Portable Terminal Dual-Sensor Detection for Sheet-Type Control
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Solution Overview
Problem
Existing thermal printers face inefficiencies in determining the type of sheet used due to the potential misalignment of sheet marks with sensor units, leading to prolonged processing times as sheets are conveyed in both forward and reverse directions to detect marks.
Innovation Solution
A portable terminal equipped with multiple sensor units that detect the presence or absence of sheets and marks, allowing for rapid determination of sheet type by conveying sheets in a reverse direction after initial detection, and utilizing a cutter unit to avoid unnecessary cutting operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single sensor unit is used to detect sheet marks, then device complexity is reduced, but sheet type determination time increases due to forward and reverse conveyance
Solution Approach 1:
The single sensor unit is divided into two separate sensor units: a first sensor unit for detecting sheet presence/absence and a second sensor unit for detecting sheet marks. This segmentation allows simultaneous or independent operation of detection functions, eliminating the need for reverse conveyance and reducing sheet type determination time while maintaining simple device architecture.
2Loss of substance
If sheet conveyance in reverse direction is performed to return sheet to leading edge, then sheet waste is prevented, but processing time increases
Solution Approach 1:
The first sensor unit performs preliminary detection of sheet presence/absence at the cutter unit position before cutting operations. This preliminary action allows the system to determine whether sheet return is necessary in advance, preventing unnecessary reverse conveyance and reducing processing time while still preventing sheet waste when needed.
3Measurement precision
If mark detection is performed on the second sheet due to misalignment, then accurate sheet type determination is achieved, but one sheet is wasted
Solution Approach 1:
The first sensor unit acts as an intermediary by detecting sheet presence/absence at the cutter unit position before mark detection. This intermediary detection provides advance warning of sheet conditions, allowing the system to adjust positioning or prepare for potential sheet waste without affecting the accuracy of mark detection on the second sheet.
4Productivity
If the cutter unit operates without sheet presence verification, then cutting speed is maintained, but sheet waste occurs when no sheet is present
Solution Approach 1:
The first sensor unit provides feedback on sheet presence/absence at the cutter unit position to the control system. This feedback mechanism allows the cutter unit to operate at high speed when sheets are present while automatically preventing operation when no sheet is detected, eliminating sheet waste without significantly reducing cutting productivity.
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 swift and accurate identification of sheet types, reducing processing time and optimizing sheet handling by minimizing unnecessary conveyance and cutting operations.
Implementation Method 1
a first sensor unit configured to detect presence or absence of a sheet
Implementation Method 2
a second sensor unit configured to detect information related to a mark provided on the sheet
Data Source
AI summary
A portable terminal has a thermal head. The portable terminal includes a first sensor unit configured to detect presence or absence of a sheet, a second sensor unit configured to detect information related to a mark provided on the sheet, and a sheet determination unit configured to determine a kind of the sheet. The sheet determination unit is configured to determine a kind of the sheet based on a result of detecting information related to the mark with use of the second sensor unit after the sheet is conveyed in a reverse direction with respect to a direction of discharging the sheet.