Plastic Cap Fracture Cutting with Axial Re-centering
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Solution Overview
Problem
Existing apparatuses for making fracture cuts between the cup and safety ring in plastic caps face difficulties in repositioning the cup in axial alignment with the mandrel, particularly due to various shapes and dimensions of commercially available caps, making the process complicated and inefficient.
Innovation Solution
The apparatus includes rotary means with a mandrel that rolls the side wall of the cup along a cutting edge, featuring an inlet path to axially offset the cup and recentering means to align it with the rotation axis, driven by a motor via belt drive elements, ensuring effective recentering post-cutting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the cup is axially offset with respect to the mandrel during rolling to enable the blade to make the fracture cut, then the cutting operation can be performed, but the cup becomes misaligned and requires complicated repositioning operations afterward
Solution Approach 1:
The inlet path portion is designed to automatically perform the axial offsetting of the cup with respect to the mandrel before the cutting operation begins. This preliminary positioning action enables the blade to engage the cup side wall at the correct location without requiring complex manual or mechanical repositioning operations after cutting, thus simplifying the overall device while maintaining cutting effectiveness
2Manufacturing precision
If the mandrel is substantially axially offset with respect to the cup to allow the blade to engage the side wall, then the fracture cut can be made, but the cup must be repositioned after cutting which is complicated due to various cap shapes and dimensions
Solution Approach 1:
The inlet path portion is designed with universal characteristics that can accommodate caps of various shapes and dimensions. It performs multiple functions: automatically offsetting the cup axially with respect to the mandrel, positioning the cup side wall against the blade cutting edge, and enabling the fracture cut to be made at the correct location. This multi-functional design eliminates the need for complex repositioning operations for different cap types
3Manufacturing precision
If the cup side wall is pressed by the mandrel against the cutting edge of the blade, then the fracture cut is provided, but the cup becomes misaligned with the mandrel axis after rolling
Solution Approach 1:
The inlet path portion performs preliminary axial offsetting of the cup with respect to the mandrel before the cutting operation. This pre-positioning ensures that when the cup side wall is pressed against the blade cutting edge by the mandrel, the cut is made at the precise location between the cup and safety ring, while the overall alignment is maintained for subsequent operations
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 and versatile repositioning of cups in axial alignment with the mandrel, facilitating the production process across different cap shapes and dimensions, ensuring a simple, safe, and cost-effective operation.
Implementation Method 1
the side wall of the cup is therefore kept pressed by the mandrel against the cutting edge of the blade, thus providing the cut
Data Source
AI summary
An apparatus for making a fracture cut between the cup and the safety ring in plastic caps, which comprises rotary elements provided with at least one mandrel that can be arranged inside the cup and is suitable to produce the rolling, about its own axis of symmetry, of the side wall of the cup along the cutting edge of a blade for making the cut, the blade being associated with an inlet path portion adapted to axially offset the cup with respect to the rotation axis of the mandrel by clamping the side wall against the mandrel; the apparatus also comprises elements for recentering the cup with respect to the rotation axis.