and fig4 c the output cylinder 33 the input cylinder 31 consists of a lower roller 310 which is supported via bearing 311 in the bearing arrangement 3 all three bearing arrangements of fig4 a to 4c have a recess 300 in which the push rods 4 extend in part on both sides of the push rods each bearing arrangement is provided with a supporting surface 250 by means of which they bear upon the gliding surface 25 of the basic drafting equipment body 23 the input cylinder 31 and the central cylinder 32 are here capable of displacement on the gliding surface while the output cylinder 33 is attached on the basic drafting equipment body by means of fasteners not shown the input central and output cylinders are understood to be the pairs consisting of upper and lower rollers the bearing arrangement 3 of the input and central cylinder is made in two parts so that two push rods 4 are also required to adjust the bearing arrangement 3 to adjust the input rollers 31 a push rod 4a is provided on the right hand bearing arrangement 3 and a push rod 4a on the left hand bearing arrangement 3 the left hand and right hand bearing arrangements 3 of the input cylinder are connected by screws.