Fan-Wheel Thread Laying Device Stroke Adjustment

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Solution Overview

Problem

Existing impeller thread laying devices struggle to maintain precision in guiding threads during the winding process, especially when the stroke length varies, leading to disturbances in the winding pattern and potential thread breakage.

Innovation Solution

An adjustable impeller thread laying device with a guide device that dynamically adjusts the thread guide contour and impeller axes in proportion to the stroke length, ensuring precise thread guidance at reversal points by using a differential threaded spindle and a control device to synchronize the movement of impellers and the guide contour.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the stroke length of the traversing movement is varied, then the adaptability of the winding machine is improved, but the manufacturing precision of thread guidance at reversal points deteriorates

Engineering Contradiction:

Improveadaptability to different stroke lengthsVSAvoidprecision of thread guidance at reversal points

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The thread guide contour is made dynamically adjustable through the differential threaded spindle mechanism. When stroke length varies, the guide contour position automatically shifts to maintain optimal thread guidance geometry at reversal points, transforming a static precision problem into a dynamically adapted solution

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The invention changes the positional parameter of the thread guide contour relative to the impeller axes based on stroke length requirements. By varying the guide contour position through the differential mechanism, the system maintains precise thread guidance across different operating conditions

Inventive Principle:

Principle #35Parameter changes

2Manufacturing precision

If a fixed thread guide contour is used, then the manufacturing precision is maintained, but the adaptability to variable stroke lengths is reduced

Engineering Contradiction:

Improveprecision of thread guidanceVSAvoidadaptability to variable stroke lengths

Core Design Contradiction:

Manufacturing precisionVSAdaptability or versatility

Solution Approach 1:

The thread guide contour transitions from a fixed element to a dynamically adjustable one. The differential threaded spindle enables the guide contour to shift position in response to stroke length changes, maintaining precision across variable operating conditions

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The adjustable thread guide contour serves multiple functions: it maintains precise thread guidance for standard stroke lengths while also adapting to variable stroke lengths, eliminating the need for separate guide contours for different operating conditions

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Device complexity

If the thread guide contour does not adjust with stroke length, then the device complexity is reduced, but the reliability of the winding process deteriorates due to thread breakage

Engineering Contradiction:

Improvecomplexity of adjustment mechanismVSAvoidreliability of winding process

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The differential threaded spindle acts as an intermediary mechanism that automatically coordinates the position of the thread guide contour with the impeller axes position. This intermediary mechanism ensures proper thread guidance geometry is maintained without requiring complex external control systems

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The system uses its own positional information (impeller axes position and stroke length) to automatically adjust the thread guide contour position through the differential mechanism, eliminating the need for external sensors or control systems

Inventive Principle:

Principle #25Self-service

Data Source

PatentEP3241793B1Traverse device with rotating wings and winding machine with stroke adjusting means and adaptive thread guiding unit

Publication Date: 2018.09.12 SSM SCHIRER SCHWEITER METTLER AG

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AI summary

The invention relates to a fan-wheel thread laying device (12) for winding a thread (14) onto a yarn spool (16) rotating about its longitudinal axis (22), comprising: - two fan wheels (26, 28) which can be driven in opposite directions about their respective axes of rotation (32) in order to move the thread (14) to be wound back and forth relative to the yarn spool (16) by means of an alternating movement in the direction of the longitudinal axis (22) of the yarn spool (16); - a guide device (36) with an arc-shaped thread guide contour (38) along which the thread (14) moved back and forth by the fan wheels (26, 28) is guided during a winding process; and - an adjusting device (42) for adjusting a stroke (H) of the alternating movement of the thread (14).The two axes of rotation (32) of the impellers (26, 28) and the guide device (36) are adjustable in the same direction by means of the adjusting device (42) along an adjusting axis (48), wherein a respective adjustment distance (SF) of the guide device (36) and a corresponding adjustment distance (SD) of the axes of rotation (32) along the adjusting axis (48) are in a fixed proportional ratio m to each other, which is selected such that the thread (14) is guided along the thread guide contour (38) of the guide device (36) during the winding process, regardless of the respective stroke width (H) set, in a direction substantially parallel to the axes of rotation (32) of the impellers (26, 28) or in a direction parallel to the axes of rotation (32) of the impellers (26, 28). The invention further relates to a winding machine (10).