JPH0325324Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Technical Field" The present invention reliably moves a compact disc placed on the turntable of a compact disc player without applying lateral pressure to the turntable.
The present invention also relates to a disk clamp mechanism that clamps the disk at an appropriate pressure.

"Prior Art and its Problems" Conventionally, the following methods have been considered for clamping compact discs. That is, as shown in FIG. 7, a magnet 2 is mounted inside the clamper 1, and an iron ring 4 is mounted on the turntable 3. Then, by sandwiching the disk 5 between the clamper 1 and the turntable 3 and adsorbing it, the turntable 3
It is designed to rotate. However, when using the above method, not only is the weight of the magnet 2 itself increased, but a considerable force must be applied by a spring or motor (not shown) to remove the magnet 2, and the entire device must be used for this purpose. A problem has arisen in that the thickness of the material increases.

Therefore, in order to eliminate the clamping method using magnetic adsorption and to make the entire device thinner and lighter, we decided to
The idea shown in the figure has been proposed. In this method, a ball 7 is arranged on the axis of the clamper 6, and this ball 7 is pressed by a presser plate 8.
The purpose is to clamp a compact disc 10 on a turntable 9. According to this method, although it is possible to reduce the thickness and weight of the entire device, it causes the following problems.
That is, as shown in FIG. 9, when the presser plate 8 that presses the ball 7 is tilted, component forces S1 and W1 act on the presser force F1 generated on the presser plate 8, and as a result, the force is applied to the ball 7 via the ball 7. W2=W on the clamper side
1 and S2=S1 component force acts. The component force S2 then applies a lateral force to the motor shaft, thereby applying lateral pressure to the motor bearing. As a result, the motor bearing wears out and the turntable rotates unevenly.

``Purpose of the invention'' This invention is designed to generate only axial force in the clamper itself even when the presser plate is pressed against the clamper at an angle, thereby preventing lateral pressure from being applied to the motor bearing. To provide a disk clamp mechanism for a compact disk player that can stabilize rotation, reduce the load on a motor bearing, and maintain the pressing force of a clamper at an appropriate pressure regardless of variations in the pushing stroke of a tray. The purpose is to

"Summary of the invention" In order to achieve the above object, the disc clamping mechanism of the compact disc player of the invention has a base that rotates in the direction toward the player body and in the direction away from the player body on the top chassis of the compact disc player. a pressure arm that is movably pivoted and rotates downward when a tray containing a compact disk is entered; a clamper holder provided on the pressure arm at a position facing the player body; and a clamper holder that is loosely fitted into the clamper holder. It consists of a clamper and a ball press-fitted into the pressure arm side of the clamper holder, and the pressure arm has a base portion that absorbs variations in the advancing stroke of the tray and adjusts the pressure applied to the compact disk by the clamper to an appropriate pressure. It has an absorption mechanism, and the ball, the clamper holder, and the clamper are arranged concentrically, and the ball presses the clamper.

``Embodiments of the Invention'' Below, preferred embodiments of the disc clamp mechanism of the compact disc player of the invention will be described with reference to the drawings.

FIG. 6 shows the overall appearance of the compact disc player. A power switch 12, a music selection storage display section 13, an eject button 14, a switch group 15, etc. are arranged on the front surface of the compact disc player 11. A mechanism section 16 is built in as a unit in the left half of the entire compact disk player 11, and a tray 17 for accommodating a compact disk 23, which will be described later, can move forward and backward within the mechanism section 16. Reference numeral 18 denotes an insertion section for inserting the tray into the mechanism section 16, and its opening/closing lid protrudes from the front surface of the compact disc player 11 as a whole.

As shown in FIGS. 1 and 2, the mechanism section 16 consists of a player main body 19, a pressure arm 20, and a clamp mechanism section 21 connected to the pressure arm 20. At the center of the player body 19 is a turntable 2 whose axis is vertical.
2 protrudes and is used to mount a compact disk 23. A positioning pin 24 protrudes coaxially on the turntable 22, and this positioning pin 24 is inserted into the central circular hole of the compact disk 23 mounted on the turntable 22, and the compact disk 23 is connected to the positioning pin 2.
4, so that it can be rotated concentrically without eccentricity. A motor (not shown) for rotating the turntable 22 is built into the player main body 19.

The pressure arm 20 is connected to the top chassis 25.
It is rotatably connected to a shaft 28 via a pair of bending pieces 27 at the end sides of a punched part 26 formed in the center thereof. As shown in FIG. 3, the pressure arm 20 has an upper plate part 29 and a lower plate part 30 connected to each other via a shaft 28. Window hole 31 in section 29
A tension spring 32 is interposed therethrough. This tension spring 32 holds the upper plate part 29 and the lower plate part 30 together through a stopper 33 (described later), absorbs variations in the advancing stroke of the tray 17, and prevents overclamping by the clamp mechanism part 20. It has a relaxing effect. A stopper 33 is formed at the end of the lower plate part 30 opposite to the shaft 28 by being bent upward, and comes into contact with the lower surface of the upper plate part 29 to maintain its integrity with the upper plate part 29. . The rear end portion of the upper plate portion 29 is bent vertically downward,
This serves as a contact portion 34 of an adjustment mechanism portion (not shown) that adjusts the swing width of the pressure arm 20.
Further, an arm portion 35 protrudes from the side end portion of the lower plate portion 30, and a tongue piece 36 is formed diagonally downward from the arm portion 35. When the tray 17 enters a predetermined position, a trapezoidal wedge 37 protruding from the tip of the tray 17 in the advancing direction comes into contact with the protrusion 38 of the tongue 36, causing the tongue to
6 upward and presses the pressure arm 20 toward the player main body 19 via the shaft 28.

Also, the pressure arm 2 is rotated around the shaft 28.
A tension spring 39 is interposed in the pressure arm 20 in order to assist the rotation of the pressure arm 20 in a direction away from the player body 19 side, that is, in a non-clamping direction. This spring 39 passes through a side notch 40 of the upper plate part 29, has one end attached to a locking plate 41 passed to the punched part 26 of the top chassis 25, and the other end attached to the shaft 2.
8, and urges the pressure arm 20 in the non-clamping direction.

The clamp mechanism section 21 is located opposite the player main body 19. The details of this clamp mechanism section 21 are shown in FIG. That is, a ball 43 is press-fitted into the lower surface of the pressure arm 20 through a seat 42 at the center opposite to the axis of the positioning pin 24, and concentrically with the ball 43 is a cylindrical flange 44 inside the opening. A clamper holder 45 is provided. A clamper 46 is loosely fitted into the clamper holder 45.
The clamper 46 has a flange 47 on its outer periphery to prevent the clamper 46 from detaching from the clamper holder 45. The lower surface of the clamper 46 is an annular clamping surface 48 for pressing the compact disk 23, and the center portion of the lower surface of the clamper 46 has a diameter larger than the outer shape of the positioning pin 24 to avoid contact with the positioning pin 24. A slightly larger recess 49 is formed. Further, a small-diameter recess 50 is formed on the back side of the recess 49, that is, at a position facing the ball 43 press-fitted into the pressure arm 20. When the clamp mechanism section 21 is in a state where the compact disk 23 is clamped, the ball 43, the clamper holder 45, and the clamper 46 are arranged concentrically. The thickness of the clamper holder 45 is set so that a gap of 2 mm or more is created so that the lower surface of the flange 44 of the clamper holder 45 and the upper surface of the compact disk 23 do not come into contact when the compact disk 23 is clamped.

Next, the effect will be explained.

Tray 17 containing compact disk 23
When the tray 17 is fed to a predetermined position in the mechanism section 16 automatically or manually, a wedge 37 protruding from the tip of the tray 17 is inserted into the projection 3 of the tongue piece 36 provided on the lower plate section 30 constituting the pressure arm 20.
8. When the tray 17 is further fed in, the wedge 37 presses the protrusion 38 and presses the tongue piece 36.
push upward. When the tongue piece 36 is pushed up, the upper plate part 29 is pulled by the action of the spring 32, and the pressure arm 20 begins to rotate toward the player body 19 via the shaft 28, and the clamp mechanism part 2
1 extends the player body 19 while stretching the spring 39.
descend towards. When the wedge 37 continues to be pushed up toward the tongue piece 36, the positioning pin 24 of the player body 19 is inserted into the recess 49 of the clamper 46 of the clamp mechanism 21, and the clamp surface 48
comes into contact with the upper surface of the compact disk 23. In this state, the preparation for clamping the compact disk 23 is completed. When the tongue piece 36 is further pushed up, the pressure arm 20 is lowered together with the clamper holder 45 while the clamper 46 remains in contact with the compact disk 23, and the pressure arm 20 is lowered together with the clamper holder 45.
The ball 43 press-fitted into the lower surface of the clamper 46 comes into contact with the upper concave surface 50 of the clamper 46. At this time, the ball 43, clamper 46, and positioning pin 24 are coaxially located. When the tongue piece 36 is further pushed up in this state, the pressure arm 20 is moved by the spring 3.
2, the clamp mechanism section 21 is pressed by the player body 19, and accordingly, the ball 43 presses the clamper 46, the clamper 46 presses the compact disk 23 in a connected manner, and the compact disk 23 is pressed against the turntable. 22. The principle of operation of the clamp at this time is shown in FIG. That is, since the ball 43 is press-fitted into the pressure arm 20 side, even if the pressure arm 20 is in an inclined state during clamping, the pressure force S1, W is applied to the pressure arm 20 side with respect to the clamping force F1.
Even if a component force of 1 is applied, only a clamping force of W2 is generated on the clamper 46 side. Therefore, even if the wedge 37 of the tray 17 further pushes up the tongue piece 36, only the lower plate part 30 that constitutes the pressure arm 20 rotates slightly around the shaft 28, and expands against the tensile force of the spring 32. Just do it. This expansion of the lower plate portion 30 absorbs variations in the advancing stroke of the tray 17 and alleviates overclamping by the clamper 46. Therefore, the clamper 46 is in a state where it clamps the compact disk 23 at an appropriate pressure.

Next, release of the clamp on the compact disc 23 will be explained.

When the tray 17 is moved backward, the expanded lower plate part 30 is first closed by the tensile force of the spring 32, and the stopper 33 comes into contact with the lower surface of the upper plate part 29. Then, the tensile force of the spring 39 is applied, the pressure of the pressure arm 20 towards the compact disk 23 is released, the pressure on the clamper 46 by the ball 43 is removed, the clamper 46 is separated from the ball 43, and the clamper holder 45 It is loosely fitted inside. At the same time, the pressure arm 20
8 as a fulcrum, the clamping surface 48 of the clamper 46 is separated from the compact disk surface. When the pressure arm 20 is pulled up to a predetermined position, the clamp release operation is completed.

"Effects of the Invention" As explained above, the clamping mechanism of the compact disc player of the present invention press-fits a ball into the pressure arm side, and this ball presses the compact disc via the clamper.
Since only a clamping force is generated in the clamper and no component force is generated, the compact disk can be reliably clamped even if the pressure arm is tilted. Therefore, no lateral pressure is applied to the bearing of the motor that rotates the turntable, allowing stable rotation of the turntable and reducing the load on the bearing. Further, since an overclamp absorption mechanism is provided at the base of the pressure arm, it is possible to clamp the tray at an appropriate pressure regardless of variations in the tray entry stroke.

[Brief explanation of drawings]

Fig. 1 is a front view of the disk clamp mechanism according to the present invention, Fig. 2 is a plan view of Fig. 1, and Fig. 3 is a
FIG. 4 is an exploded perspective view of the mechanism of the present invention; FIG. 4 is an enlarged cross-sectional view of the clamp mechanism of the mechanism of the present invention; FIG. 5 shows the relationship between the pressing force and component force of the clamp mechanism of FIG. FIG. 6 is an overall schematic perspective view of a compact disk player incorporating the mechanism of the present invention, and FIGS. 7 to 9 are schematic sectional views showing a conventional disk clamping method. 17...Toilet, 19...Player body, 20
... Pressure arm, 21 ... Clamp mechanism section, 23 ... Compact disk, 25 ... Top chassis, 28 ... Shaft, 29 ... Upper plate section, 30
...Lower plate part, 32, 39...Tension spring, 36...
tongue piece, 37... wedge, 43... ball, 45...
... Clamper holder, 46... Clamper.

Claims (1)

[Scope of utility model registration request] A pressure arm whose base portion is pivotally connected to the top chassis of the compact disc player so as to be rotatable in the direction toward the player body and in the direction away from the player body, and which rotates downward as a tray containing a compact disc enters, and the player of the pressure arm. It consists of a clamper holder provided at a position facing the main body, a clamper loosely fitted into the clamper holder, and a ball press-fitted into the pressure arm side of the clamper holder. The ball, the clamper holder, and the clamper are arranged concentrically, and the ball, the clamper holder, and the clamper are arranged concentrically. A disk clamp mechanism for a compact disk player characterized by pressing.