Edge location measuring head
US4680806A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 17, 1985 |
| Grant date | Jul 14, 1987 |
| Priority date | — |
| Expiry date | Jun 17, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01B11/028
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A measuring head for detecting the location of an object such as a moving sheet of paper is disclosed. An elongated sensor having multiple light-sensitive elements is located perpendicular to the path of the object. A source of light is directed at the sensor, and those light-sensitive elements which are not in the shadow of the object produce a high output, while those in the shadow produce a low output. Circuit means are provided to provide a count of the elements and to store the count corresponding to the transition between the high and low values. This stored count, which represents the location of the object, is then displayed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.