Prefeeder for stacked sheets of paperboard products
US5423657A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 22, 1993 |
| Grant date | Jun 13, 1995 |
| Priority date | — |
| Expiry date | Apr 22, 2013 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65H2701/1764
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
An improved prefeeder assembly for shingling planar sheets in which a sheet stack is positioned on a prefeeder lift conveyor which lowers the sheet stack into a floor pit to incrementally elevate the sheet stack. A block pusher assembly sequentially pushes bock segments to a conveyor assembly where a shingling assembly shingles the sheets. A bottom sheet removal assembly having an in-path diverter plate contacts and diverts only the bottom sheet of the bottommost block segment as this block segment is being shingled. As shingled sheets are discharged to other process equipment, a tamping assembly tamps the sheet edges for uniform restacking.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.