Printing Apparatus Intermediate Sensor Anti-Static Control
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Solution Overview
Problem
Printing apparatuses face issues with medium jams on transportation belts, particularly when the medium is smaller than the distance between sensors, leading to detection challenges and potential damage from electrostatic attraction.
Innovation Solution
A printing apparatus with an intermediate sensor between upstream and downstream sensors, an anti-static unit that neutralizes the medium, and a control unit to manage the anti-static unit's position, ensuring accurate detection and reduced electrostatic attraction risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If only upstream and downstream sensors are used to detect medium jams, then the device complexity is reduced, but medium jams smaller than the distance between sensors cannot be detected
Solution Approach 1:
The detection zone between upstream and downstream sensors is segmented by adding an intermediate sensor. This divides the original single detection span into two smaller spans, enabling detection of smaller jammed media that would otherwise pass undetected between the outer sensors.
Solution Approach 2:
The intermediate sensor is positioned to detect medium from a different spatial dimension (from below through the transportation belt), while upstream and downstream sensors detect from above. This multi-dimensional sensing approach ensures comprehensive jam detection regardless of medium size or position.
2Productivity
If the transportation belt maintains strong electrostatic attraction to transport medium, then the productivity is improved, but the medium may become excessively charged causing jams
Solution Approach 1:
An anti-static unit acts as an intermediary between the transportation belt and the medium. It periodically neutralizes excessive electrostatic charge on the medium, allowing the belt to maintain strong electrostatic attraction for efficient transport without causing harmful over-charging that would lead to jams.
Solution Approach 2:
The anti-static unit operates periodically rather than continuously, neutralizing charge at intervals as the medium travels along the belt. This periodic intervention maintains optimal charge levels for transportation while preventing harmful accumulation.
3Reliability
If the anti-static unit is positioned to contact the medium, then the electrostatic attraction force is improved, but the intermediate sensor cannot detect the medium
Solution Approach 1:
The anti-static unit is made movable between two positions: a first position where it contacts the medium to provide electrostatic attraction, and a second position where it moves away to allow the intermediate sensor to detect the medium. This dynamic repositioning resolves the conflict between maintaining attraction and enabling detection.
Solution Approach 2:
The anti-static unit performs its charge-neutralizing action at a specific location, then moves away before the intermediate sensor needs to detect the medium. This temporal and spatial sequencing ensures that when detection is needed, the sensor has unobstructed access to the medium.
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
Effectively detects and resolves medium jams, maintains electrostatic attraction, and reduces contamination of sensors by particulates, enabling precise jam handling and efficient operation.
Implementation Method 1
an anti-static unit configured to electrically neutralize the medium transported by the transportation belt when coming into contact with the medium
Implementation Method 2
a transportation belt that faces the printing unit and transports the medium... the anti-static unit is configured to electrically neutralize the medium transported by the transportation belt
Data Source
AI summary
A printing apparatus which appropriately deals with a medium jam occurring on the transportation belt is provided.