Patent
1990-06-15
1991-05-14
Mathews, A. A.
354317, 354324, G03D 506, G03D 500
Patent
active
050160362
ABSTRACT:
A developing device of such liquid developer circulating type that introduces the liquid developer into a developing head by the action of negative pressure suction force created by a suction pump to develop a latent image on a recording medium by the liquid developer thus introduced, characterized by a means for adjusting and controlling the pumping capacity of the suction pump, responsive to a control command which represents a predetermined sequence and condition of the liquid developer circulated. It is preferable to add to the device a means for adjusting and controlling the pumping capacity of the suction pump, responsive to a control command obtained relating to a surface roughness of the recording medium, a means including a timer circuit for controlling the suction pump to operate with high pumping capacity for a predetermined time period after the operation of the pump is started, and then with low pumping capacity, and a means for adjusting and controlling the pumping capacity of the suction pump, responsive to a detection signal sent from a sensor which serves to detect a condition of the liquid developer flowing through the developing head.
REFERENCES:
patent: 4623236 (1986-11-01), Stella
patent: 4634252 (1987-01-01), Jeremijevic
patent: 4947199 (1990-08-01), Tsunekawa
Mathews A. A.
Olympus Optical Co,. Ltd.
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