Smoothing device for flat printing materials

A smoothing device, comprising:

• guide surface sections for a flat printing material having a leading edge being pulled with positive guidance in a direction of travel over said guide surface sections;
• throttling ducts pressurized with compressed air during operation, said throttling ducts being formed by at least one channel communicating with at least one inlet opening and at least one outlet opening and by a filter acting between said at least one inlet opening and said at least one outlet opening;
• said guide surface sections having openings formed therein, said throttling ducts discharging into said openings formed in said guide surface sections;
• a flow duct;
• and
• said guide surface sections forming a smoothing notch and having at least one air passage opening formed therein, said at least one air passage opening communicating with said flow duct, and said at least one air passage opening being configured to cause pressure conditions upon presence of an air throughflow during operation causing the flat printing material to form a bead projecting into said smoothing notch.

A smoothing device, comprising:

• guide surface sections for a flat printing material having a leading edge being pulled with positive guidance in a direction of travel over said guide surface sections, said guide surface sections having openings formed therein;
• a chamber having a compressed-air connection, said chamber forming one of said guide surface sections;
• throttling ducts pressurized with compressed air during operation, said throttling ducts being formed by a throttling insert adjoining said openings of said guide surface sections, said throttling insert acting between said openings and said compressed-air connection, said throttling ducts discharging into said openings formed in said guide surface sections;
• a flow duct;
• and
• said guide surface sections forming a smoothing notch and having at least one air passage opening formed therein, said at least one air passage opening communicating with said flow duct, and said at least one air passage opening being configured to cause pressure conditions upon presence of an air throughflow during operation causing the flat printing material to form a bead prolecting into said smoothing notch.

A smoothing device, comprising:

• guide surface sections for a flat printing material having a leading edge being pulled with positive guidance in a direction of travel over said guide surface sections;
• throttling ducts pressurized with compressed air during operation;
• said guide surface sections having openings formed therein, said throttling ducts discharging into said openings formed in said guide surface sections;
• a flow duct;
• said guide surface sections forming a smoothing notch and having a plurality of air passage openings provided along said smoothing notch, said air passage openings communicating with said flow duct, and said air passage openings being configured to cause pressure conditions upon presence of an air throughflow during operation causing the flat printing material to form a bead projecting into said smoothing notch;
• said smoothing notch having an extent substantially transverse to the direction of travel, said air passage openings form a central group and edge groups with respect to said extent of said smoothing notch;
• and
• said central group communicating directly with said flow duct, and said edge groups communicating indirectly with said flow duct via said throttling ducts.

A smoothing device, comprising:

• guide surface sections for a flat printing material having a leading edge being pulled with positive guidance in a direction of travel over said guide surface sections, said guide surface sections forming a smoothing notch and having air passage openings formed therein;
• said air passage openings being configured to cause pressure conditions upon presence of an air throughflow during operation causing the flat printing material to form a bead projecting into said smoothing notch;
• throttling ducts pressurized with compressed air during operation;
• said guide surface sections having openings formed therein, said throttling ducts discharging into said openings formed in said guide surface sections;
• a flow duct, said air passage openings communicating with said flow duct;
• further guide surface sections upstream from said smoothing notch with respect to the direction of travel, said further guide surface sections forming a further smoothing notch and having further air passage openings formed therein;
• said further air passage openings being configured to cause pressure conditions when there is an air throughflow during operation such that the flat printing material forms a further bead projecting into said further smoothing notch;
• further throttling ducts pressurized with compressed air during operation;
• and
• a further flow duct, said further air passage openings communicating with said further flow duct via said further throttling ducts.