Sheet Skew Correction Using Adaptive Speed-Gap Transport Control
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Solution Overview
Problem
Existing sheet transporting devices face challenges in achieving high accuracy in correcting sheet skew, particularly with longer sheets or sheets with different characteristics such as greater basis weight or surface irregularities, leading to incomplete skew correction.
Innovation Solution
A sheet transporting device with a skew correcting component that adjusts speed-gap driving based on characteristics relevant to sheet transport, such as length, basis weight, and material, using independently controllable driving rolls to correct skew by decelerating or accelerating with a time gap, and a changing component to adjust the deceleration period accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a fixed speed-gap driving profile is used for skew correction, then the correction process is simple and fast, but the skew correction accuracy deteriorates for longer sheets and those with higher basis weights or surface irregularities
Solution Approach 1:
The patent applies dynamics by making the speed-gap driving profile adjustable based on sheet characteristics. The control unit dynamically modifies the driving speeds and time periods of the transporting components according to detected sheet length, basis weight, and surface properties, transforming a static control system into a dynamic one that adapts to different sheet types to maintain high skew correction accuracy
Solution Approach 2:
The patent implements parameter changes by modifying the driving parameters (speeds and time periods) of the transporting components based on sheet characteristics. The control unit adjusts these parameters according to detected variations in sheet length, basis weight, and surface properties, enabling the system to optimize skew correction for each specific sheet type without requiring complex mechanical restructuring
2Productivity
If the speed gap between transporting components is increased to correct skew faster, then productivity improves, but contact resistance increases causing incomplete skew correction for certain sheet types
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the speed gap between transporting components based on sheet characteristics. For sheets with higher basis weights or surface irregularities, the control unit reduces the speed gap to prevent excessive contact resistance, while for standard sheets, it maintains a larger speed gap to ensure fast correction, thus balancing productivity and reliability
Solution Approach 2:
The system uses dynamics by making the speed gap adjustable in real-time based on detected sheet properties. The control unit continuously monitors sheet characteristics and dynamically modifies the driving speeds of transporting components, transforming a fixed-speed system into an adaptive one that optimizes the balance between correction speed and contact resistance for each sheet type
3Manufacturing precision
If the time period for deceleration is extended to improve skew correction accuracy, then manufacturing precision improves, but the correction time increases reducing productivity
Solution Approach 1:
The patent implements parameter changes by adjusting the deceleration time period based on sheet characteristics. For longer sheets or those with higher basis weights, the control unit extends the deceleration time to ensure accurate skew correction, while for standard sheets, it uses a shorter deceleration period to minimize correction time, thus optimizing the balance between precision and efficiency for each specific case
Data Source
AI summary
A sheet transporting device includes: a skew correcting component configured to correct any skew of a sheet by executing speed-gap driving in which first and second transporting components that are arranged at respective positions in a direction intersecting a direction of sheet transport are driven for a predetermined time period with a speed gap between the first and second transporting components; and a changing component configured to change, with reference to a characteristic relevant to sheet transport, a state of the speed-gap driving of the skew correcting component.