MEDIA CONVEYANCE CONTROL METHOD AND PRINTER

摘要

A printer 1 has a movable member 27 that can move following change in the tension on recording paper 3 between a roll paper compartment 7 and a conveyance mechanism 12 on the paper conveyance path 8. When recording paper 3 of which the end is glued to the core 2a of a paper roll 2 runs out, the tension on the recording paper 3 rises and the movable member 27 goes to a tension-side error determination range E1 in its range of allowable movement E0. When the movable member 27 is in the tension-side error determination range E1, the time the movable member 27 remains in the tension-side error determination range E1 is counted, and if this measured time exceeds an error determination time, an error detection unit 38 detects an error. No-paper errors can therefore be detected without using a dedicated sensor.

主权项

1. A media conveyance control method of a media conveyance device having a conveyance mechanism that conveys a continuous medium delivered from a roll, and a media supply motor that rotates the roll, comprising:
positioning a movable member that moves in response to a change in the tension on the medium between the roll and the conveyance mechanism; setting a target position and an error determination range separated from the target position in the movable range of the movable member; acquiring a positional deviation of the movable member from the target position continuously or intermittently while conveying the medium by the conveyance mechanism; controlling driving the media supply motor based on the positional deviation to set the movable member to the target position; measuring the time the movable member remains in the error determination range after the movable member enters the error determination range; and determining if an error occurred based on the measured time.