Desk-Top Cutting Machine Motor Speed Control

Solution Overview

Problem

In desk-top cutting machines, the cutting tool is often driven at maximum speed before manual operation, leading to increased power consumption and noise.

Innovation Solution

A desk-top cutting machine design where the motor is rotated at a slower speed when the cutting part is at the top dead point and increased to maximum speed when the cutting part is at the bottom dead point, using a detection switch to control the rotational speed, and a protective cover to expose the cutting tool for cutting.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the cutting tool is driven at maximum speed before manual operation, then the cutting performance is ensured, but power consumption and noise increase

Engineering Contradiction:

Improvecutting performanceVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The motor rotational speed is dynamically adjusted based on the cutting part position. When the cutting part is at the top dead point, the motor rotates at a first rotational speed slower than maximum speed. When the cutting part reaches the bottom dead point, the motor rotates at maximum speed, ensuring cutting performance only when needed.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The rotational speed parameter of the motor is changed based on the cutting part position. The system switches between a first rotational speed (slower than maximum) at the top dead point and maximum rotational speed at the bottom dead point, optimizing the balance between power consumption and cutting performance.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If the cutting tool is driven at maximum speed before manual operation, then the cutting performance is ensured, but noise generated increases

Engineering Contradiction:

Improvecutting performanceVSAvoidnoise

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The motor rotational speed is dynamically adjusted based on the cutting part position. When the cutting part is at the top dead point, the motor rotates at a first rotational speed slower than maximum speed, reducing noise. When the cutting part reaches the bottom dead point, the motor rotates at maximum speed, ensuring cutting performance only when needed.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The rotational speed parameter of the motor is changed based on the cutting part position. The system switches between a first rotational speed (slower than maximum) at the top dead point and maximum rotational speed at the bottom dead point, optimizing the balance between noise reduction and cutting performance.

Inventive Principle:

Principle #35Parameter changes

3Use of energy by moving object

If the motor rotates at slower speed at top dead point, then power consumption and noise are reduced, but cutting performance may be insufficient

Engineering Contradiction:

Improvepower consumptionVSAvoidcutting performance

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The motor rotational speed is dynamically adjusted based on the cutting part position. When the cutting part is at the top dead point, the motor rotates at a first rotational speed slower than maximum speed, reducing power consumption. When the cutting part reaches the bottom dead point, the motor rotates at maximum speed, ensuring sufficient cutting performance.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The rotational speed parameter of the motor is changed based on the cutting part position. The system switches between a first rotational speed (slower than maximum) at the top dead point and maximum rotational speed at the bottom dead point, optimizing the balance between power consumption and cutting performance.

Inventive Principle:

Principle #35Parameter 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 design reduces noise and power consumption while maintaining sufficient cutting performance by controlling the motor speed based on the cutting part's position.

Implementation Method 1

the motor is configured to be rotated at a first rotational speed slower than a maximum rotational speed thereof when the cutting part is positioned at the top dead point

Methodology Applied

Scientific EffectMotor rotation speed control:

Data Source

PatentEP2872277B1Desk-top cutting machine

Publication Date: 2018.05.16 KOKI HLDG CO LTD

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AI summary

A desk-top cutting machine including: a base configured to support a workpiece; a cutting part including, a motor configured to rotary drive a cutting tool, a main cover covering an upper portion of the cutting tool, and a protective cover covering a portion of the cutting tool that is not covered by the main cover, the protective cover configured to move in a direction of exposing the cutting tool when the cutting part swings toward a bottom dead point from a top dead point; and a cutting part support mechanism configured to swingably support the cutting part, characterized in that: the motor is configured to be rotated at a first rotational speed slower than a maximum rotational speed thereof when the cutting part is positioned at the top dead point.