Variable ratio feedhead plenum
US5707056A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 28, 1995 |
| Grant date | Jan 13, 1998 |
| Priority date | — |
| Expiry date | Sep 28, 2015 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65H2511/20
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A vacuum corrugation feeder used to feed a wide variety of sheet sizes and stocks includes a variable ratio feedhead plenum. Included within vacuum plenum is an adjustable shutter apparatus that includes a foam roller mounted for rotation on shaft. A shutter member in the form of a plastic sheet is connected to the foam roller and can be wrapped and unwrapped around the foam roller by rotation of knob that is connected to the shaft depending on whether the vacuum pressure is to be high or low. The foam roller is mounted above a plenum plate of the vacuum plenum such that rotation of the knob in a clockwise direction causes the shutter to unwrap from the foam roller and partially cover vacuum holes in the plenum plate and thereby decrease the amount of negative pressure from the vacuum plenum that reaches sheets being fed. Manipulation of the knob in a counterclockwise direction removes the shutter from covering the holes in the plenum plate and thereby increasing the negative pressure to the sheet while simultaneously wrapping the shutter around the foam roller.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.