Post-processing Device Paper Alignment Control
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Solution Overview
Problem
Conventional post-processing devices face challenges in maintaining accurate alignment of lightweight paper sheets due to variations in distribution on the paper receiving tray, leading to inaccurate post-processing results.
Innovation Solution
A post-processing device with a control section that adjusts the timing of the upper rotary body's descending motion to reduce the impetus of lightweight paper sheets by initiating contact before they reach the paper receiving tray, thereby minimizing sliding and bouncing and maintaining alignment on the processing tray.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the upper paper discharge roller contacts the paper after it reaches the paper receiving tray, then heavy paper sheets are properly positioned, but lightweight paper sheets scatter and bounce causing poor alignment
Solution Approach 1:
The upper paper discharge roller is made to contact the paper sheet before it reaches the paper receiving tray, rather than after. This preliminary action suppresses the impetus of lightweight paper sheets during conveyance, preventing scattering and bouncing, thereby improving alignment accuracy for all paper types without requiring separate handling mechanisms.
Solution Approach 2:
The timing parameter of the upper paper discharge roller's contact point is changed from post-tray-contact to pre-tray-contact. This parameter modification allows the system to handle both heavy and lightweight paper sheets effectively, as the earlier contact suppresses impetus before the paper reaches the tray, preventing the scattering issue that plagues lightweight papers while maintaining proper handling for heavier papers.
2Manufacturing precision
If the upper paper discharge roller contacts the paper early, then lightweight paper alignment improves, but the paper may not reach the processing tray correctly
Solution Approach 1:
The upper paper discharge roller is configured to rotate in both forward and reverse directions. When contacting lightweight paper sheets early to suppress impetus, it can rotate in reverse to pull the paper back if necessary, ensuring reliable delivery to the processing tray. This dynamic bidirectional rotation capability allows the system to maintain both alignment accuracy and delivery reliability across different paper types.
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 configuration effectively reduces the variation in paper distribution on the receiving tray, enhancing the alignment and accuracy of post-processing for lightweight paper sheets.
Implementation Method 1
causes the upper rotary body to start the descending motion with the timing such that the upper rotary body comes into contact with the paper before the paper comes into contact with the paper receiving tray
Data Source
AI summary
A post-processing device includes an introductory conveying path, a processing tray, a paper receiving tray, an upper paper discharge roller, a lower paper discharge roller and a control section. The upper paper discharge roller and the lower paper discharge roller are disposed at an edge portion on the paper receiving tray's side of the processing tray. The upper paper discharge roller is capable of coming into contact with and away from the lower paper discharge roller. The control section causes the upper paper discharge roller to start a descending motion with a timing such that the upper paper discharge roller comes into contact with paper before the paper comes into contact with the paper receiving tray if the paper belongs to a second kind, where the paper of the second kind is lighter weight than that of a first kind.