Image Forming Apparatus Skew Correction for Accurate Image Positioning
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Solution Overview
Problem
Existing image forming apparatuses fail to consider sheet skew when correcting image formation positions, leading to inaccuracies in print positioning due to variations in sheet alignment references.
Innovation Solution
An image forming apparatus with a skew feed correcting portion and detection unit that switches between modes to correct sheet skew and alignment using different reference points, such as the leading or side edges, to improve image formation accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If sheet skew is not considered in image formation position correction, then the correction process is simple, but the accuracy of image formation position deteriorates
Solution Approach 1:
The system dynamically switches between first and second correction modes based on detected sheet skew state. When skew is detected, the system transitions from conventional correction to enhanced correction mode, adapting the correction process to the actual sheet condition to maintain accuracy without unnecessary complexity in normal operation
Solution Approach 2:
The control unit changes correction parameters and reference positions based on skew detection results. By modifying correction values and reference point selection (leading edge vs side edge) according to the detected skew state, the system improves precision while managing complexity through parameter adaptation rather than structural complexity
2Adaptability or versatility
If multiple reference positions are used for correction, then the adaptability to different post-processing methods improves, but the device complexity increases
Solution Approach 1:
The system dynamically selects appropriate reference positions (leading edge, side edge, or center) based on the detected sheet skew state and required post-processing type. This dynamic adaptation allows the system to handle multiple post-processing scenarios without requiring complex fixed structures for each scenario
Solution Approach 2:
A single correction mechanism handles multiple correction scenarios by switching between different reference positions and correction values. The same hardware and control system serve both conventional and skew-corrected modes, as well as different post-processing requirements, without requiring separate dedicated systems for each function
3Manufacturing precision
If skew correction is performed using leading edge alignment, then the image formation position accuracy improves for certain post-processing methods, but the accuracy deteriorates when sheet skew varies
Solution Approach 1:
The system dynamically adjusts the correction reference position based on detected sheet skew. When leading edge alignment is detected, it uses that reference; when side edge alignment is detected, it switches to that reference instead. This dynamic switching maintains reliable accuracy across varying sheet skew conditions rather than relying on a single fixed reference
Solution Approach 2:
The detection unit continuously monitors sheet skew and provides feedback to the control unit, which then adjusts the correction mode accordingly. This closed-loop feedback mechanism ensures that the correction system adapts to actual sheet conditions, maintaining reliability under varying skew rather than assuming fixed conditions
Data Source
AI summary
An image forming apparatus includes a skew feed correcting portion, and a detection unit. A control unit selectively executes a first mode and a second mode by switching between the first mode and the second mode. In the first mode, based on the skew of a leading edge of the sheet and the position of the sheet in the width direction which are detected by the detection unit, the control unit is configured to correct the skew of the sheet to align the leading edge of the sheet with the width direction, correct the position of the sheet in the width direction using a first width direction position as a reference or using a second width direction position as a reference which is different from the first width direction position, and set an image formation position for forming the image with respect to the sheet which has been corrected.