Compact Cutter Unit with Guide Groove and Drive Pin
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Solution Overview
Problem
Existing printing apparatuses with cutter blades and worm wheels struggle to minimize size due to the complexity of gear engagement systems.
Innovation Solution
A printing apparatus with a cutter unit featuring a first blade that moves between a standby and cutting position, driven by a rotating cylindrical body with a guide groove and a single drive pin, which simplifies the mechanism by eliminating the need for symmetrical drive points, allowing for a compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two or more gears are engaged with a cutter blade, then the cutting function is reliable, but the apparatus size cannot be reduced
Solution Approach 1:
The patent extracts the engagement interface from the blade itself and relocates it to a separate drive pin component. The guide groove is formed on the rotating body, and the drive pin with protrusion engages with this groove, separating the driving function from the cutting blade. This allows for a more compact arrangement as the drive pin can be positioned optimally without adding to the overall apparatus volume.
Solution Approach 2:
The drive pin acts as an intermediary component between the rotating body and the cutter blade. The protrusion on the drive pin engages with the guide groove on the rotating body, transmitting rotational motion to move the blade. This intermediary mechanism allows for reliable power transmission while enabling a compact design, as the drive pin serves as a space-efficient coupling element.
2Reliability
If a complex gear engagement system is used, then the cutting mechanism is robust, but the device complexity increases
Solution Approach 1:
The patent extracts the complex gear engagement system and replaces it with a simplified guide groove and drive pin mechanism. The guide groove is formed directly on the rotating body, and the drive pin with protrusion engages with this groove, eliminating the need for multiple gears and reducing mechanical complexity while maintaining reliable blade actuation.
Solution Approach 2:
The rotating body serves multiple functions: it stores rotational energy, provides the guide groove for engagement, and directly actuates the blade through the drive pin. This multi-functional design eliminates the need for separate gear components, reducing device complexity while maintaining robust cutting mechanism functionality.
3Stability of the object's composition
If symmetrical drive points are provided on the blade, then the load distribution is balanced, but the apparatus size increases
Solution Approach 1:
The patent employs asymmetry by providing a single drive pin with one protrusion that engages with the guide groove, rather than using symmetrical drive points. The guide groove is positioned at a specific location on the rotating body, creating an asymmetric engagement that achieves balanced load distribution through proper mechanical design while minimizing apparatus size.
Solution Approach 2:
The patent merges the drive pin and the blade into a integrated cutter unit, where the drive pin is positioned to directly actuate the blade through the guide groove mechanism. This merging eliminates the need for separate symmetrical drive points on the blade, as the single drive pin engagement is sufficient to provide balanced load distribution while reducing overall apparatus volume.
Data Source
AI summary
A printing apparatus includes a cutter unit that includes a first blade that moves in a first direction from a standby position to a cutting position to cut a printing medium and a drive pin that moves integrally with the first blade, a drive cam which has a cylindrical shape and on a side surface of which a guide groove engaged with the drive pin is provided, and a driving motor that rotates the drive cam, in which, when the drive cam rotates, the guide groove guides, via the drive pin, the first blade in the first direction from the standby position to the cutting position.