PURPOSE: To enhance the working efficiency by automating the ink kneading work requiring heavy labor severely fatiguing an arm on a board.

CONSTITUTION: The high temp. roll 1 being in contact with an ink fountain slidably and the low temp. roll 10 being in contact with a doctor 23 slidably are parallelly provided so as to be rotated in a contact state or in a separate state. A hot water chamber 5 is provided in the high temp. roll 1 and a cold water chamber 20 is provided in the low temp. roll 10. The rotary shaft 11 of the low temp. roll 10 is supported by movable bearings 13 operated by pushing-up levers. An ink supply device wherein an ink storing tube is fixed on the high and low temp rolls and pressed by the tube compressing plate attached to the leading end of the squeezing lever sliding inwardly and outwardly from both sides of the tube to squeeze out ink is provided.