The present invention relates to a roller grinder comprising two rollers, each mounted on a separate shaft, a fixation means, a guide member, and a first and a second end member. A center of the guide member is rotatably attached to the fixation means in a position, which in a horizontal direction is located centrally between said rollers. Each end of the guide member is attached to a first end of the first and second end members, respectively, by means of a joint, such that both the guide member and the first and second end members can rotate around the joint, and the first and second end members, respectively, are rotatably attached at a second end to a respective one of the shafts.