Slot Position Offset Detection in Cardboard Box Quality Inspection
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Solution Overview
Problem
Existing methods for checking the quality of foldable boxes with cardboard portions fail to detect 'squaring issues' where the slot extends obliquely or curvedly due to non-square cardboard portions, leading to incorrect quality assessments.
Innovation Solution
A method and machine using two-dimensional image capture and analysis to determine the position of slots on both sides of the product, comparing these positions to detect deviations within a predefined tolerance, allowing for quick and efficient detection of squaring issues without requiring additional hardware.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If stereo imaging with multiple cameras is used to detect squaring issues, then measurement capability is improved, but device complexity and reliability worsen
Solution Approach 1:
The patent extracts only the essential measurement capability from complex stereo imaging systems. Instead of using multiple cameras to capture three-dimensional information, the invention uses a single camera to capture two-dimensional images of the slot at opposite sides of the product, extracting only the positional information needed to detect squaring issues.
Solution Approach 2:
The patent creates a simplified optical copy of the measurement process. By capturing 2D images of the slot positions at both sides and comparing them computationally, the system replicates the measurement function without requiring physical multiple cameras, thus reducing hardware complexity while maintaining detection capability.
2Productivity
If 2D image capture and analysis is used to detect slot position, then detection speed is improved, but measurement precision may worsen
Solution Approach 1:
The patent replaces complex mechanical measurement systems with optical imaging and computational analysis. By using 2D image capture and automated image processing algorithms to analyze slot positions, the system achieves high-speed detection without sacrificing precision, as the computational method can accurately determine positions from pixel data.
Solution Approach 2:
The patent changes the measurement parameters from three-dimensional depth measurement to two-dimensional position comparison. This parameter transformation allows the use of faster 2D imaging technology while maintaining sufficient measurement precision for detecting slot position deviations that indicate squaring issues.
Data Source
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AI summary
The invention relates to a method for checking the quality of a product (1) comprising at least two cardboard portions (2) connected to each other such that a slot (10) extends between the cardboard portions from one side of the product (1) to the opposite side, with the slot (10) being expected to extend perpendicularly with respect to an outer edge of the product (1), comprising the steps of: - capturing a 2D image of the slot (10) at one side of the product (1) and of the slot at the opposite side of the product, - analyzing the images so as to recognize the slot (10), - comparing the positions of the slot of one product at the opposite sides, - making a determination whether or not a difference between the positions is within a predefined range of tolerance. The invention further relates to a machine for checking the quality of a product (1) made from at least two cardboard portions (2) connected to each other such that a slot (10) extends from one side of the product to the opposite side, with the slot being expected to extend perpendicularly with respect to an outer edge of the product, the machine comprising two cameras (304) adapted for capturing a 2D image in a stacking area for stacking the products, an image processing module (306) adapted for recognizing in the captured images the position of the slot on the two sides of the product, and an offset determination module (310) adapted for determining the amount of offset between the position of the slots at the opposite sides of the product.