Draw off control system for a roll of material
US4245793A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 24, 1979 |
| Grant date | Jan 20, 1981 |
| Priority date | — |
| Expiry date | Jul 24, 1999 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65H2403/7253
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
The disclosure relates to a draw off control system for a roll of material in which a pivoted arm carries one end of a roller around which the material is passed to pull the arm in one direction, the arm being counter-balanced by a pneumatically operated thruster having a plunger acting on the arm. The force provided by the thruster varies with projection of the plunger so that as the material tension varies over a certain range the arm will move to establish a new equilibrium position. Movement of the arm in one direction with falling tension is arranged to apply a brake to the feed roller of the material when the arm moves beyond a certain position, the brake is applied to increase tension, the brake being released when the arm returns past said position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.