Rotary Paper Creasing Groove Geometry to Prevent Edge Cutting
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Solution Overview
Problem
Existing rotary creasing devices for paper are prone to cutting the paper due to concentrated stress at the edge of the paper where the rotary blade contacts the groove, requiring complex configurations to adjust the blade height, which increases manufacturing costs.
Innovation Solution
A paper creasing device with a receiving member and rotary blade that moves along a groove, applying different shearing forces to the paper by having wider and narrower groove widths and heights to prevent cutting, using a simple configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a rotary blade is used to form creases in stiff paper, then creasing effectiveness is improved, but paper cutting occurs due to concentrated stress at the contact point
Solution Approach 1:
The groove width is made non-uniform, being wider at the entrance and narrower at the exit. This local variation in groove geometry creates different shearing force conditions at different locations, reducing concentrated stress at the paper edge while maintaining effective creasing in the center region.
2Object-affected harmful factors
If the height of the rotary blade is changed to reduce shearing force at paper edges, then paper cutting is prevented, but device complexity and manufacturing cost increase
Solution Approach 1:
Instead of changing the rotary blade height (which would require complex mechanisms), the groove width is varied locally. This simpler modification achieves the same effect of reducing edge shearing force without requiring blade height adjustment mechanisms, thereby avoiding increased device complexity.
3Reliability
If a rotary creasing device is used on stiff paper, then crease formation is effective, but the paper is likely to be cut due to concentrated stress
Solution Approach 1:
The groove width parameter is changed from uniform to non-uniform, with the width varying along the groove length. This parameter change modifies the stress distribution during creasing, reducing concentrated stress at the paper edge while maintaining effective crease formation in the target region.
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
Prevents paper cutting while maintaining a clear crease formation with uniform stress distribution, reducing manufacturing complexity and costs.
Implementation Method 1
The receiving member is formed to have shearing forces applied to the paper sandwiched between the rotary blade and the groove
Data Source
AI summary
A paper creasing device includes a receiving member including a groove extending in a fixed direction; a rotary blade movable along the groove; and a movement mechanism for moving the rotary blade along the groove at a fixed height in a range between first and second edges of paper in a width direction, the paper being placed on an upper surface of the receiving member. The receiving member is formed to have shearing forces applied to the paper sandwiched between the rotary blade and the groove in an outside range and an inside range in the width direction of the receiving member, the outside range corresponding to at least one of the paper edges located on a side where the rotary blade starts contacting the paper when moving along the groove, and the shearing force in the outside range being smaller than the shearing force in the inside range.