Image forming apparatus

JP7874979B2Active Publication Date: 2026-06-17CANON KK
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
CANON KK
Filing Date
2022-03-01
Publication Date
2026-06-17

AI Technical Summary

Technical Problem

The configuration of existing developing devices, where screw blades are omitted or made smaller in diameter near the developer discharge port, leads to reduced stirring effect and unstable developer surface, making it difficult to discharge developer and increasing the risk of developer accumulation.

Method used

An image forming apparatus with a developing container divided into two chambers, using transport screws with controlled rotational speeds and blade configurations to stabilize the developer surface near the discharge port, and implementing a developer discharge acceleration operation during inter-paper periods to manage developer levels.

Benefits of technology

The solution effectively suppresses developer splashing and stabilizes the developer surface, preventing overflow while ensuring consistent developer supply to the developing sleeve, thereby maintaining image quality and preventing defects.

✦ Generated by Eureka AI based on patent content.

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Patent Text Reader

Abstract

To prevent a screw blade from splashing developer in an area facing a developer discharge port, and stabilize a developer surface in the area.SOLUTION: A developing device has a developer discharge unit for discharging a part of developer. When the number of recording materials on which image formation is executed reaches a predetermined number, a control unit controls a driving device so as to increase the rotation speed of a first conveying screw in a predetermined period from when execution of the image formation on a first recording material is completed until when the image formation on a second recording material subsequent to the first recording material is started, compared to the rotation speed of the first conveying screw while the image formation on the first recording material is executed.SELECTED DRAWING: Figure 13
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