Variable Load Ejection Roller for Inkjet Printers
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Solution Overview
Problem
Inkjet printers face challenges in maintaining paper quality during edgeless recording, as the driven roller tends to leave traces on the recording surface due to inadequate contact load, and increasing the contact load to prevent paper rising can exacerbate this issue.
Innovation Solution
A recording device with a controller-managed ejection unit featuring multiple roller pairs and load-switching capabilities, where the driven roller is urged by a higher load during recording and a lower load after completion to minimize contact traces while ensuring proper paper conveyance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the contact load of the driven roller is increased to prevent the rear end of the paper from rising upward during recording, then the conveying precision is improved, but the driven roller leaves traces of contact on the recording surface
Solution Approach 1:
The patent applies dynamics by making the contact load of the driven roller variable rather than fixed. The contact load is dynamically adjusted based on the recording stage: a first contact load is applied during recording to ensure conveying precision, and a second contact load (lower than the first) is applied after recording to prevent contact traces. This dynamic adjustment resolves the contradiction between maintaining conveying precision and preventing surface contamination.
2Object-generated harmful factors
If the contact load of the driven roller is reduced to prevent contact traces on the recording surface, then the recording quality is improved, but the conveying precision deteriorates due to insufficient nip force
Solution Approach 1:
The patent resolves this contradiction by dynamically adjusting the contact load according to the operational stage. During recording, a higher first contact load ensures adequate conveying precision. After recording completes, the contact load is reduced to a lower second contact load to prevent contact traces. This temporal separation of load levels satisfies both requirements at different times.
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 solution effectively prevents contact traces on the recording surface and maintains conveying precision by adjusting the load on the driven roller based on the recording stage, ensuring reliable ejection and high-quality output.
Implementation Method 1
a roller pair composed of a drive roller formed from rubber or another elastic material and a driven roller (a toothed roller) having teeth in the outer periphery
Data Source
AI summary
The recording device includes a recording unit, a conveying unit, an ejection unit, and a controller. The controller is configured to urge a driven roller of the ejection unit toward a drive roller of the ejection unit by a first load to eject a recording medium while the recording is performed on the recording medium of which a rear end has left the conveying unit, determine whether or not the recording is finished while the driven roller is urged toward the drive roller by the first load, switch the first load to a second load, which is less than the first load, to eject the recording medium on which the recording is finished in response to determining that the recording is finished, and urge the driven roller toward the drive roller by the second load while ejecting the recording medium on which the recording is finished.