Printer

A printer comprising:

• a feeder configured to feed an elongated medium fed out from a roll with the elongated medium wound around an axis, the elongated medium being consumed during printing,
• a pulse motor configured to drive said feeder,
• a drive control device configured to output a pulse signal for driving said pulse motor,
• an object to be detected that is configured to rotate in conjunction with a rotation of said roll and includes M detection pieces provided along a circumferential direction, the M being an integer of two or more,
• an optical detection device configured to optically detect said detection pieces of said object to be detected,
• a display device configured to perform a desired display,
• a processor, and
• a memory,
• the memory storing computer-executable instructions that, when executed by processor, cause the printer to perform:
• a remaining amount determining process, and
• an index value detecting process,
• in said index value detecting process, in accordance with feeding of said elongated medium by said feeder driven by said pulse motor, pulse count index values each represented by the number of pulses of said pulse signal per each of said detection pieces being sequentially detected for said respective detection pieces,
• in said remaining amount determining process, first process, second process, third process, and fourth process being sequentially executed with N increased by one at a time in accordance with consumption of said elongated medium,
• in the first process, an Nth determination object value defined as a determination object being calculated from both an Nth pulse count index value after a start of feeding and an N+1th pulse count index value adjacent to the Nth pulse count index, among a plurality of said pulse count index values sequentially detected in said index value detecting process, N being an integer of one or more,
• in the second process, an average value being calculated from a plurality of successive pulse count index values in a predetermined range including a latest value that is an Nth pulse count index value when N is an even number or is an (N−1)th pulse count index value when N is an odd number of three or more, among a plurality of said pulse count index values sequentially detected in said index value detecting process,
• in the third process, out of remaining amount ranks preset in multiple stages from a long remaining amount side to a short remaining amount side, said remaining amount rank corresponding to said Nth determination object value being determined based on said average value calculated in said second process by using a predetermined correlation obtained in advance between a remaining amount of said elongated medium in said roll and said pulse count index value,
• in the fourth process, a rank display corresponding to said remaining amount rank determined in said third process being performed on said displaying device.