Image Forming Apparatus Positional Deviation Adjustment via Paper Length Detection
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Solution Overview
Problem
Existing image forming apparatuses face challenges in effectively adjusting for positional deviations caused by temperature changes, leading to color misregistration issues, particularly during serial printing jobs, where the number of waits and misregistration increase, and existing solutions either require costly temperature sensors or frequent adjustments based on print counts, which can be inefficient.
Innovation Solution
An image forming apparatus with a counting unit that adjusts image forming timing based on detected paper lengths and counts, performing positional deviation adjustments when a predetermined count is reached, without the need for additional units or sensors, thereby maintaining image quality and reducing misregistration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If positional deviation adjustment is performed frequently based on print counts, then color misregistration is reduced, but the number of waits and operational efficiency deteriorate
Solution Approach 1:
The system dynamically changes the adjustment trigger condition from fixed print count intervals to variable intervals based on detected paper length deviations. When paper length deviation exceeds a threshold, the system triggers positional deviation adjustment; otherwise, it continues normal operation without adjustment, thereby adapting the adjustment frequency to actual environmental conditions rather than following a rigid schedule.
2Measurement precision
If temperature sensors are added to detect temperature changes for adjustment timing, then positional deviation adjustment accuracy is improved, but device complexity and cost increase
Solution Approach 1:
Instead of directly measuring temperature with sensors, the system uses paper length detection as an indirect indicator (proxy) of temperature changes. Since paper length expansion/contraction correlates with temperature, detecting paper length provides the necessary information about thermal conditions without requiring temperature sensors, thereby achieving the same control objective through a different measurement approach.
3Ease of manufacture
If adjustment is based on fixed print count intervals, then implementation simplicity is maintained, but adjustment effectiveness deteriorates due to ignoring temperature variations
Solution Approach 1:
The system implements a feedback mechanism where paper length detection results are continuously monitored and used to control the adjustment process. The detected paper length information feeds back to the control unit, which decides whether to trigger positional deviation adjustment based on predetermined thresholds, creating a closed-loop control system that responds to actual environmental conditions rather than operating open-loop based on fixed intervals.
Data Source
AI summary
An image forming apparatus, in which a program for carrying out an image forming method is provided, includes a transfer member to receive respective images formed on a plurality of image bearing members, an image detecting unit to detect the images conveyed on the transfer member, a paper length detecting unit to detect a length of a recording medium in a sheet travel direction, a counting unit to count the number of recording media and to change a count up value according to a detection result by the paper length detecting unit, and a control unit to control an image forming timing with respect to the image bearing members based on a detection timing of the image and to perform a positional deviation adjustment each time a counted value increases by a predetermined amount so as to reduce an amount of a positional deviation of the image.