Patent ID: 8876682

Claim:
A folding device ( 100 , 200 ) for folding a paper web ( 102 , 202 ) in the longitudinal direction, comprising: a first rolling device ( 104 , 204 ) adapted to receiving the paper web from a supplying device ( 110 ), a fold-creating means ( 106 , 206 ) adapted to creating at least one fold along the paper web, a fold-pressing means ( 108 , 209 ) adapted to pressing together portions of the paper web which are separated by said fold, a second rolling device ( 109 , 209 ) adapted to receiving and guiding the folded paper web out from the fold-creating means ( 106 , 206 ) to a receiving device ( 112 ), and at least a first and a second motor ( 114 , 214 , 116 , 216 ) which are connected to a control unit ( 120 ) and are adapted to driving the paper web through the folding device and to maintaining through the control unit, by detecting in conjunction with the control unit the electrical characteristics of the motors when they are driving the paper web, a predetermined tension in the paper web independent of its speed through the folding device as well as when the paper web is stationary.