Cam-Actuated Roll Holding Device for Easy Core-Pipe Insertion
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Solution Overview
Problem
Existing roll holding devices face increased insertion resistance due to the elastic force of leaf springs and size variation of roll paper, particularly when the inner diameter of the core pipe is small, leading to potential tilting and displacement of the roll paper during feeding.
Innovation Solution
A roll holding device with a cam member that pivots between a pressing and retraction position, combined with fitting members that contact the inner wall of the core pipe, to stabilize the roll paper and reduce tilting, while allowing easy insertion and mounting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a leaf spring is provided to each fitting portion to hold the roll paper, then the roll paper can be held securely, but the elastic force of the leaf spring creates great resistance to insertion, particularly when the core pipe inner diameter is small
Solution Approach 1:
The fitting member is designed to dynamically change its state between a pressed state (when inserted) and a retracted state (when not inserted). The cam member enables this dynamic transition, allowing the fitting member to be pressed against the inner wall for secure holding, and retracted for easy insertion. This dynamic mechanism resolves the contradiction by making the holding force active only when needed.
Solution Approach 2:
The cam member is configured to preliminarily press the fitting member against the inner wall before the fitting portion is fully inserted. This preliminary action ensures that the roll paper is secured during the insertion process, preventing displacement while minimizing the resistance encountered during insertion.
2Volume of moving object
If the inner diameter of the core pipe is reduced to accommodate size variations in roll paper, then the device becomes more compact, but the insertion resistance increases due to the smaller clearance
Solution Approach 1:
The dynamic pressing mechanism allows the system to maintain a compact core pipe inner diameter while overcoming the increased insertion resistance. The fitting member is pressed against the inner wall only when needed for holding, and retracted during insertion to reduce friction and resistance, enabling easy insertion even with a small clearance.
Solution Approach 2:
The cam member performs preliminary pressing of the fitting member to ensure secure contact with the inner wall before full insertion. This preliminary action compensates for the small clearance by establishing firm contact early in the insertion process, preventing any potential displacement while maintaining device compactness.
3Stability of the object's composition
If the fitting portion is inserted deeply into the core pipe to prevent tilting, then the roll paper stability improves, but the insertion resistance and mounting difficulty increase
Solution Approach 1:
The cam member performs preliminary pressing of the fitting member against the inner wall during the insertion process. This ensures that the roll paper is stabilized early, preventing tilting as the fitting portion is inserted to the appropriate depth, thereby achieving stability without excessive insertion depth or complexity.
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 solution effectively suppresses tilting and facilitates easy mounting of roll paper, ensuring stable feeding and reducing mechanical complexity and cost, while maintaining the device's compactness and weight efficiency.
Implementation Method 1
a leaf spring is provided to each of the above-described fitting portions inserted into the roll paper core pipe, and the roll paper is held by the elastic force of this leaf spring
Data Source
AI summary
Provided is a printing apparatus for performing printing on a sheet drawn out from a roll including: a roll holding unit configured to hold the roll; a support unit configured to rotatably support the roll holding unit; a core portion provided to the roll holding unit and configured to be inserted into a hollow portion of a core pipe of the roll from an end portion of the core pipe to extend along an axis of the core pipe; a contact member provided to the core portion and configured to be put in contact with an inner wall surrounding the hollow portion of the core pipe; and a cam member disposed inside the core portion and configured to pivot to a first position where the contact member is pressed onto the inner wall and to a second position where the contact member is retracted from the inner wall.