Leading/trailing edge detection system having vacuum belt with perforations
US10358307B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 28, 2018 |
| Grant date | Jul 23, 2019 |
| Priority date | — |
| Expiry date | Apr 2, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2215/00616
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A vacuum belt has perforations between belt edges. Some perforations in the vacuum belt are arranged in a pattern. The vacuum belt is positioned adjacent the media supply in a location to move sheets of the print media from the media supply. A light sensor is positioned in a location to detect light passing through the vacuum belt. The light sensor detects a portion of the vacuum belt as limited by an aperture area of the vacuum belt, and the pattern of perforations, and the size and location of the aperture area of the vacuum belt causes the signal output by the light sensor to be constant when the sheets are outside the aperture area of the vacuum belt.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.