Printhead Wiper Unit With Negative Bend for Fast Roll Replacement
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Solution Overview
Problem
Existing printhead maintenance systems face inefficiencies in cleaning printhead nozzle plates due to the need for frequent replacement of wiper rolls and the potential for ink or contamination to interfere with nozzle operation.
Innovation Solution
A wiper unit with a compact design featuring a negative bend path for the wiper medium, a force pinch mechanism, and a locking mechanism for easy roll replacement, ensuring constant tension and efficient cleaning without roll displacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a roll of wiper medium is provided in a wiper unit for printhead maintenance, then cleaning effectiveness is improved, but the time and complexity of roll replacement increases
Solution Approach 1:
The wiper unit is divided into a housing containing a roll of wiper medium and a separate wiper element that contacts the printhead. This segmentation allows the wiper medium to be replaced independently without replacing the entire maintenance unit, reducing replacement time while maintaining cleaning effectiveness.
Solution Approach 2:
The wiper unit incorporates a force pinch mechanism with a spring element that dynamically adjusts the tension and contact pressure of the wiper medium against the printhead. This dynamic adjustment ensures consistent cleaning effectiveness throughout the wiper medium's lifespan and simplifies replacement by eliminating the need for precise tension adjustment during maintenance.
2Volume of moving object
If the wiper unit is designed with a compact embodiment using a negative bend path, then the device size is reduced, but the path complexity increases
Solution Approach 1:
The wiper medium path incorporates a negative bend that curves the medium in a compact arc within the housing. This curved path allows the wiper medium to traverse the necessary distance while maintaining a compact overall device size, effectively using spatial curvature to reduce the device's volume without significantly increasing mechanical complexity.
3Ease of operation
If the wiper medium path extends outside the housing for wetting and wiping sections, then maintenance operations are improved, but the housing design complexity increases
Solution Approach 1:
The wiper medium is extracted from the enclosed housing at specific sections to allow external wetting and wiping operations. The negative bend path strategically positions portions of the wiper medium outside the housing where wetting fluid can be applied and where the printhead can contact the wiper surface, enabling maintenance operations without requiring complex internal mechanisms within the housing.
Data Source
AI summary
A compact and efficiently loadable wiper unit for a maintenance unit of a printer is provided. The wiper unit includes a housing and a plurality of rollers, two rollers of which are configured for holding a roll of wound-up wiper medium, and wherein the remaining rollers define a path for transporting the wiper medium between said two rollers. The path defined by the remaining rollers includes a negative bend extending at least partially outside the housing.