Photocopying – Projection printing and copying cameras – Combined with or convertible to a contact printer
Patent
1978-04-10
1980-01-15
Braun, Fred L.
Photocopying
Projection printing and copying cameras
Combined with or convertible to a contact printer
430 30, 250559, 356448, G03G 1500
Patent
active
041836570
ABSTRACT:
A system for checking copy quality variables within the image area of an electrophotographic machine. During a test cycle, quality is checked by producing sample test areas within the photoconductor image area ordinarily used for producing copies. Reflectance measurements are made on the sample test areas and compared to a dynamically floating reference achieved by a reflectance measurement from a cleaned portion of the photoconductor within the image area. The testing circuit is balanced so that the same reflectance voltage should be generated whether the single reflectivity-sensing device is viewing a sample test area or a cleaned reference area. The system checks for quality variables such as toner concentration, image voltage and an abnormally low reflectance photoconductor and provides a partial check on its own fault-free condition during periods when it is not in use.
REFERENCES:
patent: 2956487 (1960-10-01), Giaimo
patent: 3094049 (1963-06-01), Snelling
patent: 3348521 (1967-10-01), Hawk
patent: 3348522 (1967-10-01), Donohue
patent: 3348523 (1967-10-01), Davidson et al.
patent: 3354802 (1967-11-01), Doucette et al.
patent: 3611982 (1971-10-01), Coriale et al.
patent: 3640615 (1972-02-01), Schaeffer
patent: 3647293 (1972-03-01), Queener
patent: 3647295 (1972-03-01), Dobouney
patent: 3700323 (1972-10-01), Guyette et al.
patent: 3719165 (1973-03-01), Trachienberg et al.
patent: 3719169 (1973-03-01), Cade et al.
patent: 3724942 (1973-04-01), Gibson et al.
patent: 3778146 (1973-12-01), Knapp
patent: 3780299 (1973-12-01), Bock
patent: 3783818 (1974-01-01), Makino et al.
patent: 3801196 (1974-04-01), Knapp et al.
patent: 3834807 (1974-09-01), Fuller et al.
patent: 3850662 (1974-11-01), Jahn
patent: 3893414 (1975-07-01), Hudson
patent: 3901593 (1975-08-01), Kogiso et al.
patent: 3911861 (1975-10-01), Griesmer
patent: 3911865 (1975-10-01), Volkers
patent: 3914045 (1975-10-01), Namiki et al.
patent: 3926338 (1975-12-01), Reyner
patent: 3927641 (1975-12-01), Handa
patent: 3928764 (1975-12-01), Bock et al.
patent: 4026643 (1977-05-01), Bergman
patent: 4082445 (1978-04-01), Steiner
Smith, G. L., "Toner Concentration Control", IBM Technical Disclosure Bulletin, vol. 19, No. 11, Apr. 1977, pp. 4078 and 4079.
Ernst Larry M.
Seigal Steven D.
Van Cleave George W.
Braun Fred L.
International Business Machines - Corporation
Rohrer Charles E.
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