本发明涉及一种用于片状材料（1）对准的方法。 通过旋转元件（25），其中，所述片材（1）被翻转为正面打印和背面围绕其中心轴线其对准。 在薄片材料（1），其前边缘的匝（23）保持在其对准位置。 在传送平面（9）的一对传感器（30）被容纳，优选构成为与该圆弧状的材料（1）的转弯处，相同的横向边缘后（24）对齐的CCD行传感器，如在片材的对齐操作（1） 之前把它的绕其中心轴旋转。

The invention relates to a method for aligning the sheet material (1). Its alignment via rotation elements (25), wherein the arc-shaped material (1) is turned over for printing on the front and back about its central axis. At turn of the sheet material (1) the front edge (23) remains in its aligned position. In the conveying plane (9) a pair of sensors (30) is accommodated, preferably configured as a CCD line sensor with which the arc-shaped material (1) after the turn at the same lateral edge (24) is aligned, as in the aligning operation of the sheet material (1) prior to its turn around its central axis.