fig1 , 2 and 3 show a traction element 10 with an edge region 16 which extends from the side edge 18 in the width direction , a first roller 12 , a second roller 26 and a guide roller 14 . for purposes of better illustration , the second roller 26 is not shown in fig1 . the traction element 10 is deflected over the second roller 26 and the first roller 12 in the direction of the arrow 20 . the rollers 12 , 26 determine the movement plane of the traction element 10 , wherein the traction element 10 is pre - stressed by the rollers 12 , 26 . in the illustration according to fig2 , the movement plane of the traction element 10 corresponds to the tangential plane which is formed by the rollers 12 , 26 and which is indicated in fig2 by the dashed line 38 . in the movement direction of the traction element 10 in front of the first roller 12 , a guide roller 14 is arranged , the guide roller 14 acting on the surface of the traction element 10 in the edge region 16 thereof and deflecting the edge region 16 out of the movement plane 38 of the traction element 10 before the traction element runs onto the first roller 12 . the traction element 10 runs through here between the guide roller 14 and the first roller 12 . the guide roller 14 has a conical casing shape , wherein the diameter decreases in the width direction of the traction element 10 . the axis 24 of the guide roller 14 extends at an angle relative to the axis 22 of the first roller 12 , with the result that the magnitude of the defection of the edge region 16 decreases continuously starting from the side edge 18 thereof . the width of the deflected edge region 16 is determined by the width of the contact face of the guide roller 14 with the traction element 10 . as is apparent from fig2 , the edge region 16 is deflected out from the movement plane of the traction element 10 , with the result that the traction element 10 runs onto the first roller 12 starting from the first side edge 18 . furthermore , fig1 and 3 show that a lateral offset of the side edge 18 in the direction of the axis 22 of the first roller 12 additionally results from the deflection of the edge region 16 via the guide roller 14 . fig3 shows in this connection oblique running of the traction element 10 which is corrected by the deflection of the edge region 16 . in order to illustrate better the magnitude of the lateral offset 42 of the side edge 18 , fig3 shows a dashed line 40 which indicates the course of the side edge 18 , as it would be if not for the deflection of the edge region 16 by the guide roller 14 . as can also be discerned from the illustration in fig3 , the first roller 12 and the second roller 26 are mounted so as to be rotatable between two side elements 28 , 30 . the guide roller 14 is , on the other hand , mounted in a cantilevered fashion on just one of the side elements 28 . the side elements 28 , 30 can , for example , be components of a frame of a round baler ( not illustrated ). fig4 shows a further embodiment of the device which is illustrated in fig3 and in which , in addition to the traction element 10 , a second traction element 110 , a second guide roller 36 and a third guide roller 120 are also provided . the traction element 10 has , in addition to the edge region 16 , a second edge region 32 on the opposite side , which second edge region 32 extends from the second side edge 34 of the traction element 10 in the direction of the width thereof or in the direction of the side edge 18 . the second traction element 110 and the third guide roller 120 are arranged in mirror - symmetrical fashion with respect to the traction element 10 and the guide roller 14 in fig4 , wherein the second traction element 110 also has two edge regions 112 , 116 which extend from the side edges of the traction element 110 . the edge region 112 of the second traction element 110 is assigned here to the third guide roller 120 , wherein the latter is deflected by the third guide roller 120 , like the edge region 16 of the traction element 10 . in order to avoid repetitions , reference is therefore made to the description of fig1 to 3 . the function of the guide roller 14 which extends along the axis 24 and deflects the edge region 16 of the traction element 10 corresponds here to the function of the third guide roller 120 which extends along the axis 124 and which deflects the edge region 112 of the second traction element 110 . the second guide roller 36 , which is in the shape of a double cone , is arranged between the two traction elements 10 , 110 . each of the traction elements 10 , 110 is assigned here a conical section 44 , 122 , wherein the conical section 44 deflects the second edge region 32 of the traction element 10 , and the second conical region 122 deflects the second edge region 116 of the second traction element 110 . the axis 46 of the second guide roller 36 extends here essentially parallel to the axis 22 of the first roller 12 . the adjacent second edge regions 32 , 116 of the traction element 10 , 110 which run one next to the other are deflected by the second guide roller 36 in the same way as the edge region 16 of the traction element 10 . reference is made in this respect to the description of fig1 to 3 . having described the preferred embodiment , it will become apparent that various modifications can be made without departing from the scope of the invention as defined in the accompanying claims .
a belt tracking control device for a conveyor device is provided , in particular for agricultural round balers , having at least one roller and at least one traction element which is guided over the roller and having at least one edge region which extends from the side edge of the traction element in the direction of the width thereof . at least one guide roller is provided through which the edge region can be deflected from the movement plane of the traction element .