Patent ID: 7326166
Filing Date: 2008-02-05
Classification: B65H

Abstract:
1. A method for folding a sheet of paper, comprising: supplying a sheet between a pair of folding rollers rotating in an input rotation sense, the sheet having a first section and a second section wherein the second section precedes the first section in the supplying of the sheet between the folding rollers; causing the first section of the sheet to buckle into a loop by, during rotation of the folding rollers in the input rotation sense, stopping with respect to portions of the sheet transported between the folding rollers a portion of the sheet remotely downstream of the folding rollers; bending the second section of the sheet situated between opposite ends of the sheet on a side of the loop remote from the folding rollers to a folding nip formed by and between the folding rollers, the bending producing a bent portion; rotating the folding rollers in an output rotation sense opposite to the input rotation sense, whereby sections of the folding rollers in the area of the folding nip transport said bent second section of the sheet into the folding nip; and transporting the bent portion of the sheet through the folding nip, whereby a first fold is formed in said second section of the sheet and subsequently a trailing end of the loop is deformed into a second fold; wherein said supplying of the sheet between the folding rollers is at a first side of the folding nip, and said bending of the sheet is towards a second side of the folding nip opposite said first side.