Device for the edge or center control of moving webs
US4235358A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 27, 1978 |
| Grant date | Nov 25, 1980 |
| Priority date | — |
| Expiry date | Jun 27, 1998 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65H23/038
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
An arrangement for the web edge control comprises a web edge feeler having a sending and receiving nozzles arranged respectively below and above the side edges of the web which is moved includes a motor pump unit for generating the supply air and the fluid pressure for a control diaphragm drive. The control diaphragm drive comprises a diaphragm which is shiftable by pressure changes to operate an adjusting device for shifting the web for example by tilting its rotatable roller support or by shifting the support to one side or the other. The diaphragm is provided with a differential pressure so that one side is admitted in a zero position with the same pressure as the other side during a time at which the sending and receiving nozzles are partially covered by the web edges up to a desired degree for the zero position setting. The air pressure in the receiving nozzle and the diaphragm space which is connected to the receiving nozzle of the web edge feeler is equal to the air pressure on the diaphragm space which is made adjustable by an adjusting throttle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.