Rotary Cutting Tool with Disengageable Drive for Cable Segmentation

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Solution Overview

Problem

Existing cutting devices that use rotary cutting tools face difficulties in moving the tool from one cutting position to another without loosening the jaws, due to the presence of the drive member and its size, which limits the ability to make both longitudinal and circular cuts precisely.

Innovation Solution

A cutting apparatus with a rotating circular cutting tool that includes a disengageable drive shaft and tool holder, allowing the cutting tool to move between longitudinal and circular cutting positions without loosening the jaws, using a crank shaft for rotation and axial movement, enabling precise cuts without altering the relative positioning between the jaws and the elongated body.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a rotary cutting tool is used to make both longitudinal and circular cuts, then cutting versatility is improved, but the device complexity increases due to the need to move the tool between positions

Engineering Contradiction:

Improvecutting versatilityVSAvoiddevice complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The cutting tool is made movable relative to the jaw through a disengageable drive shaft mechanism. When the drive shaft is disengaged, the tool can be repositioned between longitudinal and circular cutting positions. When engaged, the tool is locked in position for stable cutting operations. This dynamic configuration allows one tool to perform multiple cutting functions without increasing overall device complexity.

Inventive Principle:

Principle #15Dynamics

2Ease of operation

If the jaws are loosened to move the cutting tool between positions, then tool repositioning is simplified, but the positioning precision of the elongated body deteriorates

Engineering Contradiction:

Improvetool repositioning easeVSAvoidpositioning precision

Core Design Contradiction:

Ease of operationVSManufacturing precision

Solution Approach 1:

The cutting tool and drive shaft are separated from the jaw assembly through a disengageable connection. This allows the tool to be repositioned independently without moving the jaw or altering the grip on the elongated body. The segmentation enables tool flexibility while maintaining jaw stability and positioning precision.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The disengageable drive shaft acts as an intermediary between the jaw and the cutting tool. It allows the tool to be moved to different positions (longitudinal or circular cutting) while the jaw remains firmly gripping the workpiece. The drive shaft mediates the connection, enabling tool repositioning without affecting jaw position or workpiece stability.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Productivity

If the drive shaft is engaged to drive the cutting tool in rotation, then cutting capability is improved, but the ability to reposition the tool deteriorates

Engineering Contradiction:

Improvecutting capabilityVSAvoidtool repositioning ability

Core Design Contradiction:

ProductivityVSAdaptability or versatility

Solution Approach 1:

The drive shaft transitions between two states: engaged and disengaged. When engaged, it transmits rotational motion to drive the cutting tool for high-productivity cutting operations. When disengaged, it allows the tool to be freely repositioned between different cutting configurations. This dynamic switching resolves the contradiction between cutting capability and repositioning flexibility.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The drive shaft is periodically engaged and disengaged during operation. During cutting phases, it is engaged to provide rotational drive power. During repositioning phases, it is disengaged to allow tool movement. This periodic engagement/disengagement pattern enables both high productivity during cutting and adaptability during repositioning.

Inventive Principle:

Principle #19Periodic action

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 precise cutting operations by allowing the cutting tool to be moved between cutting positions without loosening the jaws, increasing the precision and efficiency of both longitudinal and circular cuts.

Implementation Method 1

the cutting tool is driven in rotation by a rotating shaft called shaft drive of the tool, such as a crank shaft

Methodology Applied

Scientific EffectMechanical rotation:

Implementation Method 2

axially movable in a direction parallel to the axis of rotation of said shaft between a disengaged position and an engaged position

Methodology Applied

Scientific EffectAxial displacement:

Implementation Method 3

the cutting edge of the cutting tool extends projecting interior of said housing

Methodology Applied

Scientific EffectMechanical cutting:

Data Source

PatentEP1953884B1Device for cutting an elongated body such as a cable with multiple concentric layers

Publication Date: 2011.07.27 ROUX

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AI summary

The device (1) has a circular rotative cutting tool (7) movably mounted on one of jaws (3, 4). The tool is driven in displacement between a cutting position in which a cutting edge (9) of the tool is extended in withdrawal or outcrop of housing (5), and a cutting position in which the edge is extended in a projection inside the housing. The tool is driven between a circular cutting position in which the edge is orthogonal along a longitudinal axis of an elongated body (2) and a longitudinal cutting position in which the edge is parallel along the axis of the body.