Patent ID: 7562870

Claim:
A printer comprising: a feed-in roller for feeding a sheet into a printing region; a feed-out roller for feeding the sheet out of the printing region; a rotation amount sensor for detecting a rotation amount of the feed-in roller; a DC motor for rotating the feed-in roller and the feed-out roller; and a controller for controlling the DC motor via a feedback loop based on the rotation amount of the feed-in roller detected by the rotation amount sensor so as to start intermittent sheet feed with a first line-feed-time that specifies a time period for one line feed of the sheet and vary the first line-feed-time to a second line-feed-time that is longer than the first line-feed-time before the sheet is fed by only the feed-out roller, wherein the controller controls the DC motor with first feedback parameters for the first line-feed-time and with second feedback parameters for the second line-feed-time, and wherein the first feedback parameters comprise a first gain, the second feedback parameters comprise a second gain, and the controller is configured to determine a deviation between a target rotation amount of the feed-in roller and the rotation amount of the feed-in roller detected by the rotation amount sensor, and to determine a target rotation rate of the feed-in roller by multiplying the deviation between the target rotation amount of the feed-in roller and the rotation amount of the feed-in roller detected by the rotation amount sensor by one of the first gain and the second gain.