Coaxial Motor Operating Head for Precision Tool Orientation

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Solution Overview

Problem

Existing operating heads for machining wood components have large dimensions and incorrect tool positioning due to the side placement of the second electric motor and gear clearances, compromising the precision of the tool assembly around the electrospindle's longitudinal axis.

Innovation Solution

An operating head design featuring an orienting device with a coaxially mounted electric motor and a cup-shaped rotor, coupled to the tool assembly via a fastening pin and a pneumatic actuating cylinder, ensuring correct positioning and compact dimensions by directly connecting the rotor to the tool assembly casing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If the second electric motor is positioned laterally to the electrospindle and coupled through gears, then the tool assembly can be oriented about the longitudinal axis, but the operating head dimensions become large and positioning precision deteriorates due to gear clearances

Engineering Contradiction:

Improvetool assembly orientationVSAvoidoperating head dimensions

Core Design Contradiction:

Ease of operationVSVolume of moving object

Solution Approach 1:

The invention extracts the second electric motor from its conventional lateral position and relocates it coaxially within the electrospindle structure. This extraction from the traditional configuration allows the motor to be integrated into the central axis, eliminating the need for lateral gear mechanisms and thereby reducing the overall operating head dimensions while maintaining the tool assembly orientation capability

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The invention introduces a direct coupling mechanism as an intermediary between the coaxially positioned second electric motor and the tool assembly. This intermediary connection eliminates the gear train and its associated clearances, providing precise positioning while maintaining the ability to orient the tool assembly about the longitudinal axis

Inventive Principle:

Principle #24Intermediary (Mediator)

2Power

If gears are used to couple the second electric motor to the tool assembly, then rotational motion can be transmitted, but positioning precision deteriorates due to inevitable gear clearances

Engineering Contradiction:

Improverotational motion transmissionVSAvoidtool assembly positioning

Core Design Contradiction:

PowerVSManufacturing precision

Solution Approach 1:

The invention replaces the mechanical gear transmission system with a direct coupling mechanism. This substitution eliminates the intermediate gear elements and their inherent clearances, thereby achieving both effective rotational motion transmission and precise positioning of the tool assembly about the longitudinal axis without the compromising effects of gear backlash

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Ease of operation

If a lateral motor configuration with gears is used, then the tool assembly can be oriented, but the device complexity increases

Engineering Contradiction:

Improvetool assembly orientationVSAvoidmotor coupling mechanism

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The invention merges the second electric motor coaxially with the electrospindle structure, combining what were previously separate lateral components into a unified central arrangement. This merging eliminates the need for complex lateral gear coupling mechanisms, reducing device complexity while preserving the tool assembly orientation capability through a simpler direct coupling system

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS8414232B2Operating head

Publication Date: 2013.04.09 HSD S P A

AI summary

In an operating head, a tool assembly is provided with an inlet shaft engaged on an electrospindle and pivotally engaged through a corresponding containing casing, which is oriented about a longitudinal axis of the electrospindle by means of an electric motor coaxially mounted to the axis and provided with a rotor coupled in an angularly fixed manner to the casing itself.