Paper Conveyance Jam Detection Using Temporal Sensor States
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Solution Overview
Problem
Conventional paper conveying devices determine the removal position for jammed paper based solely on current signal statuses from detection sensors, which can lead to inappropriate display of removal zones due to sensor arrangement and path geometry, and increasing sensor numbers to improve detection is costly.
Innovation Solution
A paper conveying device that includes multiple paper jam removal zones and detection sensors, where the display controlling means identifies the most appropriate removal zone by combining current and previous signal statuses from the sensors, allowing for more accurate display of the removal position without increasing the number of sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the removal position is determined based only on current signal statuses from paper detection sensors, then the system structure remains simple, but the accuracy of removal position determination becomes insufficient
Solution Approach 1:
The system stores previous signal statuses from paper detection sensors before the current detection moment. By comparing current and previous sensor states, the system can determine the paper's movement direction and calculate the most appropriate removal position in advance, improving accuracy without requiring complex real-time analysis
Solution Approach 2:
The system uses feedback from previous sensor readings to refine the current determination. By continuously comparing current signal statuses with stored previous statuses, the system adjusts its removal position determination based on the paper's actual movement pattern, achieving higher precision through iterative feedback
2Measurement precision
If the number of paper detection sensors is increased to improve detection accuracy, then the measurement precision improves, but the device complexity and cost increase
Solution Approach 1:
Instead of using more sensors to achieve better detection, the system dynamically processes the signals from existing sensors by comparing temporal changes in their output. The system determines paper position and movement by analyzing the dynamic behavior of fewer sensors rather than relying on a larger static array
Solution Approach 2:
The system continuously monitors and stores signal statuses from the sensors over time. By maintaining continuous observation of sensor states and comparing them across time points, the system extracts useful information about paper position and movement from the same sensors repeatedly, eliminating the need for additional sensors
3Reliability
If paper detection sensors are arranged in specific patterns along the conveyance path, then the device structure becomes simpler, but the reliability of removal position determination decreases
Solution Approach 1:
The system pre-stores the spatial relationships and signal characteristics associated with different sensor states before paper jam occurs. By having this preliminary information about sensor patterns and paper positions, the system can reliably determine removal positions without needing complex real-time calculations or sophisticated sensor arrangements
Data Source
AI summary
A paper conveying device includes: a conveyance path, along which paper is conveyed; paper jam removal zones provided side by side along the conveyance path; paper detection sensors respectively provided in the paper jam removal zones for detecting the presence or absence of paper; a paper jam detecting section for detecting paper jam based on output signals from the paper detection sensors; a signal storing section for storing previous signal statuses just before current signal statuses of the output signals of the paper detection sensors; a display section for displaying one of the paper jam removal zones; and a display controlling section for identifying the one of the paper jam removal zones based on the current signal statuses and the previous signal statuses of the paper detection sensors when paper jam is detected, and displaying the identified paper jam removal zone on the display section.