Inkjet Printer Paper Curl Correction Mechanism
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Solution Overview
Problem
Ink jet printers face challenges in correcting paper curling, especially when recording on both surfaces, as the direction of curling varies with ink amount, leading to inconsistent discharge issues.
Innovation Solution
A recording apparatus with a discharging mechanism that includes a rotation member pinching the paper and contact portions on both sides, which form undulated wavy shapes to counteract curling in any direction, ensuring proper discharge regardless of curling orientation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single curving member is used to correct paper curling, then the structure is simple, but it cannot correct curling in both directions (upward and downward) when ink amounts vary on double-surface printing
Solution Approach 1:
The single curving member is divided into two separate curving members: a first curving member for correcting upward curling and a second curving member for correcting downward curling. Each curving member is independently configured to handle specific curling directions, enabling the system to adapt to varying ink amounts on double-surface printed paper while maintaining manageable structural complexity
Solution Approach 2:
The curving members are configured to be movable or adjustable, allowing the system to dynamically switch between correcting upward and downward curling based on the actual paper condition. This dynamic capability enables versatile curling correction without requiring a complex fixed structure for all possible scenarios
2Productivity
If ink is ejected on both surfaces of paper, then complete double-surface recording is achieved, but curling directions become inconsistent and unpredictable
Solution Approach 1:
The curling correction system is segmented into direction-specific curving members, with the first curving member handling upward curling and the second curving member handling downward curling. This segmentation allows the system to reliably correct curling in either direction regardless of which surface received more ink, maintaining reliability while supporting productive double-surface recording
Solution Approach 2:
The system changes the operational parameter of the curving members based on the detected curling direction. By adjusting which curving member is activated (first for upward, second for downward), the system adapts to varying ink distribution patterns on double-surface printed paper, ensuring reliable correction across different printing conditions
3Device complexity
If the paper is discharged with curled shape, then the discharging mechanism is simple, but the paper is not appropriately discharged to the tray
Solution Approach 1:
The curving members are positioned to act on the paper before it reaches the discharge point, preliminarily correcting the curling in the appropriate direction. This preliminary action ensures that paper with curled shapes is straightened out before discharge, improving discharge accuracy without requiring complex modifications to the discharge mechanism itself
Data Source
AI summary
A recording apparatus is provided that includes a first operating portion which operates for the first regions at both outsides further than the discharging portion in the opening width direction of the discharged paper to be positioned on the lower side (first direction side) further than the pinched position which is pinched by the discharge driving roller and the discharge driven roller, in the recording surface intersecting direction (vertical direction) intersecting with surfaces which become the recording surface, and a second operating portion which operates for the second regions on each outside of the first region in the opening width direction of the discharged paper to be positioned on the upper side (second direction side) further than the first region.