between the driving pulley 15 and the follower pulley 14 the driving belt 13 is driven along with the rotation of the driving pulley 15 the rear jogger fixing portion 17 has a through hole in the central part the guide shaft 16 is inserted into the through hole of the rear jogger fixing portion 17 to support the rear jogger fixing portion 17 slidably the rear jogger fixing portion 17 is fixed to the driving belt 13 and moved along the guide shaft 16 in the paper width direction when the driving belt 13 is driven the rear jogger 19 is always located above the paper loading table 5 and moved back and forth in the paper width direction as the rear jogger fixing portion 17 is slid the rear jogger 19 is controlled with its position by the control unit 100 to regulate the position of paper in the paper width direction and position the paper on the paper loading table 5 the rear jogger position detecting sensor 18 reads the information regarding the position of the rear jogger 19 from a position detection mark such as a slit cut on the driving belt 13 the rear jogger position detecting sensor 18 sends the information of the read position detection mark to the control.