Sheet Cutting Conveying Speed Control for Slack Reduction
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Solution Overview
Problem
Conventional image forming apparatuses face challenges in efficiently managing conveying speed differences during sheet cutting processes, leading to inefficiencies and the need for enhanced performance and flexibility in handling varying sheet lengths.
Innovation Solution
A sheet cutting apparatus with multiple conveying units and a detecting unit that adjusts conveying speeds to quickly remove slack and accommodate varying sheet lengths, ensuring smooth cutting and conveying operations by synchronizing the motion of conveying roller pairs and cutters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the conveying unit halts during cutting to maintain precision, then cutting accuracy is improved, but slack accumulates in the sheet reducing efficiency
Solution Approach 1:
The conveying unit dynamically adjusts its operation between halting during cutting and rapidly conveying after cutting. The system transitions from a static halted state during cutting to a dynamic high-speed conveying state afterward, allowing the same conveying unit to serve both precision cutting and efficient slack removal purposes
2Productivity
If the conveying speed is increased to remove slack quickly, then productivity is improved, but cutting precision deteriorates due to motion
Solution Approach 1:
The conveying unit operates in periodic cycles: halting during cutting operations to ensure precision, then rapidly conveying to remove slack. This periodic alternation between stationary (for precision) and moving (for productivity) states resolves the contradiction between cutting accuracy and slack removal efficiency
3Adaptability or versatility
If the apparatus is designed to handle varying sheet lengths, then versatility is improved, but device complexity increases
Solution Approach 1:
The system handles varying sheet lengths by changing the conveying parameters (speed, distance, timing) rather than adding complex mechanical structures. The conveying unit adjusts its operational parameters based on sheet length requirements, maintaining versatility while avoiding increased device complexity
Data Source
AI summary
A sheet is cut between a first conveying unit and a second conveying unit in a state in which the first and second conveying units halt and in which an upstream conveying unit conveys the sheet at a first speed; after the sheet is cut, the first conveying unit conveys the sheet at a second speed higher than the first speed to reduce a slack formed during the halting; after the sheet is cut, the second conveying unit conveys the downstream-side sheet at a third speed higher than the first speed; if the third conveying unit is nipping the sheet during cutting, the third conveying unit conveys the sheet at the third speed; and if the third conveying unit is not nipping the sheet, the third conveying unit conveys the sheet at the third speed or a fourth speed after the detecting unit detects the sheet.