Thermal Printer Paper Bias Detection Near the Discharge Port
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing image forming apparatuses lack accurate detection of paper discharging abnormalities, such as jams and misalignments, which can lead to inefficiencies and user inconvenience.
Innovation Solution
The apparatus incorporates dual detection units positioned on both sides of the discharge port to detect biases in the paper conveyance path, utilizing spring-loaded flappers and sensors to accurately identify paper misalignments and jams, with a control system to manage these detections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single detection unit is installed downstream of the platen roller, then the device complexity is low, but the measurement precision of paper abnormality detection is insufficient
Solution Approach 1:
The detection system is segmented into multiple independent detection units positioned at different locations (upstream and downstream of the platen roller) and oriented at different angles. Each detection unit independently monitors specific aspects of paper discharge, allowing the system to achieve comprehensive detection coverage and high measurement precision without excessive complexity through modular design.
2Measurement precision
If dual detection units are positioned on both sides of the discharge port, then the measurement precision of bias detection is improved, but the device complexity increases
Solution Approach 1:
Each detection unit is equipped with flappers positioned at specific locations (upstream and downstream of the platen roller) with tailored detection angles. The upstream detection unit uses flappers oriented to detect biases in one direction, while the downstream unit uses flappers oriented to detect biases in another direction. This localized optimization of detection qualities enables precise bias detection without requiring a uniformly complex detection system throughout.
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
Enhances the accuracy of paper discharging abnormality detection, allowing timely intervention to prevent jams and misalignments, thereby improving operational efficiency and user experience.
Implementation Method 1
utilizing spring-loaded flappers and sensors to accurately identify paper misalignments and jams
Data Source
AI summary
A thermal printer 1 that forms an image on sheet-shaped paper P using a print head 21 and discharges the paper P through a discharge port, the printer 1 including: an upper detection unit 31 provided closer to a side of the discharge port than to the print head 21 in a conveyance path of the paper P, the upper detection unit 31 being provided above the conveyance path and configured to detect an upward bias by the paper P; and a lower detection unit 32 provided closer to the side of the discharge port than to the print head 21 in the conveyance path, the lower detection unit 32 being provided below the conveyance path and configured to detect a downward bias by the paper P.