Sheet Processing Apparatus Deflection Correction
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Solution Overview
Problem
Conventional sheet processing apparatuses face challenges in accurately aligning creasing positions across sheets due to varying deflection amounts, which affects folding precision and leads to misalignment of sheet ends, especially when deflection is not properly corrected.
Innovation Solution
A sheet processing apparatus with a first and second conveying unit, detecting units, and a control unit that calculates deflection and adjusts conveyance to eliminate deflection by reversing the second conveying unit, ensuring accurate creasing position alignment across sheets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the sheet is conveyed without stopping to perform creasing work, then productivity is improved, but the creasing positions of respective sheets deviate from one another due to deflection
Solution Approach 1:
The system performs preliminary detection of sheet deflection using detection units before the sheet reaches the creasing position. The control unit calculates the deflection amount and adjusts the creasing position in advance, allowing continuous conveyance while maintaining precise creasing alignment.
Solution Approach 2:
Detection units monitor the actual position and deflection of sheets during conveyance, providing feedback to the control unit. The control unit uses this feedback to dynamically adjust the creasing position, ensuring accurate alignment despite variations in sheet deflection while maintaining continuous operation.
2Manufacturing precision
If the conveying roller is rotated in reverse to eliminate deflection, then creasing position alignment is improved, but the durability of conveying rollers deteriorates due to increased slip
Solution Approach 1:
The system replaces the mechanical approach of rotating conveying rollers in reverse with a positional adjustment approach. The control unit calculates deflection and directly adjusts the creasing position based on detection data, eliminating the need for reverse rotation and associated mechanical wear.
Solution Approach 2:
The control unit acts as an intermediary between detection units and the creasing mechanism. It processes detection data, calculates deflection, and determines the appropriate creasing position adjustment, replacing the need for mechanical reverse rotation of rollers.
3Manufacturing precision
If the sheet is stopped before reaching the folding unit to perform creasing work, then creasing position alignment is improved, but productivity deteriorates
Solution Approach 1:
The system performs preliminary detection and calculation of the required creasing position adjustment while the sheet is still in conveyance. The control unit determines the adjusted creasing position in advance, allowing the sheet to continue moving without interruption while maintaining precise creasing alignment.
Solution Approach 2:
The system transitions from a static stopping approach to a dynamic continuous conveyance approach. Detection units and the control unit operate in real-time during conveyance, dynamically adjusting the creasing position based on detected deflection while the sheet continues to move, eliminating the need for stopping.
Data Source
AI summary
A sheet processing apparatus includes: a folding processing unit that folds a sheet by reversely rotating a second conveying member in a condition in which the sheet is held by a first and the second conveying members; a calculating unit that calculates an amount of deflection of the sheet held by the first and second conveying members from timings at which the sheet is detected by first and second detecting units disposed upstream of the first conveying member and downstream of the second conveying member and a distance between disposed positions of the first and second detecting units; and a control unit that sets, from the calculated amount of deflection of the sheet, an amount of conveyance for the first conveying member in a direction opposite to a sheet conveying direction in a condition in which the sheet is held by the first and second conveying members.