| 摘要 |
<p>In a notching machine an upper knife is attached by an upper set collar to the head of a vertically moving ram for being turnable around an axis of rotation lying near the nose of the upper knife. The upper set collar is connected through a fixed axis parallel to the axis of rotation with a lower set collar for a common turning around the same axis of rotation. The lower set collar being provided for the attachment of a lower knife and serving as an auxiliary table for workpieces to be notched. The two knives have an equal minimum vertex of, for example, 30 DEG so that with a first working stroke of the ram in a first turning position of the upper and lower set collars and their knives, respectively, this minimum vertex may be notched into the workpieces lying on the auxiliary table and afterwards with a second working stroke of the ram this minimum vertex may be enlarged to any desired larger notching angle up to for example around 120 DEG in a second turning position of the knives.</p> |
