Sheet Conveying Device Skew Correction Rotary Rollers
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Solution Overview
Problem
Existing sheet conveying devices in image forming apparatuses face challenges in accurately correcting lateral shifts and skew deviations of recording media during transport, leading to inefficiencies in image formation processes.
Innovation Solution
A sheet conveying device equipped with multiple detectors and a rotary body that performs primary and secondary movements to detect and correct angle deviations and lateral shifts, ensuring precise alignment of the recording medium along the sheet conveying path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a pair of conveying rollers conveys the recording medium, then the recording medium is transported through the image forming apparatus, but lateral shift and skew deviation occur leading to positioning inaccuracies
Solution Approach 1:
The sheet holding rollers perform preliminary skew correction by rotating about their shaft before the recording medium enters the image forming area. This preliminary action adjusts the inclination of the recording medium to match the conveying direction, preventing positioning inaccuracies before they occur during the main conveying process
Solution Approach 2:
Skew detection sensors detect the inclination of the recording medium and provide feedback signals to control the rotation of the sheet holding rollers. This feedback mechanism enables real-time adjustment of the recording medium's orientation, ensuring accurate positioning throughout the conveying process
2Manufacturing precision
If sheet holding rollers are rotated and moved to correct positional shifts, then lateral shift and skew are corrected, but the complexity of the device increases
Solution Approach 1:
The sheet holding rollers are designed to perform both conveying and skew correction functions simultaneously. By merging these functions into a single mechanism that can both rotate about its shaft and move laterally, the device achieves precise alignment without requiring separate correction mechanisms, thus reducing overall device complexity
Solution Approach 2:
The sheet holding rollers serve multiple purposes: they convey the recording medium, correct lateral shifts by moving in the width direction, and correct skew by rotating about their shaft. This multi-functionality eliminates the need for separate correction devices, simplifying the overall system while maintaining high alignment precision
3Measurement precision
If multiple detectors are used to detect angle deviation and lateral shift, then detection precision is improved, but the device complexity increases
Solution Approach 1:
The sheet holding rollers are designed to perform both conveying and skew correction functions simultaneously. By merging these functions into a single mechanism that can both rotate about its shaft and move laterally, the device achieves precise alignment without requiring separate correction mechanisms, thus reducing overall device complexity
Solution Approach 2:
Skew detection sensors detect the inclination of the recording medium and provide feedback signals to control the rotation of the sheet holding rollers. This feedback mechanism enables real-time adjustment of the recording medium's orientation, ensuring accurate positioning throughout the conveying process
Data Source
AI summary
A sheet conveying device, which is incorporated in an image forming apparatus, includes a first detector to detect an angle deviation of a recording medium to a sheet conveying direction, a second detector to detect a lateral shift of the recording medium to a width direction, a third detector to detect at least one of the angle deviation and the lateral shift after correction of the angle deviation detected by the first detector and the lateral shift detected by the second detector, and a rotary body to perform a primary movement by (1) rotating in the sheet conveying direction and returning to a reference position and by (2) moving in the width direction and returning to the reference position, and a secondary movement by performing at least one of (1) and (2) after the primary movement.