Development housing with simultaneous pickup and trim

(19)

(11)

EP 0 596 640 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	24.08.1994 Bulletin 1994/34

(43)	Date of publication A2:
	11.05.1994 Bulletin 1994/19

(21)	Application number: 93308528.4

(22)	Date of filing: 26.10.1993

(51)	International Patent Classification (IPC)⁵: G03G 15/09, G03G 15/08

(84)	Designated Contracting States:
	DE FR GB

(30)

Priority:

02.11.1992 US 971002

(71)	Applicant: XEROX CORPORATION
	Rochester New York 14644 (US)

(72)	Inventors:
	Hart, Steven C. Webster, New York 14580 (US) Edmunds, Cyril G. Webster, New York 14580 (US)

(74)	Representative: Goode, Ian Roy et al
	Rank Xerox Ltd Patent Department Parkway Marlow Buckinghamshire SL7 1YL Marlow Buckinghamshire SL7 1YL (GB)

(56)

References cited: :

(54)	Development housing with simultaneous pickup and trim

(57) An apparatus which advances developer material to an electrostatic latent image recorded on a photoconductive member (10). The apparatus uses a magnetic roll (85) having a rotating tubular member (80) with a stationary magnet (84) disposed interiorly thereof to attract developer material thereto. The magnet is substantially V-shaped and generates a strong magnetic field over one region (84c) to hold the developer material on the tubular member, and a weak magnetic field over the remaining region (84d) to release the developer material therefrom. Opposite polarity magnetic poles (84a,84b) are impressed on the legs of the magnet. A trimming blade (82), positioned adjacent the tubular member opposed from one of the magnetic poles (84a), regulates the thickness of the developer material as it is being loaded on the tubular member.

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