Inclined Pushing Member for Sheet Stack Twist Correction
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Solution Overview
Problem
Existing sheet processing apparatuses face challenges in ensuring a flat edge cut and removing twisting in sheet stacks, leading to reduced quality of booklets due to insufficient orientation restriction and shaping during the center folding and stapling process.
Innovation Solution
A sheet processing apparatus with a sheet supporting table, a stopper, and a pushing member with an inclined surface that restricts the height of the folded part, correcting skew and twist by pressing the sheet stack against the stopper and supporting table, ensuring parallel alignment of edges before cutting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the sheet stack is pressed against a stopper to correct skew, then the edge alignment is improved, but the twisting of the sheet stack cannot be removed and the folding part height is not restricted
Solution Approach 1:
The pushing member is divided into multiple functional surfaces: a first surface (inclined at 45 degrees) that restricts the height of the folded part, and a second surface (vertical) that pushes the sheet stack against the stopper. This segmentation allows each surface to perform its specific function independently, resolving the contradiction between edge alignment and twist removal.
Solution Approach 2:
The pushing member introduces a new dimension of control by restricting the height of the folded part in the vertical direction (thickness direction of the sheet stack). This additional dimensional constraint works together with the horizontal pushing action to simultaneously achieve both edge alignment and twist removal.
2Stability of the object's composition
If pressure is applied to the sheet stack in the thickness direction, then the orientation is restricted, but the folding part height is not sufficiently controlled leading to non-flat edges
Solution Approach 1:
The first surface of the pushing member is specifically designed with a 45-degree inclination angle to locally restrict the height of the folded part. This localized quality control at the folding part ensures proper compression and flat edge formation, resolving the contradiction between orientation restriction and edge flatness.
3Device complexity
If a simple stopper is used for skew correction, then the device complexity is low, but the folding part height restriction and twist removal are insufficient
Solution Approach 1:
The pushing member is designed as a multi-functional component that combines both the height restriction function (first surface) and the pushing function (second surface). This universal component performs multiple tasks simultaneously, achieving high shaping quality without significantly increasing device complexity.
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 apparatus effectively corrects skew and twist in sheet stacks, resulting in high-quality booklet production with flat edges by ensuring proper orientation and alignment during the cutting process.
Implementation Method 1
a pushing member which pushes a second edge of the sheet stack which is a side of a folded part of the sheet stack so that the first edge of the sheet stack is pressed against the stopper, wherein the pushing member comprises a first surface which is inclined with respect to a sheet supporting surface of the sheet supporting table so that the first surface restricts a height of the folded part of the sheet stack with respect to the sheet supporting surface when the pushing member presses the sheet stack towards the stopper
Data Source
AI summary
A sheet processing apparatus including: a sheet supporting table that supports a sheet stack made of a plurality of sheets which have been folded; a stopper against which a first edge of the sheet stack which is a side to be cut of the sheet stack is pressed on the sheet supporting table; and a pushing member which pushes a second edge of the sheet stack so that the first edge is pressed against the stopper, wherein the pushing member comprises a first surface that is inclined with respect to a sheet supporting surface of the sheet supporting table so that the first surface restricts a height of the folded part of the sheet stack with respect to the sheet supporting surface when the pushing member presses the sheet stack towards the stopper.