Image forming apparatus

The gear train system with interlocking cams and clutches synchronizes developing rollers' timing in the image forming apparatus, addressing inconsistent pressing and separation issues, enhancing toner durability and apparatus compactness.

JP7868722B2Active Publication Date: 2026-06-02BROTHER KOGYO KK
View PDF 4 Cites 0 Cited by

Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
BROTHER KOGYO KK
Filing Date
2025-04-15
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Existing image forming apparatuses with multiple developing rollers struggle with inconsistent timing in pressing and separating these rollers against and from the photosensitive drum, leading to potential toner deterioration.

Method used

The apparatus employs a gear train system with interlocking cams and clutches to synchronize the timing of developing rollers, allowing them to press and separate at predetermined staggered intervals, using a color interlocking gear train and monochrome transmission gear trains to manage the phases and timings of the developing rollers.

Benefits of technology

This configuration ensures precise and synchronized operation of developing rollers, minimizing toner deterioration and enabling miniaturization of the apparatus while maintaining high printing quality.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure 0007868722000001
    Figure 0007868722000001
  • Figure 0007868722000002
    Figure 0007868722000002
  • Figure 0007868722000003
    Figure 0007868722000003
Patent Text Reader

Abstract

To bring first color, second color, and third color developing rollers into pressure contact or separate the developing rollers at pieces of predetermined timing shifted from each other.SOLUTION: An image forming apparatus comprises: a color interlocking gear train 110 that mechanically interlocks to rotate a first cam 90Y, a second cam 90M, and a third cam 90C, the color interlocking gear train 110 interlocking the cams 90 while maintaining a situation in which phases of the first cam 90Y, second cam 90M, and third cam 90C are shifted from each other; a monochrome transmission gear train 120K that transmits driving force of a motor M to a fourth cam 90K; a monochrome clutch 150K that switches whether to cause the monochrome transmission gear train 120K to transmit the driving force from the motor M to the fourth cam 90K; a color transmission gear train 120A that transmits the driving force of the motor M to the color interlocking gear train 110; and a color clutch 150A that switches whether to cause the color transmission gear train 120A to transmit the driving force from the motor M to the color interlocking gear train 110.SELECTED DRAWING: Figure 4
Need to check novelty before this filing date? Find Prior Art