| 摘要 |
A system and method for creating a discontinuity in a stack of interfolded sheets in which folding rolls cooperate to interfold staggered sheets supplied in two streams of sheets, each of which is severed from a web of material. When a desired sheet count is attained, a sheet in one of the streams of sheets is folded onto itself so as to create a discontinuity in one of the streams of sheets. The folded sheet is formed by maintaining a leading portion of the sheet in engagement with a separating one roll while maintaining a trailing portion of the sheet in engagement with another roll, with the two rolls being positioned to form a nip therebetween and rotating in opposite directions. Once the sheet has attained a predetermined position on the two rolls, engagement of the leading portion of the sheet with the separating roll is released while engagement of the sheet with the other roll is maintained to define a crease in the sheet, with the leading portion of the sheet being folded back onto the trailing portion of the sheet. The folded sheet forms a gap in the sheet supplied in one of the streams of sheets which, when the sheets are supplied to the interfolding rolls, functions to create a discontinuity in the interfolded stack to facilitate separation of a portion of the stack from the remainder of the stack.
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