Rotary Cutting Mat Structure Without Rivets for Flat Cutting
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Solution Overview
Problem
Rotary cutting mats with rivet connections face issues of increased complexity and cost due to multi-layer structures and surface irregularities caused by buried rivet heads, leading to deflected cutting lines.
Innovation Solution
A rotary cutting mat design featuring a base plate and a rotatable mat connected via a shaft member inserted into a receiving portion on the base plate, eliminating the need for rivets and allowing for a flat surface without raised regions, thus simplifying manufacturing and maintaining cutting line accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a rivet member is used to connect the base plate and the rotary mat, then the connection strength is improved, but the structure becomes complicated and the manufacturing cost increases
Solution Approach 1:
The patent removes the rivet member from the connection system between the base plate and rotary mat. Instead of using a rivet that requires embedding and multi-layer structure, the invention uses a simple shaft member inserted into a receiving portion, eliminating the need for complex multi-layer construction and reducing manufacturing steps while maintaining rotational functionality.
Solution Approach 2:
Instead of embedding the connector (rivet) into the rotary mat structure, the invention inverts the approach by having the rotary mat rest on top of the base plate with the shaft member protruding from the base plate's receiving portion. This inversion eliminates the need to bury the connector head and simplifies the overall structure.
2Shape
If a rivet head is buried in the multi-layer structure, then the exposure of rivet head on the mat surface is prevented, but the number of components and manufacturing steps increases
Solution Approach 1:
The patent extracts the rivet head burial requirement from the design. By using a shaft member that protrudes from the base plate's receiving portion rather than embedding a rivet into the rotary mat, the invention eliminates the need for multi-layer construction and complex manufacturing steps while achieving the goal of preventing connector exposure on the working surface.
Solution Approach 2:
The connection system is segmented into distinct functional parts: the base plate with its receiving portion, the shaft member as a separate rotational axis, and the rotary mat as the working surface. This segmentation allows each component to be manufactured independently and assembled simply, reducing overall complexity.
3Strength
If a buried rivet is used in the rotary mat, then the connection is secured, but the upper surface of the mat becomes raised and cutting lines are deflected
Solution Approach 1:
The patent removes the source of surface irregularity by eliminating the buried rivet structure. The shaft member is positioned in the base plate's receiving portion, away from the rotary mat's upper working surface, ensuring that the mat surface remains perfectly flat for accurate cutting operations while the connection security is maintained through the shaft-receiving portion interface.
Solution Approach 2:
The receiving portion in the base plate acts as an intermediary structure that accommodates the shaft member. This intermediary design allows the connection to be secured without interfering with the flatness of the rotary mat's upper surface, as the connection mechanism is housed within the base plate rather than being embedded in the mat itself.
Data Source
AI summary
A rotary cutting mat of the present invention has a base plate and a rotary mat, which can be rotated relative to each other. The rotary mat is provided with a shaft member projected from a reverse side thereof. The base plate is provided with a receiving portion, which rotatably receives the shaft member of the rotary mat. Since the rotary mat is simply placed on the base plate with the shaft member being inserted in the receiving portion, there is no need of a rivet for connecting the rotary mat and the base plate. Thus, the constitution on the mat is simplified and the surface of the mat can be maintained flat without any buried rivet head in the mat.