KR20060024238A - Method for controlling velocity of a development roller according to environment - Google Patents

Abstract

A developing roller speed control method according to the environment is disclosed. The method includes recognizing an image forming environment of the image forming apparatus when power is applied to the image forming apparatus, detecting whether an image forming command is instructed, and image forming from the recognized image forming environment when the image forming instruction is instructed. Checking whether the mode is a double-sided image forming mode, and if the image forming mode is a double-sided image forming mode, driving the developing roller by varying the rotational speeds at the time of the front image development and the back image development. . Therefore, according to the present invention, by controlling the rotational speed of the development roller in accordance with the image forming environment of the image forming apparatus, such as whether the duplex printing mode or the number of prints, it is possible to increase the durability of the image forming apparatus while maintaining high quality images To form.

Description

Method for controlling velocity of a development roller according to environment

1 is a flowchart of an embodiment for explaining a developing roller speed control method according to the environment according to the present invention.

Figure 2 is a flow chart of another embodiment for explaining a developing roller speed control method according to the environment according to the present invention.

The present invention relates to an image forming apparatus such as a printer, a multifunction printer, and more particularly, to a developing roller speed control method according to an environment for adjusting a rotational speed of a developing roller, which is a component of an image forming apparatus, according to an environment.

Looking at the operation of the image forming apparatus, after charging the photosensitive drum with a charger, a latent image is formed on the photosensitive drum by exposure. The toner is supplied to the toner conveying body by the feed roller, and the latent image is developed on the photosensitive drum by the developing roller in the toner supplied by the toner conveying body. The developed toner is transferred to the paper by the transfer roller, and the printing paper fixed by the fixing unit is output to the outside of the image forming apparatus. The developing roller is arranged to face the photosensitive drum at regular intervals. The photosensitive drum and the developing roller rotate at a constant speed ratio. The toner layer of the developing roller is changed by the frictional charging characteristics of the toner under the influence of temperature and humidity depending on the surrounding environment. Therefore, if the amount of developing toner is too large, a phenomenon that the toner is scattered by static electricity after transfer and spreading easily occurs, and a good image cannot be obtained. On the contrary, if the amount of toner on the developing roller is too small, an appropriate image density cannot be obtained. do. However, since the rotational speed of the developing roller is fixed regardless of the surrounding environment of the image forming apparatus, particularly regardless of the double-side image forming mode or the number of times the developing roller is developed, As a result, it is difficult to control the image density, which makes it difficult to expect good quality image formation.

An object of the present invention is to provide a developing roller speed control method according to an environment of an image forming apparatus, such as whether a duplex printing mode or the number of prints.

In order to achieve the above object, the developing roller speed control method according to the environment according to the present invention, if power is applied to the image forming apparatus, recognizing the image forming environment of the image forming apparatus, detecting whether the image forming command is instructed Step, if an image forming command is instructed, checking whether the image forming mode is a double-sided image forming mode from the recognized image forming environment, and if the image forming mode is a double-sided image forming mode, rotation of the front image development and the rear image development And driving the developing roller at different speeds.

Hereinafter, a developing roller speed control method according to an environment according to the present invention will be described with reference to the accompanying drawings.

1 is a flowchart of an embodiment for explaining a developing roller speed control method according to the environment according to the present invention.

First, when power is applied to the image forming apparatus, the image forming environment of the image forming apparatus is recognized (step 10). There are various judgment elements in the image forming environment of the image forming apparatus. For example, it becomes an image forming environment in which temperature, humidity, the number of image forming sheets, and whether the image forming mode is double-sided can be recognized. When power is applied to the image forming apparatus, various sensors suitable for each characteristic recognize the image forming environment in order to recognize the image forming environment such as temperature, humidity, the number of image forming sheets, and whether the image forming mode is double-sided.

After the tenth step, it is detected whether an image forming command is indicated (step 12). The image forming command means that image forming is instructed by a user, for example, instructing a printing command in a printer.

If an image forming command is instructed, it is checked from the recognized image forming environment whether the image forming mode is a double-sided image forming mode (step 14). In the image forming environment recognized in the tenth step, it is checked whether the image forming mode is a duplex printing mode for forming image forming on both sides of the printing paper.

At this time, if the image forming mode is the double-sided image forming mode, the development roller is driven by varying the rotation speeds at the time of front image development and back image development (step 16). Unlike the related art, the image is developed by varying the rotational speed of the developing roller at the time of image development with respect to the front side of the printing paper and the rotational speed of the developing roller at the time of image shape with respect to the back side of the printing paper. That is, after developing the image on the front side of the printing paper and performing the printing process through the transfer and fixing process, the development roller is different from the rotational speed of the developing roller when developing the front side image on the back side returned by the double-sided image forming mode. The image is driven to develop an image, and the developed image is printed by transferring and fixing.

On the other hand, if the image forming mode is the single-side image forming mode, the rotational speed of the developing roller is driven to rotate faster than the predetermined speed by the predetermined speed or more than the rotational speed in the double-sided image forming mode (step 18). When the image forming mode is detected as the single-sided image forming mode for printing only one side of the printing paper, the rotational speed of the developing roller is driven to rotate faster than the rotational speed of the developing roller in the double-sided image forming mode. How fast to rotate is determined in consideration of the image quality of image formation.

Figure 2 is a flow chart of another embodiment for explaining a developing roller speed control method according to the environment according to the present invention.

First, when power is applied to the image forming apparatus, the image forming environment of the image forming apparatus is recognized (step 30). As described above, when power is applied to the image forming apparatus, in response to the power, various sensors suitable for each characteristic are used to recognize the image forming environment such as temperature, humidity, the number of image forming sheets, and whether the image forming mode is double-sided. Recognize.

After step 30, it is detected whether an image forming command is indicated (step 32). As described above, for example, when the image forming apparatus is a printer, it detects whether a print command is indicated by the user.

If an image forming command is instructed, the number of image forming sheets developed by the developing roller is detected from the recognized image forming environment (step 34).

The number of image forming sheets may be detected by the number of rotations of the developing roller or by counting the number of image forming dots. By checking the number of revolutions of the developing roller, the number of printed sheets of printing paper printed by the developing roller can be confirmed, and the number of printed sheets of the printed paper can be roughly confirmed by counting the number of totes for image formation.

After the thirty-fourth step, the developing roller is driven at different rotational speeds according to the detected number of image forming sheets (step 36).

In particular, the developing roller is driven by varying the rotational speed according to the temperature and humidity together with the detected number of image forming sheets. To this end, lookup table information as shown in Table 1 below is provided. However, such lookup table information is only an example.

TABLE 1

 Image formation Development roller rotation speed (ratio relative to photosensitive drum)                                          High temperature / high humidity Medium temperature / humidity Low / low humidity 0 to 500 [sheets]                                          1.25 1.25 1.20 501 ~ 100 [sheets]                                          1.20 1.15 1.10 1001 or more                                          1.15 1.10 1.05

Table 1 is information in the form of a look-up table provided for driving the developing roller at different rotational speeds according to temperature and humidity together with the detected number of image forming sheets. This information is used to drive the developing roller according to the image forming environment.

As can be seen from Table 1, each time the number of image forming sheets increases, it can be seen that the rotational speed of the developing roller is relatively reduced compared to the photosensitive drum. In addition, it can be seen that when the temperature and humidity are high temperature and high humidity, the rotational speed of the developing roller is relatively large as compared with the low temperature and low humidity.

As described above, by controlling the rotational speed of the developing roller according to the image forming environment of the image forming apparatus, such as the duplex printing mode or the number of prints, the image forming apparatus can be formed with high image quality while increasing the durability of the image forming apparatus. can do.

The development roller speed control method according to the present inventors environment has been described with reference to the embodiment shown in the drawings for clarity, but it is merely an example, and those skilled in the art may have various modifications and equivalents therefrom. It will be appreciated that other embodiments are possible. Therefore, the true technical protection scope of the present invention will be defined by the appended claims.

As described above, the development roller speed control method according to the environment according to the present invention is to be controlled by varying the rotational speed of the development roller according to the image forming environment of the image forming apparatus, such as whether the duplex printing mode or the number of prints In addition, it has the effect of forming a high-quality image while increasing the durability of the image forming apparatus.

Claims (5)

(a) recognizing an image forming environment of the image forming apparatus when power is applied to the image forming apparatus; (b) detecting whether an image forming command is indicated; (c) if the image forming command is instructed, checking whether an image forming mode is a double-sided image forming mode from the recognized image forming environment; And and (d) if the image forming mode is the double-sided image forming mode, driving the developing roller by varying the rotational speed between the front image development and the back image development. . The method of claim 1, wherein the developing roller speed control method according to the environment (e) if the image forming mode is the single-sided image forming mode, further comprising driving the rotational speed of the developing roller to rotate faster than a predetermined speed by the rotational speed in the double-sided image forming mode. Development roller speed control method according to. (a) recognizing an image forming environment of the image forming apparatus when power is applied to the image forming apparatus; (b) detecting whether an image forming command is indicated; (c) if the image forming command is instructed, detecting the number of image forming images developed by the developing roller from the recognized image forming environment; And and (d) driving the developing roller at different rotational speeds according to the detected number of image forming sheets. The method of claim 3, wherein step (c) And the image forming number of sheets is detected by the number of rotations of the developing roller or by counting the number of image forming dots. The method of claim 3, wherein step (d) And a developing roller speed control method according to an environment, wherein the developing roller is driven by varying a rotational speed according to temperature and humidity together with the detected number of image forming sheets.

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