Patent ID: 7409844

Claim:
A bending apparatus for bending a profile of a metal sheet with upstanding sides ( 11 , 13 ), said apparatus comprising, for each said upstanding side: a rolling device ( 19 , 20 ) with a pair of rollers ( 15 , 16 ; 17 , 18 ) for rolling said upstanding side between said pair of rollers for selectively thinning a part of said upstanding side of said metal sheet for bending said profile of said metal sheet; a device ( 42 ) for adjusting the rolling force of said pair of rollers; and a device ( 40 , 41 ) for adjusting the angle between the axes of said pair of rollers for selectively thinning a part of said upstanding side of said metal sheet for bending said profile of said metal sheet; wherein said rolling devices ( 19 , 20 ) are movably carried by a frame ( 30 ) so as to be movable towards and away from each other along guides ( 31 - 34 ) for adaptation to the width of the profile; and wherein the devices for adjusting the angle between the axes of the rollers and for adjusting the rolling force of the rollers comprise ball screws ( 41 , 42 ) controlled by motors.