Printer Roll Holder with State-Dependent Guide Braking
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Solution Overview
Problem
Existing printer holders for rolled paper struggle to balance user operability and reliable guidance, as they often apply the same braking force in both fallen and standing states, leading to a trade-off between ease of alignment and effective paper guidance.
Innovation Solution
A holder design with a shaft member, moving member, biasing member, and adjustment member, where the biasing member applies a larger pressure contact force in the standing state than in the fallen state, allowing for improved user operability and reliable paper guidance with a simplified configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple structure with spring pressing support shaft and guide together is used, then device complexity is reduced, but braking force is insufficient in fallen state for easy alignment
Solution Approach 1:
The guide is designed to be movable in the axial direction with respect to the support shaft, transitioning between a fallen state for alignment and a standing state for guidance. The biasing member applies different pressure contact forces in different states, making the system adaptive to operational requirements.
Solution Approach 2:
The biasing member (spring) changes the pressure contact force parameter based on the guide's position. In the fallen state, the spring applies smaller force to reduce braking force and ease alignment. In the standing state, the spring applies larger force to increase braking force and ensure reliable guidance.
2Reliability
If large braking force is applied to guide in standing state for reliable guidance, then paper guidance reliability is improved, but alignment ease in fallen state deteriorates
Solution Approach 1:
The guide transitions between fallen and standing states, and the biasing member dynamically adjusts the pressure contact force accordingly. This dynamic adjustment allows the system to optimize braking force for each operational state independently.
Solution Approach 2:
The biasing member changes the pressure contact force parameter between different states. The spring force is configured to be smaller when the guide is in the fallen state (facilitating alignment) and larger when the guide is in the standing state (ensuring reliable guidance).
3Device complexity
If same braking force is applied in both fallen and standing states, then device complexity is reduced, but trade-off between operability and guidance reliability occurs
Solution Approach 1:
The system transitions from a static braking force configuration to a dynamic one where the biasing member adjusts pressure contact force based on the guide's positional state. This allows different braking forces in different operational contexts without adding complex control mechanisms.
Solution Approach 2:
The biasing member (spring) automatically adjusts the pressure contact force based on the guide's position without requiring external control. The spring naturally provides different forces in fallen and standing states, making the system self-regulating.
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 holder achieves enhanced user operability by reducing the necessary adjustment force for aligning the guide member and ensures reliable paper guidance by increasing braking force in the standing state, while maintaining a straightforward structure.
Implementation Method 1
a biasing member that presses the shaft member and the moving member together to restrain sliding movement of the moving member with respect to the shaft member
Implementation Method 2
the braking force applied to the guide is the same in both the fallen state and the standing state
Data Source
AI summary
In accordance with an embodiment, a printer according to the embodiment includes: a holder of a rolled print medium. The holder includes a moving member that is provided to be slidable on a shaft member to be inserted through a support hole of the rolled print medium in an axial direction and includes a guide member that can stand and fall with respect to the shaft member. Further, the holder includes an adjustment member that makes a pressure contact force of a biasing member that presses the shaft member and the moving member together to restrain sliding movement of the moving member with respect to the shaft member larger in a standing state of the guide member than in a fallen state of the guide member.