Head Cleaning Device Speed Ratio Control for Ink Residue
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Solution Overview
Problem
The surface tension of the cleaning liquid in porous cleaning roller-based head cleaning devices changes with the number of ink head cleanings, affecting the wiping performance and leading to ink and cleaning liquid residue on the nozzle surface.
Innovation Solution
A head cleaning device with a porous cleaning roller, a storage tank, a unit moving mechanism, and a hardware processor that controls the rotation speed and moving speed of the cleaning unit based on the composition change of the cleaning liquid, adjusting the speed ratio to maintain stable wiping performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a porous cleaning roller is used with cleaning liquid, then the cleaning roller can absorb ink from the nozzle surface, but the surface tension of the cleaning liquid changes over time causing remaining ink and cleaning liquid on the nozzle surface
Solution Approach 1:
The control unit receives information about the number of cleaning operations and adjusts the rotation speed and moving speed based on this feedback. As cleaning operations increase and cleaning liquid composition changes, the system dynamically modifies operational parameters to compensate for surface tension changes, preventing ink and cleaning liquid residue on the nozzle surface.
Solution Approach 2:
The system transitions from fixed speeds to dynamically adjustable speeds. The rotation speed of the cleaning roller and the moving speed of the cleaning unit are no longer constant but are adjusted in real-time based on the number of cleaning operations, allowing the system to adapt to changing cleaning liquid properties.
2Ease of operation
If the cleaning roller rotates at constant speed and moves at constant speed, then the operation is simple, but the wiping performance deteriorates as cleaning liquid composition changes
Solution Approach 1:
The system implements dynamic speed adjustment where both the rotation speed of the cleaning roller and the moving speed of the cleaning unit are modified based on the number of cleaning operations. This maintains relatively simple operation while significantly improving wiping performance by adapting to changing cleaning liquid composition.
3Reliability
If the rotation speed and moving speed are adjusted based on cleaning liquid composition change, then the wiping performance is maintained, but the device complexity increases
Solution Approach 1:
The control unit uses feedback about the number of cleaning operations to automatically adjust speeds. This feedback mechanism maintains consistent wiping performance without requiring complex manual intervention or sophisticated sensors, as the adjustment is based on easily trackable operational count data.
Solution Approach 2:
The system performs self-adjustment based on internally tracked cleaning operation counts. The control unit automatically modifies rotation and moving speeds without external intervention, maintaining optimal wiping performance while minimizing the need for additional complex control infrastructure.
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 device effectively prevents the remaining of cleaning liquid on the nozzle surface, maintaining stable wiping performance over time by adjusting the speed ratio in response to changes in the cleaning liquid composition.
Implementation Method 1
In such a porous cleaning roller, the ink moved to the outer circumferential surface side of the cleaning roller is absorbed together with the cleaning liquid into a hole formed on the outer circumferential surface side of the cleaning roller.
Implementation Method 2
a cylindrical side circumferential surface is in pressure contact with a nozzle surface of an ink head to clean the nozzle surface
Data Source
AI summary
A head cleaning device includes: a porous cleaning roller that rotates around a cylindrical axis while a cylindrical side circumferential surface is in pressure contact with a nozzle surface of an ink head to clean the nozzle surface; a storage tank that immerses a lower part of the cleaning roller in a cleaning liquid stored therein; a unit moving mechanism that moves a cleaning unit including the storage tank and the cleaning roller in a direction perpendicular to the axis of the cleaning roller; a hardware processor that controls a rotation speed [vr] of the cleaning roller and a moving speed [vx] of the storage tank and the cleaning unit; and a composition acquisition part that acquires a change in composition of the cleaning liquid in the storage tank due to mixing of ink supplied from the nozzle surface through the cleaning roller.