Printed Sheet Charge Measurement for Adaptive Charge Elimination
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Solution Overview
Problem
Existing printing systems fail to effectively adjust charge elimination settings based on the printing environment and sheet type, leading to insufficient or excessive charge elimination, which can degrade print quality and cause sheet feeding failures.
Innovation Solution
A printing system with a measurement unit to assess charge levels on sheets post-processing and a display unit to prompt users to adjust charge elimination settings when charge levels are outside predetermined ranges, ensuring appropriate charge elimination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If charge elimination is performed using a charge eliminating roller, then static electricity on sheets is reduced, but the amount of charge elimination cannot be properly adjusted for different sheet types and environments
Solution Approach 1:
The patent implements dynamic adjustment of charge elimination by allowing the voltage applied to the charge eliminating roller to be changed based on sheet type and environmental conditions. The control unit adjusts the voltage level dynamically to match the specific charging characteristics of different sheet materials (plain paper, synthetic resin, coated paper) and environmental factors (humidity, temperature), transforming a static charge elimination system into an adaptive one.
Solution Approach 2:
The patent changes the electrical parameter (voltage level) of the charge eliminating roller based on the sheet type and environmental conditions. By adjusting the voltage parameter, the system optimizes charge elimination effectiveness for each specific case, whether dealing with low electrical resistance sheets that charge quickly or high electrical resistance sheets that retain charge longer.
2Ease of operation
If fixed charge elimination settings are used, then the system is simple to operate, but charge elimination effectiveness varies with environment and sheet type
Solution Approach 1:
The patent implements a self-adjusting system where the control unit automatically selects and applies the appropriate voltage level for charge elimination based on the detected sheet type and environmental conditions. The system serves itself by making automatic adjustments without requiring user intervention or complex manual configuration, maintaining ease of operation while improving reliability through adaptive behavior.
Solution Approach 2:
The system incorporates feedback mechanisms that monitor environmental conditions (humidity, temperature) and sheet type characteristics, then use this information to adjust the charge elimination voltage accordingly. This closed-loop approach ensures consistent charge elimination effectiveness across varying conditions while keeping the operation simple for the user.
3Reliability
If charge elimination voltage is increased to handle high electrical resistance sheets, then charge elimination improves for synthetic resin and coated paper, but may cause excessive charge on low electrical resistance sheets
Solution Approach 1:
The patent applies the principle of local quality by tailoring the charge elimination voltage to the specific electrical resistance characteristics of each sheet type. Instead of using a uniform high voltage for all sheets, the system applies differentiated voltage levels: higher voltages for high electrical resistance sheets (synthetic resin, coated paper) that need stronger charge elimination, and lower voltages for low electrical resistance sheets (plain paper) that charge more easily but eliminate charge quickly, preventing excessive charging.
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
Ensures effective charge elimination, preventing sheet sticking and degradation, thereby maintaining print quality and avoiding sheet feeding issues.
Implementation Method 1
Charge elimination with a configuration in which a voltage is applied to a conveying roller (hereinafter, referred to as 'charge eliminating roller') involves giving a charge of the opposite polarity to a charge on a sheet via the charge eliminating roller to the sheet to neutralize the charge on the sheet
Data Source
AI summary
A method of controlling a printing system including a printing apparatus that prints an image on a sheet and a charge eliminating apparatus that performs a charge eliminating process on the sheet on which the image is printed includes measuring an amount of charge on the sheet that has undergone the charge eliminating process performed by the charge eliminating apparatus, and displaying a message prompting a user to change a setting for charge elimination to be performed by the charge eliminating apparatus in a case where the amount of charge on the sheet measured in the measuring does not fall within a predetermined range.