Vorrichtung zum Einspannen von Gegenständen für die Spindel einer Werkzeugmaschine

摘要

An article clamping apparatus is designed to compulsorily open the front end portions of divided pieces of a collet and to allow the divided pieces of the collet to securely hold a pull stud of a tool holder. A draw bar is fitted into a spindle of the machine tool, and a support sleeve is disposed to surround the draw bar via the collet. A separator is disposed on the front side of the support sleeve and fixed to the spindle together with the support sleeve. The positioning plates provided on the separator are engaged with slit grooves of the support sleeve and inserted between the divided pieces of the collet. Upon advancement of the draw bar, the divided pieces are advanced, so that the front end slat surfaces of the divided pieces contact the slant surfaces of the collet opening projections provided on the separator so as to compulsorily open the front portions of the divided pieces. Subsequently, the engagement portion of the pull stud is inserted into the front portion of the collet, and the draw bar is retracted, so that the engagement portion of the pull stud is engaged with the front inside projections of the divided pieces.