for the same materials and constituent parts having the same functions and redundant descriptions thereof are omitted exemplary embodiments of the present disclosure are now described below with reference to the accompanying drawings it should be noted that in a later described comparative example exemplary embodiment and alternative example the same reference numerals are used for the same constituent elements such as parts and materials having the same functions and redundant descriptions thereof are omitted fig1 is a schematic view illustrating a general configuration of maintenance and recovery mechanisms used in image forming apparatuses according to exemplary embodiments of the present invention for a maintenance and recovery mechanism 10 illustrated in fig1 when viscosity increased ink or bubbles appear in a recording head 11 the recording head 11 may become unable to discharge ink normally hence a nozzle formation face of the recording head 11 is sealed with a cap 12 and such viscosity increased ink or bubbles are suctioned from a drain tube 13 communicating with the cap 12 by using a suction device for example a pump 15 driven by a motor 14 serving as a drive source the viscosity increased ink or bubbles suctioned by the pump 15 are drained to a drain reservoir 16 thus maintaining the recording head 11 in a normal state however when a highly viscous ink for example a pigmented ink is used such a highly viscous ink may accumulate in a solid state in the drain reservoir 16 particularly in a low humidity environment such solid accumulation may occur due to air drying hence image forming apparatuses according to exemplary embodiments of the present invention are configured as follows fig2 a to 2c are.