Method and apparatus for stacking paperboard blanks
US3938674A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 9, 1974 |
| Grant date | Feb 17, 1976 |
| Priority date | — |
| Expiry date | Sep 9, 1994 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S414/103
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A method of stacking corrugated paperboard blanks issuing from a corrugator that produces parallel streams of blanks from an advancing endless web by shingling the blanks from each of the streams and advancing them to lineally displaced stacking stations where a predetermined number of blanks are accumulated and then interrupting the flows of blanks for removing stacks of blanks from the stacking stations. Suitable apparatus for performing the method includes vertically displaced, parallel shingling conveyors which advance the shingled blanks to lineally displaced stacking platforms and a gating apparatus at the downstream end of each conveyor to interrupt the flow of blanks while the stacks are removed from the platforms. The output end of the lower conveyor rises to compensate for the increasing height of the stack on its associated platform while the other platform falls to similarly compensate for the increasing height of the stack thereon. The input end of each conveyor falls beneath the level of incoming blanks while the conveyors are stopped during removal of the stacks so that storage stacks are temporarily formed on the conveyors until they resume advancement of the blanks…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.