Patent ID: 8104178

Claim:
A cutting head ( 1 ) for an electric hair cutting machine ( 4 ), comprising: one lower shearing blade ( 2 ) and one upper shearing blade ( 3 ) fixedly joined to one another, wherein each of said lower shearing blade and said upper shearing blade includes a shearing serration; a slit disposed between said lower shearing blade ( 2 ) and said upper shearing blade ( 3 ) wherein the shearing serration of the lower shearing blade is separated from the shearing serration of the upper shearing blade; a cutting blade ( 5 ) comprising cutting teeth ( 6 ) and made from a flat material ( 7 ) having a substantially constant thickness (S) between opposite blade surfaces, the cutting blade configured to be driven in oscillation in opposite cutting directions that are substantially parallel to said blade surfaces, wherein said slit forms a guide that receives the cutting blade ( 5 ), wherein the cutting blade ( 5 ) is disposed between the lower and upper shearing blades and is configured to oscillate relative to the lower and upper shearing blades ( 2 , 3 ), wherein said cutting teeth correspond to said shearing serrations on said lower shearing blade and said upper shearing blade and cooperate with said shearing serrations to cut hair, and wherein the thickness (S) of the cutting blade ( 5 ) is approximately 0.1 to 1.0 mm; and a hair length cut adjuster ( 9 ) configured to adjust the relative positions of the blades by moving the lower shearing blade ( 2 ) and the upper shearing blade ( 3 ) relative to the cutting blade ( 5 ), wherein the lower shearing blade ( 2 ) and the upper shearing blade ( 3 ) are adjustable relative to the cutting blade ( 5 ) in a direction that is substantially parallel to said blade surfaces and perpendicular to the cutting directions.