shaft 42 and can be shifted on it in the direction of the double arrow 45 in this way one roller pair 53 or 53 u2032 is shifted by the offset 2 as soon as it is produced by the offset generating device 10 being swiveled around the axis 33 which is supported in the housing 26 by the angle u03b1 the invention has been described in detail with particular reference to certain preferred embodiments thereof but it will be understood that variations and modifications can be effected within the spirit and scope of the invention 13 guide roller pair s in the plane of transport path section 5 13 u2032 guide roller pair s in the plane of transport path section 7 13 u2033 guide roller pair s in the plane of transport path section 6 21 surface of the transport belt section of the offset generating means 28 coupling of the connecting rod to the bearing of the guide roller pair 13 u2033 29 axis of rotation of the bearing of the guide roller pair 13 u2033 33 axis around which the offset generating means can be swiveled 40 u2032 deflection roller for the transport belt working in the opposite direction 41 u2032 axis of the deflection roller 40 u2032 working in the opposite direction 46 double arrows rotary motion of the offset generating means 47 double arrows swiveling of the guide roller bearing 30 48 guide of the bearing 30 on the offset generating means 53 53 u2032 roller pairs for transport belts u03b1 swiveling angle of the offset generating means u03b2 angle of the surface of the offset generating means to the.