Cross Lapper Cover Belt Synchronization Mechanism
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Solution Overview
Problem
Existing cross lapper designs for forming nonwovens face challenges in securely guiding fiber webs and reducing stress on cover belts, leading to increased wear and complexity due to high relative speeds between stationary cover belts and moving carriages.
Innovation Solution
A cross lapper design featuring a transversely movable upper carriage with a rough web conveyor belt and a smooth cover section or array of linear elements, accompanied by a compensating mechanism to manage length changes, ensuring secure fiber web guidance and reduced wear on the cover belt.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a stationary cover belt is used to cover the fiber web, then the fiber web is protected from being blown about, but high relative speeds between the cover belt and upper carriage cause severe stress and increased wear
Solution Approach 1:
The cover belt is transformed from a stationary structure to a dynamic component that moves synchronously with the upper carriage. The drive mechanism couples the cover belt's motion to the upper carriage position, ensuring the cover belt maintains its protective function while reducing relative speed and stress during carriage traversal.
Solution Approach 2:
A drive mechanism acts as an intermediary between the upper carriage and cover belt, transmitting motion and force to synchronize their movements. This intermediary system enables the cover belt to follow the carriage motion without direct mechanical coupling, reducing stress concentrations.
2Duration of action of moving object
If a smooth cover belt is used, then wear is reduced, but the cover belt cannot effectively guide the fiber web at high speeds
Solution Approach 1:
The cover belt incorporates localized rough sections positioned at critical guidance points where fiber web control is needed, while maintaining smooth surfaces in other areas to minimize overall wear. This selective surface treatment allows the cover belt to provide guidance where necessary without suffering uniform wear across its entire surface.
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
This configuration allows for secure fiber web guidance without turbulence, reduces wear on the cover belt, and enables high line speeds with simplified and cost-effective mechanical solutions, minimizing structural complexity and operational costs.
Implementation Method 1
is configured as a rough web conveyor belt and carries by friction the fiber web resting on it
Data Source
AI summary
The cross lapper for forming a nonwoven fabric from a fiber web includes in its infeed area a smooth cover belt or an array of linear elements spaced a certain distance apart and arranged parallel to each other to cover the fiber web being carried along on the upper run of a first web conveyor belt. The first end section of the cover belt or of the array of linear elements is connected to the upper carriage of the cross lapper. During operation of the cross lapper the fiber web moves along the bottom surface of a cover section of the cover belt or of the array of linear elements. The cross lapper comprises a compensating mechanism to compensate for the changes in the length of the cover section which occur as the upper carriage moves transversely back and forth.