| 摘要 |
An automatic clamping device for clamping a slab (90) of rigid material onto the worktable (18) of an operating machine comprises a central body (42) terminating at both ends in a bottom cavity (72) and a top cavity (77) each having a suction cup function and being intended to engage, respectively, with the table (18) and the slab (90). The bottom cavity (72) is designed to engage with a through-hole. (30) formed in the thickness of said table (18) and communicating with an air suction duct (26, 28) in turn connected to an air suction source, so as to form a single air suction circuit, the through-hole (30) being associated with shut off valve (32) and closing member 36 for interrupting communication between the cavity (72) and the suction source. The central body (42) also has, formed therein, an inner cylindrical chamber (56) housing a piston (58) associated with a stem (60) acting as a closing member movable, together with the piston (58), between a first position where it prevents fluid communication between the bottom cavity (72) and die top cavity (77) and a second position where it allows said communication with the sole air suction circuit, causing clamping, via the suction cup effect, of the slab (90) to die central body (42) of the automatic clamping device (40). |
