Roll Paper Printer Cutter Blade Positioning Mechanism
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Solution Overview
Problem
Conventional printers using roll paper require a complex structure and increased size due to the need for a cover and interlocking mechanism to prevent the curled tip of the roll paper from deviating from the paper passage, complicating the printer's design and functionality.
Innovation Solution
A printer design featuring a casing with an accommodating part for roll paper, a printing device, a cutter with a stationary and movable blade, and a guide member that includes a driving device and controller to move the movable blade to a third position, ensuring the roll paper is properly aligned and cut without the need for a dedicated cover mechanism, simplifying the structure and reducing size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cover and interlocking mechanism are provided to prevent the roll paper tip from deviating, then the paper passage is protected, but the printer structure becomes complicated and larger
Solution Approach 1:
The patent removes the cover and interlocking mechanism from the printer structure. Instead, it uses the cutter blades themselves to guide and prevent deviation of the roll paper tip, thereby achieving the protective function without the additional components that complicated the structure.
Solution Approach 2:
The cutter blades serve dual functions: they both cut the roll paper and simultaneously guide/prevent deviation of the paper tip during the cutting process. This eliminates the need for separate cover mechanisms, reducing structural complexity while maintaining reliability.
2Reliability
If a cover and interlocking mechanism are provided to prevent the roll paper tip from deviating, then the paper passage is protected, but the printer size increases
Solution Approach 1:
The patent eliminates the cover mechanism that would increase printer volume. The cutter assembly itself provides the necessary guidance and protection functions, allowing the printer to maintain a compact size while preventing paper tip deviation.
Solution Approach 2:
The guiding function is merged into the cutter blade structure. The stationary and movable blades work together to both cut the paper and guide its position, combining multiple functions into a single component to reduce overall printer volume.
3Productivity
If the movable blade is positioned to cut the roll paper, then cutting function is achieved, but the tip end part may deviate into the blade setting space
Solution Approach 1:
The stationary blade acts as an intermediary guiding element between the paper passage and the movable blade. It provides a reference surface that prevents the paper tip from deviating into the blade setting space while allowing the movable blade to perform cutting operations.
Solution Approach 2:
The cutter assembly uses asymmetric positioning where the stationary blade is fixed in a specific location to provide guidance, while the movable blade operates independently for cutting. This asymmetric arrangement ensures proper paper alignment during the cutting process.
Data Source
AI summary
A printer has a roll of a paper and a cutter. The cutter includes a stationary blade provided and a movable blade. The movable blade is movable in an up-down direction with respect to the stationary blade between a first position and a second position. The stationary-side cutting tooth is located at a position higher than a guide surface. The movable-side cutting tooth is located, with respect to the guide surface, at a lower position when the movable blade is located at the first position, at a higher position when located at the second position, and at a third position, which is between the first and second positions, when the roll is attached to an accommodating part of the printer. When located at the third position, at least a part of the movable-side cutting tooth is located at a higher position than the lower end of the guide surface.