Notching machine

A notching machine having a vertically moving ram which is provided with a projecting head serving as a tool holder for an upper knife of a blade assembly which further comprises a lower knife that is attached to a machine table, the upper and the lower knives each being provided at a nose formed by two included cutting edges with an identical fixed minimum vertex, comprising:

• an upper set collar for mounting said upper knife to the head of said ram with such an attachment that the upper set collar in common with the upper knife may be turned around a vertical axis of rotation which is in parallel with the longitudinal axis of said ram and extends near the nose of the upper knife;
• a lower set collar for mounting said lower knife to the machine table with such an attachment that the lower set collar in common with the lower knife may be turned around said vertical axis of rotation which extends near the nose of the lower knife, said lower set collar further for serving as an auxiliary supporting table for a work piece;
• and
• means along an axis parallel to said vertical axis of rotation for rigidly connecting the upper set collar with the lower set collar for a common turning of the two knives about their vertical axis of rotation, wherein a notching of said workpiece with a notching angle greater than said fixed minimum vertex of the two knives is accomplished by two successive working strokes of the ram made at two respectively different turning positions of the upper and lower set collars as successively and simultaneously adjusted relative to the workpiece.