Movable Blade Corner Design for Sheet Cutter Durability
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Solution Overview
Problem
Existing sheet material cutters face issues with durability and incomplete cutting due to edge nicks and uneven cutting residual portions, particularly when using V-shaped blades with cutout grooves or slant surfaces, leading to torn sheets and increased processing complexity.
Innovation Solution
A sheet material cutter design featuring a fixed blade and a movable blade with a cutout groove formed at a fixed depth and a slant or curved surface at the corner portion where the blades intersect, reducing edge nicks and ensuring smooth cutting residual formation by maintaining blade thickness and ease of processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a cutout groove is formed in the movable blade to enable partial cutting, then partial cutting function is achieved, but the sheet material is torn off and broken at the opening end portion of the cutout groove
Solution Approach 1:
The movable blade is segmented into multiple functional portions: a cutting portion with a straight end face for clean cutting, a reinforcement portion at the opening end of the cutout groove to prevent tearing, and the cutout groove itself for partial cutting functionality. This segmentation allows each portion to address specific requirements without compromising overall performance.
Solution Approach 2:
Different regions of the movable blade are given different structural characteristics: the cutting portion has a straight end face orthogonal to the blade surface for durability and clean cutting, while the reinforcement portion has a specific shape designed to prevent sheet material from being torn off at the cutout groove opening. This local differentiation resolves the contradiction between enabling partial cutting and maintaining cutting quality.
2Adaptability or versatility
If the cutting portion is formed on the slant surface to enable partial cutting, then partial cutting is achieved, but the edge of the cutting portion is liable to be nicked and durability is lowered
Solution Approach 1:
The movable blade is divided into distinct segments: a cutting portion with a straight end face orthogonal to the blade surface for enhanced durability, and a reinforcement portion with specific geometric features for partial cutting. This segmentation allows the cutting portion to focus on durability while the reinforcement portion enables partial cutting functionality.
Solution Approach 2:
Instead of forming the cutting portion on the slant surface as in conventional designs, the invention inverts the approach by creating a straight end face orthogonal to the blade surface. The partial cutting functionality is then achieved through the reinforcement portion with the cutout groove, rather than through the cutting portion geometry itself. This inversion resolves the contradiction between partial cutting capability and blade durability.
3Ease of operation
If a pointed portion is formed by processing the slant surface to smoothly start cutting, then cutting operation starts smoothly, but cumbersome polishing work is required and manufacturing complexity increases
Solution Approach 1:
The movable blade is segmented into a cutting portion with a straight end face and a reinforcement portion containing the cutout groove. The reinforcement portion includes specific geometric features that enable smooth sheet insertion without requiring extensive polishing of the cutting portion, thus reducing manufacturing complexity while maintaining operational smoothness.
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 design enhances durability and achieves clean, linear cutting residual portions without edge nicks, ensuring effective partial and full cutting operations while simplifying processing and reducing the risk of sheet tearing.
Implementation Method 1
a movable blade is brought into sliding contact with a fixed blade to cut a sheet material
Data Source
AI summary
A fixed blade and a movable blade in which a cutting portion end face of the movable blade is orthogonal to a side surface of the movable blade, and the movable blade is brought into sliding contact with the fixed blade to cut a recording sheet. A cutout groove for forming a cutting residual portion in the recording sheet is formed in the cutting portion of the movable blade. A slant surface or a curved surface is formed at an intersection of the side surface of the movable blade, a cutting portion end face of the movable blade and the inner peripheral surface of the cutout groove.