Browse Prior Art Database

Sheet Removal from a Drum

IP.com Disclosure Number: IPCOM000089030D
Original Publication Date: 1977-Sep-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 2 page(s) / 29K

Publishing Venue

IBM

Related People

Battison, AH: AUTHOR [+3]

Abstract

Sheets are stripped from a vacuum drum by the application of a single jet of fluid against the leading edge of the attached sheet.

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Sheet Removal from a Drum

Sheets are stripped from a vacuum drum by the application of a single jet of fluid against the leading edge of the attached sheet.

Referring to the figure, a stripper bar 1 conforms along its edge to the contour of drum 2, but is spaced sufficiently from the rotating drum surface to allow an attached sheet 3 to pass. Bar 1 is sloped downwardly relative to the drum axis to effect progressive peeling of the sheet during removal. At the desired time for removal, a jet of pressurized air is applied through nozzle 4 to lift the corner of the sheet from the drum so that it passes onto the surface of the stripper bar. The air jet may be terminated and the sheet will continue to peel from the drum surface over the stripper bar during rotation. This technique of removal eliminates the criticality of timing the air jet and does not damage the sheet. In addition, sheet removal controls are less complex and there is little noise or required maintenance.

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