Method and apparatus for controlling tension in a moving material
US4341335A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 7, 1980 |
| Grant date | Jul 27, 1982 |
| Priority date | — |
| Expiry date | Oct 7, 2000 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65H23/1888
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
Method and apparatus for controlling tension in a longitudinally moving web between fixed material feeding points while maintaining the length of the path of web movement between said fixed points substantially constant. Two axially fixed, web-feeding rollers are positively driven from a common drive motor. One roller is driven at a variable speed through a shaft-mounted transmission unit having a variable pitch pulley spaced from the axis of rotation of the roller shaft and connected to the motor by a flexible belt. Fluid piston means provides a constant force on the transmission unit in a direction about the roller shaft axis to impose a constant torque on the variable speed roller and to move the variable pitch pulley to increase or decrease the speed of the roller, thereby maintaining a constant imposed tension on the material in its path of movement between the two rollers. In a further embodiment, web tension variations upstream of the two feed rollers is controlled by an upstream displaceable roller which moves in response to upstream tension variations in the web to move the transmission unit about the feed roller shaft axis and vary the speed of the feed roller to maintain…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.