Printer

A printer comprising:

• a feeder configured to transport an elongated medium that is to be consumed during printing fed out from a roll that includes an outer periphery around which said elongated medium is wound;
• a pulse motor configured to drive said feeder;
• a drive control device configured to output a pulse signal for driving said pulse motor;
• a body to be detected that is configured to rotate in conjunction with rotation of said roll, and includes M (M is an integer greater than or equal to 2) detected elements along a circumferential direction;
• an optical detection device configured to optically detect said detected elements of said body to be detected;
• a processor;
• and
• a memory,
• said memory storing computer-executable instructions that, when executed by said processor, cause said printer to perform:
• a comparison value calculation step;
• an index value detection step;
• and
• a first determination step,
• said index value detection step including:
• detecting a pulse count index value expressed by a pulse count of said pulse signal per one of said detected elements, in sequence for each of said detected elements, in accordance with transport of said elongated medium by said feeder driven by said pulse motor,
• said comparison value calculation step including:
• a first process for calculating an N-th determination target value to be determined, from an N-th (N:
• an integer greater than or equal to 1) pulse count index value from start of transport and an (N+1)th pulse count index value adjoining the N-th pulse count index value, among a plurality of said pulse count index values detected in sequence at said index value detection step;
• a second process for calculating a mean value of a plurality of consecutive pulse count index values within a predetermined range with its latest value being an (N−1)th pulse count index value when N is an odd number greater than or equal to 3 or an (N−2)th pulse count index value when N is an even number greater than or equal to 4, among the plurality of said pulse count index values detected in sequence at said index value detection step;
• and
• a third process for calculating a comparison value by comparing, with using a predetermined arithmetic operation, (N−1)th said determination target value among said determination target values calculated in sequence in said first process with said mean value calculated in said second process,
• said first process to said third process being performed in sequence while increasing N one by one with consumption of said elongated medium,
• said first determination step including determining whether said elongated medium wound around the outer periphery of said roll has reached a consumption completion status or not, on the basis of a magnitude relation between said comparison value calculated at said comparison value calculation step and a predetermined first threshold value.