Transfer Member Cleaning Control for Image Forming Apparatus
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Solution Overview
Problem
The back side of recording media can become contaminated due to toner adhering to the transfer member in image forming apparatuses, particularly when a toner image pattern not transferred to the recording medium passes through the transfer nip.
Innovation Solution
An image forming apparatus with a control unit that executes a cleaning operation to move extraneous matter from the transfer member to the image bearer before the recording medium enters the transfer nip, or causes a toner image pattern not transferred to the recording medium to pass through the transfer nip during a cleaning operation, ensuring the toner is removed from the transfer member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a toner image pattern passes through the transfer nip to be cleaned from the image bearer, then the image bearer is cleaned effectively, but the transfer member becomes contaminated with toner
Solution Approach 1:
The patent applies preliminary action by executing a cleaning operation on the transfer member before the recording medium enters the transfer nip. The control unit detects when a toner image pattern is present on the image bearer and proactively cleans the transfer member in advance, preventing toner contamination before it can occur during the transfer process.
2Reliability
If the transfer member is cleaned by moving extraneous matter to the image bearer, then the transfer member is cleaned, but toner may adhere to the back side of the recording medium
Solution Approach 1:
The patent executes the cleaning operation of the transfer member in advance before the recording medium enters the transfer nip. By detecting the presence of a toner image pattern and performing the cleaning operation proactively, the system ensures the transfer member is clean before the recording medium passes through, preventing toner from adhering to the back side of the recording medium.
Solution Approach 2:
The patent employs feedback control where the control unit detects whether a toner image pattern is present on the image bearer and bases the execution of the cleaning operation on this detection result. This feedback mechanism ensures the cleaning operation is performed at the appropriate time to prevent contamination while avoiding unnecessary cleaning that could cause back side contamination.
3Reliability
If cleaning operation is executed continuously, then the transfer member remains clean, but the recording medium may be contaminated during the cleaning process
Solution Approach 1:
The patent implements periodic action by executing the cleaning operation only at specific intervals when a toner image pattern is detected on the image bearer, rather than continuously. The control unit monitors the presence of toner patterns and triggers cleaning operations periodically based on actual needs, maintaining transfer member cleanliness while avoiding contamination of recording media during unnecessary cleaning cycles.
Data Source
AI summary
An image forming apparatus includes an image bearer, a transfer member, a cleaning member, and a control unit. The transfer member contacts the image bearer to form a transfer nip and transfer a toner image on the image bearer to a recording medium at the transfer nip. The cleaning member cleans a surface of the image bearer. The control unit executes a cleaning operation of moving an extraneous matter adhering to the transfer member to the image bearer to clean the transfer member. The control unit executes the cleaning operation after a toner image pattern that is not transferred to the recording medium passes through the transfer nip and before the recording medium enters the transfer nip.