Liquid Jetting Head Cleaning via Two-Stage Wiping and Pre-Jetting
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Solution Overview
Problem
Existing liquid jetting devices experience an increase in jetting failures after using a napped wiping member to clean the nozzle surface, particularly when ink is likely to dry and solidify, as residual residues inside the nozzles cannot be effectively removed.
Innovation Solution
A liquid jetting head cleaning device that employs a two-stage cleaning process: first, a napped wiping member is used to clean the nozzle surface, followed by pre-jetting 10,000 times or more to dislodge residues, and then an unnapped wiping member is used for further cleaning with pre-jetting 200 times or less to ensure thorough removal of debris.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a napped wiping member is used to clean the nozzle surface, then the cleaning effect on the nozzle surface is improved, but the number of jetting failures increases due to residues being pushed into the nozzles
Solution Approach 1:
The wiping member is divided into two distinct sections: a napped wiping section for initial surface cleaning and an unnapped wiping section for final residue removal. This segmentation allows each section to perform its specific function optimally without interfering with the other, resolving the contradiction between surface cleaning effectiveness and jetting reliability.
Solution Approach 2:
The napped wiping section performs preliminary cleaning by removing loose residues from the nozzle surface before the unnapped wiping section performs the final cleaning. This preliminary action prevents large residues from being pushed into nozzles during the subsequent wiping process, thereby maintaining jetting reliability while achieving thorough cleaning.
2Productivity
If wiping is performed continuously without pre-jetting, then productivity is improved, but residues inside nozzles cannot be removed effectively
Solution Approach 1:
The cleaning process maintains continuity by performing pre-jetting, wiping, and post-jetting in a seamless sequence without interrupting the overall cleaning workflow. The liquid jetting system remains operational throughout, with brief pre-jetting and post-jetting phases integrated into the continuous cleaning cycle, thereby maintaining high productivity while ensuring thorough nozzle interior cleaning.
Solution Approach 2:
The liquid medium serves as an intermediary between the wiping member and the nozzle residues. During pre-jetting, the liquid helps loosen and flush out residues from the nozzle interior before wiping. During wiping, the liquid on the wiping member surface facilitates residue removal. This intermediary liquid action enables effective interior cleaning without disrupting the continuous productivity of the system.
3Reliability
If pre-jetting is performed 10,000 times or more after napped wiping, then residue removal is improved, but time consumption increases
Solution Approach 1:
Pre-jetting is performed 10,000 times or more immediately after napped wiping to flush out residues that may have been pushed into the nozzles during wiping. This preliminary action ensures thorough residue removal and restores nozzle functionality before the unnapped wiping section operates, preventing jetting failures while managing time consumption through efficient sequencing.
Solution Approach 2:
The cleaning system employs periodic action by alternating between high-frequency pre-jetting (10,000+ times) and the mechanical wiping action. This periodic alternation between fluid jetting and mechanical wiping creates an effective cleaning rhythm that removes residues thoroughly while optimizing the overall cleaning cycle time, balancing reliability improvement with time efficiency.
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 approach significantly reduces the number of jetting failures by effectively removing residual residues and preventing nozzle clogging, while minimizing mist adherence and maintaining nozzle performance.
Implementation Method 1
a liquid jetting head which jets the liquid from a nozzle disposed on the nozzle surface
Data Source
AI summary
Provided are a liquid jetting device, a liquid jetting head cleaning device, and a liquid jetting head cleaning method, in which an increase in the number of jetting failures is suppressed in a case where a nozzle surface of a liquid jetting head is cleaned by causing a napped wiping member to abut against the nozzle surface.The problem is solved by a liquid jetting head cleaning device, in which first cleaning is performed on a liquid jetting head by causing a napped wiping member to abut against a nozzle surface of the liquid jetting head, second cleaning is performed on the liquid jetting head by causing a liquid to be first pre-jetted from a nozzle of the liquid jetting head after the first cleaning and causing an unnapped wiping member to abut against the nozzle surface of the liquid jetting head after the first pre-jetting, the liquid is pre-jetted from the nozzle of the liquid jetting head after the second cleaning, and the number of times of jetting in the first pre-jetting is larger than the number of times of jetting in the second pre-jetting.