Take-off Cam Part Thread Guidance Mechanism

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Solution Overview

Problem

Existing take-off combs for knitting and warp-knitting machines expose threads and trigger parts to excessive loads, leading to potential damage and wear.

Innovation Solution

A trigger part design featuring a thread-receiving opening with a head that moves relative to a second part, utilizing an inclined surface for thread guidance and closure, ensuring gentle thread handling and protection by preventing excessive stress on the thread and parts.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a slide with a hook or finger-like extension is used to grasp and release the thread, then the thread can be effectively engaged and released, but the thread and trigger parts are exposed to excessive loads and potential damage

Engineering Contradiction:

Improvethread engagement reliabilityVSAvoidexcessive load on thread and trigger parts

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The trigger part is divided into two separate parts: a first part with a thread-receiving opening and a second part with a head that can move relative to the first part. This segmentation allows the head to control the opening without the entire structure being subjected to thread engagement loads, reducing stress on the trigger parts while maintaining reliable thread engagement through the controlled opening mechanism.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The head acts as an intermediary element between the moving mechanism and the thread. By providing an inclined surface that guides the thread into the opening, the head mediates the engagement process, distributing loads more evenly and preventing excessive stress concentration that would occur with direct hook-to-thread contact.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of operation

If the head moves directly into the thread-receiving opening to close it, then thread release is effective, but the thread may be damaged by excessive stress

Engineering Contradiction:

Improvethread release effectivenessVSAvoidthread damage from excessive stress

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The inclined surface on the head performs a preliminary action by guiding the thread into the thread-receiving opening before the head fully moves into position to close the opening. This gradual engagement process prevents sudden stress spikes that would damage the thread, while still achieving effective thread release when the opening is closed.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The inclined surface provides a curved, gradual transition rather than a sharp edge, allowing the thread to be gently guided into the opening. This curved approach distributes the engagement force over a longer distance and time, preventing excessive stress concentration that would occur with direct, sharp-edged contact.

Inventive Principle:

Principle #14Spheroidality (Curvature)

Data Source

PatentEP2072649B1Take-off cam part

Publication Date: 2011.10.19 GROZ BECKERT KG

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AI summary

The pull-off part has a part (12) with a head (34), and another part (11) with a thread retaining opening (26), where the parts are moved relative to each other for closing the thread retaining opening by the head. The parts are longitudinally movable to each other, and the thread retaining section has a section extending in a longitudinal direction (13). The thread retaining opening extends away from the head, and the head has an inclined surface (37) turned towards the thread retaining opening, where the inclined surface is adapted to an inlet section (30) of the thread retaining section.