JPH0329814Y2 - - Google Patents

Description

[Detailed description of the invention] "Technical field" This invention is a compact disc mounted on the turntable of a compact disc player.
This invention relates to a disk clamping mechanism for reliably clamping the turntable horizontally and with appropriate pressure without applying lateral pressure.

"Prior Art and its Problems" Conventionally, as shown in FIG. 8, the method of clamping a compact disk is to arrange a ball 2 on the axis of a clamper 1, and to use a shaft 3 as a fulcrum for this ball 2. It has been proposed to clamp the compact disc 6 on the turntable 5 by pressing it with a presser plate 4. However, when using this clamping method, the horizontal state of the presser plate 4 during clamping becomes unstable due to the fulcrum position of the presser plate 4, and as a result, when the presser plate 4 is tilted, as shown in FIG. At the same time, component forces S1 and W1 act on the presser force F1 on the presser plate 4 side, and at the same time, W2=W1 and S2= on the clamper 1 side.
The component force S1 acts, and this component force S2 applies a lateral force to the motor shaft, which applies lateral pressure to the motor bearing, causing wear on the motor bearing and uneven rotation of the turntable. ing. At the same time, the component force S1 generated on the presser plate 4 also applies lateral pressure to the presser plate 4 side, which increases the burden on the presser plate 4 side.

``Purpose of the invention'' This invention applies the pressing force to the compact disk by the presser plate perpendicularly to the surface of the compact disk, so that no component force is generated on the clamper side and only on the presser plate side. A disk clamping mechanism for a compact disk player that is capable of stabilizing motor rotation by removing side pressure on the motor bearing, and maintaining the clamper's pressing force at an appropriate level regardless of variations in the tray's pushing stroke. The purpose is to provide

"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 which is movably pivoted and rotates downward when a tray containing a compact disc is entered; The presser arm includes a presser plate that moves up and down in a straight line on the top, and a clamp mechanism that is disposed on the presser plate at a position facing the player main body, and the pressure arm is attached to the base to accommodate the tray's entry stroke. an absorption mechanism that absorbs variations and adjusts the pressure applied to the compact disk by the clamp mechanism to an appropriate pressure; the clamp mechanism includes:
The clamper includes a clamper holder provided on the presser plate part, a ball press-fitted into the clamper holder on the side of the presser plate part, and a clamper loosely fitted in the clamper holder and pressed by the ball, A clamper holder, a ball, and a clamper are arranged concentrically.

``Embodiments of the invention'' Preferred embodiments of the invention will be described below with reference to the drawings.

FIG. 7 shows the overall appearance of a compact disc player to which the present invention is applied.
A power switch 12, a music selection storage display section 13, an eject button 14, a switch group 15, and the like are arranged on the front surface of the compact disc player 11. The left half of the entire compact disc player 11 is a mechanism section 16.
is built in as a unit. 17 is a tray that accommodates the compact disk 24;
It is designed to be able to move forward and backward within 6. Also 18
is an insertion section for inserting the tray 17 into the mechanism section 16, and is slightly protruded from the front surface of the compact disc player 11 as a whole.

As shown in FIGS. 1 and 2, the mechanism section 16 includes a player main body 19, a pressure arm 20, and a clamp mechanism section 21 rotatably connected to the pressure arm 20.
It is located inside. A turntable 23 with a vertical axis projects from the center of the player body 19, and is used to mount a compact disc 24. Positioning pin 2 is placed on the turntable 23.
5 protrudes coaxially, and this positioning pin 2
5 is inserted into the central circular hole of the compact disk 24 mounted on the turntable 23, and coaxially locks the compact disk 24 to the positioning pin 25, so that the compact disk 24 is rotated concentrically without eccentricity. It's getting old. A motor (not shown) for rotating the turntable 23 is built into the player main body 19.

The pressure arm 20 is connected to the top chassis 26.
The player body 19 is pivotally connected to a shaft 29 via a pair of bent pieces 28 at the end sides of a punched portion 27 formed in the center thereof so as to be rotatable in the side direction of the player body 19 and in the direction away from the player body 19. The pressure arm 20 has an upper plate part 30 and a lower plate part 31 connected to the shaft 2.
9, and this upper plate part 3
A tension spring 33 is interposed between the upper plate part 31 and the lower plate part 31 through the window hole 32 of the upper plate part 31. This tension spring 33 has the function of holding the upper plate part 30 and the lower plate part 31 together, absorbing variations in the advancing stroke of the tray 17, and relieving overclamping by the clamp mechanism part 21. There is.
A stopper 34 is formed at the end of the lower plate part 31 opposite to the shaft 29 by being bent upward, and comes into contact with the lower surface of the upper plate part 30 to maintain its integrity with the upper plate part 30. . Further, an arm portion 35 protrudes from the side end portion of the lower plate portion 31, 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 a protrusion 38 of the tongue 36, causing the tongue 36 to move upward. This is for pushing the pressure arm 20 toward the side of the player body 19 via the shaft 29. The rear end portion of the upper plate portion 30 is bent vertically downward and serves as an abutting portion 40 of an adjustment mechanism portion 39 that adjusts the swing width of the pressure arm 20. In this embodiment, the adjustment mechanism section 40 has a structure in which an adjustment screw 42 is screwed into a support piece 41 formed by bending the top chassis 26.

The direction of the pressure arm 20 away from the player body 19 side centered on the shaft 29, that is,
A tension spring 43 is interposed in the pressure arm 20 to assist the rotation in the non-clamping direction. This spring 43 is attached to the side notch 44 of the upper plate portion 30.
The pressure arm 20
is biased in the non-clamping direction.

At the end of the pressure arm 20 opposite to the shaft 29, a presser plate section 46 of the clamp mechanism section 21 is rotatably connected via a shaft 48 by a connecting section 47. Further, a tension spring 49 is also interposed between the pressure arm 20 and the presser plate portion 46. This spring 49 passes through the window hole 50 of the upper plate part 30,
One end is locked to the upper plate part 30 side and the other end is locked to a locking part 51 provided protruding from the presser plate part 46, and urges the clamp mechanism part 21 and the upper plate part 30 to be in a straight line state. ing. Therefore, pressure arm 20
rotates around the shaft 29, the clamp mechanism 2
1 moves in a straight line with respect to the compact disk 24 mounted on the turntable 23 in response to the rotation of the pressure arm 20.

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 cylindrical clamper holder 52 with an open end is provided at a position facing the player main body 19 on the lower surface of the presser plate portion 46 . A flange 53 is formed inside the opening of the clamper holder 52. A ball 55 is press-fitted into the lower surface of the presser plate portion 46 in the clamper holder 52 via a seat 54 so as to face the axis of the positioning pin 25 . Further, a clamper 56 is loosely fitted into the clamper holder 52. A flange 57 is formed on the outer periphery of the clamper 56, and the flange 57 and the flange 53 of the clamper holder 52 prevent the clamper 56 from detaching from the inside of the clamper holder 52. The lower surface of the clamper 56 serves as a clamping surface 58 for pressing the compact disk 24, and in the center of the lower surface of the clamper 56, a plate slightly larger than the outer diameter of the positioning pin 25 is provided in order to avoid contact with the positioning pin 25. A recess 59 is formed. Further, a small-diameter recess 60 for receiving the ball 55 is formed on the back surface of the recess 59, that is, the surface facing the ball 55 press-fitted into the holding plate portion 46. When the clamp mechanism 21 presses the compact disk 24, the ball 55, clamper holder 52, and clamper 56 are arranged concentrically. The thickness of the clamper holder 52 is such that when the compact disk 24 is clamped, the thickness of the flange 5 of the clamper holder 52 is
A gap (usually 2 mm or more) is created so that the lower surface of the compact disk 3 does not come into contact with the upper surface of the compact disk 24.

The action will be explained below.

Tray 17 loaded with compact disk 24
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 tongue piece 36 extending from the lower plate section 31 of the pressure arm 20. It comes into contact with the protrusion 38 . When the tray 17 is further fed, the wedge 37 presses the protrusion 38 and pushes the tongue piece 36 upward. When the tongue piece 36 is pushed up, the upper plate portion 30 is pulled by the action of the spring 33, and the pressure arm 20 begins to rotate around the shaft 29 toward the player body 19 side. As the pressure arm 20 rotates, the spring 43 also stretches against its tensile force, and in response to the rotation of the pressure arm 20, the presser plate 46 maintains its linear state with the help of the spring 49 and pivots around the shaft 48 as a fulcrum. Then, it descends toward the player main body 19 side. When the wedge 37 continues to be pushed up toward the tongue piece 36 as the tray 17 enters, the clamper 56 of the clamp mechanism section 21
The positioning pin 25 is inserted into the recess 59, and the clamping surface 58 also comes into contact with the upper surface of the compact disk 24. In this state, when the presser plate 46 is further pressed toward the compact disk 24 by the pressure arm 20, the ball 55 press-fitted into the presser plate 46 comes into contact with the upper recess 60 of the clamper 56. At this time, the ball 55 and the clamper 56 are located coaxially with the positioning pin 25. Thereafter, the clamp mechanism section 21 is pressed onto the player main body 19 by the pressure arm 20, and accordingly, the ball 55 hits the clamper 56.
presses the compact disc 24 in a continuous manner. At this time, as shown in FIG. 6, the presser force F1 is applied to the presser plate portion 46 side and the clamper 56 side.
= Only F2 acts, no component force is generated. Then, by pressing the ball 55 against the clamper 56,
The compact disk 24 is horizontally clamped onto the turntable 23 by the pressing force of the clamper 56 with equal pressure. At this time, the contact portion 40, which had already rotated together with the rotation of the pressure arm 20, comes into contact with the adjustment screw 42, and the movement of the pressure arm 20 is stopped. Therefore, the wedge 37 of the tray 17 is also connected to the tongue piece 36.
Even if the pressure arm 20 is pushed up, only the lower plate portion 31 that constitutes the pressure arm 20 rotates slightly around the shaft 29.
It simply expands against the tensile force of the spring 33.
This expansion of the lower plate portion 31 absorbs variations in the advancing stroke of the tray 17 and alleviates overclamping by the clamper 56. Therefore, the clamper 56 is in a state where it clamps the compact disk 24 at an appropriate pressure.

Next, release of the clamp on the compact disc 24 will be explained.

When the tray 17 is moved backward, the expanded lower plate part 31 is first closed by the tensile force of the spring 33, and the stopper 34 comes into contact with the lower surface of the upper plate part 30. Then, when the tension force of the spring 43 acts and the pressure arm 20 rotates upward around the shaft 29, the presser plate portion 46 is raised by the spring 49 while maintaining a linear state with the pressure arm 20. As the presser plate section 46 moves upward, the pressure on the clamper 56 by the ball 55 is released, and the clamping state of the compact disk 24 by the clamper 56 is released. As the upward movement of the presser plate portion 46 continues, the clamper 56 separates from the ball 55 and is loosely fitted into the clamper holder 52. At the same time, the pressure arm 20 rotates while being pulled up about the shaft 29, and in response to the rotation of the pressure arm 20, the presser plate portion 46 returns to its original position in a further straight line.

"Effect of the invention" As explained above, the disc clamp mechanism of the compact disc player of the invention connects the presser arm and the presser plate part in a rotatable manner, and then connects the presser plate part to the compact disc side in a straight line with the presser arm. At the same time, a ball for pressing the clamper is press-fitted into the holding plate side, and this ball presses the clamper and clamps the compact disk, so the compact disk can be moved by the holding plate. A pressing force can be applied perpendicularly to the surface of the compact disc. Therefore, only the holding force is generated on the holding plate side and the clamper side, so that the lateral pressure on the motor bearing can be removed and stable motor rotation can be obtained. 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]

Figure 1 is a front view of the disk clamp mechanism according to the present invention, Figure 2 is a plan view of Figure 1, Figure 3 is an exploded perspective view of the mechanism according to the present invention, and Figure 4 is an enlarged view of the mechanism according to the present invention. 5 is a front view, FIG. 5 is a sectional view of the clamping mechanism of the mechanism of the present invention, FIG. 6 is an action diagram showing the relationship between the pressing force and component force of the clamping mechanism of FIG. 5, and FIG. 7 is an overall schematic perspective view of a compact disc player incorporating the mechanism of the present invention;
8 and 9 are schematic cross-sectional views showing a conventional disk clamping method. 17...Tray, 19...Player body, 20
. . . Pressure arm, 21 . . . Clamp mechanism section, 24 . Tension spring, 36...tongue, 37...wedge, 39...
Adjustment mechanism part, 40... Contact part, 46... Presser plate part, 52... Clamper holder, 55... Ball,
56... Clampa.

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 an end portion of the pressure arm. a presser plate portion that is rotatably connected to the presser arm and moves up and down in a straight line on the player body in response to the rotation of the pressure arm, and the presser plate portion is disposed at a position facing the player body. the pressure arm has an absorption mechanism at the base that absorbs variations in the tray's advancing stroke and adjusts the pressure applied to the compact disk by the clamp mechanism to an appropriate pressure; The clamp mechanism includes a clamper holder provided on the presser plate, a ball press-fitted into the clamper holder on the presser plate side, and a clamper loosely fitted in the clamper holder and pressed by the ball. A disk clamping mechanism for a compact disk player, characterized in that the clamper holder, the ball, and the clamper are arranged concentrically.