JP3739593B2 - Disk attachment / detachment mechanism - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a disk inspection apparatus that performs front and back inspection of a disk-shaped recording medium, and more particularly to a disk attachment / detachment mechanism that can efficiently attach / detach a disk to / from a spindle.
[0002]
[Prior art]
A disk used for information recording such as a magnetic disk or an optical disk or a substrate disk thereof (hereinafter simply referred to as a disk) is inspected by a disk inspection device for surface defects and quality of electrical performance as a recording medium. In this inspection, a plurality of pre-inspection disks are stored in each storage shelf of a disk cassette (hereinafter simply referred to as a cassette), and the disks are sequentially taken out one by one from the opening of the cassette. Mounted on the spindle. Then, the disk is inspected by rotationally driving the disk mounted on the spindle. The inspected disc that has been inspected is stored in each cassette or a specific position of the cassette (for example, a storage shelf in a predetermined range) according to the inspection result. As described above, in the disk inspection apparatus, the disk is inspected by mounting the disk on the spindle.
[0003]
[Problems to be solved by the invention]
By the way, in a conventionally known disk inspection apparatus, a mechanism for attaching / detaching a disk to / from a spindle (hereinafter simply referred to as a disk attaching / detaching mechanism) is driven and controlled by an air cylinder or the like. Since the drive control of the air cylinder or the like is very difficult to perform, the disk is not always smoothly raised and lowered, and the disk may be damaged. That is, the disk is pulled up or pulled down at a predetermined speed with respect to the spindle. If this speed is very high, the disk is shocked when the disk is attached to or detached from the spindle. Become. The impact on the disk is very inconvenient for the disk inspection apparatus because it causes damage to the disk body or causes an operation defect in the disk attaching / detaching mechanism. In addition, since the spindle rotates at a high speed, harmful vibrations are generated in the disk if the disk is mounted with its position shifted with respect to the spindle. In order to avoid such adverse effects, it is necessary to slowly mount and demount the disk with respect to the spindle when mounting (or demounting) the disk, and to securely mount (or demount) the disk on the spindle. It is.
However, recently, it has been requested to shorten the inspection time of the disk in response to the increase in the production volume of the disk, so if the loading / unloading of the disk is extremely slow, the number of disk inspection processes per unit time There is a problem that the inspection efficiency of the disk deteriorates due to a decrease in the number of disks.
[0004]
SUMMARY OF THE INVENTION An object of the present invention is to provide a disk attachment / detachment mechanism capable of accurately and efficiently attaching / detaching a disk to / from a spindle with a simple configuration.
[0005]
[Means for Solving the Problems]
The disc attachment / detachment mechanism according to the present invention includes a spindle for attaching a disc, disc chuck means for fixing the disc to the spindle, disc support means for moving the disc relative to the spindle to attach / detach the disc, and the disc support means. A drive source that generates a driving force for moving the drive, and a constant speed motion of the drive output shaft of the drive source is converted into an inconstant motion, and the converted inconstant motion is transmitted to the disk support means. A motion conversion mechanism for moving the disk support means, and the motion conversion mechanism has a speed at a predetermined disk attachment / detachment position for attaching or detaching the disk to / from the spindle during the movement process of the disk support means. as relatively slower, are those that non-uniform motion characteristics is set, and the motion conversion mechanism, the rotational motion A plurality of protrusions formed eccentrically at different angles and radial distances with respect to the drive output shaft of the drive source, an eccentric plate that rotates together with the drive output shaft, and the protrusion as the eccentric plate rotates A plurality of cut patterns are formed so as to be engaged with any one of the racks, a rack that linearly moves in accordance with the rotation of the protrusions engaged with the cut patterns, and the linear stroke movement of the racks A transmission means for transmitting to the support means and moving the disk support means over a predetermined movement stroke, and the protrusion and the cut pattern involved in the engagement between the eccentric plate and the rack as the drive output shaft rotates. And the movement speed of the rack changes accordingly .
[0006]
According to the present invention, the disk is mounted and detached so that the moving speed of the disk support means becomes relatively slow at a predetermined disk attachment / detachment position for attaching or detaching the disk to / from the spindle. That is, the motion conversion mechanism, in the disk detaching position for mounting or detaching the disc, and the moving speed for the spindle of the disk support means, and in the other position you increase the moving speed than that.
[0007]
Therefore , even when the drive source is operating at a predetermined speed, only the moving speed of the disk support means when the disk is attached to and detached from the spindle can be reduced by the motion conversion mechanism . Therefore, the disk can be efficiently attached and detached with such a simple configuration.
As a preferred embodiment of the present invention, an interlocking mechanism in which the disk chucking / unchucking is performed by the disk chucking means in conjunction with the movement of the disk support means by the disk support means via the motion conversion mechanism. It is good to have more . In this way, it becomes possible to remove and insert the disk more efficiently. Further, if the drive source for operating the disk support means can also be used as a drive source for the disk chuck operation, there is no need for a separate drive source such as an air cylinder for the disk chuck operation. There is an advantage that can be configured compactly.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
[0009]
FIG. 1 is a partial cross-sectional side view showing an overall schematic configuration of a disk attaching / detaching mechanism according to an embodiment of the present invention. However, in FIG. 1, the state where the disk D is mounted on the spindle S is indicated by a solid line, and the state where the disk D is detached from the spindle S is indicated by a dotted line. The disk attaching / detaching mechanism is roughly composed of a disk receiver 1, an operating arm 2, and a driving means 3.
The disk receiver 1 is configured such that a disk D taken out from a cassette (not shown) and transported can be mounted on a disk mounting surface having the disk D, and an opening having a size that allows the spindle shaft SJ to pass through the center. 1a is formed. Since the opening is also formed at the center of the disk D, the disk D is mounted on the disk receiver 1 so that the center (that is, the opening) of each other substantially coincides.
The operating arm 2 is formed in a plate shape or a rod shape such as a rectangular parallelepiped or a cylindrical body, and is disposed on the side surface of the spindle S. The upper end portion of the operating arm 2 is coupled to the disk receiver 1 (that is, the operating arm 2 and the disk receiver 1 are configured integrally). Further, the lower end portion of the operating arm 2 is supported by a rack 6 described later. When the rack 6 moves up and down, the operating arm 2 moves up and down (in the direction of the arrow X) in accordance with the up and down movement of the rack 6, so that the disk receiver 1 is moved up and down with respect to the spindle S according to the up and down movement. The disk receiver 1 and the spindle S are arranged so that the spindle shaft SJ including the spindle adapter SA enters the opening 1a of the disk receiver 1 when the disk receiver 1 moves up and down. In other words, in order to securely mount the disk D to the spindle adapter SA (or to remove the disk D from the spindle adapter SA), the plane of the disk D is always set with respect to the axis of the spindle axis SJ (or spindle adapter SA). It is necessary to keep it vertical. Therefore, the disk receiver 1 (that is, the operating arm 2) and the spindle S are arranged so that the disk mounting surface of the disk receiver 1 and the spindle adapter SA are always perpendicular to each other.
[0010]
The drive means 3 is composed of an eccentric plate 4, an actuator 5 and a rack 6, and is a means for moving the operating arm 2 up and down. That is, the actuator 5 can rotate the eccentric plate 4 by its operation, and the rack 6 moves up and down in accordance with this rotation. In this embodiment, the rack 6 is formed in a plate-like rectangular body as will be described later, and when the rack 6 moves upward, the upper end 6u of the rack 6 contacts the lower end 2b of the operating arm 2, and further When the rack 6 moves upward, the entire operating arm 2 can be pushed up. That is, the rack 6 and the operating arm 2 are arranged as such.
The means for rotating the eccentric plate 4 is not limited to the actuator 5 alone. Moreover, although the example which comprised the action | operation arm 2 and the rack 6 separately was shown here, it cannot be overemphasized that these may be comprised integrally. The disk attaching / detaching mechanism may have hardware other than these, but here, a case where the minimum necessary resources are used will be described.
[0011]
Here, the operation | movement of the vertical movement of the rack 6 mentioned above using FIG.2, FIG.3 and FIG.4 is demonstrated easily. FIG. 2 is a partially enlarged view showing a part of the disk attaching / detaching mechanism according to the present invention. Specifically, FIG. 2 is an enlarged view showing the rack 6 and the eccentric plate 4 from the arrow Y direction in FIG. It is.
As shown in FIG. 2, the rack 6 is a plate-shaped rectangular parallelepiped, and a plurality of grooves are formed in a shape like comb teeth on one side surface. That is, four cuts 6A (6B to 6D) having a predetermined depth and width are formed on the side surfaces at predetermined intervals in the longitudinal direction of the rack 6. These cuts 6A (6B to 6D) are formed such that the intervals between the cuts adjacent to each other are the same. That is, the interval between the notches 6A and 6B, the interval between the notches 6B to 6C, the interval between the notches 6C to 6D, and these intervals are all formed equally. The eccentric plate 4 is provided with two convex portions 4A (4B) on the surface facing the rack 6 in a state of being separated at a predetermined interval. The interval between the first protrusion 4A and the second protrusion 4B is the same as the interval between adjacent notches in the rack 6 (for example, between 6A to 6B). The convex portion 4A and the second convex portion 4B can be fitted into different notches of the rack 6 at the same time. Furthermore, each convex part 4A (4B) is arrange | positioned so that the space | interval to the rotation center of the eccentric plate 6 may each differ. In this embodiment, the distance between the first protrusion 4A and the rotation center is longer than the distance between the second protrusion 4B and the rotation center. That is, the first convex portion 4A and the second convex portion 4B are configured in an eccentric state.
[0012]
The eccentric plate 4 starts to rotate in response to the rotation of the rotary actuator 5. The actuator 5 is fixed to the main body of the disk inspection apparatus (not shown), and at least one of the convex portions 4A (4B) on the eccentric plate 4 and the notches 6A (6B to 6D) of the rack 6 are always meshed with each other. Accordingly, the rack 6 moves up and down as the eccentric plate 4 rotates. FIG. 3 is a conceptual diagram specifically showing the change in the movement of the rack accompanying the rotation of the eccentric plate according to the rotation angle. The eccentric plate 4 starts rotating, and the movement state of the rack 6 at a predetermined rotational angle is shown in order (from the left in FIG. 3 in the case where the rotational angle is 0 degree, 90 degrees, 180 degrees, 270 degrees, 360 degrees). The moving state of the rack 6 is shown). However, in the present embodiment, when the rotation angle of the eccentric plate 4 is 0 degree, the disk D is already mounted on the spindle adapter SA, and the disk receiver 1 is waiting at a predetermined position below the disk D. (See the solid line diagram in FIG. 1). When the rotation angle of the eccentric plate 4 is 360 degrees, the disk D is mounted on the disk receiver 1, and the disk receiver 1 is waiting at a predetermined position above the spindle S (the broken line diagram of FIG. 1). Reference).
[0013]
FIG. 4 is a graph showing changes in the position of the rack shown in FIG. In FIG. 4, the horizontal axis indicates the rotation angle of the eccentric plate 4, and the vertical axis indicates the displacement from the reference position of the rack at each rotation angle. In the present embodiment, as described above, the state shown by the solid line in FIG. 1, that is, the state where the disk D is already mounted on the spindle adapter SA and the disk receiver 1 is waiting below the eccentric plate 4 is shown. And the position of the rack 6 at this time was set as a reference position.
In the following description, when the disk D is detached from the spindle adapter SA (that is, the rack 6 is moved upward), the eccentric plate 4 is mounted clockwise, and the disk D is mounted on the spindle adapter SA (that is, In the case where the rack 6 is moved downward), the eccentric plate 4 is rotated counterclockwise.
[0014]
The rack 6 is moved by sequentially engaging the projections 4A (4B) on the eccentric plate 4 and the notches 6A (6B to 6D) of the rack 6. For example, when the eccentric plate 4 starts rotating clockwise (in the direction of arrow Z) from the state where the rotation angle is 0 degree, the second convex portion 4B engaged with the eccentric plate 4 is separated from the notch 6A. On the other hand, the first convex portion 4A moves so as to be more deeply engaged with the notch 6B, and the first convex portion 4A pushes up the rack 6 in accordance with the rotation operation. The rack 6 is pushed up by the first convex portion 4A when the rotation angle is between 0 degrees and 180 degrees. When the rotation angle exceeds 180 degrees, the first convex portion 4A is now separated from the notch 6B and does not mesh, and the second convex portion 4B meshes with the notch 6C instead. When the rotation angle is between 180 degrees and 360 degrees, the rack 6 is pushed up by the second convex portion 4B. As described above, the first convex portion 4A and the second convex portion 4B are configured in an eccentric state on the eccentric plate 4. Further, the depth of cut of the cut 6B is deeper than that of the other cuts 6A (6C, 6D). Therefore, the stroke amount (displacement amount) of the rack 6 according to the rotation angle is different. As can be understood from FIG. 4, the rotation angle is rapidly displaced from 0 to 180 degrees, the displacement does not change much around 180 degrees, and a large displacement occurs again from 180 to 360 degrees. . Thus, by using the rack 6 having the shape as described above, the speed of displacement of the rack 6 (that is, the amount of displacement) can be varied according to the rotation angle. As compared with the rotation angle, it can be prevented from being displaced so much.
Therefore, if the disk receiver 1 is positioned at the relative position where the disk D is about to be mounted on the spindle adapter SA when the rotation angle of the eccentric plate 4 is around 180 degrees, the disk D is removed from the disk receiver 1. When the disk adapter 1 is attached to the spindle adapter SA, that is, when it is delivered, the moving speed of the disk receiver 1 is decelerated most, so that the disk D can be slowly and surely attached to the spindle adapter SA.
[0015]
Note that the chucking / unchucking operation of the disk D may be operated in conjunction with the operation of the disk attaching / detaching mechanism described above. FIG. 5 is a vertical cross-sectional view schematically showing an embodiment of a disk chuck mechanism in which a disk chucking / uncucking operation is performed in conjunction with the disk attachment / detachment mechanism according to the present invention. However, the state where the disk is not chucked (unchucked state) is indicated by a solid line, and the state where the disk is chucked (chucked state) is indicated by a broken line.
The disc chuck mechanism holds the disc D by being chucked (fixed). In the disk chuck mechanism in this embodiment, the central shaft 7 passes through the spindle shaft SJ and the spindle motor SM, and the central shaft 7 is biased downward by a spring B having a biasing force. A pressing portion (that is, a spindle adapter SA) including a pressing head H and a chuck claw T is fixed to the upper end of the central shaft 7 (the tip portion of the spindle S). When the chuck claw T is pressed from above by the pressing head H, the disk D can be pressed from the surface to chuck the disk D. The lower end of the central shaft 7 is supported by a pressing roller R1 that is configured to be freely rotatable at the tip portion of the arm RA. The opposite end portion of the arm RA is in contact with the operating arm 2 via contact rollers R2 and R3. Further, the operating arm 2 is such that the side surface contacting the contact roller R3 is gradually inclined from a predetermined portion (that is, the thickness (or thickness) of the operating arm 2 is thicker (thicker) at the lower end portion than at the upper end portion. ) To be formed.
[0016]
Here, the unchucking operation of the disk D in the above-described configuration will be described. When the rack 6 is moved upward, the operating arm 2 is pushed upward in accordance with the operation of the rack 6. At this time, the position of the arm RA does not change in the portion where the operating arm 2 has the same thickness (see the diagram shown by the dotted line). However, when the operating arm 2 is further pushed upward and the operating arm 2 is thicker, the distal end portion (contact roller R3 side) of the arm RA moves along the side surface of the operating arm 2. Then, the arm RA rotates about the contact roller R2 as a fulcrum. That is, with the operation of the contact roller R3, the tip of the arm RA on the opposite side (on the pressing roller R1 side) moves in an arrow Q direction so as to draw an arc with the contact roller R2 as a fulcrum (see the diagram shown by the solid line). ). Since the pressing roller R1 supports the central shaft 7, the central shaft 7 is pushed upward as the pressing roller R1 rotates. As the central shaft 7 is pushed upward, the pressing head H rises against the urging force of the spring B (or coil spring). That is, the spring B is pulled and stretched. Then, the chuck claws T that have been pressed by the pressing head H to chuck the disk D are released from the disk D. That is, the chuck claw T moves away from the surface of the disk D to bring the disk D into an unchucked state (unchucked state). That is, the chuck claw T moves away from the pressed surface of the disk D and changes from the disk chucked state to the disk unchucked state.
As described above, when the center shaft 7 moves upward through the rotation of the arm RA in accordance with the vertical movement of the rack 6, the chuck pawl T moves away from the surface of the disk D, that is, the unchucking operation with respect to the disk D is performed. Done.
[0017]
Next, the chucking operation of the disk D will be described. When the rack 6 is moved downward as opposed to the unchucking operation of the disk D described above, the contact roller R3 moves along the operating arm 2, and the arm RA is opposite to the unchucking operation with the contact roller R2 as a fulcrum. Since it is rotated in the direction, the pressing roller R1 moves downward. Then, the spring B that has been stretched when the disk D is unchucked returns to the static state (that is, the state where the spring B is not stretched) due to the biasing force of the spring B. Accordingly, the spring B gradually returns to the static state before the rack 6 is operated. That is, the center shaft 7 moves downward by the biasing force of the spring B. Therefore, the pressing head H presses the chuck claw T downward, that is, the chuck claw T approaches the surface of the disk D and presses the disk D, so that the disk D changes from the unchucked state to the chucked state. Thus, the chucking operation of the disk D is performed by rotating the arm RA according to the operation of the rack 6 and pressing the chuck claw T against the disk D by the biasing force of the spring B.
[0018]
As described above, in this disk chuck mechanism, the disk 6 is unchucked by separating the chuck claw T from the surface of the disk D via the arm RA as the rack 6 moves upward, and the rack 6 is moved downward. The disc chucking operation is performed by pressing the chuck pawl T against the surface of the disc D via the roller RA as the spring contracts due to the movement.
Further, as described above, the disk receiver 1 attaches / detaches the disk D to / from the spindle 2 in accordance with the vertical movement of the rack 6. Therefore, the disk D can be attached and detached efficiently by operating the disk D attaching and detaching operation in conjunction with the chucking / unchucking operation of the disk D. That is, the operation of chucking / uncucking the disk D and the operation of transferring the disk D between the disk receiver 1 and the spindle S can be performed in parallel with good timing. Further, the mechanism for performing the operation of chucking / uncucking the disk D and the mechanism for performing the operation of transferring the disk D between the disk receiver 1 and the spindle S can be performed by one mechanism.
[0019]
In this embodiment, the disc D is chucked by lowering the central shaft 7, but this can also be chucked by raising the central shaft 7. Further, the chuck / uncuck mechanism of the disk D is not limited to the one described above.
[0020]
【The invention's effect】
According to the present invention, the disk support means can be moved while changing the moving speed at a predetermined position with respect to the spindle, and therefore, the disk can be attached to and detached from the spindle accurately and efficiently. There is an effect. Further, the disk can be attached and detached more efficiently by operating in conjunction with the chucking / uncucking operation of the disk.
Further, since the above effect can be obtained with a simple configuration, there is an effect that the disk inspection apparatus can be configured to be small.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional side view showing an embodiment of the overall configuration of a disk attaching / detaching mechanism according to the present invention.
FIG. 2 is a partially enlarged view showing a rack and an eccentric plate in the disk attaching / detaching mechanism shown in FIG.
3 is an explanatory diagram for schematically explaining operations of a rack and an eccentric plate in the disk attaching / detaching mechanism shown in FIG. 1; FIG.
4 is a graph showing the relationship between the displacement and the rotation angle during the operation of the rack and the eccentric plate shown in FIG. 3; FIG.
FIG. 5 is a conceptual diagram showing a disc chuck mechanism for chucking / uncucking a disc in conjunction with the operation of the disc attaching / detaching mechanism according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Disk receiver, 2 ... Actuating arm, 3 ... Driving means, 4 ... Eccentric plate, 4A (4B) ... Convex part, 5 ... Actuator, 6 ... Rack, 7 ... Center axis, S ... Spindle, SA ... Spindle adapter, SM ... Spindle motor, SJ ... Spindle shaft, B ... Spring (coil spring), D ... Disc, H ... Press head, RA ... Arm, R1 (R2, R3) ... Roller, T ... Chuck claw

Claims (4)

A spindle for mounting a disk;
Disk chuck means for fixing the disk to the spindle;
A disk support means for moving relative to the spindle to attach and detach the disk;
A drive source for generating a drive force for moving the disk support means;
A motion conversion mechanism for converting the constant speed motion of the drive output shaft of the drive source into an inconstant motion, transmitting the converted inconstant motion to the disk support means, and moving the disk support means;
The motion converting mechanism converts the inconstant motion so that the speed becomes relatively slow at a predetermined disk attaching / detaching position for mounting or removing the disk with respect to the spindle during the moving process of the disk support means. The characteristics are set , and
The motion conversion mechanism is
An eccentric plate that includes a plurality of protrusions formed eccentrically at different angles and radial distances with respect to the drive output shaft of the drive source that rotates, and rotates together with the drive output shaft;
A rack that is formed with a plurality of cut patterns so as to engage with any of the protrusions as the eccentric plate rotates, and a rack that linearly moves with the rotation of the protrusions engaged with the cut pattern;
Transmitting means for transmitting a linear stroke movement of the rack to the disk support means to move the disk support means over a predetermined movement stroke;
The protrusion and the cutting pattern involved in the engagement of the eccentric plate and the rack are switched with the rotation of the drive output shaft, and the moving speed of the rack is changed accordingly. mechanism.   2. The disk attachment / detachment mechanism according to claim 1, wherein the motion conversion mechanism is a motion conversion mechanism that nonlinearly converts the motion of the drive output shaft of the drive source. 3. The apparatus according to claim 1, further comprising an interlocking mechanism for performing chucking / uncucking of the disk by the disk chucking means in conjunction with movement of the disk support means for attaching and detaching the disk via the motion conversion mechanism. Disc attachment / detachment mechanism as described. It said disc chuck means, disc removal mechanism according to any one of claims 1 to 3 by the biasing force performs a disk chuck / unchuck with Spring.

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