Original Publication Date: 1992-Feb-29
Included in the Prior Art Database: 2004-Apr-05
Xerox Disclosure Journal
Various processes, particularly in the field of migration imaging, require vapor treatment of an imaging plate in an enclosed chamber. It is often desirable to avoid loss of the vapor to the ambient atmosphere during insertion and removal of the plate from the chamber. Some processes require the avoidance of any turbulence in the vapor, minimization of cycling time, and an efficient seal to avoid loss of the treatment vapor. These problems may be overcome by the rotary valve illustrated in the accompanying diagram. Rotary valve 8 comprises a half round sleeve 10 having an arcuate surface which resembles the inner surface of a tube slit in half lengthwise. This half round sleeve 10 forms one wall of a treatment chamber 12 which encloses the treatment vapor. A horizontal slot 14 extends along the length of half round sleeve 10. A rotatable cylinder 16 is provided which is adapted to mate with the arcuate surface of half round sleeve 10. Support trunnions 18 (only one is shown) are secured to each end of cylinder 16. Trunnions 18 are supported by suitable bearings (not shown). Cylinder 16 comprises a mid-section having a half round cross-section with a flat surface 20 extending axially along the mid-section from one cylindrically shaped end 22 to another cylindrically shaped end 24. The valve 8 is in an open position when the flat section 20 is aligned with slot 14. When cylinder 16 is rotated, the curved surface 26-0f cylinder 16 slides over and covers slot 14 thereby closing valve 8. Rotation of cylinder 16 may be effected by any suitable means such as an electric motor, an air operated cylinder, belt drive, chain drive, gear drive, and the like. An air operated cylinder is preferred for a controlled, smooth action in either direction. Timing of rotation of cylinder 16 may be triggered by suitable devices such as micro switches activated by the imaging plate (not shown) to be treated in the treatment chamber 12.