| 摘要 |
This invention is a two-color unitary application and vacuuming head for a liquid toner electrostatic printing system. There is a body having three planar faces angularly displaced from one another concentrically about a pivot point, one of the faces being a first toner face having openings therein communicating with a first network of toner passages in the body, a second of the faces being a second toner face having openings therein communicating with a second network of toner passages in the body, a third of the faces being a vacuum face also having individual openings therein communicating respectively with a third network of toner passages in the body and with a fourth network of toner passages in the body. A pivot pin supports the body for pivotal movement about the pivot point and there is apparatus for pivoting the body about the pivot pin between a first position with the first toner face in contact with a printing media being printed upon by the printing system, a second position with the vacuum face in contact with the printing media, and a third position with the second toner face in contact with the printing media.
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