JPH0642294B2 - Tray positioning device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a tray positioning device for positioning a tray at a carry-in position in a disc player having a tray for transporting a disc.

(B) Conventional technology Compact disc players (hereinafter C
Among the D-type players), the stationary type has a tray for carrying a disc. In such a CD player, a disc storage portion is formed in the tray, and when the loading of the tray is completed, the disc stored in the disc storage portion is positioned right above the turntable, and then the disc is lowered. As a result, it is mounted on the turntable without eccentricity. Therefore, the tray must always be positioned at an accurate position in its carry-in position, and if misalignment occurs,
The disc is eccentric with respect to the turntable, and the disc cannot be mounted properly on the turntable.

Therefore, for example, as disclosed in Japanese Utility Model Laid-Open No. 61-61659 (G11B17 / 04), the tray is provided with an engaging portion and the player side is provided with an engaging piece and a drive mechanism for driving the engaging piece. A device has been proposed in which, when the tray loading is completed, the locking piece is displaced by this drive mechanism, the locking piece is engaged with the engaging portion, and the tray is locked at the loading position.

(C) Problems to be Solved by the Invention However, according to the above device, a locking piece is provided on the player side,
Since a drive mechanism for driving the locking piece is required, there is a problem that the structure is complicated and the number of parts is increased. An object of the present invention is to solve such a problem, in which an elastic piece is arranged in a feed gear for driving a tray, and the elastic piece is brought into contact with an abutting portion on the player side at a tray carry-in position. The purpose of the present invention is to impart a bias in the tray loading direction to the feed gear by the restoring force of the elastic piece that is bent at the time of such contact.

(D) Means for Solving the Problems To achieve the above object, the present invention provides a tray (26) that horizontally moves between a pull-out position pulled out of the player and a carry-in position loaded in the player. A feed gear (63) that meshes with a rack gear (38) provided on the tray and horizontally drives the tray, and a contact portion (55) provided on a control gear (49) that meshes with the feed gear, A tongue-like elastic piece (76) formed coaxially with the feed gear (63) and having a protrusion (76a) at its tip.
The elastic piece idles when the tray (26) is moved, and is in contact with the contact portion (55) at the tray loading position.
The contact portion abuts the elastic piece (76) at the loading position of the tray (26) to bend the elastic piece, and the return force of the feed gear (63) causes the feed gear (63) to move in the tray loading direction. It is configured to be biased to.

(E) Action With the above-described configuration, the tray (26) is provided with the contact portion provided on the control gear (49) that is disposed near the feed gear (63) and meshes with the feed gear (63) at the tray loading position. (55) contacts the elastic piece (76) arranged on the feed gear (63) for driving the tray, and the return force of the elastic piece (76) bent at the time of contact causes the feed gear (63). Is biased in the tray loading direction and is positioned at the tray loading position.

(F) Example Hereinafter, an example of the present invention will be described.

I. Overall configuration (a) Pickup mechanism All mechanical parts are mounted on the chassis (100). 1 to 5, a pickup (1) for reading information is slidably supported on a chassis (100) by shafts (2) and (2) for sliding. Here, the shafts (2) and (2) are two sets of mounting portions (3) that are arranged to face each other in the opening of the chassis (100).
The respective ends are fixed to (3), (3) and (3). In addition, the support of the pickup (1) is a through hole formed in the pickup (1).
(4) It is made by penetrating the shafts (2) and (2) through (4) and (4).

Further, a pair of rack gears (5) and (6) are attached to the pickup (1) for transmitting driving force. Actually pick up
A rack gear (5) (hereinafter referred to as a first rack gear) is screwed to (1), and a rack gear (6) is attached to the first rack gear (5).
(Hereinafter referred to as the second rack gear) is slidably attached. The second rack gear (6) is attached to the first rack gear (5).
This is done by engaging the through holes (6a) (6a) formed in the second rack gear (6) with the protrusions (5a) (5a) formed on the upper surface. That is, the protrusions (5a) (5a) have locking portions (5
b) and (5b) are formed, and the locking portions (5b) and (5b) are brought into sliding contact with the upper surface of the second rack gear (6), so that the second rack gear (6) is opposed to the first rack gear (5). It is possible to slide along the through holes (6a) (6a) without falling off. A spring (7) is inserted between these two rack gears (5) and (6) to urge the second rack gear (6) to the left in FIG. 1 with respect to the first rack gear (5). Incidentally, the biasing of the gear by the spring (7) is due to the small diameter portion (60a) of the second gear (60) meshing with the rack gears (5) and (6).
It acts to remove the backlash that occurs between the
Furthermore, it also acts on the switching operation for switching the transmission of the driving force from the motor, which will be described later, between the tray loading operation and the pickup moving operation. Further, the second rack gear (6) is formed with a trigger gear (6b) at the terminal end thereof in addition to the rack gear used for moving the pickup.

(b) Disc drive mechanism A disc-shaped turntable (8) is arranged near the pickup (1). The turntable (8) is arranged by screwing the spindle motor (9) from the bottom surface of the chassis (100) to the chassis (100) and then pivotally mounting the turntable (8) on the spindle shaft of the spindle motor (9). It is done by things.

(c) The clamp mechanism (10) is a clamper, and the rotary shafts (11) and (11) are formed at one end thereof. A disc is crimped to the turntable (8) on the lower surface of the other end of the clamper, and a crimping plate (not shown) that rotates with the rotation of the turntable (8) is rotatably attached to the clamper. It is worn. Also clamper (10)
A boss (12) is formed on the lower surface of the boss from the rotational axis position, and a projection (13) is formed at the tip of the boss (12). Further, flanges (14) and (14) are formed on the sides of the clamper (10), and pins (15) and (15) project from the lower surface of the flanges (14) and (14). ing. In addition, this pin (15) (15), as described later,
When the clamper (10) is rotated, it acts so as to move up and down the disc elevating member (lifter) arranged on the disc transport tray.

The clamper (10) is rotated with respect to the chassis (100) by the rotation shafts (11) and (11) of which are supported by the bosses (16) and (16) formed on the chassis (100). Freely supported. That is, bearings (17) and (18) are formed on the upper ends of the bosses (16) and (16), and the rotary shaft (1) of the clamper (10) of the bearings (17) and (18) is formed.
After accommodating (1) and (11), the clamper (10) is attached by screwing the upper surface of the bearing (18) whose upper surface is open.

(19) is a drive lever for driving the clamper (10), and after the circular through hole (19b) is fitted into the boss (20) arranged on the chassis (100), the upper surface of the boss (20) is screwed. When stopped, it is rotatably attached to the chassis (100). An elliptical slot (21) is formed in such a drive lever (19), and a spring (23) is stretched between the end portion (19a) and the projection (22), so It is biased clockwise. Here, the protrusion (13) formed on the clamper (10) is fitted into the slot (21) of the drive lever (19). Therefore, normally, the clamper (1
0) is urged via the projection (13) from the drive lever (19) in the direction in which the crimping plate side edge approaches the turntable (8), that is, in the direction of clamping the disc. Since the drive lever (19) has its end edge (19c) in contact with the cam gear and its rotation is controlled, the drive lever (19) is restricted by this cam gear and is not rotated.

(d) Disc Conveying Mechanism The tray for conveying the disc is supported by the supporting members (24), (24), (24) and (24) formed on the chassis (100) so as to be slidable in one direction. Such a supporting member (24) includes a protrusion (24a) for horizontally controlling the tray and a hook portion for vertically controlling the tray.
(24b) and are formed respectively. Further, the two support members (24) (24) arranged on the front side are provided with ridges (25) (25) on the opposite side surfaces. Incidentally, such ridges (25) (25)
Is for restricting the lifter from being lowered by an external force when the tray is in the pull-out position.

FIG. 2 is a diagram showing the structure of the tray. The tray (26) has a circular recess (27) formed on the upper surface thereof for accommodating a disc. This recess (27) has a diameter slightly larger than the diameter of the disc. The recess (27) has an opening (2) to allow the turntable (8) and the pickup (1) to move.
8) is formed and lifters (29) (2
Through holes (30), (30), (30), and (30) are formed so that 9), (29), and (29) protrude. Thus, the disc is positioned in the recess (27) by being housed in the recess (27), and further the lifters (29) (29)
(29) When the (29) is controlled to move up and down, the recess (27) is moved up and down in a horizontal state.

Incidentally, such a tray (26) is devised so that a disc having a diameter smaller than that of an ordinary disc can be positioned and mounted. That is, an inclined groove (31) that engages with the peripheral edge of the small-diameter disc is formed in front of the recess (27), and the peripheral edge of the small-diameter disc is formed on the upper surface of two rear lifters of the four lifters. Inclined notches (32), (32) that engage with are formed. Therefore, the small-diameter disc has a slanted groove (3
1) and the recesses (27) by engaging the notches (32) (32)
It is positioned and mounted in an inclined state. The details of such a small-diameter disc positioning and conveying mechanism are disclosed in Japanese Patent Application No. 63-2371, which is a prior application.

The above-mentioned lifters (29), (29), (29) and (29) have two lifters arranged in the front-rear direction as a pair and are fixed to the rotating rods (33) and (33), respectively. The rotating rods (33), (33) are axially attached to the lower surface of the tray (26) about the rotating shafts (33a), (33a). Further, the rotary rods (33) and (33) are provided with springs (not shown) between the protrusions (34) and (34) and the lower surface of the tray (26), whereby the lifters (29) and (29). ), (29), (29) are urged so as to project upward from the through holes (30), (30), (30), (30) of the recess (27). Therefore, the lifters (29), (29), (29) and (29) have through holes (30) (3
0), (30), (30) project into the recess (27). Also, the rotating rod
Pins (35) and (35) are formed in (33) and (33), and the upper surfaces are exposed from the through holes (36) and (36) formed in the tray (26).

When the tray (26) is at the loading completion position, the through holes (36) (36) engage with the pins (15) (15) on the lower surface of the clamper (10) by the rotation of the clamper (10). Therefore, the clamper (1
When (0) rotates in the direction of the turntable (8), this through hole (3
Pins (35) (35) facing the outside from 6) (36) are clamper (10)
It is pressed by the pins (15) (15) arranged on the. At this time, the spring force that urges the clamper (10) is the one with the rotating rod (33).
Since it is larger than the spring force for urging the spring, the rotating rods (33), (33) are rotated against the spring urging in response to the rotation of the clamper (10) in the direction of the turntable (8). As a result, the lifters (29) (29) and (29) (29) are lowered. Thus, after the disc is loaded into the loading position in the player by the tray (26), it is moved up and down in the recess (27) by the rotation of the clamper (10), and the disc is moved relative to the turntable (8). Clamped or separated.

The tray (26) constructed in this manner is further provided with ridges on the lower portions of both side surfaces.
(37) and (37) are formed, and these ridges (37) and (37) are the ridges (24a) of the support members (24), (24), (24) and (24) described above, and the hook portion ( twenty four
b) ... by engaging the support members (24) (24) (24) (2
It is slidably supported in the front-back direction by 4). Further, a rack gear (38) is formed on one side surface of the tray (26), and the rack gear (38) is driven in the front-rear direction by receiving a driving force from a gear portion described later.

By the way, a small-diameter disc having a small diameter can be mounted on the tray (26) as described above, and the peripheral edge of the small-diameter disc is mounted on the tray (26) at the notch (32) (3) of the rear lifter.
Since it must be engaged with 2), it is preferable that these lifters are fixed when the small diameter disc is mounted. In this embodiment, paying attention to such a point, as described above, the protrusions (25) and (25) are formed on the front support members (24) and (24), and the tray (26) is pulled out from the player. The protrusions (25) and (25) face the rotating rods (33) and (33) with a minute gap from the withdrawal position to immediately before the loading completion position. Therefore, the lifters (29), (29), (29) and (29) are pressed to rotate the swing rods (33) and (33).
When they try to turn, these turning rods (33), (33)
It abuts (25) and (25) to regulate the rotation, and the lifter (2
9), (29), (29) and (29) are locked at the projecting position until the tray (26) is completely loaded.

(e) Disc Size Discrimination Mechanism The disc size is detected by the detection lever (39) and the switch (40). The detection lever (39) has a protrusion (41) that comes into contact with the peripheral edge of the disc and an operation unit (42) that operates the switch (40).
A through hole (43) serving as a rotation shaft, a hook portion (44) for locking one end of a spring, and a contact portion (45) for contacting a cam gear described later are formed. Such a detection lever (39) is attached to the chassis (10
The through hole (42) is inserted through the shaft (46) planted in (0), so that the shaft (46) is rotatably attached to the chassis (100).
A spring (48) is stretched between the hook portion (44) and the hook portion (47) on the chassis (100) side, so that the spring (48) is urged to rotate counterclockwise. However, since the contact portion (45) contacts the cam gear, the rotation of the detection lever (39) is restricted,
After that, the cam gear is rotated to be displaced to the disc detection position rotated in the urging direction.

In addition, the operation part (42) of the detection lever (39) is attached to the chassis (100).
A switch (40) is arranged in the vicinity, and is turned on by the operation section (42) when the detection lever (39) is displaced to the disc detection position.

The detection lever (39) is arranged such that the protrusion (41) faces the side surface of the tray (26) with a slight gap. Then, by the rotation of the cam gear after the disc clamping operation is completed, the protrusion (41) is displaced to the disc detection position by the bias of the spring (48). At this time, as shown in FIG. 6, if the clamped disc is of a normal size, the protrusion (41) of the detection lever (39) is rotated around the periphery of the disc (D ₁ ). The rotation of the switch (4
0) is not turned on. On the other hand, if the clamped disc is a small-diameter disc (D ₂ ) as shown in FIG. 7, the detection lever (39)
Since the protrusion (41) does not contact the disk periphery, it is rotated to the disk detection position, and the switch (40) is rotated as described above.
Is turned on. Therefore, the size of the disk can be detected by the state of the switch at this time.

(f) Control gear mechanism The shape of the cam gear (49) is shown in FIG. FIG. 1A is an external perspective view, FIG. 1B is a top view, and FIG. 1C is a bottom view. As shown in the figure, the cam gear (49) is formed with an external gear portion (50). Such a gear portion (50) has a toothless portion (50a) formed in a predetermined region of the upper half, and also has a toothless portion (50b) in a predetermined region of the lower half.
Are formed. Further, two ridges (51) and (52) are concentrically formed on the upper surface thereof, and a cam portion (51a) of which the diameter is gradually reduced is formed on the inner first ridge (51). . Further, the second ridge (52) is formed in two steps with different outer diameters, and the lower portion (53) having a large inner and outer diameter is formed with a gear portion (53a) in a predetermined arc portion. The upper portion (54) is provided with a cam portion (54a) whose diameter is gradually reduced.
Further, on the bottom surface of the cam gear (49), a ridge (55) is formed at the circumferential position over the region where the toothless portion (50b) is formed,
Further, a protrusion (56) is formed along the radial direction. The protrusion (56) is the cam gear (49) at the tray unloading completion position.
The switch is operated at the rotation position of to indicate the completion of unloading of the tray.

Next, the configuration of the control gear mechanism will be described.

In FIGS. 3 and 4, the driving force from the motor (57) is
A pulley (58) pivotally attached to the rotation shaft of the motor (57), the first gear
It is transmitted to the cam gear (49) via the (59), the second gear (60), the third gear (61) and the fourth gear (62). That is, the pulley (58) meshes with the large diameter portion of the first gear (59), the small diameter portion of the first gear (59) meshes with the large diameter portion of the second gear (60), and this second gear
The large diameter portion of (60) meshes with the large diameter portion of the third gear (61), and the small diameter portion of the third gear (61) meshes with the upper gear (62a) of the fourth gear (62). The lower gear (62b) of the fourth gear (62) and the cam gear (4
The upper half of the gear part (50) of 9) meshes. The second gear (60)
The small diameter portion (60a) of the gear meshes with the rack gears (5) and (6) of the pickup mechanism described above, and drives the pickup (1).

Thus, the cam gear (49) is rotated by receiving the driving force from the motor (57), but the rotation of the cam gear (49) progresses and the gear portion (50)
When the toothless portion (50a) of the second gear faces the fourth gear (62), the fourth gear
The cam gear (49) is not rotated even if the motor (57) is operated after that because the (62) rotates idly. Further, the lower half (63a) of the fifth gear (63) for driving the tray meshes with the lower half of the gear part (50) of the cam gear (49), and further the upper gear (63) of the fifth gear (63).
b) meshes with the rack gear (38) of the tray (26) described above.
Therefore, the driving force of the motor (57) transmitted to the cam gear (49) by the gear group described above is transmitted to the tray (2) via the fifth gear (63).
It is transmitted to 6). However, as mentioned above, the cam gear (4
Since the toothless portion (50b) is formed in the lower half of the gear portion (50) of 9), the cam gear (49) rotates and the toothless portion (50b) is rotated.
Is opposed to the lower gear (63a) of the fifth gear (63), the driving force from the motor (57) is not transmitted to the fifth gear (63), so that the tray (26) is not driven.

Further, a trigger member (64) is rotatably supported (65) on the chassis (100), and a hook portion (66) of the trigger member (64) and a hook portion (66) of the chassis (100) are provided. It is urged to rotate counterclockwise by tensioning a spring (67) between them. The trigger member (64) is provided with a fan-shaped collar portion (68), and the flange portion (6)
A gear (69) is formed along the periphery of 8). Further, a trigger gear (70) is formed on the upper side surface of the trigger member (64). The trigger member (64) is urged by the spring (67) as described above, but the collar portion (68) has the cam gear (49).
Since it abuts on the lower portion (53) of the second ridge (52), its rotation is restricted. Further, when the cam gear (49) is at the predetermined rotation position, the gear portion (53a) of the lower portion (53) of the second protrusion (52) is connected to the collar portion (68).
When facing to, the gear (53a) and the collar (68) gear (69)
Mesh with each other, the trigger member (64) rotates in conjunction with the rotation of the cam gear (49). The trigger gear of the trigger member (64)
(70) meshes with the trigger gear (6b) arranged on the second rack gear (6) of the pickup mechanism. Then, the trigger member (64)
Is the cam gear (49) and the second rack gear of the pickup mechanism
The rotation is controlled by (6), and the cam gear (49) and the pickup (1) are controlled by this control operation.

One end of the drive lever (19) for driving the clamper (10) and the detection lever (39) for disc size discrimination is
The cam gear (49) comes into contact with the outer peripheries of the upper portions (54) of the first ridges (51) and the second ridges (52), respectively. And these are cam gears (49)
According to the rotation of the first and second ridges (51), (52)
The rotation is controlled by (51a) and (54a).

(g) Damage prevention mechanism When the motor (57) is driven, for example, if the tray is forcibly stopped while the tray is being conveyed, a load is applied between the motor (57) and the transmission gear, and the motor (57) or The transmission gear may be damaged. In this embodiment, the fourth gear (62) meshing with the gear portion (50) of the cam gear (49) is devised to prevent such damage.

FIG. 9 shows the configuration. That is, the fourth gear (62) is two independent gears (upper gear (62a) and lower gear (62b)).
After the gears are inserted into the shaft (71), the upper surface of the upper gear (62a) is pressed by the leaf spring (72) to form a damage prevention mechanism. The upper gear (62a) and the lower gear (62b) are respectively gear parts (73) (73) formed on the outer peripheral surface as shown in FIG. 10 and an engaging part (7) formed on the joint surface.
4) (74) and through holes (75) (75) formed in the central axis. Further, the engaging portion (74) has a protrusion (74a) and a recess (74
It is formed by b) and an inclined portion (74c) connecting these. Thus, as described above, the upper gear (62a) and the lower gear (62a)
When (b) is attached to the shaft (71), the protrusion (74a) and the recess (74b) of the one engaging portion (74) become the recess (74) of the other engaging portion (74).
The upper gear (62a) and the lower gear (62b) are connected by engaging with b) and the protrusion (74a).

The operation of the damage prevention mechanism will be described. For example, when the tray (26) is conveyed and the conveyance of the tray (26) is caught by the internal wiring of the player or the like, the fifth gear (6
3) and the lower gear (6) of the fourth gear (62) via the cam gear (49).
2b) is locked. When the lower gear (62b) is thus locked, it acts between the inclined portions (74c) (74c) of the engaging portions (74) (74) that connect the lower gear (62b) and the upper gear (62a). The reaction force of these gears in the rotation direction increases, so that the upper gear (62a) becomes a leaf spring.
It displaces upward along the inclined part (74c) of the lower gear (62b) against the bias of (72), and the engagement of the respective engaging parts (74) (74) is temporarily released. . Therefore, the upper gear (62a) is the lower gear (62b).
Despite being locked, it is rotated by a slight upward displacement. And then the upper gear (62
When a) rotates slightly, the upper gear (62a) and lower gear (62a)
The engaging portions (74) and (74) of b) are engaged at a position shifted by one step in the circumferential direction, and the upper gear (62a) and the lower gear (62b) are reconnected.

In this way, the upper gear (62a) repeatedly connects and disconnects with the lower gear (62b) to rotate only itself. Therefore, even if the tray is blocked from being transported as described above, the load on the motor (57) does not increase to the left, and
(57) will not burn out. In addition, the motor (57) and tray
(26) The gear interposed between the gear and (26) does not exert a particularly large drag force, so that these gears are not damaged.

At the joint between the upper gear (62a) and the lower gear (62b),
Instead of forming the engaging portions (74) and (74) as described above, for example, a member having an appropriate friction coefficient is provided, and the lower gear (62b)
The upper gear (62a) may be rotated by sliding on the joint when locked.

(h) Tray Positioning Mechanism FIG. 11 is a bottom view showing the tray positioning mechanism for positioning the tray (26) at the loading position. That is, the tray positioning mechanism includes an elastic tongue piece (76) having a protrusion (76a) at the tip formed at the bottom of the fifth gear (63) that meshes with the rack gear (38) of the tray (26), and first. The cam gear (49) is composed of the protrusion (55) formed on the lower surface.

As shown in (a) of the same figure, when loading the tray (26), the cam gear (4
Even if the fifth gear (63) rotates with the rotation of (9), the elastic tongue (7)
Since 6) does not contact the protrusion (55), it idles at the bottom of the cam gear (49). After that, when the loading of the tray (26) is completed, the elastic tongue (76) formed on the fifth gear (63) is completed.
The protrusion (76a) of the above contacts the outer surface of the protrusion (55) on the lower surface of the cam gear (49) (see (b) of the same figure). Then, when the cam gear (49) further rotates and the loading of the tray (26) is completed, the elastic tongue piece (76) is
While the protrusion (76a) at the tip bends the elastic tongue (76), the protrusion (5
5) slide on. In this way, the protrusion (76a) formed on the fifth gear (63) keeps the elastic tongue (76) bent and the cam gear (49)
The fifth gear (63) is urged in the tray loading direction by the reaction force from the elastic tongue (76) thus flexed, because the fifth gear (63) is in sliding contact with the protrusion (55) on the lower surface. Then, the tray (26) is subjected to such biasing, and at this time, the rear end portions (26a) (26a) of the tray are further provided on the bosses (16) (16) for supporting the clamper described above. (16a)
By abutting against the (16a), the tray is pressed against the ridges (16a) and (16a), and the tray is positioned at the carry-in position. At this time, since the lower gear (63a) of the fifth gear (63) faces the toothless portion (50b) of the cam gear (49), even if the cam gear (49) is rotated after that, the fifth gear (63) is not driven.

II. Operation The operation of this embodiment will be described below with reference to FIGS. 12 to 16.

(a) Tray carrying-in operation FIG. 12 is a plan view of the control mechanism section showing a state where the tray (26) is carried out of the player and the disc is attached and detached (see FIG. 5). At this time, the clamper (10) described above is a clamp lever.
(19) abuts on the first ridge (51) of the cam gear (49) and the spring (23)
Since it is in a position that resists the urging of the turntable (8), it is positioned in a non-clamping position separated from the turntable (8). Further, the contact portion (45) of the detection lever (39) is the second of the cam gear (49).
Since it is in contact with the upper portion (54) of the ridge (52), it is positioned at a position against the bias of the spring (48). Further, the pickup (1) is fixed at the innermost disc re-circumferential position closest to the turntable (8), and the first and second rack gears (5) and (6) arranged on the pickup (1) are set to the second position. The mesh with the small diameter part (60a) of the gear (60) is released. Therefore, even if the above-mentioned motor (57) is driven and the second gear (60) is driven,
The driving force from the motor (57) is not transmitted to the pickup (1), so that the pickup (1) is fixed to the inner circumferential position of the disc.

The pick-up (1) is fixed by the trigger member (64). In the above state, the second rack gear (6) is displaced rightward against the biasing force of the spring (7) with respect to the first rack gear (5), so that the first rack gear (5) moves toward the spring (7). ) Is pressed against the boss (77). Here, the second rack gear (6) is also urged to the left by the spring (7), but the trigger member (64) regulates the displacement to the left. That is, the trigger gear (70) of the trigger member (64) meshes with the trigger gear (6b) of the second rack gear (6), and is biased counterclockwise by the biasing force of the spring (7). Since the flange portion (68) of the trigger member (64) is in contact with the lower portion (53) of the second protrusion (52) of the cam gear (49), the trigger member (68)
(64) is not rotated. Therefore, the pickup (1) is fixed at the above-mentioned inner circumference position of the disc.

When the motor (57) is driven to load the tray (26) from such a state, the first, second, third and fourth gears (59), (60), (61), (62) ), The cam gear (49) is driven in the clockwise direction, and in conjunction with this, the fifth gear (63) is rotated in the counterclockwise direction to start loading the tray (26). On the other hand, when the tray (26) is loaded in this way, the clamp lever (19), the detection lever (39) and the trigger member (64).
Are in sliding contact with the first ridge (51) of the cam gear (49), the upper part (54) of the second ridge (52), and the lower part (53) of the second ridge (52). It is kept in the position described above.

In this way, when the tray (26) is carried in and the rotation of the cam gear (49) progresses to the state shown in FIG. 13, the toothless portion (50b) of the cam gear (49) becomes the fifth gear (63). Since it faces the lower gear (63a), the meshing between the fifth gear (63) and the cam gear (49) is released, and the loading of the tray (26) is completed. At this time, as described above, the protrusion (76a) arranged on the fifth gear (63) is not elastic.
While flexing (76), it is pressed against the ridge (55) on the lower surface of the cam gear (49), and the restoring force of the elastic tongue (76) biases the fifth gear (63) in the tray loading direction, The rear end (26a) is the above-mentioned ridge
Position the tray (26) at the loading position by pressing it against (16a).

(b) Disc clamp operation When the rotation of the cam gear (49) progresses further from the state shown in FIG. 13, the cam portion (51a) of the first ridge (51) eventually becomes the clamp lever (19).
To the contact position (see Fig. 14). Therefore, the clamp lever (19) is rotated counterclockwise by the further rotation of the cam gear (49), and the protrusion (13) on the lower surface of the clamper (10) is accompanied by this.
Is displaced in the direction of arrow A, and the clamper (10) is
Is displaced toward the turntable. When the clamper (10) is displaced in the turntable direction in this manner, first the pins (15) and (15) formed on the lower surface of the clamper (10) are through holes (36) and (36) formed on the upper surface of the tray (26). And press the pins (35) and (35) as described above. The pivoting rods (33) (33) are pivoted by the pressing operation of the pins (35) (35), and the lifters (29) (29), (29) (29) are lowered accordingly. Lifter (29) (2
The discs placed on 9), (29) and (29) descend and are placed on the turntable (8). Then, the upper surface of the disc placed on the turntable (8) is clamped.
A pressure plate (not shown) rotatably attached to (10) is pressed to complete the clamping of the disc to the turntable (8).

It should be noted that the clamp lever (19) when the clamp is in the completed state
The relationship between the cam gear and the cam gear (49) is as shown in FIG. 14,
At this time, the edge (19c) of the clamp lever (19) and the first protrusion (5
A gap is set between the cam portions (51a) of 1) so that the urging force of the springs (23) becomes the pressing force of the clamp. After that, even if the cam gear (49) further rotates, the diameter of the cam portion (51a) of the first protrusion (51) does not change. Therefore, the edge (19c) of the clamp lever (19) and the first protrusion (51) do not change. Article (51)
The gap of the cam portion (51a) is secured, so that the pressing force of the clamp does not change any more.

(c) Disc size discriminating operation When the cam gear (49) further rotates after the disc clamping shown in FIG. 14 is completed, the cam portion (54) of the second protrusion (52) of the cam gear (49) is rotated as shown in FIG. ) Is the contact part (4
The detection lever (39) is rotated counterclockwise by the urging force of the spring (48) relative to (5). And at this time, the turntable
Depending on the size of the disc installed in (8), switch (4
There is a difference in the state of 0). That is, as described above, if the diameter of the disk is large, the switch (40) remains OFF (see FIG. 6), and if the diameter is small, the switch (40) is ON (see FIG. 7). By the time the switch (78), which indicates the completion of disk loading described later, is operated, the switch (40)
The size of the disc is determined by whether or not it is turned on.

At this time, the switch (40) is closed even when the disc is not attached to the turntable (8) at all, but the presence or absence of such disc is detected by the beam emitted from the pickup (1). It is detected by the presence or absence of the reflected light from the disc.

(d) Pickup movement operation At approximately the same time as the disc size determination operation described above, the cam gear (4
The gear portion (53a) of the second protrusion (52) of 9) meshes with the gear portion (69) of the flange portion (68) of the trigger member (64) (see FIG. 15). Therefore, the trigger member (64), which was regulated by the second protrusion (52) of the cam gear (49) until then, is rotated counterclockwise by the engagement with the gear portion (69). When the trigger member (64) rotates in this way, the second rack gear (6) attached to the pickup (1) is displaced in the urging direction of the spring (7), whereby the second rack gear (6). And the small diameter portion (60a) of the second gear (60) mesh with each other, and the trigger gear (70) of the trigger member (64) and the trigger gear (6b) of the second rack gear (6) are disengaged (the first gear). 1
(See Figure 6). Therefore, the pickup (1) is the second rack gear.
The driving force from the motor (57) is transmitted via (6). Then, when the pickup (1) is slightly displaced in the outer peripheral direction in this way, the switch (78) is opened, and the end of loading described above is detected by the change in the state of the switch (78), and the motor (57) Is stopped.

At this time, in the cam gear (49), the toothless portion (50a) formed on the upper outer periphery of the cam gear (49) faces the lower gear (62b) of the fourth gear (62), and the fourth gear (62) and the cam gear The mesh with (49) is released, so it cannot be rotated. Further, the trigger member (64) is a spring (67).
Due to this, a counterclockwise rotation biasing force about the shaft (65) is applied, so that one end of the collar portion (68) rotates until it reaches the outer periphery of the boss (101) and stops.

The cam gear (49) is the gear part (69) of the collar part (68) of the trigger member (64).
Since the gear portion (53a) of the second ridge (52) is meshed with the gear portion (53a), the spring (67) is urged in the clockwise direction via the trigger member (64) to stop the trigger member (64). By this, the cam gear (49) is fixed in such a position.

(e) Disc playback operation After the above-mentioned disc loading operation is completed, when the player performs a disc playback operation, the pickup
(1) is activated and the disk is irradiated with a beam. Then, the presence / absence of the disc is determined by detecting the presence / absence of the reflected light by the photo sensor in the pickup (1). Here, when the absence of the disc is detected, the player is set to the stop mode. On the other hand, when the presence of the disk is detected, the spindle motor (9) for driving the turntable (8) is operated based on the above-mentioned discrimination of the size of the disk. That is, if the disk is large, the moment of inertia thereof is also large, so the gain of the control system of the spindle motor (9) is set large, and conversely, if the disk is small, the gain is set small. Then, after rotating the disc in this way, the pickup (1) is temporarily moved in the inner peripheral direction of the disc by a small amount, and the table of contents information (TOC: Table-of-Contents) recorded on the inner peripheral portion of the disc is recorded. After reading, normal playback is performed. Then, when the disc playback ends, the pickup (1) is moved to the innermost circumference,
The right end of the first rack gear (5) has a switch (7
The power supply to the motor (57) is stopped by closing 8). Then, the player enters a standby state waiting for the next operation command (see FIG. 16).

(f) Disk unloading operation Disk unloading is performed in the reverse order of the above. That is, when the motor (57) is driven in the direction opposite to that when the disk is loaded, the second rack gear (6) of the pickup (1) is displaced further to the right than in the state shown in FIG. When the second rack gear (6) is displaced, the trigger gear (6b) of the second rack gear (6) and the trigger gear (70) of the trigger member (64) mesh with each other, and the further second rack gear (6). Due to the displacement, the trigger member (64) is rotated clockwise against the bias of the spring (67). The rotation of the trigger member (64) causes the cam gear (4
9) is rotated counterclockwise, and the cam gear (49) and the fourth gear (6
The cam gear (49) is driven to rotate counterclockwise by the driving force from the motor (57).

When the cam gear (49) is thus rotated counterclockwise, the second rack gear (6) is further displaced via the trigger member (64), and eventually the collar portion (68) of the trigger member (64). The gear part (69) of the cam gear (49) and the gear part (53a) of the second protrusion (52) of the cam gear (49) are disengaged so that the collar part (68) is located below the second protrusion (52). (53)
It will be in a state of sliding contact with. Pick up almost at the same time
Since (1) moves to the innermost position, the wall (1a) on the turntable (8) side of the pickup and the wall (102) on the turntable (8) side in the opening of the chassis (100) come into contact with each other, pick up
(1) and the first rack gear (5) stop. After that, the second rack gear (6) is displaced through the trigger member (64),
The spring (7) is displaced while being compressed, and the engagement between the second rack gear (6) and the small diameter portion (60a) of the second gear (60) is released. As a result, the pickup (1) is fixed at the inner circumferential position of the disc. After that, when the cam gear (49) is further rotated by the motor (57), the clamper (10) is separated from the turntable (8) by a procedure reverse to the above, and the disc lifter ( 29) (29) (29) (29) lifted and separated from the turntable (8), and further the cam gear (49) and the fifth
The fifth gear (63) is rotated by meshing with the lower gear (63a) of the gear (63), and thus the tray (26) is moved in the carry-out direction.
And when the tray (26) reaches the specified unloading position, the cam gear
(49) The protrusion (56) on the bottom surface closes the switch (not shown),
The drive of the motor (57) is stopped, and the carry-out of the tray (26) is completed.

(G) Effect of the Invention As described above, according to the tray positioning device of the present invention, the elastic piece is arranged in the feed gear that drives the tray, and the contact portion that abuts the elastic piece is provided in the vicinity of the feed gear. It is possible to position the tray at the carry-in position only by arranging, and it is possible to significantly reduce the number of parts and to simplify the configuration.

[Brief description of drawings]

1 shows an embodiment of the present invention. FIG. 1 is an exploded perspective view, FIG. 2 is a perspective view showing a tray, FIG. 3 is a perspective view of a mechanism portion, and FIG. FIG. 5 is a plan view with the tray removed, FIG. 5 is a plan view when the tray is pulled out, and FIGS. 6 and 7 are plan views for explaining the disc size determination mechanism.
(a), (b), (c) are perspective views showing a cam gear, a plan view, a bottom view, FIG. 9 is a side view showing a damage prevention mechanism, and FIG. 10 is a fourth view.
FIG. 11 is a perspective view showing the gear, FIG. 11 is a bottom view showing the tray positioning mechanism, and FIGS. 12, 13, 14, 15, and 16 are views for explaining the operation of the control mechanism. FIG. 1A is a plan view and FIG. 1B is a side view. (26) …… tray, (55) …… projection (abutment part), (63) …… fifth gear (feed gear), (76) …… elastic tongue.

Claims (1)

[Claims] 1. A tray (26) horizontally moving between a pull-out position pulled out of the player and a carry-in position loaded in the player, and a rack gear (38) provided on the tray, which meshes with the tray (26). A contact part provided on the feed gear (63) that horizontally drives the tray and the control gear (49) that meshes with the feed gear.
(55) and the feed gear (63) are formed coaxially, and a protrusion (7
A tongue-shaped elastic piece (76) having 6a), the elastic piece idles when the tray (26) moves and abuts the abutting portion (55) at the tray loading position, At the loading position of the tray (26), the abutting portion abuts the elastic piece (76) to bend the elastic piece, and the return force thereof urges the feed gear (63) in the tray loading direction. A tray positioning device having the above structure.