Humidity-Adaptive Vacuum Sheet Feeding for Image Forming Apparatus
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Solution Overview
Problem
Image forming apparatuses face challenges in separating individual paper sheets from stacks under high humidity conditions, leading to increased likelihood of overlapping sheet feed, especially with longer paper sheets.
Innovation Solution
The apparatus includes a humidity sensor and processor that lengthen the separation operation time by adjusting the sheet feeding time intervals based on humidity levels, using a vacuum sheet feed method to reduce stickiness and prevent overlapping feeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If sheet feeding is performed at constant feeding time intervals regardless of humidity, then productivity is maintained, but overlapping sheet feed occurs more frequently under high humidity conditions
Solution Approach 1:
The sheet feeding time interval is dynamically adjusted based on detected humidity levels. When high humidity is detected, the separation operation time is automatically extended to prevent overlapping sheet feed. This dynamic adaptation resolves the contradiction by allowing faster feeding when conditions permit while ensuring reliable separation when humidity creates sticking risks.
Solution Approach 2:
The patent changes the temporal parameter (separation operation time) based on environmental conditions (humidity). By extending the separation time specifically under high humidity conditions, the system maintains productivity at acceptable levels while preventing overlapping feeds. This parameter adjustment directly addresses the reliability issue without completely sacrificing productivity.
2Reliability
If separation operation time is extended under high humidity conditions, then overlapping sheet feed is reduced, but sheet feeding productivity decreases
Solution Approach 1:
The system dynamically adjusts separation time only when high humidity is detected, rather than extending it continuously. This allows the system to maintain high productivity during normal conditions while temporarily extending separation time only when reliability becomes compromised by humidity, thus resolving the contradiction between speed and reliability.
Solution Approach 2:
The separation operation time is periodically adjusted based on humidity detection cycles. The system monitors humidity conditions and applies extended separation intervals selectively during high humidity periods, allowing normal high-speed operation during low humidity periods. This periodic adaptation balances productivity and reliability requirements.
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 reduces the possibility of overlapping sheet feeds by extending the separation operation time under high humidity conditions, ensuring reliable and efficient feeding of individual sheets.
Implementation Method 1
a vacuum sheet feed unit that sucks and feeds the sheet
Data Source
AI summary
An image forming apparatus includes a memory and a processor configured to, when humidity detected by a humidity sensor is equal to or above a preset value with paper sheets stacked in a paper sheet holder being fed to an image forming unit, perform control to set a separation operation time used to separate in a separation operation a single paper sheet from multiple paper sheets stacked in the paper sheet holder to be longer than the separation operation time used when the detected humidity is lower than the preset value.