Corrugated paperboard printer and corrugated paperboard box making machine

A corrugated paperboard printer comprising:

• a chamber which reserves ink;
• an anilox roll onto which the ink is transferred from the chamber;
• a printing roll provided with a printing plate, the printing roll being configured to allow the ink to be transferred from the anilox roll onto the printing plate, and transfer the ink on the printing plate onto a corrugated paperboard sheet to print the corrugated paperboard sheet;
• an ink carrier pipe configured to carry ink between an ink supply source and the chamber;
• and
• a switching valve configured to switch a flow rate of ink flowing through the ink carrier pipe;
• wherein the chamber comprises:
• a chamber frame comprising an ink reservoir which reserves the ink;
• a doctor blade attached to the chamber frame and configured to scrape the ink transferred onto the anilox roll to adjust a thickness of the ink after the transfer;
• and
• a steel member disposed on an opposite side of the anilox roll across the chamber frame;
• and
• wherein:
• the ink carrier pipe is disposed on an opposite side of the anilox roll across the chamber frame and communicated with the ink reservoir of the chamber frame;
• and
• the steel member comprises a web extending in an up-down direction of the chamber, a first flange extending in a conveyance direction of the corrugated paperboard sheet, and a second flange extending in the conveyance direction, wherein:
• an up-down directional upper end of the web is connected to a conveyance directional intermediate portion of the first flange;
• an up-down directional lower end of the web is connected to a conveyance directional intermediate portion of the second flange;
• the web is penetratingly formed with an maintenance opening in accordance with a position of the switching valve;
• and
• the second flange is formed with an insertion part for allowing the ink carrier pipe to be inserted therein.