Heating Unit Positioning via Dynamic Pressing Member
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Solution Overview
Problem
The existing fixing devices for toner images on recording media require precise positioning of heating and pressure units, which complicates maintenance and part replacement due to the need for accurate alignment and suppression of urging forces during positioning.
Innovation Solution
A fixing device with a heating unit, pressure unit, first frame, urging member, and support member that allows easy positioning and attachment of the heating unit, featuring a pressing member with a spring mechanism to manage the urging force and simplify the positioning process within the frame.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the frame on the heating unit side is moved to the closing position while the pressing member is in contact with the heating unit, then the heating unit is positioned in the conveyance direction, but the urging force of the pressing member must be reduced to enable frame movement
Solution Approach 1:
The pressing member is designed to be movable between a pressing state (contacting the heating unit for positioning) and a retracted state (not contacting, allowing easy frame movement). This dynamic transition resolves the contradiction by allowing the system to achieve precise positioning when needed while maintaining ease of operation during frame movement.
Solution Approach 2:
The frame is designed to be movable to the opening position before the pressing member contacts the heating unit, allowing the heating unit to be preliminarily positioned without the constraint of the pressing member's urging force. This preliminary positioning action occurs when the frame is in the opening position, avoiding the need to reduce urging force during movement.
2Manufacturing precision
If the pressing member continuously urges the heating unit during frame movement, then the heating unit maintains its position, but the frame cannot be easily moved to the opening position for maintenance
Solution Approach 1:
The pressing member transitions from a continuous urging state to a non-contact state when the frame is moved to the opening position for maintenance. This dynamic behavior allows the heating unit to maintain its positioned state during normal operation while enabling easy access and maintenance when the frame is opened.
Solution Approach 2:
The positioning function is segmented into two distinct operational modes: positioning mode (when frame is closed, pressing member contacts heating unit) and maintenance mode (when frame is open, pressing member is retracted). This segmentation allows each mode to optimize for its specific function without compromising the other.
3Manufacturing precision
If the frame structure is designed to accommodate both positioning and maintenance functions, then the heating unit can be positioned accurately, but the device complexity increases
Solution Approach 1:
The frame structure is designed with multi-functionality, serving both as a positioning structure (when closed with pressing member engaged) and as a maintenance access structure (when opened). This universal design eliminates the need for separate structures for positioning and maintenance, reducing overall device complexity.
Solution Approach 2:
The positioning function and maintenance access function are merged into a single frame structure. The same frame that provides positioning support when closed also provides maintenance access when opened, combining multiple functions into one structure rather than requiring separate components for each function.
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
Enhances the operability and ease of maintenance by allowing the heating unit to be easily positioned and attached, reducing the complexity of maintenance tasks such as part replacement and minimizing the risk of jamming during the process.
Implementation Method 1
an urging member configured to urge the heating unit to position the heating unit
Data Source
AI summary
A fixing device includes a heating unit, a pressure unit, a first frame, an urging member, a support member, and a fixing member. The heating unit heats toner carried by a recording medium. The pressure unit pressurizes the heating unit to form a nip portion with the heating unit and fixes a toner image onto the recording medium at the nip portion with the heating unit. The first frame moves to a first position where the heating unit is exposed and moves to a second position where the heating unit is covered. The urging member urges the heating unit to position the heating unit. The support member supports one end of the urging member and the fixing member fixes the support member to the fixing device.