Abstract: A web-steering mechanism, particularly for the endless belt of a xerographic copier, uses two rolls to hold the belt under tension. An idler roll is designed to rotate about an axis which is at a small angle to a tilt axis of the idler roll assembly. Small tilting movements of the idler roll assembly, under the control of a servo-motor are effective to alter the angle at which the web enters and/or leaves the roll, to cause the web to walk along the tilted roll.

Abstract: Apparatus for supplying a liquid to a heated surface includes a distribution gallery arranged to supply the liquid to the surface. The liquid is supplied from the gallery through a series of spaced orifices each of which opens into an individual drop-forming chamber above the surface, the dimensions of each orifice and drop-forming chamber being such that some liquid always remains in each of said orifices over the range of temperatures from ambient to that of the heated surface. A pump delivers the liquid to the distribution gallery, which is situated above, and spaced from, a wick in contact with the surface.