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Web Guiding

Control circuit / Types of guiding

The BST control circuit

The scope and level of automation of web guiding systems differ from application to apllication. Regardless of this, every guiding system can be reduced to the principle of the simple closed control circuit.
BST Control Circuit Web MaterialsThe starting point is the current position of the web of material .

SensorsOne or more sensors scan the actual position of the web and transmit this information to the commander.

The CommanderThe commander compares the actual position measured to the specified desired value. If there is a difference it transmits a correction signal to the guiding device.

Guiding DeviceThe guiding device corrects the position of the web of material precisely and without any apparent delay.

Web Edge Guiding

Web edge guiding:

Guiding to the left or right web  edge using one edge sensor.

Types of guiding

The type of guiding is dependent on the degree of web processing. Untreated webs can only be guided to the web edge, as there are no other contrasting characteristics available. Finished webs, on the other hand, offer more possibilities, for instance printed lines or other freely selectable contrasts. The scanning of the web position is made using analogue or digital sensors.

Web Center Line Guiding

Web center-line guiding:

Guiding to the web center-line using two edge sensors.

Contrast GuidingContrast guiding:

Guiding to a continuous or interrupted printed line or contrast edge.

 

BST web guiding components: overview

BST Web Guiding Components
Controlled unwinding CCD camera
Infrared or ultrasonic sensor Controlled rewinding
BST guiding device: Rotating frame guide BST commander
BST guiding device: Swivel roll guide

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