Bag Destacking via Mark Detection Sensors

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Solution Overview

Problem

The existing methods for unstacking bags from a pallet, particularly in bagging lines, face challenges due to irregular orientations, variations in lighting conditions, and the complexity and cost of image recognition software, leading to inefficiencies and potential errors in bag orientation and counting.

Innovation Solution

A method utilizing a gripper controlled by a control system with mark detection means, including a sensor configured to detect physical quantity variations along a secant trajectory, to determine the end of a stack and ensure correct orientation and counting of bags, eliminating the need for extensive image analysis and reducing reliance on expensive image recognition software.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If image recognition software is used to detect bag position and orientation, then measurement precision is improved, but device complexity and cost increase

Engineering Contradiction:
Improvebag position and orientation detection accuracyVSAvoidsoftware complexity
Core Design Contradiction:
Measurement precisionVSDevice complexity

Solution Approach 1:

The patent replaces expensive, complex image recognition software with simple, inexpensive optical sensors (such as laser sensors or cameras) that detect marked positions on bags. These sensors provide sufficient measurement precision for bag location and orientation without requiring complex image processing algorithms, thereby reducing device complexity and cost while maintaining adequate detection accuracy.

Inventive Principle:
Principle #27Cheap short-living objects (Disposable)

Solution Approach 2:

The patent substitutes the mechanical/optical sensor system with marked physical references against simple detection sensors, replacing the need for complex computational image recognition. The marked positions on bags serve as physical reference points that can be detected by straightforward optical measurement, eliminating the need for sophisticated software-based image analysis.

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

2Measurement precision

If image recognition software is used to analyze bag images, then measurement precision is improved, but productivity decreases due to processing time

Engineering Contradiction:
Improvebag position and orientation detection accuracyVSAvoidbag unstacking rate
Core Design Contradiction:
Measurement precisionVSProductivity

Solution Approach 1:

The patent applies marks to bag positions and orientations in advance during the stacking process. These pre-applied marks serve as ready-made reference points that can be quickly detected by optical sensors, eliminating the need for time-consuming real-time image analysis. The preliminary placement of visual references enables fast, straightforward detection that maintains precision without sacrificing productivity.

Inventive Principle:
Principle #10Preliminary action

Solution Approach 2:

The patent uses simple, inexpensive optical sensors instead of complex image recognition software, enabling rapid detection of bag positions and orientations. The detection process becomes a simple matter of reading marked positions rather than performing complex image analysis, significantly reducing processing time and increasing bag unstacking rate while maintaining adequate measurement precision.

Inventive Principle:
Principle #27Cheap short-living objects (Disposable)

3Adaptability or versatility

If image recognition software is used for mark detection, then adaptability to varying lighting conditions is improved, but device complexity increases

Engineering Contradiction:
Improvelighting condition variability toleranceVSAvoiddetection system complexity
Core Design Contradiction:
Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent employs marks with distinct visual characteristics (such as high-contrast colors or reflective properties) that can be reliably detected by optical sensors regardless of ambient lighting conditions. These specially designed marks create strong, consistent optical signals that simple sensors can detect without requiring complex image processing to compensate for lighting variations, thus achieving adaptability with minimal device complexity.

Inventive Principle:
Principle #32Color changes

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 approach ensures reliable and efficient unstacking of bags by using simple, cost-effective mark detection, maintaining high accuracy and speed, even under varying lighting conditions, and adapting to potential discrepancies in stack configurations.

Implementation Method 1

a first sensor configured to detect a variation of a physical quantity when a mark passes through its measurement field

Methodology Applied
Scientific EffectLight detection: Photoelectric Effect

Data Source

PatentEP2918525B1Method for destacking objects stored on a mounting and associated device
Publication Date: 2016.10.05 CETEC IND CONDITIONNEMENT
  • EP2918525B1 patent drawingFigure 1A~2C
  • EP2918525B1 patent drawingFigure 3A~6B
  • EP2918525B1 patent drawingFigure 5

AI summary

The object of the invention is a method for destacking objects stored in several stacks, each stack comprising several objects, said objects being oriented in the same way in each stack. The destacking method consists of grasping, by means of at least one gripper (38) controlled by a control system, the objects one by one in order to deposit them in a given orientation at an output (38). Each object comprises at least one mark (44) positioned identically for all objects. The method is characterized in that it consists of using mark detection means (44) comprising at least a first sensor (46) configured to detect a change in a physical quantity when a mark (44) passes through its measurement field, and moving said first sensor (46) along a trajectory intersecting the theoretical position of the mark on the object in the stack being destaked in order to determine whether the stack being destaked is complete.