| 摘要 |
A hydraulic cylinder (100) driven by a reciprocating motive force operates in conjunction with two check valves (170 and 200) to pump liquid toner concentrate (150) around a loop from a reservoir bottle (180) and back into the bottle (180). A microprocessor circuit (230) analyzes commands and data bytes representative of the number and color of pixels transmitted from a computer (290) to an electrographic printer (280). When a predetermined pixel count has been reached, a microprocessor circuit (230), acting on positional information obtained from an optical sensor (240) and marks (250 and 260) on a wheel (160), causes a previously calculated volume of concentrate (150) to be added to a toner premix stream or reservoir in printer (280), thus replacing toner particles depleted from toner premix in the printer (280) during printing. The wheel (160) can run continuously to provide a stirring action for the concentrate (150).
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