| 摘要 |
The invention relates to a device for supplying a vacuum consumer of a sheet processing machine with vacuum in a working cycle of the sheet processing machine. A first valve 2-2''' arranged between an air pressure source and an ejector 3-3''' can be driven by a control unit 1 to be openable and closable during each working cycle, and an air stream having a positive pressure from the air pressure source, which flows through the ejector 3-3''' to an outlet 5 leading to the atmosphere, can be applied to an inlet 4 having a small cross-section in the ejector 3-3'''. A radial connection 6, which leads via a suction line to the vacuum consumer opens into the ejector 3-3''' between the inlet 4 and the outlet 5 of the ejector 3-3'''. The sheet processing machine can be operated with several different working cycles per time unit, and correspondingly a plurality of different opening time points 14 and the respectively associated closing time points 15 of the first valve 2-2''', depending on a corresponding plurality of different numbers of working cycles per time unit, are stored in a storage unit 13 of a control unit 1, and the first valve 2-2''' can be driven by the control unit 1, on the basis of the respective working cycle per time unit to be openable at the associated opening time point 14 and closable at the associated closing time point 15. |
