Toner developing ability measuring system for electrostatography

Details Toner developing ability measuring system for electrostatography Toner developing ability measuring system for electrostatography

1979-07-16

1981-05-05

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

118691, G01N 2100

Patent

active

042661412

ABSTRACT:
A powdered developer (26) comprising carrier and toner particles is caused to flow by gravity downwardly through a passageway (71). A transparent electrode (62) is disposed in the passageway (71). A light source (64) and photosensor (66) are arranged on opposite sides of the electrode (62) for sensing an amount of attracted toner. The electrode (62) is first de-energized and cleaned by aprtially restricting the passageway (71) below the electrode (62) and allowing developer (26) to accumulate in the passageway (71) from the restriction upwardly past the electrode (62) while a restricted amount of developer (26) flows downwardly through the restriction. Then, the restriction is removed and the passageway (71) blocked above the electrode (62), allowing the accumulated developer (26) to flow downwardly past the electrode (62). Then, the passageway (71) is completely unblocked and the electrode (62) energized with an electric potential causing toner to be attracted thereto. After a predetermined length of time the passageway (71 ) above the electrode (62) is blocked and the output of the photosensor (66) indicates the amount of toner attracted to the electrode (62) and thereby the developing ability of the developer (26). The output of the photosensor (66) after cleaning the electrode (62) may be compared with the final output to provide a reference valve which is compensated for variables such as electrode contamination, electric potential variation and the like.

REFERENCES:
patent: 3727065 (1973-04-01), Maksymiak
patent: 4043293 (1977-08-01), Ruckdeschel
patent: 4111151 (1978-09-01), Ruckdeschel

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