stretcher lapper where it is converted by folding into a lap 6 of width l transported out of the stretcher lapper by an exit conveyor 8 the web 4 consists of fibers essentially directed parallel to its length the exit conveyor 8 can transport the formed lap 6 to a needler not shown the direction of transport of the web 4 and of the lap 6 are indicated in fig1 by the respective arrows f and k for reference purposes the side 7 adjacent to the face by which the web 4 enters will be called the 34 front side 34 of the stretcher lapper and the side 9 opposite the front side 7 the 34 rear side 34 of the stretcher lapper the interior of the stretcher lapper is shown diagrammatically in the elevation view of fig2 taken in a plane q see fig1 perpendicular to the direction of transport of the lap 6 out of the stretcher lapper by the exit conveyor 8 in addition to the front transporter 2 the stretcher lapper comprises a second transporter conveyor 5 called a rear transporter the transporters 2 and 5 represented by unbroken lines in fig2 have the same width and have their lateral edges in the same planes parallel to the plane q of fig2 the front transporter 2 follows a closed path defined by cylindrical guide rollers 32 to 43 the rear transporter 5 follows a closed path defined by cylindrical guide rollers 60 to 69 the guide rollers 32 to 43 and 60 to 69 are mounted pivotably about respective axes which are all horizontal and perpendicular to the plane q of fig2 that is to say substantially parallel to the direction of.