lithrone 428, probleme with touch cylinder

Hello,
I am student and within the framework of my training course in company I met a machine komori lithrone 428, 4 colors, that this has a problem when we let the touch of the cylinder barboteur against the cylinder measuring glass, there is a harshness which seems broken sleep superior of the measuring glass and tear him(it) and creates hurts in the cylinder making him(it) unusable. Not knowing the site I do not put a photo but me can it.

This text is a translation, excuse me for the low level of my english

thank's / Cordialement

 

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