Double Trimming Shears Synchronization Prevents Carriage Tilting

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Solution Overview

Problem

Double trimming shears experience undesirable tilting of the upper-knife carriage due to separate adjustments in the upper and lower areas, leading to inconsistent cutting movements and reduced cutting quality.

Innovation Solution

Connecting the first and second eccentric shafts with a synchronization means, such as a rigid rod, ensures synchronized movement and parallel displacement of the carriage guide, preventing tilting and allowing for optimal adjustment of the knife gap.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the carriage guide is adjusted separately in the upper and lower areas using eccentric shafts, then the knife gap can be adjusted, but the upper-knife carriage experiences undesirable tilting

Engineering Contradiction:

Improveknife gap adjustmentVSAvoidupper-knife carriage tilting

Core Design Contradiction:

Adaptability or versatilityVSStability of the object's composition

Solution Approach 1:

The patent connects the first and second eccentric shafts using a synchronization means (rigid rod), merging their previously independent adjustments into a synchronized system. This ensures that when the knife gap is adjusted, both eccentric shafts move in unison, preventing the upper-knife carriage from tilting while maintaining adjustment capability.

Inventive Principle:

Principle #5Merging (Combining)

2Ease of operation

If a connecting rod is used to couple the eccentric shaft in the lower area, then the carriage guide can be adjusted, but horizontal displacement causes tilting of the upper-knife carriage

Engineering Contradiction:

Improvecarriage guide adjustmentVSAvoidupper-knife carriage tilting

Core Design Contradiction:

Ease of operationVSStability of the object's composition

Solution Approach 1:

The synchronization means acts as an intermediary element between the two eccentric shafts. Instead of directly coupling them with a connecting rod that causes horizontal displacement, the synchronization means mediates their movement, ensuring synchronized vertical adjustment without inducing tilting.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Ease of manufacture

If the eccentric shafts are adjusted independently, then local adjustments can be made, but the cutting movement becomes inconsistent

Engineering Contradiction:

Improvelocal adjustment capabilityVSAvoidcutting movement consistency

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

By connecting the eccentric shafts through synchronization means, the patent merges their independent adjustments into a unified synchronized movement. This ensures consistent cutting motion while preserving the ability to adjust the knife gap, as both shafts move together in response to adjustment inputs.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS9180534B2Double trimming shears

Publication Date: 2015.11.10 SMS GROUP GMBH

AI summary

The invention relates to double trimming shears having a stationary bottom knife and a driven top knife which can be raised and lowered, wherein the top knife is arranged on a top knife carriage (12) guided by means of a carriage guide (10), wherein a first eccentric shaft (14) and a second eccentric shaft (16) on the carriage guide (10) is provided in order to guide the carriage guide (10) if an inclined position of the top knife carriage is to be prevented. This is achieved in that the first eccentric shaft (14) and the second eccentric shaft (16) are interconnected via a synchronization means (18).