Sheet Skew Detection With Variable Intervals for Mixed Media Sizes
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Solution Overview
Problem
Existing sheet conveying devices face issues with decreased skew detection accuracy due to varying medium sizes, as they detect skew regardless of the size of the medium, leading to inefficiencies in deskewing large or small sheets.
Innovation Solution
A sheet conveying device with conveyors, a skew detector, and a mover that moves the skew detector in a direction orthogonal to the sheet conveyance to detect the skew multiple times, adjusting detection intervals based on sheet size, enhancing accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If skew detection is performed regardless of medium size, then all media can be processed, but skew detection accuracy decreases for large or small media
Solution Approach 1:
The patent applies dynamics by making the detection interval variable rather than fixed. The control unit dynamically adjusts the detection interval based on the medium size, performing multiple detections at different intervals for large media and fewer detections for small media. This dynamic adjustment resolves the contradiction by adapting the detection strategy to match the specific medium being processed, maintaining high accuracy across all sizes.
Solution Approach 2:
The patent changes the parameter of detection interval based on medium size. By modifying this key parameter dynamically according to the detected medium dimensions, the system achieves both versatility in handling various sizes and precision in skew detection. The control unit implements this by selecting appropriate detection intervals from a set of predefined intervals based on the medium size classification.
2Measurement precision
If multiple skew detections are performed, then skew detection accuracy improves, but processing time increases
Solution Approach 1:
The patent applies local quality by performing multiple skew detections only at specific local positions appropriate for large media, rather than uniformly across all media types. The control unit determines the medium size and selectively applies multiple detections only when necessary (for large media), while using fewer detections for small media. This localized approach maintains high accuracy where needed while minimizing unnecessary processing time.
Solution Approach 2:
The patent implements partial action by performing the full set of multiple skew detections only partially - specifically, only when the medium size warrants it. The control unit assesses the medium size and applies the appropriate level of detection effort, avoiding excessive detections for small media while ensuring sufficient detections for large media. This partial application of multiple detections optimizes the balance between accuracy and processing time.
Data Source
AI summary
A sheet conveying device includes conveyors, a skew detector, a mover, and circuitry. The conveyors convey a sheet medium in a first direction. The skew detector detects an amount of skew of the sheet medium conveyed by the conveyors in the first direction. The mover moves the skew detector in a second direction orthogonal to the first direction. The circuitry is to control the mover to move the skew detector in the second direction to detect, multiple times, an end of the sheet medium in the second direction at a detection interval, and change the detection interval of multiple detections according to a size of the sheet medium, to detect the amount of skew of the sheet medium.