Media Stiffness Sensor Assembly for Automatic Weight Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current imaging devices require users to manually input media type, weight, and texture, leading to incorrect settings that result in print quality defects, increased service calls, and hardware failures due to inadequate media weight adjustments, especially with lighter weight media that is more prevalent with recycled fiber content.
Innovation Solution
A method for automatically determining media weight by positioning a media sheet to form a cantilevered portion and using a moveable contact member to measure time-varying motor parameters such as peak current, root mean square current, travel energy, and rate of change of current or voltage, allowing for adjustment of imaging device operating parameters like media speed, fuser temperature, and transfer voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If manual media type input is required, then device complexity is reduced, but media weight detection precision deteriorates leading to incorrect settings
Solution Approach 1:
The imaging device automatically detects media weight using a stiffness sensor assembly without requiring user input. The system performs self-measurement of media properties (weight, thickness, stiffness) and automatically adjusts operating parameters, eliminating the need for manual media type entry while improving detection accuracy.
2Speed
If media weight is set too low, then printer speed can be increased, but fuser temperature becomes too low causing cold offset
Solution Approach 1:
The system uses a stiffness sensor assembly to continuously monitor media weight and provides feedback to the control system. Based on this feedback, the controller automatically adjusts fuser temperature and printer speed to maintain optimal operating conditions, preventing both cold offset (from too low temperature) and media wrap (from too high temperature).
Solution Approach 2:
The system dynamically changes operating parameters (fuser temperature, printer speed, transfer voltage) based on the detected media weight. The controller modifies these parameters in real-time to match the actual media properties, ensuring proper toner fusion and preventing hardware damage across different media types.
3Reliability
If media weight is set too high, then fuser temperature can be increased, but media wraps the fuser causing hardware failure
Solution Approach 1:
The stiffness sensor assembly provides continuous feedback on media weight to the controller, which automatically adjusts fuser temperature to prevent excessive heat. This feedback mechanism ensures that fuser temperature remains high enough for proper toner fusion on heavy media while staying low enough to prevent media wrap and hardware failure.
4Adaptability or versatility
If light weight media is used, then recycled fiber content increases, but media becomes more prone to fuser wrapping
Solution Approach 1:
The imaging device automatically detects the weight and stiffness properties of light weight recycled media and adjusts operating parameters accordingly. The stiffness sensor assembly measures media properties and the controller modifies fuser temperature and handling parameters to prevent wrap, enabling reliable processing of delicate recycled media without manual intervention.
Solution Approach 2:
The system changes fuser temperature and handling parameters based on detected media weight to accommodate light weight recycled media. By lowering fuser temperature and adjusting feed mechanisms, the system prevents media wrap while maintaining proper toner fusion on delicate recycled fiber content.
5Device complexity
If existing sensors are used, then device complexity is reduced, but measurement precision deteriorates due to broad standard deviations
Solution Approach 1:
The patent replaces complex optical, acoustic, or visual inspection systems with a simple mechanical stiffness sensor assembly. The sensor measures media weight indirectly through stiffness characteristics using a cantilever beam mechanism, achieving high precision without complex electronics or algorithms while maintaining low device complexity.
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
This solution enables accurate media weight determination and adjustment of imaging device parameters, improving print quality, reducing service calls, and extending hardware lifespan by ensuring proper media handling and processing.
Implementation Method 1
using a motor to move the first contact member from a home position thereof through a travel distance to bend the cantilevered portion of the media sheet
Data Source
AI summary
A method of determining a media weight using a media stiffness sensor in an imaging device. A media sheet is staged having a cantilevered portion which is deflected by a contact member translated into the cantilevered portion. Based on the energy used to move the contact member through a travel distance, a media weight can be determined. An operating parameter of the imaging device may be adjusted based on the media weight that was determined.