| 摘要 |
A toner head is disclosed for applying liquid toner to a moving record medium having a latent electrostatic image thereon, in which the contact surface of the head is curved in a cylindrical form to ensure proper engagement of the record medium during toning. Since the toner is circulated through the system by a vacuum pump arrangement, pressure relief means are provided to prevent an inward deflection of the record medium that could choke off toner flow during periods when the record medium is not moving over the toner head. In one embodiment, the toner head comprises a plurality of identical modules which are oriented alternately in opposite directions, so that some serve as toner inlet stations and some as exhaust stations. A toner clean-off head having a cylindrically curved contact surface is also disclosed. |
