Interfolding machinery improvement
First Claim
Patent Images
1. An improvement for use in machinery for interfolding porous cut sheets comprising:
- two adjacent and counter-rotating folding rolls each having projecting tuckers and recessed grippers arranged alternately and timed such that a tucker on one folding roll mates with a gripper on the other folding roll in the folding rolls nip, wherein the mating tucker on one roll holds a trailing edge of a first cut sheet by vacuum means on its leading surface and a leading edge of a second cut sheet by vacuum means on its trailing surface and the mating gripper on the other roll carries a mediate portion of a third cut sheet by vacuum means such that the mediate portion of the third cut sheet is interfolded with the trailing edge of the first cut sheet and the leading edge of the second cut sheet as the cut sheets pass the folding rolls nip.
1 Assignment
0 Petitions
Accused Products
Abstract
An improvement for use in machinery for interfolding porous cut sheets is disclosed having two adjacent and counter-rotating folding rolls each having projecting tuckers and recessed grippers arranged alternately on the folding rolls such that a tucker on one roll mates with a gripper on the other. Porous cut sheets are selectively adhered to the folding rolls by vacuum ported to the tuckers and grippers.
52 Citations
6 Claims
-
1. An improvement for use in machinery for interfolding porous cut sheets comprising:
- two adjacent and counter-rotating folding rolls each having projecting tuckers and recessed grippers arranged alternately and timed such that a tucker on one folding roll mates with a gripper on the other folding roll in the folding rolls nip, wherein the mating tucker on one roll holds a trailing edge of a first cut sheet by vacuum means on its leading surface and a leading edge of a second cut sheet by vacuum means on its trailing surface and the mating gripper on the other roll carries a mediate portion of a third cut sheet by vacuum means such that the mediate portion of the third cut sheet is interfolded with the trailing edge of the first cut sheet and the leading edge of the second cut sheet as the cut sheets pass the folding rolls nip.
- View Dependent Claims (2, 3, 4, 5)
-
6. A method of interfolding porous web material comprising:
-
(a) rotating two adjacent folding rolls towards each other, each having projecting tuckers and recessed grippers arranged alternately and positioned such that a tucker on one roll engages a gripper on the other roll in the nip between the folding rolls; (b) alternately feeding sheets cut from a web to the folding rolls ahead of the folding rolls nip such that each sheet is positioned on a folding roll with; (i) a leading and trailing edge of that sheet retained by vacuum at successive tuckers on that folding roll, and (ii) a mediate portion of that sheet retained by vacuum at the gripper intermediate the leading and trailing edge retaining tuckers; (c) removing vacuum from each tucker as it passes through the folding rolls nip such that the leading and trailing edges of sheets previously retained by that tucker are transferred from one folding roll to the other and subsequently retained by the engaging gripper on the other folding roll; (d) removing vacuum from the engaging gripper after that gripper has passed the folding rolls nip; and (e) thereafter stacking the interfolded cut sheets.
-
Specification