Patent ID: 6109084
Filing Date: 2000-08-29
Classification: B21D

Abstract:
An apparatus for stretch-leveling an elongated and thin metal strip beyond its elastic limit, the apparatus comprising:a group of downstream braking rollers, the strip passing between and around the braking rollers without slip;respective differential transmissions interconnecting the braking rollers;a central leveling roller, the strip passing around the leveling roller after leaving the braking rollers;a group of upstream pulling rollers, the strip passing between and around the pulling rollers after leaving the leveling roller without slip;respective differential transmissions interconnecting the pulling rollers; anddrive means connected to the downstream rollers, leveling roller, and upstream rollers for rotating the downstream rollers at a slower peripheral speed than the leveling roller and for rotating the upstream rollers at a faster peripheral speed than the leveling roller, whereby the strip is stretch leveled beyond its elastic limit as it passes from the braking rollers to the leveling roller and as it passes from the leveling roller to the pulling rollers.