| 摘要 |
An ink supply unit for an offset printing machine includes an ink fountain roller and a distributing roller spaced from and rotating faster than the ink fountain roller. A rotatable transfer roller oscillates between a first position in contact with the ink fountain roller and a second position in contact with the distributing roller. A rotatable auxiliary roller is moveable between a first working position spaced from the ink fountain roller and the distributing roller and a second working position in operative ink transfer relation with the ink fountain roller. In the first working position the auxiliary roller interferes with the movement of the transfer roller toward the ink fountain roller to slow the rotation of the transfer roller before contact with the ink fountain roller. In the second working position of the auxiliary roller, the transfer roller is maintained in contact with the auxiliary roller and the distributing roller.
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