Multi-Point Fixing Unit Attachment Detection in Image Formers
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Solution Overview
Problem
Existing image forming apparatuses face issues with accurate detection of the attachment state of the fixing unit, leading to potential printing failures and paper jams due to incomplete or incorrect alignment, as conventional drawer connectors may not ensure complete physical insertion even when electrical connections are established.
Innovation Solution
The apparatus incorporates a first and second fixing unit attachment detection portion positioned differently from the main body-side connector, utilizing flags and optical sensors to detect the attachment state of the fixing unit, ensuring accurate alignment and preventing printing operations when the fixing unit is not correctly attached.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If drawer connectors are used to establish electrical connection for detecting fixing unit attachment, then electrical connection is established, but the connector may not be completely inserted even when terminals are connected, leading to inaccurate attachment detection
Solution Approach 1:
The attachment detection function is segmented into multiple independent detection portions (first and second detection portions) positioned at different locations. Each detection portion independently checks attachment status, and both must confirm proper attachment for the system to recognize the fixing unit as correctly installed. This segmentation ensures that partial or incomplete insertion of connectors does not lead to false positive detection results.
2Device complexity
If attachment detection is performed only at connector position, then detection structure is simple, but other portions of fixing unit may not be inserted to predetermined positions, causing misalignment
Solution Approach 1:
The detection system transitions from a single-point detection approach to a multi-point detection approach by adding detection portions at different longitudinal positions along the fixing unit. This dimensional expansion of the detection space ensures that both the connector position and other critical portions of the fixing unit are verified to be correctly inserted and aligned, preventing misalignment issues while maintaining relatively simple detection structures.
3Ease of operation
If fixing unit is made detachable to allow easy removal of transfer material, then ease of operation is improved, but attachment detection accuracy deteriorates due to incomplete insertion
Solution Approach 1:
The system implements a feedback mechanism where the control unit receives detection signals from multiple detection portions and uses this feedback to determine whether the fixing unit is properly attached before allowing printing operations. The control unit can provide feedback to the user about the attachment status and prevent operation when attachment is incomplete, thus maintaining ease of operation while improving detection reliability through multiple verification points.
Data Source
AI summary
An image forming apparatus includes a main body and a fixing unit, as well as first and second fixing unit attachment detection portions, each of which includes an optical sensor. The fixing unit is detachably attached to the main body, and includes a unit-side connector which connects with a main body-side connector when the fixing unit is attached to the main body to receive power. The first fixing unit attachment detection portion is at a different position on the main body from where the main body-side connector is located in a longitudinal direction of the fixing unit. The second fixing unit attachment detection portion is at a different position on the main body from where the main body-side connector is located and a position where the first fixing unit attachment detection portion is disposed in the longitudinal direction of the fixing unit.