JP2001136765A - Drive apparatus, equipment provided with the drive apparatus and image-forming apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drive device that further improves the rotational accuracy of a photoreceptor drum and shortage of torque, when driving the drum with a vibrating-type motor. SOLUTION: A vibrating-type motor 44 is coupled directly to a photoreceptor drum 5. A gear 46 is provided on the motor shaft 45 of the vibrating-type moor 44 and coupled to the gear 48 of an auxiliary motor 49 via a gear 47. The drive force of the auxiliary motor 49 is transmitted to the gear 48 via a torque limiter 51.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving device, a device provided with the driving device, and an image forming apparatus, and more particularly, to a high-precision rotation accuracy and a large torque for driving a photosensitive drum of an electrophotographic image forming apparatus. The present invention relates to a drive device using a vibration type motor that generates a high torque at a low speed as a drive source of a required drive unit.

[0002]

2. Description of the Related Art A driving source for driving a photosensitive drum provided in an image forming apparatus such as an electrophotographic copying machine or a printer is required to have a high rotational accuracy, for example, a vibration generating a high torque at a low speed. It has been proposed to use a type motor.

In this drive mechanism, a vibration type motor is directly connected to a rotating shaft of a photosensitive drum and driven. For example, JP-A-8-95327 and JP-A-9-19775.
No. 1 and Japanese Patent Application Laid-Open No. 9-197756.

Further, a conventional drive mechanism of an image forming apparatus such as a photosensitive drum which does not use a vibration type motor as a drive source motor uses an electromagnetic motor such as a DC motor as an auxiliary drive source and employs a main drive source as a main drive source. The photosensitive drum and the transfer drum are driven by a driving force of a DC motor or the like via a shaft joint, a belt, a gear, or the like, and it is difficult to perform high-precision rotation due to backlash of the drive system and elastic deformation.

In the above-mentioned conventional example, in order to overcome such a drawback, a vibration type motor is used as a drive source and a direct connection drive is shown in FIG.

In FIG. 11, four photosensitive drums are used.
A tandem type full-color image forming apparatus, which is a so-called 4-drum full-color copying machine, is shown.

In FIG. 1, a full-color image forming apparatus 3
0 indicates that when a document is placed on the automatic document feeder DF and a user presses a start button (not shown), a sheet S as a transfer material is fed from the cassette 1a or the cassette 1b. The sheet S waits at the registration roller 2 in order to take timing with the image forming unit. In the meantime, the original is conveyed onto the original placing table 3, scanned by the optical system 4 and read into the CCD. Here, the image is decomposed into components of a yellow image (Y), a magenta image (M), a cyan image (C), and a black image (Bk).

The laser beam is turned on and off for each component to form latent images on the photosensitive drums 5Y, 5M, 5C, and 5Bk as image carriers in the Y, M, C, and Bk image forming units. I do.

In the image forming section, photosensitive drums 5Y, 5M,
Primary chargers 6Y, 6M that uniformly charge 5C, 5Bk,
6C, 6Bk, a developing device 9 for developing a latent image into a visible image
Y, 9M, 9C, 9Bk, transfer chargers 7Y, 7M, 7C, 7Bk for transferring a visible image to the sheet S, and cleaning devices 8Y, 8M for removing residual toner on the photosensitive drums 5Y, 5M, 5C, 5Bk. , 8C, 8Bk, etc.

An endlessly rotating transfer belt 19 passing through the transfer positions of the Y, M, C, and Bk image forming units is provided. The transfer belt 19 is synchronized with the image.
Each color is transferred while being electrostatically attracted and transported on the top,
Images are sequentially formed on the sheet S in a superimposed manner.

The sheet S is then conveyed to a fixing device 10 where the toner image is melted and fixed, discharged out of the apparatus, and stacked on a tray 20.

When a double-sided image is formed, the sheet S
After the fixing process of the first side of the sheet S is completed by the fixing device 10, the sheet S is guided downward by the flapper 12 at the entrance of the both-sided conveyance path, is reversed by the reversing unit 15, passes through the conveyance path 32, and is placed on the intermediate tray 31. To be loaded. After replacing the original,
The sheet is fed again, sent to the image forming unit again, and after the image formation on the second side, is passed through the fixing device 10 and is stacked on the tray 20 outside the apparatus.

FIG. 8 shows an apparatus shown in FIG.
FIG. 3 is a diagram illustrating a configuration of a drive mechanism of a plurality of photosensitive drums 5 in more detail.

In FIG. 8, the photosensitive drum 5 has a drum shaft 3 supported by bearings 39b and 39a attached to a centering plate 36 attached to the main body side plate 34 and the main body side plate 35.
8 is supported coaxially via drum flanges 5a and 5b, and is integrally fixed to a drum shaft 38 by a stopper 37.

Further, a vibration type motor 44 is provided on the drum shaft extension of the drum shaft 38, and one of the output shafts 45 is connected to the drum shaft 38 via a coupling 40, and the other is a pulse generating motor. The plate 45b is fixed.
Further, a pulse detection unit 45c is fixed outside the vibration type motor main body, and forms an encoder unit together with the pulse generation unit 45b. The driving unit shown in FIG.
1 is provided for each photosensitive drum of the full-color image forming apparatus.

The basic structure of a vibration-type motor such as a vibration wave motor is that a vibration member that forms driving vibration on an elastic body by an electro-mechanical energy conversion element such as a piezoelectric element, and that a driving section of the vibration member is pressed into contact with the vibration member. A driving body (by applying an alternating signal having a different phase to the electro-mechanical energy conversion element) by applying an alternating signal such as an AC voltage to the electro-mechanical energy conversion element. For example, a driving vibration generated by combining a plurality of bending vibrations) is generated, and the driving vibration relatively moves the vibrating body and the contact body.

The vibrating body is fixed, and the contacting body is a moving body (rotating body), so that the rotation of the moving body is taken out and the photosensitive drums of each color are individually rotated. Since the vibration-type motor is controlled with high accuracy by an external control circuit unit (not shown) for each color, a high-quality full-color image can be formed.

[0018]

Generally, a driving source such as a photosensitive drum of an image forming apparatus as in the above-mentioned prior art is required to have a long durability of 2000 hours to 5000 hours or more. .

The durability of the vibration type motor depends on the durability of the friction surface. There is a Langevin type vibration motor (type in which the vibrating body is formed in a rod shape) as a vibration type motor having a relatively large output. However, since the contact area is small and the surface pressure per unit area is high, the above-mentioned durability time is satisfied. It is difficult.

As a vibration-type motor that satisfies the above-mentioned durability time, a ring-type vibration-type motor (a type in which a vibrating body is formed in a ring shape) that can provide a large contact area is advantageous.

A ring-type vibration type motor has already been commercialized according to the present application (for example, a product USR-60 or U.S.A.).
A-60) and can be easily obtained.

However, the torque generated by the above-mentioned ring type vibration type motor is only about several kgfcm at most.

In an image forming apparatus, usually, a plurality of types of paper are used, and since the process speeds are different from each other, it is necessary to adjust the rotation speed of the motor shaft from low to high according to the type of paper.

FIG. 9 shows the torque-rotational speed characteristics (TN characteristics) of the ring type vibration type motor. As shown in FIG. 9, the rotation speed of the motor exhibits a drooping characteristic as the torque increases.

When an attempt is made to achieve high-precision rotation using a vibration-type motor exhibiting such characteristics, the TN characteristic becomes substantially linear, that is, 3.5 × 10 ⁻² × 9.8 N · m [3.5 kgfcm] or less. Must be used within the shaded area. Figure 3.
In the region of 5 × 10 ^-2 × 9.8 N · m [3.5 kgfcm] or more, the rotation becomes unstable and the accuracy deteriorates, so that the region cannot be used for high-precision rotation.

FIG. 10 shows the fluctuation of the load torque of the motor shaft when such a vibration type motor is rotating at a constant speed while controlling the speed, and the torque which can be controlled with high precision by 3.5 ×
The relationship between the 10 ^-2 × 9.8 N · m [3.5 kgfcm] area (shaded area) is shown.

As shown in FIG. 10, the shaft load fluctuates with time, and it can be seen that there is not much room for the allowable value.

In a vibration type motor exhibiting such characteristics,
Since the generated torque is reduced on the high speed side and the margin for the load is reduced, the speed on the high speed side is limited.

Further, depending on the type of paper, the load required for transporting the paper is different, and a large shaft torque may be required in combination with the process speed. Further, the load on the drive system fluctuates due to a change in the environment in which the image forming apparatus is installed, and the load gradually increases due to the deterioration over time of the drive system, and the shaft load deviates from the shaded area shown in FIG. As a result, in the ring-type vibration type motor, there is a case where torque margin is lost, rotation accuracy is deteriorated, image quality is reduced, or the motor is stopped due to insufficient torque.

In the above-described image forming apparatus, the door of the apparatus may be opened during maintenance such as toner supply.

However, in such a device, since there is a high-voltage part inside, in order to prevent danger, when the door is opened, in order to prevent a person from touching the high-voltage part and receiving an electric shock, the moment the door is opened. In addition, the power supply must be turned off, and the rotation of the rotating parts of the drum and the transfer drive system must be stopped immediately to prevent danger to the operator.

However, in such a tandem type image forming apparatus, the number of photosensitive drums and each roller becomes very large, and the moment of inertia of the rotating portion becomes large. However, when it stopped, it took time to completely stop.

Further, the user is demanding a further increase in the speed, and even if the drive system and the process technology satisfy the increase in the speed,
Due to the increase in speed, it takes time to reach the target speed or to stop, so that there is a problem that the maximum speed is limited.

An object of the present invention is to further improve the rotational accuracy and torque when driving a driven body such as a photosensitive drum using a vibration type motor as a drive source, and to expand a drive range. It is an object of the present invention to provide a driving device, a device including the driving device, and an image forming apparatus.

[0035]

A first configuration of a driving apparatus for realizing the object of the present invention according to the present application comprises a vibration type motor for driving a driven body and the driven body via a driving force limiting means. And an auxiliary driving source for applying a driving force in at least one direction of increasing or decreasing the driving force.

[0036] A second configuration of the driving device for realizing the object of the invention according to the present application is the second configuration, wherein the driving force of the auxiliary driving source is increased or decreased in the driving force of the driven body. It has a switching means capable of switching in the direction.

A third configuration of the driving device for realizing the object of the present invention according to the present invention is any one of the above-described configurations, wherein a plurality of the driven members are provided, and each of the driven members has a main driving source as a main driving source. A vibration type motor is provided.

A fourth structure of the driving device for realizing the object of the invention according to the present application is any one of the above structures, wherein the vibration type motor is directly connected to the driven body.

According to a fifth aspect of the present invention, there is provided a driving device for connecting a plurality of driven members so as to collectively drive a plurality of driven members, and transmitting a driving force to the connecting device. A vibration type motor, and an auxiliary drive source for transmitting an auxiliary drive force to the connecting means, wherein a driving force of the auxiliary drive source is provided between the connection means and the auxiliary drive means by a predetermined drive force. Driving force limiting means for generating a slip is provided.

A sixth aspect of the driving device for realizing the object of the invention according to the present application is the fifth aspect, wherein the driving force of the auxiliary driving source is increased or decreased in the driving force of the driven body. The driving force is applied in at least one of the directions.

According to a seventh aspect of the present invention, a driving device for realizing the object of the present invention is the fifth configuration, wherein the driving force of the auxiliary driving source is increased or decreased in the driving force of the driven body. It has a switching means capable of switching in the direction.

According to an eighth aspect of the present invention, there is provided a driving device for achieving the object of the present invention, wherein the driving force limiting means is a mechanical torque limiter.

A ninth configuration of the driving device for realizing the object of the invention according to the present application is any of the above configurations, wherein the auxiliary driving source is an electromagnetic motor such as a DC motor or a pulse motor, or a vibration type motor, or It is a pneumatic device or a hydraulic device.

The first aspect of the driving apparatus for realizing the object of the present invention according to the present invention is any one of the above-described first to eighth aspects, wherein the auxiliary driving source is an electromagnetic motor such as a DC motor, a pulse motor, or the like. It is characterized by combining a plurality of vibration type motors, pneumatic devices, hydraulic devices and the like.

A device provided with a drive unit for realizing the object of the present invention according to the present application is characterized in that it has a drive unit of any one of the above-described configurations.

A first configuration of an image forming apparatus for realizing the object of the invention according to the present application includes the above-described driving device, and drives the driven body as a rotating member that rotates when forming an image. It is characterized by the following.

A second configuration of the image forming apparatus for realizing the object of the present invention is characterized in that the rotating member is a photosensitive member.

A third configuration of the image forming apparatus for realizing the object of the invention according to the present application is that the rotating member electrostatically holds and conveys the recording material toward a transfer position with the photosensitive member. It is characterized by being.

[0049]

Next, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a first embodiment of the present invention.

FIG. 1 is a schematic view showing a photosensitive drum driving unit of an image forming apparatus showing a characteristic portion of the present embodiment.

The driving unit of the present embodiment shown in FIG. 1 is different from the conventional configuration shown in FIG. 8 in that the driving force from the auxiliary driving source is transmitted through gears provided on the motor shaft of the vibration type motor. The point is that it is applied to the motor shaft of the vibration type motor. In FIG. 1, the same members as those shown in FIG. 8 are denoted by the same reference numerals, and description thereof will be omitted.

In FIG. 1, the photosensitive drum 5 has a drum shaft 3 supported by bearings 39b and 39a attached to a centering plate 36 attached to the main body side plate 34 and the main body side plate 35.
8 is supported coaxially via drum flanges 5a and 5b, and is integrally fixed to a drum shaft 38 by a stopper 37.

Further, a vibration type motor 44 is provided on an extension of the drum shaft of the drum shaft 38, and one of its output shafts 45 is connected to the drum shaft 38 via a coupling 40, and the other is a pulse generator The plate 45b is fixed.
Further, a pulse detection unit 45c is fixed outside the vibration type motor main body, and forms an encoder unit together with the pulse generation unit 45b.

A gear 46 is fixed to the motor shaft 45, and a mechanical torque limiter 5 is mounted on a motor shaft 50 of an auxiliary motor 49 which has a motor such as a DC motor as an auxiliary drive source.
1 is connected to a gear 48, and an auxiliary motor 49
Is transmitted to the gear 48 from the torque limiter 51.
Is limited by the sliding torque of

The gear 48 fixed to the motor shaft 50 of the auxiliary motor 49 is configured so that driving force is transmitted to the gear 46 via a gear 47 held on a support shaft (not shown) on a side plate (not shown). I have. The rotation speed of the motor shaft 50 of the auxiliary motor 49 can be changed by a control circuit (not shown).

The auxiliary motor 49 and the vibration type motor 44 as a main drive source are fixed to a side plate (not shown).

In the apparatus configured as described above, the rotation speed of the motor shaft 50 of the auxiliary motor 49 is calculated by comparing the rotation speed of the vibration type motor 44 as the main drive source with respect to the motor shaft 45 with respect to the rotation speed of the motor shaft 45. FIG. 2 shows an example of the shaft output characteristics (TN characteristics) of the output shaft 45 of the vibration type motor when the driving force is in the direction of increasing the driving force when the driving force is increased.
Shown in

In FIG. 2, TN shown by a two-dot chain line
The characteristics are TN characteristics in the case of only the vibration type motor (UA60), and are of course the same as the TN characteristics shown in FIG. The TN characteristic indicated by the solid line in FIG. 2 is obtained by adding a torque obtained by converting the slip torque of the torque limiter 51 to the motor shaft 45 of the vibration type motor 44. In this case, 3 × 10 ⁻² N · m [3 kgfcm]. Of course, here
Needless to say, the torque generated by the assist motor is 3 × 10 ⁻² N · m [3 kgfcm] or more when converted to the motor shaft 45.

Therefore, with the above configuration, the torque value that can be controlled with high precision increases to 6.5 × 10 ⁻² N · m [6.5 kgfcm].

The number of rotations of the auxiliary motor 49 may be roughly controlled within a range in which the shaft conversion number of the motor shaft 45 of the vibration motor 44 is always equal to or greater than the number of rotations of the photosensitive drum. The control circuit for the motor 49 and the auxiliary drive source (not shown) can be manufactured at low cost.

FIG. 3 shows the variation of the load torque of the motor shaft when the vibration type motor having the above configuration is rotating at a constant speed, and the 6.5 × 10 ⁻² N · m [6.5 kg
fcm] (shaded area).

As shown in FIG. 3, as the allowable value of the torque is increased, the margin with respect to the shaft torque actually generated in the shaft is increased, so that the torque can be changed over time and the torque can be increased due to an unexpected situation. In addition, it can be driven with a margin, and high-quality images can be guaranteed.

Further, since the torque margin on the high-speed side is increased, the speed can be further increased as compared with the conventional example.

Next, the rise and fall characteristics of the drive system using the vibration type motor according to the first embodiment at the time of start-up and stop are compared with those of the drive system in the case where the conventional assist motor is not used. 4 for comparison.

FIG. 4 (a) shows the start-up characteristics. The torque of the auxiliary drive source acts in the direction of increasing the shaft torque of the vibration type motor. Can be shortened. If t1 is a stop time when the torque of the auxiliary drive source acts in a direction to reduce the torque of the vibration type motor, and t2 is a stop time without the auxiliary drive source, t1 <t2.

Next, a description will be given of a case of a sudden stop.

The motor shaft 45 of the rotation speed of the auxiliary motor 49
Is smaller than the rotation speed of the motor shaft 45 of the vibration type motor 44,
Use as a brake.

FIG. 4 (b) shows the characteristics at the time of stop. The torque of the motor of the auxiliary drive source acts in the direction of decreasing the shaft torque of the vibration type motor, so that the stop time can be shortened because it acts as the braking torque.

If t1 is a stop time when the torque of the auxiliary drive source acts in a direction to reduce the torque of the vibration type motor, and t2 is a stop time when there is no auxiliary drive source,
t1 <t2.

(Second Embodiment) FIG. 5 shows a second embodiment.

In the above-described first embodiment, the torque transmission from the auxiliary motor 49 is performed via a gear train, whereas in the second embodiment, the torque is transmitted by a belt. It is composed.

In FIG. 5, a pulley 52 is fixed to a motor shaft 45 of a vibration type motor 44, a pulley 54 is connected to a motor shaft 50 of an auxiliary motor 49 via a torque limiter 51, and a belt 53 Pulley 5 through
2 and the pulley 54 are connected to apply a torque limited by the slip torque of the torque limiter 51 of the auxiliary motor 49 to the motor shaft 45 of the vibration type motor 44.

(Third Embodiment) FIGS. 6 and 7 show a third embodiment.

FIG. 6 is a side view of a drum drive system having a four-drum configuration, and FIG. 7 is a plan view.

In the third embodiment, a plurality of photosensitive drums are driven by one vibration motor and one auxiliary drive source.

In FIGS. 6 and 7, the photosensitive drums 5B, 5C, 5M, and 5Y as image carriers are supported by bearings 39b and 39a inserted into the side plates 34 and 36 by a drum shaft 38. Drums 5B, 5C, 5M, 5
A drive pulley 56 for rotationally driving Y is fixed to each drum shaft 38, and a pulley 54 fixed to the motor shaft 52 of the vibration type motor 44 and a motor shaft 50 of the auxiliary motor 49 via the torque limiter 51. An endless drive belt 57 is looped between the drive pulleys 56 of the respective photosensitive drums, and the drive pulleys 5 are required to transmit a rotational force between the drive pulleys 56 in order to obtain a sufficient transmission force.
An idler pulley 55 for ensuring a winding angle of the drive belt 57 with respect to the drive belt 6 is provided.

In the fourth embodiment, since the drum shaft is not directly driven by the vibrating motor as in the first and second embodiments, the rotational accuracy is somewhat inferior. By using a vibration type motor having a low speed and a high torque as a drive source, it is possible to realize much higher accuracy than when an electromagnetic motor such as a DC motor is used. The drum shaft can be driven with high precision.

With the configuration of the fourth embodiment described above, it is possible to provide a high-precision drive system which is far less expensive than the direct drive.

In the first to third embodiments of the present invention, the auxiliary drive source may be a vibration type motor or an electromagnetic motor such as a DC motor or a pulse motor. Further, other actuators, such as a pneumatic device and a hydraulic device, have the same configuration and can obtain the same effect. Further, these may be combined.

In the first to third embodiments of the present invention, the torque limiter is of a mechanical type. However, any means for limiting the torque may be used.
A current limiting circuit of a DC motor may be used.

[0082]

As described above, according to the present invention, the vibration-type motor is power-assisted by the auxiliary drive source, so that the vibration-type motor alone cannot be driven due to insufficient torque, or the vibration-type motor has high precision due to insufficient torque. It could be used for applications where rotation could not be guaranteed.

In the past, the upper limit of the rotation speed was limited because the torque was reduced in the high-speed range, but higher speeds have become possible.

Further, by employing the auxiliary drive source, rapid acceleration and rapid braking can be performed as compared with the conventional case, and the starting time and the stopping time can be shortened.

That is, according to the present invention, if the torque required for the drive source is not sufficient or insufficient for the vibration type motor, an assist motor is added to compensate for the torque, and the torque is insufficient. To make it possible to perform stable and high-precision rotation that is strong against load fluctuations.

In addition, by providing the driving force limiting means for limiting the torque assisted by the assist motor and transmitting only the torque, high-precision rotation of the vibration type motor can be ensured.

Further, the torque of the vibration type motor as the main drive source can be doubled and rapidly accelerated by using the assist motor, or the braking can be rapidly reduced by reducing the torque.

Further, by supplementing the torque of the vibration type motor, the application range of the vibration type motor can be expanded.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a photosensitive drum driving device according to a first embodiment of the present invention.

FIG. 2 is a diagram showing the total TN characteristics of the driving device of FIG. 1;

FIG. 3 is a diagram showing a margin between a shaft torque and a torque allowable value of the drive device of FIG. 1;

FIGS. 4A and 4B are diagrams showing a starting characteristic and a stopping characteristic of the driving device of FIG. 1;

FIG. 5 is a schematic diagram of a photosensitive drum driving device according to a second embodiment of the present invention.

FIG. 6 is a side view of a photosensitive drum driving device according to a third embodiment of the present invention.

FIG. 7 is a plan view of FIG. 6;

FIG. 8 is a schematic view of a conventional photosensitive drum driving device.

FIG. 9 is a diagram showing TN characteristics of the driving device of FIG. 8;

FIG. 10 is a diagram showing a margin between a shaft torque and an allowable torque value of the drive device of FIG. 8;

FIG. 11 is a schematic diagram of a full-color image forming apparatus.

[Explanation of symbols]

 5 Photosensitive drum 38 Drum shaft 44 Vibration type motor 45 Motor shaft 49 Auxiliary drive source 50 Motor shaft (of auxiliary drive source) 46, 47, 48 Gear 51 Torque limiter 53 Belt 52, 54 Pulley

Claims (14)

[Claims] 1. A vibration type motor for driving a driven body, and an auxiliary driving source for applying a driving force to the driven body in at least one direction of increasing or decreasing the driving force via the driving force limiting means. A driving device, comprising: 2. The driving device according to claim 1, further comprising switching means for switching a driving force of the auxiliary driving source in a direction of increasing or decreasing the driving force of the driven body. 3. The driving device according to claim 1, wherein a plurality of driven bodies are provided, and each driven body is provided with a vibration type motor as a main driving source. 4. The driving device according to claim 1, wherein the vibration type motor is directly connected to the driven body. 5. A connecting means connected to drive a plurality of driven bodies collectively, a vibration type motor transmitting a driving force to the connecting means, and an auxiliary driving force transmitting an auxiliary driving force to the connecting means. An auxiliary driving source; and a driving force limiting unit that generates a slip of the driving force of the auxiliary driving source with a predetermined driving force between the coupling unit and the auxiliary driving unit. apparatus. 6. The driving force of the auxiliary driving source is configured to apply a driving force in at least one direction of increasing or decreasing the driving force of the driven body. 6. The driving device according to 5. 7. The driving device according to claim 5, further comprising switching means for switching a driving force of the auxiliary driving source in a direction of increasing or decreasing the driving force of the driven body. 8. The driving device according to claim 1, wherein the driving force limiting unit is a mechanical torque limiter. 9. The apparatus according to claim 1, wherein the auxiliary driving source is an electromagnetic motor such as a DC motor or a pulse motor, a vibration type motor, a pneumatic device or a hydraulic device.
9. The driving device according to any one of items 1 to 8. 10. The auxiliary drive source according to claim 1, wherein a plurality of electromagnetic motors or vibration type motors such as a DC motor or a pulse motor, or a plurality of pneumatic devices or hydraulic devices are combined. A drive device according to one of the preceding claims. 11. A device comprising a driving device according to claim 1, wherein the driving device is provided with the driving device. 12. An image forming apparatus, comprising the driving device according to claim 1, wherein the driven member is driven as a rotating member that rotates when forming an image. 13. The image forming apparatus according to claim 12, wherein the rotating member is a photosensitive member. 14. The image forming apparatus according to claim 12, wherein the rotating member is a member that electrostatically holds and conveys the recording material toward a transfer position with the photosensitive member.