Cutting Machine Tool Preloading Unit Play Compensation

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Solution Overview

Problem

Existing machine tool parting devices lack effective automatic compensation for play and tolerance in cutting strands, leading to potential damage and inefficiencies during repeated assembly and machining processes.

Innovation Solution

A machine tool parting device with a pretensioning unit, featuring a spring-elastic pretensioning element and mirror-symmetrically arranged cutting strand holding elements, automatically compensates for elongation and play/tolerance by applying force to the cutting strand, ensuring it remains under tension and securely attached to the guide unit.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a cutting strand is used without a preloading unit, then the device structure remains simple, but play and tolerance of the cutting strand cannot be automatically compensated, leading to potential damage and inefficiencies

Engineering Contradiction:

Improveautomatic compensation of play and toleranceVSAvoidstructure of guide unit

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The preloading unit is designed to automatically compensate for play and tolerance of the cutting strand without requiring external intervention or complex control systems. The spring element self-adjusts to maintain proper tension, making the system self-regulating and improving reliability while keeping the overall structure relatively simple.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The preloading unit applies preliminary force to the cutting strand to pre-compensate for expected play and tolerance before machining operations begin. This preliminary action ensures the cutting strand is properly tensioned and positioned, preventing damage and inefficiencies during operation.

Inventive Principle:

Principle #10Preliminary action

2Adaptability or versatility

If the guide unit is disconnected from the coupling device, then the machine tool can be transported or repositioned, but the cutting strand may hang up or become damaged without tension maintenance

Engineering Contradiction:

Improverepeated assembly and disassemblyVSAvoidcutting strand damage

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The spring element in the preloading unit acts as a cushioning mechanism that maintains tension on the cutting strand even when the guide unit is disconnected from the coupling device. This beforehand cushioning prevents the cutting strand from hanging up or becoming damaged during transport and repositioning operations.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

Solution Approach 2:

The preloading unit with spring element provides a simple, cost-effective solution to protect the more expensive cutting strand. Rather than risking damage to the cutting strand during disassembly and assembly operations, the preloading unit absorbs the stress and prevents harm.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Reliability

If multiple cutting strand holding elements are used, then the cutting strand is more securely retained, but the device complexity increases

Engineering Contradiction:

Improvecutting strand retentionVSAvoidpreloading unit structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The cutting strand holding elements are arranged in a specific configuration where at least one holding element is positioned differently from others, creating an asymmetric arrangement that effectively secures the cutting strand. This asymmetric design provides reliable retention while avoiding the need for multiple identical components in a complex symmetric arrangement.

Inventive Principle:

Principle #4Asymmetry

Solution Approach 2:

Multiple cutting strand holding elements are combined into a single integrated preloading unit structure. Rather than being separate devices, the holding elements work together as part of one unified mechanism, providing secure retention while maintaining relatively simple overall device complexity.

Inventive Principle:

Principle #5Merging (Combining)

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 prevents cutting strand hang-ups, reduces damage, and facilitates repeated assembly, maintaining cutting strand tension and stability during machining, thereby enhancing operational efficiency and tool longevity.

Implementation Method 1

at least one spring-elastic pretensioning element (22), which is arranged on at least one of the movably mounted cutting strand holding elements (24, 26) of the preloading unit (16)

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentEP3297799B1Tool of cutting machine

Publication Date: 2020.05.20 ROBERT BOSCH GMBH

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AI summary

The invention relates to a power-tool cutting device (10), which is free of a torque-transmitting element (56), comprising at least one cutting strand (12) and at least one guiding unit (14) for guiding the cutting strand (12), which guiding unit, in particular together with the cutting strand (12), forms a closed system. According to the invention, the power-tool cutting device (10) has at least one preloading unit (16), which is arranged on the guiding unit (14) and is provided for automatic play compensation and/or tolerance compensation of the cutting strand (12) at least during a state of the guiding unit (14) in which the guiding unit is removed from a coupling device (18) of a portable power tool (20).