Method for alignment of sheet-like materials

Abstract

The invention relates to a method for the alignment of sheet-like material ( 1 ). Its alignment occurs via rotation elements ( 25 ), wherein the sheet-like material ( 1 ) is rotated around its central axis in order to print on the front and backsides. During the rotation of the sheet-like material ( 1 ) around its central axis, the material's leading edge ( 23 ) remains in its aligned position. Into the conveyor surface ( 9 ) is incorporated a sensor pair ( 30 ), preferably in the form of CCD line sensors, with which the sheet-like material ( 1 ) is aligned on the same lateral edge ( 24 ) following the rotation, as is the case during the alignment procedure of the sheet-like material ( 1 ) before it is rotated around its center axis.

1 . Method for aligning sheet-like materials ( 1 ), wherein the alignment is performed by means of rotation elements ( 25 ) and the sheet-like material ( 1 ) is rotated around its middle axis, in order to print the front and back sides, wherein the leading edge ( 23 ) of the sheet-like material ( 1 ) remains in its aligned position, characterized in  
       that a conveyer surface ( 9 ) contains a sensor pair ( 30 ), with which the sheet-like material ( 1 ) is aligned on the same lateral edge after it has been rotated around its middle axis, just as during the alignment process of the sheet-like material ( 1 ) prior to its rotation around its middle axis.  
     
     
         2 . Method according to  claim 1 , characterized in  
       that the sensor pair ( 30 ) is provided in the conveyer surface ( 9 ) within the areas of the lateral edges ( 24 ) of the sheet-like material ( 1 ).  
     
     
         3 . Method according to  claim 1 , characterized in  
       that the same measuring point is always used for aligning the sheet-like material ( 1 ) on the lateral edge ( 24 ).  
     
     
         4 . Method according to  claim 1 , characterized in  
       that the determination of the position of the lateral edge ( 24 ) of the sheet-like material ( 1 ) occurs by means of a sensor array of the sensor pair ( 30 ) that is oriented perpendicularly to the feed direction ( 22 ) of the sheet-like material ( 1 ).  
     
     
         5 . Method according to  claim 1 , characterized in  
       that two CCD line sensors ( 30 ) are included in the determination of the lateral alignment of the sheet-like material ( 1 ).  
     
     
         6 . Method according to  claim 1 , characterized in  
       that the alignment of the sheet-like material ( 1 ) occurs in the area of the lateral edges ( 24 ) that borders on its leading edge.  
     
     
         7 . Method according to  claim 5 , characterized in  
       that during the rotation of the sheet-like material ( 1 ) around its middle axis, an exchange of position of the lateral edges ( 24 ) occurs, while the position of the leading edge ( 23 ) of the sheet-like material is retained.  
     
     
         8 . Arrangement for the alignment of sheet-like material ( 1 ), wherein the alignment of the sheet-like material ( 1 ) is undertaken by means of rotation elements ( 25 ), and the sheet-like material ( 1 ) is rotated around its center axis in order to print on the front and back sides, wherein the leading edge ( 23 ) of the sheet-like material ( 1 ) remains in its aligned position, characterized in  
       that a sensor pair ( 30 ) in the form of lines, which enables the alignment of the sheet-like material ( 1 ) on the same lateral edge ( 24 ) of the sheet-like material following its rotation around its central axis, is incorporated into the upper conveyor surface ( 9 ).  
     
     
         9 . Printing press with a feeding arrangement for sheet-like material ( 1 ), wherein the alignment of the sheet-like material ( 1 ) occurs by means of rotation elements ( 25 ) and the sheet-like material ( 1 ) is rotated around its central axis in order to print on the front and back sides, wherein the leading edge ( 23 ) of the sheet-like material ( 1 ) remains in its aligned position, characterized in  
       that a sensor pair ( 30 ), with which the sheet-like material ( 1 ) is aligned on the same lateral edge ( 24 ) following the rotation around its central axis, as is the case during the alignment procedure of the sheet-like material before it is rotated around its central axis, is incorporated into a conveyor surface ( 9 ).  
     
     
         10 . Digital printing press with a feeding arrangement for sheet-like material ( 1 ), wherein the alignment of the sheet-like material ( 1 ) occurs by means of rotation elements ( 25 ), and the sheet-like material ( 1 ) is rotated around its central axis in order to print on the front and back sides, wherein the leading edge ( 23 ) of the sheet-like material ( 1 ) remains in its aligned position, characterized in  
       that a sensor pair ( 30 ), with which the sheet-like material ( 1 ) is aligned on the same lateral edge ( 24 ) following the rotation around its central axis, as is the case during the alignment procedure of the sheet-like material ( 1 ) before it is rotated around its center axis, is incorporated into a conveyor surface ( 9 ).  
     
     
         11 . Electro-(photo)graphic printer with a feeding arrangement for sheet-like material ( 1 ), wherein the alignment of the sheet-like material ( 1 ) occurs by means of rotation elements ( 25 ), and the sheet-like material ( 1 ) is rotated around its central axis in order to print on the front and back sides, wherein the leading edge ( 23 ) of the sheet-like material ( 1 ) remains in its aligned position, characterized in  
       that a sensor pair ( 30 ), with which the sheet-like material ( 1 ) is aligned on the same lateral edge ( 24 ) following the rotation around its central axis, as is the case during the alignment procedure of the sheet-like material ( 1 ) before it is rotated around its center axis, is incorporated into a conveyor surface ( 9 ).