Oscillating Pneumatic Blade for Consistent Leather Cutting Stroke

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Solution Overview

Problem

Existing pneumatic cutting devices for leather sheet cutting machines suffer from inconsistent oscillation stroke lengths due to delays in piston switching, affecting cutting efficiency and productivity, and require external switching members for oscillation control.

Innovation Solution

A pneumatic cutting device with an oscillating blade that eliminates the need for external switching members by using a specialized pneumatic activating system with discharge conduits of larger transverse section than the main conduit, allowing for faster air flow and greater effective pressure on the oscillating piston, resulting in higher oscillation velocities.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If external switching members or shutters are used to control piston oscillation, then the oscillation can be switched, but the switching takes delay time causing inconsistent oscillation stroke lengths

Engineering Contradiction:

Improveconsistency of oscillation stroke lengthVSAvoidswitching delay time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The invention removes external switching members and shutters from the system, extracting the source of switching delay. The piston oscillation is now controlled solely by the pneumatic activating system's alternating communication with the two openings of the oscillating chamber, eliminating mechanical switching components that cause time delays and stroke inconsistency.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The invention replaces the mechanical switching system (shutters, valve members, external switching members) with a pneumatic control system. The pneumatic activating system uses alternating pneumatic pressure communication with the two openings to control piston oscillation, substituting mechanical switching with pneumatic actuation that has no moving switching parts and thus no switching delay.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Productivity

If conventional pneumatic activating system with equal conduit sections is used, then the system is simple, but the oscillation velocity is limited and cutting efficiency is reduced

Engineering Contradiction:

Improvecutting efficiencyVSAvoidoscillation velocity

Core Design Contradiction:

ProductivityVSSpeed

Solution Approach 1:

The invention introduces asymmetry in the pneumatic conduit system by making the discharge conduits have a larger transversal section than the main pneumatic conduit. This asymmetric configuration allows faster air flow during discharge phases, enabling higher oscillation velocities of the piston and cutting blade, thereby improving cutting efficiency without requiring symmetric conduit design.

Inventive Principle:

Principle #4Asymmetry

3Ease of operation

If external switching members are used for oscillation control, then switching can be achieved, but the device complexity increases

Engineering Contradiction:

Improveoscillation controlVSAvoidnumber of switching components

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The invention extracts and removes all external switching members, shutters, and valve members from the system. The oscillation control is achieved purely through the pneumatic activating system's alternating communication with the two openings of the oscillating chamber, eliminating the need for separate switching components and reducing device complexity while maintaining ease of operation.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The pneumatic activating system performs multiple functions: it provides pneumatic pressure to the oscillating chamber, controls the oscillation timing through alternating communication with the two openings, and eliminates the need for separate switching members. This multi-functionality reduces the overall number of components while maintaining effective oscillation control.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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

The solution achieves consistent and higher oscillation velocities of the cutting blade, enhancing cutting efficiency and productivity without the need for external switching members, ensuring continuous contact with the leather sheet during cutting.

Implementation Method 1

a pneumatic activating system (P) communicating with the oscillating chamber (1)... source of pneumatic power supply (P1)... placed in communication alternatively with the source of pneumatic power supply (P1) and with the at least a discharge (S1, S2)

Methodology Applied

Scientific EffectPneumatic pressure: Pressure Increase

Data Source

PatentEP3619329B1A pneumatic cutting device having an oscillating blade for leather sheet cutting machines

Publication Date: 2021.03.31 TESEO SPA

Figure 1A~1B
Figure 2A
Figure 2B

AI summary

The cutting device (100) comprises an oscillating chamber (1); an oscillating piston (10) predisposed with the head (13) thereof in the oscillating chamber (1) and with the rod (14) connected to a cutting blade (L); a pneumatic activating system (P) communicating with the oscillating chamber (1) so as to pneumatically activate the oscillating piston (10) to oscillate in the oscillating chamber (1) and thus cause the cutting blade (L) to oscillate vertically to cut a leather sheet (V).