Adjustable Roller Skew Correction for Sheet Transport
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Solution Overview
Problem
Conventional sheet carrying devices require complex configurations to achieve high accuracy in skew correction, which complicates the device setup.
Innovation Solution
A sheet carrying device with first and second rollers that can be separately driven, paired with sensors and control units to determine and correct skew, allowing for accurate skew adjustment without a complex configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple pairs of rollers are arranged at positions corresponding to various sheet widths and are switched in accordance with sheet width, then skew correction accuracy is improved, but device complexity increases
Solution Approach 1:
The patent applies the dynamics principle by making the roller spacing adjustable rather than fixed. The distance between the first and second rollers can be dynamically changed in the sheet width direction according to the actual sheet width being processed. This allows a single roller pair to adapt to various sheet widths, eliminating the need for multiple fixed roller pairs while maintaining high skew correction accuracy across different sheet sizes.
2Adaptability or versatility
If adjustment mechanism for roller spacing is added to accommodate various sheet widths, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent implements universality by designing a single roller pair that can perform skew correction for sheets of various widths. The adjustable spacing mechanism allows this universal roller pair to adapt to different sheet widths, replacing the need for multiple specialized roller pairs. Each roller serves multiple functions across different operating conditions, simplifying the overall device structure while maintaining versatility.
Data Source
AI summary
A technique is provided that can realize highly accurate skew correction without employing any particularly complicated device configuration. The quantity of skew of a sheet is determined in accordance with a detection result from a first pair of sensors. Driving of each of first rollers and second rollers is separately controlled to carry the sheet in such a manner as to reduce the quantity of skew determined in accordance with the detection result from the first pair of sensors. The quantity of skew of the sheet is determined in accordance with a detection result from a second pair of sensors. Driving of each of the first rollers and the second rollers is separately controlled to carry the sheet in such a manner as to reduce the quantity of skew determined in accordance with the detection result from the second pair of sensors.