Folding Roller Pressing Mechanism for Sheet Wrinkle Prevention
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Solution Overview
Problem
Conventional sheet folding apparatuses face challenges in evenly pressing sheets due to uneven force distribution, leading to wrinkles, skew, and misalignment, as they lack counter forces near the central portion, resulting in reduced folding quality.
Innovation Solution
A sheet processing apparatus with first and second folding rollers that apply pressing force in the rotating shaft direction, ensuring even pressure distribution across the sheet by pressing the second folding roller against the first folding roller at a central portion, thereby counteracting repulsive forces and maintaining alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If pressing force is applied at both ends of the folding processing roller pair, then the repulsive force near the ends is countered, but the central portion lacks counter force causing roller bending and insufficient pressing
Solution Approach 1:
The patent applies pressing force at multiple specific locations (both ends and central portion) rather than uniformly across the roller pair. This local quality approach ensures that pressing force is applied precisely where repulsive forces occur during sheet folding, preventing roller bending and maintaining consistent sheet contact pressure for high folding quality
Solution Approach 2:
The pressing mechanism is divided into multiple independent pressing units that can apply force at different locations (ends and center) separately. This segmentation allows each pressing unit to independently counter repulsive forces at its specific location, ensuring comprehensive force distribution across the entire roller pair length
2Ease of operation
If pressing force acts only at both ends, then end portions are adequately pressed, but deviation of pressing force occurs between ends causing wrinkles and skew
Solution Approach 1:
The patent implements pressing units at both ends and in the central portion, each applying force locally to its specific region. This ensures uniform pressing force distribution across the entire sheet width, preventing wrinkles and skew while maintaining folding alignment, with each pressing unit operating independently in its designated zone
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 enables effective formation of a folding line and improves folding quality by ensuring even pressure across the sheet, preventing wrinkles and skew, and maintaining accurate alignment.
Implementation Method 1
the folding processing apparatus generates pressing force over the whole area in a direction perpendicular to a sheet conveyance direction by applying force for pressing the folding processing rollers against each other
Data Source
AI summary
A sheet processing apparatus that forms a folding line on a sheet includes first and second folding rollers that form a folding line on the sheet by rotating a bent sheet while pinching from sheet surfaces and a first pressing unit that presses the second folding roller against the first folding roller in an arbitrary portion in a rotating shaft direction of the second folding roller.