| 摘要 |
Apparatus for applying toner to an electrostatic image carried by an insulating surface such as the surface of a copy sheet by contacting the surface with a toner mix comprising toner particles and magnetic carrying particles, which apparatus includes a gate disposed in a position adjacent to the moving surface of a magnetic brush unit on which a magnetic brush of toner mix is continuously formed, disrupted and reformed, the gate being adapted for selective movement by a control means so as to govern the advance of toner mix to a toning station where it contacts the image on the copy sheet. A switch is disposed along the path of the copy sheet and adapted to be actuated by the copy sheet and to control the operation of the gate and the operation of the means driving the electrical brush unit. The apparatus prevents toner mix from contaminating the back side of the copy sheet when the leading end thereof is advanced through the toning station.
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