Sheet Conveyance Drive Correction for Tension-Induced Slippage
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Solution Overview
Problem
In recording apparatuses, the conveyance length of continuous sheets can deviate from target values due to slippage caused by varying tension as the sheet is spooled, leading to reduced printing quality, especially when the remaining amount of the rolled sheet affects the inertia brake, resulting in inconsistent braking force and tension.
Innovation Solution
A sheet conveying device that applies tension downstream of the conveying unit and adjusts the driving amount per unit conveyance distance based on the tension applied, using a control unit to correct for slippage by determining appropriate drive correction values based on the diameters of the feeding and roll-up sheet rolls and medium width, ensuring the conveyance distance aligns with the target value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If tension is applied to the continuous sheet during conveyance, then the sheet can be spooled and handled more effectively, but slippage occurs due to varying tension causing conveyance length deviation
Solution Approach 1:
The control unit pre-calculates and determines the appropriate driving amount correction value based on the remaining amount of rolled sheet before conveyance begins. This preliminary correction compensates for the varying tension effects that will occur during conveyance, ensuring accurate conveyance length from the start
Solution Approach 2:
The system uses feedback from the remaining amount detection to continuously adjust the driving amount correction. By monitoring how much sheet remains on the roll and corresponding tension changes, the control unit dynamically corrects the driving amount to maintain precise conveyance length throughout the entire spooling process
2Device complexity
If constant torque is applied by the torque limiter during spooling, then the spooling operation is simplified, but tension varies as diameter changes causing conveyance deviation
Solution Approach 1:
The system changes the driving amount parameter based on the remaining amount of rolled sheet. As the sheet diameter decreases during spooling, the control unit adjusts the driving amount correction value to compensate for the changing tension conditions, maintaining constant conveyance length accuracy throughout the process
3Quantity of substance
If the remaining amount of rolled sheet is large, then more material is available for conveyance, but slippage increases due to inertia brake effect
Solution Approach 1:
Before conveyance begins, the control unit determines the appropriate driving amount correction based on the detected remaining amount of rolled sheet. For large remaining amounts where inertia brake causes significant slippage, the system pre-applies a larger correction value to compensate for the expected slippage during conveyance
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution effectively prevents slippage and maintains high-quality printing by accurately setting the conveyance distance, regardless of the sheet's diameter and remaining amount, thereby ensuring consistent printing quality across different medium widths and diameters.
Implementation Method 1
a tension applying unit configured to apply tension to the continuous sheet downstream of the conveying unit in a conveying direction
Implementation Method 2
the surface of the sheet may slip on a conveyer part, causing the conveyance length to deviate from a target value
Implementation Method 3
when the remaining amount of the rolled sheet is large, the slippage is large due to the effect of the inertia brake of the rolled sheet
Data Source
AI summary
A sheet conveying device having a rolled-sheet supporting unit, a conveying unit, a driving unit, a tension applying unit, and a control unit. The rolled-sheet supporting unit supports a continuous sheet rolled up into a roll. The conveying unit conveys the continuous sheet from the rolled-sheet supporting unit as driven by the driving unit. The tension applying unit applies tension to the continuous sheet downstream of the conveying unit in a conveying direction. The control unit controls a driving amount of the driving unit per unit conveyance distance as the conveying unit conveys the continuous sheet. The driving amount is larger in a case where a first tension is applied by the tension applying unit compared to a case in which a second tension, that is larger than the first tension, is applied.