Sheet Transport Controller Tension Control
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Solution Overview
Problem
Conventional sheet transporting systems face challenges in achieving high-precision control of sheet tension and state quantities, particularly with short sheets like standard paper sizes, due to excessive load causing slippage between rollers and inadequate control mechanisms.
Innovation Solution
A controller system that calculates and sets control inputs for multiple rollers to manage sheet tension and state quantities by using the sum and difference of control inputs for each roller, allowing precise control of sheet speed and tension, and incorporates a setting unit to adjust target tension based on sheet position and type.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional single-roller tension control is used, then the control system is simple, but high-precision control of sheet tension cannot be achieved
Solution Approach 1:
The patent divides the tension control function across multiple rollers (send-out roller and transporting roller) rather than relying on a single roller. Each roller is equipped with its own driving device and can be independently controlled, allowing the tension control system to be segmented into multiple control points along the sheet transport path. This segmentation enables more precise tension control while distributing the control complexity across multiple manageable components.
Solution Approach 2:
The patent transitions from one-dimensional tension control (single roller) to two-dimensional control by adding both positional dimension (multiple rollers at different locations) and control variable dimension (independent driving control for each roller). This dimensional expansion allows the system to control tension more precisely by adjusting parameters at multiple points simultaneously.
2Speed
If excessive load is applied to short sheets, then the sheet can be transported, but slippage occurs between rollers and sheet
Solution Approach 1:
The patent implements dynamic control of roller speeds and tensions by independently adjusting the driving devices of multiple rollers based on real-time sheet position and tension feedback. This dynamic adjustment allows the system to optimize the force distribution between rollers and sheet, preventing excessive load at any single point while maintaining transport speed. The dynamic control adapts to changing conditions throughout the transport cycle.
Solution Approach 2:
The patent changes operational parameters (roller speeds, driving forces) along the transport path by controlling different rollers with different parameters. The controller adjusts speed and tension parameters dynamically based on sheet position, allowing optimal parameter settings at each location to prevent slippage while maintaining overall transport efficiency.
3Adaptability or versatility
If multiple rollers are used for sheet transport, then transport flexibility increases, but control of state quantity and tension becomes more difficult
Solution Approach 1:
The patent implements feedback control by continuously monitoring sheet position, speed, and tension, and using this information to adjust the driving devices of multiple rollers. The controller receives feedback from sensors and dynamically adjusts roller parameters to maintain optimal transport conditions. This feedback mechanism manages the complexity of controlling multiple rollers by providing real-time information for coordinated adjustment.
Solution Approach 2:
The patent creates a universal control architecture where the controller manages multiple rollers with similar driving devices and control interfaces. This universal approach allows the same control logic to be applied across different rollers, simplifying the management of complexity. The multi-functional system can handle various sheet types and transport requirements using the same basic control framework.
Data Source
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AI summary
There is provided a transporting system including two rollers to transport a sheet, two driving devices to drive the rollers, two measuring devices to measure state quantities Z1 and Z2 concerning the rollers, and a controller to control the transport of the sheet. The controller includes first and second estimating units to estimate reaction forces R1 and R2 act on the rollers, a first calculating unit to calculate control input U1 in accordance with a deviation between a target state quantity and (Z1 + Z2)/2, a second calculating unit to calculate control input U2 in accordance with a deviation between a target tension and (R1 - R2)/2, a first drive controller to input a control signal in accordance with (U1 + U2) to the first driving device, and a second drive controller to input a control signal in accordance with (U1 - U2) to the second driving device.