Web tensioning system
US4363457A · kind A · utility
7Cited by
3References
1Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 4, 1980 |
| Grant date | Dec 14, 1982 |
| Priority date | — |
| Expiry date | Nov 4, 2000 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65H23/1806
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A system is described for holding the tension of a web substantially constant as the web is transported from a supply spool to a take-up spool. The rotation of each spool is controlled by a motor. A tension control circuit senses the currents in both motors and alters motor current so as to hold the sum of the motor currents at a substantially constant value. In this manner, the sum of the torques generated by the motors and their spools is held at a substantially constant value to thereby maintain web tension substantially constant as the radii of the spools change during web movement.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.