cutter blade 22 over its entire length in this position of the needle 28 the movable cutter blade 17 extends substantially parallel to the fixed cutter blade 21 as shown in fig2 the cutting attachment holder 1 is mounted in standardized threaded bores in the working or operating surface 24 of the sewing machine by means of the threaded bolt 22 and the centering pin 23 or equivalent structure during this operation the clamping bolt 25 or the like at the needle bar 27 engages the slot like or slotted opening 10 of the drive fork 5 in case that the needle 28 is its raised position the movable cutter blade 17 and the fixed cutter blade 21 are then arranged to form a maximum opening angle u03b1 with respect to each other no further changes have to be made at the sewing machine in the position as shown in fig1 a length of material 30 to be operated upon or processed by the sewing machine is introduced into the opening angle u03b1 formed by the movable cutter blade 17 and the fixed cutter blade 21 and the sewing machine is started when the needle 28 is lowered the drive fork or fork member 5 and conjointly therewith the drive cam support or carrier 6 are.