Electrostatic printing machine with improved toner fountain and

Details Electrostatic printing machine with improved toner fountain and Electrostatic printing machine with improved toner fountain and

1974-03-07

1976-02-10

Stein, Mervin

Coating apparatus

With vacuum or fluid pressure chamber

118429, 118DIG23, C23C 1308

Patent

active

039371778

ABSTRACT:
An improved toner fountain and recovery system for an electrostatic printing machine includes a fountain and supply arrangement for applying fluid toner material to a surface of a web of print material passing across the fountain and a vacuum-operated recovery head disposed to extend transversely of the path of movement of the web and in a manner whereby the recovery head removes toner from the surface of the web. A column of toner fluid forms a fluid head in fluid communication with a flow passage coupled to the recovery head in a manner permitting the height of the hydraulic head to establish the degree of vacuum applied to the recovery head. A valve operable between open and closed positions retains the head of toner responsive to arrested movement of the web so as to close the valve and retain the head of toner while the web is at rest.

REFERENCES:
patent: 3413143 (1968-11-01), Cameron et al.
patent: 3470848 (1969-10-01), Dreher
patent: 3690917 (1972-09-01), Hershoff et al.

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