Interfolding Cutting Roller With Isostatic Blade Clamping
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Solution Overview
Problem
The existing cutting rollers for interfolding machines suffer from non-uniform pressing force distribution between the blade block insert and the blades, leading to blade flexion during rotation, resulting in imprecise and dirty cuts, and potential machine halts due to paper adhesion.
Innovation Solution
The cutting roller design incorporates a first and second abutment area between the main body and the insert, ensuring an isostatic system that maintains blade position, with uniform pressing force distribution through distinct fixing and support means, enhancing precision and reducing paper adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the blade block insert contacts the blade with a single abutment area, then the structure is simpler, but the pressing force is non-uniform causing blade flexion and cutting imprecision
Solution Approach 1:
The contact interface between the blade block insert and the main body is segmented into multiple abutment areas (first abutment area and second abutment area) instead of a single contact point. This segmentation allows the pressing force to be distributed uniformly across the blade, preventing flexion while maintaining structural feasibility.
Solution Approach 2:
Different regions of the blade block insert are designed with specific local properties: the first abutment area contacts the blade to provide pressing force, while the second abutment area contacts the main body to provide rotational freedom. This local differentiation ensures uniform force distribution without over-constraining the system.
2Stability of the object's composition
If the blade block insert is over-constrained with multiple contact points, then the blade position is more stable, but the system becomes hyperstatic causing blade flexion during rotation
Solution Approach 1:
The blade block insert is designed to rotate freely with respect to the main body around the screw axis, introducing dynamic capability to an otherwise static system. This rotation freedom transforms the hyperstatic system into an isostatic one, allowing the blade to maintain stable positioning during rotation without inducing flexion forces.
Solution Approach 2:
The fixing means combines two functions into a single screw element: it provides the pressing force through the blade block insert while simultaneously allowing rotational movement. This merging of functions achieves both blade stability and rotational freedom without requiring separate constraint mechanisms.
3Manufacturing precision
If the blade block insert rotates to contact the blade, then the blade is maintained in position, but the non-parallel abutment areas create hyperstatic conditions
Solution Approach 1:
The blade block insert is designed to rotate slightly beyond what would be minimally required for blade contact, ensuring that the first and second abutment areas both engage properly. This partial over-rotation guarantees reliable blade positioning while maintaining the isostatic balance of the system.
Data Source
AI summary
A cutting roller includes a main body activatable in rotation and including a first seat; an insert arranged to insert in the first seat, borne by the main body and including a first through-hole; a blade arranged between the main body and the insert; the main body includes a second seat; a pressing element borne by the insert and interposed between the insert and the main body; support means connected to the insert and arranged to support the pressing element; fixing means positioned to cross the first through-hole and received in the second seat to fix the main body and the insert. Once the fixing means are positioned and the main body and the insert are fixed, the pressing element exerts a pressing force on the blade so that the main body and the insert maintain the blade in position defining a first abutment area and a second abutment area.