Movable Blade Shearing-Angle Variation for Flexible Sheet Cutting
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Solution Overview
Problem
Conventional cutting devices experience cutting malfunctions when using softer printing media due to uneven rubbing loads and insufficient cutting force at the center portion of the V-shaped cutting edge.
Innovation Solution
A cutting device with a movable blade having a second blade edge portion with a larger shearing angle at the center than at the end portions, and a pressing member to ensure stable rubbing load throughout the cutting process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the pressing member is fixed to the frame to apply pressing force to the movable blade, then the pressing force is applied to the lower portion of the movable blade, but the rubbing load at the center portion becomes insufficient when softer printing media is used
Solution Approach 1:
The second blade edge portion is designed with different shearing angles at different locations: a larger shearing angle at the center portion and smaller shearing angles at the end portions. This local differentiation of geometric properties ensures that the center portion generates sufficient rubbing load for softer materials while the end portions maintain appropriate cutting characteristics.
Solution Approach 2:
The shearing angle parameter is changed along the length of the second blade edge portion. By making the shearing angle at the center portion larger than at the end portions, the rubbing load distribution is optimized to prevent cutting malfunction when processing softer printing media.
2Productivity
If the movable blade is moved upward during cutting, then the cutting progresses from widthwise ends toward the center, but the two points of contact approach each other causing greater difference in rubbing loads
Solution Approach 1:
The second blade edge portion is designed with different shearing angles at different locations: a larger shearing angle at the center portion and smaller shearing angles at the end portions. This local differentiation of geometric properties ensures that the center portion generates sufficient rubbing load for softer materials while the end portions maintain appropriate cutting characteristics.
Solution Approach 2:
The shearing angle parameter is changed along the length of the second blade edge portion. By making the shearing angle at the center portion larger than at the end portions, the rubbing load distribution is optimized to prevent cutting malfunction when processing softer printing media.
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 device stabilizes rubbing load and ensures proper cutting of flexible sheets by maintaining sufficient cutting force, even as the pressing force varies, thereby preventing cutting malfunctions.
Implementation Method 1
the cutting edge of the movable blade and the cutting edge of the fixed blade rub against each other at two points of contact to thereby generate rubbing load
Implementation Method 2
The pressing member is fixed to the frame to urge the movable blade toward the fixed blade such that the cutting edge of the movable blade and the cutting edge of the fixed blade rub against each other
Data Source
AI summary
A cutting device includes: a frame; a fixed blade including a first blade edge portion extending in an extending direction; a movable blade movable in a moving direction; a driving mechanism; and a pressing member. The movable blade includes: a second blade edge portion; and a contacting portion. The second blade edge portion has a valley-like shape such that a center portion in the extending direction thereof is closer to the contacting portion than end portions in the extending direction thereof are to the contacting portion. The second blade edge portion has shearing angles that are inclination angles relative to the extending direction. The shearing angles includes a first shearing angle that is the shearing angle at each end portion and a second shearing angle that is the shearing angle at the center portion. The second shearing angle is larger than the first shearing angle.