JPH05114236A - Device for adding motor side pressure to disk playback device - Google Patents

Abstract

(57) [Summary] [Object] The present invention relates to a motor side pressure applying device for a disk reproducing device, which suppresses a motor load by applying side pressure as much as possible and is capable of automatic assembly. It is intended to be realized. [Structure] A guide portion 12c formed on the ring member 12 by inserting the ring member 12 into the output shaft 8a of the motor 8.
The engaging portion 12a transmits the biasing force of the elastic member 11 inserted into the base 9 to the output shaft 8 as a lateral pressure, and the elastic member 11 positions the ring member 12. [Effects] With the above-described configuration of the present invention, it is possible to eliminate the occurrence of shaft play and shaft runout of the motor to which the turntable of the disk reproducing device is fixed, and to apply lateral pressure so that the motor is not overloaded and to perform automatic assembly. It is possible to implement an inexpensive motor side pressure loading device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a side pressure adding device for a motor used in a disc reproducing device such as a compact disc or a video disc.

[0002]

2. Description of the Related Art In a motor for a disc reproducing apparatus, a motor for mounting a disc on a turntable and rotating it is
In order to improve the reproduction performance of the disc, it is necessary to suppress the occurrence of backlash and shake of the output shaft of the motor as much as possible. Also,
When the motor is operated for a long period of time, the clearance between the output shaft of the motor and the metal becomes large, and abnormal noise may be generated from the motor. A method of applying lateral pressure to the output shaft of the motor has been taken from the past for the purpose of preventing the generation of abnormal noise and suppressing backlash and runout of the motor output shaft. A conventional motor side pressure applying device for a disk reproducing device will be described below with reference to the drawings.

FIG. 5 is an exploded perspective view of a conventional example of a motor side pressure applying device used in a disc reproducing device.
FIG. 3 is a partial plan view and a partial cross-sectional side view thereof. The disc reproducing device is provided with an optical pickup for reading information from a compact disc, a video disc, etc., and a traverse mechanism for moving the optical pickup to the inner and outer peripheries of the disc, but these mechanisms are omitted below. , Only the side pressure adding device of the motor will be described.

5 and 6, the motor 2 is a base 1
It is fixed by screws 3 to. Output shaft 2a of motor 2
The ring member 6 is rotatably inserted into the output shaft 2a through the insertion hole 6b. The base 1 is provided with a holding portion 1 a and supports the elastic member 5.
Further, the ring member 6 is provided with a claw 6a, and by engaging the elastic member 5 with the claw 6a, the elastic member 5 is displaced within its elasticity, and the direction of the arrow F in FIG. The biasing force is applied to the motor 2 as a lateral pressure. The ring member 6 is a claw 6
By engaging a with the elastic member 5, the output shaft 2a of the motor 2 is positioned and held. The turntable 4 on which the disk 7 is mounted is press-fitted and fixed to the output shaft 2a of the motor 2, and the urging force generated by the displacement of the elastic member 5 is used as the motor side pressure via the ring member 6 to output the output shaft 2a.
Since it is added to “a”, it is possible to suppress factors that have a detrimental effect on disk reproduction, such as rattling of the output shaft 2a, wobbling, and clearance noise that occur when the motor 2 rotates.

[0005]

One of the problems with the conventional motor side pressure applying device of the above-mentioned disk reproducing device is that automatic assembly and production cannot be performed. Nowadays, not only the production of a disc reproducing apparatus, but in every field, a fully automatic and unmanned production system is adopted for the purpose of stabilizing performance and quality, rationalizing products, solving working environment problems and the like. In the conventional motor side pressure applying device, the assembly of the elastic member and the base and the engagement of the elastic member and the ring member have a configuration and a component shape unsuitable for automatic assembly production. When the elastic member is incorporated into the base, it is not a simple and up-and-down operation, and a method of inserting the elastic member into the holding portion provided on the base from the side direction has been adopted. Also, in engaging the elastic member and the ring member, it is necessary to displace the previously inserted elastic member to the outside of the claw of the ring member and to engage the elastic member with the claw while supporting the ring member. I was there.

Further, in the conventional motor side pressure applying device, the output of the ring member and the ring member which is inserted into the output shaft of the motor and engages with the elastic member incorporated in the base to transmit the biasing force of the elastic member to the motor. The contact portion with the shaft was formed in a simple shape in terms of manufacturing the ring member, so that the entire insertion hole for the output shaft provided in the ring member was in contact with the output shaft. Therefore, there is a problem that the rotational load of the motor increases because the contact area of the motor with the output shaft is large. Further, for example, when the ring member is made of a resin molded product, the outer shape of the ring member may warp or develop due to twist due to variations in molding conditions.
At this time also, there was a problem of increasing the rotational load of the motor. Further, burrs on the die mating surface when the ring member is made of a resin molded product, and burrs in the cutting process when the ring member is made of a cut product also cause an increase in the motor rotation load, It was a problem.

[0007]

In order to solve the above conventional problems, a motor side pressure load device of a disk reproducing apparatus according to the present invention has a base for mounting a motor, an elastic member inserted into the base, and an output shaft of the motor. It is composed of a ring member provided with a guide portion which is inserted rotatably so that the elastic member and the ring member are assembled with respect to the base by a simple operation in one direction, that is, in the axial center direction of the output shaft of the motor. It is characterized in that the elastic member and the ring member are engaged with each other and the positioning and holding of the ring member after the ring member is inserted into the output shaft of the motor can be performed by the simple one-way operation. To do.

Further, the shape of the contact portion of the ring member inserted into the output shaft of the motor with the output shaft of the motor is made smaller than the common hole for inserting the ring member into the output shaft, and the elastic member Due to the biasing force, the ring member tilts, the contact portion between the ring member and the motor shaft increases, and the rotational load of the motor increases due to the deformation of the ring member, the burr, etc. which are considered in the manufacture of the ring member. In order to prevent this, tilting of the ring member with respect to the output shaft of the motor is prevented.

[0009]

According to this structure, by opening the support portion of the elastic member provided on the base in the axial center direction of the motor output shaft, the elastic member is simple in the axial center direction of the motor output shaft. The action allows it to be inserted into the base. The elastic member is held by fastening a screw for fixing the motor to the base so that the elastic member is supported between the screw head and the elastic member holding portion of the base. Furthermore, by providing a tapered guide portion at one end of the ring member inserted in the output shaft of the motor, and by forming it so as to be located closer to the output shaft of the motor than the position of the elastic member incorporated in the base in advance, By inserting the ring member into the output shaft of the motor and moving the ring member in the direction of the central axis of the output shaft of the motor, the elastic member is once displaced to the outer diameter of the ring member by the guide portion of the ring member, and the ring member is further moved. When the member is moved, the elastic member is held by the engaging portion of the elastic member provided on the ring member. The amount of displacement of the elastic member at this time is naturally within elasticity, and when the elastic member is engaged with the ring member, the elastic member is displaced from the initial position incorporated in the base.
A biasing force corresponding to the amount of displacement of the elastic member is applied to the output shaft of the motor, and lateral pressure is applied to the motor.

Further, by making the contact portion between the ring member and the output shaft of the motor smaller than the size of the common hole of the ring member, the contact resistance between the ring member and the output shaft of the motor is reduced as much as possible, and It is possible to prevent the inclination of the ring member by matching the position of the contact portion with the direction in which the biasing force of the elastic member acts or by forming the contact portion on both sides in the direction in which the biasing force acts. Also, the common hole size of the ring member is
By making it larger than the contact part, the deformation of the ring member,
It can be made less susceptible to burrs and the like, and by making the shape of the abutting portion spherical, it is possible to further reduce the contact resistance with the output shaft of the motor.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is an exploded perspective view of an embodiment of the present invention, and FIG. 2 is a partial plan view and a partial sectional side view of an embodiment row. 3 is a partial cross-sectional view showing the assembling procedure of the gist of one embodiment of the motor lateral pressure adding device of the present invention, and FIG.
FIG. 8 is a partial cross-sectional view showing the assembling procedure of the gist of another embodiment of the motor side pressure adding device of the invention. 1 to 4, the motor 8 is attached and fixed to the base 9 with screws 10. The elastic member 11 is inserted into the holding portion 9a provided on the base 9, and is housed and held in the holding portion 9a of the base 9 by the screw head 10a of the screw 10. Output shaft 8 of motor 8
A ring member 12 is slidably and rotatably inserted into a through a common hole 12b. The ring member 12 includes an elastic member 1
An engaging portion 12a for engaging with 1 is provided. Ring member 12
Is inserted into the output shaft 8a of the motor 8 and moved in the direction of the elastic member 11, that is, in the direction of the central axis of the output shaft 8a of the motor 8 (direction of arrow G) (see FIG. 3A), the ring member 12 The tapered guide portion 12c is formed in a shape closer to the output shaft 8a side than the position of the elastic member 11, so that the elastic member 11 is displaced in the direction away from the output shaft 8a as the ring member 12 moves. (Fig. 3
(See (B) to (C)). Further, when the ring member 12 is moved according to the output shaft 8a, the elastic member 11 is displaced to the outer diameter of the ring member 12 (see FIG. 3C). The amount of displacement of the elastic member 11 at this time is equal to or less than the elastic limit of the elastic member 11 itself. When the ring member 12 is further moved, the elastic member 11 slips into the engaging portion 12a provided on the ring member 12 to position and hold the ring member 12 (see FIG. 3D). At this time, the elastic member 1
Since No. 1 is displaced from the position initially stored in the base 9, an urging force is generated based on this displacement amount. That is, the urging force in the direction of arrow E in FIG. 3D is applied to the output shaft 8a of the motor 8 via the ring member 12.

Further, a turntable 13 is fixed to the output shaft 8a, and the disc 1 is mounted on the turntable 13.
4 is mounted, the biasing force of the elastic member 11 is applied as a lateral pressure to the motor 8 when the motor 8 rotates, that is, when the disk 14 is regenerated, so that the output shaft 8a of the motor 8 rattles and shakes. It is possible to suppress the generation of clearance sounds and the like. Guide portion 12c provided on the ring member 6
The shape may be C-shaped, R-shaped or the like, other than the tapered shape.

Further, a contact portion 12d which comes into contact with the output shaft 8a is provided in the common hole 12b of the ring member 12 inserted into the output shaft 8a of the motor 8 with a diameter smaller than that of the common hole 12b. The load applied to the motor 8 can be reduced by making contact with the contact portion 12d rather than making contact with the output shaft 8a with the entire length of the common hole 12b of the ring member 12. On the other hand, when the ring member 12 is formed by resin molding,
The ring member 12 is deformed due to variations in molding conditions, and twisting occurs between the ring member 12 and the output shaft 8a.
Although the load on the motor 8 may increase, even at that time, by providing the contact portion 12d in the common hole 12b, the influence on the output shaft 8a can be minimized.

When the contact portion 12d is formed in a cylindrical shape, it comes into line contact with the output shaft 8a of the motor 8, so that the ring member 12 does not tilt with respect to the output shaft 8a. Further, when the engaging portion 12a and the contact portion 12d of the elastic member 11 provided on the ring member 12 are aligned with the direction in which the urging force of the elastic member 11 acts (the direction of arrow E), the effect of preventing the inclination of the ring member 12 is ensured. The burrs and the like of the common holes 12b that occur during the manufacture of the ring member 12 cause the ring member 12 to contact the output shaft 8a except at the inclined contact portion 12d, which causes a problem that the load on the motor 8 increases. Can be prevented.

Friction resistance between the ring member 12 and the output shaft 8a,
That is, in order to further reduce the load of the motor 8, the contact portion 12d of the ring member 12 may be formed into a spherical R shape and the contact with the output shaft 8a may be made into a point contact (FIG. 4).
(See (I)).

However, in this case, the direction of the urging force of the elastic member 11 (direction of arrow E) is aligned with the position of the contact portion 12d to prevent the ring member 12 from tilting and to be inserted into the output shaft 8a. By making the through hole 12b larger than the contact portion 12d, the ring member 1 may be slightly inclined or deformed or burr generated when the ring member 12 is formed.
It is possible to prevent 2 from contacting the output shaft 8a except at the contact portion 12d.

Further, as shown in FIGS. 4, (H), (J), and (K), the contact hole 12b is contacted so as to support the direction in which the biasing force of the elastic member 11 acts at two points on both sides. By providing the two portions 12d at two cylindrical locations, the inclination of the ring member 12 with respect to the output shaft 8a can be reliably prevented.

[0019]

As described above, according to the present invention, in the motor side pressure applying device of the disk reproducing device, the insertion of the elastic member into the base, the engagement of the elastic member and the ring member, and the positioning and holding of the ring member are performed by the motor. Simple operation in the output axis direction of
It is possible to assemble and configure by work, and it is possible to automate the motor side pressure adding device of the disk reproducing device and to cope with mechanized production.

Further, the ring member for transmitting the urging force of the elastic member to the output shaft of the motor is provided with the contact portion of the contact surface smaller than the size of the common hole of the ring member in the common hole inserted into the output shaft. In addition, since the shape of the contact portion is prevented from inclining the ring member by the urging force of the member, a load on the motor is reduced, and a motor side pressure adding device that has little influence on the motor starting and starting performance is provided. realizable.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an embodiment showing a motor side pressure applying device of a disc reproducing apparatus of the present invention.

FIG. 2A is a partial plan view of an embodiment showing a motor side pressure applying device of a disc reproducing apparatus of the present invention, and FIG. 2B is a partial sectional side view of the same device.

FIG. 3 is a partial cross-sectional view showing the assembling procedure of the gist of one embodiment of the motor side pressure adding device of the invention.

FIG. 4 is a partial cross-sectional view showing the assembling procedure of the gist of another embodiment of the motor side pressure adding device of the invention.

FIG. 5 is an exploded perspective view showing a motor side pressure adding device of a conventional disc reproducing device.

FIG. 6A is a partial plan view showing a motor side pressure applying device of a conventional disc reproducing device, and FIG. 6B is a partial sectional side view of the device.

[Explanation of symbols]

 8 Motor 8a Output shaft 9 Base 9a Holding part 10 Screw 10a Screw head 11 Elastic member 12 Ring member 12a Engaging part 12b Common hole 12c Guide part 12d Contact part 13 Turntable 14 Disk E Elastic force of elastic member 11 Arrow showing direction Arrow showing insertion direction of G ring member 12

Claims (2)

[Claims] 1. A base to which a motor is fixed, a ring member slidably and rotatably formed with respect to an output shaft of the motor, and an elastic member held by the base. The elastic member and the ring member are engaged with each other by the guide portion provided on the ring member by being inserted and moved in the shaft, and the ring member is held by the urging force of the elastic member, and is also applied to the output shaft of the motor via the ring member. A motor side pressure applying device for a disk reproducing device, characterized in that a biasing force of an elastic member is applied. 2. A ring member inserted into an output shaft of a motor has a sliding portion corresponding to the output shaft formed smaller than a through hole for inserting into the output shaft of the ring member, and a ring urged by an elastic member. 2. The motor side pressure applying device for a disk reproducing apparatus according to claim 1, wherein the sliding portion of the ring member is formed so that the member does not tilt.