JPS61273770A - Disk device - Google Patents

Abstract

PURPOSE:To obtain a disk device which presses a disk against a spindle base with a proper downward energizing force by providing a spring wall or spring member which energizes a disk presser downward and a forward/backward rotation switch which is turned on and off by projections of a cam gear. CONSTITUTION:The pin 3a of the disk presser 3 is fitted in the peripheral groove 2a of the cam gear 2 and when the pin 3a is at the position of the cam wall 2c, the other side of the disk presser 3 is an elevation state, the forward/backward rotation switch 5 has backward rotation contacts 5a and 5b made by a projection 2f, and a loading case 6 is projected to right. When a start switch is closed in this state, the cam gear 2 rotates counterclockwise, the pin 3a abuts on an external cam wall 2a in the peripheral groove 2a and moves out to left to lower the disk brace 4 of the disk presser 3, and the cam gear 2 rotates, so that the pin 3a is pressed by the spring wall 12a of an internal leaf spring 12 from the external cam wall 2e. Consequently, the disk 13 is pressed against the spindle base 14 by the disk brace 4 of the disk presser 3 with the proper downward energizing force.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a disc device that urges a digital audio disc or a video disc downward onto a spindle stand.

[Prior art]

Conventional mechanisms for urging the disk downward against the spindle stand using a disk holder include a method in which the disk holder is urged by a cylindrical rotating cam, a slide cam method, and a groove cam method, all of which use a pin fixed to the disk holder. is pushed by a rigid cam surface to apply a downward biasing force to the disc. Therefore, due to variations in the dimensional accuracy of the cam surface and the bottle or disc holder, the disc holder is pushed down strongly, causing problems with the rotation of the spindle stand, and the weak biasing force can cause problems with the rotation of the disc. Furthermore, in the cylindrical rotating cam system, since the cylindrical rotating cam is disposed outside the loading case, it protrudes to the side and has a large area, resulting in an increase in size.

[Purpose of the invention]

In view of the above drawbacks, the present invention moves the disc holder up and down using the cam wall of the cam gear, and uses a spring wall provided on a part of the cam wall or a spring member provided on the disc holder to absorb variations in the dimensional accuracy of the disc holder, etc. The object of the present invention is to propose a disk device in which the disk is pressed against the spindle stand with an appropriate downward biasing force.

[Structure of the invention]

The present invention provides a cam gear having a toothless portion rotated by a motor, a disc holder that is moved up and down by a cam wall of the cam gear, a spring wall or a spring member that biases the disc holder downward, and A forward/reverse switch is provided which is opened and closed by a protrusion of a cam gear, and the disk holder is biased downwardly against the spindle base by the spring wall or spring member.

(Example) The present invention will be described below with reference to an example shown in the drawings. To describe the disc device in terms of an audio disc biasing mechanism, as shown in Figs. Raise piece 1a.

Both ends of one side of the disk presser 3 are supported by 1b, and the disk presser 3 is rotated using the two-side support portions as fulcrums.A pin 3a is formed on one side of the disk presser 3, and the pin 3a is a straight line connecting both supporting positions. The pin 3a on the top is in the circumferential groove 2a of the cam gear 2.
It is fitted in.

A circumferential groove 2a and an L-shaped plate spring 12 are provided on the upper surface of the cam gear 2.
A groove 2b into which one end of the circumferential groove 28 is fitted is formed, and the circumferential groove 28 is a third groove.
In the figure, the radius of the outer cam J2c on the line a in the radial direction from the center is the minimum, and the radius of the outer cam wall 2d on the line a in the radial direction from the center is the largest, as shown in FIG. spring 12
The pin 3a, which is pushed outward by the cam wall 2d, is formed in a radius such that it is not pushed by the cam wall 2d.

When the cam wall 2C of the cam gear 2 is at the pin 3a position, the other side of the disc holder 3 is lifted upward to the maximum, and as the cam gear 2 is rotated counterclockwise, the radius of the circumferential groove 2a gradually increases and the disc The other side of the presser foot 3 is lowered by its own weight, and the pin 3a is brought into contact with the inner leaf spring 12 from the position of the cam wall 2e, and when the cam gear 2 is further rotated, the pin 3 is pushed by the leaf spring 12.
A is pushed outward, and a disk spindle 4 provided at the center on the other side of the disk holder 3 presses the disk 13 against a spindle stand 14 having a disk receiver. A protrusion 2'' is provided on the upper surface of the cam gear 2, and the center contact piece 5a of the forward/reverse switch 5 fixed to the chassis 1 is exposed so as to be pressed by both ends of the protrusion 2f. A toothless portion 2g in which half of the thickness is cut out is formed in the tooth portion.

As shown in FIGS. 1 and 2, a through hole 3b is bored in the center of the other side of the disc holder 3, and a disc spool 4 is inserted from the bottom to the top, and is attached with a plurality of inner parts 4a. A ball 15 provided at the upper center of 4 is pushed down by a leaf spring 16. A spindle stand 14 having the disk holder is arranged below the disk rotation 4 so as to be rotated by a spindle motor 17. Leaf spring 16
A long hole is drilled in the middle, and the inverted-shaped spring hook part 3C of the disc presser 3 is inserted, and the rear leaf spring 16 is moved to the left side in the figure, and the notches on both sides of the leaf spring 16 are inserted into the disc retainer 3. The hook is fixed in the groove and the rib 3d. If the plate spring 16 is fixed in this manner, the plate spring can be fixed without using screws or the like, reducing the number of parts and improving work efficiency.

Between the disc holder 3 and the chassis 1, there is an O-ding case 6 with four rollers 18 that can slide left and right as shown in Figure 2.
The loading case 6 is held by the FA vehicle 19.20 arranged as shown in FIGS. 2 and 4 between the rack 6a formed inside one side of the loading case 6 and the cam gear 2.
is slid.

As shown in FIG. 2, the O-ding case 6 has upper and lower horizontal rectangular case parts 6b and 6c, a deck part 6d connecting the case parts, a recessed part 6e larger than the outer diameter of the disc 13, a long hole 6f at the center of the recessed part, and a third part. Inverted trapezoidal recesses 6g on both sides in FIGS. 1, 5, and 6, elongated holes 6h on both sides, and recesses provided to pass from the front wall 61 to the recesses 6e as shown in FIGS. 2 and 7. 6
j, 6, and a case portion 6b.

Inside 6C, there is a perpendicular wall 6n+ as shown in Fig. 2 and Fig. 8.
.

6m is provided, and when the loading case 6 comes into contact with the contact portion IC11c provided on the chassis 1 shown in FIGS. 3 and 8, the loading case 6 is prevented from protruding to the right. The cam gear 2
The toothless portion 2g corresponds to the gear 20 when the loading case 6 is in the position shown in FIG. 2 and when the loading case 6 is protruded to the maximum right side in FIG. It is configured.

The disc presser 3 and loading case 6 are shown in FIG.
In the state shown in FIG. 2, the standard It111 bin 3e protruding downward from the disc holder 3 is inserted into the through hole 6n of the loading case 6, and the inserted state is observed from the window hole 3f around the standard υ1 bin 3e. If the regulating pin 3e and the through hole 6n do not match, correct the orientation of the cut-and-raised pieces 1a and 1b to make them match. a case portion 6b of the loading case 6;
A disc lift lever 7 shown in FIG. 9 is rotatably mounted inside each of the disc lift levers 6c as shown in FIG. 8, and one side is biased upward by a leaf spring 21.

The two disc lift levers 7 are provided with two protrusions 7a, 7a on the upper surface of one linear side, respectively, on which the disc 13 is placed, and the protrusions 7a are provided with elongated holes 6h on both sides of the loading case 6, as shown in FIG. It protrudes upward from 6h. In the middle of the disc lift lever 7 is an upward-facing bin 7.
b is provided protrudingly, and the other side is formed wide and has a long hole 70.
is formed. A spring hook is a protrusion 7d on one side of the long hole 7C.
is formed, and a horizontal round shaft 70 is formed at the other end of the elongated hole 7C. Inside the horizontal rectangular case parts 6b and 6c into which the disc lift lever 7 can be removed, there are formed a downward recess 6p, an L-shaped spring part 6r, and a spring hook 6t.

When the disc lift lever 7 is installed inside the case parts 6b and 6e, the round shaft 7e is fitted into the recess 6p, and the L-shaped spring part 6r is inserted into the hole of the leaf spring 21 in the same way as the leaf spring 16. One end of the leaf spring 21 has a spring hook on the protrusion 7.
d, the leaf spring 21 is moved to the left side in Fig. 8,
A spring hook 6t is inserted into the hole at the other end of the leaf spring 21 and removed. Bin 7b of disc lift lever 7
is inserted into the hole 6S of the loading case 6, and a bottle 3g protruding downward from both sides of the disk holder 3 faces into the hole 6S so that it can be inserted, as shown in FIGS. 2 and 8. When 3 is lowered, bottle 3g and bottle 1b
is pushed down, the disc lift lever 7 is lowered against the leaf spring 21, and the disc 13 is placed on the spindle stand 14.

The chassis 1 has a long hole 1d as shown in FIGS. 1 to 3.
The pickup unit 23 is fixed to a mounting plate 8 supported by a shaft 22, and the pickup unit 23 is moved by a pickup feed motor 24 with a tooth width of 25.26 and a rack plate 9.
It is provided so that it can be slid left and right through it.

A transparent window plate may be fixed to the front recess 6j16k of the loading case 6 so that the rotating state of the disk 13 can be seen.

The gear 10 and the gear 25 may be replaced by integrally forming a pinion and a pulley, respectively, and may be configured to be rotated by the loading motor 11 and the pickup feeding motor 24 via a belt.

When the disc device is configured as described above and the pin 3a of the disc holder 3 is fitted into the circumferential groove 2a of the cam gear 2 having a toothless portion, and the pin 3a is located at the position of the cam wall 2C as in the third factor, the disc The other side of the presser foot 3 is in a raised state, and the forward/reverse rotation switch 5 has the protrusion 2f and the reverse rotation side contact pieces 5a and 5b are closed. Further, the loading case 6 is in a state of being protruded to the right side.

In this state, when a start switch (not shown) is closed, the cam gear 2 is rotated counterclockwise, and the bottle 3a is moved to the left outside by contacting the outer cam wall 2C in the circumferential groove 2a, and the disc presser 3 The disk rotation 4 side of the disk holder 3 is lowered, the cam gear 2 is rotated, and the bottle 3a is pushed from the outer cam wall 2e by the inner spring wall 12a of the leaf spring 12, resulting in the state shown in FIG. 4 to disk 1
3 is pressed against the spindle stand 14 with an appropriate downward biasing force. Before the disk spinner 4 side completes its descent, the loading case 6 is returned from the protruding state on the right side to the state shown in FIG. 2, the spindle stand 14 is rotated, and the information recorded on the disk 13 is read by the pickup unit 23. At this time, the contact pieces 5a and 5c on the forward rotation side of the forward/reverse rotation switch 5 are closed by the protrusion 2''.

Next, when the start switch is closed, the cam gear 2 is rotated clockwise to loosen the downward biasing force of the disk holder 3, and the pin 3a is pushed toward the center of the cam gear 2 in the section from the cam wall 2e to the cam J2c. Then, the other side of the disc holder 3 is raised, and then the loading case 6 is moved to the protruding state.

As mentioned above, the pin 3a is separated from the cam wall 2C of the cam gear 2 by 2.
When pushed by e and spring 1112a, the bottle is pushed only by the cam wall as in the conventional case, and due to variations in the accuracy of one method, the disc or spindle base may be forcibly pressed by the disc rotation, or the downward biasing force may be insufficient. The shortcomings of are eliminated. Furthermore, since the cam gear 2 is provided below the disc holder 3, the width does not become wide and the height can be reduced, resulting in a compact structure.

In addition, the position of the bottle 3a and the supporting position of the disc presser 3 are approximately -
Since they are arranged in a straight line, the operation of moving the disk presser 3 up and down can be performed efficiently.

FIG. 11 shows a modification in which the disc holder 3 is urged downward by a spring member 27 made of a coil spring, and the spring member 21 is stretched between the top and bottom of the disc holder 3 on the right side in the drawing and the chassis 1. When the spring portion 4427 is provided, the spring wall 12a formed by the leaf spring 12 provided on the cam gear 2 may be omitted.

〔Effect of the invention〕

Since the present invention is configured as described above, even if there are variations in the dimensional accuracy of the parts, after the bottle of the disk holder is moved up and down by the cam wall of the cam gear, the disk holder can be moved between the disk and the spindle base using the spring wall or spring member. It is possible to provide a disk device that can press with an appropriate downward biasing force that does not interfere with the rotation of the disk, and has an excellent effect.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is a cross-sectional side view of the main part of a disk device, FIG. 2 is a plan view of the disk device,
Fig. 3 is a plan view of the chassis, Fig. 4 is an exploded cross-sectional side view of the cam gear and gear train, Fig. 5 is a side view of the disk device, and Fig. 6 is 0 of the ■-■ line in Fig. 2. - A cross-sectional front view of the loading case, Figure 7 is a front view of the disk device, and Figure 8 is the front view of the disk drive.
Figure 9 is a plan view of the disc lift lever, Figure 10 is a plan view of the cam gear with the bottle pressed by the spring wall, and Figure 11 is a cross-sectional side view of the main part of the disc lift lever installed in the loading case. FIG. 7 is a plan view of a main part of a modified example in which the disk presser is urged downward by a spring member. 2...Cam gear, 2c12d...Cam wall, 2g...
・Missing tooth part, 2 "... protrusion, 3... disc holder, 3
a... Bin, 5... Forward/reverse switch, 11... Motor, 12a... Spring wall, 14... Spindle stand, 27... Spring member.

Claims (1)

[Claims] A cam gear having a toothless portion rotated by a motor, a disc holder that is moved up and down by a cam wall of the cam gear, a spring wall or a spring member that biases the disc holder downward, and a protrusion of the cam gear. A forward/reverse switch that is opened and closed by a forward/reverse switch, and wherein the spring wall or the spring member urges the disk holder downwardly toward the spindle stand.