Konica Minolta, Inc.

Komori Corporation

Mitsuru Obata

Shinya Takahashi

Hiroyuki Tokimatsu

Toshiyuki Mizutani

Toyoaki Sugaya

Akio Maeda

Satoshi Murakami

Takashi Muramatsu

Hiroyuki Suda

Masakazu Date

Hiroya Kimoto

An inkjet printing apparatus includes an ink tank, a print head, an ink flow passage, a degassing device, a circulation flow passage and a circulation pump. The print head discharges ink supplied from the ink tank through the ink flow passage. The degassing device is disposed midway in the ink flow passage and removes air from the ink. The circulation flow passage has two ends respectively connected to two sides of the degassing device. The circulation pump is disposed midway in the circulation flow passage and returns the ink flowing out of the degassing device to a position to flow in the degassing device. The ink flow passage between an outflow port from the circulation flow passage and an inflow port thereto and the circulation flow passage are formed such that the ink is movable at approximately a constant speed.

Inkjet printing apparatus

Inkjet recording apparatus includes recording headhaving a plurality of nozzles N, first ink storage section, supply passageconnecting recording headand section, electromagnetic valvethat opens or closes section, second ink storage section, pump Pthat supplies the ink in sectionto section, an electromagnetic valvethat opens or closes the second storage ink section, recovery passagethat connects the recording headand the second storage section, and electromagnetic valvesandwhich open or close the recovery passage. Control unitallows ink inside the recording headto reflow to the second ink storage sectionby operating the pump Pin a state in which the electromagnetic valvesandare closed and the electromagnetic valveis opened.

Inkjet recording apparatus and recording head maintenance method

In order to perform recording head maintenance by discharge and reflux of ink with higher pressures without creating instability of the meniscus in the nozzle surface, this image forming device may be provided with a recording head having multiple nozzles, a first reservoir unit and a second reservoir unit which store the ink supplied to the recording head, a supply unit which is opened and closed by a solenoid valve and connects the recording head and the first reservoir unit, a pump which supplies the ink in the second reservoir unit to the first reservoir unit, a recovery passage which is opened and closed by solenoid valves and connects the recording head and the second reservoir unit, and a control unit which controls operation of the solenoid valves and the pump.

Image forming device and recording head maintenance method

Image formation device having: an image formation drum () for rotationally conveying a recording medium while holding the recording medium; a supply means () for supplying the recording medium (P) to the drum; a recording head () for forming an image on the recording medium on the drum; and a conveyance mechanism () for receiving the recording medium from the drum at a reception position (m2) on the downstream side in a conveyance direction from the recording head and distributing the recording medium to a paper discharge path or an inversion path. The conveyance mechanism returns the recording medium to the drum at a return position (m9) on the downstream side in the conveyance direction from the reception position (m2) after the front and back surfaces thereof are inverted, and a drum heating means () for heating the surface drum is provided between the reception position and the return position.

Image formation device

An inkjet recording device includes an image forming drum, a recording medium supplying section, a recording head which ejects ink onto a recording medium, a first heating unit which heats the recording medium held on the drum before image recording, a second heating unit which heats the drum downstream of the position at which the recording medium is outputted after image recording and upstream of the supplying section, a heating-unit temperature detector, a drum temperature detector, and a heating control section. The heating control section performs heat control of the first heating unit such that the temperature detected by the heating-unit temperature detector falls within a predetermined set temperature range, and performs heat control of the second heating unit such that the temperature detected by the drum temperature detector falls within a predetermined set temperature range.

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Sagamihara, Japan

Mitsuru Obata