Web monitoring and control apparatus for web handling machinery
US4186309A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 13, 1977 |
| Grant date | Jan 29, 1980 |
| Priority date | — |
| Expiry date | Oct 13, 1997 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65H2557/512
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An improved web monitoring and control apparatus is disclosed for use with web handling machinery, such as printing presses and the like which are of the type that have a generally continuous web of material being printed or otherwise processed. The apparatus directs modulated infrared energy onto the web and detects the reflection of the energy from the web. The apparatus detects the occurrence of a web break and shuts down the machinery. The apparatus includes an automatic arming control which activates the apparatus when the machinery moves the web at some preselected percentage of its total speed and also includes apparatus for detecting when the detector lens has become soiled and provides a warning to the operators that conditions are approaching which may result in a false web break detection which would shut down the machinery.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.