Printer configured to set operation mode to one of first mode and second mode for appropriately determining whether to allow subsequent print control

A printer comprising:

• a printing head configured to perform printing on a medium;
• a platen roller configured to nip the medium in cooperation with the printing head;
• a cutter positioned downstream of the printing head and the platen roller in a conveying direction in which the medium is conveyed, the cutter being configured to cut the medium to provide a segmented medium;
• a discharge roller positioned downstream of the cutter in the conveying direction;
• a counter roller positioned to face the discharge roller and configured to nip the medium in cooperation with the discharge roller;
• a sensor positioned downstream of the discharge roller and the counter roller in the conveying direction, the sensor being configured to detect whether the segmented medium remains at a portion between the discharge roller and the counter roller;
• and
• a controller configured to perform:
• (a) acquiring information indicative of kind of the medium, the kind of medium being classified into either one of a first kind and a second kind;
• (b) setting, when the kind of the medium acquired in the (a) acquiring is the first kind, an operation mode to a first mode;
• (c) setting, when the kind of the medium acquired in the (a) acquiring is the second kind, the operation mode to a second mode;
• (d) controlling, when a first print instruction has been acquired, the printing head and the platen roller to perform printing on the medium based on the acquired first print instruction;
• (e) controlling, after completion of the (d) controlling, the cutter to cut the medium;
• (f) controlling the sensor to detect whether the segmented medium has been removed from the portion between the discharge roller and the counter roller;
• (g) permitting, when the sensor detects in the (f) controlling that the segmented medium has been removed from the portion between the discharge roller and the counter roller, a second print instruction to be received, the second print instruction being acquired subsequent to the first print instruction to perform printing on the medium;
• and
• (h) preventing, when the sensor detects in the (f) controlling that the segmented medium remains at the portion between the discharge roller and the counter roller, the second print instruction from being received, and
• wherein, when the operation mode is set to the first mode in the (b) setting, the controller performs:
• the (g) permitting when the sensor detects in the (f) controlling that the segmented medium has been removed from the portion between the discharge roller and the counter roller;
• and
• the (h) preventing when the sensor detects in the (f) controlling that the segmented medium remains at the portion between the discharge roller and the counter roller, and
• wherein, when the operation mode is set to the second mode in the (c) setting, the controller performs:
• (i) controlling the discharge roller to be rotated in the discharging direction;
• and
• the (g) permitting without executing the (f) controlling, the (g) permitting being performed after the (i) controlling is performed.