Abstract: The present invention is directed to an ink jet system printer comprises a carriage carrying a nozzle for discharging ink droplets towards a recording medium in response to an ink supply device, deflection means for selectively deflecting the ink droplets for recording purposes, and a beam gutter for collecting an amount of the ink droplets which are not contributive to the recording purposes. A pump means is connected to the beam gutter for feeding the amount of the ink droplets back to the ink supply device. In a specific form of the present invention, the pump is combined with a ink supply pump for supplying the nozzle with ink, the ink supply pump being part of the ink supply device.

Abstract: An ink liquid supply system for an ink jet system printer comprising an ink liquid reservoir for containing ink liquid therein, and a constant flow rate pump for supplying the ink liquid to a nozzle. The constant flow rate pump comprises a first chamber for introducing an ink liquid collected by a beam gutter of the ink jet system printer and for returning the ink liquid to the ink liquid reservoir. The constant flow rate pump further comprises a second chamber for introducing the ink liquid from the ink liquid reservoir and for developing the ink liquid to the nozzle. The first and second chambers include a coaxial piston disposed therein for varying the pressure created in the first and second chambers.

Abstract: The present invention is directed to an ink supply device for use in an ink jet printer having a constant flow rate pump for ink supply. Preferably, the ink supply pressure at an ink ejection nozzle is sensed and as a result of this ink and an ink solvent are alternatively fed, thus supplying ink of a fixed viscosity to the ink ejection nozzle.

Abstract: A card retrieval system in which each card is provided at its one peripheral edge with a magnetic strip which includes a unique notch structure for the purpose of retrieving individual cards. A plurality of selector bars are positioned in a manner to meet at right angles to a stack of the cards, while a magnet is positioned against the magnetic strips of the stacked cards. By the attracting force of the magnet, a specific card is slightly drawn out from the card stack in cooperation with the selector bars and the notch structure. Subsequent to this, locking members are operative to preclude the drawing out of the other cards and the plurality of the selector bars are withdrawn over the retrieved card transportation course. In this manner, the retrieval of a specific card is accomplished by the magnet.