| 摘要 |
A presser device, applicable to a sanding machine to exert pressure on a workpiece (2) through pneumatic means (3; 3'), comprises: first drive means (31; 31') for applying a first pressure level (P1; P1') to the pneumatic means (3; 3'), second drive means (32; 32') for applying a second pressure level (P2; P2') on the pneumatic means (3; 3'), counterpressure means for creating a counterpressure (PC; PC') designed to move the pneumatic means (3; 3') away from the workpiece (2), and third drive means (33; 33') designed to apply at least a third pressure level (P3; P3'; P4) to the pneumatic means (3; 3').
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