Patent ID: 7971500

Claim:
A sheet metal cylinder ( 1 ) with an axis of rotation (a) and a synchronization profile extending in an axial direction (a) which is manufactured by shaping sheet metal, wherein the synchronization profile ( 4 , 5 ) is discontinued in an axial direction in a supporting element region of a profile flank of the synchronization profile ( 4 , 5 ) and transitions, in the supporting element region, into a circumferential supporting element ( 6 ) which is an axial segment of the profile flank without any synchronization profile ( 4 , 5 ), the circumferential supporting element has a continuously exterior curved axial profile that is continuous with the synchronization profile so that the circumferential supporting element ( 6 ) facilitates absorbing operational strain, which extends in a tangential direction, during rotation of the sheet metal cylinder ( 1 ), an external diameter (Da) of the circumferential supporting element ( 6 ) is equal to an external diameter (Da) of the synchronization profile ( 4 , 5 ) so the central area of the sheet metal cylinder ( 1 ) forms a constant diameter annular ring which extends normal to the axis of rotation (a) of the sheet metal cylinder ( 1 ), and a thickness of the circumferential supporting element ( 6 ) is equal to a thickness of the sheet metal from which the sheet metal cylinder ( 1 ) is manufactured.