Liquid Ejection Roller Pair Speed and Force Control
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Solution Overview
Problem
The existing liquid ejection apparatuses face challenges in stabilizing the conveyance of recording media when using a combination of roller pairs with different rotation speeds and conveyance forces, leading to potential skewing and damage risks due to the uneven distribution of conveyance forces.
Innovation Solution
The apparatus employs an upstream roller pair, a first downstream roller pair, and a second downstream roller pair, where the second downstream roller pair has a higher rotation speed and the first downstream roller pair has a larger conveyance force, with the conveyance force of the second downstream roller pair being largest at its central position, ensuring stable conveyance and preventing skewing by aligning the central positions of the rollers with the recording medium.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the conveyance force of the first downstream roller pair is made sufficiently larger than the second downstream roller pair, then stable conveyance is achieved, but the recording medium may be damaged due to excessive pressing by the spur roller
Solution Approach 1:
The patent changes the rotation speed parameter of the second downstream roller pair, making it higher than that of the first downstream roller pair. This parameter change allows the second roller pair to provide sufficient conveyance force without requiring the first roller pair to exert excessive pressing force, thereby resolving the contradiction between conveyance stability and damage prevention
Solution Approach 2:
The patent creates a dynamic conveyance system where the two downstream roller pairs operate at different rotation speeds, with the second roller pair rotating faster to provide the primary conveyance force. This dynamic configuration allows flexible adjustment of conveyance forces to maintain stability while preventing damage
2Ease of operation
If the conveyance force of the second downstream roller pair is made excessively small, then the first downstream roller pair can mainly convey the recording medium, but the recording medium slips between the rollers of the second downstream roller pair, causing conveyance failure
Solution Approach 1:
The patent optimizes the rotation speed parameter of the second downstream roller pair to be higher than that of the first downstream roller pair. This parameter adjustment ensures that the second roller pair maintains sufficient grip on the recording medium to prevent slipping, while still allowing the first roller pair to provide the primary conveyance force
3Productivity
If the rotation speed of the second downstream roller pair is made larger than the first downstream roller pair, then conveyance flexibility is improved, but the uneven distribution of conveyance forces causes skewing of the recording medium
Solution Approach 1:
The patent applies local quality by making the conveyance force of the second downstream roller pair largest at its central position. This localized concentration of conveyance force at the center ensures that even with different rotation speeds, the recording medium is conveyed uniformly without skewing, while still maintaining high conveyance speed
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 configuration ensures stable conveyance of the recording medium, preventing skewing and damage by optimizing the conveyance forces and rotation speeds across the roller pairs, allowing for reliable and high-quality recording.
Implementation Method 1
the upper roller and the lower roller being configured to give a conveyance force to the recording medium while the upper roller and the lower roller nip the recording medium therebetween, so as to convey the recording medium
Data Source
AI summary
A liquid ejection apparatus, including: a conveyor; and an ejector to eject a liquid; wherein each of an upstream roller pair, a first downstream roller pair, and a second downstream roller pair of the conveyor includes upper and lower rollers to respectively contact front and back surfaces of a recording medium, at least one of the upper and lower rollers being configured to give a conveyance force to the recording medium, wherein a rotation speed of the second downstream roller pair is higher than that of the first downstream roller pair, and the conveyance force of the first downstream roller pair is larger than that of the second downstream roller pair, and wherein the conveyance force of the second downstream roller pair is largest at a position thereof in the first direction which is nearest to the central position of the second downstream roller pair.