| 摘要 |
A pressing tool ( 13 ) includes a fluid pump ( 4 ), a cylinder element ( 5 ) arranged connecting with this and a piston which can be slid forward in the cylinder element ( 5 ) by pressure fluid of the fluid pump ( 4 ) and reset by a return spring ( 20 a). A piston rod ( 6 ) is passed out to the cylinder element ( 5 ) as an activation part. The pressing tool ( 13 ) is moreover outfitted with a position measuring device ( 12, 12 a; 112, 212, 212 a) which measures without contact which makes the piston position continuously detectable over a positioning range free of disturbance and with a presence sensor ( 52 ). The presence sensor ( 52 ) verifies the presence of a jointing clamp ( 51 ) and issues an indicator signal in the event that a jointing clamp ( 51 ) is missing or improperly fastened and shuts the pressing tool ( 13 ) off following a delay period to the extent that no orderly inserted jointing clamp ( 51 ) is yet available. The pressing tool ( 13 ) can also characterize the quality of the extrusion on the basis of the comparison of a detected maximal piston end position with a specified piston position range value.
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