Methods for operating a delivery device and delivery device for a sheet processing machine

A method for operating a sheet delivery device having a first pile delivery and having a second pile delivery, both being located in a sheet transport direction, wherein a first braking system is provided in an intake region of the first pile delivery in a transport path of sheets that are conveyed by a conveyor system along the sheet transport direction, and a second braking system is provided in an intake region of the second pile delivery, wherein,

• substrate sheets entering the first braking system come into one of form-fitting and friction-locking operative contact with an operative surface of a holding means that is part of the first braking system,
• the operative surface of the holding means of the first braking system, that comes into operative contact with a first substrate sheet, is moved forcibly in the sheet transport direction by a drive, wherein
• in a first operating mode of the first braking system, during the one of the form-fitting and friction-locking interaction between the first substrate sheet and the operative surface of the holding means of the first braking system, and in which the first substrate sheet will be deposited onto a first pile in the first pile delivery, a speed at which the operative surface of the holding means of the first braking system moves is decreased from a first speed to a comparatively lower deposition speed, and
• in a second operating mode of the first braking system, for a subsequently incoming substrate sheet, that will be deposited onto a second pile in the second pile delivery, for at least the entire duration of the one of the form-fitting and friction-locking operative contact between the subsequently incoming substrate sheet and the operative surface of the holding means of the first braking system, that operative surface of the holding means of the first braking system is caused to move at a second speed that corresponds, with a maximum deviation of up to ±10%, to a first conveying speed of the conveyor system.