Sheet Discharging Device Air Blower Clinging Prevention
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Solution Overview
Problem
Conventional sheet processing apparatuses face challenges in preventing sheet clinging and bending, particularly with coated paper, which affects alignment accuracy due to high surface smoothness, inter-sheet clinging force, and low Clark stiffness.
Innovation Solution
The implementation of a sheet discharging device that uses air blowers to reduce close contact between sheets by adjusting air velocity and direction based on paper type, thickness, and size, ensuring an air layer forms between sheets to prevent clinging and bending.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a retainer is used to hold ejected sheets at a normal position, then sheet stacking is improved, but thin sheets can be buckled by sheet clinging and conveyed in a state of clinging to a preceding sheet
Solution Approach 1:
The patent employs air blowers to deliver air to the sheet surface, creating an air layer that prevents sheets from clinging together. This pneumatic approach resolves the contradiction by using airflow to keep sheets separated during conveyance, preventing both stacking issues and bending of thin sheets.
Solution Approach 2:
The patent adjusts air delivery parameters (airflow rate, air delivery timing, air delivery position) based on sheet properties such as paper type, thickness, and size. By dynamically changing these parameters, the system optimizes prevention of sheet clinging while avoiding excessive air delivery that could cause sheet displacement or bending.
2Reliability
If air blowing is applied to prevent sheet clinging, then sheet conveyance is improved, but alignment accuracy may deteriorate due to sheet displacement
Solution Approach 1:
The patent applies air blowing locally to specific regions where sheet clinging is most likely to occur, rather than uniformly across the entire sheet. The air delivery position is strategically located to prevent clinging without causing sheet displacement that would affect alignment accuracy.
Solution Approach 2:
The patent dynamically adjusts air delivery parameters based on real-time sheet conditions and properties. The air blowing is applied only when and where needed, with parameters such as airflow rate and delivery timing being adjusted according to sheet type, thickness, and size, thereby preventing clinging while maintaining alignment accuracy.
3Reliability
If air delivery parameters are increased to prevent sheet clinging, then sheet separation is improved, but sheet displacement and bending may occur
Solution Approach 1:
The patent optimizes air delivery parameters (airflow rate, air delivery timing, air delivery position) based on sheet properties such as paper type, thickness, and size. By dynamically changing these parameters, the system achieves effective sheet separation while preventing excessive air delivery that would cause sheet displacement or bending.
Solution Approach 2:
The patent incorporates sheet detection to identify sheet properties and conditions, using this information to adjust air delivery parameters in real-time. This feedback mechanism ensures that air delivery is optimized for each specific sheet, preventing both clinging and excessive displacement or bending.
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 approach effectively prevents sheet clinging and bending, thereby enhancing alignment accuracy and stability during stacking.
Implementation Method 1
blowing air to a sheet at an air velocity that is set according to information about paper type, paper thickness, and sheet size when the sheet is ejected
Data Source
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AI summary
A sheet discharging device includes: sheet discharging rollers (6) that receive each of sheets (P) conveyed thereto and discharge the sheets (P) one by one; a shift tray (202) on which the sheets discharged by the sheet discharging rollers (6) are to be stacked; an air blower (400); and a CPU (101). The air blower (400) forms an air layer (AL) between the shift tray (202) and a sheet (P1) when the sheet (P1) is dischraged onto the shift tray (202) by the sheet discharging rollerls (6), or between a sheet (P2) and the sheet (P1) that is already placed on the shift tray (202) when the sheet (P2) is discharged. The CPU (101) controls an air velocity of air to be delivered by the air blower (400) based on sheet information, thereby causing the air layer (AL) to extend to the entire surface of the sheet (P1, P2).