초록 ▼

Contactless support guides serve to create a cushion of pressurized air to hold a web of material such as paper spaced from a support face. The support face can be curved to transport the web through an angular deviation. The support face contains a large number of shallow pockets at least some of w

Contactless support guides serve to create a cushion of pressurized air to hold a web of material such as paper spaced from a support face. The support face can be curved to transport the web through an angular deviation. The support face contains a large number of shallow pockets at least some of which emit air to create the cushion. Special additional pockets or slats are provided to create zones of higher pressure in the regions of the cushion where the web enters and exits the guide.

대표청구항 ▼

A contactless support guide for guiding a moving web of material; said guide comprising means defining an arcuate support face for controlling the moving web; a multiplicity of first pockets in the support face, the first pockets being distributed over the support face to substantially fill the face

A contactless support guide for guiding a moving web of material; said guide comprising means defining an arcuate support face for controlling the moving web; a multiplicity of first pockets in the support face, the first pockets being distributed over the support face to substantially fill the face; apertures in said first pockets for emitting air; further elongate pockets provided in the support face at marginal regions where the web enters and exits the guide; a plurality of closely spaced apertures in each of the further pockets for emitting air; and air supply means, including a manifold, for receiving pressurized air and for supplying said air to the apertures of the first and further pockets to create an air cushion extending around the support face to support the moving web in a generally uniform spaced relationship relative to the support face; wherein the further pockets are angled towards the first pockets and the apertures in the further pockets are larger than the apertures in the first pockets to produce zones of higher pressure in the air cushion at said marginal regions where the web enters and exits the guide.