Apparatus for measuring developer density by reflected light fro

Details Apparatus for measuring developer density by reflected light fro Apparatus for measuring developer density by reflected light fro

1992-01-17

1995-01-17

Grimley, A. T.

Photocopying

Contact printing

Light boxes

355208, 355245, G03G 2100

Patent

active

053830075

ABSTRACT:
Apparatus for measuring developer density comprising, a developer agitator section agitating a developer, a rotational conveying member conveying the developer in the developer agitator section with its rotation, a transparent detection window facing the developer agitator section, a plurality of magnets being fixed on the rotational conveying member, and retaining the developer, and causing the developer to be brought into contact with the transparent detection window with a rotation of the rotational conveying member, a density detection section measuring the developer density on the basis of reflected light by illuminating the developer retained on the magnets, and caused to be brought into contact with the detection window, and the magnets including at least one cleaning magnet, and the density detection section is situated in a passage of the developer which is conveyed so as to be circulated through first agitator passage adjacent to a development section and second agitator passage behind the first agitator passage, and between a passage for conveying the developer from the first agitator passage to the second agitator passage and a replenishment opening for replenishing the toner to the second agitator passage.

REFERENCES:
patent: 4043293 (1977-08-01), Ruckdeschel
patent: 4266141 (1981-05-01), Hirakura et al.
patent: 4451135 (1984-05-01), Okumura
patent: 4550998 (1985-11-01), Nishikawa
patent: 4551002 (1985-11-01), Aoki et al.
patent: 4883019 (1989-11-01), Menjo et al.
patent: 4936249 (1990-06-01), Tajima et al.
patent: 4980727 (1990-12-01), Stelter

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