JP2002005237A - Rotation stabilizing device, rotation driving mechanism, image forming device and image reading device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotation-stabilizing device which is capable of adjusting the number of vibrations to be reduced while in use, provided with versatility and high degree of freedom, and is able to restrain fluctuations in rotation, thus stabilizing the rotation and to provide a rotation driving mechanism, an image forming device, and an image reading device which are equipped with the rotation-stabilizing device. SOLUTION: A rotation-stabilizing device 11 is equipped with a rotating component 12, an inertial component 13, and coupling components 14 that freely connect and disconnect the rotating component 12 and the inertial component 13. The positions for the coupling components can be freely chosen from two or more of positions 12a and 12c that are located in the directions of the radius from the center of axis of rotation or two or more of positions 12a and 12c that are located on the concentric circle of the center of axis of rotation in the direction of the circumference.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotation stabilizing device for suppressing rotation fluctuation and stabilizing rotation, a rotation driving mechanism including the rotation stabilizing device, and an image capable of suppressing rotation fluctuation in an image carrier such as a photosensitive drum. The present invention relates to a forming device and an image reading device.

[0002]

2. Description of the Related Art In recent years, stabilization of drive technology has been desired in various technical fields. For example, it is known to dispose a damper for driving stability of a motor used for driving a photosensitive drum as an image carrier of an image forming apparatus such as a copying machine.

[0003] In addition to the image forming apparatus, various techniques are employed as techniques for stabilizing the driving of the rotating body. For example, it is known to arrange a damper in order to achieve driving stability of a motor. JP-A-61-9156 discloses a damper for a stepping motor in which a flange fixed to a motor shaft and an inertial body are fixed via an elastic member.

However, in this conventional example, since the elastic body is fixed to the flange portion and the inertial body by an adhesive or baking, the position, number, material, etc. of the elastic body cannot be changed. Similarly, the inertia and the inertial body cannot be changed in size and material, have no versatility, and have a low degree of freedom in use. For this reason, the conventional damper only reduces the specific frequency, and cannot change the frequency to be reduced depending on the mounting object.
Further, even when the elastic body, the inertial body, and the like are deteriorated, they cannot be replaced, and it is necessary to replace the entire damper. As described above, since the conventional structure has no versatility, it is necessary to prepare another type in advance, and the cost increases.

[0005]

SUMMARY OF THE INVENTION According to the present invention, there is provided a rotating apparatus capable of adjusting a frequency to be reduced in use, being versatile, having a high degree of freedom, and capable of suppressing rotation fluctuation and stabilizing the rotation. An object of the present invention is to provide a stabilizing device, a rotation driving mechanism including the rotation stabilizing device, an image forming apparatus, and an image reading apparatus.

[0006]

In order to achieve the above-mentioned object, a rotation stabilizing device according to the present invention comprises a rotating member which rotates about a rotation center axis, and a rotating member which rotates in the axial direction of the rotation center axis. An inertial member disposed at a different position, comprising a viscoelastic member having viscosity and elasticity, comprising a coupling member that detachably couples the rotating member and the inertial member through the viscoelastic member, The attachment position of the coupling member can be adjusted to a position arbitrarily selected from a plurality of positions.

[0007] According to this rotation stabilizing device, the fluctuation of the rotation speed of the rotation member is suppressed by the vibration of the inertia member, and the viscoelastic member having viscosity and elasticity is deformed according to the vibration of the inertia member. Therefore, even when a vibrating force is generated such that the rotation speed fluctuates, the rotation speed fluctuation is suppressed, and the rotating member can stably rotate. Further, since the connecting member detachably connects the rotating member and the inertial member, the viscoelastic member, the rotating member and the inertial member can be easily exchanged, and the combination of the members is free, and the rotation is more stable. Adjustment is easy, and the mounting position of the coupling member can be adjusted to any position selected from multiple positions, so it can be adjusted according to the frequency to be reduced, and rotation stability corresponding to a wider range of frequencies The device can be realized. As described above, a rotation stabilizing device which is versatile and has a high degree of freedom in use can be realized. Further, since the structure is simple, it is possible to realize a low-cost and robust configuration of the rotation stabilizing device.

In this case, the plurality of positions may be a plurality of radial positions radially away from the rotation center axis and / or a plurality of circumferential positions on a concentric circle of the rotation center axis.

[0009] Further, by further comprising a rotating shaft fixed to the rotating member and rotating integrally with the rotating member, the rotating shaft can be connected to a rotating shaft of a motor or the like, and a rotation stabilizing device can be provided for the motor or the like. Can be attached.

[0010] The coupling member may include a mounting member for mounting the viscoelastic member to the rotating member and the inertial member, and a plurality of mounting members for mounting the viscoelastic member to one of the rotating member and the inertial member. By providing the holes at the radial position and the circumferential position, the mounting of the viscoelastic member is facilitated and the mounting position can be easily adjusted. In this case, it is preferable that the circumferential position is a position equally divided in the circumferential direction on the concentric circle.

Further, the viscoelastic member can be attached to the rotating member and the inertia member by providing the mounting member with a flange formed integrally with the viscoelastic member. In this case, it is preferable that the flange of the mounting member is configured to be sandwiched between the rotating member and the inertia member.

[0012] The mounting member may be supported by a support provided on at least one of the rotating member and the inertia member. In this case, it is preferable that the attachment member is screwed or fitted at the support portion. Preferably, the mounting member is inserted into a through hole provided in the viscoelastic member and is supported by the support.

The rotating member is formed in a disk shape,
The inertial member is preferably formed in a disk shape, and in this case, the diameter of the inertial member is preferably larger than the diameter of the rotating member. In this specification, the term "disk-shaped" means a shape viewed when cut in a direction perpendicular to the rotation center axis, and includes a flat plate and a cylindrical shape.

Further, the viscoelastic member is made of a rubber material, and the frequency to be reduced is adjusted by changing the rubber hardness of the rubber material at the radial position and the circumferential position where the coupling member is arranged. Can be.

[0015] The rotation drive mechanism according to the present invention may further include a rotating member that rotates about a rotation center axis, an inertia member disposed at a position different from the rotation member in the axial direction of the rotation center axis, A viscoelastic member having elasticity, and a coupling member that detachably couples the rotating member and the inertial member via the viscoelastic member, wherein a mounting position of the coupling member is arbitrarily determined from a plurality of positions. A rotation stabilizing device that can be adjusted to a selected position, a rotation driving unit, a rotation shaft that rotates with the rotation member by the rotation driving unit, and a rotation transmission mechanism that is connected to the rotation shaft. And

According to this rotary drive mechanism, the rotational speed fluctuation of the rotary member is suppressed by the vibration of the inertia member, and the viscoelastic member having viscosity and elasticity is deformed in accordance with the vibration of the inertia member. Even when a vibrating force causing rotation speed fluctuation occurs in the means, the rotation speed fluctuation is suppressed, and the rotating member of the rotation stabilizing device can rotate stably, so that the rotation shaft can rotate stably and rotate. Stable rotation is transmitted from the shaft. Further, since the coupling member of the rotation stabilizing device detachably couples the rotation member and the inertia member, the exchange of the viscoelastic member, the rotation member and the inertia member is easy, the combination of each member is free, and the coupling member is free. Can be adjusted to a position selected arbitrarily from a plurality of positions, so that it can be adjusted according to the frequency to be reduced, and can support a wider range of frequencies,
Appropriate adjustment for reducing vibration in the rotary drive mechanism is facilitated.

In this case, the plurality of positions may be a plurality of radial positions radially away from the rotation center axis and / or a plurality of circumferential positions on a concentric circle of the rotation center axis.

It is preferable that the rotation stabilizing device further includes a rotation stabilizing device-side rotation shaft fixed to the rotation member, rotated integrally with the rotation member, and connected to the rotation shaft.

Further, the rotation driving means may include a rotation drum, and the rotation member of the rotation stabilizing device may be integrally formed with the rotation drum. In this case, the inertia member is connected to the rotating drum such as the rotor of the motor via the viscoelastic member.

The rotation transmitting mechanism includes a toothed pulley connected to the rotation shaft, a toothed belt meshing with the toothed pulley, and a toothed pulley provided on a driven portion and meshing with the toothed belt. Can be provided. Further, the rotation transmission mechanism may include a first transmission mechanism connected to the rotation shaft.
And a second gear provided on the driven portion and meshing with the first gear. In this case, the pulley and the gear may be integrated with the rotating member of the rotation stabilizing device.

Further, for example, a photosensitive drum, a transfer belt, a transfer drum, or a cleaning unit as an image carrier of an image forming apparatus, or a rotation drive mechanism provided with the above-mentioned rotation stabilizing device in an image reading section of an image reading apparatus is provided. By doing so, it is possible to suppress rotation fluctuation and stabilize rotation with a simple configuration, and furthermore, it is possible to adjust the rotation in accordance with the frequency to be reduced in the rotating part, and the rotation is further stabilized. Thereby, good image formation or image reading can be performed, and good image quality can be obtained.

[0022]

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1A to 1I are diagrams illustrating an example of the rotation stabilizing device according to the present embodiment.

As shown in FIG. 1, the rotation stabilizing device 11
A rotating shaft 12b serving as a center of rotation and a plurality of holes 12a which are arranged on a concentric circle outside the rotating shaft 12b and are equally divided in the circumferential direction.
And a rotating member 12 formed in a flat disk shape having a plurality of holes 12c equally divided in the circumferential direction on the inner concentric circle, and a center having a diameter larger than the rotating shaft 12b of the rotating member 12. A flat disk-shaped inertia member 13 having a plurality of holes 13a and 13c provided respectively corresponding to the holes 13b and the holes 12a and 12c of the rotating member 12, and an elastic and viscous material as a whole. And a plurality of collars 14a, 14b, 14c and
Small diameter part 14d and collar part 14b located between
Members 14 having a small diameter portion 14e located between the rotation member 12 and the inertia member 13
And

As shown in FIGS. 1A to 1C, a plurality of holes 12a on the outer peripheral side of the rotating member 12 and a plurality of holes 1 on the inner peripheral side thereof are provided.
2c are radially arranged on a straight line in the radial direction.

As shown in FIGS. 1 (a) and 1 (e), in the rotation stabilizing device 11, the plurality of coupling members 14 have elastic properties, and the rotating members 12 are elastically deformed at the collar portions 14a to 14c. When the elastic member 13 is pressed into the holes 12a and 12c and the holes 13a and 13c of the inertia member 13 and then elastically restored, the inertia member 13 is located between the flanges 14a and 14b, and the small-diameter portion 14d is The rotating member 12 is located opposite to the inner peripheral surface of each of the holes 13a and 13c of the member 13, and the rotating member 12 is sandwiched between the one flange portions 14b and 14c. 12a, 1
2c is located facing the inner peripheral surface.

As described above, the coupling member 14 serves as both a viscoelastic member and a mounting member, and utilizes the elastic deformation and restoration of the collar portions 14a to 14c to rotate the rotating member 12 and the inertia member 13
And both can be connected via a viscoelastic member. Further, the coupling member 14 can be easily removed from the holes 12a and 12c of the rotating member 12 and the holes 13a and 13c of the inertia member 13 due to its elastic deformation.

In this case, the flanges 14a and 14b of the coupling member 14 are connected to the inertia member 13 and the flanges 14b and
4c is relatively intimate with the rotating member 12, while
The small diameter portions 14d, 14e of the coupling member 14 are
It is located relatively gently on the inner peripheral surface of 2c, 13a, 13c. Thereby, each coupling member 14 is connected to each hole 12a, 1
It can be rotated around 2c, 13a, 13c.

As shown in FIG. 1 (a), in the rotation stabilizing device 11, the coupling member 14 includes the holes 13a and 12a and the holes 13a.
The holes 13a on the outer peripheral side are not disposed on all of the holes c and 12c, but are disposed alternately on the holes 13a on the outer peripheral side and the holes 13a on the inner peripheral side with a different phase from the holes 13a. The coupling member 14 can be arbitrarily changed and arranged in accordance with the frequency to be reduced, and can be attached to an arbitrary position among the holes 13a and 12a and the holes 13c and 12c.

The viscoelastic member constituting the coupling member 14 can have dimensions such as diameter and length so as to reduce a specific frequency, and may have a shape other than a cylindrical shape. It can be. For example, a grommet (manufactured by NOK) or the like can be used.

As the material having such elasticity and viscosity, a material having an optimal damping characteristic for the frequency of the vibration to be reduced and having a tan δ of 0.05 or more is preferable. Such materials include natural rubber and synthetic rubber, for example, NBR (acrylonitrile-butadiene rubber), IBR
IR (butyl rubber), silicon rubber, EPDM (ethylene-propylene-non-conjugated diethane) and the like can be used, but are not limited thereto. The rubber hardness is preferably in the range of 20 to 70 degrees.

The rotating member 12 is made of iron,
Metals such as aluminum and brass, resins such as POM and ABS can be used, and sheet metals, sintered products, cut products, and resin molded products manufactured from these materials can be used. It is not limited.

The inertia member 13 can be made of the same material as the rotation member 12, but it is preferable that at least one of the inertia member 13 and the rotation member 1 is made of metal.
More preferably, both are made of metal.

The rotation stabilizing device 11 as described above is similar to that shown in FIG.
As shown in (e), a rotating shaft 20 such as a motor is fitted to and connected to the rotating shaft 12b of the rotating member 12. The rotation of the rotation shaft 20 of the motor or the like causes the rotation member 12 of the rotation stabilizing device 11 to rotate together with the inertia member 13. The vibration of the inertia member 13 during rotation suppresses fluctuations in the rotation speed of the rotation member 12 and causes the rotation. Since the member 14 (viscoelastic member) is deformed in response to the vibration of the inertial member 13, even when a vibrating force is generated in the rotating member 12 due to the motor or the like, the rotational speed fluctuation is not affected. The rotation member 12 can be stably rotated. as a result,
The rotation shaft 20 can stably rotate while suppressing vibration.

Further, since the connecting member 14 detachably connects the rotating member 12 and the inertia member 13, the exchange of the connecting member 14, the rotating member 12 and the inertial member 13 as a viscoelastic member is easy, and Combinations of the members 12, 13, and 14 are free, and adjustment for stabilizing the rotation is easier, and a rotation stabilizing device that is versatile and has a high degree of freedom in use can be realized. As described above, since the viscoelastic member, the rotating member, and the inertia member can be easily rearranged in the rotation stabilizing device, the cost of the prototype can be reduced, and the degree of freedom of design and the optimization of the vibration reduction design can be achieved at low cost. Also,
As described above, the structure of the rotation stabilizing device is simple and robust, and has high durability, so that stable performance can be obtained for a long period of time.

Further, since the mounting position of the coupling member 14 (viscoelastic member) can be arbitrarily selected from among a plurality of holes, it can be adjusted in accordance with the frequency of the motor or the like to be reduced, so that a wider range of frequencies can be obtained. Accordingly, a rotation stabilizing device that can further stabilize rotation can be realized. As described above, the natural frequency can be designed in a wider range. For example, the natural frequency can be lowered when the coupling member (viscoelastic member) is close to the rotation center axis, can be increased when the coupling member is separated, and can be increased. Viscoelastic member)
When the number is reduced, the natural frequency can be lowered, and when it is increased, it can be raised. The same adjustment can be made when the rubber hardness is changed. The natural frequency increases as the hardness increases, and decreases as the hardness decreases. Therefore, it is possible to cope with the problem even if the frequency of the problem to be reduced differs for each motor or unit by using only the components of the coupling member (viscoelastic member), and it is possible to reduce the cost of components.

As described above, by changing the number, position, and rubber hardness of the coupling members (viscoelastic members), the degree of freedom in designing the natural frequency is improved, and the motor and the unit can be covered in a wider range. .

When the outer shape of the rotating member or the inertia member is changed, the moment of inertia can be changed and the natural frequency can be changed, but the moment of inertia is set to an amount such that the motor does not step out. And the outer diameter is limited by space, so the adjustment range is narrow. The rubber hardness is limited to about 20 to 70 degrees, and the adjustable range is narrow. Therefore, in particular, by making the number of coupling members (viscoelastic members) and the mounting position adjustable, the adjustment range is dramatically improved compared to the conventional case where the number of viscoelastic members and the mounting position are constant. I do.

Another rotation stabilizing device 21 will be described with reference to FIGS. This rotation stabilizing device 21 has the same configuration as that of FIG. 1 except that the coupling member is composed of a viscoelastic member and a mounting member. Therefore, the same portions are denoted by the same reference numerals and description thereof is omitted.

As shown in FIGS. 2 (d), (e), (i) and (j), the connecting member connecting the rotating member 12 and the inertial member 13 is made of a material having elasticity and viscosity as a whole. A viscoelastic member (grommet) 24 having flange portions 24a, 24a at both ends thereof, a small diameter portion 24b formed between the flange portions 24a, and a through hole 24c formed in the center; A mounting member 2 having a screw portion 25b inserted into the through hole 24c of the member 24 and screwed into the screw hole 12c of the rotating member 12, and a step 25a in the middle.
And 5.

As shown in FIGS. 2 (a) and 2 (f), in the rotation stabilizing device 21, the viscoelastic member 24 is elastically deformed into each of the holes 13a and 13c of the inertial member 13 and is pushed in to restore elasticity. The inertia member 13 is located between the flanges 24a and 24a, and the small-diameter portion 2 is provided on the inner peripheral surface of each of the holes 13a and 13c.
4b, the mounting member 25 is inserted into the through hole 24c and screwed into the screw hole 12c of the rotating member 12. Thereby, the rotating member 12 and the inertia member 1
3 are connected via a viscoelastic member 24. in this case,
Since the mounting member 25 has a step 25a and comes into contact with the surface of the rotating member 12, the mounting member 25 maintains the viscoelastic member 24 at a constant distance between the collar portions 24a and does not needlessly compress and deform. .

As described above, in the rotation stabilizing device 21, by loosening the screw of the mounting member 25, the rotation member 1
2 and the inertial member 13 can be easily removed, and the viscoelastic member 24 can be elastically deformed and easily removed from each hole 13a of the inertial member 13. The material of the mounting member 25 is preferably a material having higher rigidity than the viscoelastic member.

According to the rotation stabilizing device 21 described above, FIG.
As shown in FIG. 1F, the same effect as in FIG. 1 can be obtained by being connected to the rotating shaft 20 such as a motor. The small diameter portion 24b of the viscoelastic member 24 is relatively gently located on the inner peripheral surfaces of the holes 13a and 13c of the inertial member 13, and the viscoelastic member 24 is
a, 13c. Further, in FIG. 6, the viscoelastic member is attached to the hole 13a of the inertial member 13, but may be attached to the hole on the rotating member 12 side and formed with a screw hole in the inertial member.

As shown in FIG. 2A, in the rotation stabilizing device 21, the viscoelastic member 24 and the mounting member 25
The holes 3a and 12a are not arranged in all the holes 13c and 12c, but are arranged every other hole 13a on the outer peripheral side and every other hole 13c on the inner peripheral side with a different phase from the hole 13a. . The viscoelastic member 24 can be arbitrarily changed and arranged in accordance with the frequency to be reduced, and can be attached to an arbitrary position among the holes 13a and 12a and the holes 13c and 12c.

Next, another rotation stabilizing device 31 will be described with reference to FIGS. 3 (a) and 3 (b). This rotation stabilizer 31
Uses the same inertial member, viscoelastic member, and mounting member as in FIG. 2, but has a configuration in which the rotating member does not particularly have a rotating shaft. That is, the rotor 32 constituting the DC outer rotor motor is used as a rotating member, and the inertia member 13 is mounted on the end surface 32a of the mounting member 2 via the viscoelastic member 24 as in FIG.
5 screwed.

The rotating shaft 33 is rotatable via a bearing 36 of a cylindrical portion 33a integrated with the motor mounting plate 35, and is connected to the rotor 32 and rotates integrally. Cylindrical part 3
When the coil 33b on the outer periphery of 3a is energized from the motor electric board 35a, when the rotor 32 and the rotating shaft 33 rotate by the action of the magnet 34 on the inner periphery of the roller 32, the rotation speed of the rotor 32 fluctuates in the motor. Even when such a vibrating force is generated, the rotation speed fluctuation is suppressed by the rotation stabilizing device 31, the rotor 32 and the rotating shaft 33 can be rotated stably, and the same effect as in FIG. 5 can be obtained. In particular, the DC motor is apt to cause speed fluctuation due to cogging in a low rotation region. However, since this configuration can absorb the speed fluctuation, a stable rotation speed can be obtained even at low rotation. In particular, it is effective to match the frequency of the cogging component with the natural frequency of the rotation stabilizing device 31. For this purpose, the plurality of holes 13a and 12a are adjusted in accordance with the natural frequency of the viscoelastic member 24 to be reduced.
a) By arranging the holes 13c and 12c at arbitrary positions among the holes 13c and 12c, the rotation can be further stabilized.

In each of the above-mentioned rotation stabilizing devices,
A fixed flyhole may be used in combination. Further, the rotating member may be made of a material having viscosity and elasticity. Further, a viscoelastic member may be integrally formed with the rotating member of the viscoelastic material.

Next, FIG. 4 shows a modification of the viscoelastic member which can be used in FIGS. This viscoelastic member 2
Numeral 4 'is provided with a plurality of linear small projections 24d continuous from the surface of the flange 24a to the inner peripheral surface of the through hole 24c. The small protrusion 24d radially extends in the radial direction on the collar portion 24a, and linearly extends in the vertical direction on the inner peripheral surface of the through hole 24c. The vibration damping characteristics can be adjusted by the height and number of the small protrusions 24c.

Next, referring to FIGS. 5A and 5B, a description will be given of a rotation drive mechanism provided with a rotation stabilizing device substantially similar to that of FIG. 5A includes a rotation stabilizing device 41, a motor 42, a rotation shaft 43 of the motor, a toothed pulley 44 fixed to one end 43a of the rotation shaft 43 of the motor 42, and a toothed pulley 44. A pulley 44 is provided with a toothed drive belt 45 that meshes with the pulley 44.

A rotation transmission mechanism is constituted by a toothed drive belt 45 meshing with the toothed pulley 44 and another toothed pulley (not shown) provided on the driven portion. Motor 4
As a result of the rotation of the second rotation shaft 43 being stabilized by the rotation stabilizing device 41, the rotation of the driven portion transmitted by the rotation transmission mechanism is stabilized. Further, since the viscoelastic member 24 can be arranged in an arbitrary hole according to the frequency to be reduced,
Vibration can be reduced more effectively, and rotation is more stable, which is preferable.

The rotation stabilizing device 41 includes the viscoelastic member 2
4 is mounted on the rotating member 12 side, and is configured to be coupled to a screw hole of the inertia member 13 by the mounting member 25.

In addition, by forming the pulley 44 integrally with the rotating member 12 of the rotation stabilizing device 41 in FIG. 5A, the structure can be simplified, the number of parts can be reduced, and the cost can be reduced.

5B, the toothed pulley 44 is fixed to one end 43a of the rotary shaft 43 of the motor 42, and the rotation stabilizing device 41 is connected to the other end 43b of the rotary shaft 43.
It is attached to the side. Thereby, the same effect as that of FIG. 5A can be obtained.

Next, FIGS. 6 (a), (b), (c),
(D), another rotation drive mechanism will be described. FIG.
In the example of (a), the first gear 53 fixed to the rotating shaft 54 of the motor 52 drives the second gear 55 shown by a broken line. A rotation stabilizing device 51 similar to that shown in FIG.
Are inserted and fixed by screws 52. The rotation stabilizing device 51 includes a rotating member 12 provided with the viscoelastic member 24 attached to the gear 53 side, and an outer inertia member 13 connected by an attaching member 25. Rotary shaft 5 of motor 52
As a result of the rotation of the rotation of the rotation unit 4 being stabilized by the rotation stabilizing device 51, the rotation of the driven portion transmitted by the gear mechanism as the rotation transmission mechanism is stabilized. Since the viscoelastic member 24 can be arranged in an arbitrary hole in accordance with the frequency to be reduced, the vibration can be reduced more effectively, and the rotation is more stable, which is preferable.

In the example of FIG. 6B, the rotation stabilizing device 61 is
The inertia member 13 is provided on the gear 53 side, and the rotation shaft 12b of the rotation member 12 to which the viscoelastic member 24 is attached passes through the center hole 13b of the inertia member 13 and is fixed to the rotation shaft 54 by the screw 52 on the gear 53 side. It is composed.

In the example of FIG. 6C, the rotation stabilizing device 71 is
The rotary member 12 is provided on the gear 53 side in synchronization with FIG. 6A, but the viscoelastic member 24 is attached to the inertial member 13. 6B and 6C, FIG.
The same effect as (a) can be obtained.

Also, as in the example of FIG.
The rotation member 1 of the rotation stabilizing device 81 has the same configuration as that of FIG.
The drive gear 82 may be integrated with the drive gear 2, so that the configuration can be simplified, the number of parts can be reduced, and the cost can be reduced.

Next, an image forming apparatus will be described as an embodiment. FIG. 7 is a diagram illustrating a part of a copying machine that is an image forming apparatus according to the present embodiment.

In FIG. 7, a photosensitive drum 1 as an image carrier is mounted so as to rotate integrally with a drum shaft 2, and the drum shaft 2 is rotatably supported by a bearing (not shown). ing. To the right of the photosensitive drum 1,
The gear 3 is mounted so as to rotate integrally with the drum shaft 2. The gear 3 is in mesh with the gear 4,
The rotation torque is received from a motor (not shown) via the gear 4.

A flywheel (rotating member) 5, which is a large-diameter disk, is mounted on the right side of the gear 3 so as to rotate integrally with the drum shaft 2. Further, to the right of the flywheel 5, an inertia portion (inertial member) 6, which is a disk having the same diameter as the flywheel 5, is not provided directly with respect to the drum shaft 2, but a grommet of a viscoelastic member described later. 8 and is attached to the flywheel 5. The lower end edge of a rectangular plate-shaped scraping blade 7 is in contact with the outer peripheral surface of the rotary drum 1.

FIG. 8 is a partial cross-sectional view showing an enlarged part II of the configuration of FIG. FIG. 9 is an enlarged view showing a part III in the configuration of FIG. As shown in FIGS. 8 and 9, the flywheel 5 and the inertia part 6 are connected via a grommet 8 and a bolt 9. The mode of such connection will be described in more detail. Screw holes 5a are formed in the flywheel 5 at intervals of 90 degrees, while through holes 6a are formed in portions of the inertia portion 6 corresponding to the screw holes 5a. Further, the grommet 8 is attached so as to pass through the through hole 6a.

The grommet 8 is formed integrally from a viscous and elastic material and has two parallel disk portions 8a,
8b are connected by a cylindrical portion 8c having a smaller diameter than that of the cylindrical portion 8b, and a through hole 8d is formed in the center of the cylindrical portion 8c. As shown in FIG. 9, the outer diameters of the disk portions 8a and 8b are larger than the inner diameter of the through hole 6a of the inertia portion 6,
Since the grommet 8 has elasticity, it can be made small enough to pass through the through-hole 6a of the inertia portion 6 by compressing the outer periphery of one of the disk portions 8a and 8b. Further, after passing through the through hole 6a, the disk portion 8a (or 8b)
The grommet 8 returns to the original diameter again, so that the grommet 8 does not drop accidentally after being attached.

The grommet 8 is inserted into the through hole 6 of the inertia portion 6.
a, the sleeve 10 with the flange is fitted into the through hole 8a of the grommet 8 and the sleeve 1
Screw 9 into the screw hole 5a of the flywheel 5
, The flywheel 5 and the inertia part 6 are connected via the grommet 8. In this embodiment, the grommet is a name representing a member having viscosity and elasticity having the shape shown in FIG. 9, and therefore, regardless of the name, another member having the same shape and function is used. Of course, it can be used.

[0063] Elasticity refers to a property in which, when the applied load is removed and the stress is removed to eliminate the stress, distortion is eliminated and the shape returns to the original shape. Viscosity refers to the property of one layer of the fluid relative to another layer. The property of creating internal friction along its interface and resisting flow as a result of adhesion and cohesion when it is moved.

Here, the spring constant of the grommet 8, the natural frequency F 1 of torsion obtained from the moment of inertia of the flywheel 5, the gears 3 and 4 for driving the photosensitive drum 1 and the inertia section 6, and the inertia section 6 , And the natural frequency F2 of torsion obtained from the photosensitive drum 1 and the inertia moment of the inertia section 6 of the shaft 2 that connects
It is preferable that the following formula is satisfied. 0.5 × F2 ≦ F1 ≦ 2 × F2 (1) Thus, the second shaft 2 connecting the gears 3 and 4 that drive the photosensitive drum 1 and the inertia unit 6 to the inertia unit 6
By bringing the natural frequency F2 of the vibrating system close to the natural frequency of the first vibrating system including the grommet 8 and the flywheel 5, a so-called dynamic damper effect can be expected. When the first vibration system vibrates, the second vibration system vibrates (uneven speed).
Can be suppressed. On the other hand, the vibration of the first vibration system is converted into heat by the deformation of the grommet 8, so that the vibration is effectively attenuated.

FIG. 10 (a) shows the transfer function of the drive system (gears 3, 4) obtained experimentally in the configuration of FIG. 7, in which the vertical axis represents the transmission magnification and the horizontal axis represents the frequency. It is shown. FIGS. 10B and 10C are diagrams showing changes in the speed unevenness of the photosensitive drum 1 similarly obtained by experiments, in which the vertical axis indicates the speed unevenness and the horizontal axis indicates the frequency. Here, the transmission magnification can be expressed by the ratio of the displacement of the member B to the displacement of the member A when the member B supporting the member A is vibrated via the vibration isolating material. This is a value indicating the vibration isolation characteristics of the vibration material.

The transfer function shown in FIG. 10A includes a motor control signal including a fluctuation component that causes a speed fluctuation, and a motor speed fluctuation at each frequency when the frequency is changed, and a speed fluctuation of the photosensitive drum 4. Was determined from the ratio of The speed variation of the motor was obtained from the encoder output on the motor shaft, and the speed variation of the photosensitive drum was obtained by irradiating the photosensitive drum 4 with laser light and analyzing the scattered light by FFT. Incidentally, the moment of inertia of the flywheel 5 was 50% of the moment of inertia of the photosensitive drum 1 and the inertia portion 6. Details of the measuring device are omitted.

In the copying machine of this embodiment, the photosensitive drum 1 accumulates electric charge from a charging device (image forming means) (not shown) during one rotation, adsorbs the toner on the outer peripheral surface, and Is transferred to paper, and the remaining toner is removed by a scraping blade 7 or a fabran or the like. Before the next charge is accumulated, an operation of removing the residual toner from the photosensitive drum is sequentially performed. I have.

As described above, when the photosensitive drum 1 is rotated by receiving the power from the motor (not shown) via the gears 3 and 4, the photosensitive drum 1 is vibrated by the resistance of the scraping blade 7 and the fiber blade, and the drum shaft 2 is rotated. Therefore, resonance of torsional vibration occurs. In such a case, the inertia portion 6 and the grommet 8
Is not provided, the transmission magnification of the drive system increases as shown by the two-dot chain line A in FIG.
As shown in (b), a speed unevenness near 1.5% occurs near a frequency of 30 to 100 Hz (a natural frequency of a torsional vibration system including the photosensitive drum 1, shaft 2, gear 3, and flywheel 5). It has been found.

On the other hand, in the case of the present embodiment, by providing the inertia portion 6 and the grommet 8,
As shown by the dotted line B in FIG. 10A, the transmission magnification of the drive system is reduced by about 50%. As a result of the decrease in the vibration gain, a natural frequency close to the natural frequency of the torsional vibration system (30
It has been found that the amplification ratio at −80 Hz) is reduced, and as a result, as shown in FIG. 9C, the speed unevenness can be suppressed to 0.5% or less.

Considering the experimental results, the reason why the present embodiment can greatly reduce the transmission magnification of the drive system at the frequency of 30 Hz to 80 Hz is considered as follows. That is, the torsion natural frequency F1 obtained by the spring constant of the grommet 8, the inertia moment of the flywheel 5, and the shaft connecting the gears 3, 4 for driving the photosensitive drum 1 and the inertia portion 6 and the inertia portion 6. Since the natural frequency F2 of the torsion obtained by the composite spring constant of No. 2 and the moment of inertia of the photosensitive drum 1 and the inertia portion 6 satisfies the above-described expression (1), a so-called dynamic damper effect occurs. , Frequency 30Hz-80
At Hz, the system composed of the inertia portion 6 and the grommet 8 resonates, and the angular displacement becomes large with respect to the flywheel 5 in both directions.
It is considered that the resonance of

On the other hand, the flywheel 5 of the inertia portion 6
Is converted into heat by deformation (e.g., expansion and contraction or twisting) of the viscous grommet 8 and is attenuated. In addition, as a material of the grommet 8, if the attenuation characteristic is a loss coefficient tan δ ≧ 0.05,
It has been found that the speed fluctuation can be reduced well. Here, the loss coefficient tan δ is a value representing the vibration absorbing performance of a material such as rubber, and indicates that the larger the value, the better the vibration absorbing property. Is 0 to 60 ° C. and the measurement frequency is 10
As a result of measurement at Hz, dynamic strain is represented by a maximum value in tension. Note that the loss coefficient tan δ
Since the measurement is based on ISK6394 and will not be described in detail below, the measurement frequency is 3 to 100 Hz, and the dynamic strain may be any maximum value of shear, compression, and tensile measurement.

The moment of inertia of the inertia portion 6 is
20% or more of the moment of inertia of the photosensitive drum 1 and the flywheel 5 (preferably 30% to 120%,
It has been found that setting the speed to more preferably 30% to 100%) can more effectively reduce the speed fluctuation.

In FIG. 10A, the rotation frequency of the drive motor for driving the drum shaft 2 is about 30 Hz, and the meshing frequency of the gear 3 is considered to be about 100 Hz. A natural frequency f = expressed by the inertia moment I2 of the inertia portion 6 =
(1 / 2π) · √ (K1 / I2) is lower than 30 Hz, or 100 when higher than 30 Hz.
Hz.

When the natural frequency f is set in this manner, there is no possibility that resonance will occur in the inertia portion 6 based on at least the rotation frequency of the drive motor or the meshing frequency of the gear 3, so that the photosensitive drum 1 can be more effectively used. Rotation speed fluctuation can be suppressed.

The grommet 8 shown as an example in FIG. 9 is available on the market in various diameters and lengths and is relatively easily available. The speed fluctuation can be suppressed optimally at low cost.

Further, a screw hole 5a of the flywheel 5
A plurality of through holes 6a of the inertia portion 6 are provided in the radial direction, so that the mounting position of the grommet 8 can be easily changed in the radial direction. Therefore, by changing the mounting position and the number of grommets 8 by mounting a plurality of grommets 8 in the radial direction, etc.
Adjustment can be made according to the frequency at which the transmission magnification of the drive system is to be reduced (that is, the natural frequency of the torsional vibration system).

Here, the diameter d1 (cm), the hole diameter d2 (cm), the mass w (k
g)) Inertia I and torsion spring constant K2 can be obtained from the following equations. ^{I = w (d1 2 + d2} 2) / 8 (kgcm 2) (1) 'K2 = I (2πF2) 2/980 (kgfcm / rad) (2) where, F2 is transmitted illustrated in FIG. 10 (a) The peak frequency of the function, which is the natural frequency.

More specifically, the condition A in FIG. 10A (the same condition as in FIG. 10B) is that the inertia Ib of the photosensitive drum = 19.5 (kgcm ² ) and the inertia Ifw of the entire flyhole = 58.5 x 3 = 175.5 (kgc
m ² ), and I = Ib + Ifw = 195 (kgcm ² ). The natural frequency F2 is 22 Hz from FIG.
Therefore, from equation (2), the torsional spring constant of the drive system K2 = 1
^{95 × (2π × 22) 2} /980 = 3798 (kgfcm / ra
d).

The condition B (FIG. 1) in FIG.
0 (c) is the same as the inertia I1 of the photosensitive drum and the flyhole = 58.5 × 2 + 19.5 = 136.5.
(kgcm ² ), inertia I2 of the inertia part = 58.5 (kg
cm ² ) (d1 = 22 cm, d2 = 5 cm, w = 0.9 k)
g), and I = I1 + I2 = 195 (kgcm ² ).

The combined spring constant K1 and the natural frequency F1 of the three grommets can be obtained as follows. The grommet material is manufactured by NOK (HDR-
C), a rubber hardness of 40 degrees, and tan δ = 0.8.

As shown in FIG. 15 (a), the natural frequency F1 is determined by fixing the flyhole 151 to which the inertia part 152 is attached by the grommet 153 with the base 154,
As shown in FIG. 15B, the frequency response data obtained by vibrating the inertia part 152 in the rotational direction with the vibration hammer 158, measuring the response with the acceleration sensor 157, and analyzing with the FFT analyzer 156. From the peak frequency of As a result, the natural frequency F1 is 23.5 Hz. The composite spring constant K1 is obtained as follows. K1 = I2 × (2π × F1) ² /980=58.5
^{× (2π × 23.5) 2/} 980 = 1300 (kgfcm / ra
d).

Next, the transmission magnification when the mounting position of the viscoelastic member (grommet) is properly adjusted as in the rotation stabilizing device of FIG. 2 is shown by a curve C in FIG. 10 (a). Thus, it was found that the transmission magnification was lower than the curve B indicating the transmission magnification of the configuration in which the grommet was attached, and the transmission magnification could be reduced. In this way, the same kind of viscoelastic member can be prepared by previously providing a larger number of mounting holes than the number of viscoelastic members (grommets) so that the mounting position of the viscoelastic members (grommets) can be adjusted. For example, since it can correspond to various models with different natural frequencies,
The number of types of parts can be reduced and cost can be reduced. Also,
Adjustment of the viscoelastic member mounting position as shown in Fig. 1 and Fig. 2 enables optimal damper design for multiple models, even if adjustment of rubber hardness or inertia amount does not provide sufficient effects. Becomes

Next, an example in which the above-described rotation stabilizing device is provided in the rotation driving mechanism of the transfer belt of the image forming apparatus will be described with reference to FIGS. As shown in FIG. 11, a transfer belt 101 as a belt-shaped image carrier of the image forming apparatus is formed of a photosensitive member, and an image formed on the surface 101a is transferred by a transfer device 107 in a direction F. The image is transferred to the sheet S. Transfer belt 101
Is driven by the rotation of the drive roller 102 to rotate the rotation roller 1.
The transfer sheet S is conveyed in the direction F between the rotating roller 106 and the roller 104 while moving in the direction Y between 03, 104, and 105.

As shown in FIG. 12, the rotation driving roller 102 for rotating the transfer belt 101 has its rotating shaft 10
2a is a motor 113 via a gear 111 and a gear 112
Is driven to rotate. A gear 113 is connected to one end 114a of a rotating shaft 114 of the motor 113, and the other end 114b
The rotation stabilizing device 115 similar to the above is connected to the side.

When the motor 113 is driven, the rotating shaft 11
4, the rotary drive roller 102 rotates via the gears 112 and 111, the rotary shaft 102a, and the like.
Even when a vibrating force that causes a rotation speed fluctuation occurs in 13, the rotation speed fluctuation is suppressed by the operation of the rotation stabilizing device 115, and the rotation shaft 114 can rotate stably while suppressing the vibration. Drive roller 102
Rotation becomes stable. Therefore, the transfer belt 101 can move in the direction Y at a stable constant speed. Therefore, the transfer of the image from the transfer belt 101 to the transfer sheet S by the transfer device 107 is performed stably and reliably, and higher quality image formation is possible. Also,
2, the viscoelastic member 24 can be arranged in an arbitrary hole in the rotation stabilizing device 115 in accordance with the frequency to be reduced in the motor 113 or the like, so that the vibration can be reduced more effectively. The rotation is stable and preferable.

As described above, according to the image forming apparatus provided with the rotation stabilizing device of the present embodiment, complicated control is not required to obtain good image quality, so that expensive circuits and motors need to be used. And can be configured with a small number of components, which can contribute to cost reduction.

Conventionally, when a speed fluctuation occurs in an image carrier such as a photosensitive drum or a transfer belt of an image forming apparatus,
The image quality is degraded. The cause of this is fluctuations in the load applied to these image carriers. However, since these load fluctuations are not always regular with respect to the magnitude and time, the driving of the image carriers is expected in anticipation of the load fluctuations. Although the force could not be changed, the use of the rotation stabilizing device according to the present invention can suppress the speed fluctuation due to the load fluctuation and stabilize the rotation, so that such a problem can be solved.

Next, an example in which a rotation stabilizing device similar to that described above is provided in a fur brush cleaning unit having a rotation driving mechanism in an image forming apparatus will be described with reference to FIGS. 13 (a) and 13 (b). As shown in FIG. 13A, in the vicinity of the photosensitive drum 121 of the electrophotographic image forming apparatus, a latent image formed on the surface of the photosensitive drum 121 is developed with toner, and then used for the next image formation. A cleaner unit 122 for cleaning residual toner on the photosensitive drum 121 is provided. The cleaner unit 122 includes a cleaning blade 123 that scrapes residual toner from the photosensitive drum 121 that rotates in the direction of the arrow in the figure, and a fur brush that contacts the photosensitive drum 121 downstream of the cleaning blade 123 to perform auxiliary cleaning. 124,
A toner conveying screw 125 for conveying the scraped toner to the outside of the cleaner unit 122;

As shown in FIG. 13B, the fur brush 124 has its rotating shaft rotatably supported at both ends by bearings 129, and is connected to the rotating shaft 127 a of the driving pulley 127 via a POM coupling 128. , Driven by a drive pulley 127. The drive pulley 127 is
It is rotationally driven by a driving motor (not shown) via a belt 127b, and a rotation stabilizing device 126 similar to that described above is connected to the rotating shaft 127a. In this example, the rotation stabilizing device is not disposed on the drive motor side, and the rotation shaft 127a of the drive pulley 127 connected to the rotation shaft of the fur brush 124
Although it is provided on the side, the rotation of the rotating shaft of the fur brush 124 can be stabilized even if the speed of the rotating shaft 127a fluctuates as described above.

The fur brush 124 is used for the photosensitive drum 12
1 and has substantially the same or a peripheral speed difference as the peripheral speed of the photoconductive drum 121. Therefore, when a speed fluctuation occurs in the fur brush 124, the speed fluctuation is transmitted to the photoconductive drum 121 and the speed fluctuation is applied to the photoconductive drum 121. However, in this example, the speed fluctuation of the fur brush 124 can be prevented by providing the rotation stabilizing device on the rotating shaft side of the fur brush 124 as described above. As a result, fluctuations in the speed of the photosensitive drum 121 can be prevented, image unevenness does not occur, and high image quality can be realized. Further, the viscoelastic member 24 is connected to the drive pulley 127 and its rotating shaft 1 in the rotation stabilizing device 126 as in FIG.
Since it can be arranged in an arbitrary hole according to the frequency to be reduced in 27a, fur brush 124, etc., vibration can be reduced more effectively, and rotation is more stable, which is preferable. The rotation stabilizing device may, of course, be arranged on the drive motor side of the drive pulley 127.

Next, with reference to FIG. 14, an example in which a rotation drive mechanism using a stepping motor as a motor in the image reading apparatus, for example, in FIG. 5A or 5B will be described. The image reading apparatus shown in the figure has a stepping motor 131 provided with a rotation stabilizing device similar to that shown in FIG.
A drive pulley 133 driven by a motor 131 via a timing belt 132 to rotationally drive a rotary shaft 134
A wire 135 stretched around the apparatus and driven by rotation of a rotating shaft 134; and an optical source such as a light source or a mirror that is driven in the direction X in the drawing by driving the wire 135 and exposes the original to read an image from the original. Exposure unit 1 including system
36 and a V mirror unit 137.

Since the rotation stabilizing device is provided in the stepping motor 131, the rotation of the stepping motor 131 is stabilized even if the rotation fluctuates, and the movement of the exposure unit 136 and the V mirror unit 137 by the wire 135 is stabilized. Therefore, more accurate image reading can be realized, which is preferable. Further, the viscoelastic member 24 can be arranged in an arbitrary hole according to the frequency to be reduced in the stepping motor 131 or the like in the rotation stabilizing device, as in FIG. 2, so that the vibration can be reduced more effectively. It is preferable because the rotation is more stable.

The present invention has been described with reference to the embodiments. However, the present invention should not be construed as being limited to the above embodiments, and it is needless to say that the present invention can be appropriately changed and improved. is there. For example, it is conceivable to omit the flywheel 5 and directly attach the inertia portion 6 to the photosensitive drum 1. A similar effect can be obtained even if a disk is made of a member having viscosity and elasticity and is directly attached between the flywheel 5 and the inertia portion 6. Further, the inertia portion 6 itself may be formed of a member having viscosity and elasticity, and may be connected to the flywheel 5 by a screw. In addition, the image carrier may be like an endless belt stretched around a cylindrical member.

[0094]

According to the present invention, a rotation stabilizing device capable of adjusting the frequency to be reduced in use, being versatile, having a high degree of freedom, and capable of suppressing rotation fluctuation and stabilizing rotation. And a rotation drive mechanism, an image forming apparatus, and an image reading apparatus including the rotation stabilizing device.

Further, according to the image forming apparatus of the present invention, a rotating body provided with an image carrier for carrying an image formed by the image forming means, and an attenuating body having viscosity and elasticity with respect to the rotating body. And a vibrating body attached via
When the vibrating body vibrates, the rotational speed fluctuation of the rotating body is suppressed, and the attenuating body deforms according to the vibration of the vibrating body. Even when a vibrating force such as a fluctuation occurs, by vibrating the vibrating body, the rotation speed fluctuation is suppressed, and further according to the vibration of the vibrating body,
By deforming the viscous and elastic damping body, the speed fluctuation can be converted into heat and converged, thereby forming a high-quality image.
And since the arrangement position of the damping body having viscosity and elasticity can be arbitrarily changed in the radial direction, it can be adjusted in accordance with the frequency to be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view of a rotation stabilizing device according to an embodiment (a),
A perspective view of the rotating member (b), a perspective view of the inertial member (c), a perspective view of the coupling member (d), a sectional view of the rotation stabilizing device (e),
It is sectional drawing (f) of a rotating member, sectional drawing (g) of an inertia member, and sectional drawing (i) of a coupling member.

FIG. 2 is a perspective view of another rotation stabilizing device of the present embodiment (a), a perspective view of a rotating member (b), a perspective view of an inertial member (c), a perspective view of a mounting member (d), and viscoelasticity. Perspective view of members (e) Cross-sectional view of rotation stabilizing device (f), cross-sectional view of rotating member (g), cross-sectional view of inertial member (h), cross-sectional view of mounting member (i), and cross-sectional view of viscoelastic member (J).

FIG. 3 is a perspective view (a) and a sectional view (b) of still another rotation stabilizing device of the present embodiment.

FIG. 4 is a perspective view showing a modification of the viscoelastic member of FIG. 2 (e).

5A and 5B are a side view showing a rotary drive mechanism having a toothed pulley and a toothed belt of the present embodiment, and a side view showing another example.

FIG. 6A is a side view showing a rotary drive mechanism having a drive gear of the present embodiment, and FIG. 6B is a side view showing another example.
(C) and (d).

FIG. 7 is a diagram illustrating a part of a copying machine which is an image forming apparatus according to the embodiment;

8 is a partial cross-sectional view showing an enlarged part II of the configuration of FIG. 7;

9 is an enlarged view showing a part III of the configuration of FIG. 8;

10A is a diagram showing a transfer function of a drive system obtained by an experiment in the configuration of FIG. 1, in which a vertical axis indicates a transfer magnification and a horizontal axis indicates a frequency. It is. FIGS. 10 (b) and 10 (c) are diagrams showing changes in the speed unevenness of the photosensitive drum similarly obtained by experiments, in which the vertical axis shows the speed unevenness and the horizontal axis shows the frequency. .

FIG. 11 is a diagram illustrating a configuration of a transfer belt and its vicinity in the image forming apparatus of the present embodiment.

FIG. 12 is a diagram illustrating a rotation driving mechanism of the transfer belt of FIG. 11;

FIGS. 13A and 13B are a side view of the photosensitive drum and the cleaning unit in the image forming apparatus according to the present embodiment, and a plan view of the cleaning unit; FIGS.

FIG. 14 is a perspective view schematically showing the image reading apparatus of the present embodiment.

FIGS. 15A and 15B are diagrams for explaining a method of obtaining a natural frequency of an inertia portion (inertial member) in the present embodiment.

[Explanation of symbols]

Reference Signs List 1 photosensitive drum 2 drum shaft 3, 4 gear (gear) 5 flywheel (rotating member) 6 inertia portion (inertia member) 7 scraping blade 8 grommet (viscoelastic member) 9 screw (attachment member) 11, 21, 31 rotation Stabilizer 12 Rotating member 12a, 12c Plural holes 13 Inertial member 13a, 13c Plural holes 14 Coupling member 24, 24 'Viscoelastic member 25 Mounting member 41 Rotation stabilizing device 42 Motor 43 Motor rotating shaft 44 Toothed pulley 45 Tooth Attached belt 51.61, 71, 81 rotation stabilizing device 52 motor 53, 55 gear 54 motor rotating shaft 101 transfer belt 102 rotation driving roller 111, 112 gear 113 motor 114 motor rotating shaft 115 rotation stabilizing device 121 photosensitive drum 122 Cleaner unit 124 Fur brush 126 rotation Stabilizer 127 Drive pulley 127b Belt 131 Stepping motor 132 Timing belt 133 Drive pulley 136 Exposure unit (image reading means) 137 V mirror unit (image reading means)

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Taku Saito 2970 Ishikawacho, Hachioji-shi, Tokyo F-term in Konica Corporation (reference) 2H035 CA07 CB01 CG03 2H071 CA02 CA05 DA09 DA15 DA26

Claims (23)

[Claims] A rotating member that rotates about a rotation center axis; an inertia member disposed at a position different from the rotation member in an axial direction of the rotation center axis; and a viscoelastic member having viscosity and elasticity. A coupling member that detachably couples the rotating member and the inertial member via the viscoelastic member, wherein an attachment position of the coupling member can be adjusted to a position arbitrarily selected from a plurality of positions. A rotation stabilizing device, comprising: 2. The rotation stabilizing device according to claim 1, wherein the plurality of positions are a plurality of radial positions radially away from the rotation center axis. 3. The rotation stabilizing device according to claim 1, wherein the plurality of positions are a plurality of circumferential positions on a concentric circle of the rotation center axis. 4. The rotation stabilizing device according to claim 1, further comprising a rotating shaft fixed to the rotating member and rotating integrally with the rotating member. 5. The connecting member includes a mounting member for mounting the viscoelastic member to the rotating member and the inertial member, and a plurality of mounting members for mounting the viscoelastic member to one of the rotating member and the inertial member. 4. A hole is provided at said radial position and circumferential position.
Or the rotation stabilizer according to 4. 6. The rotation stabilizing device according to claim 5, wherein the mounting member includes a flange formed integrally with the viscoelastic member. 7. The rotation stabilizing device according to claim 5, wherein the mounting member is supported by a support provided on at least one of the rotating member and the inertia member. 8. The rotation stabilizing device according to claim 7, wherein the mounting member is screwed or fitted at the support portion. 9. The rotation stabilizing device according to claim 7, wherein the mounting member is inserted into a through hole provided in the viscoelastic member and is supported by the support portion. 10. The rotation stabilizing device according to claim 6, wherein the collar portion of the mounting member is sandwiched between the rotating member and the inertia member. 11. The rotation stabilizing device according to claim 1, wherein the rotating member has a disk shape. 12. The rotation stabilizing device according to claim 1, wherein the inertia member has a disk shape. 13. The rotation stabilizing device according to claim 11, wherein a diameter of the inertial member is larger than a diameter of the rotating member. 14. The viscoelastic member according to claim 1, wherein the viscoelastic member is made of a rubber material, and changes the rubber hardness of the rubber material at a radial position and a circumferential position where the coupling member is arranged. The rotation stabilizing device according to claim 1. 15. A rotating member that rotates about a rotation center axis, an inertia member disposed at a position different from the rotation member in an axial direction of the rotation center axis, and a viscoelastic member having viscosity and elasticity. A coupling member that detachably couples the rotating member and the inertial member via the viscoelastic member, wherein an attachment position of the coupling member can be adjusted to a position arbitrarily selected from a plurality of positions. A rotation drive mechanism, comprising: a rotation stabilizing device; a rotation drive unit; a rotation shaft that rotates with the rotation member by the rotation drive unit; and a rotation transmission mechanism connected to the rotation shaft. 16. The rotation stabilizing device according to claim 15, wherein the plurality of positions are a plurality of radial positions radially away from the rotation center axis. 17. The rotation stabilizing device according to claim 15, wherein the plurality of positions are a plurality of circumferential positions on a concentric circle of the rotation center axis. 18. The rotation stabilizing device further comprises a rotation stabilizing device-side rotation shaft fixed to the rotation member, rotated integrally with the rotation member, and connected to the rotation shaft. Item 18. The rotation drive mechanism according to Item 15, 16 or 17. 19. The apparatus according to claim 15, wherein the rotation driving means includes a rotation drum, and the rotation member of the rotation stabilizing device is formed integrally with the rotation drum.
The rotation drive mechanism according to 16 or 17. 20. The rotation transmission mechanism includes a toothed pulley connected to the rotation shaft, a toothed belt meshing with the toothed pulley, and a toothed pulley provided on a driven portion and meshing with the toothed belt. The rotation drive mechanism according to any one of claims 15 to 19, comprising: 21. The rotation transmission mechanism includes a first gear connected to the rotation shaft, and a second gear provided on a driven portion and meshing with the first gear. The rotation drive mechanism according to any one of claims 15 to 19. 22. An image forming apparatus, comprising: a rotation drive mechanism provided with the rotation stabilizing device according to claim 1. Description: 23. An image reading apparatus, comprising: a rotation drive mechanism including the rotation stabilizing device according to claim 1. Description: