Apparatus for mass compensation at a machine driven by a crank drive

A machine comprising:

• a machine housing;
• a crank drive mounted within the machine housing and including a crankshaft;
• a member connected drivingly to the crank drive so as to be reciprocated thereby along an axis defined by the machine;
• adjustment means whereby the position along said axis of the mean position of said member during reciprocation thereof may be adjusted;
• at least one compensation mass;
• and
• rod means connecting said compensation mass with said member, with said adjustment means and with said crank drive, said rod means including lever means connecting said compensation mass with said member, whereby reciprocation of said member is accompanied by reciprocation of said compensation mass, and the rod means further including a first rod, a second rod, and an elongate double lever having one end hinged directly to said compensation mass, having its other end hingedly connected to said crank drive through said first rod, and being connected at a position intermediate its ends to said machine housing through said second rod, said second rod extending away from said double lever in a direction towards said crankshaft.