Axially Adjustable Cutter Shaft Carrier for Web Slitting
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Solution Overview
Problem
Existing devices for slitting material webs between cutter shafts face challenges in compensating for axial offsets due to production reasons and thermal expansions, requiring costly compensating rings that need to be exchanged, which is inefficient and expensive.
Innovation Solution
The device features an axially adjustable knife shaft carrier relative to a cutting frame with an adjusting device that allows for compensating the axial offset without using compensating rings, enabling in-situ adjustment of the cutter shafts to maintain consistent gap widths during operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If compensating rings are used to compensate for axial offset between cutter shafts, then the gap width consistency is improved, but the device complexity and operational cost increase due to ring exchange requirements
Solution Approach 1:
The patent applies the dynamics principle by making the knife shaft carrier axially adjustable relative to the cutting frame through an adjusting device. This allows the system to dynamically adapt to axial offsets between cutter shafts by moving the knife shaft carrier to the appropriate position, eliminating the need for static compensating rings that require exchange. The adjusting device includes adjusting stops and an adjusting element that enables continuous axial position adjustment.
Solution Approach 2:
The patent extracts the compensating function from the compensating rings and integrates it directly into the knife shaft carrier through the adjusting device. By removing the separate compensating ring component and its exchange mechanism, the patent simplifies the overall device structure while maintaining the gap width consistency through direct axial adjustment of the knife shaft carrier position.
2Manufacturing precision
If compensating rings are exchanged to compensate for axial offset, then the cutting precision is improved, but the productivity decreases due to downtime for ring exchange
Solution Approach 1:
The adjusting device enables continuous adjustment of the knife shaft carrier's axial position during operation or setup, allowing the system to adapt to thermal expansions and production variations without stopping to exchange components. This dynamic adjustment capability maintains cutting precision while ensuring operational continuity.
Solution Approach 2:
The system performs self-adjustment through the adjusting device, which can compensate for axial offsets without requiring external intervention to exchange compensating rings. The adjusting element between the adjusting stops enables the operator to directly adjust the knife shaft carrier position, eliminating the need for complex ring exchange procedures and maintaining productivity.
3Stability of the object's composition
If compensating rings are used to compensate for thermal axial expansion, then the gap width stability is improved, but the ease of operation deteriorates due to the need for ring exchange
Solution Approach 1:
The adjusting device provides a simple and direct method for adjusting the knife shaft carrier's axial position to compensate for thermal expansions. Instead of exchanging compensating rings, the operator can use the adjusting element between the adjusting stops to move the knife shaft carrier to the correct position, maintaining gap width stability while significantly improving ease of operation.
Solution Approach 2:
By removing the compensating ring exchange mechanism and replacing it with a direct adjustment system, the patent simplifies the operational process. The adjusting device with its stops and adjusting element provides an intuitive and simple adjustment procedure that maintains gap width stability without the complexity of ring selection and exchange.
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 solution allows for efficient compensation of axial offsets without re-equipping the cutter shafts, enabling precise adjustment of gap widths during operation, reducing waste and operational costs by eliminating the need for compensating rings.
Implementation Method 1
an axial offset occurs between the cutter shafts due to temperature influences and the resulting different thermal axial expansions
Data Source
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AI summary
The invention relates to a method and a device for longitudinally slitting a web of material passing between a first and a second cutter shaft (12, 13), wherein the first cutter shaft is arranged on a cutting frame (34) and the second cutter shaft is arranged on a cutter shaft carrier (35) which is axially adjustable relative to the cutting frame, wherein an adjusting device (36) is arranged between the cutting frame and the cutter shaft carrier, comprising a first adjusting stop attached to the cutting frame, a second adjusting stop attached to the cutter shaft carrier and an adjusting element acting between the adjusting stops, with which the distance between the adjusting stops can be changed in such a way that the reference edges of the stop flanges of the cutter shafts are axially adjustable relative to each other.