Ceiling-Mounted SCARA Robot Vibration Detection Accuracy

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Solution Overview

Problem

Ceiling-mounted SCARA robots face inadequate vibration detection accuracy due to insufficient consideration of the installation position of vibration detection devices, leading to inefficient vibration control and reduced work precision.

Innovation Solution

A robot system with a vibration detection section installed on the base section, allowing for direct detection of vibrations and improved accuracy, where the length of the actuation shaft from the second arm to its end section is shorter than the distance between the second and first arms, enabling effective vibration control and enhanced work precision.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If the vibration detection device is installed at the tip end section of the robot arm, then the device can detect vibrations, but the detection accuracy is insufficient due to inadequate consideration of installation position

Engineering Contradiction:

Improvevibration detection accuracyVSAvoidinstallation position selection

Core Design Contradiction:

Measurement precisionVSEase of operation

Solution Approach 1:

The patent introduces a base section as an intermediary structure between the installation surface and the robot arm. The vibration detection device is installed on this base section rather than directly on the robot arm, allowing for optimized vibration detection while isolating the detection system from the dynamic movements of the arm.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent changes the installation dimension from the robot arm (moving component) to the base section (stationary component). This dimensional shift in installation location enables more accurate vibration detection by positioning the sensor in a more stable reference frame.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Length of moving object

If the shaft length is made longer, then the reach and working space are improved, but the vibration and positional accuracy deteriorate

Engineering Contradiction:

Improveshaft lengthVSAvoidpositional accuracy

Core Design Contradiction:

Length of moving objectVSManufacturing precision

Solution Approach 1:

The patent optimizes the shaft length parameter by setting it to be shorter than the distance between the first and second arms. This parameter change balances the competing requirements of reach and positional accuracy, preventing excessive vibration while maintaining adequate working space.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

Instead of making the shaft as long as possible to maximize reach, the patent inverts the approach by deliberately limiting the shaft length to be shorter than the arm distance. This inverted design choice prioritizes vibration control and positional accuracy over maximum reach.

Inventive Principle:

Principle #13The other way round (Inversion)

3Manufacturing precision

If vibration control is not adequately implemented, then the system complexity is reduced, but the work precision and productivity deteriorate

Engineering Contradiction:

Improvework precisionVSAvoidvibration control system complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent implements preliminary vibration detection by placing the detection device on the base section before the robot arm operates. This allows vibration characteristics to be detected and controlled in advance, preventing precision degradation before it occurs.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent establishes a feedback loop where the vibration detection device continuously monitors vibrations and provides information for control. This feedback mechanism enables dynamic adjustment to maintain work precision without requiring overly complex predictive control systems.

Inventive Principle:

Principle #23Feedback

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 configuration enhances vibration detection accuracy and control, leading to improved positional accuracy and higher precision in work operations, such as gripping and processing of precision devices.

Implementation Method 1

a vibration detection section that is provided on the base section

Methodology Applied

Scientific EffectVibration detection: Vibration

Data Source

PatentUS20250091197A1Robot, Ceiling Mounted Type Robot And Robot System

Publication Date: 2025.03.20 SEIKO EPSON CORP

AI summary

A robot includes a base section that is installed on an installation surface; a first arm that is connected to the base section so as to be pivotable about a first pivot axis with respect to the base section; a second arm that is connected to the first arm so as to be pivotable about a second pivot axis parallel to the first pivot axis with respect to the first arm; a shaft that is connected to the second arm so as to be pivotable about a third pivot axis parallel to the first pivot axis with respect to the second arm and so as to be movable along an axial direction of the third pivot axis, and that includes an end section on a first arm side; and a vibration detection section that is provided on the base section, wherein a length of the shaft from the second arm to the end section of the shaft is shorter than a distance along the axial direction of the third pivot axis between the second arm and the first arm.