Web feed mechanism and door with static protrusions
US4790467A · kind A · utility
5Cited by
4References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 25, 1986 |
| Grant date | Dec 13, 1988 |
| Priority date | — |
| Expiry date | Mar 25, 2006 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J11/30
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A feed mechanism for moving a web is disclosed. It includes a means for engaging the web that has a plurality of uniformly spaced drive pins for extending through and engaging web perforations. It also includes a means for guiding the web onto the drive pins, such as a door, and it includes a guiding surface that extends below the upper end of the pins. The guiding surface includes a static protrusion that extends below the guiding surface and urges the web and its associated perforation down onto the drive pin in that portion of the tractor where the drive pins are inserted into the web perforations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.