 71d.

  The first and second rotating members 61 and 62 are rotatable coaxially, and a support shaft 45 that is a rotating shaft thereof is erected on the base member 2 (see FIG. 1). The rotation center of both the rotating members 61 and 62 coincides with the center of the circle along the second groove portion 71c of the cam groove 71. Further, as shown in FIG. 7B, a substantially J-shaped cam groove 62 b serving as a movement path of the drive pin 60 b of the trigger member 60 is provided on the back surface of the second rotating member 62. As shown in FIGS. 2 to 6, the trigger member 60 is rotatable about a shaft portion 60 a. The trigger member 60 is rotated counterclockwise in FIG. 2 when the driven portion 60c is pushed into the loaded disk, and the drive pin 60b drives and rotates the second rotating member 62 accordingly. It has become.

  The partial teeth 61a and 62a of the first and second rotating members 61 and 62 can mesh with the main gear 31 to which the driving force of the switching motor 4 is constantly transmitted. However, after the second rotating member 62 is driven by the trigger member 60 and rotated by a predetermined amount, the second rotating member 62 is engaged with the main gear 31, and after the first rotating member 61 is driven by the engagement pin 64 and rotated by a predetermined amount. Engages with the main gear 31. As described above, when the partial teeth 61a of the first rotating member 61 are engaged with the main gear 31 when the disk is transported, the driving force of the switching motor 4 is not transmitted to the transporting roller 5, and the switching motor 4 is driven. The disk is chucked by force.

  The build-up portion 64a provided on the engagement pin 64 of the link member 63 is a timing when the engagement pin 64 moves from the first groove portion 71b to the second groove portion 71c through the bent portion 71d of the cam groove 71. The center of the engaging pin 64 is moved on the ideal locus Q parallel to the sliding wall surface 71a by the built-up portion 64a. That is, as is apparent from the explanatory diagram of FIG. 31, the overlaid portion 64a shown in black in the same drawing passes through the bent portion 71e where the engaging pin 64 is the sliding wall surface of the bent portion 71d of the cam groove 71. In this case, the top portion of the built-up portion 64a is formed at a position where it slides on the bent portion 71e. Further, when the top of the built-up portion 64a contacts the bent portion 71e, the center of the engaging pin 64 excluding the built-up portion 64a removes the built-up portion 64a from the sliding wall surface 71a of the first groove 71b. The extension lines of the parallel separated line q1 of the engaging pin 64 and the separated parallel line q2 of the engaging pin 64 excluding the build-up portion 64a from the sliding wall surface 71a of the second groove 71c. The distance between the center of the engaging pin 64 and the top of the built-up portion 64a is set so as to be located on the intersection point O. In addition, the line shown with the dashed-dotted line Q which connected these parallel lines q1 and parallel lines q2 represents the ideal locus | trajectory Q parallel to the sliding wall surface 71a mentioned above.

  Specifically, as shown in FIG. 25, the radius of the engaging pin 64 excluding the build-up portion 64a is r, and the center of a quadrant with a radius r and a central angle of 90 degrees, In this embodiment, when the length of the line segment connecting the point P where two tangent lines passing through both ends of the arc of the dividing circle intersect is L, the protrusion amount of the built-up portion 64a of the engagement pin 64 is ( L−r). However, it is preferable that the shape and the protruding amount of the built-up portion 64a are appropriately set depending on the shape of the bent portion 71e formed in the cam groove 71 on which the engagement pin 64 slides. Further, as shown in FIG. 24, the surface connecting from the top portion of the build-up portion 64a to the outer peripheral surface of the engaging pin 64 is a flat portion 64b, and these flat portions 64b are respectively the outer peripheral edges of the engaging pin 64. It is located on the tangent line. Thereby, when the engaging pin 64 moves in the first groove 71b, the one flat surface portion 64b is brought into sliding contact with the sliding wall surface 71a in a surface contact state, and the engaging pin 64 is in the second groove portion 71c. When moving inside, the other flat surface portion 64b can be brought into sliding contact with the sliding wall surface 71a in a surface contact state, and the built-up portion 64a can be easily slid stably with respect to the sliding wall surface 71a. ing.

  Next, the operation of the cam mechanism 6 according to the present embodiment will be described in more detail with reference to FIGS. 2 to 6 and FIGS. 10 to 30 and FIG.

  In a standby state in which no disc is inserted, the trigger member 60 and the second rotating member 62 are in a relative positional relationship as shown in FIG. 2, and the first rotating member 61 and the link member 63 are not shown. 27 and the partial teeth 61 a and 62 a of the rotating members 61 and 62 are not meshed with the gear 31. At this time, the engaging pin 64 of the link member 63 is located at the end of the cam groove 71 on the first groove 71b side, as shown in FIGS.

  When it is detected by a sensor (not shown) that a disk has been inserted into the slot, the switching motor 4 starts to rotate in one direction based on the detection signal. When the disk is conveyed to a predetermined position, the disk pushes the driven portion 60c of the trigger member 60 to the back side of the apparatus, so that the trigger member 60 rotates counterclockwise in FIG. As the trigger member 60 rotates, the drive pin 60b engaged with the cam mechanism 62b rotates the second rotating member 62 clockwise in FIG. When the second rotating member 62 rotates by a predetermined amount in this way, the partial teeth 62a of the second rotating member 62 jump into the tooth groove 31a of the main gear 31 and mesh as shown in FIGS. become. In addition, the structure may be such that the disc conveyed to a predetermined position does not directly push the trigger member 60 but pushes the trigger member 60 indirectly through another member.

  Even if the second rotating member 62 rotates from the state shown in FIG. 2 to the state shown in FIG. 3, the cam hole 62c of the second rotating member 62 does not bias the engaging pin 64 during that time. Stops and does not rotate. That is, when the disc is not inserted, as shown in FIG. 27, the engaging pin 64 is inserted into one end portion on the inner peripheral side of the substantially heart-shaped cam hole 62c (see FIG. 2). Even when the second rotating member 62 rotates until the state shown in FIG. 28 is reached, the engagement pin 64 is not driven because the inner peripheral side portion of the cam hole 62c extends along the rotation direction, and the cam hole 62c is not driven. Only the position of the engagement pin 64 inside changes. When the second rotating member 62 rotates to the state shown in FIG. 4 and meshes with the main gear 31, as shown in FIG. 29, the engaging pin 64 is a portion extending along the substantially radial direction in the cam hole 62c. Therefore, the engaging pin 64 is driven to rotate clockwise in FIG. 29 as the second rotating member 62 rotates. Thereafter, the engaging pin 64 moves radially outward in the elongated hole 61c of the first rotating member 61 while being guided radially outward in the cam hole 62c. Starts to rotate relative to the first rotating member 61. Therefore, the first rotating member 61 has not yet started rotating.

  3 corresponds to the operation states of FIGS. 11 and 28, and the operation state of FIG. 4 corresponds to the operation states of FIGS.

  Thereafter, the second rotating member 62 meshed with the main gear 31 continues to rotate clockwise in FIG. 4 by the driving force of the switching motor 4, and accordingly, the engaging pin 64 in the cam hole 62c is moved to the first position. The second rotating member 62 is driven to move radially outward in the long hole 61 c of the first rotating member 61. In this process, the engagement pin 64 protruding to the surface side of the link member 63 shifts from the state shown in FIGS. 12 and 29 to the state shown in FIGS. 13 and 30. That is, as apparent from FIGS. 23 to 25, the engagement pin 64 moves from the first groove portion 71 b toward the bent portion 71 d in the cam groove 71 of the motor holding bracket 7, and the engagement pin 64. The built-up portion 64a moves toward the bent portion 71e while bringing one flat surface portion 64b into sliding contact with the sliding wall surface 71a of the first groove portion 71b.

  Then, when the engagement pin 64 moves to the bent portion 71d, the top portion of the built-up portion 64a reaches the bent portion 71e of the sliding wall surface 71a. The pin 64 greatly changes the traveling direction relative to the cam groove 71 from the first groove 71b to the second groove 71c. Thereafter, the engaging pin 64 advances while the other flat surface portion 64b is brought into sliding contact with the sliding wall surface 71a of the second groove portion 71c, and the first rotating member 61 is moved through the engaging pin 64 to the first position. The second rotating member 62 is connected. Therefore, the second rotating member 62 that rotates in mesh with the main gear 31 rotates the first rotating member 61 via the engagement pin 64.

  24 to 26 and FIG. 31 show a change in the position of the engagement pin 64 in the cam groove 71 when the built-up portion 64a gets over the bent portion 71e. As shown in FIG. 31, when the top portion of the built-up portion 64a of the engagement pin 64 is in contact with the bent portion 71e, the center of the engagement pin 64 excluding the built-up portion 64a is slid in the first groove portion 71b. Radial separation of the parallel line q1 of the engagement pin 64 excluding the build-up portion 64a from the moving wall surface 71a and the engagement pin 64 of the sliding wall surface 71a of the second groove 71c excluding the build-up portion 64a. The protruding amount of the built-up portion 64a (distance L between the center of the engaging pin 64 and the top of the built-up portion 64a) is set so as to be positioned on the intersection point O of each extension line with the parallel line q2. Therefore, when the engaging pin 64 passes through the bent portion 71e, the movement locus of the center of the engaging pin 64 is corrected based on the protruding amount of the built-up portion 64a. Accordingly, as shown by the one-dot chain line in FIGS. 26 and 31, the movement locus of the center of the engaging pin 64 in the cam groove 71 is along the ideal locus Q parallel to the sliding wall surface 71a. The timing when the coupling pin 64 moves from the first groove portion 71b to the second groove portion 71c through the bent portion 71d of the cam groove 71 can be set with high accuracy.

  Thus, when the engaging pin 64 moves into the second groove 71c of the cam groove 71 and the first and second rotating members 61 and 62 rotate integrally, both the rotating members 61, The 62 partial teeth 61a and 62a overlap each other. And when the 1st rotation member 61 rotates a predetermined angle, the partial tooth | gear 61a will jump into the tooth groove 31a of the main gear 31, and will mesh. That is, since the driving force of the switching motor 4 is transmitted to the first rotating member 61, the left and right lock members 38, 42 are moved to the left along with the rotating operation of the first rotating member 61. While the slider 43 and the right slider 44 are advanced, the slider link 40 lifts the drive base of the drive unit (not shown). As a result, the roller shaft is pushed down, the conveying roller 5 is separated from the lower surface of the disk, and the clamp base of the clamp unit (not shown) is lowered, so that the peripheral edge of the center hole of the disk is The chucking is completed by being sandwiched from above and below.

  6 shows a state in which the second rotating member 62 has been rotated to the vicinity of the rotation end position, and FIG. 14 shows a state in which the first rotating member 61 has been rotated to the rotation end position.

  Further, when the disk loaded in the disk device is ejected, the switching motor 4 is started in a direction opposite to that when the disk is loaded by the ejection command operation, so that the first and second rotating members 61 and 62 are started. Rotates counterclockwise from the state shown in FIG. Thereafter, the first rotating member 61 and the main gear 31 are disengaged from each other. However, while the second rotating member 62 is engaged with the main gear 31, both the rotating members 61 and 62 are engaged. Are connected via the engaging pin 64, the first rotating member 61 rotates counterclockwise until it returns to the state shown in FIG. 13 even after the meshing with the main gear 31 is released. Go. Then, when the second rotating member 62 rotates by a predetermined amount, the first rotating member 61 returns to the state shown in FIG. 13 and does not rotate. Thereafter, the second rotating member 62 and the main gear 31 are stopped. Until the engagement is released, the engagement pin 64 is driven by the second rotating member 62 and moves inward in the long hole 61c in the radial direction. Thereafter, when the meshing between the second rotating member 62 and the main gear 31 is released, the first rotating member 61 and the second rotating member 61 are interposed between the two rotating members 61 and 62 in the opposite direction along the circumferential direction. An elastic member (not shown) which is elastically biased to rotate the second rotating member 62 counterclockwise from the state shown in FIG. As a result, the second rotating member 62 is pushed back to the state shown in FIG. 2 without driving the engagement pin 64, and the trigger member 60 is also pushed back to the state shown in FIG.

  As described above, in the cam mechanism 6 provided in the disk device according to the present embodiment, the engaging pin 64 of the link member 63 driven by the second rotating member 62 during the disk conveyance is provided in the cam groove 71. When passing through the bent portion 71d, the movement trajectory of the center of the engaging pin 64 is corrected based on the protruding amount of the built-up portion 64a provided on the outer peripheral surface of the engaging pin 64, so that it is parallel to the sliding wall surface 71a. The center of the engagement pin 64 moves on the ideal locus Q. Thereby, since the timing when the engaging pin 64 moves from the first groove portion 71b to the second groove portion 71c through the bent portion 71d of the cam groove 71 can be set with high accuracy, the switching motor 4 The partial teeth 61a of the first rotating member 61 can be meshed with the main gear 31 driven at a predetermined timing. Therefore, by adopting such a cam mechanism 6, it is possible to always switch the transmission path of the driving force of the switching motor 4 at the specified timing when the disk is transported, and there is no possibility of generating abnormal noise.

  A pair of surfaces connected from both sides of the top portion of the build-up portion 64a to the outer peripheral surface of the engagement pin 64 is a flat portion 64b, and each of the flat portions 64b is on a tangent line of the outer peripheral edge of the engagement pin 64 Therefore, when the engagement pin 64 is moved in the first groove 71b by being driven by the second rotating member 62, one plane of the built-up portion 64a is formed on the sliding wall surface 71a. When the engaging pin 64 passes through the bent portion 71e and moves in the second groove portion 71c, the other plane of the built-up portion 64a is brought into contact with the sliding wall surface 71a. The portion 64b can be slidably contacted in a surface contact state, and the built-up portion 64a can be stably slid relative to the sliding wall surfaces 71a of the first and second groove portions 71b and 71c.

  FIG. 32 is an explanatory view of a main part of a cam mechanism 6 according to another embodiment of the present invention. In the cam groove 71 provided in the cam mechanism 6, the first groove 71b and the second groove 71b of the cam groove 71 are shown. The groove portion 71c is formed in a bent shape with a bent portion 71d and the sliding wall surfaces 71a are bent with an obtuse angle (inner angle θ). Also in this cam mechanism 6, a built-up portion 64 a is provided on the outer peripheral surface of the engaging pin 64 that moves in the cam groove 71, but as shown in FIG. 33, from the top of this built-up portion 64 a. The inner angle formed by the pair of flat portions 64b connected to the outer peripheral surface of the engagement pin 64 and the inner angle θ of the bent portion 71e formed by each sliding wall surface 71a of the bent portion 71d are set to be the same. Yes.

  If comprised in this way, when the one plane part 64b of the build-up part 64a slides on the sliding wall surface 71a of the 1st groove part 71b and passes the bending part 71e, the other plane part of the build-up part 64a 64b smoothly slides on the sliding wall surface 71a of the second groove portion 71c, so that when the engaging pin 64 passes through the bent portion 71e of the cam groove 71, the built-up portion 64a is replaced with the first and second groove portions. It can be made to slide stably with respect to each sliding wall surface 71a of 71b and 71c.

1 External chassis 2 Base member (fixing member)
3 Power Transmission Unit 4 Switching Motor 5 Carrying Roller 6 Cam Mechanism 7 Motor Holding Bracket 31 Main Gear (Gear)
38, 42 Lock member 40 Slider link 43, 44 Slider 45 Support shaft 60 Trigger member 60b Drive pin 60c Driven portion 61 First rotation member 61a Partial teeth 61c Long hole 62 Second rotation member 62a Partial teeth 62b Cam Groove 62c Cam hole 63 Link member 63a Shaft part 64 Engagement pin 64a Overlaying part 64b Plane part 71 Cam groove 71a Sliding wall surface 71b First groove part 71c Second groove part 71d Bending part 71e Bending part

Claims (3)

A disk device in which a disk transport operation and a chucking operation are selectively performed by switching a transmission path of a driving force of a single motor, and can be engaged with a gear that constantly transmits the driving force of the motor. A first rotating member having a first partial tooth and a second rotating member having a second partial tooth meshable with the gear and capable of rotating coaxially with the first rotating member. A trigger member that is driven by the disk being transported to start the second rotating member; and a substantially circle that can be driven by the second rotating member and that can drive the first rotating member. A link member having a columnar engagement pin; and a fixing member having a cam groove for sliding the engagement pin, wherein the cam groove has a first groove portion and a second groove portion continuous through a bent portion. The engaging pin is in the cam groove Reciprocating between the first groove portion and the second groove portion while being in sliding contact with the sliding wall surface, and when the engagement pin passes through the bent portion which is the sliding wall surface of the bent portion, the fixing In the disk device in which the moving direction of the first member relative to the member is switched,
The bent portion is a contact point between the sliding wall surface of the first groove portion and the sliding wall surface of the second groove portion, and the sliding wall surface of the first groove portion and the sliding wall surface of the second groove portion are The inner angle is bent with an angle greater than 0 ° and less than 180 °,
A built-up portion is provided on a part of the outer peripheral surface of the engaging pin, and when the engaging pin passes through the bent portion, the built-up portion is arranged such that the top of the built-up portion is the bent portion. And is formed at the position where it slides on the
The center of the engagement pin excluding the build-up portion when the top of the build-up portion is in contact with the bent portion is the engagement portion except the build-up portion from the sliding wall surface of the entire first groove portion. Located on the intersection of the extension lines of the parallel lines separated from the radius of the coupling pin and the parallel lines separated from the radius of the engagement pin by removing the build-up portion from the sliding wall surface of the entire second groove. Thus, the distance between the center of the engagement pin and the top of the build-up portion is set,
When the disk conveyance is completed, the second rotating member drives the engagement pin with the second partial teeth meshed with the gear, so that the engagement pin slides in the first groove portion. The first rotating member is driven by the engaging pin after the top of the built-up portion passes through the bent portion while sliding on the moving wall surface. When the one rotating member is rotated by a predetermined angle, the first partial teeth are engaged with the gear, the transmission path of the driving force of the motor is switched, and the chucking operation is performed. A disk device characterized. The pair of surfaces connected to the outer peripheral surface of the engagement pin from both sides of the top portion of the build-up portion are flat surfaces, and each of these flat surfaces is an outer peripheral edge of the engagement pin. A disk device characterized by being located on a tangent line. 3. The disk device according to claim 2 , wherein an inner angle of an angle formed by the pair of surfaces coincides with an inner angle of the bent portion of the cam groove.