| 摘要 |
A method of printing utilises a printing apparatus (10) having a base (B), a printing station (9) where a print head (11) is mounted, the print head (11) including a plurality of printing elements (11 a ) which are selectively energisable to generate an image on a substrate (13) upon there being relative movement between the substrate (13) and the print head (11), the print head (11) being moveable relative to the base (B), and the apparatus (10) including a sensor device (33) to sense the speed of the substrate (13) as the substrate (13) moves relative to the base (B) adjacent to the printing station (9), and a controller (30) to receive input signals from the sensor device (33) and to control print head (11) movement relative to the base (B) to achieve a desired relative speed between the print head (11) and the substrate (13), and wherein the method includes predicting when the speed of the substrate (13) relative to the base (B), as the substrate (13) advances, will be less than a predetermined speed, and in response, moving the print head (11) at the printing station (9) to a downstream extreme position ( b ) of print head travel, and during printing of an image, moving the print head (11) from the downstream extreme position (b) towards the upstream extreme position ( a ). |
