(under subclass 15) Device wherein the material which is moved is a web* and the control means comprises a pair of rollers* placed for engagement with longitudinal* areas of opposing web surfaces closely adjacent the side edges of the web.
(1) Note. For definition of surfaces and side edges, see definitions of "web" in the Glossary in the class definition.
(2) Note. The rollers are usually positioned angularly with respect to the longitudinal direction of web travel.
