Skew Correction Roller Separation Mechanism
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Solution Overview
Problem
Existing skew correction apparatuses in image forming systems face challenges in accurately correcting sheet skew for various types of sheets with different sizes and basis weights, leading to decreased performance and improper image formation due to excessive loop reaction forces, which cause sheet slipping and affect turning performance.
Innovation Solution
A skew correction apparatus with a first roller pair, a second roller pair upstream, and a contact portion downstream, where a separation mechanism sets the second roller pair to a separated state before skew correction, preventing interference with the sheet's turning operation and enhancing correction performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the second roller pair nips the sheet to convey it, then the sheet can be conveyed stably, but the sheet slipping occurs at the first roller pair due to excessive loop reaction force
Solution Approach 1:
The second roller pair is configured to be switchable between a nipping state and a separated state. During skew correction, the second roller pair is set to the separated state to reduce loop reaction force and prevent sheet slipping, while during normal conveyance it returns to the nipping state to ensure stable sheet transport. This dynamic adjustment resolves the contradiction between conveyance stability and skew correction reliability.
2Productivity
If the second roller pair nips the sheet, then the sheet conveyance is maintained, but the turning performance of the sheet is affected
Solution Approach 1:
The roller pairs are divided into different functional zones: the first roller pair serves as the primary nipping roller for skew correction, while the second roller pair acts as a secondary conveyance roller that can be separated. This segmentation allows the first roller pair to focus on precision skew correction without interference from the second roller pair's nipping force, thereby improving skew correction precision while maintaining conveyance continuity through the first roller pair.
3Stability of the object's composition
If the loop reaction force acts on the sheet, then the sheet returns to original state, but the sheet slips at the first roller pair before desired loop is formed
Solution Approach 1:
The second roller pair is preemptively set to the separated state before skew correction begins. This preliminary action prevents the second roller pair from contributing to excessive loop reaction force that would cause sheet slipping at the first roller pair. By removing this potential harmful effect in advance, the sheet can form the desired loop and achieve leading edge alignment without slipping, thereby improving measurement precision.
Data Source
AI summary
A skew correction apparatus includes a first roller pair configured to nip a sheet to convey the sheet, a second roller pair provided upstream of the first roller pair and configured to nip the sheet and convey the sheet, a contact portion provided downstream of the first roller pair and configured to come in contact with a leading edge of the sheet conveyed with the first roller pair to correct a skew of the sheet, and a separation mechanism configured to set the second roller pair to a separated state before the skew of the sheet conveyed downstream with the first roller pair is corrected.