double-shear stroke
The multiple movement of the descending knife of a
guillotine. First, there is the downward motion
through the pile being cut; second, the
single-shear motion across the face of the pile;
and third, the double-shear motion where the
cutting edge of the knife starts to cut higher at
one side of the pile and by a rocking motion
becomes approximately parallel when it reaches the
bottom of the cut at the table. The double-shear
stroke thus cuts more like a scissors, with the
knife edge entering each sheet in the pile at its
side and gradually cutting across it. The
advantages of the double-shear stroke are: 1) less
power required to cut: 2) less strain on the
machine and the knife; 3) a more perfectly cut
edge; and 4) a smoother face to the pile. Cf:SINGLE-SHEAR STROKE .
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