JPH03287175A - Driving transmission mechanism for image forming device - Google Patents

Abstract

PURPOSE:To eliminate irregularities in the rotational speed of a photosensitive body and to obtain an image excellent in a quality by seperating a driving transmission gear attached to a driving motor into a gear for the photosensitive body and a gear for driving the other gears. CONSTITUTION:The driving transmission gear 15 engaged with a photosensitive body gear 4a and the driving transmission gear 16 engaged with the high-torque transmission gear 17 of a developing device, a fixing device, etc., are separated formed with different materials, and individually, held pivotally with the rotary shaft 13a of the driving motor 13. The drive transmission gear 15 is formed with the material having high elasticity and excellent vibration absorbability so as to be convenient to absorb the irregularities in the rotational speed of the photosensitivie body 4. On the other hand, the driving transmission gear 16 is formed with a rigid material capable of high-torque transmission to the developing device, the fixing device, etc. Thus, high-torque driving transmission is carried out by the driving transmission gear 16, and the driving transmission to absorb the vibration is carried out by the driving transmission gear 15, so that the irregularities in the rotational speed of the photosensitive body 4 are eliminated, and an excellent image can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a drive transmission mechanism for an electrophotographic image forming apparatus.

(Prior Art) As an example of the above-mentioned image forming apparatus, a laser printer has a configuration as shown in FIG. 2.

A paper feed cassette is removably loaded into this printer main body I2. The recording paper 2 fed from the paper feeding device 1 in the direction of arrow A is timed by a pair of registration rollers 3 and transported to a latent image carrier consisting of a photoreceptor 4 on a drum.

The photoreceptor 4 is rotationally driven in the counterclockwise direction;
1: The surface is charged by the electric charger 5, and is irradiated with laser light from the laser optical system 6 to form an electrostatic latent image on the photoreceptor. When this latent image passes through the developing device 7, it is made visible by toner.

This visible image is transferred to the photoreceptor 4 by a transfer/separation charger 8.
The image is transferred to the recording paper 2 that is conveyed to the recording paper 2, and the recording paper 2 that is in close contact with the photoreceptor 4 is electrostatically separated. Thereafter, the recording paper 2 is conveyed to a fixing device 9, where the visible image on the recording paper 2'' is fixed by the fixing device, and the recording paper 2 is discharged to a paper discharge section 10 in the direction of arrow I3.

On the other hand, the remaining 1-toner is removed from the photoreceptor 4 after the visible image has been transferred by a cleaning device 11 having a cleaning blade, and the removed 1-toner is collected by the cleaning device 12.

Further, by opening the second unit 12a of the printer main body, the upper side of the upper conveyance path of the recording paper 2 extending from arrows A to B can be opened, thereby making it possible to easily remove jammed paper, for example.

An example of a drive mechanism for the photoreceptor 4, etc. of the laser printer is shown in a perspective view of the main part in FIG. 3, and in FIG. 4, a front view of the main part as seen from the direction of arrow C.

The individual drive motor 13 drives all mechanical parts such as the photoreceptor 4, and the rotation IPI of the drive motor 13
1113a is a drive transmission gear 1 to the photoreceptor 4 and other mechanical parts.
4 (14a, ], 4b) are pivoted. This drive transmission gear 1/la meshes with a photoconductor gear 4a that is pivotally attached to the rotating shaft of the photoconductor 4, and the other drive transmission gears 14b are connected to, for example, the developing device 7. It meshes with the high torque transmission gear 7 that rotates the fixing device 9, etc., and the drive transmission gear 1.4 (
14a and 14b) were made of the same material.

(Problems to be Solved by the Invention) With the above configuration, the developing device 7. Since the driving torque of the fixing device 9 and the like is large, the material of the drive transmission gear 4b needs to be made of a material with high rigidity.

On the other hand, a developing roller 7a, a cleaning blade 1. ], a, etc., and the photoconductor gear 4a coaxial with the photoconductor and its drive transmission gear], 4a, etc. Vibration due to meshing etc. is transmitted to the photoconductor, resulting in uneven rotation speed of the photoconductor. There was an adverse effect that the image was distorted and the recording quality was low.

This is the drive transmission gear 1/+ (14a, ], 4b
) are integrally formed of a highly rigid material and require a high 1-herk drive transmission.7. This is because the main focus was on the fixing device 9, etc., and no consideration was given to suppressing vibrations on the photoreceptor.

SUMMARY OF THE INVENTION An object of the present invention is to provide a drive transmission mechanism that does not cause unevenness in rotational speed or image disturbance due to vibration of a photoreceptor, and does not reduce recording quality.

(Means for Solving the Problems) The present invention transmits the driving force of one drive motor in the main body of the image forming device to the photoreceptor through a gear in order to capture 1 target consecutively. As the photoreceptor rotates, charging, writing,
In an electrophotographic image forming apparatus that performs development, transfer, and cleaning and records images on recording paper, a gear for transmitting the driving force of the drive motor is a drive transmission gear for a photoreceptor formed of a vibration absorbing member. , and a drive transmission gear for mechanical parts other than the photoconductor formed of a high torque transmission member.

(Function) According to the present invention, the driving force of the drive motor to the photoreceptor is transmitted by a drive transmission gear that absorbs vibrations. As a result of using gears, high-quality recording can be obtained without uneven rotation or image disturbance caused by vibration of the photoreceptor when driving force is transmitted.

(Embodiment) FIG. 1 shows a front view of essential parts of an embodiment of the present invention, and as shown in the figure, a drive transmission gear 15 meshing with a photoreceptor gear 4a,
Developing device7. The drive transmission gears 16 that mesh with the high torque transmission gear 17 of the fixing device 9 and the like are each divided and made of different materials, and are each pivotally attached to the rotating shaft 1.3a of the drive motor 13.

2. The drive transmission gear 15 is made of a material with high elasticity and good vibration absorbing properties, which is convenient for absorbing unevenness in the rotational speed of the photoreceptor 4. Further, the drive transmission gear 16 is made of a rigid material capable of transmitting high torque to the developing device, the fixing device, and the like.

With this configuration, high-torque drive transmission is performed by the drive transmission gear 16, and drive transmission for vibration absorption is performed by the drive transmission gear 15, so that uneven rotational speed of the photoreceptor 4 can be eliminated and a good image can be obtained. I can do it.

(Effects of the Invention) As explained above, the present invention can reduce vibration caused by gear meshing by dividing the drive transmission gear attached to the drive motor into a gear for the photoreceptor and a gear for immediate movement. Vibrations caused by contact with rollers and cleaning members can be prevented. As a result, it is possible to eliminate unevenness in the rotational speed of the photoreceptor and produce high-quality images.

[Brief explanation of drawings]

Figure 2 is a front view of the main parts of an embodiment of the present invention, Figure 2 is a diagram showing the structure of the laser printer, and Figures 3 and 4 are the main parts of the drive mechanism for the photoreceptor etc. in Figure 2. FIG. 2 is a perspective view of the main part and a front view of the main part thereof as seen from the direction of arrow C. 4. Photoconductor, 4a...Photoconductor gear, ■3...
Drive motor, 13a...Rotating shaft, ]5°I6... Drive transmission gear, ]7 - High torque transmission gear.

Claims (1)

[Scope of Claims] The driving force of the drive motor in the main body of the image forming apparatus is transmitted to the photoreceptor through gears, and as the photoreceptor rotates, charging, writing, development, transfer, and cleaning are performed to record on recording paper. In an electrophotographic image forming apparatus, the gear for transmitting the driving force of the drive motor is a drive transmission gear for a photoconductor made of a vibration absorbing member, and a photoconductor other than a photoconductor made of a high torque transmission member. A drive transmission mechanism for an image forming apparatus, characterized in that the drive transmission mechanism is divided into a drive transmission gear for a mechanism section.