Powder transfer marking device and method for sign plates

摘要

A marking device and marking method are described for sign plates in which toner is transferred from a toner transfer surface (2) to the raised portions (9) of an embossed sign plate (8) which is moved forwards by means of a conveyor (12). To prevent compact areas (52) of toner developing in the toner layer (24), a decompacting device (20) is provided which may include a roller (22) and a structured surface (23). Surface (23) may be provided by a textile material with a velvety nap. Further, areas of toner (51) which have been transferred to raised areas (9) may be partially removed by the action of the decompacting device (20). Toner (6) is lightly adhered to the toner transfer surface by the tribo-charge effect of a doctor roller (7) which meters toner (6) from a hopper (5).