Crank scissors having two pairs of blades for cutitng rolling strips

Crank shear, especially for cutting rolled strip, which comprises two pairs of blades that can be mounted on blade holders, wherein the blade holders are supported opposite each other in a vertical plane in a pair of eccentric drive shafts and are pivoted on torque supporting levers in double-joint mechanisms in interaction with two hydraulic control units that act on these double-joint mechanisms, wherein the blade holders form axially parallel pairs of bearing surfaces for the pairs of blades on approximately radial projections, with the upper pair of blades arranged on inner, facing bearing surfaces of a curved recess of the upper blade holder, and with the lower pair of blades arranged only on outer, oppositely directed bearing surfaces of a projection oriented towards the recess, the projection being relatively smaller and formed as a single piece with the lower blade holder, each blade of the lower pair of blades having a completely exposed surface facing away from the other blade of the lower pair of blades, wherein the completely exposed surface is an entire face of the blade, each of the blades of the lower pair of blades being independently attached to the lower blade holder, wherein the upper blade holder and the lower blade holder are of non-identical construction.