filling the supply device automatically the device is arranged to follow the movements of the printing head along an adjacent recording medium a liquid filling member is adapted to transfer the liquid from the storing device to the supply device application_number US 53660774 A description an ink jet printer apparatus is shown in fig1 having a housing 10 provided with a printing head 11 a liquid reservoir 12 is shown that is preferably integral with the printing head the latter is adapted to move laterally relative to the paper 19 which is unwound from the supply roll 21 it should be observed that the liquid reservoir 12 has a fill opening 13 furthermore the liquid reservoir 12 communicates by means of channels 14 and 15 with the pump chambers located in the printing head the pump chambers house piezoelectric crystals 16 which cause the pumping action communicating with the output of the pumping chambers are channels 17 which extend into respective capillary nozzles through which ink droplets are propelled on to a printing medium for example a paper tape 19 passing between a press roller 22 and a rotary roller 20 the paper 19 then proceeds through paper guide 23 and is wound on the take up reel 24 the printing head 11 is fixed to a support 25 which in turn is slidably mounted on a shaft 26 it should be apparent that the printing head of the present device can be moved along the roller 20 between two end positions by a driving device not shown referring now to fig2 in which the reservoir 12 is shown together with an associated liquid filling device 27 the reservoir 12 is filled with a liquid absorbing material 28 which may comprise.