JPH04298853A - Supporting structure of collet in recording and reproducing device - Google Patents

Abstract

PURPOSE:To offer the supporting structure of a collet in a recording and reproducing device using a slide bearing capable of preventing sound at the time of the rotation of a disk to generate often in a ball bearing from generating, having a small friction coefficient and capable of suppressing the value of the current consumption of a motor. CONSTITUTION:This device is provided with the slide bearing 9 fitted and fixed to the inside circumferential part of the collet 7 and coupling the collet 7 rotatably and movably in the direction of the shaft with a shaft member 5. On the slide bearing 9, a spring receiver 11 is provided, a coil spring 19 coming into contact elastically with the spring receiver 11 to energize the slide bearing 9 and the collet 7 to the disk side is provided. Further, the slide bearing 9 and the spring receiver 11 are formed by synthetic resin material sliding smoothly each other.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a support structure for a collet in a recording/reproducing apparatus.

0002

[Prior Art] In a recording/reproducing device, a disc (5.25
After inserting an inch FD into a disk storage section, the disk is rotated by a motor, the head is brought into contact with the disk, and the head is moved in the radial direction of the disk to perform recording or reproducing operations. In such a recording/playback device,
In order for the head to stably perform recording or reproducing operations, the disk must follow the rotation of the motor and rotate stably. Therefore, during recording or playback operation, a collet separate from the spindle side is inserted into the center hole of the disk, and the periphery of the center hole of the disk is held between the spindle side of the motor and the collet, causing the disk to follow the motor. I try to rotate it by letting it rotate.

On the other hand, since the collet is inserted into the center hole of the disk during recording or reproducing operations, it is necessary to keep it separated from the disk when loading or unloading the disk. Therefore, a shaft member is provided that can move toward and away from the spindle, and the collet is rotatably disposed on this shaft member. Conventionally, the collet is supported with respect to the shaft member through a rolling bearing.

0004

[Problems to be Solved by the Invention] However, although the collet support structure using rolling bearings is excellent in terms of friction coefficient, if dust gets inside the rolling bearings, noise will be generated when the disk rotates, and the collet will remain unused for a long period of time. If used, there is a risk of damaging the rolling bearing. Therefore, an attempt was made to support the collet with a sliding bearing made of resin with good sliding properties and a spring bearing made of metal. If the collet is slidably supported by the collet, the friction coefficient is large, the load for rotating the disk becomes large, and the current consumption value of the motor becomes high. The present invention has been devised in view of the above-mentioned circumstances, and an object of the present invention is to prevent the generation of noise during disk rotation, which tends to occur in conventional rolling bearings, and to reduce the current consumption value of the motor. It is an object of the present invention to provide a support structure for a collet in a recording/reproducing device using a sliding bearing that can be kept low.

[0005]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a shaft member disposed movably in a direction toward and away from a spindle for driving a disk, and a shaft member disposed on the shaft member. , a collet support structure in a recording/reproducing device comprising a collet that cooperates with the spindle to clamp a disk while the shaft member is close to the spindle, the collet being fixed to the inner circumference of the collet; A slide bearing is provided rotatably and axially movably coupled to the shaft member, a stopper is provided at the end facing the spindle side of the shaft member to restrict the axial movement of the collet toward the spindle side, and a stopper is provided at the end of the shaft member facing the spindle side, and A spring receiver is disposed on a surface of the half body that is different from the stopper side, and a coil spring that comes into elastic contact with the spring receiver and biases the slide bearing and the collet toward the stopper side is provided, and further, the slide bearing and the spring receiver are It is characterized by being made of a synthetic resin material that has good sliding properties against each other. Further, the present invention is characterized in that the sliding bearing is formed integrally with the collet. Further, the present invention is characterized in that a washer made of a highly rigid material is disposed in a spring receiving portion with which the coil spring comes into elastic contact. Further, the present invention is characterized in that one of the slide bearing and the spring receiver is formed of an oil-impregnated acetal resin, and the other is formed of a high molecular weight polyethylene resin. Furthermore, the present invention is characterized in that one of the sliding bearing and the spring receiver is formed of oil-impregnated acetal resin, and the other is formed of polyamide resin.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows a cross-sectional front view of the collet support structure according to the present invention, in which the left half is shown away from the disk, and the right half is sandwiched between the spindle side of the motor and the periphery of the center hole of the disk. Indicates the condition. Reference numeral 1 denotes a support piece connected to the case side of the recording/reproducing device. A shaft 3 is suspended from the support piece 1. A sleeve 5 is disposed on the shaft 3 so as to be movable in the axial direction. 5 via a sliding bearing 9 so as to be rotatable and movable in the axial direction. In this embodiment, the sleeve 5 corresponds to the shaft member.

The collet 7 has an inner peripheral part and an outer peripheral part, and the inner peripheral part has a sleeve insertion hole 701 and a sleeve insertion hole 70.
An annular upward facing bottom surface 703 centered on 1, and a bottom surface 70
Recessed portion 7 consisting of an inner peripheral surface 705 rising from the outer periphery of 3
07 is formed. Furthermore, a tapered guide surface 709 for inserting into the center hole of the disk and a pressing surface 711 for pressing the periphery of the center hole of the disk are formed on the outer peripheral portion.

The sliding bearing 9 is shown in plan view in FIG. 2 and in FIG.
As shown in the sectional view taken along the line AA in FIG. 2, it has an annular shape, and a recess 903 for storing grease is formed in the upper surface 901. The sliding bearing 9 is housed in the recess 707 with its lower surface 905 placed on the bottom surface 703 of the collet 7, and its outer circumferential surface 907 fitted and fixed to the inner circumferential surface 705. In this embodiment, the collet 7 and the sliding bearing 9 are formed separately, but the collet 7 and the sliding bearing 9 may be formed integrally from the same material. On the upper surface 901 of the slide bearing 9, an annular spring receiver 11 as shown in a plan view in FIG. 4 and in a sectional front view in FIG.
01 is provided with a washer 13.

The inner peripheral surface 1103 of the spring receiver 11 is fitted into the sleeve 5, and when the collet 7 rotates, the upper surface 901 of the sliding bearing 9 is connected to the lower surface 1105 of the spring receiver 11.
slide against. An upper spring receiver 17 is disposed at the upper end of the sleeve 5 via a stop ring 15. Between the upper spring receiver 17 and the washer 13 is a coil spring 1 whose diameter gradually decreases toward the lower end.
A coil spring 19 urges the collet 7 toward the lower end of the sleeve 5 and abuts against a stopper 501 of the sleeve 5 (see the left half of FIG. 1). During a recording or reproducing operation, an arm (not shown) moves the sleeve 5 downward, and the periphery of the center hole of the disk is held between the holding surface 711 of the collet 7 and the spindle side of the motor, and at this time, as shown in FIG. As shown in the right half, the coil spring 19 is compressed. Further, when the disk is inserted or removed, an arm (not shown) moves the sleeve 5 upward, and the collet 7 is separated from the disk.

In the above structure, the sliding bearing 9 is made of oil-impregnated acetal resin. In this example,
It is formed by adding ultra-high molecular weight polyethylene and oil to polyacetal to give it sliding properties, and furthermore, it is used by storing grease in the recess 903. Further, the spring receiver 11 is made of a material that has good sliding properties against oil-impregnated acetal resin. In this example, high molecular weight polyethylene was used. Furthermore, since the load of the coil spring 19 acts on the spring receiver 11, the washer 13 is
This is provided to prevent the spring receiver 11 from buckling, and is made of highly rigid metal, reinforced plastic, or the like.

[0011] With the collet support structure constructed in this way, under a load of 2 kgf and a rotation speed of 360 rpm, 1
The test results after rotation for 00 hours are shown in FIG. In FIG. 6, a polygonal line A indicates the test results of this example. In addition, the polygonal line B represents the test results when the structure was similar to that of this example but no grease was used, and the polygonal line C represents the test results when the spring receiver 11 was formed of polyamide and no grease was used.
Line D shows the test results when the spring receiver 11 is made of polytetrafluoroethylene and no grease is used, and line E shows the test results when the spring receiver 11 is made of stainless steel and no grease is used. show. As is clear from FIG. 6, the sliding bearing 9 is made of oil-impregnated acetal,
When the spring receiver 11 is made of stainless steel, the coefficient of friction is as large as 0.2 or more, and the current consumption value is high.
When the sliding bearing 9 is made of oil-impregnated acetal and the spring receiver 11 is made of high molecular weight polyethylene, polyamide, or polytetrafluoroethylene, the coefficient of friction is 0.1.
A stable and quiet collet support structure that does not generate noise was obtained. In particular, when grease was used for the high molecular weight polyethylene resin, a collet support structure was obtained in which the friction coefficient was always stable at 0.05 or less and the current consumption value was low.

0012

[Effects of the Invention] As is clear from the above explanation, according to the present invention, since the sliding bearing and the spring receiver are made of a synthetic resin material with good sliding properties to support the collet,
A support structure for a collet in a recording/reproducing device that uses a sliding bearing that can prevent the noise generated when the disk rotates, which is often caused by conventional rolling bearings, and also has a small coefficient of friction and can keep the current consumption of the motor low. is obtained.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a collet support structure.

FIG. 2 is a plan view of a sliding bearing.

FIG. 3 is a sectional view taken along line AA in FIG. 2;

FIG. 4 is a plan view of the spring receiver.

FIG. 5 is a cross-sectional front view of the spring receiver.

FIG. 6 is a diagram showing test results of the collet support structure.

[Explanation of symbols] 5 Sleeve (shaft member) 7 Colette 9 Sliding bearing 11 Spring receiver 13 Washer 19 Coil spring

Claims (5)

[Claims] 1. A shaft member disposed to be movable in a direction toward and away from a spindle for driving a disk; A collet support structure for a recording/reproducing device including a collet that cooperates to sandwich a disk, and a sliding bearing that is fixed to the inner circumference of the collet and rotatably and axially movably connects the collet to a shaft member. is provided at the end of the shaft member facing the spindle side,
A stopper is provided to restrict the axial movement of the collet toward the spindle, and a spring receiver is provided on a half-side surface of the slide bearing that is different from the stopper side, and the slide bearing and the collet are brought into elastic contact with the spring receiver. A support structure for a collet in a recording/reproducing device, characterized in that a coil spring is provided to urge the stopper side, and the sliding bearing and the spring receiver are made of a synthetic resin material that has good sliding properties with respect to each other. 2. A collet support structure in a recording/reproducing apparatus according to claim 1, wherein the sliding bearing is formed integrally with the collet. 3. A collet support structure in a recording/reproducing apparatus according to claim 1, wherein a washer made of a highly rigid material is provided in a spring receiving portion with which the coil spring comes into elastic contact. 4. A collet support structure in a recording/reproducing apparatus according to claim 1, wherein one of the sliding bearing and the spring receiver is formed of oil-impregnated acetal resin, and the other is formed of high molecular weight polyethylene resin. 5. A collet support structure in a recording/reproducing apparatus according to claim 1, wherein one of the sliding bearing and the spring receiver is made of oil-impregnated acetal resin, and the other is made of polyamide resin.