JPH03181055A - Disk player tray fixing mechanism - Google Patents

Abstract

PURPOSE:To surely fix and release a pair of disk trays with a simple structure by detaining lock levers in stopper members or separating lock levers from stopper members by cam grooves for lever displacement at the time of non- operation or operation of a pair of loading mechanisms. CONSTITUTION:The stopper members 37 provided in disk trays 1 and 2, a pair of lock levers 34 and 35 which are so displaced that they can be detained in and separated from stopper members 37, and cam grooves 39 for lever displacement which are provided on a control gear 12 and with which cam projections 38 of lock levers 34 and 35 are engaged are provided. The lock levers 34 and 35 are detained in the stopper members 37 by cam grooves 39 for lever displacement of the time of non-operation of a pair of loading mechanisms 3 and 4 and are separated from the stopper members 37 by these cam grooves 39 at the time of operation of loading mechanisms 3 and 4. Thus, the pair of disk trays are surely fixed and released by the simple structure where the control gear to operate the loading mechanisms or the like is shared.

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention relates to a tray fixing mechanism for a disc player.
In particular, the present invention relates to a tray fixing mechanism for a disc player that includes a pair of disc trays for mounting two discs.

[Conventional technology]

A conventional disc player of this type includes a pair of loading mechanisms that cause a pair of disc trays to protrude from the player body and pull them into the loading position of the player body;
The apparatus includes a pickup moving mechanism that moves the pickup to the side of the disk on which reproduction information is recorded. Each loading mechanism and pickup moving mechanism are independently operated by respective drive motors. [Problems to be Solved by the Invention] However, when three drive motors are used to operate each loading mechanism and pickup moving mechanism independently, the disc player becomes expensive and expensive. Since it is necessary to secure an installation space, the disc player becomes larger accordingly. Furthermore, since it is necessary to provide separate gear mechanisms between these mechanisms and each drive motor to transmit the driving force of the drive motors, the number of parts becomes extremely large and the overall structure of the disc player becomes difficult. It becomes complicated and takes a lot of time and effort to assemble. Therefore, the present applicant has proposed a disc player that uses a single drive motor and has a simple structure that operates a pair of disc trays and a pickup independently (see patent application (1) filed on the same day). ). That is, this disc player includes a control gear rotationally driven by a drive motor, and a tray gear section that operates one loading mechanism in a first rotation mode and operates the other loading mechanism in a second rotation mode. , and a pickup gear section that operates a moving mechanism to move the pickup toward the disk to be reproduced in the third rotation mode. By the way, in a disc player, when the loading mechanism is not in operation, the disc tray is held in a fixed state at a loading position so that the disc can be played, and when it is in operation, the disc tray is protruded and retracted for replacing and mounting discs, etc. It is necessary to release the fixed state as soon as possible. The present invention has been made to solve these problems, and has a simple structure that shares the above-mentioned control gear for operating the loading mechanism, etc., and is capable of reliably fixing a pair of disk trays. An object of the present invention is to provide a disc player tray fixing mechanism that can be released. [Means for Solving the Problems] The present invention includes a pair of disc trays on which discs on which playback information is recorded are respectively placed, and a pair of loading trays that protrude from the player body such as each disc tray and are pulled into a loading position. a mechanism, a control gear rotatably driven by a drive motor, and the control gear is provided to operate one loading mechanism in a first rotation mode and operate the other loading mechanism in a second rotation mode. In a disc player equipped with a tray gear section, a stopper member provided on each disc tray, a pair of lock levers that are displaceable so as to be able to engage with and separate from each stopper member, and each lock lever provided on a control gear. and a lever displacement cam groove into which the cam protrusion is engaged, and this lever displacement cam groove locks each lock lever to the stopper member when the pair of loading mechanisms is not activated, and locks each lock lever to the stopper member when the pair of loading mechanisms is activated. This tray fixing mechanism is characterized by being spaced apart from the members. [Function] When the pair of loading mechanisms are not in operation, the lever displacement cam grooves displace each lock lever to lock it in its respective stopper member. Therefore, the disc tray can be held fixed at the loading position. When any one of the loading mechanisms is operated, the lever displacement cam groove displaces the corresponding lock lever in the opposite direction and separates it from the stopper member, thereby releasing the fixation of the disk tray. Therefore, the disc tray can be extended and retracted to the loading position. Therefore, a pair of disk trays can be fixed and fixed with a simple structure consisting of a cam groove for lever displacement provided on a control gear, a pair of lock levers having cam projections, and a stopper member provided on a pair of disk trays. Can be canceled. [Example] Hereinafter, an example of the present invention will be described in detail with reference to the drawings. FIG. 1 is a plan view of a disc player including a tray fixing mechanism according to the present invention, and FIG. 2 is a partially cutaway plan view of the disc player. In these figures, 1 and 2 are disk trays. These disc trays 1 and 2 are arranged in parallel at the same height on the main body of the apparatus, and playback holes la and 2a are provided in the center for placing discs (not shown). The outer end side of each disk tray 1.2 has extension parts IA and 2A.
are each formed integrally. These disc trays 1 and 2 are projected from the player body in the X direction by a loading mechanism disposed below, and are also drawn in in the X2 direction to a loading position. That is, in FIG. 10, disk trays 1 and 2 are operated respectively. A pair of loading mechanisms 3 and 4 are shown for loading. These loading mechanisms 3.4 have moving bodies 5 with a U-shaped cross section arranged below the disc trays 1 and 2, and these moving bodies 5 are connected to guide rails 6 of the chassis that constitute the player body. It is movably attached to the A movable rack gear 7 is disposed inside each movable body 5, and each movable rack gear 7 has an idle gear (with a structure in which some teeth are missing).
Gears with missing teeth) 8 are engaged. Further, a pinion gear 9 is attached to the top surface of the tip of each moving body 5. These pinion gears 9 include a fixed rack gear 10 fixed above the guide rail 6;
Other movable rack gears 11 facing in parallel with each other are in mesh with each other. Other moving rack gears 11.11 are fixed to the lower surfaces of disk trays 1 and 2, respectively. Incidentally, the disk trays 1 and 2 are attached to other guide rails (not shown) of the chassis so as to be able to protrude and retreat. As shown in FIGS. 1 and 2, a control gear 12 is disposed at the center below the disk trays 1 and 2. As shown in FIGS. A gear portion 12a is provided on the lower surface of the outer peripheral side of the control gear 12, and a small diameter gear 13 meshes with this gear portion 12a. Another small diameter gear 14A meshes with this small diameter gear 13, and a large diameter gear 14B is coaxially attached to the shaft to which the small diameter gear 14A is attached. This large diameter gear 14B further meshes with a small diameter gear 15A, and this gear 1
Another large diameter gear 15B is coaxially attached to the shaft to which gear 5A is attached. This large diameter gear 15B meshes with a small diameter gear 16a attached to the shaft of the drive motor 16. Therefore, when the drive motor 16 is driven, the control gear 12 is rotationally driven through these gear trains. A tray gear portion 17 is provided on the upper surface of the outer peripheral side of the control gear 12 . This tray gear portion 17 is formed in an arcuate shape, and engages with the above-mentioned idle gear 8.8 to operate the loading mechanisms 3, 4, as will be described later. A pickup 18 for reproducing signals is arranged between the disk trays 1 and 2 and the control gear 12. As shown in FIG. 6, this pickup 18 is placed on an elevator base 20 as a rotating body that constitutes a pickup moving mechanism 19. elevator base 20
One end is rotatably attached to the rotation center shaft 21 together with the pickup 18 . Further, as shown in FIG. 6, an engaging protrusion 2 protruding from the upper surface of the elevator base 20
0a passes upward through the L-shaped hole 18a of the pickup 18 and is locked to the edge thereof. elevator base 20
A sector gear portion 22 for rotating the elevator base 20 is provided on the lower surface near the engaging protrusion 20a. This sector gear portion 22 is provided at a position where it meshes with the pickup gear portion 23 of the control gear 12 described above. The pickup gear portion 23 is similarly formed in a sector shape and is provided on the upper surface of the control gear 12 on the inner diameter side. Further, a cam projection 26 projecting downward is provided on the lower surface of the substantially central shaft of the elevator base 20.
6 is engaged in a base holding cam groove 27 provided on the upper surface of the control gear 12. The base holding cam groove 27 includes an arc-shaped base holding cam groove 27a, a base rotation cam groove 27b continuously formed inward at both ends of the cam groove 27a, and these cam grooves 27.
A large base passing cam groove 27c is formed continuously from the base passing cam groove 27c. The base rotation cam groove 27b constitutes a part of a pickup positioning mechanism to be described later, and is used as a rotation means for positioning the electric bake base 20. Furthermore, as shown in FIGS. 1 and 6, the pickup moving mechanism 19 is provided with a fan-shaped guide plate 24 spanning the disk tray 1.2. This information board 2
4 has an arc-shaped rising wall 24a at the outer end, and a guide groove 25 is formed in the rising wall 24a along the circumferential direction, as shown in FIG. On the other hand, a guide protrusion 18t) protrudes from the tip surface of the other end of the pickup 18, and this guide protrusion 18b is engaged in the guide groove 25. A pair of pickup positioning mechanisms 28 are provided at the tip of the elevator base 20 and at both ends of the guide plate 24. These pickup positioning mechanisms 28, as shown in FIGS. 9 and 10,
4a); a positioning groove 29 continuously formed upward at the end of the guide groove 25; and a coil spring 30, one end of which is attached above the end of the rising wall 24a.
The other end of the coil spring 30 is attached to a push-down member 31, and the push-down member 31 has a portion near the mounting side of the coil spring 30 that is rotatably supported below the end of the wall 24a. As shown in FIG. 1, the coil spring 30 is held substantially horizontally in a contracted state. Further, the pickup positioning mechanism 28 has a V-shaped groove 32 provided in the rising wall 20b at the tip of the elevator base 20. The guide protrusion 18b passes through this V-shaped groove 32 and engages in the guide groove 25. Now, below the elevator base 20, a tray fixing mechanism 33 according to the present invention is provided. The tray fixing mechanism 33 includes a pair of lock levers 34 and 35, as shown in FIGS. 1 and 2. These lock levers 34 and 35 are arranged in a V-shape and extend from the center of the control gear 12 to above the idle gears 8 and 8, and are controlled from one narrow end side or through the long holes 34a and 35a. gear 12
The pressing piece 36 is attached to the rotation center axis of the rotating shaft so as to be movable in the longitudinal direction, and a pressing piece 36 is attached to the tip of the other end. These pressing pieces 36 are pressed against a stopper member 37 fixed to the lower surface of the disc tray 1.2, thereby fixing the disc tray 1.2. Lock lever 34
, 35 are formed with notches 34b, 35b, and the rotation center shafts of the idle gears 8, 8 are located in these notches 34b, 35b in a non-contact manner. Therefore, the rotation of the idle gears 8, 8 can be prevented from being obstructed by the lock levers 34, 35, and the lock levers 34, 35 themselves can be prevented from rotating. A recess 34c is provided on one side of the distal end of the lock levers 34, 35. 35c, and rotation preventing protrusions 8a protruding from the upper surface of each idle gear 8 are engaged in these recesses 34c, 35c. Furthermore, cam projections 38 protrude from the lower surface of one end side of the lock levers 34 and 35, and these cam projections 38
is engaged in a special displacement cam groove 39 provided on the upper surface of the control gear 12. This lever displacement cam groove 39 is provided on the inner diameter side of the control gear 12, and is approximately 24 mm in diameter.
It consists of a fixed groove part 39a formed in a 0 degree arc shape and a small diameter arc shaped displacement groove part 39b continuously formed at both ends of this groove part 39a. This displacement groove portion 39b is located inside the tray gear portion 17, and communicates with the base passing cam groove 27c of the base holding cam groove 27, so that the cam protrusion 26 of the elevator base 20 can be moved as described later. It is also used when passing. Next, the operation of the tray fixing mechanism of the present invention will be explained together with the operation of the disc player. When a disk (not shown) is already placed on the disk tray 2 and positioned at the predetermined loading position shown in FIG. The pickup gear portion 23 and the tray gear portion 17 of the gear 12 are in the illustrated positions, and the elevator base 20 on which the pickup 18 is mounted is rotated and positioned toward the disk tray 1 side. In such a state, the drive motor 16 is driven, and the small diameter gears 16a, 15A, 14A, 13 and the large diameter gear 15
The control gear 12 is connected to the eighth
When the control gear 12 is rotated in the clockwise direction indicated by arrow A in the figure, the pickup gear portion 23 of the control gear 12 meshes with the sector gear portion 22 of the elevator base 20, so that the elevator base 20 is rotated along with the pickup 18 on the rotation center shaft 2.
1 begins to rotate counterclockwise along the guide plate 24. In this case, the guide protrusion 18b of the pickup 18 is guided along the guide groove 25. control gear 12
When the elevator base 20 rotates approximately 60 degrees, the cam protrusion 26 passes through the base passing cam groove 27c of the base holding cam groove 27, and as shown in FIG. into the displacement groove 39b. When the control gear 12 further rotates about 60 degrees and reaches the rotation position of about 120 degrees shown in FIGS.
At the same time, the elevator base 20 is guided by the guide plate 24 together with the pickup 18, rotates to its end, and stops rotating at the position shown in FIG. In other words, the pickup gear section 23 and the sector gear section 22 are disengaged. In this state, the pickup 18 is located at the disc playback position below the disc tray 2 as shown in FIG.
8c is located below a predetermined height position (the position shown in FIG. 9). Subsequently, when the control gear 12 rotates slightly in the direction of the arrow six, the cam protrusion 26 of the elevator base 20 enters the base rotating cam groove 27b from the base passing cam groove 27c, and enters the cam groove 27b. It is forcibly rotated counterclockwise. Therefore, the elevator base 20 rotates counterclockwise, but in this case, as shown in FIG. 10, the guide protrusion 18b of the pickup 18 comes into contact with the end of the guide groove 25, so the rotation is restricted. is held at the disc playback position. Therefore, only the elevator base 20 rotates thereafter. On the other hand, when only the elevator base 20 rotates in this way, as shown in FIG.
Since it is lifted by the V-shaped groove 32 of the guide groove 2
5 is forcibly moved upward in the upper guide groove 29 communicating with the upper guide groove 29. Therefore, the pickup 18 moves upward until the guide protrusion 18b abuts the upper end of the upper guide groove 29 and stops at that position, so that the optical pickup section 18c is positioned at a predetermined height. Therefore, after that, the disc on the disc tray 2 can be played back. In addition, guide protrusion 1
8b moves upward in the upper guide groove 29 while lifting the push-down member 31 against the elastic force of the coil spring 30. By the way, while the control gear 12 rotates approximately 120 degrees clockwise from the position shown in FIG.
As shown in FIGS. 1 and 2, the cam protrusion 38 engages in the fixing groove 39a of the lever displacement cam groove 39. Therefore, the double-ended levers 34 and 35 are connected to the idle gear 8.
．． The pressing piece 36 is displaced toward the stopper member 37 by protruding toward the 8 side.
Since it is pressed against and locked, the pickup 18
While the disc trays 1 and 2 are being rotated and positioned, the disc trays 1 and 2 are held in a fixed state. When the control gear 12 further rotates clockwise from the position shown in FIG.
As shown in FIG. 4, it enters the displacement groove 39b of the lever displacement cam groove 39, and the lock lever 34 is retreated and displaced in the longitudinal direction, that is, toward the center of the control gear 12, as shown by the arrow. Therefore, since the pressing piece 36 is separated from the stopper member 37 of the disc tray 1, the fixation of the disc tray 1 is released, and at the same time, the rotation preventing protrusion 8a of the idle gear 8 is removed from the recess 34c of the lock lever 34, so that the idle gear 8 rotations are possible. When the control gear 12 continues to rotate, as shown in FIG. 5, the tray gear portion 17 meshes with the idle gear 8 on the loading mechanism 3 side, causing the idle gear 8 to rotate counterclockwise. When the idle gear 8 rotates, the loading mechanism 3 starts operating, and the movable body 5 moves together with the movable rack gear 7 in the direction shown by the arrow. When the movable body 5 moves, the pinion gear 9 rotates clockwise since it is meshed with the fixed rack gear 10. Therefore, the movable rack gear 11 meshing with the pinion gear 9 moves, so that the disc tray 1 protrudes from the chassis, that is, from the player body in the direction of the arrow. In this case, the pinion gear 9, movable rack gear 7.11, and fixed rack gear 10 are set at a predetermined ratio of the number of teeth, so for example,
The disk tray 1 protrudes by twice the amount of movement of the moving body 5. The control qa gear 12 is moved approximately 1 clockwise from the position shown in FIG.
When the tray gear part 17 and the idle gear 8 are rotated by 20 degrees, the engagement between the tray gear part 17 and the idle gear 8 is completed, and at this point, the driving of the drive motor 16 is stopped. Therefore, since the disc tray l is held in a state that protrudes from the player body by a predetermined amount,
It becomes possible to place other discs on this disc tray 1. After placing the disk, when a close button (not shown) on the operating section is pressed, the drive motor 16 is driven in the opposite direction and the control gear 12 is rotated counterclockwise. And control gear 1
2 has been rotated approximately 120 degrees to the original position shown in FIG. 2, the drive motor 16 is stopped. Therefore, since the idle gear 8 is rotated in the opposite direction in the tray gear section 17, the loading mechanism 3 operates in the opposite direction to that described above, and the disc tray 1 is drawn into the loading position shown in FIG. On the other hand, when the disc tray 1 is pulled in, the cam protrusion 38 enters the fixing groove 39a from the displacement groove 39b, so that the lock lever 34 protrudes and returns to its original position. Therefore, the pressing piece 36 is brought into contact with and locked by the stopper member 37, and the rotation prevention protrusion 8a is engaged with the recess 34c. Therefore, the disc tray 1 is fixed at the loading position, and the rotation of the idle gear 8 is prevented. By the way, the control gear 12 rotates approximately 120 degrees clockwise from the position shown in FIG. 2, causing the disc tray 1 to protrude, and then the control gear 12 rotates approximately 120 degrees counterclockwise, as shown in FIG. While the disc tray returns to the loading position and the disc tray is pulled into the loading position, the cam protrusion 26 engages with the base holding cam groove 27a of the base holding cam groove 27, and the cam protrusion 26 engages with the base holding cam groove 27a at the fixed position shown in FIG. Fixed. Therefore, since the elevator base 20 is fixedly held at the position shown in FIG.
8 is positioned as it is at a predetermined height position shown in FIG. Therefore, even when the disc tray 1 is in operation, the disc on the disc tray 2 side can be played. Furthermore, when the disc tray 1 is extended and retracted, the cam protrusion 38 of the other lock lever 35 is only engaged with the fixing groove 39a of the lever displacement cam groove 39, so that the other pressing piece 36 is pushed against the disc tray 1. It is locked to a stopper member 37 on the side. Therefore, the disc tray 2 and loading mechanism 4 are held fixed. On the other hand, when the control gear 12 is rotated approximately 120 degrees counterclockwise from the position shown in FIG.
(see FIG. 8), the pickup 18 rotates toward the disk tray l side together with the pickup 18 (see FIG. 8), and similarly the pickup 18
The other end is positioned at a predetermined height position by the pickup positioning mechanism 28 of the present invention. And in this case,
The pickup 18 is mounted on the guide protrusion 18 on the disc tray 2 side.
b was positioned at a predetermined height with the push-down member 31 lifted against the elastic force of the coil spring 30,
When the elevator base 20 begins to rotate toward the disk tray 1, the guide protrusion 18b is not only moved downward within the positioning mechanism 29 by the V-shaped groove 32, but also pushed down by the elastic force of the coil spring 30. It is pushed down by member 31. Therefore, the guide protrusion 18b can be smoothly moved downward within the upper guide groove 29 and guided to the guide groove 25, so that the pickup 18 can be rotated smoothly toward the disk tray 1 side. Further, when the control gear 12 is further rotated counterclockwise by about 120 degrees, the other lock lever 35 is moved to the cam protrusion 38.
The disc tray 2 and the idle gear 8 are disengaged from each other through the displacement groove 39b of the lever displacement cam groove 39, and the loading mechanism 4 is similarly operated to cause the disc tray 2 to protrude from the player body. Then, by reversing the control gear 12 by about 120 degrees, the disc tray 2 is pulled into the loading position, and then the pressing piece 36 is moved to the stopper member 3 on the disc tray 1 side.
7, the disc tray 1 and the loading mechanism 4 can be fixed. When the loading mechanism 4 is in operation, the cam protrusion 26 of the elevator base 20 is similarly engaged with the base holding cam groove 27a and is fixed at a fixed position.
The elevator base 20 is held fixedly, and the pickup 18 is positioned at a predetermined height at a disc playback position on the disc tray l side. [Effects of the Invention] As explained above, according to the present invention, when the pair of loading mechanisms are not operating, the pair of lock levers are displaced by the lever displacement cam grooves provided in the control cam, and the pair of disk trays are moved. The lock levers are locked to the stopper member, and when the loading mechanism is operated, the pair of lock levers are displaced in opposite directions by the lever displacement cam grooves and separated from the stopper member, so that the control gear used to operate the loading mechanism, etc. It is possible to provide a tray fixing mechanism that can hold a pair of disk trays in a fixed state and release the fixation with a simple structure.

[Brief explanation of drawings]

1 and 2 are a plan view of a disc player including a tray fixing mechanism according to the present invention, and a plan view of the same tray fixing mechanism, and FIGS. 3 and 4 are diagrams showing the operation of the tray fixing mechanism according to the present invention. Fig. 5 is a plan view showing the operation of the loading mechanism in relation to the control gear;
The figure is a plan view of the pickup moving mechanism, FIG. 7 is a plan view showing the pickup fixedly positioned by the pickup positioning mechanism, and FIG. 8 is a plan view showing the initial operation of the pickup moving mechanism in relation to the control gear position. Floor plan, No. 9
1 and 10 are front views of the pickup positioning mechanism and its operation. 1.2... Disk tray, 3, 4... Loading mechanism, 8... Idle gear, 12... Control gear,
16... Drive motor, 17... Tray gear section, 1
8...Pickup, 18b-...Guiding protrusion, 19.
...Moving mechanism, 20-...Elevator base, 22...
・Sector gear part, 23... Pickup gear part, 2
5...Guide groove, 26.38...Cam protrusion, 27-.
・Base holding cam groove, 2'7b...Base rotation cam groove, 28...Pickup positioning mechanism, 32.
...V-shaped groove, 33...Tray fixing mechanism, 34.35
... Lock lever 36 ... Pressing piece, 37 ... Stopper member, 39 ... Cam groove for lever displacement. Figure 9, 18C Figure 10, 18c

Claims (1)

[Claims] A pair of disc trays on which discs on which playback information is recorded are placed, a pair of loading mechanisms for protruding each of the disc trays from the player body and retracting them to a loading position, and a control rotationally driven by a drive motor. a gear and a control gear for operating one loading mechanism in its first rotational mode;
In a disc player comprising a tray gear unit that operates the other loading mechanism in a second rotation mode, a stopper member provided on each of the disc trays, and a pair of stopper members that are displaceable so as to be able to be engaged with and separated from each stopper member. a lock lever, and a lever displacement cam groove provided on the control gear and into which a cam protrusion of each lock lever is engaged, and the lever displacement cam groove is used when the pair of loading mechanisms are inactive and when the pair of loading mechanisms is activated. A tray fixing mechanism for a disc player, wherein the lock levers are respectively engaged with and separated from the stopper members at different times.