JPS63217561A - Disk player - Google Patents

Abstract

PURPOSE:To surely mount a disk on a turntable without generating misalignment by engaging the longer-diameter part of a cam gear for drive with the toothless part of a transmission gear at a time immediately before the end of the transferring of a try to lock the transmission gear. CONSTITUTION:The cam gear 69 driving a disk tray consists of an inner gear 69a and an outer gear 69b, and a part of the outer gear 69b is made the longer- diameter part 75, also, the lower half of the transmission gear 70 is made the toothless part 76. By the rotation of a tray-transfer driving motor, the cam gear 69 rotates clockwise and a transfer gear 71 rotates also clockwise so that the tray is pulled into the shassis side. At a time immediately before the end of the transfer of the tray, the toothless part 76 of the transmission gear 70 is engaged with the longer-diameter part 75 of the cam gear 69, hence the transmission gear 70 is clocked and does not rotate any further even though the gear 69 rotates. As a result, the disk can be mounted on the turntable surely without generating the misalignment.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to a disc player that uses a cam gear to perform clamping operations and disc transport operations.

(Example) Conventional technology Conventionally, as a disk player that performs a clamping operation and a disk conveying operation using a cam gear, for example, Japanese Patent Application Laid-open No.
The technique disclosed in Publication No. 80160 (GLIB 17104) is known.

In such a disc player, the rotation of the clamper, which is biased toward the turntable, is regulated by contacting a circumferential wall having a cam portion disposed on the top surface of the cam gear. A gear portion is provided on the disk, and the tray is transported by meshing this gear portion with a rack gear disposed on the side surface of the tray for transporting the disk. Such a gear part is provided with a toothless part, and when this toothless part reaches the rack gear, conveyance of the tray is completed.
A disk supported by a tray is positioned on a turntable. Then, at this timing, the contact portion of the clamper that was in contact with the wall on the upper surface of the cam gear reaches the cam portion of this wall, and the clamper rotates in the force direction along this cam portion. As a result, the disc is pressed against the turntable by this clamper, and the mounting of the disc on the turntable is completed.

In such a disc player, the cam gear and the tray are disengaged when the tray is completely loaded, so that the tray can move freely in the horizontal direction. For this reason, a protrusion is provided on the clamper side and a groove is provided on the tray side, and these protrusions and grooves are engaged with each other by rotational displacement of the clamper, thereby regulating the movement of the tray. However, since the protrusion and the groove are not engaged between the time when the tray loading is completed and the time when the clamping is completed, the tray is movable during this time.
If a force is applied in the direction of movement of the tray in such a case, the tray may be moved in this direction and the position of the disk may be misaligned. If the position of the disc shifts in this way, the disc may not be installed on the turntable.
Furthermore, the recording surface of the disk was caught between the turntable and the clamper, which caused damage to the recording surface.

(c) Problems to be Solved by the Invention The present invention aims to provide a disc player that has a simple structure and can reliably prevent tray displacement.

(d) Means for Solving the Problems In a disc player having a cam gear having a cam portion for controlling the clamper, and a transmission gear meshing with the cam gear and transmitting the driving force of the cam gear to the disc transport member, A gear portion of the cam gear is provided with a toothless portion, and a series of protrusions with a predetermined width are provided in the circumferential direction on the toothless portion, and the transmission gear is provided with a toothless portion with which the protrusions engage. The cam gear and the transmission gear were meshed together such that the protrusion of the cam gear and the toothless portion of the transmission gear engaged with each other.

(E) When the disc transport member is moved by the rotation of the working cam gear and positioned at the playable position, the toothless portion of the cam gear reaches the transmission gear, the drive of the transmission gear is stopped, and the movement of the disc transport member is stopped. be done. After that, when the cam gear is rotated further, the clamper is operated accordingly.
At this time, the cam gear is rotated while the protrusion of the cam gear engages with the toothless portion of the transmission gear, so the rotation of the transmission gear is restricted by this engagement, and the tray is thus fixed at the playable position. Ru.

(f) Examples An embodiment of the present invention will be described below.

In FIG. 1, (1) is a main body case, on which mechanical parts such as a loading mechanism are mounted. The main body case (1) has a substantially U-shaped cross section, and half of its upper surface is open (opening).
2), and guide holes (3) (3) and (4) are formed in the vertical direction on both sides of the main body case (1). These guide holes (3) (3) and (4) have bins (6) (
6) and (7) are inserted, and this causes the elevating chassis (5
) is regulated by guide holes (3), (3) and (4) and is movable in the vertical direction.

(8) and (9) are drive slides, each with three sets of sliding holes (1
0) (10) (10) and (11) (11) (11), and are screwed to the sides of the main body case (1) through these sliding holes, so that the It is attached so that it can be slid laterally. In addition, these drive slides (8) < 9) have vertically inclined inclined holes (12).
) (12) and (13) have been drilled, and these inclined holes (12) (12) and (13) are connected to the pins (6) mentioned above.
(6) and (7) are fitted. Further, the inclined directions of these inclined holes (12) (12) and (13) are opposite to each other.

Furthermore, the drive slide (9) has a rack gear (
14) is provided, and a drive gear (15) meshes with this rack gear (14). In this way, the drive slide (9>) is moved by the rotation of the drive gear (15), and this drive slide (9) is moved by the rotation lever (16) as described later. ), the drive slide (8) is also moved at the same time as the drive slide (9) moves.

The aforementioned drive gear (15) has a large diameter gear portion (15) with different diameters.
7) and a small diameter gear part (18), and a large diameter gear part (17).
) are provided with slit holes (19) and (20) at axially symmetrical positions (see Figure 2), and the drive gear (15)
is pivotally supported on the top surface of the main body case (1), and two transmission gears (21, 22) and a motor (23) are similarly supported and mounted on the top surface. Motor (23)
The driving force from the transmission gear (22) is transmitted by the belt (24).
), and further transmitted to the large-diameter gear portion (18) via the transmission gear (21).

Further, a detection element (25) is disposed on the top plate of the main body case (1), and the rotation speed of the drive gear (15) is detected. That is, the detection element (25) has a light emitting element and a light receiving element separated by a predetermined gap, and by sandwiching the large diameter gear part (18) with this gap, the drive gear (15) is activated. Each time the slit holes (19) and (20) pass through the gap during rotation, that is, each time the drive gear (15) makes a half rotation, one electric pulse signal is generated to control the rotational speed of the drive gear (15). Detected.

Furthermore, there is a regulation lever (101) on the top of the main body case (1).
is rotatably supported by a cut-and-raised piece (102), and is urged downward by a spring (108) (
(See FIG. 4), a tongue piece (103) is provided at the rotating end of the regulating lever (101), and faces into the main body case (1) from the opening (2).

A bottom plate <26) is further attached to the main body case (1>), and an insertion opening (28) for attaching a tray box (27) is formed by attaching the bottom plate (26).

The back side of this bottom plate (26) is provided with the aforementioned rotary lever (16).
) is rotatably supported on a shaft, and the driving slides (8) and (9) are attached to both ends of this rotating lever (16) (see Fig. 3). Therefore, as described above, the driving slide (
9) is moved in one direction, the drive slide (8) is moved in the opposite direction.

The elevating chassis (5) has an opening (29) and a through hole (30).
) is perforated, and a protrusion (104) and a recess (105) are provided on the inner edge, and a disc playback mechanism (Ll), a disc fall prevention mechanism (lift), and a disc loading mechanism (Japanese) are also provided. It is installed. Of these, the protrusion (104) engages with the tongue piece (103) of the regulation lever (101) to align the front ends of the trays (78) stored in the tray box (27), that is, the elevating chassis. When the tray box (5) is installed in the lowest position (see Figure 4), the insertion opening 28)
By pushing the tray box (27) in, it comes into contact with the front end of the tray (78) and aligns the front ends of the tray (78). Further, when the elevating chassis (5) is raised, the bent portion (106) provided at the end of the tongue piece (103) of the regulating lever (101) comes into contact with the recess (105) of the elevating chassis (5), and the regulating lever ( 101) in the opposite direction.

The disc playback mechanism (Ll) is mounted on the upper surface of the elevating chassis (5), and includes a spindle motor (34), a turntable (35) pivotally mounted on the drive shaft of the spindle motor (34), and a pickup device (36). ), and the turntable (35) and pickup device (36) face downward from the opening (29) of the elevating chassis (5).

The disk drop-off prevention mechanism (32) is also mounted on the elevating chassis (
5), and is composed of a rotating chassis (37), a cam slide (38), and a drive gear part (39) (see FIGS. 2 and 7), that is, a rotating chassis ( 37) is rotatably supported by a shaft (40), and a spring (43) is stretched between the protrusion (41) and a bottle (42) planted on the top surface of the elevating chassis (5). The rotating end is biased in the direction of approaching the elevating chassis (5). In addition, holding members (44) and (45) are fixed to the lower surfaces of the two rotating ends of the rotating chassis (37), respectively, and these holding members (44 and 45) are attached to the lower surfaces of the two rotating ends of the rotating chassis (37). They face the opening (29) and the through hole (30), respectively.

The cam slide (38) has a long hole (46) in its longitudinal direction.
(47) are drilled therein, and are slidably attached to the elevating chassis (5) by fixing pins (48) and (49) through the elongated holes (46 and 47). Also, rack gears (
50) and a protrusion (51) are respectively provided, and furthermore, this protrusion (51) has a low part (51a) and a high part (51b).
and an inclined portion (51c) connecting these. Furthermore, such a protrusion (51) has a rotating chassis (3
7) The protrusion (52) on the lower surface is in contact with the spring (4).
3) The rotation of the rotating chassis (37) due to thrust is restricted.

The drive gear part (39) includes a pulley (53) and a transmission gear (54).
) (55) and a drive gear (56), each of which is pivotally supported by the elevating chassis (5). Among these gears, the drive gear (56) meshes with the rack gear (50) of the cam slide (38), and also engages with the shaft (57) of the pulley (53).
) passes through the elevating chassis (5) and the elevating chassis (5)
It has reached the back side. Further, this pulley (53) is connected by a belt (60) to a pulley (59) pivotally mounted on the drive shaft of a motor (58), so that the driving force of the motor (58) can be completely transmitted.

The disc loading mechanism (seal) is a lifting chassis (5)
It is placed on the bottom side of the . That is, as shown in FIG. 3, guide members (61) and (62) having guide grooves for guiding the tray are fixed to the back surface of the elevating chassis (5), and a clamp member (63) is fixed to the rotating end of the guide member (61) and (62). Clamp lever with
(64) is rotatably supported. The clamp member (63) faces the turntable (35) from the opening (29) of the elevating chassis (5), and the clamp lever (64) is attached to the spring (100) in the direction of the return table (35). It's in full swing. Further, a dogleg-shaped positioning member (65) is pivotally supported on the back surface of the elevating chassis (5), and this positioning member (65) is biased to rotate clockwise by a spring (66). It has a bin (67) at the rotating end.

Further, a support chassis (68) is supported on the back surface,
On the upper surface of this support chassis (68) is a cam gear (69),
A transmission gear (70) and a feed gear (71) are pivotally supported (see Fig. 6), and a cam gear (69) is connected to an inner diameter gear (69).
a) and an outer diameter gear (69b), and a cam portion 73) is provided on the peripheral wall (72) provided along the outer periphery. Furthermore, in the predetermined arc portion of the outer diameter gear (71), an IJs diameter portion (74
), and a large diameter portion (75) having the same diameter as the outer diameter gear (71) is provided in the lower half portion thereof. The protrusion (64a) of the clamp lever (64) is in contact with the upper part of the circumference 4m (72) of the cam gear (69), and the rotation a of the clamp lever <64) is caused by the bias of the spring (65).
is regulated. Furthermore, the inner gear (6) of the cam gear (69)
9a) is engaged with a gear (75) pivotally attached to the shaft end of the bobbin shaft (57) penetrating from the top of the elevating chassis (5), and receives the driving force from the motor (58). There is.

Further, the transmission gear (70) meshing with the outer gear (69b) of the cam gear (69) is provided with a toothless portion (76) in the lower half of the predetermined arc portion in the thickness direction. The missing tooth portion (76) is the large diameter portion (76) of the cam gear (69).
5). Furthermore, this transmission gear (70
) of the feed gear (71) meshing with the upper gear (71a
) is provided with a toothless portion (77).

FIG. 8 is a diagram showing the tray, and the tray (78>) is provided with a rack gear (79) on the negative side, and a protrusion (80) is provided at the front end of this rack gear (79).

In addition, a hook portion (81) is provided on the front side of the tray 78), and a disk storage portion (82) and an opening (
83) is provided. The tray (78) is housed in the tray box (27) through the opening (84) of the tray box (27), and can be freely moved in and out in the horizontal direction through the opening (84).

Next, the operation of this embodiment detailed above will be explained.

(a) Disk selection operation As mentioned above, the bins (6) (6) and (7) protruding from the side of the elevating chassis (5) are connected to the guide holes (3) drilled on the side of the main body case (1). ) (3) and (4) and are simultaneously fitted into the inclined holes (12012) and (13) drilled in the drive slides (8) and (9). Therefore, as mentioned above, when the drive slide (9) is fully driven by the drive gear (work 5) and at the same time, the drive slide (8) is completely moved in the opposite direction to the drive slide (9) by the rotation lever (16), The elevating chassis (5) has guide holes (3) (3) and (4)
is moved upward or downward along the

FIG. 11 shows the small diameter gear part (18) of the drive gear (15),
0 is a diagram showing the shape of the rack gear (14) of the drive slide (9) As shown in the figure, the small diameter gear portion (18) is provided with groove-shaped gears (18a) (18a) at axially symmetrical positions, and these In the lower half of the side surface between the gears (18a) (18a), a cutout groove (18
b) (18b) and the engaging portion (
18c) (18c) is provided. On the other hand, the rack gear (14) includes a first gear (14a) having a pitch PI, and a second gear (14b) which is half the length of the first gear (14a) and has a pitch P2 (- to p+). are arranged alternately.

Figure 12 shows such a small diameter gear part (18) and rack gear (1
4) is a diagram showing a state of meshing with. After the drive gear (15) rotates in the direction of arrow A and one gear (18a) moves the first gear (14a) in the direction of arrow B, the next gear (18
The gear (14) is not driven until the gear a) comes into contact with the second gear (14b), and at the same time, the retaining part (18c) of the small diameter gear part (18) contacts the first gear of the rack gear (14). (14a) and (14a) are engaged between the rack gear (
14) restricts movement in the longitudinal direction. Then, when the next gear (18a) presses the second gear (14b),
The rack gear (14) is moved in the direction of arrow B again. Therefore, the rack gear (14) is intermittently moved by a pitch P1 every half rotation of the drive gear (15).

When the drive gear (15) is rotationally driven in a predetermined direction in this way, the drive slides (9) and (8)
) is moved intermittently, and therefore, the elevating chassis (5) is intermittently moved upward or downward by the above-described action. The moving distance of one step of the elevating chassis (5), which is moved in steps in this way, is the length of the tray box (27).
) is set equal to the distance between the trays that are fully stored. Also, the slit holes (19) (20) of the drive gear (15)
The positional relationship between the small diameter gear portion (18) and the small diameter gear portion (18) is as shown in FIG. 12, and the detection element (25) is arranged so as to be able to detect the upper slit hole (19) in the state shown in FIG. ing. By arranging it in this way, the drive gear 15
) is detected at the timing when the aforementioned small-diameter gear portion (18) and rack gear (14) are intermittently disengaged from each other during rotation, that is, at the timing when the lifting or lowering of a unit step of the elevating chassis (5) is completed. A pulse signal is output from the element, and unit step movement of the elevating chassis (5) is detected.

Now, the tray box (27) that supports multiple trays (78) is inserted, and the main body case (1) is inserted from Q (28).
Suppose that it is installed inside. At this time, the drive chassis (8) (9
) is in the state shown in FIG. 4, and therefore the elevating chassis (5) is positioned at the lowest position (initial state).

Next, assume that the operator applies a command to the control circuit to play a disc stored in the lowest tray among the trays supported by the tray box (27).

Then, in response to this command, the control circuit controls the motor (23).
A drive current is applied to the motor (23) to rotate the drive gear (15). In this way, the drive gear <1
5) is rotated, the lifting arm (5) is raised the first step by the first half turn of the drive gear (15) as described above, and the projection (80) on the front end of the lowermost tray (78) and the toothless portion (77) of the upper gear (71a) of the feed gear (71) pivotally supported by the elevating chassis (5) (13th
), and when the elevating chassis (5) is raised one step in this way, a pulse signal is output from the detection element (25) to the control circuit as described above, and the elevating chassis (5)
A one-step increase in the motor (23) is detected, and in response to this, the power supply to the motor (23) is completely cut off. The lifting chassis (5) is thus positioned to drive and transport the bottom tray.

(b) Tray loading operation When the bottom tray has been selected as described above, a pulse signal is input from the rudder detection element (25) to the control circuit, and the control circuit outputs the signal to the motor (58). A drive current is applied. When the motor (58) is driven in this way,
This driving force is transmitted to the pulley (53) via the belt, and is further transmitted to the cam gear (69) via the gear (70) which is pivoted on the back side of the elevating chassis (5) of this pulley (53).
transmitted to. In the initial state, the cam gear (69), transmission gear (70), and feed gear (71) are meshed as shown in Figure 6, so the cam gear (69) is driven clockwise by the motor (58) mentioned above. When rotated, the feed gear (71) is rotated clockwise via the transmission gear (70). In the disc selection operation, the toothless portion (77) of the feed gear (71) and the protrusion (8) of the tray (78)
0) is engaged with the feed gear (71) as described above.
) is rotated clockwise, the tray (7) is rotated clockwise.
8) is pulled out from the tray box (27), supported by the guide members (61, 62) on the lower surface of the elevating chassis (5), and carried toward the elevating chassis (5).

At this time, the clamp lever (64) is connected to the cam gear (69).
), the protrusion (64a) of the clamp lever (64) engages the cam portion (73) of the cam gear peripheral wall (72).
Since it is separated from the clamp, its rotation is still restricted and the clamp is kept in the unclamped position.

Then, when the tray (78) is further carried in, the transmission gear
The toothless portion (76) of the cam gear (69) is connected to the large diameter portion (
75) and the toothless portion (76) of the transmission gear (70).
) Since the upper tooth portion faces the small diameter portion (74) of the cam gear (69) (see FIGS. 15(a) and (b)), even if the cam gear (69) further rotates, the transmission gear (70) It does not rotate any further, and the transmission gear (70) is further locked by the engagement between the large diameter portion (75) and the toothless portion (76) (16th
(see Figures (a) and (b)), thus the tray (78)
The conveyance by the feed gear (71) is completed.

Immediately before the tray (78) is conveyed,
The hook (81) of the tray (78) comes into contact with the pin (67) of the positioning member (65) on the lower surface of the elevating chassis (5), and presses the pin (67) of the positioning member (65) to move the positioning member (65) to the spring (66).
) Rotate against the upward force. and tray (78)
When carrying the pin (67) into the inclined part (81a) of the hook part (81)
), and then the spring (66)
Due to the elastic force accumulated in the tray (78), the backlash between the gears causes the tray (78) to be slightly sent in the loading direction, and the pin (67) engages with the retaining part (81b> of the hook part (81)). The tray (78) is positioned at the loading position (see Figure 9).

The tray loading operation is completed in the above manner.

(c) Disc Clamping Operation Immediately after the loading of the tray (78) is completed as described above, the protrusion (64a) of the clamp lever (64) reaches the cam portion (73) of the peripheral wall of the cam gear (69). After that, when the cam gear (69) rotates further, the clamp lever (
64) rotates under the control of this cam portion (73), and the clamp member (63) is accordingly displaced upward.

In the disk loading operation, the tray (78) has its opening (83) positioned above the clamp member (63), so when the clamp member (63) is displaced upward in this way, the tray (78) is moved from the opening (83). The disc is supported by a clamping member (63), and the disc is further supported by a clamping member (63).
3), the disk is pressed against the turntable (35).

The disc clamping operation is completed in the above manner.

(d) Disk drop prevention operation This operation is performed by the disk drop prevention mechanism (L2). In the initial state as shown in Fig. 2, the cam slide (
38) is positioned in the direction of the arrow. At this time, the rotating chassis (37) has a protrusion (
52) comes into contact with the low striped portion (51a) of the cam slide (38), thereby restricting its rotation, and the holding members (44) and (45) provided at the rotation ends of the cam slide (38) press the opening (29) and It protrudes from the through hole (30) toward the lower surface of the elevating chassis (5).

When the disk carrying operation is executed from the state where the disc is loaded and the motor (58) is driven, the driving force of the motor (58) is transferred to the drive gear (58) via the pulley (53) and transmission gears (54) and (55). 56), thereby moving the cam slide (38) in the direction of arrow D'. Even if the cam slide (38) is moved in this way, the protrusion (52) of the rotating chassis (37) will slide on the low striation (51a) of the cam slide (38) for a while, so the rotating end will not be displaced. Therefore, the holding members (44) and (45) remain protruding toward the lower surface of the elevating chassis (5). Such a state is a protrusion (52
) continues until it reaches the inclined portion (51c) of the protrusion (51), which coincides with the timing at which the tray (78) reaches the loading completion position in the disk loading operation.

This operation prevents the disk from jumping out of the storage section (82) of the tray (68) when the tray (68) is carried in, that is, the holding members (44) and (45) protrude from the lower surface of the elevating chassis (5). By doing so, the tray (6
It is positioned slightly above the disk stored in the storage section (82), and serves to hold down the disk from above when it starts to fly out of the storage section (82) due to, for example, an impact.

Then, when the cam slide (38) is able to move further in the direction of arrow D', the protrusion (52) is lifted by the inclined part (51c) of the protrusion (51), and the rotating chassis (37)
) are rotated against the force, and the presser members (44) (45)
is displaced upward. At this time, the clamping operations are simultaneously terminated, and the holding members (44) and (45) are displaced upward in this way, thereby making it possible for the clamping members to lift the disk.

By the above operations (a), (b), (c), and (d), the tray placed at the bottom of the tray box (27) is not selected, and the disc stored in this tray is moved to the turntable (35). ) and playback is performed.

When the playback of such a disc is completed, the disc is returned to the tray box by following the above procedure in reverse.

That is, when the reproduction of the disc is completed, the motor (S8) is driven to rotate in the opposite direction to that at the time of loading, and the cam gear (69) is accordingly rotated in the opposite direction. Therefore, the clamp lever (64) is rotated by the cam portion (73) of the cam gear (69), and the clamp member (63) is accordingly separated from the turntable (35). When the clamp member (63) separates from the turntable (35) in this manner, the disc is supported by the clamp member (63) and is displaced downward, so that the disc is moved into the storage section (82) of the tray (78).
stored inside.

At the same time as the clamp is released, the cam slide (38) is completely moved in the direction opposite to the direction at the time of loading by driving the motor (58). and the inclined part (5) of the cam slide (38).
1c) rotates the rotating chassis (37) in the biasing direction, whereby the holding members (44) (45> protrude downward from the opening (29) and through hole (30) of the elevating chassis (5). This prevents the disc from falling off as described above.

Thereafter, the cam gear mechanism 9) and the transmission gear (70) are engaged, and the tray (78) is driven to be carried into the tray box (27). 1 incorporation is completed.

Now, in this state, the elevating chassis (5) is positioned at the bottom tray, but next time when you select and play another disc from here, for example the 6th disc from the bottom, First, the sixth disk from the bottom is selected in the same way as the disk selection operation described above. That is, the drive gear (15) is rotated by the drive of the motor (23), and the elevating chassis 5) can be raised stepwise. Then, the control circuit counts the number of pulses output from the detection element (25), and when the number of pulses reaches 5, the motor (25)
The drive current to 3) is completely cut off, and the drive of the motor (23) is stopped. Therefore, the elevating chassis (5) is raised by the number of steps corresponding to the above-mentioned number of pulses, ie, 5 steps, ie, positioned at the position of the sixth tray from the bottom. At this time, the toothless portion (77) of the feed gear (71) of the elevating chassis (5) repeatedly engages with the protrusion (80) on the front end of the tray (78), but as shown in FIG. 77)
Since there is a gap between the and the protrusion (80) when engaged,
The tray (78) is not caught by the feed gear (71>) when ascending, and the movement of the elevating chassis (5) is not hindered.

After the elevating chassis (5) is positioned as described above,
Loading of the disc is carried out in the same manner as described above. When the reproduction is finished and there is no command for the next disc to be reproduced, the elevating chassis (5) is moved to the lowest position, that is, the initial position. When removing the tray box (27), the drive slide (8) is moved in the direction of arrow C' in Fig. 5, and this stroke displaces the locking member (107) protruding from the side of the insertion slot (28). The locking member (107) is disengaged from the engaging portion (not shown) on the side surface of the tray box (27), allowing the tray box to be pulled out.

(G) Effects of the Invention According to the disc player of the present invention, when the disc transport body is positioned at a playable position where the center hole of the disc faces the turntable, the disc transport body is free to perform all subsequent clamping and playback operations. Since it is fixed at the playable position, the disc carrier does not shift its position.
Therefore, the disc can be safely and reliably mounted on the turntable. Furthermore, such effects can be achieved by simply changing the configuration of the gear portions of the two gears used in the prior art, so no extra members are required and the configuration is simple.

[Brief explanation of the drawing]

Each of the figures shows an embodiment of the present invention; FIG. 1 is an exploded perspective view of the main parts, FIG. 2 is a top view, FIG. 3 is a bottom view, FIG. 4 is a front view, and FIG. 6 is a perspective view showing the loading gear, FIG. 7 is a perspective view showing the disc drop-off prevention mechanism, FIG. 8 is a perspective view showing the relationship between the loading gear, the tray, and the tray box. Figure 9 is a plan view showing the state of the tray in the imaging completion position, Figure 10 is a side view showing the relationship between the turn gear and the clamper, and Figure 11 is a perspective view showing the shape of the small diameter gear portion of the rack gear and drive gear. , FIG. 12 is a plan view showing the meshing relationship between the rack gear and the drive gear, and FIG. 13 is a plan view showing the meshing relationship between the rack gear and the drive gear. ．． 14 is a perspective view showing the relationship between the projections of the feed gear and the projections of the tray, and FIG. 15(a)
16(b) is a top view and a back view showing the moment when the engagement between the outer gear of the cam gear and the transmission gear is released, and FIG. 16(a)
) and (b) are a top view and a back view showing a state after the engagement between the outer diameter gear of the cam gear and the transmission gear is released. ri69)...Cam gear, (70)...Transmission gear, (
74)... Small diameter part (toothless part), (75)... Large diameter part (projection), (76)... Missing tooth part.

Claims (1)

[Claims] (1) A cam gear having a cam part for controlling the clamper,
In a disc player having a transmission gear that meshes with the cam gear and transmits the driving force of the cam gear to the disc conveying member, the gear portion of the cam gear is provided with a toothless portion, and the toothless portion is further provided with a toothless portion in the circumferential direction. A series of protrusions with a predetermined width are provided, and the transmission gear is provided with a toothless part that the protrusions engage with, and the cam gear and the transmission gear are connected to each other by the protrusion of the cam gear and the toothless part of the transmission gear. A disc player characterized in that the disc players are meshed so as to engage with each other.