Rotary Cutting Knife Arrangement With Dynamic Stripper

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing cutting knife arrangements for packaging material pose a risk of injury to operators during maintenance and struggle with reliable removal of material strips, as the cutting knives are exposed and require manual handling.

Innovation Solution

A cutting knife arrangement with a flexible stripper that moves between an offset and safety position, allowing for reliable removal of packaging material strips while minimizing operator risk, featuring a wiper that extends radially from the cutting knife in the safety position to prevent direct contact and injury.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If the cutting blade is exposed to cut packaging material from above, then the cutting function is achieved, but the risk of injury to the operator increases

Engineering Contradiction:

Improvecutting functionVSAvoidrisk of injury to operator

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

The stripper is introduced as an intermediary component between the operator and the cutting blade. During maintenance, the stripper can be positioned to extend beyond the cutting blade radially, physically blocking direct access to the blade while still allowing the blade to perform its cutting function during operation.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The stripper is designed to be movable between different positions - during operation it retracts to allow cutting, and during maintenance it extends to provide safety protection. This dynamic positioning resolves the contradiction by adapting the safety feature to the operational state.

Inventive Principle:

Principle #15Dynamics

2Productivity

If the stripper is positioned close to the cutting blade for effective stripping, then the stripping function is improved, but the safety protection for the operator is reduced

Engineering Contradiction:

Improvestripping functionVSAvoidexposure to cutting blade

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The stripper's position is made dynamic rather than fixed. During cutting operation, the stripper is positioned close to the blade (within 1-5mm) for effective stripping. During maintenance, the stripper can be moved to extend beyond the blade radially, providing safety protection while maintaining the ability to perform stripping function when needed.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentEP4501562A1Cutting blade assembly and packaging material cutting device

Publication Date: 2025.02.05 MULTIVAC SEPP HAGGENMULLER GMBH & CO KG

Figure 1
Figure 2~3
Figure 4~6

AI summary

Cutting knife arrangement for a device for cutting packaging material, the cutting knife arrangement comprising at least one cutting knife unit with a cutting knife rotatably mounted about an axis of rotation and a movably arranged stripper associated with the cutting knife for stripping packaging material from the cutting knife, wherein the stripper can be moved between a stripping position and a locking position, wherein the stripper can strip packaging material from the cutting knife in the stripping position and the stripper extends radially from the axis of rotation beyond the cutting knife in the locking position.