Patent ID: 8191978

Claim:
An image former comprising: an ink route configured for circulation of ink; a sheet transfer system configured for transfer of sheets; an inkjet head configured to use ink received from the ink route to form images on a sheet in the sheet transfer system; a temperature measuring element configured to measure a temperature of ink received from the ink route; and a controller configured for control of temperatures of ink in the ink route and control of actions of the sheet transfer system and the inkjet head, the controller being adapted to work with a measure of temperature of ink at the temperature measuring element within a first temperature range, to implement a first control process of having the inkjet head propel out droplets of ink at a first discharge speed for formation of images; and with a measure of temperature of ink at the temperature measuring element within a second temperature range lower than the first temperature range, to implement a second control process of having the inkjet head propel out droplets of ink at a second discharge speed greater than the first discharge speed for formation of images, wherein the controller is adapted to determine that end regions of a frame of images to be formed in regions at transfer-longitudinal ends of a sheet to be transferred in the sheet transfer system have a print ratio within a prescribed range, to execute formation of images.