Printing – Rolling contact machines – Rotary
Patent
1984-02-29
1985-01-15
Fisher, J. Reed
Printing
Rolling contact machines
Rotary
101DIG13, B41F 500
Patent
active
044932561
ABSTRACT:
Several embodiments of a voltage applicator device are disclosed for contacting an impression roller in an electrostatically assisted (ESA) printing machine. The voltage applicator device has rolling conductive surfaces which are spaced apart and selectively connected to a voltage source to limit voltage application to the width of one or more partial webs being run through the machine. In the various embodiments, the conductive surfaces outside the web area can be left unconnected, but are preferably grounded or connected to a voltage of opposite polarity, to drain current from portions of the impression roller lying beyond the web. The rolling conductive surfaces can be formed as individual rollers or preferably as a segmented voltage application roller carrying electrical circuitry to connect the conductive surfaces to the voltage source through a roller journal shaft.
REFERENCES:
patent: 2520504 (1950-08-01), Hooper
patent: 3477369 (1969-11-01), Adamson et al.
patent: 3625146 (1971-12-01), Hutchison
patent: 4099462 (1978-07-01), Coberley et al.
Hurletron Altair, Danville, Illinois, Drawing No. 3959-18, Sheets 1 and 2, Jun. 13, 1983.
Hurletron Altair Brochure, "Electrosist System" four pages, date unknown.
Brands George B.
Hyllberg Bruce E.
American Roller Company
Fisher J. Reed
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