Saddle Folding Blade Protrusion Prevents Sheet Slippage
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Solution Overview
Problem
The existing post-processing apparatuses for saddle-folding sheets often experience slippage between the blade and the sheet, leading to inaccurate insertion of the sheet's central portion into the nip portion, which can result in improper folding and stapling.
Innovation Solution
A blade with a protrusion portion at the leading edge, oriented in the pushing direction, is designed to increase contact surface pressure and prevent slippage by providing a larger contact resistance, ensuring accurate insertion of the sheet's central portion into the nip portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the blade pushes the sheet into the nip portion, then the central portion of the sheet is inserted for folding, but slippage occurs between the blade and the sheet leading to inaccurate positioning
Solution Approach 1:
The blade surface is modified with a protrusion pattern that creates localized high-friction zones. The protrusions are strategically positioned on the blade surface to generate increased contact resistance specifically at the interface with the sheet, preventing slippage while maintaining the overall blade structure and function.
Solution Approach 2:
The friction coefficient between the blade and sheet is changed by introducing a protrusion pattern on the blade surface. This structural modification increases the effective contact area and mechanical interlocking, thereby changing the friction parameter to prevent slippage during the pushing operation.
2Reliability
If a smooth blade surface is used, then the blade structure is simple, but slippage occurs between the blade and sheet
Solution Approach 1:
Instead of making the entire blade surface complex, only specific localized protrusions are added to the blade surface. This maintains simplicity in the overall blade structure while introducing friction-enhancing features only where contact with the sheet occurs, preventing slippage without excessive complexity.
3Force
If the blade pushes the sheet with high force, then the sheet is pushed into the nip portion, but slippage occurs due to insufficient friction
Solution Approach 1:
The friction parameter is enhanced by introducing a protrusion pattern on the blade surface. This increases the coefficient of friction between the blade and sheet, allowing the blade to exert pushing force without slippage, thereby maintaining reliable force transmission during the sheet insertion process.
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 blade effectively prevents slippage in both vertical and horizontal directions, allowing for precise folding and stapling by maintaining the push-in position of the sheet's central portion, thereby enhancing the accuracy and reliability of the saddle-folding process.
Implementation Method 1
a protrusion portion protruding in a pushing direction of the blade is provided at an edge of a folding side of the sheet in the blade
Data Source
AI summary
Disclosed is a blade for a saddle folding unit that can saddle-fold a sheet. At the edge of a folding side of the sheet in the blade, a protrusion portion protruding in a pushing direction of the blade is provided.