Abstract: A printing device improves the conveyance precision when printing on a print medium that changes the conveyance load. A printing device has a main feed roller 33 driven by a main feed motor 43 to convey a print medium P with a variable conveyance load, a print unit 13 that prints on the print medium P conveyed by the main feed roller 33, a current detector 66 that detects change in the current supplied to the supply motor 41 according to variation in the conveyance load, and a control unit 14 that controls driving the main feed motor 43. The control unit 14 changes a control parameter of the main feed motor 43 according to change in the current to maintain a target conveyance precision of the print medium P.

Abstract: A control method of a serial printer enables easily removing the printing paper when a paper jam occurs, and can prevent or suppress damage to the printhead when removing the printing paper. A serial printer 1 conveys printing paper P by a conveyance mechanism 22 including a second paper feed roller pair 31 located upstream from the print position A in the first conveyance direction M1. If a paper jam of the printing paper P is detected when the printhead 12 is at a position opposite the horizontal conveyance path portion 13c of the paper conveyance path 13, conveyance of the printing paper P first stops, and the printhead 12 is then moved on the vertical axis Z away from the horizontal conveyance path portion 13c. Next, the printhead 12 is moved on the transverse axis X to a away position 12AW outside the horizontal conveyance path portion 13c, and nipping of the printing paper P by the second paper feed roller pair 31 is then released.

Abstract: A control method of a serial printer enables easily removing the printing paper when a paper jam occurs, and can prevent or suppress damage to the printhead when removing the printing paper. A serial printer 1 conveys printing paper P by a conveyance mechanism 22 including a second paper feed roller pair 31 located upstream from the print position A in the first conveyance direction M1. If a paper jam of the printing paper P is detected when the printhead 12 is at a position opposite the horizontal conveyance path portion 13c of the paper conveyance path 13, conveyance of the printing paper P first stops, and the printhead 12 is then moved on the vertical axis Z away from the horizontal conveyance path portion 13c. Next, the printhead 12 is moved on the transverse axis X to a away position 12AW outside the horizontal conveyance path portion 13c, and nipping of the printing paper P by the second paper feed roller pair 31 is then released.

Abstract: An inkjet line printer has a first encoder for detecting the media conveyance distance of the paper feed roller, and a second encoder for generating a signal to control the ink ejection timing. The encoder scales of the first encoder and second encoder are disposed to the intermediate roller of a speed reducing mechanism that transfers drive power from the paper feed motor to the paper feed roller. Because the second encoder outputs a pulse signal with a predetermined number of pulses in the time the recording paper is conveyed a specific distance by the paper feed roller, the signal from the second encoder can be used as a signal to control the timing of ink ejection from the inkjet head.