Method and apparatus for folding sheets of paper
AssigneeNeopost Limited
InventorHerman Sytema
Life of this patent
Estimating the term…
Abstract
For folding a sheet of paper, a portion of the sheet situated between opposite ends of the sheet is bent to a folding nip between a pair of folding rollers. By rotating the folding rollers in an output rotation sense, whereby sections of the folding rollers in the area of the folding nip transport the bent portion of the sheet into the folding nip, and transporting the bent portion of the sheet through the folding nip, a fold is formed in the bent portion of the sheet. Prior to the rotation of the folding rollers in the output rotation sense, at least a portion of the sheet is supplied between the folding rollers by rotating the folding rollers in an input rotation sense opposite to the output rotation sense. An apparatus for folding is also described.
Claims12
A method for folding a sheet of paper, comprising:
- supplying a sheet between a pair of folding rollers rotating in an input rotation sense;
- causing the first section of the sheet to buckle into the 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 a 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 between a pair of folding rollers;
- 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.
An apparatus for folding a sheet of paper, comprising:
- a pair of folding rollers which define a folding nip situated therebetween;
- a drive coupled with the folding rollers, with a control for rotating the folding rollers in an input rotation sense for supplying at least a portion of the sheet through the folding nip;
- a stop downstream of the folding rollers, for, during rotation of the folding rollers in the input rotation sense for supplying the sheet, stopping a portion of the sheet with respect to portions of the sheet transported between the folding rollers, causing a first section of the sheet to buckle into a loop;
- means for bending a second section of the sheet situated between opposite ends of the sheet on a side of the loop remote from the folding rollers to the folding nip;
- and
- the drive coupled with the folding rollers, with the control being arranged for subsequently rotating the folding rollers in an output rotation sense opposite to the input rotation sense, whereby the bent portion of the sheet is transported through the folding nip and a first fold is formed in said second section and subsequently a trailing end of the loop is deformed into a second fold.
Dependencies are inferred from the claim text.