Rotary Cutter Multiple Blades Avoid Interference
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Solution Overview
Problem
The efficiency of existing rotary cutter devices is reduced when cutting a sheet-shaped object multiple times in sequence, as the single helical blade requires multiple revolutions, leading to potential interference with cut objects and hindered conveying.
Innovation Solution
A rotary cutter device with a rotating body featuring multiple parallel rotary blades and a fixed blade, where the blades are positioned to cut the object in a straight line while rotating, allowing for efficient cutting without interference by using a feed path that passes through the inner side of the blades' trajectory and intersects with the outer side for discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a plurality of helical blades are provided on the rotary cutter to cut the object multiple times per revolution, then cutting efficiency is improved, but the blades at non-cutting positions may interfere with the conveyed object
Solution Approach 1:
The rotary cutter is divided into multiple independent cutting zones, each with its own blade positioned at different angular locations. Each blade independently cuts the conveyed object at different positions along the conveyance path, enabling multiple cuts per revolution without interference between blades.
Solution Approach 2:
The problem is solved by transitioning from a single cutting plane to multiple cutting planes arranged radially around the rotary cutter axis. By positioning blades at different angular positions (adding the angular dimension), the system achieves multiple cuts per revolution while preventing blade interference through spatial separation.
2Object-affected harmful factors
If a single helical blade is provided on the rotary cutter, then blade interference is avoided, but the cutting efficiency is reduced due to requiring multiple revolutions
Solution Approach 1:
The single blade is segmented into multiple blades positioned at different angular locations on the rotary cutter. Each blade functions as an independent cutting element, allowing the system to perform multiple cuts during a single revolution, thereby improving productivity while maintaining controlled interference through proper positioning.
Solution Approach 2:
The rotary cutter is designed with multi-functionality by incorporating multiple blades that can simultaneously or sequentially cut the conveyed object. This enables the single rotary cutter to perform multiple cutting operations that would otherwise require multiple separate cutters or multiple revolutions.
Data Source
AI summary
A rotary cutter device includes a rotating body, a plurality of rotary blades, a fixed blade, a feeding portion, and a control portion. The rotating body is configured to be rotatable around a central axis. The plurality of rotary blades are provided on the rotating body. The fixed blade is provided facing a trajectory that cutting edges of the plurality of rotary blades describe when the plurality of rotary blades rotate. The feeding portion is configured to feed a sheet-shaped object along a linear feed path that passes close to the fixed blade. The control portion is configured to rotate the plurality of rotary blades around the central axis toward the fixed blade from the opposite side of the feed path from the fixed blade.