Ink-jet printer which securely holds a printing medium without c

Details Ink-jet printer which securely holds a printing medium without c Ink-jet printer which securely holds a printing medium without c

1998-01-22

2000-06-13

Lee, Susan S. Y.

Incremental printing of symbolic information

Ink jet

Medium and processing means

B41J 1302, B41J 1310, B41J 201

Patent

active

060740566

ABSTRACT:
An ink-jet printer includes a rotary drum having a peripheral surface with a plurality of suction holes arranged therein for rotating at a constant speed, a sheet loader for loading a paper sheet to the peripheral surface of the rotary drum, a sheet holding system for holding the paper sheet on the peripheral surface of the rotary drum by applying negative suction pressure to the paper sheet via the suction holes, and a print head for printing an image by jetting ink onto the paper sheet. The rotary drum has an outer cylindrical member which serves as the peripheral surface, an inner cylindrical member having a diameter smaller than the outer cylindrical member, and a partitioning wall for fixing the inner cylindrical member in the outer cylindrical member at a uniform distance from the outer cylindrical member and for partitioning the space between the inner cylindrical member and the outer cylindrical member into a plurality of air rooms in a drum rotational direction. The sheet holding system includes a plurality of suction air holes which are arranged in the inner cylindrical member to associate with the air rooms, a suction unit for suctioning air via the suction air holes to set the air rooms in a negative pressure state, and an air-flow control mechanism for sequentially setting the suction air holes from a closed state to an open state as the suction holes pass a loading position of the paper sheet by rotation of the rotary drum.

REFERENCES:
patent: 4101018 (1978-07-01), Sokolowski
patent: 4157178 (1979-06-01), Ollendick
patent: 5376954 (1994-12-01), Kerr
patent: 5711223 (1998-01-01), Taylor

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