Printer Printhead Maintenance Control via Scanning Detection
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Solution Overview
Problem
Existing printing apparatus technologies face challenges in simultaneously reducing the frequency of printhead maintenance operations and preventing automatic activation during image scanning, which requires precise timing and operation pattern control to minimize interference with image scanning.
Innovation Solution
A printing apparatus with a scanning unit, printhead, maintenance unit, storage unit, timer, and control unit that determines and controls maintenance operations based on elapsed time and stored information, executing maintenance operations according to specific patterns to avoid interfering with scanning operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If periodic maintenance operations are performed based on elapsed time to extend printhead lifespan, then maintenance frequency is reduced, but maintenance operations may activate during image scanning causing vibrations and image quality deterioration
Solution Approach 1:
The control unit checks whether a scanning operation is in progress before executing a scheduled maintenance operation. If scanning is detected, the maintenance operation is postponed until after scanning completes. This preliminary check prevents maintenance operations from interfering with scanning, thereby avoiding vibrations that would deteriorate image quality while still maintaining the reduced maintenance frequency schedule.
Solution Approach 2:
The maintenance operation timing is made dynamic rather than fixed. The system continuously monitors the state of scanning operations and adjusts maintenance execution timing accordingly. When scanning is in progress, maintenance is delayed; when scanning is complete, maintenance proceeds. This dynamic adjustment resolves the contradiction between maintaining extended intervals and avoiding interference with scanning.
2Manufacturing precision
If maintenance operations are suppressed during image scanning to prevent vibrations, then image quality is maintained, but printhead maintenance may be delayed causing performance degradation
Solution Approach 1:
The system performs a preliminary check of scanning status before executing maintenance. This allows the system to proactively prevent maintenance operations during scanning, ensuring image quality is not compromised. The maintenance operation is scheduled in advance but its execution is conditionally delayed until scanning completes, thus maintaining both image quality and printhead performance.
Solution Approach 2:
The control unit continuously monitors the scanning operation status and uses this feedback to determine whether to execute or postpone maintenance operations. This feedback mechanism ensures that maintenance is automatically suppressed when scanning is in progress (protecting image quality) and automatically executed when scanning is complete (maintaining printhead performance).
Data Source
AI summary
A printing apparatus comprises: a maintenance unit that performs a maintenance operation for a printhead that includes a plurality of operation patterns; a storage unit that stores information indicating which of the operation patterns was performed when the maintenance operation was performed; a timer that measures an elapsed time from a previous printing operation; a determination unit that determines whether or not to execute the maintenance operation; and a control unit that controls the operation patterns of the maintenance operation to be performed in accordance with the elapsed time and the information, wherein in a case where a scanning instruction is received and the determination unit determines to execute the maintenance operation, the control unit performs control for executing the maintenance operation not in accordance with the elapsed time but in accordance with the information before the operation of scanning.