Dual Maintenance Unit Layout for Inkjet Nozzle Cleaning
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Solution Overview
Problem
Existing inkjet printing apparatuses face issues with ink drying, thickening, and ejection failures due to nozzle blockages caused by ink adhesion, paper dust, or air bubbles, requiring effective cleaning without increasing the apparatus size.
Innovation Solution
A maintenance mechanism with dual maintenance units, including a first and second cleaning unit positioned side by side in the transverse direction of the printing head, supported by a scanning mechanism to clean the nozzle surface effectively, utilizing cleaning liquids, wipers, and negative pressure to restore ejection performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional cleaning members are provided to improve cleaning power, then cleaning effectiveness is improved, but apparatus size increases
Solution Approach 1:
The patent transitions from a single cleaning unit to multiple cleaning units arranged in the transverse direction (width direction) of the printing head. This spatial reorganization allows additional cleaning members to be accommodated without extending the longitudinal size of the apparatus, effectively adding cleaning capacity in a different dimensional orientation.
Solution Approach 2:
The cleaning function is divided into multiple independent cleaning units, each with its own cleaning member. The first cleaning unit handles general cleaning tasks while the second cleaning unit addresses specific cleaning needs. This segmentation allows each unit to be optimized for its particular function while collectively providing comprehensive cleaning coverage without requiring a single large-scale cleaning mechanism.
2Reliability
If multiple cleaning units are arranged side by side in the transverse direction, then cleaning coverage is improved, but positioning complexity increases
Solution Approach 1:
Both the first and second cleaning units share common functional components including the support member for scanning movement, the positioning mechanism for transverse positioning, and the integration with the printing head maintenance system. This multi-functionality reduces overall system complexity despite having multiple cleaning units, as they utilize shared infrastructure rather than requiring completely separate systems.
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
The dual-unit maintenance mechanism ensures thorough cleaning of the printing head nozzles, preventing ejection failures and maintaining performance without enlarging the apparatus size, by alternating cleaning positions and using different wiper units and suction to address various types of nozzle blockages.
Implementation Method 1
a suction unit configured to move to a contact position with the nozzle formation surface and to perform suction with negative pressure
Data Source
AI summary
A maintenance mechanism includes a first maintenance unit provided with a plurality of cleaning mechanisms for cleaning a printing head configured to eject a liquid, a second maintenance unit disposed side by side with the first maintenance unit in a transverse direction of the printing head, a support member configured to support the first maintenance unit and the second maintenance unit so as to allow scanning in a longitudinal direction of the printing head, a first positioning member configured to position the printing head at a first cleaning position, and a second positioning member configured to position the printing head at a second cleaning position that is different from the first cleaning position in the transverse direction of the printing head.