Screen Holdings Co., Ltd.

Shogo Muto

Yasunori Akiyoshi

Kazuhiko Asada

Koji Kanki

Closing the replenishing solenoid valve Vland opening the return solenoid valve Vlprohibits passage of the ink fed using the replenishing pumpthrough the replenishing solenoid valve Vland allows this ink to pass through the return solenoid valve Vl. In this way, the ink is circulated along the circulation path Cc(second circulation path) along which the ink is fed from the buffer tankto the branch point J though the replenishing pipeand then fed from the branch point J to the buffer tankthrough the return pipe

Printing apparatus and ink feeding method in printing apparatus

The ratio of the rotation speed Nr of the take-up roller (take-up rotation speed) and the rotation speed Nu of the feeding roller (feeding rotation speed) is used. That is, knowledge that the roll diameter Drr of the sheet S taken up on the take-up roller is given by a function using the ratio of the rotation speeds Nr and Nu as a variable was obtained. Accordingly, the roll diameter Drr is computed from this ratio.

Cleaning unit, printing apparatus and roll diameter acquisition method

The cleaning liquid is supplied to the head facing flat surface, and the dummy flat surface of the dummy block facing the head facing flat surface contacts the cleaning liquid. This causes the cleaning liquid to be spread on the head facing flat surface by the dummy flat surface. The cleaning liquid spread on the head facing flat surface is sucked through the suction holes of the suction block. The suction holes can be cleaned by the cleaning liquid passing through the suction holes according to suction. On this occasion, the ink supplied to the head facing flat surface is removed through the suction holes of the suction block. The suction holes have both a function of removing the ink from the discharge heads H and a function of removing the cleaning liquid from the head facing flat surface.

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Kyoto, Japan

Shogo Muto