Image Forming Apparatus Mixed Stacking Defect Discrimination
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing image forming apparatuses cannot efficiently discriminate defects caused by mixed stacking of sheets in the storage unit, leading to unnecessary service dispatches.
Innovation Solution
The apparatus includes a detection unit on the conveyance path to detect sheet characteristics, an obtainment unit to gather boundary information from changes in detected characteristics, and a discrimination unit to identify defects caused by mixed stacking based on this information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional temperature control techniques are used to fix images on sheets, then poor fixing caused by mixed stacking can be avoided, but the system cannot discriminate mixed stacking as the cause of defects
Solution Approach 1:
The system implements feedback by detecting sheet characteristic values during conveyance, comparing them against stored boundary information, and using this feedback to identify mixed stacking as the cause of defects. The detection unit continuously monitors sheets and provides information back to the control unit for analysis.
Solution Approach 2:
The patent introduces an intermediary detection unit and control unit that act as mediators between the sheet stack and the image forming process. These intermediaries detect characteristic values and provide boundary information to identify mixed stacking, enabling defect cause discrimination without interfering with the primary image forming function.
2Reliability
If service dispatch is engaged to resolve defects, then defects can be resolved, but productivity and efficiency are reduced due to unnecessary visits
Solution Approach 1:
The system enables self-service by automatically detecting mixed stacking conditions and identifying defect causes without human intervention. The detection unit and control unit work together to diagnose problems, allowing maintenance personnel to be dispatched only when necessary rather than for every defect.
Solution Approach 2:
The system performs preliminary action by detecting and identifying mixed stacking conditions before they cause operational failures. By obtaining boundary information and detecting characteristic values in advance, the system can predict and prevent defects, reducing the need for emergency service dispatches.
3Measurement precision
If boundary information is obtained and stored for each sheet type, then mixed stacking can be discriminated, but device complexity increases
Solution Approach 1:
The system uses parameter changes by detecting characteristic values of sheets during conveyance and comparing them against stored boundary information. Different sheet types have different characteristic value parameters, and changes in these parameters indicate mixed stacking conditions, enabling precise detection without complex structural modifications.
Data Source
AI summary
An image forming apparatus includes a detection unit, arranged on a conveyance path, configured to detect a characteristic value indicating a physical characteristic of a sheet currently conveyed on the conveyance path from a storage unit toward an image forming unit. The apparatus obtains boundary information based on a change in the detected characteristic value while discrete sheets in the sheet stack are sequentially conveyed from the storage unit. The boundary information indicates a boundary between different types of sheets in the sheet stack that has been stored in the storage unit. In a case where a defect has occurred in the apparatus, the apparatus discriminate a defect that occurs due to mixed stacking based on the obtained boundary information, the mixed stacking being stacking of a plurality of types of sheets in the storage unit.