摘要:
To allow printing of a sheet of paper large in size without increasing the entire apparatus length and high precision and high speed printing, a sheet-fed duplex printer comprises a pair of impression cylinders (6a,6b) each provided on a peripheral surface thereof with a paper gripper for gripping a sheet of paper, one of the impression cylinders in rotational contact with the other impression cylinder disposed downstream in a direction of rotation of and obliquely below the one impression cylinder. The two impression cylinders are synchronously rotated so that the regions of rotational contact thereof both move downwards. The sheet of paper reversing its printing face when the sheet of paper conveyed following a peripheral surface of the one impression cylinder is conveyed to follow that of the other impression cylinder. A first electrophotographic printing unit (7a) is disposed opposite to a peripheral surface area of the one impression cylinder which area is upstream in the direction of rotation of the one impression cylinder from the region of rotational contact (B) between the one and the other impression cylinder for printing on one face of the sheet of paper being conveyed following the peripheral surface of the one impression cylinder. A second electrophotographic printing unit (7b) is disposed opposite to a peripheral surface area of the other impression cylinder which area is downstream in the direction of rotation of the other impression cylinder from the region of rotational contact between the one and the other impression cylinder for printing on the other face of the sheet of paper being conveyed following the peripheral surface of the other impression cylinder.
摘要:
To allow shortening the horizontal length for sheet-fed duplex printing while preventing a printing face of the sheet of paper printed on upstream in its conveyance direction from becoming soiled by toner transferred from a printing face of sheet of paper printed on downstream in its conveyance direction, a sheet-fed duplex printer comprises a pair of impression cylinders 6a, 6b each provided on a peripheral surface thereof with a paper gripper for gripping a sheet of paper, one of the impression cylinders in rotational contact with the other impression cylinder disposed downstream in a direction of rotation of and obliquely below the one impression cylinder. The two impression cylinders are synchronously rotated so that the regions of rotational contact thereof both move downwards. The sheet of paper reversing its printing face when the sheet of paper conveyed following a peripheral surface of the one impression cylinder is conveyed to follow that of the other impression cylinder. A first electrophotographic printing unit 7a is disposed opposite to a peripheral surface area of the one impression cylinder which area is upstream in the direction of rotation of the one impression cylinder from the region of rotational contact between the one and the other impression cylinder for printing on one face of the sheet of paper being conveyed following the peripheral surface of the one impression cylinder. A second electrophotographic printing unit 7b is disposed opposite to a peripheral surface area of the other impression cylinder which area is downstream in the direction of rotation of the other impression cylinder from the region of rotational contact between the one and the other impression cylinder for printing on the other face of the sheet of paper being conveyed following the peripheral surface of the other impression cylinder. And, a cleaning unit 23 for impression cylinder is disposed opposite to, and adapted to clean, a peripheral surface area of the other impression cylinder, the peripheral surface area of the other impression cylinder being downstream in the direction of its rotation from a position thereon at which the sheet of paper conveyed following the surface of the other -impression cylinder is transferred therefrom downstream in the direction of conveyance of the sheet of paper.
摘要:
Provided are a transfer roller cleaning apparatus (20) that has a supply roller (22) that is immersed in the carrier liquid in a carrier liquid vessel (30); a cleaning roller (21) that is rubbed and rotated on the supply roller and the transfer roller, and supplies the carrier liquid received from the supply roller to a surface of the transfer roller; and a carrier liquid circulation device which includes the carrier liquid vessel, supplies the carrier liquid in a storage tank to the carrier liquid vessel using a pump, and sends the carrier liquid overflowed from the carrier liquid vessel back to the storage tank via an overflow liquid recovery path (45), so as to constitute a carrier liquid circulation path and an electronic photograph printer (10) configured by providing the same.
摘要:
It is made possible to non-mechanically adjust and eliminate a mutual deviation between images printed by a plurality of printing units in a digital sheet-fed printing machine using a plurality of transport cylinders. A digital sheet-fed printing method is disclosed which comprises: providing one cycle of printing to print on a series of sheets of paper whose number is equal to the least common multiple of respective numbers of allocated positions on adjacent ones of the transport cylinders; for each sheet of paper in the series to be printed in the one cycle of printing, producing a reference signal on the basis of which an image in each color is printed on the sheet of paper with each printing unit, timed to its passage through the printing unit, under control by a printing control means; in a first of such cycles of printing, detecting with an image detection sensor means a mutual out of register between images in different colors printed on each sheet of paper in the series, furnishing the printing control means with a detection signal for each sheet of paper from the image detection sensor means, and correcting the timing at which each image is printed on each sheet of paper in one cycle of printing by the printing control means and on the basis of such detection signals so that timings to print the images in different colors on each sheet of paper may be coincided with one another; and in each subsequent printing cycle, printing images in the different colors on each sheet of paper at a printing timing as corrected as aforesaid.
摘要:
[Problem to be Solved] To provide an inkjet recording apparatus capable of adjusting the number of colors and capable of efficiently performing recording continuously on both surfaces of a web and an inkjet recording method using the same. [Solution] The present invention is directed to an inkjet recording apparatus 100 capable of performing recording continuously on both surfaces of a web 1, including a plurality of recording heads H1 to H8 disposed on a substrate, driers 5a and 5b for drying the web 1 recorded by the recording heads H1 to H8, and guide rollers A1 to A8, B1 to B8, and G1 to G8 for guiding the web 1, in which a traveling path of the web 1 is switchable so that the web 1 passes between any selected adjacent ones of the recording heads H1 to H8, the recording head upstream of the position where the web passes performs recording on one surface 1a of the web 1, and the recording head downstream of the position where the web 1 passes performs recording on the other surface 1b of the web 1, and an inkjet recording method using the same.
摘要:
To allows printing of a sheet of paper large in size without increasing the entire apparatus length and high precision and high speed printing, a sheet-fed duplex printer comprises a pair of impression cylinders 6a, 6b each provided on a peripheral surface thereof with a paper gripper for gripping a sheet of paper, one of the impression cylinders in rotational contact with the other impression cylinder disposed downstream in a direction of rotation of and obliquely below the one impression cylinder. The two impression cylinders are synchronously rotated so that the regions of rotational contact thereof both move downwards. The sheet of paper reversing its printing face when the sheet of paper conveyed following a peripheral surface of the one impression cylinder is conveyed to follow that of the other impression cylinder. A first electrophotographic printing unit 7a is disposed opposite to a peripheral surface area of the one impression cylinder which area is upstream in the direction of rotation of the one impression cylinder from the region of rotational contact between the one and the other impression cylinder for printing on one face of the sheet of paper being conveyed following the peripheral surface of the one impression cylinder. A second electrophotographic printing unit 7b is disposed opposite to a peripheral surface area of the other impression cylinder which area is downstream in the direction of rotation of the other impression cylinder from the region of rotational contact between the one and the other impression cylinder for printing on the other face of the sheet of paper being conveyed following the peripheral surface of the other impression cylinder.
摘要:
A rotary press is provided that prevents a print from contamination with a color different from a printing color. The rotary press comprising a printing unit (11) made of a set of printing cylinders such as plate and blanket cylinders or plate and impression cylinders for printing paper; and a dryer (14) disposed downstream of the printing unit for drying the paper printed, has a guide roller (19a,19b,19c) included therein for guiding the printed paper from the printing unit into the dryer wherein the guide roller has a diameter which is equal to, or a an integral multiple of, a diameter of a printing cylinder in the printing unit and is adapted to rotate synchronously with the printing cylinder and at a peripheral speed that is identical to that at which the printing cylinder is rotated.