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Image forming apparatus

An image and toner image technology, which is applied in the field of image forming devices, can solve the problems of complex motion control, change of transfer position, complexity, etc., achieve simple structure, improve the accuracy of transfer position, and save space

Inactive Publication Date: 2008-08-20
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] However, in the above-mentioned prior art, in the method of Patent Document 1, it is necessary to detect the eccentricity of the photosensitive drum to control the operation of each drive unit, and to use the same leading edge of the paper, and the operation control of each unit becomes complicated.
[0010] In addition, in the method of Patent Document 2, complicated control of correcting the timing of writing image data in accordance with the variation in the pitch of the main scanning lines is required.
[0011] In addition, according to the method of Patent Document 3, the influence of the eccentricity of the registration roller can be eliminated, but there is a problem that the transfer position fluctuates due to the eccentricity of the photosensitive drum.

Method used

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no. 1 approach

[0096] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0097] FIG. 1 is an explanatory view showing the overall structure of an image forming apparatus employing a paper conveying device according to the present invention, and FIG. 2 is a partial detailed view showing the structure of the main body of the image forming apparatus.

[0098] The image forming apparatus 1A of this embodiment outputs image data read by a scanner or the like or image data transmitted from the outside as a monochrome image by electrophotography and forms it on a predetermined sheet-shaped recording medium as a recording medium. paper (hereinafter referred to as paper).

[0099] The image forming apparatus 1A includes an image forming unit 14 , a developer (developing unit) 2 , a registration roller (recording medium transport unit) 15 , and a drive control unit (control unit) 62 (see FIG. 6 ).

[0100] The image forming unit 14 includes...

no. 2 approach

[0244] 1 to 3 and FIG. 7 are common drawings for the first and second embodiments, and description thereof will be omitted. In addition, the same structure as the structure of the said 1st Embodiment is attached|subjected with the same code|symbol, and the description is abbreviate|omitted.

[0245] 10 is an explanatory view showing a detection area detected by a phase sensor on the outer peripheral surface of the photosensitive drum according to the second embodiment.

[0246] On the outer peripheral surface of the photosensitive drum 3, as shown in FIG. Marked with M and barcode Mb. The region where the mark M and the barcode Mb are formed becomes a detection region.

[0247] Information on the photosensitive drum 3 is recorded in the barcode Mb, that is, the rotational phase of the photosensitive drum relative to the mark M (rotational phase information), the amount of eccentricity of the position corresponding to the rotational phase (eccentricity information), the posit...

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Abstract

The invention relates to an image forming apparatus including a photoreceptor drum, a developing roller, a registration roller for positioning and conveying the paper and a drive controller for controlling the drive of the registration roller. The registration roller conveys the paper so that its leading end collides with the photoreceptor drum. The drive controller corrects the timing of driving the registration roller based on the detected eccentric variation of the peripheral surface of the photoreceptor drum and the rotational phase. The drive controller may acquire the eccentric variation as external data instead of detecting it.

Description

technical field [0001] The present invention relates to an image forming apparatus, and more particularly, to an image output by forming a visualized toner image from an electrostatic latent image formed on a photosensitive drum, transferring the toner image to a conveyed recording medium forming device. Background technique [0002] Conventionally, in an image forming apparatus such as a printer using an electrophotographic method, a photosensitive drum that is rotationally driven is charged by a charger, and an electrostatic latent image is formed on the photosensitive drum by irradiation of light corresponding to image information. The toner adheres to the electrostatic latent image to form a toner image, and the toner image is transferred to a recording medium such as a sheet or paper to output the image. [0003] When transferring the toner image on the photosensitive drum to the paper, for example, the timing of paper transport is controlled by a registration roller a...

Claims

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Application Information

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IPC IPC(8): G03G15/00
Inventor 中泽进二米田泰治
Owner SHARP KK
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