Electrophotographic machine with efficient transfer

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(11)

EP 0 388 342 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	07.08.1991 Bulletin 1991/32

(43)	Date of publication A2:
	19.09.1990 Bulletin 1990/38

(21)	Application number: 90480013.3

(22)	Date of filing: 02.02.1990

(51)	International Patent Classification (IPC)⁵: G03G 15/16

(84)	Designated Contracting States:
	DE FR GB IT

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Priority:

17.03.1989 US 324837
25.09.1989 US 412650

(71)	Applicant: International Business Machines Corporation
	Armonk, N.Y. 10504 (US)

(72)	Inventors:
	Bell, Roger Wayne Lousville, Colorado 80027 (US) Ehn, Dean Steward Boulder, Colorado 80301 (US) Fox, Sidney Jared Boulder, Colorado 80303 (US) Gibson, David Kent Boulder, Colorado 80303 (US) Ries, Michael David Westminster, Colorado 80021 (US) Rosati, Alfonso Armando Longmont, Colorado 80501 (US) Velarde, Ronald Gene Longmont, Colorado 80501 (US)

(74)	Representative: Bonin, Jean-Jacques
	Compagnie IBM France Département de Propriété Intellectuelle F-06610 La Gaude F-06610 La Gaude (FR)

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References cited: :

(54)	Electrophotographic machine with efficient transfer

(57) An electrophotographic machine with a transfer corona generator (13) for producing ionic flow to the backside of print paper to electrostatically attach the paper to the photoreceptive image bearing surface (12). The machine includes a flexible support member (40-44) which is movably mounted to mechanically press the print paper against the photoreceptive surface within the transfer zone, preferably at or near the region of peak transfer charge distribution. In that manner, charge from the transfer corona attaches the print paper to the photoreceptive surface at the line of release from the mechanical pressure applied by the flexible support member and thereby eliminates voids in the transfer of toner to print paper caused by air gaps between the paper and the photoreceptive surface.

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