Printer Carriage Sensor for Raised Surface Detection
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Solution Overview
Problem
Printers face issues with smears and damage due to contact between the printing carriage and protruding elements of the printing medium, leading to potential jams and cross-contamination between printheads, especially when dealing with flexible or rigid media that may collide or scratch the carriage components.
Innovation Solution
A printer carriage equipped with a sensor and an actuation member that can detect raised portions of the printing medium, adjusting its vertical position to avoid contact and prevent damage by actuating the sensor when a protrusion is sensed, thereby stopping the carriage movement to prevent collisions and smudging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the printer carriage moves closely over the printing medium to ensure printing precision, then printing quality is improved, but the risk of contact with protruding elements increases causing smears and damage
Solution Approach 1:
The sensor assembly detects protruding elements on the printing medium before the printhead reaches them. By提前 detecting the raised portions and adjusting the carriage position or speed, the system prevents contact between the printhead and protruding elements, thus avoiding smears and damage while maintaining close printing distance for quality output
Solution Approach 2:
The sensor assembly acts as an intermediary between the printing medium and the printhead. It detects protruding elements and provides advance warning, allowing the control system to take preventive actions (such as pausing or adjusting carriage position) before the printhead encounters potential hazards, thus protecting the printing process
2Object-affected harmful factors
If the printer carriage maintains a safe distance from the printing medium to avoid contact, then damage is prevented, but printing precision and quality deteriorate
Solution Approach 1:
The sensor assembly is positioned ahead of the printhead to detect protruding elements in advance. This allows the system to maintain a close printing distance for quality output while having sufficient time to detect hazards and take preventive actions before contact occurs
Solution Approach 2:
The sensor assembly provides real-time feedback about the printing medium surface conditions to the control system. Based on this feedback, the control system dynamically adjusts the carriage position or speed to avoid contact with protruding elements, enabling the printhead to operate at optimal close distance for quality printing
3Measurement precision
If the sensor is positioned closer to the printing medium for better detection accuracy, then detection precision is improved, but the risk of contact with protruding elements increases
Solution Approach 1:
The detection system is segmented into multiple sensor assemblies positioned at different locations and distances from the printing medium. This allows the system to use the closer sensor for high-precision detection while the farther sensor provides early warning, dividing the detection function to simultaneously achieve both accuracy and safety
Solution Approach 2:
The sensor assembly positioned closer to the printing medium detects protruding elements with high precision. By combining this with advance detection capability, the system can maintain accurate detection while having sufficient time to respond before contact occurs
Data Source
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AI summary
A printer carriage comprises a sensor to be actuated when an actuation member coupled to the sensor contacts a raised portion in a printing target. A vertical position of the actuation member may be adjusted with respect to the printer carriage.