Sheet Folding Pressing Unit with Periodic Pressure Control
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Solution Overview
Problem
Conventional sheet processing techniques often result in curl or crease formation near the fold part due to twist accumulation during folding-enhancement, while also risking damage to the ends of the sheet bundle.
Innovation Solution
A sheet processing apparatus with a folding unit, a pressing unit that enhances the fold by pressing in the thickness direction, and a moving unit that advances and returns in the width direction, starting and stopping pressure at predetermined positions to minimize twist accumulation and prevent end damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the rollers move from one end to the other end of the back of the booklet continuously without pausing, then the folding-enhancement is completed efficiently, but the twist accumulates causing creases or curls at or near the fold part
Solution Approach 1:
The pressing unit performs periodic pressing actions with intermediate pauses during the folding-enhancement process. The control unit stops the pressing unit at predetermined positions during its movement across the sheet bundle, creating a periodic action pattern that prevents continuous twist accumulation while maintaining folding efficiency.
2Manufacturing precision
If the rollers press the back of the booklet from one end to the other end, then the fold is enhanced sufficiently, but the end of the booklet may be damaged
Solution Approach 1:
The pressing unit applies pressure locally to specific regions of the sheet bundle rather than continuously across the entire length. The control unit determines predetermined stopping positions based on the sheet bundle width, ensuring that pressing is concentrated on the fold area while avoiding excessive pressure on the ends.
3Manufacturing precision
If the pressing unit covers the entire width of the sheet bundle, then complete folding-enhancement is achieved, but the processing time increases
Solution Approach 1:
The pressing unit performs partial pressing actions at multiple predetermined positions across the sheet bundle width rather than a single continuous pass. The control unit divides the folding-enhancement task into multiple staged pressing operations, achieving complete coverage through cumulative effect while reducing time at each stage.
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 suppresses curl or crease formation near the fold part and prevents end damage during folding-enhancement by controlling the pressure application and movement of the folding-enhancement rollers.
Implementation Method 1
a pressing unit for pressing a fold part of the sheet bundle, which has been folded by the folding unit, in a thickness direction of the sheet bundle to enhance folding of the fold part
Data Source
AI summary
A sheet processing apparatus includes: a folding unit that folds a sheet bundle; a pressing unit that presses a fold part of the sheet bundle, which has been folded by the folding unit, in a thickness direction of the sheet bundle to enhance folding of the fold part; and a moving unit that advances and returns the pressing unit in a width direction of the sheet bundle. The pressing unit starts pressing from a predetermined position in the width direction of the sheet bundle during advancing movement, and releases pressing after going past one end of the sheet bundle. The pressing unit starts pressing from the predetermined position during return movement and goes past the other end of the sheet bundle.