System information

Function

ELROLLER steering roller systems correct the web position already in the infeed plane. They consist of a fixed base frame and a moving guide frame. The latter accommodates one or two positioning rollers and swivels around an imaginary pivot point in the infeed plane. The pivot point should, on the one hand, be far enough away from the infeed roller to ensure the web correction does not influence the infeed roller. On the other hand, it must be far enough away from the positioning roller to ensure the elasticity of the web is fully exploited but not overstrained. A steering roller is termed a proportional actuator. It must therefore operate in a friction-locked manner and must not permit any sliding between the web and the positioning roller.

Area of use

ELROLLER systems are always used where there is a long infeed path for process-related reasons.

Application

Depending on the space available, steering rollers may be fitted with one or two positioning rollers. On versions with one positioning roller, the web is guided with wrapping of 90°. On versions with two positioning rollers, less wrapping is possible. In this case, the web runs in almost the same plane as the outfeed roller.

The following applies when mounting an ELROLLER: the infeed path should be the equivalent of two to three times the web width, the exit path should be the equivalent of between 50 and 100 percent of the web width. The sensor should be positioned behind the positioning roller, as near to it as possible. As a consequence, improved control dynamics are achieved thanks to the resulting short response time.

Legend

A-A = Web tension distribution at infeed | B-B = Web tension distribution at exit | K = Web correction | a = Correction angle | σ1 = Basic web tension | σ2 = Tension distribution due to pivoting movement of roller frame at the infeed | σ3 = Tension distribution due to pivoting movement of roller frame at the exit | 1 = Pivot point | 2 = Infeed roller | 3 = Positioning roller(s) | 4 = Sensor | 5 = Locking roller | L1 = Infeed path to the pivot point | L2 = Infeed path to the steering roller | L3 = Infeed path | L4 = Exit path

 

 

Web guiding systems

Steering roller system SRB33

Compact steering roller system with one or two rollers for different wrap angles and wear-free, brushless drive technology

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Steering roller system with 2 rollers SRB63

Compact steering roller system with two rollers for S-wrapping and a maximum web tension of 5,000 N

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Steering roller system with 3 rollers SRB63

Compact steering roller system with three rollers for omega wrapping and a maximum web tension of 20,000 N

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System components

Infrared edge sensor PoE FR 54

Infrared edge sensor based on the principle of retroreflection with a measuring range of ±10 mm and a resolution of 0.02 mm

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Infrared wide band sensor FE 46

Digital infrared wide band sensor for web center detection, web edge detection, and width measurement with a tube distance (clear width) of 160 mm

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CCD camera OL 82

Interruption-free detection of web edges, position detection, web guiding, material detection, and width measurement

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Command station DO 42

Visualization and operation of web guiding systems with multiple operation of up to 255 web guiding control loops

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Data network center DN 40

Data network center for central connection of all components in a control system

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Linear drive unit EL.MOTION AG 72

Linear drive unit EL.MOTION AG 72

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Actuating drive AG 90

Linear actuating drive with wear-free, brushless drive technology with a maximum actuating force of 800 N

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Linear drive unit EL.MOTION AG 91

Linear actuating drive with wear-free, brushless drive technology with a maximum actuating force of 1000 N

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Linear drive unit EL.MOTION AG 93

Linear actuating drive with wear-free, brushless drive technology with a maximum actuating force of 3000 N

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Linear drive unit EL.MOTION AG 96

Linear actuating drive with wear-free, brushless drive technology with a maximum actuating force of 5500 N

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Actuating drive STO AG 9__2

Linear actuating drive with wear-free, brushless drive technology for functional safety

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