Guiding and carrying elements with throttled blowing air

A device for reducing a frictional force between sheets and a feed table for sheets in a sheet-processing machine, the feed table having an alignment region, the device comprising:

• a separating shoe defining a hollow interior;
• said separating shoe having:
• a sheet surface;
• orifices fluidically connected to said hollow interior;
• and
• a throttle disposed in said hollow interior, said throttle being a plurality of perforated plates disposed one above the other, and swirl chambers being disposed between each of said perforated plates;
• said separating shoe disposed in an alignment region of the feed table;
• said separating shoe to be connected to an air source for blowing air out through said orifices and for generating an air cushion between a sheet and said sheet surface of said separating shoe;
• and
• each of said orifices preceded by said throttle with respect to a direction of air from the air source.

A device for reducing a frictional force between sheets and a feed table for sheets in a sheet-processing machine, the feed table having an alignment region, the device comprising:

• a cover mark defining a hollow interior;
• said cover mark having:
• a sheet surface;
• orifices fluidically connected to said hollow interior;
• and
• a throttle disposed in said hollow interior, said throttle being a plurality of perforated plates disposed one above the other, and swirl chambers being disposed between each of said perforated plates;
• said cover mark disposed in an alignment region of the feed table;
• said cover mark to be connected to an air source for blowing air out through said orifices and for generating an air cushion between a sheet and said sheet surface of said cover mark;
• and
• each of said orifices preceded by said throttle with respect to a direction of air from the air source.

A device for reducing a frictional force between sheets and an auxiliary stack table for sheets in a feeder of a sheet-processing machine, comprising:

• a rake bar defining a hollow interior;
• said rake bar having:
• a sheet surface;
• orifices fluidically connected to said hollow interior;
• and
• a throttle disposed in said hollow interior, said throttle being a plurality of perforated plates disposed one above the other, and swirl chambers being disposed between each of said perforated plates;
• said rake bar to be connected to an air source for blowing air out through said orifices and for generating an air cushion between a sheet and said sheet surface of said rake bar;
• and
• each of said orifices preceded by said throttle with respect to a direction of air from the air source.

A device for reducing a frictional force between sheets and an auxiliary stack table for sheets in a delivery of a sheet-processing machine, comprising:

• a rake bar defining a hollow interior;
• said rake bar having:
• a sheet surface;
• orifices fluidically connected to said hollow interior;
• and
• a throttle disposed in said hollow interior, said throttle being a plurality of perforated plates disposed one above the other, and swirl chambers being disposed between each of said perforated plates;
• said rake bar to be connected to an air source for blowing air out through said orifices and for generating an air cushion between a sheet and said sheet surface of said rake bar;
• and
• each of said orifices preceded by said throttle with respect to a direction of air from the air source.

A sheet-fed rotary printing machine, comprising:

• sheet guiding and carrying devices;
• a sheet transporting element for reducing a frictional force between sheets and said guiding and carrying devices;
• said sheet transporting element cooperating with said sheet guiding and carrying devices to convey sheets in a printing machine;
• said sheet transporting element defining a hollow interior;
• said sheet transporting element having:
• a sheet surface;
• orifices fluidically connected to said hollow interior;
• and
• a throttle disposed in said hollow interior, said throttle being a plurality of perforated plates disposed one above the other, and swirl chambers being disposed between each of said perforated plates;
• said sheet transporting element to be connected to an air source for blowing air out through said orifices and for generating an air cushion between a sheet and said sheet surface of said sheet transporting element;
• and
• each of said orifices preceded by said throttle with respect to a direction of air from the air source.