Elastomeric Sheet Cutting with Lateral Edge Sensor
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Solution Overview
Problem
Existing apparatuses for converting sheets into continuous strips face challenges due to irregularities in shape, size, and thickness of elastomeric materials, particularly with varying lateral positions of longitudinal edges, leading to issues like blockage and clogging.
Innovation Solution
The apparatus includes a cutting section with a lateral edge sensor to detect edge positions upstream of the cutting line, allowing precise cutting and a stretching mode with differing infeed rates to smooth out irregularities, along with calendering rolls and guide bodies to maintain sheet alignment and prevent pulling, and a control unit to adjust cutting parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the sheet is cut using a fixed cutting line, then the cutting process is simple and fast, but the varying lateral positions of longitudinal edges cause irregularities and blockages
Solution Approach 1:
The lateral edge sensor detects the lateral positions of longitudinal edges upstream of the cutting line before the cutting operation occurs. This preliminary detection allows the system to determine where to start or end cuts in advance, enabling the cutting mechanism to adjust its parameters before actually cutting, thus maintaining both high speed and consistency
Solution Approach 2:
The cutting system transitions from a fixed cutting line to a dynamic cutting pattern where the start and end positions of cuts are adjusted based on real-time edge detection. The cutting mechanism can dynamically modify cutting parameters (start position, end position, termination distance) according to the detected lateral positions of sheet edges, resolving the contradiction between fixed-speed cutting and variable-edge positioning
2Loss of time
If the detection position is far upstream from the cutting line, then there is sufficient time to adjust cutting parameters, but the apparatus complexity increases
Solution Approach 1:
A single lateral edge sensor is used to detect both longitudinal edges of the sheet by moving with the cutting member. This multi-functional approach allows one sensor to perform the work of potentially two sensors, reducing system complexity while still providing sufficient detection time for parameter adjustments
Data Source
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AI summary
The invention relates to an apparatus and a method for converting a sheet of elastomeric material into a continuous strip, wherein the apparatus comprises a cutting section for providing a sequence of cuts in the sheet along which the sheet is separable into interconnected zig-zag sections to form the continuous strip, wherein the sheet has two longitudinal edges, wherein the cuts in the sequence alternately extend from one of the longitudinal edges towards and terminate at a termination distance short of the other of the longitudinal edges to form the plurality of interconnected zig-zag sections, wherein the cutting section comprises a cutting member for cutting the sheet along a cutting line intersecting with the feeding path and an lateral edge sensor for detecting lateral positions of the longitudinal edges at a detection position upstream of the cutting line with respect to the feeding direction.