Post-Processing Apparatus Object Detection Failure Prevention
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Solution Overview
Problem
Post-processing apparatuses fail to prevent failures when objects enter their openings, leading to potential damage and disruption in operations.
Innovation Solution
Incorporating a first and second object sensor, along with a control unit, to detect objects at different positions within the apparatus, allowing for timely intervention and prevention of failures by stopping processes or issuing warnings when an object is detected closer to the opening before it is detected at a farther position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single object sensor is used to detect objects in the post-processing area, then the device complexity is low, but the reliability of failure prevention is insufficient because the sensor cannot determine whether an object entered through the opening or from elsewhere
Solution Approach 1:
The detection area is segmented into multiple zones with separate sensors. The first sensor detects objects in the upstream area, while the second sensor detects objects near the opening. This segmentation allows the system to determine the direction of object entry based on detection sequence, improving reliability without excessive complexity.
Solution Approach 2:
The first sensor performs preliminary detection of objects before they reach the critical opening area. By detecting objects upstream first, the system can predict potential hazards and prepare preventive actions before objects actually enter the opening, enhancing failure prevention capability.
2Reliability
If multiple sensors are arranged to detect objects at different positions, then the reliability of object detection improves, but the device complexity increases due to additional sensors and control logic
Solution Approach 1:
The control unit receives feedback signals from both sensors and processes the detection sequence to determine object entry direction. When the second sensor detects an object before the first sensor, the system generates a warning signal, providing feedback-based failure prevention with manageable control complexity.
Solution Approach 2:
The system adds a temporal dimension to object detection by comparing detection timestamps from different spatial positions. This allows the system to infer object trajectory and entry direction through time-based analysis, improving detection accuracy without requiring complex spatial sensor arrangements.
3Reliability
If the system continuously monitors objects with multiple sensors, then the failure prevention capability is enhanced, but the loss of time for processing increases due to additional detection and comparison operations
Solution Approach 1:
The control unit prioritizes processing by skipping normal monitoring mode when the second sensor detects an object first. In this critical situation, the system immediately triggers warning signals and stops processing, rushing through the failure prevention sequence to minimize time loss while maintaining high reliability.
Solution Approach 2:
The system employs periodic detection cycles where sensors continuously scan for objects. During normal operation, detections follow a predictable pattern, but when the detection sequence reverses (second sensor before first sensor), the system immediately interrupts the periodic cycle to address the potential failure, balancing continuous monitoring with rapid response.
Data Source
AI summary
According to one embodiment, a post-processing apparatus includes a first sensor, a second sensor, and a control unit. The first sensor detects an object in a predetermined area in which a predetermined post-process is performed on a sheet conveyed from an image forming apparatus. The second sensor detects an object at a position closer to an opening in the area than the position of the first sensor with respect to the opening through which the sheet passes when the post-processed sheet is discharged from the area. When the second sensor detects an object before the first sensor detects the object, the control unit performs a predetermined process for preventing the occurrence of a failure.