Unlock instant, AI-driven research and patent intelligence for your innovation.

Image forming apparatus

a technology of forming apparatus and forming blade, which is applied in the direction of electrographic process apparatus, instruments, optics, etc., can solve the problems of affecting the quality of the image, and the blade may curl up, so as to achieve the effect of effective use of the toner consumed

Inactive Publication Date: 2014-03-04
CANON KK
View PDF9 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0009]The present invention allows effective use of the toner consumed in the toner discharge as, for example, the toner image involved in the color deviation detection.

Problems solved by technology

If the image forming (printing) is not performed for a certain period while the accumulated toner is left on the developing roller part, an adhesive force of toner may rise to cause toner fusion with respect to the developing roller and generate a defect image with lines caused by fixed toner in a toner-fused part.
Further, in a case where printing continues at a low printing ratio, a case where printing continues with small-size paper, a case where printing continues at high temperature and humidity, and other such cases, a cleaning blade for the photosensitive drum raises the following problems.
That is, the cleaning blade may curl up, an edge portion of the cleaning blade may chip, or the cleaning blade may chatter (cause stick-slip).
If curling up, the cleaning blade becomes unable to clean, and if the edge portion chips or chatters, toner runs through.
However, from the viewpoint of effective use of a toner resource, the toner consumed in the toner discharge does not play an original role of being formed as an image.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

first embodiment

[0023](First Embodiment)

[0024](Overall Construction)

[0025]A first embodiment is described by taking a color electrophotographic image forming apparatus as an example. FIG. 1A is referenced to describe an outline of an overall construction of the color electrophotographic image forming apparatus. An image forming apparatus described in this embodiment is a laser printer using an electrophotographic image forming process. A color image forming apparatus (hereinafter, referred to as “apparatus main body”) illustrated in FIG. 1A includes process stations (process cartridges) (image forming sections) 5Y, 5M, 5C, and 5K that are detachably attachable to the apparatus main body. The four process stations 5Y, 5M, 5C, and 5K have the same structure, but are different from one another in that images are formed by using toner (developer) in different colors, that is, yellow (Y), magenta (M), cyan (C), and black (K). Note that the symbols YMCK are omitted hereinbelow except when a specific proc...

second embodiment

[0065](Second Embodiment)

[0066]A construction of an image forming apparatus according to a second embodiment and a schematic configuration of a control system thereof are the same as those of the first embodiment. Therefore, description thereof is omitted, and the following description is made by using the same reference symbols. The first embodiment describes the case where the focus is placed on the cycle unevenness of the photosensitive drum 1. However, the actual image forming apparatus may be affected by the cycle unevenness of the drive roller 9 (second rotary member) in addition to the photosensitive drum 1 (first rotary member) as the cycle unevenness that affects the color deviation detection results. In this embodiment, a construction and configuration that can also cancel the cycle unevenness of the drive roller 9 is proposed. Note that, the present invention is not limited to the photosensitive drum 1 and the drive roller 9 as the cycle unevennesses of interest, and the ...

third embodiment

[0079](Third Embodiment)

[0080]A construction of an image forming apparatus according to a third embodiment of the present invention and a schematic configuration of a control system thereof are the same as those of the first embodiment. Therefore, description thereof is omitted, and the description is made by using the same reference symbols. The second embodiment describes the construction and configuration that enable the color deviation to be detected during the discharge control with more accurately with the addition of the discharge toner and the fine patch. However, more toner is consumed than in normal discharge control due to the addition of the fine patch for the above-mentioned purpose. This embodiment describes a construction and configuration that can cancel the cycle unevennesses of the photosensitive drum 1 and the drive roller 9 while keeping the consumption amount of toner to a lower level than in the discharge control.

[0081](Discharge Toner Patch)

[0082]In this embod...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The image forming apparatus includes a discharge execution section for forcedly discharging toner from a developing device and forming a toner image on a photosensitive drum, in which a primary transfer roller transfers the toner image formed on the photosensitive drum by the discharge execution section by applying, to a predetermined area part of the toner image, a first transfer bias having a predetermined transfer efficiency with respect to an intermediate transfer belt and applying, to a part excluding the predetermined area part of the toner image, a second transfer bias whose transfer efficiency is at least smaller than the predetermined transfer efficiency of the first transfer bias.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to an image forming apparatus that uses an electrophotographic recording process, such as a laser printer, a copier, or a facsimile machine.[0003]2. Description of the Related Art[0004]Conventionally, toner discharge is known as a technology for electrophotographic image forming apparatuses. The toner discharge is, for example, an operation for forcedly discharging toner from a developing device on a regular basis and supplying the discharged toner to a cleaning blade for a photosensitive drum. The toner discharge needs to be executed from a developing roller for the following reason. That is, in a case of printing a large number of images having a low printing ratio, toner supplied from a toner container to a developing roller position remains within the developing device without being transferred, and degraded toner accumulates on a developing roller part. If the image forming (printing) ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(United States)
IPC IPC(8): G03G15/08G03G15/16G03G15/01
Inventor ENDOH, KEISUKE
Owner CANON KK