Image Forming Apparatus Pressure Control for Sheet Compatibility
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Solution Overview
Problem
Image forming apparatuses experience error printing due to incompatibility between the pressure set by the pressure control unit and the type of printing sheet, leading to issues such as creasing of envelopes and inadequate toner fixation on other sheets.
Innovation Solution
An image forming apparatus with a pressure control unit that adjusts the pressure of the fixing/pressurizing roller pair based on the type of transfer sheet, a compatibility determining unit to assess pressure compatibility, and a control unit that notifies the user of incompatibility or adjusts the printing speed to prevent errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the pressure control unit uses a fixed pressure setting for all sheet types, then the device complexity is reduced, but manufacturing precision deteriorates due to creasing on envelopes and inadequate toner fixation on other sheets
Solution Approach 1:
The pressure control unit dynamically adjusts the pressing force based on the detected sheet type. The fixing/pressurizing roller pair switches between normal mode and envelope mode with changing pushing force per unit area, making the pressure adaptive rather than fixed, thereby resolving the contradiction between device simplicity and image quality.
Solution Approach 2:
The system changes the pressure parameter according to the sheet type detected by the sheet type detecting unit. By varying the pressing force parameter (normal pressure for plain paper, reduced pressure for envelopes), the system achieves optimal image quality for different materials without requiring complex mechanical structures.
2Manufacturing precision
If the pressure control unit adjusts pressure based on sheet type, then manufacturing precision is improved, but device complexity increases due to additional control mechanisms
Solution Approach 1:
The sheet type detecting unit provides feedback about the inserted sheet to the pressure control unit, which then automatically adjusts the pressure setting. This feedback loop enables precise pressure control for different sheet types without requiring manual intervention or overly complex mechanical switching mechanisms.
Solution Approach 2:
The system performs self-adjustment of pressure based on automatic sheet type detection. The pressure control unit autonomously selects the appropriate pressure mode (normal or envelope) based on the detected sheet type, eliminating the need for manual pressure adjustment mechanisms and reducing overall device complexity.
3Strength
If the fixing/pressurizing roller pair uses high pressure for all sheets, then toner fixation is improved, but harmful factors increase due to creasing and damage to envelope surfaces
Solution Approach 1:
The pressure applied by the fixing/pressurizing roller pair is locally adapted to the specific sheet type. Envelopes receive reduced pressure in envelope mode to prevent surface damage and creasing, while plain paper receives normal pressure for optimal toner fixation, ensuring each material receives the appropriate local treatment.
Solution Approach 2:
The pressing force of the fixing/pressurizing roller pair dynamically switches between high pressure (normal mode) and low pressure (envelope mode) based on the detected sheet type. This dynamic adjustment prevents harmful effects on envelopes while maintaining effective toner fixation on suitable materials.
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
Prevents error printing by ensuring compatible pressure settings for various types of sheets, allowing for successful toner fixation and preventing creasing, even when the pressure mode is not initially compatible with the sheet type.
Implementation Method 1
a fixing/pressurizing roller pair that nips a transfer sheet and transports to fix toner on the transfer sheet
Data Source
AI summary
An image forming apparatus according to an aspect of the present invention includes a fixing/pressurizing roller pair that nips a transfer sheet and transports to fix toner on the transfer sheet; a pressure control unit that controls a pressure demonstrated by the fixing/pressurizing roller pair in consideration of the type of the transfer sheet; a transfer sheet compatibility determining unit that determines whether or not the pressure set by the pressure control unit is compatible with the transfer sheet to be inserted between the fixing/pressurizing roller pair; and a control unit that performs a process to cause to notify a user of incompatibility and/or a process to forbid printing if the transfer sheet compatibility determining unit determines that the pressure set by the pressure control unit is not compatible with the transfer sheet.