Conveyance Component Misalignment Sensing with Camera Photogrammetry

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Solution Overview

Problem

Precise positioning of components within conveyance systems, such as elevator systems, is difficult and costly to determine, affecting optimal operation.

Innovation Solution

A method and apparatus using a camera system for photogrammetric measurements to capture and compare baseline and follow-on images of components, determining misalignment, and triggering alerts or maintenance events when deviations exceed acceptable ranges.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If traditional precise positioning methods are used to determine component alignment, then measurement precision is improved, but device complexity and cost increase

Engineering Contradiction:
Improvecomponent alignment measurement precisionVSAvoidpositioning system complexity
Core Design Contradiction:
Measurement precisionVSDevice complexity

Solution Approach 1:

The patent replaces complex mechanical positioning systems with a camera-based optical system. Instead of using precision mechanical gauges or laser measurement devices, the invention uses standard cameras to capture images of components, then uses image processing and photogrammetric techniques to determine alignment. This substitution dramatically reduces device complexity and cost while maintaining measurement precision.

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

Solution Approach 2:

The patent creates visual copies (images) of the physical components using a camera system. By capturing images of door locks, door assemblies, and other components, the system creates digital representations that can be analyzed for alignment without physically measuring the components. This copying approach simplifies the measurement process and reduces the need for complex physical measurement devices.

Inventive Principle:
Principle #26Copying

2Reliability

If frequent manual inspections are performed to detect misalignment, then reliability is improved, but loss of time and productivity decrease

Engineering Contradiction:
Improvesystem operation reliabilityVSAvoidmaintenance productivity
Core Design Contradiction:
ReliabilityVSProductivity

Solution Approach 1:

The patent implements continuous automated monitoring of component alignment through camera systems that continuously or periodically capture images of components. This continuous monitoring ensures reliable detection of misalignment issues without requiring periodic manual inspections, thereby maintaining system reliability while eliminating the time loss associated with scheduled manual checks and improving overall maintenance productivity.

Inventive Principle:
Principle #20Continuity of useful action

Solution Approach 2:

The system enables self-monitoring and self-diagnosis of component alignment. The camera system automatically detects misalignment conditions and can trigger alerts or maintenance workflows without human intervention. This self-service capability ensures continuous reliability monitoring while freeing up maintenance personnel from routine inspection tasks, thereby improving productivity.

Inventive Principle:
Principle #25Self-service

3Ease of operation

If manual alignment checking is used, then ease of operation is improved, but measurement precision deteriorates

Engineering Contradiction:
Improvealignment checking easeVSAvoidalignment measurement precision
Core Design Contradiction:
Ease of operationVSMeasurement precision

Solution Approach 1:

The patent replaces manual visual inspection and physical measurement with automated image-based measurement systems. The camera system automatically captures images and processes them to determine precise alignment, eliminating the need for manual measurement tools and techniques. This substitution maintains ease of operation (the system is easy to operate) while dramatically improving measurement precision through automated image analysis and photogrammetric calculations.

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

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

Enables accurate monitoring of component alignment, reducing maintenance costs and ensuring optimal system performance by detecting and addressing misalignments proactively.

Implementation Method 1

determining a follow-on location of the component using photogrammetric measurements of a follow-on image captured by the camera system

Methodology Applied
Scientific EffectPhotogrammetry: Photogrammetry

Data Source

PatentEP4206107B1Component misalignment sensing
Publication Date: 2025.08.13 OTIS ELEVATOR CO
  • EP4206107B1 patent drawingFigure 1
  • EP4206107B1 patent drawingFigure 2
  • EP4206107B1 patent drawingFigure 3A~3B

AI summary

A method of monitoring an alignment of a component (300) of a conveyance system including: capturing, using a camera system (208), a follow-on image of the component (300) of the conveyance system; determining a follow-on location of the component (300) using photogrammetric measurements of the follow-on image; comparing the follow-on location to a baseline location of the component; and determining whether the component (300) has shifted away from the baseline location based on the follow-on location and the baseline location.