Abstract: A device for aligning box blanks in a box blank processing machine including a frame supporting a lengthwise guiding rail, an upper carrier and lower carrier which are directly interconnected by brackets and have one end pivotably mounted to the frame adjacent an exit end of the device so that the entrance end of the carriers can be spaced from the rail to provide a lateral movement of a blank against the rail. The position of the entrance end of the carriers is adjustable relative to the guide rail. The upper carrier preferably is formed of a series of rollers and the lower carrier has a series of rollers supporting a belt which is driven by a drive pulley.