Ball Screw Cutter Drive for Continuous Web Cutting in Compact Space
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Solution Overview
Problem
Existing cutting devices that cut webs in a direction intersecting the transportation direction require large placement spaces, especially when the transportation distance is long, making it difficult to achieve cutting without interrupting web transport while minimizing space usage.
Innovation Solution
A cutting device equipped with a ball screw mechanism that moves a cutter in the transportation direction of the web, allowing the cutter to cut the web in a direction intersecting the transportation direction without interrupting the web's transport, even at longer distances, by using a ball screw mechanism with a long stroke.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a crank mechanism is used to move the cutter in the transportation direction, then the web can be cut in a direction intersecting the transportation direction without interrupting the transportation, but the placement space becomes large when the transportation distance is long
Solution Approach 1:
The patent replaces the crank mechanism with a ball screw mechanism to move the cutter in the transportation direction. The ball screw mechanism converts rotational motion to linear motion with high precision and efficiency, enabling the cutter to traverse long distances along the web transportation path without requiring large placement space. This substitution resolves the contradiction by maintaining continuous cutting capability while significantly reducing the spatial footprint compared to a crank mechanism.
Solution Approach 2:
The patent employs a dynamically adjustable cutting system where the cutter can move along the transportation direction to adapt to different cutting positions. The ball screw mechanism enables precise dynamic positioning of the cutter at any point along the web, allowing continuous cutting operations without interrupting web transport. This dynamic capability resolves the contradiction by providing flexible cutting positions within a compact mechanism footprint.
2Length of moving object
If the transportation distance during cutting operation is increased, then the cutting coverage is improved, but the crank mechanism becomes larger requiring more placement space
Solution Approach 1:
The patent substitutes the crank mechanism with a ball screw mechanism that can achieve long linear travel distances in a compact configuration. The ball screw's threaded structure allows the cutter to move along the transportation direction over extended distances while the mechanism itself occupies minimal space. This resolves the contradiction by decoupling the cutting coverage distance from the placement space requirement.
Solution Approach 2:
The patent reorients the cutting mechanism to move primarily in the transportation direction (one dimension) rather than using a crank's rotational plane. The ball screw mechanism aligns with the web transportation axis, enabling the cutter to traverse the full length of the web in the direction of motion. This dimensional alignment resolves the contradiction by maximizing cutting coverage along the transportation path while minimizing the mechanism's footprint in perpendicular directions.
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
This configuration enables cutting in a direction intersecting the transportation direction without interrupting web transport, while minimizing the required placement space, even for longer transportation distances, by utilizing a ball screw mechanism with a long stroke.
Implementation Method 1
a ball screw mechanism configured to move the cutter in a transportation direction of the web
Data Source
AI summary
A cutting device includes a cutter configured to cut a web including at least accumulated fibers and a ball screw mechanism configured to move the cutter in a transportation direction of the web, and the cutter, when the web is being transported, cuts the web in a direction intersecting the transportation direction while being moved in the transportation direction of the web by the ball screw mechanism.