Stitching gear assembly having perforating projections thereon, for use in converter adapted to produce pad-like cushioning material, and method
US4968291A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 3, 1989 |
| Grant date | Nov 6, 1990 |
| Priority date | — |
| Expiry date | May 3, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB31D2205/0064
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A gear-like stitching assembly adapted for use in a converter mechanism of the type providing for the production of pad-like cushioning dunnage product from sheet-like stock material which is conventionally disposed in multi-ply, roll form for use with the converter mechanism. The stock material is pulled from the stock roll by the converter and the lateral edges of the stock material are rolled inwardly prior to being formed into the pad-like product. The stitching assembly comprises a pair of rotatable gear-like members adapted to be disposed in coacting, meshed condition, and to stitch confronting and generally abutting rolled edge portions of the sheet-like stock material together by coining, as the latter rolled edge portions pass between the members. The teeth of at least one of the members have projections extending outwardly thereform, for perforating the stock material along the central coined section of the pad-like product, to aid the coined section in maintaining the product in its pad-like form. A novel method is also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.