Method and apparatus for folding and sealing a floppy disc envelope
US4272235A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 24, 1978 |
| Grant date | Jun 9, 1981 |
| Priority date | — |
| Expiry date | Nov 24, 1998 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB31B2241/007
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A center fold is produced in a floppy disc envelope by partially folding a pre-cut sheet of polyvinyl chloride (PVC) having two spaced center holes. The center holes are forced over a precision pedestal affixed to a flat support surface. A first fold bar is lowered against the partially folded sheet, flattening first and second sections of the sheet on each side of a fold line against the support surface, producing a fold of controlled radius. A heat lamp is utilized to anneal the fold for a predetermined time, after which the fold bar is raised. A flap extending from the first section of the sheet is folded back against the second section of the sheet by means of an apparatus including a flat support, a precision pedestal for aligning and retaining the partially folded envelope, and a second fold bar having a lip for engaging the edge of the flap. The second fold bar moves along an arcuate path controlled by a four bar linkage, folding the flap back against the second section and simultaneously forcing the fold end of the flap against a resilient pad adjacent a rigid stop attached to the support surface, producing a permanent end fold having a controlled radius of curvature. The f…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.