| 摘要 |
<p>A stamping machine tool having working parts in the form of one or several matrices and one or several stamps, and a blank-holder guiding the stamp(s) in its(their) displacements and securing in position against this or these matrices during the working stroke, a sheet metal piece subjected to a form shaping operation and wherein there is provided between the matrices and the stamp(s) a blank-holder that performs at least one normal working stroke and two withdrawal strokes, at will, namely a normal withdrawal stroke and an intervention withdrawal stroke which allow a dismantling of the working parts of the tool while on the machine.</p> |
