| 摘要 |
A milling machine for forming drilling extremities on screw blanks. The milling machine comprises a plurality of article-milling stations, each of which is provided with milling-cutters respectively which are pivotally displaceable relative to each of the stations. A feeding assembly is utilized for continuously feeding articles in dwell-free relation successively to each of the milling stations and is controlled by a motor unit so as to feed the articles to and away from the article-milling stations respectively in dwell-free relation at a rapid accelerating withdrawal rate away from each of the article-milling stations and a rapid decelerating approach rate toward each of the article-milling stations. The milling-cutters are pivoted into a cutting position respectively and remain in the position as the article-feeding unit feeds screw blanks slowly into contact with each of the cutters at a rate suitable for material removal. The cutters are then pivotally displaced away from the cutting positions and the screw blanks are rapidly displaced away from the cutting station to again be acted upon at a second milling station, wherein the rate of feed will again be reduced but never stopped. |
