Image Bearing Charge Control After Paper Jams
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Solution Overview
Problem
During paper jams in image forming devices, residual surface potential on the image bearing member leads to unnecessary consumption of carriers and developer imbalance, causing image contamination due to abnormal development.
Innovation Solution
An image forming device with a control unit that adjusts voltage application timing and operating states of the charging and developing members to eliminate residual charges, ensuring normal development by managing the electric and magnetic field relationships.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the charging voltage and developing voltage are stopped during paper jam, then the paper jam can be processed, but residual surface potential remains on the image bearing member causing carrier consumption and image contamination
Solution Approach 1:
The control unit applies voltage to the charge elimination member in advance before the image bearing member surface reaches the developing member position. This preliminary action ensures that residual charges are eliminated before they can cause carrier adsorption and image contamination, while still allowing the imaging process to resume after paper jam processing
Solution Approach 2:
A charge elimination member is introduced as an intermediary component between the charging member and developing member. This mediator applies voltage to eliminate residual charges on the image bearing member surface without interfering with the normal imaging process, preventing the harmful effect of carrier consumption while maintaining reliable paper jam processing
2Productivity
If the imaging process continues after paper jam processing, then productivity is maintained, but residual charges cause unnecessary carrier consumption
Solution Approach 1:
The control unit proactively applies voltage to the charge elimination member before residual charges can reach the developing member and cause carrier adsorption. This preliminary charge elimination allows the imaging process to continue without interruption while preventing carrier loss
Solution Approach 2:
The control unit monitors the imaging process state and automatically activates the charge elimination member when residual charges are detected or anticipated. This feedback mechanism ensures carrier protection is applied precisely when needed, maintaining productivity while preventing unnecessary carrier consumption
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Prevents unnecessary carrier consumption and image contamination by effectively managing residual charges, maintaining normal development operations post-paper jam.
Implementation Method 1
an image bearing member is charged by a charging element in the image forming device, such that the surface of the image bearing member is uniformly charged
Implementation Method 2
the surface of the image bearing member is irradiated by an exposure element, to form an electrostatic latent image
Implementation Method 3
toners are transported and attached to the electrostatic latent image by carriers in the developer (including the toners and the carriers), and a developed image is formed by applying a developing voltage
Implementation Method 4
a paper is overlapped with the developed image, and the developed image is transferred to the paper by the electrostatic voltage
Data Source
AI summary
An image forming device includes: an image bearing member to rotate; a charging member to charge a surface of the image bearing member; a developing member located in a rotation direction of the image bearing member and in downstream of the charging member along the rotation direction, and configured to supply developer to the image bearing member; a driving unit to drive the image bearing member, the charging member and the developing member to rotate; and a control unit, configured to adjust a control timing for applying a voltage to the charging member and the developing member, and control an operating state of the driving unit according to a current state of the image forming device, to eliminate charges in an area on the image bearing member between a position of the charging member and a position of the developing member.