Conveying Device Lateral Registration Correction
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Solution Overview
Problem
Conventional image forming apparatuses face challenges in accurately correcting lateral registration of recording media without causing skew or increasing the apparatus size, due to the conveying resistance associated with linear or large curvature conveying paths.
Innovation Solution
A conveying device with movable pairs of nipping rollers and a detecting unit that corrects positional deviations in the width direction by moving the rollers based on detection results, allowing for precise lateral registration correction without skewing, and optionally switching operations based on recording medium thickness or size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a linear conveying path or a conveying path with a large curvature radius of 50 millimeters or more is provided on an upstream side of the pair of lateral registration rollers, then the conveying resistance of the recording medium is reduced, but the size of the entire apparatus is increased
Solution Approach 1:
The patent applies a curved conveying path with a small curvature radius (10mm or less) instead of a linear path or large curvature path. This curved path guides the recording medium through the nipping rollers while maintaining controlled conveying resistance, achieving lateral registration correction without requiring a large apparatus footprint.
Solution Approach 2:
The patent employs movable nipping rollers that can move in the width direction to dynamically correct lateral registration. The rollers are positioned to nip the recording medium at specific points along the curved path, enabling active adjustment of the medium's position while it travels through the compact conveying path.
2Manufacturing precision
If the pair of lateral registration rollers moves the recording medium in the width direction while nipping it, then the lateral registration is corrected, but the recording medium may skew or wrinkle due to conveying resistance
Solution Approach 1:
The curved conveying path with small curvature radius (10mm or less) is designed to work in conjunction with the nipping rollers. The curve geometry distributes the conveying resistance more evenly, preventing concentrated stress that would cause skew or wrinkles while the rollers correct lateral registration.
Solution Approach 2:
The nipping rollers are positioned on the upstream side of the curved path, allowing lateral registration correction to occur before the recording medium enters the high-resistance curved section. This preliminary correction prevents subsequent skewing that would occur if correction happened after the medium had already been subjected to conveying resistance.
Data Source
AI summary
A conveying device includes a pair of first nipping rollers configured to be movable in a width direction while nipping a recording medium and rotate to convey the recording medium; a pair of second nipping rollers configured to be movable in the width direction while nipping the recording medium and rotate to convey the recording medium, the pair of second nipping rollers being arranged on an upstream side of the first nipping rollers in a conveying path; and a detecting unit configured to detect an amount of positional deviation in the width direction of the recording medium being conveyed in the conveying path. The pair of first nipping rollers is moved in the width direction based on a detection result of the detecting unit while the pair of first nipping rollers nips the recording medium so that a positional deviation of the recording medium in the width direction is corrected.