Intermediate Transfer Belt Speed Control for Abnormal Discharge
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Solution Overview
Problem
Conventional electrophotographic image-forming apparatuses experience image defects due to abnormal discharges during calibration, particularly in low-temperature, low-humidity environments where the intermediate transfer member has a high resistance value, leading to inaccurate density measurements and color shifts.
Innovation Solution
The image-forming apparatus includes a control unit that adjusts the driving speed of the intermediate transfer belt based on ambient temperature detected by a temperature detection unit, reducing the transfer voltage to prevent abnormal discharges during calibration, thereby ensuring accurate density detection and correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If transfer voltage is applied to the transfer member during calibration, then toner image transfer to the intermediate transfer belt is achieved, but abnormal discharge occurs when the intermediate transfer member has high resistance value (low temperature, low humidity environment)
Solution Approach 1:
The patent changes the driving speed parameter of the intermediate transfer belt based on ambient temperature conditions. At low temperatures where the intermediate transfer member exhibits high resistance, the driving speed is reduced to prevent abnormal discharge during calibration, while maintaining normal operating speeds under favorable conditions.
2Productivity
If the intermediate transfer belt driving speed is maintained at normal speed in low-temperature environment, then productivity is maintained, but abnormal discharge occurs causing image defects
Solution Approach 1:
The patent implements dynamic speed control of the intermediate transfer belt, adjusting the driving speed based on detected ambient temperature conditions. The system transitions from fixed normal speed to variable speed operation, reducing speed only when low temperature conditions trigger high resistance in the intermediate transfer member.
Solution Approach 2:
The patent employs a temperature detection unit that provides feedback to the control unit about ambient temperature conditions. Based on this feedback, the control unit adjusts the intermediate transfer belt driving speed to prevent abnormal discharge while maintaining productivity under normal conditions.
3Reliability
If transfer voltage is reduced to prevent abnormal discharge, then image defects are suppressed, but transfer efficiency may be degraded
Solution Approach 1:
Instead of reducing transfer voltage which would compromise transfer efficiency, the patent changes the driving speed parameter of the intermediate transfer belt. This alternative parameter adjustment prevents abnormal discharge while maintaining optimal transfer voltage and efficiency under normal operating conditions.
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
This solution effectively suppresses image defects caused by abnormal discharges, allowing for highly accurate calibration results without degrading image quality, even in challenging environmental conditions.
Implementation Method 1
a temperature detection unit configured to detect an ambient temperature
Implementation Method 2
the intermediate transfer member sometimes has a high resistance value in a case where the intermediate transfer member is used for a long time or in a low-temperature, low-humidity environment
Implementation Method 3
a transfer member configured to transfer the toner image to the intermediate transfer belt, a transfer voltage application unit configured to apply a transfer voltage to the transfer member
Implementation Method 4
This can cause an abnormal discharge between a transfer member and a photosensitive drum when a transfer voltage is applied to the transfer member
Data Source
AI summary
An image-forming apparatus includes a photosensitive drum, a development member, an intermediate transfer belt, a transfer member, a transfer voltage, a density detection unit, a temperature detection unit, and a control unit. The development member forms a toner image on a surface of the photosensitive drum, which the transfer member transfers to the intermediate transfer belt. The density detection unit detects an information related to a density of the toner image transferred to the intermediate transfer belt. The control unit controls a driving speed of the intermediate transfer belt. In a detection operation in which the density detection unit detects the information related to the density of the toner image transferred to the intermediate transfer belt in a state where the transfer voltage is applied to the transfer member, the control unit controls the driving speed based on an ambient temperature detected by the temperature detection unit.