JP2000274444A - Rotary body with slipping-out preventive member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obviate the formation of a cutout to a shaft, to increase strength, and to eliminate a deviation of fitting looseness by projecting a slipping-out preventive hook for elastically engaging with a step difference part formed in a hole part of the shaft in a body of a rotary body such as a gear fitted to the cylindrical shaft. SOLUTION: A gear 1 as a rotary body with a slipping-out preventive member is fitted to and installed on a shaft 2, and a slipping-out preventive hook 1b for elastically engaging with a step difference part 2b formed toward the center in a central hole part 2a of the shaft 2 is projected downward in a central part of a cylindrical body 1a of the gear 1. A vertically split groove 1d is formed up to the tip from the base side in this hook 1b. The hook 1b does not contact with an inside surface 2c of the central hole part 2a of the shaft 2 after being fitted in the central hole part 2a of the shaft 2, and is formed in a slightly small diameter so that the cylindrical main body 1a of the gear 1 can freely rotate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a retaining rotator for retaining a rotator such as a gear from a shaft.

[0002]

2. Description of the Related Art As shown in FIGS. 7 (a), 7 (b) and 8, a conventional retaining gear is provided with a retaining hook 1 as shown in FIG.
01 was provided on the shaft 102 side. The retaining hook 101 is connected to the center through hole 10 of the gear 103.
Notches 105 and 105 are provided in the cylindrical portion of the shaft 101 for insertion into the shaft 4, so that the strength of the shaft 102 is reduced, the play of the fitting between the shaft 102 and the gear 103 is deviated, and the external dimension accuracy is deteriorated. There was a problem.

As a conventional disk chucking device, there is one disclosed in Japanese Patent Application Laid-Open No. Hei 7-153158. This is, as shown in FIG.
08 is slidably assembled to the base plate 207, a cam plate 209 having a cam groove 211B for sliding the chucking claw 208 in the disk radial direction is provided, and when the base plate 207 is moved to the turntable 205 side, Chucking pawls provided with cam plate turning means 212A and 212B for turning the cam plate 209 with the movement of the 207, and engaging with the cam groove 211B as the cam plate 209 is turned by the turning means 212A and 212B. 208
Is controlled so as to control the position. However, this has a problem that the structure is complicated, the number of parts is large, and assembly is troublesome.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems and can increase the strength without the need to provide a notch in the shaft, and can fit the shaft to a rotating body such as a gear. The looseness can be eliminated, a proper fitting state can be obtained, and the shaft can be made a simple cylindrical shape, and the dimensional accuracy of the outer diameter can be improved. It is intended to provide a rotating body with a stop.

[0005]

In order to achieve the above object, the present invention is directed to a rotating body such as a gear fitted to a cylindrical shaft, wherein a hole of the shaft is formed in a body of the rotating body. A hook for retaining is elastically engaged with the step formed in the step. The invention described in claim 2 is characterized in that a tapered surface whose diameter decreases on the distal end side is formed on the outer periphery of the distal end of the hook.

The invention according to claim 3 is characterized in that the hook is formed with a vertically divided groove from the base side to the tip. The invention according to claim 4 is such that the hook does not come into contact with the inner surface of the hole of the shaft so that the main body of the rotating body is free to rotate after being fitted into the hole of the shaft. It is characterized by having been constituted. According to a fifth aspect of the present invention, the rotating body is a gear and / or a pulley which is rotated by a drive motor provided in a disk loading device and moves at least one of a disk tray and a chucking arm. It is characterized by.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an embodiment of a rotating body with a retaining member according to the present invention. FIG. 1 is a plan view of a gear as a rotating body with a retaining member according to an embodiment of the present invention, FIG. 2 is a front view of a shaft into which the gear shown in FIG. 1 is fitted, and FIG. 1 is a longitudinal sectional view showing a state where the gear shown in FIG. 1 is fitted and attached, and FIG. 4 is a perspective view showing a state immediately before the gear shown in FIG. 1 is fitted and attached to the shaft shown in FIG.

As shown in FIGS. 1, 3 and 4, the rotating body with a retaining member according to the present embodiment comprises a gear 1, which is fitted into a shaft 2 and mounted. Then, at the center of the cylindrical main body 1a of the gear 1,
A hook 1b for retaining is elastically engaged with a stepped portion 2b formed in the center hole 2a of the shaft 2 so as to face the center. As shown in FIGS. 3 and 4, a tapered surface 1c whose diameter decreases on the distal end side is formed on the outer periphery of the distal end of the hook 1b.

Further, the hook 1b is formed with a vertically divided groove 1d from the base side to the tip. As shown in FIG. 3, the hook 1b is inserted into the center hole 2a of the shaft 2 so that the cylindrical main body 1a of the gear 1 is free to rotate. Inner surface 2
c is formed in a slightly smaller diameter so as not to come into contact with c.

As shown in FIG. 4, the gear 1 which is a rotating body with a retaining member according to the present embodiment is fitted into the shaft 2 from above the shaft 2 so that a tapered surface 1c of a hook 1b is formed.
Is in contact with the step 2 b of the shaft 2,
The hook 1b is inwardly deflated by d and rides over the step 2b. Thereafter, the hook 1b returns outward due to its elasticity, and as shown in FIG. 3, the hook 1e of the hook 1b is engaged with the step 2b of the shaft 2 to prevent the hook 1b from coming off.

According to the gear 1 which is a rotating body with a retaining member according to the present embodiment, it is not necessary to provide a notch in the shaft 2 and the strength can be increased.
Can be eliminated, and a proper fitting state can be obtained. In addition, the shape of the shaft 2 can be made simple cylindrical, and the dimensional accuracy of the outer diameter can be improved. Further, a tapered surface 1c is formed on the outer periphery of the distal end of the hook 1b of the gear 1 and a vertically divided groove 1d is formed from the base side to the distal end, so that when the gear 1 is fitted to the shaft 2, the tapered surface of the hook 1b is formed. Face 1c
Abuts on the step 2b of the shaft 2 and shrinks, gets over the step 2b, and then returns by elasticity, and the claw 1e of the hook 1b engages with the step 2b. Can be performed smoothly.

After the hook 1b is fitted into the center hole 2a of the shaft 2, the inner surface 2c of the center hole 2a of the shaft 2 is rotated so that the cylindrical main body 1a of the gear 1 can rotate freely. Since the hook 1b is fitted into the shaft 2, the gear 1 can be freely rotated with respect to the shaft 2 since the gear 1 is formed to have a slightly smaller diameter so as not to come into contact with the shaft 2.

FIG. 5 is a plan view of a disk loading device provided with a gear and a pulley as a rotating body, and FIG. 6 is a plan view of FIG.
3A and 3B show a meshing state of the gear with the rack of the disk tray and the rack of the cam lever of the checking arm in FIG. 3A, and FIG. 3A is a partially enlarged plan view thereof, and FIG. In the disk loading device 3 shown in FIG. 5, a rotating body is rotated by a drive motor 4 provided in the disk loading device 3, and a three-stage gear 7 for moving the disk tray 5 and the cam lever 6 of the chucking arm. Pulley 8.

The pulley 8 is rotated by a drive motor 4 via a belt 9.
The small gear 8a provided at the center of the gear meshes with the large gear 7a of the three-stage gear 7 to rotate the three-stage gear 7, and the middle gear 7b of the three-stage gear 7 is mounted on the rack 5a of the disk tray 5. The disk tray 5 is moved forward and backward by meshing with the small gear 7.
The intermediate gear 7d meshing with the gear c and the rack 6a of the cam lever 6 of the chucking arm mesh with each other to move the cam lever 6 left and right. The three-stage gear 7 and the pulley 8 which are rotating bodies in the disc loading device 3 also have the same structure as the gear 1 of the above-described embodiment, and are rotatably fitted to the shafts 2A and 2B. . The detailed structure of the gear 1 is almost the same as that of the gear 1 described above, and a detailed description is omitted.

The three-stage gear 7 and the pulley 8, which are rotating bodies in the disk loading device 3, are
It is not necessary to provide notches in A and 2B, so that the strength can be increased, and the play of the fitting between the shaft 2A and the pulley 8 and between the shaft 2BS and the three-stage gear 7 can be eliminated. A joint state can be obtained. Moreover,
The shapes of the shafts 2A and 2B can be made simple cylindrical, and the dimensional accuracy of the outer diameter can be improved.

[0016]

As described above, according to the first aspect of the present invention, the retaining hook which is elastically engaged with the step formed in the hole of the cylindrical shaft is provided on the main body of the rotating body. Since the rotating body is protruded and fitted to the shaft, it is not necessary to provide a notch on the shaft, so that the strength can be increased and the play of the fitting between the shaft and the rotating body such as a gear can be reduced. Can eliminate bias,
An appropriate fitting state can be obtained. Moreover, the shape of the shaft can be made simple cylindrical, and the dimensional accuracy of the outer diameter can be improved.

According to the second aspect of the present invention, the taper surface whose diameter is reduced on the distal end side is formed on the outer periphery of the distal end of the hook, so that when the hook is fitted into the hole of the shaft, the tapered surface is formed. Is brought into contact with the stepped portion of the hole of the shaft and guided and fitted, so that the hook can be easily fitted into the hole of the shaft. According to the invention described in claim 3,
The hook is formed with a vertically split groove from the base side to the tip, so when the tip of the hook comes into contact with the step in the hole of the shaft, it will wither and climb over this step, and then The hook is engaged with the step portion by elasticity, so that the fitting and the engagement can be performed smoothly.

According to the fourth aspect of the present invention, the hook is configured so as not to come into contact with the inner surface of the hole of the shaft after being fitted into the hole of the shaft. , The rotating body can be freely rotated, and the rotating body can be smoothly rotated.

According to the fifth aspect of the present invention, the rotating body is rotated by the drive motor provided in the disk loading device, and the gear and / or the gear for moving at least one of the disk tray and the chucking arm. Since it is a pulley, it is not necessary to provide a notch in the shaft into which these gears and / or pulleys are fitted, so that the strength can be increased, and the play of the fitting between the shaft and the gears and / or the pulleys is eliminated. And a proper fitting state can be obtained. Moreover, the shape of the shaft provided in the disc loading device can be made a simple cylindrical shape, so that the production is easy and the dimensional accuracy of the outer diameter can be improved.

[Brief description of the drawings]

FIG. 1 is a plan view of a gear as a rotating body with a retaining member according to an embodiment of the present invention.

FIG. 2 is a front view of a shaft into which the gear shown in FIG. 1 is fitted and attached.

3 is a longitudinal sectional view showing a state where the gear shown in FIG. 1 is fitted and attached to the shaft shown in FIG. 2;

FIG. 4 is a perspective view showing a state immediately before the gear shown in FIG. 1 is fitted and attached to the shaft shown in FIG. 2;

FIG. 5 is a plan view of a disk loading device provided with a gear and a pulley as a rotating body.

6A and 6B show a meshing state of the gear in FIG. 5 with a rack of a disk tray and a rack of a cam lever of a chucking arm, and FIG. 6A is a partially enlarged plan view thereof, and FIG.
Is a partially enlarged front view thereof.

7A and 7B show a conventional relationship between a gear and a shaft, wherein FIG. 7A is a plan view showing a state where the gear is fitted to and attached to the shaft, and FIG. 7B is a front view of the shaft.

FIG. 8 is a vertical cross-sectional view showing a state where a conventional gear is fitted and attached to a shaft.

FIG. 9 is an exploded perspective view showing a conventional disk chucking device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Gear (rotating body) 1a Cylindrical main body 1b Hook 1c Tapered surface 1d Vertically divided groove 2 Gear 2a Center hole 2b Stepped portion 2c Inner surface 3 Disk loading device 4 Drive motor 5 Disk tray 6 Chucking arm cam lever 7 Three steps Gear (rotating body) 8 Pulley (rotating body)

Claims (5)

[Claims] In a rotating body such as a gear fitted to a cylindrical shaft, a retaining hook is provided on a main body of the rotating body so as to elastically engage with a step formed in a hole of the shaft. A rotating body with a retaining feature. 2. The rotating body with retaining according to claim 1, wherein a tapered surface whose diameter decreases on the distal end side is formed on the outer periphery of the distal end of the hook. 3. The rotating body with retaining according to claim 1, wherein a vertical groove is formed in the hook from a base portion side to a tip end. 4. A structure in which the hook is not in contact with the inner surface of the hole of the shaft so that the main body of the rotating body is free to rotate after being fitted into the hole of the shaft. The rotating body with retaining according to any one of claims 1 to 3, characterized in that: 5. The apparatus according to claim 1, wherein the rotating body is a gear and / or a pulley that is rotated by a drive motor provided in a disk loading device and moves at least one of a disk tray and a chucking arm. The rotating body with retaining according to any one of claims 1 to 4.