Patent ID: 8926076
Filing Date: 2015-01-06
Classification: B41J

Abstract:
1. An image forming apparatus comprising: a recording head to discharge liquid droplets; a sub-tank to contain liquid to be supplied to the recording head; a carriage to carry the head and the sub-tank; a main tank to contain the liquid to be supplied to the sub-tank; and a liquid feeder to supply the liquid from the main tank to the sub-tank, wherein the sub-tank has a displacement member that changes its position according to a remaining amount of the liquid in the sub-tank, a first detector to detect that the displacement member is at a predetermined first position is provided to the carriage, a second detector to detect that the displacement member is at a predetermined second position is provided to a body of the image forming apparatus, the remaining amount of the liquid in the sub-tank when the displacement member is at the first position is smaller than the remaining amount of the liquid in the sub-tank when the displacement member is at the second position, a differential supply amount corresponding to a displacement amount of the displacement member between the position at which the displacement member is detected by the first detector and the position at which the displacement member is detected by the second detector is detected and stored, and the liquid feeder supplies the liquid to the sub-tank, in the differential supply amount, after the first detector detects the displacement member when the liquid is supplied to the sub-tank from the main tank without using the second detector.