Recording Roller Speed Sequencing for Continuous Sheet Tension Stability
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Solution Overview
Problem
Existing recording apparatuses experience significant tension fluctuations and increased time to stabilize sheet conveyance speed, leading to misprinting issues when transitioning from a stopped state to a recording speed.
Innovation Solution
A recording apparatus with a control unit that manages the speeds of first and second conveyance rollers, starting with the second roller at a slower speed, then increasing the second roller speed and finally accelerating the first roller to a lower speed than the second, stabilizing tension through controlled torque and speed adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the infeed roller is reversely rotated to remove sheet slack before acceleration, then the sheet tension is stabilized, but the tension variation increases during transition from reverse rotation to normal rotation
Solution Approach 1:
The patent applies preliminary action by reversing the infeed roller rotation before acceleration to remove sheet slack and stabilize tension. This preliminary reverse rotation ensures the sheet is properly tensioned before the roller switches to normal rotation and acceleration begins, preventing tension variations during the transition.
2Speed
If the speed of the infeed roller is increased to recording speed, then the recording operation can start, but the time to settle down to predetermined tension value increases
Solution Approach 1:
The patent performs preliminary reverse rotation of the infeed roller before acceleration to pre-stabilize sheet tension. This preliminary action ensures that when the roller accelerates to recording speed, the tension is already stabilized, reducing the time needed to reach the predetermined tension value.
Solution Approach 2:
The control unit monitors sheet tension in real-time and adjusts the infeed roller speed and reverse rotation accordingly. This feedback mechanism ensures the tension stabilizes quickly and accurately, reducing the time to reach the target tension value while maintaining recording speed.
3Stability of the object's composition
If torque lower limit restriction is imposed on clutch control, then tension hunting is suppressed, but the time to reach prescribed tension value increases
Solution Approach 1:
The control unit implements feedback control by monitoring sheet tension and dynamically adjusting clutch torque output. This feedback mechanism allows the system to reach the prescribed tension value faster while suppressing tension hunting through continuous adjustment, eliminating the need for fixed torque lower limit restrictions.
Data Source
AI summary
With a recording apparatus for performing recording onto a continuous sheet to be conveyed, for starting conveyance of the continuous sheet, control is started so that with a first conveyance roller for conveying the continuous sheet on the upstream side of a recording portion in a conveyance path of a continuous sheet being stopped, the speed of a second conveyance roller for conveying the continuous sheet on the downstream side of the recording portion in the conveyance path becomes a first speed, and control is changed so that the speed of the second conveyance roller becomes a second speed faster than the first speed, and moreover control of the first conveyance roller is started so that the speed of the first conveyance roller may become a third speed faster than the first speed and slower than the second speed.