Modes of position control

Untreated material webs can by guided by the web edge only as there are no other regular contrast differences available.

Treated webs, however, may be guided by a printed line, a color contrast, a water mark or by any other freely-selectable contrast.

Manual sensor positioning by the web edge

Web guiding by the l.h. or by the r.h. web edge.

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Manual sensor positioning - center line guidance

Web guiding by the mean center line of the web / of the machine.

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Motorized sensor positioning by the web edge

Web guiding by the l.h. or by the r.h. web edge.

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Motorized sensor positioning by the centerline - symmetric

Guiding by the mean web center line / machine center line with symmetric sensor follow-up (hybrid control).

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Lamination by web edge with one positioning support

Lamination of two differen webs by the web edges with the assistance of a positioning support and with litte distance between the scanning position on the master and the scanning position on the slave.

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Lamination by the web edge with two positioning supports

Lamination of two webs by the web edges with two positioning supports/CCD cameras with a bigger space between the scanning position on the master and the scanning position on the slave.

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Lamination by the web center line with two positioning supports

Lamination of two webs by the centerline of the webs using two positioning supports/two CCD cameras.

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Web oscillation - motorized

Periodic oscillation of the web by motorized shifting of the edge sensor.

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Web oscillation within the sensor measuring range

Periodic web oscillation by shifting the position target value within the measuring range of the edge sensor.

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Web width measurement

Web width measurement by capturing both web edges, motorized positioning support.

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Erhardt+Leimer Limited / Products / Web Guiding and Spreading systems for textiles ELSMART / Modes of position control