JPH0643882Y2 - Load mechanism for insertion / ejection roller of compact disc player - Google Patents

Description

Detailed Description of the Invention [Outline] Increasing the force of a biasing spring in a load mechanism in which a roller for inserting a disc into a compact disc player or ejecting the disc from the compact disc player is pressed against the disc with an appropriate force. The lever is used to generate a stable pressure contact force with a weak spring, and the operation force required to retract the roller after the disc is clamped on the turntable is reduced. Furthermore, whether the disc is in the player or not. Can be detected by utilizing the enlarged displacement of the lever corresponding to the position of the roller.

[Industrial application field]

The present invention relates to a slot-in type compact disc player used for in-vehicle use, for inserting a disc,
The present invention relates to a roller load mechanism provided for ejection, and more specifically, it enables smooth support and operation of the roller, and also enables detection of the presence or absence of a disc in the player. It is about.

[Conventional technology]

The disc inserted into or ejected from the compact disc player is transferred by the rubber roller contacting the lower surface of the compact disc player, but the roller is pressed to the disc with a proper strength (loading the roller). For this purpose, a spring is directly applied to the shaft of the roller, or, as shown in FIG. 5, a swingable lever L supporting the shaft of the roller R is biased by a spring S.

Further, in order to detect the presence or absence of a disc in any state in the player,
The presence or absence of the disc is discriminated by the combination of signals by using the fact that the light is blocked at the opaque part of the disc by installing optical sensors at multiple places. Two kinds of discs D ₁ , D ₂
When using, the same sensor cannot discriminate the presence or absence of the disk, so that it is necessary to provide a large number of optical sensors s in the housing H as shown in FIG.

[Problems to be Solved by the Invention]

According to the prior art in which a spring is directly applied to the roller shaft as a roller load mechanism, it is necessary to provide the spring near the roller shaft, but many other parts are provided in the vicinity, so the range of motion of the spring can be limited. There is a space constraint that it cannot be large.

As shown in FIG. 5, when the swing lever L that supports the roller shaft is biased by the spring S, the effective length A of the lever L and the spring S
The relationship between the arm length B of the moment due to the force P of A is inevitably A> B in the structure shown in FIG. 5, so the relationship between the force P of the spring S and the crimping force Q of the roller R. Is P>
Therefore, it is necessary to use a very strong spring (having a large spring constant) as the spring S, and a spring having such a large spring constant has a large change in force according to the change in length. It cannot be said that it is suitable to press the roller against the disk with almost uniform force under any condition.

In these conventional roller load mechanisms, when the roller is retracted to a position where it does not contact the disk after the disk is clamped on the turntable, it is necessary to push down the roller shaft against the force of the spring. Will put a large load on the motor that controls the position of
In any case, there are some factors that may hinder smooth operation.

Also, from a different point of view, when an optical sensor is used to determine the presence / absence of a disc in the player, it is necessary to install a large number of optical sensors especially in a player that also uses large and small discs. Since many devices such as its drive mechanism and pickup are installed, it is difficult to take space to install a large number of optical sensors, and even if it could be installed, the structure would be complicated and the cost would increase. To do. In this case, since the signals of a large number of sensors are combined and discriminated, the reliability remains a problem.

[Means for Solving the Problems]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems of the prior art in the load mechanism of the disc insertion / ejection roller provided in the compact disc player, the present invention is pivotally attached to the housing and relatively close to the pivot point. A lever having a recess for receiving the roller shaft pressed against the disc at a position and a spring action point at a position relatively distant from the pivot point, one end of which is attached to a housing and the other end of the spring acts as By mounting the shaft of the roller, which is supported by another swing lever, in the concave portion while being attached to the point, the force of the spring is increased as a force in the direction in which the shaft of the roller is pressed against the disk. Transmitting to a roller, setting the shape of the recess so as to press the roller against the disc,
Further, a guide edge for the shaft of the roller is provided on the lever following the recess, and when the roller is moved to the retracted position after the disc is clamped on the turntable, the bias of the spring is applied. A switch that sets the shape of the guide edge so that a component force in a direction that hinders the movement of the roller to the retracted position is not generated, and in other cases, engages near the action point of the spring on the lever. The presence or absence of the disc in the player can be mechanically detected by the enlarged change in the position near the action point corresponding to the change in the position of the roller.

[Action]

Since the present invention has the structure as described above, the force for pressing the roller against the disk is transmitted from the spring to the shaft of the roller through the action point of the lever and the recess of the lever.
Since the recess is located relatively close to the pivot point of the lever and the point of action of the spring is located far from the pivot point, the lever ratio increases the force of the spring to be transmitted to the roller. . Therefore, the spring can be weaker than the conventional one, and the set position of the spring is
It is possible to freely select a movable member, avoiding the vicinity of the roller where it is concentrated. In this way, by applying the force of the spring to the roller without difficulty, it is possible to exert a stable pressure contact force without great fluctuation on the disc.

Further, in the present invention, since the guide edge is provided following the concave portion of the lever, when the disc is clamped on the turntable and the roller is retracted, the component force of the spring that propels the roller toward the disc is reduced. If it is alive, it will be a burden on the motor that controls the position of the roller, but in the case of the present invention, the force of the spring is moved to retreat the roller shaft along the guide edge of the lever having a shape that eliminates the component force. Does not generate harmful component force as described above. As a result, the drive system operates smoothly without receiving a large resistance.

Furthermore, since the lever used in the present invention has the lever ratio as described above, the displacement of the roller that occurs when the roller catches the disk appears as a large displacement at the point of action of the spring, and therefore the displacement near the point of action is affected. When a matching switch is provided, it is possible to clearly determine whether or not there is a disc in the player by displacing the lever. It goes without saying that when the disc is clamped on the turntable and the roller is retracted, the displacement of the lever is further increased, so that the signal that the disc is in the player continues.

〔Example〕

FIG. 1 is a perspective view of a compact disc player equipped with the mechanism of the present invention as seen from the left side. In the figure, 1 is a casing of a compact disc player, 2 is a compact disc insertion / ejection slot, 3 is a fixed guide constituting the upper half thereof, and 4 is a swingable guide constituting the lower half thereof. The swing arm 5 integrated therewith is pivotally attached to the housing 1 by a pin 6 and can be tilted around the pin 6 together with the guide 4.

A lever 8 swinging by a pin 7 is pivotally attached to the housing 1, and one end of a shaft 9s of an elongated rubber roller 9 for inserting and ejecting a disc is supported at its right end. The left end of the swing arm 5 is a fork 5f, and its two legs are engaged with the shaft 9s of the roller 9 via a resin bush 9b.

The swing arm 5 is integrated with a swing arm having a similar shape (not shown) on the right side of the insertion / ejection port 2 by a plate 5p to which the guide 4 is attached, and its fork is attached to the other end of the roller shaft 9s. Engaged.

Rotational force for inserting and ejecting the compact disc by the roller 9 is supplied from the other end side of the shaft 9s (not shown), and the disc is inserted by the left rotation of the roller 9 and ejected by the right rotation. The rotational force that causes the swing arm 5 to swing around the pin 6 is also supplied from the other end side of the roller 9 (not shown). A large number of levers and arms on the side surface (left side) shown in FIG. 1 are all moved by the rotational force around the pin 6 transmitted from the other end side to the swing arm 5 via the plate 5p.

When the disc is sandwiched by the insertion / ejection slot 2 and placed on the roller 9, a motor (not shown) is activated by detection of an optical sensor or the like, and the roller 9 is rotated counterclockwise in FIG. 1 to move the disc to the left in the figure. Transfer to a certain turntable 10. During this transfer, the roller exerts a moderate amount of contact pressure on the disc. When the disk is placed on the turntable 10, the clamper 11 descends to sandwich the disk with the turntable 10 and support the disk so that the disk is rotationally driven on the shaft 12. At this time, the roller 9 moves down to the position where it does not hinder the rotation of the disk by the same motor force as the clamper 11 moves down.

In order to make these operations smoothly, in the illustrated embodiment, a Z-shaped lever 14 pivotally attached to the housing 1 by a pin 13 is used.
The lever 14 is biased clockwise by a tension spring 15 in FIG. The lever 14 is provided with a recess 16 into which the shaft 9s of the roller 9 can enter, and a guide edge 17 connected to the recess 16, as clearly shown in FIG. And an ear piece (point of action of the spring 15) 18 to which the other end of the tension spring 15 attached to the housing 1 is attached,
The ear piece 20 that operates the micro switch 19 on the housing 1
The lever 14 is provided on the lower portion of the lever 14 that extends long.

Next, the operation of the illustrated embodiment will be described. FIG. 2 shows a resting state in which there is no disc on the insertion / ejection slot 2 or on the turntable 10. The lever 14 moves around the pin 13 by the force F of the tension spring 15 acting on the ear piece 18. It is in a position rotated to the right end. The micro switch 19 is pushed in to be turned on, and emits a signal indicating that the disk is not in the housing 1. At this time, the spring 15 urges the roller shaft 9s in the recess 16 of the lever 14 with force f in a direction perpendicular to the line of the recess. Therefore, the vertical component force f ₁ (upward direction) of this force f causes the swing arm 5 to rotate right around the pin 6 and the swing lever 8 to rotate left around the pin 7 to bring the roller 9 to the highest position. Has been pushed up.

Insert and eject part of the compact disc to listen to music 2
When lightly inserted, the motor is driven by the action of the optical sensor and the roller 9 starts to rotate in the insertion direction. When the disc is sandwiched between the fixed guide 3 and the roller 9 with a force slightly larger than the vertical component force of the force f, the roller 9 is slightly pushed down, and the gap between the fixed guide 3 and the first guide increases slightly. As shown in the figure, the disc is allowed to pass. At this time, the micro switch 19 is turned off, indicating that there is a disc in the player. The roller 9 is given a double taper shape in which the central portion has the smallest diameter and the diameter gradually increases toward both ends.
As the disc is transported, the roller 9 has to move to a lower position, and the roller shaft 9s moves the vertical component of force f'by the spring 15 as shown in FIG.
It is pushed down against f ₁ ′ (upward).

The disc reaches the top of the turntable 10, and the clamper 11 descends by the force of the same motor, and in conjunction with the operation of clamping the disc, the lever 14 is moved to the first position by a gear and link mechanism (not shown). In FIG. 3, the operation of further rotating the pin 9 to the left and further lowering the roller 9 occurs. The reason why the roller 9 is lowered is to prevent the disc from interfering with the rotation of the turntable 10. In the normal mechanism, the roller is pushed down against the force of the spring that pushes up the roller, so that a large load is applied to the motor at this time.

In the illustrated embodiment of the present invention, the shape of the guide edge 17 is set to be almost vertical in this state, so that the force f ″ of the spring 15 exerts a force f on the roller shaft 9s. Since ″ is lateral and the vertical component force f ₁ ″ is downward, it does not serve as a motor load for pushing down the shaft 9s of the roller 9. In this embodiment, the guide edge 17 is the lever.
Since it is set to pass the vertical line at the end position of the counterclockwise rotation of 14, the increase in the force required to push down the roller 9 shows a negative value. This allows a series of operations to be performed extremely smoothly. 2 to 4, f ₂ , f ₂ ′ and f ₂ ″ are component forces of the swing lever 8 in the direction of the rotation axis 7.

Further, according to the present invention, since the ear piece 18 is provided near the switch 19 at the lower end of the lever 14 of the illustrated embodiment and the spring 15 is hung on the ear piece 18, as shown in FIGS. When 9s is in the recess 16 of the lever 14, the large lever ratio of the lever 14 increases the force of the spring 15, and even a relatively small force of the spring 15 stably generates a sufficient pushing force on the roller 9. Can be done. In other words, even if the spring 15 is small and weak and does not take up a lot of space, the lever 14 can apply the force necessary for holding the disk to the roller 9 by the lever 14 without a large change.

More importantly, the position of the lever 14 is detected by the micro switch 19 so that the disc is inserted into the player (there are various states as shown in FIGS. 1, 3 and 4). , And the micro switch 19 emits an OFF signal in each case.)
As shown, the microswitch 19 emits an ON signal. ) And can be reliably recognized mechanically. With this advantage, the compact disc is 12 cm
Whether it's 8 cm or 8 cm, there is no need to install a detection system that uses multiple optical sensors, the structure can be simplified and cost can be reduced, and the location of the sensor can be a problem. No, and moreover, failure is less likely to occur.

Even if the difference in the height position of the roller 9 due to the thickness of the disc is small, the difference is magnified by the lever ratio of the lever 14,
It can be clearly identified by the microswitch 19 and its lever 14 has the function of increasing the force of the tension spring 15. Moreover, the guide shaft 17 of the lever 14 is mounted on the roller shaft.
As 9s descends almost vertically, the retraction of the roller 9 after clamping the disc on the turntable 10
Since the present invention is characterized in that it can be smoothly performed without increasing the load on the motor, the present invention is not limited to the illustrated embodiment, and various modifications can be made in the same spirit.

[Effect of device]

Since the present invention has the structure and operation as described above, it is possible to generate a necessary pressure contact force of the roller with respect to the disk by using a relatively weak spring, and the pressure contact force fluctuates rapidly due to the displacement of the roller. Not showing a stable value.
Since the spring can be installed in a space apart from the roller, there is no space problem.

After the disc is clamped on the turntable, the retracting of the roller is not performed against the bias of the spring, so the load on the motor that controls the position of the roller does not increase suddenly and the control is smoothly performed. Done.

When the displacement of the roller is detected by utilizing the action of expanding the displacement by the lever, the presence or absence of the disc in the player can be reliably determined. When this means is used, no detection means using an optical sensor or the like is required, which leads to cost reduction. Further, according to this means, detection is possible regardless of the size of the disc.

[Brief description of drawings]

FIG. 1 is a side perspective view of a compact disc player having the mechanism of the present invention, FIGS. 2 to 4 are side views showing respective operating states of a lever, which is the skeleton of the mechanism, and FIG. 5 is an example of a conventional mechanism. FIG. 6 is a side view showing a disk detecting means according to the prior art. 1 ... Housing, 2 ... Insertion, discharge port (insertion / discharge port), 3 ... Fixed guide, 4 ... Swing guide, 5 ... Swing arm, 5f ... Fork, 5p ... Plate, 6 , 7 ... pin, 8 ... swing lever, 9 ... roller, 9s ... roller shaft, 9b ... bush, 10 ... turntable, 11 ... clamper, 12 ... axis, 13 ... pin ( Pivot point), 14 ... Lever, 15 ... Extension spring, 16 ... Recess, 17 ... Guide edge, 18 ... Ear piece (point of action), 19 ... Micro switch, 20 ... Ear piece, R: roller, L: rocking lever, S: spring, H: housing, s: optical sensor.

Claims (3)

[Scope of utility model registration request] 1. A recess for receiving the shaft of a roller pivotally mounted on the housing and pressed against the disk at a position relatively close to the pivot point, and a guide for the shaft of the roller formed subsequent to the recess. A lever having an edge and a spring action point relatively far from the pivot point, one end of which is attached to a housing, the other end of which is attached to the action point, and another swing By receiving the shaft of the roller supported by the lever in the recess, the force of the spring is increased as a force in the direction of pressing the shaft of the roller against the disk and is transmitted to the roller, thereby the roller. A load mechanism for a disc insertion / ejection roller in a compact disc player, wherein the shape of the recess is set so as to press the disc against the disc. 2. The guide edge is provided in such a direction as to prevent the roller from moving to the retracted position by the bias of the spring when the roller is moved to the retracted position after the disc is clamped on the turntable. The load mechanism of the disc insertion / ejection roller in the compact disc player according to claim 1, wherein the shape is set so that no force is generated. 3. A switch that engages near the point of action of the spring, which is relatively far from the pivot point on the lever, is provided, and the position near the point of action corresponding to a change in the position of the roller is enlarged. The load of the disc insertion / ejection roller in the compact disc player according to claim 1, wherein the presence / absence of a disc in the player can be mechanically detected by the change. mechanism.