Patent ID: 8857932
Filing Date: 2014-10-14
Classification: B41J

Abstract:
1. An image forming apparatus comprising: a print head to discharge liquid droplets; a head tank to contain a liquid to be supplied to the print head; a carriage mounting the print head and the head tank thereon; a main tank to contain a liquid to be supplied to the head tank; a pump to convey the liquid from the main tank to the head tank; a displaceable member disposed on the head tank and displacing in response to an amount of the liquid remaining inside the head tank; a first sensor disposed at the carriage and detecting the displaceable member at a predetermined first position; a second sensor disposed outside the carriage at the apparatus and detecting the displaceable member at a predetermined second position different from the first position, the first position being a position in which the amount of the liquid remaining in the head tank is less than at the second position; a controller to detect and store a displacement difference amount corresponding to a displacement amount of the displaceable member between the position detected by the first sensor and the position detected by the second sensor and to supply an amount of liquid corresponding to the displacement difference amount to the head tank from the main tank, when the liquid is supplied from the main tank to the head tank without using the second sensor after the first sensor detects the displaceable member; and an environmental condition detector to detect an environmental condition in which the apparatus is disposed, the controller being configured to: