JPH0555342U - Disk-shaped clamp device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a disc-shaped body clamping device capable of reliably pinching and fixing to a turntable without causing unevenness in rotation of the disc-shaped body. [Structure] The clamp device 27 is a compact disc 2
5 and a cylindrical portion 29 having one end fixed to the clamping portion 28 and formed in a tapered shape.
And a flange 30 formed at the other end of the clamper 3
1 and a support frame 34 for supporting the clamper 31 formed inside the opening / closing door 23.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a disc-shaped clamp device for pinching and fixing a disc-shaped body such as a compact disc (CD) to a turntable.

[0002]

[Prior Art]

 Conventionally, in a radio cassette recorder or the like having a compact disc (CD) playback function, an opening / closing door that can be freely opened and closed is provided in the CD playback portion, and the CD is clamped / fixed to the turntable inside the door. A clamping device is provided for this purpose. FIG. 3 and FIG. 4 are cross-sectional views showing the structure of the conventional clamp device 1 at the time of playing a CD and opening the opening / closing door 9, respectively.

The clamp device 1 includes a clamping unit 4 for clamping the compact disc 2 on the turntable 3, a cylindrical unit 5 having one end fixed to the clamping unit 4, and a flange formed on the other end of the cylindrical unit 5. And a clamper 7 composed of The clamper 7 has a built-in permanent magnet 8 therein in order to prevent slippage between the compact disc 2 and the turntable 3 which rotate at high speed during CD reproduction, and the permanent magnet 8 is made of a magnetic material. Magnetically attracted to the turntable 3, the compact disc 2 is clamped and fixed to the turntable 3.

By operating a reproduction start button or the like (not shown), the turntable 3 starts rotating about a rotary shaft 3a directly connected to a drive motor (not shown). The opening / closing door 9 is rotatably fixed to a housing (not shown), and is swingably displaced about a hinge (not shown) by a pressing operation from the outside, for example, by a finger of an operator. A support frame 10 for supporting the clamper 7 is formed inside the opening / closing door 9. The tip portion 10a of the support frame 10 is formed to have an inner diameter larger than the outer diameter of the cylindrical portion 5 of the clamper 7 and smaller than the outer diameter of the flange 6 of the clamper 7, and depending on whether the opening / closing door 9 is opened or closed. 7 is supported by the turntable 3 so that it can be displaced toward and away from the turntable 3 by loosely inserting a through hole 11 formed between the turntable 3 and the tip portion 10a.

During CD reproduction, the clamper 7 also rotates at high speed while the compact disc 2 is clamped and fixed. Therefore, the play hole 11 described above allows a gap W1 to be formed between the clamper 7 and the tip portion 10a of the support frame 10 at the time of playing a CD, and prevents the clamper 7 from rotating against an impact from the outside. Sound is prevented from skipping by not causing interference. Further, during CD reproduction, the rotation center of the turntable 3 and the rotation center of the clamper 7 must be the same. Therefore, a concave portion 4a having inclined surfaces 4b and 4c that fits into a protrusion 3b formed by protruding the tip of the rotary shaft 3a from the surface of the turntable 3 is formed on the bottom of the clamper 7, and the opening / closing door 9 is closed. At this time, the clamper 7 is guided by the protrusion 3b of the rotary shaft 3a being fitted into the inclined surfaces 4b and 4c, and the rotation center 4d of the recess 4a and the rotation center 3c of the turntable 3 are likely to coincide with each other. I am trying.

Further, when the opening / closing door 9 is opened, the support frame 10 and the flange 6 are engaged with each other by the weight of the clamper 7 as shown in FIG. Are taken out and loaded.

[0007]

[Problems to be solved by the device]

 In the above-described clamping device 1, when the opening / closing door 9 is opened, the clamper 7 slides by its own weight in the arrow A direction, that is, in the hinge direction (not shown) which is the center of rotation of the opening / closing door 9, as shown in FIG. .. This is due to the gap W1 described above, and the movement amount of the clamper 7 at this time corresponds to the gap W1. Therefore, as shown in FIG. 4, the distance between the tangent t2 of the arc r1 of the door 9 passing through the center 3c of the turntable and the center t1 of the center 4d of the recess 4a of the clamper 7 is also W1. Therefore, if such a shift occurs when the opening / closing door 9 is opened, the rotation center 4d of the clamper 7 is eccentric from the rotation center 3c of the turntable 3 even when the opening / closing door 9 is closed. There is a problem in that the compact disc 2 may be unevenly rotated during CD reproduction due to riding on the protrusion 3b of the turntable 3 or may not be sufficiently fixed.

Further, conventionally, the protrusion 3b of the turntable 3 is formed to be as large as possible so that the above-mentioned displacement does not occur even when the opening / closing door 9 is closed, and the clamper 7 and the turntable 3 are formed. The rotation centers 4d and 3c of the above are easily aligned with each other. However, if the protrusion 3b of the turntable 3 is formed to be large, the weight of the turntable 3 is increased, and the turntable 3 is directly connected to the rotary shaft 3a, which imposes a large load on a motor (not shown) for rotationally driving the turntable 3. There is a problem that it will become.

Therefore, an object of the present invention is to provide a disk-shaped clamp device that can reliably perform clamping and fixing to a turntable without causing unevenness in rotation of the disk-shaped body. is there.

[0010]

[Means for Solving the Problems]

 The present invention provides a clamper including a pressing portion that presses a disk-shaped body on a turntable, a cylindrical portion having one end fixed to the pressing portion, and a flange formed at the other end of the cylindrical portion. , Having a larger diameter than the outer diameter of the cylindrical portion and smaller than the outer diameter of the flange, and having a through hole into which the cylindrical portion is loosely inserted, so that the clamper can rotate and can be displaced toward and away from the turntable. In a disk-shaped clamp device including a support member for supporting, the disk-shaped clamp device is characterized in that the cylindrical portion is formed in a tapered shape.

[0011]

[Action]

 According to the present invention, for example, a clamper having a pressing portion for pressing and fixing a disc-shaped body such as a compact disc on a turntable includes a cylindrical portion having one end fixed to the pressing portion and the cylindrical portion. And a flange formed at the other end of the section. Further, a supporting member for supporting the clamper is formed to have a diameter larger than an outer diameter of the cylindrical portion and smaller than a flange so that the clamper can rotate and can be displaced toward and away from the turntable. Is provided with a through hole for loose insertion. The cylindrical portion into which the through hole is loosely inserted is formed in a tapered shape, and the clamp device is configured to include such a clamper and a supporting member.

With this, when the clamper is separated from the turntable, the clamper is fitted into the play hole by its own weight, and the distance between the outer peripheral surface of the cylindrical portion and the inner peripheral surface of the play hole is narrowed. Therefore, when clamping and fixing a compact disc in a CD radio cassette recorder or the like by using such a clamp device, for example, it is possible to eliminate the occurrence of the deviation between the rotation center of the turntable and the rotation center of the clamper. it can. Further, when the clamper is close to the turntable, the clamper is pushed up by the turntable and floats up from the through hole, which widens the space between the outer peripheral surface of the cylindrical portion and the inner peripheral surface of the free hole. Therefore, for example, in the above-mentioned CD radio cassette recorder or the like, the rotation of the clamper is not obstructed during the reproduction of the compact disc.

[0013]

【Example】

 FIG. 1 is a sectional view showing the internal structure when the opening / closing door 23 of a CD reproducing device 21 according to an embodiment of the present invention is opened, and FIG. 2 is a sectional view showing the internal structure when reproducing a CD. Is. The CD player 21 includes, for example, a resin housing 22 and an opening / closing door 23, and a CD reproducing unit including a pickup 40 and the like is formed. One end of the opening / closing door 23 is rotatable by a hinge 24. It is fixed to the housing 22. The opening / closing door 23 is swingably displaced about the hinge 24 by a pressing operation from the outside, for example, by an operator's finger or the like. A clamp device 27 is provided inside the opening / closing door 23 to clamp and fix the compact disc 25 to the turntable 26.

The clamp device 27 clamps the compact disc 25 on the turntable 3, a clamping portion 28, a cylindrical portion 29 having one end fixed to the clamping portion 28 and formed in a tapered shape, and a cylindrical portion 29. It is configured to include a clamper 31 formed by a flange 30 formed at the end. The clamper 31 has a built-in permanent magnet 32 therein in order to prevent slippage between the compact disk 25 and the turntable 26, which rotate at high speed during CD reproduction, and the permanent magnet 32 is made of a magnetic material. The compact disc 25 is pinched and fixed to the turntable 26 by magnetically attracting it to the turntable 26.

By operating a reproduction start button or the like (not shown), the turntable 26 starts rotating around a rotary shaft 26a directly connected to the drive motor 33. A support frame 34 for supporting the clamper 31 is formed inside the opening / closing door 23. The tip portion 34a of the support frame 34 is formed with an inner diameter larger than the outer diameter of the cylindrical portion 29 of the clamper 31 and smaller than the outer diameter of the flange 30 of the clamper 31. The clamper 31 is supported by the turntable 26 such that the clamper 31 can be displaced toward and away from the turntable 26 by loosely inserting a through hole 35 formed between the clamper 31 and the tip portion 34a.

During CD reproduction, as shown in FIG. 2, the clamper 31 also rotates at high speed while the compact disc 25 is clamped and fixed. For this reason, the above-mentioned play hole 35 allows a relatively large gap W2 to be formed between the clamper 31 and the front end portion 34a of the support frame 34 during CD reproduction, thereby preventing rotation of the clamper 31. I try not to wake it up. Further, during CD reproduction, the rotation center of the turntable 26 and the rotation center of the clamper 31 need to be the same. Therefore, a concave portion 28a having inclined surfaces 28b and 28c that fits into a protruding portion 26b formed by protruding the tip of the rotary shaft 26a from the surface of the turntable 26 is formed in the bottom portion of the clamper 31, and the opening / closing door 23 is closed. At this time, the clamper 31 is guided by the protrusion 26b of the rotary shaft 26a being fitted into the inclined surfaces 28b and 28c so that the rotation center 28d of the recess 28a and the rotation center 26c of the turntable 26 are aligned with each other. ing. Further, when the opening / closing door 23 is opened, the front end portion 34 a of the support frame 34 and the flange 30 are engaged with each other due to the weight of the clamper 31. In the present embodiment, for example, when the cylindrical portion 29 of the clamper 31 is formed in a tapered shape, the outer diameter of the cylindrical portion 29 and the outer diameter of the support frame 34 at the time of engagement described above are made substantially the same. Even when the opening / closing door 23 is opened, the center 28d of the clamper 31 is the locus of rotation of the opening / closing door 23 with the hinge 24 as the center of rotation, and is always positioned on the arc r2 passing through the center 26c of the turntable 26. be able to.

As described above, by using the clamper 31 having the tapered cylindrical portion 29, the compact disc 25 of the compact disc 25 is provided between the clamper 31 and the support frame 34 when the opening / closing door 23 is closed. A sufficient gap W2 that does not hinder the reproduction can be maintained, and at the same time, when the opening / closing door 23 is open, the rotation center 28d of the clamper 31 can be prevented from being displaced from the rotation center 26c of the turntable 26. ..

The present invention is not limited to the above embodiment, but various modifications can be made. For example, in the above description, the case where the clamp device 27 is provided on the opening / closing door 23 that performs rotational displacement has been described, but the present invention is also applicable to a so-called loading type CD reproducing device and the like.

[0019]

[Effect of the device]

 As described above, according to the present invention, the clamper having the clamping portion for clamping the disc-shaped body on the turntable is formed at the cylindrical portion whose one end is fixed to the clamping portion and the other end of the cylindrical portion. And a support member for supporting the clamper, the support member being larger than the outer diameter of the cylindrical portion and being larger than the flange so that the clamper can rotate and can be displaced toward and away from the turntable. Is also formed small. In such a clamp device including the clamper and the supporting member, since the cylindrical portion is formed in a tapered shape, when the clamper is separated from the turntable, the clearance between the through holes is narrow. In addition, the clearance between the through holes becomes wider in the state of being close to the turntable. Thus, for example, in a CD player or the like, when the compact disc is pressed against the turntable by such a clamper, the center of rotation between the clamper and the turntable does not occur, and the CD is played back. At times, the rotation of the clamper will not be disturbed. Therefore, the centering of the clamper on the turntable can be easily performed, so that the disc-shaped body can be firmly pressed against the turntable.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an internal configuration of a CD player 21 according to an embodiment of the present invention when an opening / closing door 29 is opened.

FIG. 2 is a cross-sectional view showing an internal configuration of a CD reproducing device 21 during CD reproduction.

FIG. 3 is a cross-sectional view showing the structure of a conventional compact disc clamping device 1 during CD reproduction.

FIG. 4 is a cross-sectional view showing the structure of a conventional compact disc clamping device 1 when an opening / closing door is opened.

[Explanation of symbols]

 25 Compact Disc 26 Turntable 27 Clamping Device 28 Clamping Part 29 Cylindrical Part 30 Flange 31 Clamper 34 Support Frame 35 Free Hole

Claims (1)

[Scope of utility model registration request] 1. A clamper comprising a pressing portion for pressing the disc-shaped body on a turntable, a cylindrical portion having one end fixed to the pressing portion, and a flange formed at the other end of the cylindrical portion. It is formed to be larger than the outer diameter of the cylindrical portion and smaller than the outer diameter of the flange, has a through hole into which the cylindrical portion is loosely inserted, and supports the clamper rotatably and capable of being displaced toward and away from the turntable. A disc-shaped clamping device including a supporting member for forming the disc-shaped clamping device, wherein the cylindrical portion is formed in a tapered shape.