Device for turning sheet-like substrates

Abstract

A turning unit for sheet-like substrates has at least one first turning element with a basic body having an outer, round substrate contact surface for deflecting the substrate. The deflection is from a first sheet conveying direction to a second sheet conveying direction describing a predetermined angle to the first sheet conveying direction. Furthermore, a channel structure is provided that is formed in the substrate contact surface and onto which open a plurality of gas outlet openings which are in fluid communication with a gas supply.

1 . Turning unit for a substrate sheet with at least one turning element having the following:
 a basic body with an outer, round substrate guide surface angled relative to a sheet conveying direction;   a channel structure provided in the substrate guide surface, wherein the channel structure has channels distributed statistically in the substrate guide surface; and   a plurality of gas outlet openings opening onto the channel structure and which can be supplied with gas in order to provide a gas flow towards the channel structure.   
     
     
         2 . The turning unit according to  claim 1 , wherein at least two turning elements arranged angled relative to a sheet conveying direction and to one another. 
     
     
         3 . (canceled) 
     
     
         4 . The turning unit according to  claim 1 , wherein at least some of the gas outlet openings open onto at least one transverse channel. 
     
     
         5 . (canceled) 
     
     
         6 . The turning unit according to  claim 1 , wherein the substrate guide surface has a plurality of separate channel structure segments with a respective channel structure arranged adjacently over a width of the substrate guide surface, where a respective channel structure is in fluid communication with at least one gas outlet opening. 
     
     
         7 . The turning unit according to  claim 1 , further including a control unit which is able to supply gas to the gas outlet openings individually or in groups. 
     
     
         8 . The turning unit according to  claim 1 , further including a cavity inside the basic body which is in fluid communication with the gas outlet openings and which can be supplied with gas. 
     
     
         9 . The turning unit according to  claim 8 , further including at least one slide in the cavity, the slide being movably mounted such that it permits selective supplying of gas to gas outlet openings via the cavity. 
     
     
         10 . The turning unit according to  claim 9 , wherein two sliders are provided that are movable from opposite ends into the cavity. 
     
     
         11 . The turning unit according to  claim 7 , characterized by a plurality of valves for individual or grouped supply of gas to gas outlet openings. 
     
     
         12 . The turning unit according to  claim 6 , wherein the gas inlet opening(s) associated with a respective channel structure segment can be supplied with gas in groups. 
     
     
         13 . The turning unit according to  claim 1 , wherein the channel structure extends over a maximum of 180° in the circumferential direction of the substrate guide surface. 
     
     
         14 . The turning unit according to  claim 1 , wherein the channel structure has a depth of 0.1-1 mm. 
     
     
         15 . The turning unit according to  claim 1 , wherein the gas outlet openings have a diameter of 0.3-0.5 mm. 
     
     
         16 . (canceled) 
     
     
         17 . Turning unit for a substrate sheet with at least one turning element having the following:
 a basic body with an outer, round substrate guide surface angled relative to a sheet conveying direction;   a channel structure provided in the substrate guide surface, wherein the channel structure has a plurality of circumferential channels spaced apart and extending in the circumferential direction of the round substrate guide surface, and at least one transverse channel extending transversely to the circumferential channels and being in fluid communication with at least two circumferential channels; and   a plurality of gas outlet openings opening onto the channel structure and which can be supplied with gas in order to provide a gas flow towards the channel structure.   
     
     
         18 . The turning unit according to  claim 17 , wherein at least some of the gas outlet openings open onto at least one transverse channel. 
     
     
         19 . The turning unit according to  claim 17 , further including a control unit which is able to supply gas to the gas outlet openings individually or in groups. 
     
     
         20 . The turning unit according to  claim 19 , wherein the gas inlet opening(s) associated with a respective channel structure segment can be supplied with gas in groups. 
     
     
         21 . The turning unit according to  claim 17 , further including a cavity inside the basic body which is in fluid communication with the gas outlet openings and which can be supplied with gas. 
     
     
         22 . The turning unit according to  claim 21 , further including at least one slide in the cavity, the slide being movably mounted such that it permits selective supplying of gas to gas outlet openings via the cavity. 
     
     
         23 . The turning unit according to  claim 17 , wherein the channel structure extends over a maximum of 180° in the circumferential direction of the substrate guide surface. 
     
     
         24 . The turning unit according to  claim 17 , wherein the channel structure has a depth of 0.1-1 mm. 
     
     
         25 . The turning unit according to  claim 17 , wherein the gas outlet openings have a diameter of 0.3-0.5 mm.