Image Forming System Paper Length Detection Alignment
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Solution Overview
Problem
Double-sided printing using a single image forming apparatus faces productivity drops due to the need for paper circulation and misalignment issues caused by varying paper lengths, particularly in manually-cut papers, leading to positional misalignment between front and back sides.
Innovation Solution
An image forming system that includes a detector to measure the length of the transfer medium, allowing the controller to set appropriate image forming conditions, ensuring accurate alignment by determining the print start position based on the detected paper length and adjusting for differences in paper length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If double-sided printing is performed using a single image forming apparatus, then the paper circulation process is simplified, but productivity drops due to the need to reserve and circulate paper to an upstream side
Solution Approach 1:
The patent divides the double-sided printing process into two independent stages: front side printing and back side printing. By separating these operations and allowing them to proceed independently with different paper batches, the system eliminates the need for paper circulation while maintaining double-sided printing capability, thus resolving the contradiction between simplified device operation and maintained productivity
2Adaptability or versatility
If double-sided printing is performed using papers with different lengths, then various paper sizes can be handled, but image positions become misaligned between front and back sides
Solution Approach 1:
The patent performs preliminary detection of paper length before the printing process using a detection unit. By measuring the actual length of each paper sheet in advance, the system can calculate and set appropriate printing start positions for both front and back sides, ensuring accurate image alignment even when papers have different lengths. This preliminary measurement action resolves the contradiction between handling various paper sizes and maintaining precise image positioning
3Adaptability or versatility
If manual paper cutting is used to achieve various sizes, then paper versatility increases, but paper length variation causes image misalignment
Solution Approach 1:
The patent implements a feedback mechanism where the detection unit measures the actual length of each manually-cut paper sheet, and this detection result is fed back to the control unit. The control unit then adjusts the printing start position based on the detected length, creating a closed-loop control system that automatically compensates for length variations. This feedback mechanism resolves the contradiction between using diverse manually-cut paper sizes and maintaining precise image alignment
Data Source
AI summary
An image forming system, includes: an image former that performs image formation on a transfer medium; and a controller that acquires a detection result of detecting the transfer medium by a detector with respect to a length of the transfer medium, wherein the controller sets an image forming condition for the transfer medium on the basis of the length of the transfer medium obtained from the detection result.