Printing Apparatus Sheet Winding Tension Control
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Solution Overview
Problem
Conventional printing apparatuses require users to manually apply tension and hold the sheet during winding, leading to user burden and potential loosening of the winding, especially at the trailing end.
Innovation Solution
A printing apparatus with a mount unit, driving unit, pressing member, and control unit that applies controlled pressing forces to the sheet, reducing user involvement in tension application and preventing loosening by maintaining a consistent pressing force during the winding process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a user manually applies tension to the sheet during winding, then the sheet can be fixed to the roll member, but the user burden increases and the operation becomes more complex
Solution Approach 1:
The pressing member automatically applies pressing force to the sheet during winding without requiring manual intervention. The control unit autonomously controls the pressing force based on the winding state, making the system self-sufficient and eliminating the need for users to manually apply tension.
Solution Approach 2:
The patent replaces the manual mechanical tension application with an automated pressing mechanism controlled by a control unit. The pressing member, driven by a motor or actuator, substitutes the human hand and arm mechanical action with an automated electromechanical system.
2Reliability
If the user holds the trailing end of the sheet by hand, then loosening of the winding is prevented, but the user burden increases
Solution Approach 1:
The pressing member continuously applies pressing force to the sheet during the entire winding process, including the trailing end, without requiring user intervention. This self-service mechanism ensures the sheet remains securely pressed against the roll member throughout winding.
Solution Approach 2:
The pressing force is applied continuously throughout the winding process rather than intermittently. The control unit maintains the pressing member in contact with the sheet from the leading end to the trailing end, ensuring continuous stabilization and preventing loosening at any point during winding.
3Reliability
If the pressing force is increased to prevent loosening, then winding stability improves, but the risk of sheet damage increases
Solution Approach 1:
The pressing force is dynamically adjusted based on the winding state. The control unit varies the pressing force magnitude according to the sheet tension, winding speed, and roll diameter, applying sufficient force to prevent loosening while avoiding excessive force that could damage the sheet.
Solution Approach 2:
The patent changes the pressing force parameter dynamically during the winding process. The control unit adjusts the pressing force magnitude and distribution based on real-time conditions, such as increasing force when the roll diameter increases or when sheet tension decreases, thereby maintaining optimal pressing force throughout the winding process.
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
The apparatus reduces user load during sheet winding by automating tension application and preventing loosening of the roll, ensuring stable and efficient sheet winding without manual intervention.
Implementation Method 1
a pressing member configured to press a surface of the roll sheet mounted on the mount unit
Data Source
AI summary
A printing apparatus includes: a printing unit configured to perform printing on a sheet; a driving unit configured to apply a rotational force to a roll member that is rotatably held; and a pressing unit having a roller configured to apply a pressing force to an outer peripheral surface of a roll sheet wound around the roll member, wherein the pressing unit changes the pressing force during a sequence in which the driving unit applies a rotational force to the roll member and a sheet that has passed through the printing unit is wound.