Involute Curve Cutting Blade for High Precision Medium Trimming
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Solution Overview
Problem
Existing image forming apparatuses face challenges in achieving high accuracy during medium cutting operations.
Innovation Solution
A medium cutting device with a cutting blade featuring an involute curve edge, where path lengths from the sandwiching part to the edge are substantially constant, ensuring precise cutting by distributing stress evenly across the medium.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional straight edge cutting blade is used, then the cutting operation is simple, but the cutting accuracy is insufficient and the leading edge surface is not sharp
Solution Approach 1:
The cutting blade edge is designed with a specific curved profile rather than a straight line. The edge includes a curved portion that contacts the medium first during cutting, followed by a straight portion. This curvature allows the blade to progressively cut through the medium from the curved side toward the center, ensuring a sharp leading edge surface and high cutting accuracy while maintaining operational simplicity
Solution Approach 2:
Different portions of the blade edge have different geometric properties optimized for specific cutting functions. The curved portion at one end is designed to initiate the cut and create the leading edge, while the straight portion completes the cut. This local differentiation of edge geometry enables precise control over the cutting process and resulting edge quality
2Manufacturing precision
If the cutting blade contacts the medium at multiple points simultaneously, then the cutting operation is fast, but the stress distribution is uneven causing inaccurate cutting
Solution Approach 1:
The curved portion of the blade edge ensures sequential contact with the medium during the cutting stroke. As the blade moves through the medium, the curved geometry naturally progresses the contact point from one end toward the center, creating even stress distribution throughout the cutting process. This maintains cutting accuracy while the overall blade motion ensures efficient cutting speed
Data Source
AI summary
A medium cutting device cutting a continuous medium carried along a carrying path in a carrying direction includes a sandwiching part that is provided capable of sandwiching a medium; and a cutting blade that includes an edge extending in a width direction (X) of the medium, which is perpendicular to the carrying direction, wherein the medium is cut by the edge while the medium is sandwiched and held by the sandwiching part. Wherein the edge is in a shape depicting an involute curve in which path lengths (PL) of the medium, which are determined from the sandwiching part to the edge in the carrying direction, are substantially constant over the edge in the width direction.