Abstract A sheet guide and cooling apparatus for preventing curl in sheets bearing a developed image, the image being permanently fixed to the sheet by application of heat and pressure. The apparatus is positioned to have a flat thermally conductive surface establishing a path for the sheet, downstream of the fixing area, the path extending in a plane substantially coplanar with the plane of sheet travel in the fixing station. Vacuum means associated with the surface maintains successive incremental portions of a sheet in face-to-face contact with the flat surface as it is being guided for at least a predetermined period as the sheet moves along the path and furthermore, provides a flow of cooling air for the surface.
In an apparatus for processing a sheet bearing a developed image, said apparatus having a fixing station for receiving the sheets and rendering said developed image permanently fixed to the sheet by application of heat and pressure, means for establishing a sheet travel path downstream of said fixing station, said path extending in a given plane substantially coplanar with the plane of sheet travel in said fixing station, said means comprising: guide means defining a thermally conductive sheet guide surface parallel to and closely adjacent said given plane downstream of said fixing station, said guide means including an elongated guideplate a series of openings extending therethrough, said guideplate having at least one thermally conductive fin extending therefrom to facilitate cooling of said sheet, said fin being located out of said sheet travel path; and means for positively maintaining successive incremental portions of sheets traveling in said path in face-to-face contact with said sheet guide surface for at least a predetermined period as such sheets move along said path.
Claim 2
Dependent Claim
168 words
In an apparatus for processing a sheet bearing a developed image, said apparatus having a fixing station for receiving the sheets and rendering said developed image permanently fixed to the sheet by application of heat and pressure, means for establishing a sheet travel path downstream of said fixing station, said path extending in a given plane substantially coplanar with the plane of sheet travel in said fixing station, said means comprising: guide means defining a thermally conductive sheet guide surface parallel to and closely adjacent said given plane downstream of said fixing station, said guide means including an elongated guideplate a series of openings extending therethrough, said guideplate having at least one thermally conductive fin extending therefrom to facilitate cooling of said sheet, said fin being located out of said sheet travel path; and means for positively maintaining successive incremental portions of sheets traveling in said path in face-to-face contact with said sheet guide surface for at least a predetermined period as such sheets move along said path.
Claim 3
Dependent Claim
51 words
The invention of claim 1, wherein said sheet guide further comprises a housing surrounding said thermally conductive fins and wherein said means for maintaining successive incremental portions of said sheets in face-to-face contact with said sheet guide surface includes vacuum means communicating with said housing to establish a partial vacuum therein.
Claim 4
Dependent Claim
61 words
The invention of claim 2, wherein said vacuum means includes a conduit open at one end, a vacuum blower connected to said conduit at the other end thereof, a plurality of intercommunicating passages between said conduit and said housing, and means for directing a continuous flow of cooling air at subatmospheric pressure induced by said vacuum blower past said guide surface.