Compact air bar assembly for contactless web support
US4425719A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 15, 1982 |
| Grant date | Jan 17, 1984 |
| Priority date | — |
| Expiry date | Mar 15, 2002 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65H2406/112
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
An assembly of air bars from which air is blown against a lengthwise moving web to contactlessly confine it to a plane comprises a header having a ported wall extending along its full length, parallel to said plane. Each of a series of outlet ports along the ported wall opens into an air bar intermediate its ends. A centrifugal blower has its cylindrical rotor near a rear end of the header, spaced to the side of said ported wall remote from the plane. An internal plenum chamber in the header opens to the outlet ports in the rear one-third to one-half of the header. The blower has one outlet near the rotor periphery from which air flows into the front part of the header and another outlet, spaced at a greater distance from the rotor periphery, from which air flows into said plenum chamber. The header is movable toward and from said plane relative to the blower, for air bar retraction to facilitate web threading.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.