JPH0686899B2 - Rotary cam device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary cam device applied to a device having a motion mechanism such as an electronic device.

2. Description of the Related Art Conventional methods of this kind, such as information storage devices such as DAT, VTR, and optical disk drives, and OA devices such as printers and copiers, which are so-called electronic devices in general, have a motion mechanism. A rotary cam device that rotates the cam shape to move the position of the cam follower and repeatedly and repeatedly moves something interlocked with the cam follower is often used. To move a plurality of cam followers with different directions and movements, provide a plurality of rotary cams connected to each other by gears or increase the outer diameter of the rotary cams. A plurality of independent cam-shaped grooves or protrusions are provided.

On the other hand, the downsizing of equipment requires downsizing and thinning of a rotary cam device, but in order to move a plurality of cam followers, a plurality of rotary cams and a rotary cam having a large outer diameter are required. It is difficult to adopt from the viewpoint of miniaturization.

With respect to this problem, an object of the present invention is to use a single rotary cam having a small outer diameter, but to drive two cam followers, and to have the same amount of radial movement of the rotary cam in each cam follower. It is to provide a rotary cam device that can be driven while being given.

On the other hand, in the rotary cam device of the present invention, by forming the cam groove over the entire circumference, the first cam portion formed on the inner peripheral side of the cam groove and the outer peripheral side are formed. A rotary cam having a second cam portion formed therein, and a first cam portion corresponding to the first cam portion and biased in an inner circumferential direction of the rotary cam.
A cam follower pin and a second cam follower pin that corresponds to the second cam portion and is biased in the outer peripheral direction of the rotary cam are provided.

With the above configuration, the two cam follower pins are urged in opposite directions in the radial direction and abut against the corresponding cam portions, so that the two cam follower pins do not interfere with each other and the radial movement position is increased. The two cam follower pins can be shared, and thereby a reliable cam drive operation can be realized while ensuring a sufficient amount of radial movement.

EXAMPLES Hereinafter, specific examples in which the present invention is applied to an optical disk drive device which is an information storage device will be described in detail as an example of a device having a motion mechanism.

FIG. 1 is an exploded perspective view showing main components constituting the inside of the apparatus 1, and FIGS. 2 and 3 explain the operation of mounting the cartridge 3 at a predetermined position of the apparatus 1 by describing only the main part. 4 is a schematic side view, and FIG. 4 is a slide cam 17 and a drive lever that engage with the rotary cam 19.
FIG. 23 is a plan view for explaining the operation of 43. Further, FIG. 5 is a schematic side view showing a relative positional relationship between the cartridge 3 mounted on the apparatus 1 and the electromagnet 51.

In FIG. 1, the device 1 is covered by a front panel 5 mounted on the front surface and an outer case 7, and the front panel 5 has an opening 5A into which a cartridge 3 containing an optical disc 2 as an information recording medium is inserted, and its opening 5A. The opening 5A is normally covered by rotation and is rotated by inserting the cartridge 3, and an electric switch (not shown) for giving the device a command to take out the cartridge 3 mounted in the device. ) Has an eject button 5B on the back. The cartridge 3 is the device 1
A window 3D provided on the lower surface so that the optical disk 2 directly faces the objective lens 10 on the lower surface when mounted inside, and on the upper surface at a position facing the electromagnet 51 which is a means for facing an information recording medium described later, The cartridge 3 has a slide shutter 4 for covering and protecting the cartridge 3 when not in use, and is provided corresponding to a cut-and-raised portion 20D having an inclined surface provided in a cartridge holder 20 for housing and holding the cartridge 3.
An inclined portion 3A that prevents the insertion to a mountable insertion depth when the insertion direction of the device 1 is not a proper direction,
A cartridge contact portion 3C that contacts the contact portion 30A of the holder lock 30 described later when the cartridge contact portion 3C is inserted in the proper insertion direction.
have. A recess 3B into which an opener pin 27 of the slide shutter 4 described later is inserted is provided between the cartridge contact portion C and the slide shutter 4.
The optical disk 2 is mounted on the chassis 8 which is built in the apparatus 1 and is integrated with the outer case 7 directly or via a damper (not shown) for reducing vibration from the outside of the apparatus, and the disk motor (not shown) is integrally formed. A disk table 9 is provided for rotating the same as a drive source. Further, an actuator 11 of an objective lens 10 guided by a pair of guide shafts 12 and 13 so as to move in the radial direction of the disk table 9 is mounted on the chassis 8, and a semiconductor laser or a collimator is provided in a convex portion 8A of the chassis 8. Optical system parts (not shown) such as men's, focus and tracking error detectors are arranged, and the light from the optical path opening 14 is bent by a reflection mirror (not shown) in the actuator 11 and mounted from the objective lens 10. It is irradiated onto the optical disc 2. Further, on the chassis 8, a pair of positioning pins 15 and height determining pins 16 for surely engaging and mounting the optical disk 2 contained in the cartridge 3 on the disk table 9 are set up, and they are moved to the moving position and A slide cam 17 whose direction is slidably guided is provided. The slide cam 17 is provided with a pair of left and right cam portions 17A and 17B. The cartridge holder 20 has a cam part of the slide cam 17.
A pair of engaging pins 21 and 22 that engage with 17A and 17B, respectively, are set up on both side surfaces, and positioning holes 20A and 20B that engage with a pair of holder guide shafts 23 and 24 set up on the chassis 8 are provided. When the slide cam 17 moves in the direction of arrow 40 in FIG. 3, the cartridge holder 20 is restricted from moving in the direction of arrow 40, but is in the thickness direction of the cartridge 3 to be inserted. It is lowered by the cam portions 17A, 17B of the slide cam 17 provided with an inclination angle in the arrow 41 direction. Of course, when the slide cam 17 moves in the reverse direction, the cartridge holder 20 rises. An opener arm 25 is provided at the upper part of the cartridge holder 20. One of the opener pins of the above-described cartridge 3 is erected at one end of the cartridge holder 20 and is pivotally supported by a shaft 26. The opener arm 25 has one end where the cut-and-raised portion of the cartridge holder 20 is raised.
Opener spring 28, which is a tension spring locked to 20E
Locks in at the end 25A, so that the cartridge 3
Is urged to rotate in a direction that prevents the insertion of the.

The rotation position of the cartridge holder 20 is set so as to enter the recess 3B of the cartridge 3 described above.
It is regulated at one end of 20F. Also opener arm 25
Opener pin to prevent lifting while rotating
An opener guide 29 is provided on the side of 27. Further, the cartridge holder 20 is provided with an escape portion 20G for the turning approach path of the electromagnet 51 which is a means for facing the optical disc 2 which is an information recording medium described later. Further, a holder lock 30 is provided on the chassis 8 so as to be slidably guided on the chassis 8 by a holder guide shaft 23 and a shaft 31 which are set up. The holder lock 30, which is a locking member of the cartridge holder 20, is inserted into the cartridge holder 20 as shown in FIGS.
And its abutting portion 3A at the cartridge abutting portion 3C, and the abutting portion 30A located in the escape portion 20C on the cartridge holder 20,
Further, it usually has a restriction portion 30B that abuts on the bottom surface of the cartridge holder 20 and locks the height of the cartridge holder 20. A tension spring 32, which is an elastic member, is stretched between the locking end 30C of the holder lock 30 and the locking end 17C of the slide cam 17. When the pulling spring 32 comes into contact with the cartridge abutting portion 3C of the cartridge 3 inserted into the abutting portion 30A of the holder lock 30, it generates an urging force in a direction to prevent the insertion and simultaneously with respect to the slide cam 17. The urging force is applied in the direction of arrow 40 in FIG. As a result, the cartridge 3 inserted into the cartridge holder 20 assembled to the slide cam 17 through the opening 5A is urged so as to descend in the thickness direction thereof, and its descending movement position is the holder lock 30. It is regulated by the regulation unit 30B, and the movement position of the slide cam is also regulated at the same time. The position of the holder lock 30 by the urging force of the tension spring 32 is restricted by the holder guide shaft 23 and the shaft 32.

Further, a rack lever 43 having a rack portion 43A is slidably provided on the chassis 8 by a guide shaft 45 set up in the chassis 8. The one end 43B is biased by a torsion coil spring 46 in the direction of arrow 43C in FIG. The rack portion 43A meshes with a pinion portion 48A of a rotating holder 48 which is pivotally supported by a shaft 47 which is erected on the convex portion 8A of the chassis 8, and the rotating holder 48 is an electromagnet which is a means for facing the optical disc 2. A magnet holder 49 that holds 51 is pivotally supported. Magnet holder 49 is a torsion coil spring
It is urged to rotate in the direction of arrow 49A by 49A, and its rotating position is regulated by the contact pin 50 erected on the bottom surface of the magnet holder 49 contacting the convex portion 8A of the chassis 8. When the pinion lever 43 moves and the magnet holder 49 rotates to a part of the convex portion 8A to move to or from the position facing the mounted optical disk 2, the magnet holder 49 rotates smoothly. A chamfered portion 8B is provided so as to do so. On the other hand, the back side of the chassis 8 has a mounting bracket
The motor 33 is mounted via the 38, the worm 34 integrated with the motor 33 meshes with the worm wheel 35 pivotally supported by the mounting bracket 38, and the pinion portion 36 integrated with the worm wheel 35 is also the mounting bracket. The rotary cam 19 is rotated by meshing with the outer circumference of the rotary cam 19 which is pivotally supported by 38. The rotary cam 19 has a cam groove 19 '.
It has a first cam portion 19A and a second cam portion 19B that form a.
Then, the first cam follower pin 18 corresponding to the first cam portion 19A is planted on the slide cam 17 in the first cam portion 19A.
Is arranged so that it can be engaged with, and at the same time, the second cam portion 19B is provided with a rack lever 43, and a second cam portion 19B corresponding to the second cam portion 19B.
The cam follower pin 44 is arranged to be engageable.

Here, the first cam follower pin 18 is biased in the inner circumferential direction of the rotary cam 19 by the tension spring 32, and
The cam follower pin 44 is biased in the outer peripheral direction of the rotary cam 19 by a torsion coil spring 46. As a result, even when the rotary cam 19 is rotated in the direction of the arrow 42 in FIG. 4, the rotary cam 19 abuts only the cam portions 19A and 19B, respectively, while sharing the moving position of the rotary cam 19 in the radial direction of the rotation, but causing interference. Without moving, the slide cam 17 and the rack lever 43 can be moved along the cam shape, respectively. The rotary cam 19 has a second
As shown in the figure, it has a rotational position detection unit 19C, and projections 19C ′ having different radii of rotation are provided there, and the projections 19C are provided.
A detection switch 37 (see FIG. 1) for detecting the rotation angle by C'is provided. When the cartridge 3 is inserted, the relative position between the first cam follower pin 18 and the cam portion 19A of the rotary cam 19 is shown by the broken line in the figure with the slide cam 17 together with the first cam follower pin 18 as shown in FIG. The positional relationship does not hinder the movement to the position shown. The second cam follower pin 44 is in contact with the cam portion 19B of the rotary cam 19 as shown in FIG. 4, whereby the electromagnet 51, which is the facing means for the optical disc 2, is attached as shown by the chain double-dashed line in the figure. The cartridge 3 is arranged at the position shown by the solid line in the drawing outside the extended space in the thickness direction (corresponding to the range 3E shown in FIG. 5).

The operation of the configuration of the above embodiment will be described below. First, as shown in FIG.
Rotating lid 6 in opening 5A provided in front panel 5 of
When you insert it into the cartridge holder while rotating,
In the process, the opener pin 27 is inserted in the recess 3B of the cartridge 3.
And the insertion operation is further advanced, the opener arm 25 is rotated, the slide shutter 4 of the cartridge 3 is slid, the window 3D of the cartridge 3 is released, and the built-in optical disk 2 is inserted into the objective lens 10. To be exposed to. As shown in FIG. 2, when the insertion of the cartridge 3 is further advanced in the direction of arrow 39, the cartridge contact portion 3C of the cartridge 3 comes into contact with the contact portion 30A of the holder lock 30, and the holder lock 30 is pulled by the spring 3.
Move against 2. In the meantime, the position of the slide cam 17 is the cartridge 3 in which the cartridge holder 30 which is biased in the direction of the arrow 39 by the tension spring 32 is inserted.
The holder lock 30 is regulated by the regulation portion 30B of the holder lock 30.

Then, when the cartridge 3 is further inserted, the height regulation of the cartridge holder 20 by the regulation portion 30B is released, and the slide cam 17 moves in the direction of arrow 40 by the urging force of the tension spring 32 as shown in FIG. At the same time, the cartridge 3 is moved together with the cartridge holder 20 in the direction of the arrow 41, and the cartridge 3 is moved to the positioning pin on the chassis 8.
It is mounted at a predetermined position on the chassis 8 by 15. At this time, the position of the holder lock 30 is determined by the side surface of the restriction portion 30B contacting the cartridge holder 20, and at the same time, the contact portion 30A is disconnected from the cartridge contact portion 3C of the cartridge 3 and the cartridge 3 is removed. The position of is determined by the positioning pin 15. This is because the cartridge 3 has the cartridge holder 2 by the regulating portion 30B.
This is obtained by setting the position where the regulation to 0 ends slightly to a position that is slightly overshooting in the insertion direction of the cartridge 3.

Further, when the insertion is too deep, the insertion position is regulated by one of which is the escape portion 20C and the holder lock 30 of the cartridge holder 20 whose movement direction is regulated by the pair of holder guide shafts 23 and 24 which are erected on the chassis 8. Of the cartridge holder 20 and the inclined portion 3A of the cartridge 3 by contacting the contacting portion 30A of the cartridge holder 20 and the other contacting portion 30A of the cartridge holder 20 shown in FIG.
And are brought into contact with each other. As shown in FIG. 4, the relative position between the rotary cam 19 and the first cam follower pin 18 erected on the slide cam 17 at the completion of the above mounting operation is such that the first cam follower pin 18 is the first cam of the rotary cam 19. It has moved to the position shown by the broken line in the figure without being blocked by the part 19A, and the rack lever 43
The second follower pin 44, which is set up in the vertical direction, is biased by the torsion coil spring 46 to the second cam portion 19B of the rotary cam 19.

During this mounting operation, the electromagnet 51, which is the facing means for the optical disc 2 which is the information recording medium in FIG. 5, has an extension space in the thickness direction of the cartridge 3 to be mounted (shown schematically in the drawing as indicated by the broken line in the drawing). It is located outside the range 3E). After this mounting operation, the second cam follower pin 4 which is in contact with the cam portion 19B by rotating the motor 33 and rotating the rotary cam 19 by 90 degrees in the direction of arrow 42 in FIG.
4 is moved in the inner circumferential direction of the rotary cam 19 against the torsion coil spring, and the movement of the rack lever 43 thereby causes the rotation holder 48 that meshes with the rack portion 43A and the pinion portion 48A to be rotated in the arrow 52 direction, The height of the magnet holder 49 axially supported by the electromagnet 51 is regulated by the abutment pin 50 abutting the convex portion 8A of the chassis 8 and enters the extension space of the cartridge 3 in the thickness direction. Then, as shown in FIG. 5, the contact pin 50 is chamfered.
The contact with the convex portion 8A is cut through 8B, the magnet holder 49 rotates in the direction of arrow 52A, and the electromagnet 51 completes facing the optical disc 2 contained in the cartridge 3 shown by the broken line at a predetermined distance. To do. After the mounting operation is completed, the optical disk 2 is irradiated with laser light through the objective lens 10 to perform the information recording / reproducing operation.

Next, regarding the operation of taking out the cartridge 3, first, by pressing the eject button 5B provided on the front panel 5 shown in FIG. After confirming that the rotation of the optical disk 2 is stopped by a system controller (not shown) using a microcomputer or the like, the motor 33 is rotated, and thereby the rotary cam 19 is rotated in the direction of arrow 42 in FIG. Then the first 90 degree rotation (18
At a rotation angle of 0 degree), the first cam portion 18A does not substantially move the first cam follower pin 18, and the second cam follower pin 44 moves along the second cam portion 19B.
9 towards the outer circumference, thereby the rack lever 43
The movement of the electromagnet 51 performs the reverse movement operation described above. When the movement of the electromagnet 51 is completed and the rotary cam 19 is further rotated, the second cam follower pin 44 does not change its position, but the second cam follower pin 44 is set on the slide cam 17 at the position corresponding to the broken line in FIG. The first cam follower pin 18 is moved in the outer peripheral direction of the rotary cam 19 by the first cam portion 19A, and moves in the direction opposite to the arrow 40 shown in FIG. 3 against the tension spring 32, whereby the cartridge holder.
20 also rises in the thickness direction with the cartridge 3.
Then, when the raised position of the cartridge holder 20 eventually exceeds the height of the restricting portion 30B of the holder lock 30, the holder lock 30 is pulled by the urging force of the tension spring 32, and the arrow 40
And the cartridge 3 is abutted at the same time.
At 30A, it pushes out in the discharge direction. After the completion of the discharging operation of the cartridge 3, the rotary cam 19 is further rotated to stop at the rotation position shown in FIG. 4, and after the cartridge is mounted at the predetermined position, the rotary cam is rotated by 90 degrees to cause the electromagnet 51. To complete the movement to a predetermined position is detected by hitting the detection switch 37 by the plurality of protrusions 19C ′ of the rotation detection unit 19C of the rotary cam 19 and stopping the rotation of the motor 33. is there. In the present embodiment, a single rotary cam according to the present invention is used. However, for example, a plurality of rotary cams are connected to each other by gears or the like and applied to the apparatus to perform more complicated operations. It is self-evident that it can be given to the cam followers.

As described above, according to the present invention, in order to move a plurality of cam follower pins, a plurality of rotary cams connected to each other by a gear or the like and a large outer diameter having a plurality of independent cam grooves or protrusions are provided. Without the need for a rotary cam
While using a single small outer diameter rotary cam,
It is possible to provide a rotary cam device that can drive two cam follower pins, and can drive each cam follower pin while giving the same amount of radial movement of the rotary cam to each cam follower pin. It is possible.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing main components constituting the inside of the apparatus, and FIGS. 2 and 3 are schematic side views for explaining the operation of mounting a cartridge at a predetermined position of the apparatus by describing only the main part. FIG. 4 is a plan view for explaining the operation of a slide cam and a drive lever that engage with a rotary cam, and FIG. 5 is a schematic side view showing the relative positional relationship between a cartridge mounted on the apparatus and an electromagnet. . 1 ... Device, 2 ... Optical disc, 3 ... Cartridge,
8 …… Chassis, 17 …… Slide cam, 18 …… First cam follower pin, 19 …… Rotary cam, 19A …… First
Cam part, 19B …… Second cam part, 20 …… Cartridge holder, 30 …… Holder lock, 32 …… Tension spring, 33 …… Motor, 43 …… Rack lever, 44 …… Second cam follower pin, 48 …… Rotation holder, 51 …… Electromagnet.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Bibliography Sho 58-179530 (JP, U) Japanese Patent Sho 54-14701 (JP, B2) Japanese Patent Sho 49-37466 (JP, B2)

Claims (1)

[Claims] 1. A rotary cam having a first cam portion formed on the inner peripheral side of the cam groove and a second cam portion formed on the outer peripheral side by forming a cam groove over the entire circumference, A first cam follower pin corresponding to the first cam portion and biased in the inner circumferential direction of the rotary cam; and a second cam follower pin corresponding to the second cam portion and biased in the outer circumferential direction of the rotary cam. A rotary cam device characterized by being provided.