Komori Corporation

Konica Minolta, Inc.

Hiroyuki Suda

Satoshi Murakami

Hayato Kondo

Masaharu Ito

Yasuhiro Suzuki

Kazuya Takahagi

Atsushi Saita

Yuji Ishizuka

Toyoaki Sugaya

Hirotaka Kiyota

Mitsuru Obata

Toshinori Kubo

A printing apparatus includes a printing cylinder () that holds and transfers a sheet (), a supply-side transfer cylinder ((sheet supply unit)) that supplies the sheet () to the printing cylinder () at a supply position (P), and first to fourth inkjet heads (-). The printing apparatus includes a transfer mechanism () that receives the sheet () after printing at a receiving position (P) and transfers the sheet () to one of a discharge route () and a reversing route (). The reversing route () employs an arrangement that returns the reversed sheet () to the printing cylinder () at a return position (P) located on the downstream side of the receiving position (P) in the transfer direction of the sheet () and on the upstream side of the supply position (P) in the transfer direction of the sheet (). A cooling means () for cooling the transfer surface ((outer peripheral surface)) of the printing cylinder () is provided between the receiving position (P) and the return position (P). It is possible to provide the printing apparatus that suppresses an increase in the temperature of the transfer surface of the printing cylinder and always sets the temperature of the sheet at an appropriate temperature.

Printing apparatus

A printing press includes a printing cylinder, inkjet heads, and an ink drying lamp. A non-metal sheet is attached to an outer surface of the printing cylinder. The non-metal sheet includes a main body made of a non-metal material in a sheet-like shape, and a plurality of ventilation portions through which air passes in a thickness direction of the main body. This makes it possible to efficiently dissipate heat of the printing cylinder while preventing the printing cylinder from being overheated when an amount of heat generated at the time of printing is transferred to the surface of the printing cylinder.

Printing press

A printing cylinder includes a plurality of suction chambers and a masking sheet configured to cover the suction chambers. The masking sheet includes a non-sucking portion which protrudes from the boundary of the suction chambers toward the inside of the suction chambers. A number of through holes are formed in a portion except for the non-sucking portion in the masking sheet. The non-sucking portion exists between the sheet to be printed and the boundary of the suction chamber to be used and the suction chamber not to be used. This can prevent an ink mist from adhering to the printing cylinder.

A digital printing apparatus including a sheet supply device, printing cylinder, inkjet nozzle portion, sheet delivery device, and conveyance devices. The sheet supply device supplies sheets one by one at a predetermined period. The printing cylinder includes at least one gripper device that grips and holds the sheet, and conveys the sheet while one edge of the sheet supplied from the sheet supply device is held by the plurality of gripper devices. The inkjet nozzle portion discharges ink droplets onto the sheet. The conveyance devices include a plurality of gripper devices including one reversing gripper device that grips and holds the other edge of the sheet, and conveys the sheet printed on one surface, which is received from the printing cylinder in a double-sided printing mode. The sheet is turned by reversing the obverse/reverse surface of the sheet by the reversing gripper device in the process of conveyance.

Digital printing apparatus

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.

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Yamagata, Japan

Hiroyuki Suda