Security Paper Sensor Integrated Feeding Path Detection
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Solution Overview
Problem
Conventional printers for security paper require a separate structure on the cassette, leading to interference issues and the inability to use manual trays, as they struggle to distinguish between security paper and normal paper effectively.
Innovation Solution
A printer with a security paper sensor positioned on the feeding path, comparing initial and subsequent sensing values to determine if the paper is security or normal, allowing for accurate differentiation without additional cassette structures, enabling operation with manual trays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate structure with security paper sensor is disposed on the cassette, then security paper can be sensed before feeding, but the structure becomes complex and manual tray function becomes unavailable
Solution Approach 1:
The security paper sensor is merged with the existing paper feeding path structure rather than being disposed separately on the cassette. The sensor is integrated into the paper conveying mechanism, allowing it to detect security paper during the feeding process without requiring additional separate structures on the cassette.
Solution Approach 2:
The sensor detects security paper characteristics during the feeding process at a point where the paper is being conveyed, which is a preliminary action before the paper reaches the printing position. This allows detection without requiring the sensor to be positioned on the cassette itself.
2Reliability
If sheets of security paper are stacked on the cassette for sensing, then security paper can be detected, but interference between stacked sheets interrupts sensor operation
Solution Approach 1:
The sensor utilizes magnetic field detection rather than direct contact with stacked papers. By detecting magnetic characteristics during the feeding process, the system avoids interference from stacked sheets while maintaining reliable security paper identification.
3Adaptability or versatility
If a manual tray is used for paper feeding, then flexibility is improved, but conventional sensors cannot detect security paper without separate cassette structures
Solution Approach 1:
The sensor system is designed to work universally with different paper feeding mechanisms including manual trays. By integrating the sensor into the common paper feeding path rather than requiring cassette-specific structures, the system maintains security paper detection capability across multiple tray types and feeding methods.
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
Enables seamless operation in common multifunction printers by distinguishing security paper from normal paper, allowing printing operations without separate cassette structures and supporting manual tray functions.
Implementation Method 1
a security paper sensor disposed on a printing paper feeding path... comparing a first sensing value sensed by the security paper sensor with one or more second sensing values sensed by the security paper sensor
Data Source
AI summary
A printer for security paper, such as a multifunction printer, a printer, a facsimile machine or a copier, is configured to perform a printing operation by distinguishing between security paper and normal paper. The printer for security paper includes: security paper sensor disposed on a printing paper feeding path; and a control unit for comparing a first sensing value sensed by the security paper sensor when printing paper to be determined is not present near the security paper sensor with one or more second sensing values sensed by the security paper sensor for the corresponding printing paper on the feeding path, during the course of conveying the corresponding printing paper on the feeding path, determining printing paper as security paper when a comparison value is above a predefined reference value, and determining printing paper as normal paper when the comparison value is below the predefined reference value.