Patent ID: 8672567

Claim:
A printer apparatus supplying a recording medium that is in a rolled state, from a recording medium accommodating unit accommodating the recording medium to a printing unit, to execute printing, the printer apparatus comprising: a recording medium holding unit that holds the recording medium and is formed in the recording medium accommodating unit; a detecting unit that detects that a core part in a center portion of the recording medium has reached a predetermined position accompanying consumption of the recording medium held in the recording medium holding unit; and a user switch lever that selectively moves the detecting unit between a position that activates the detecting unit and a position that deactivates the detecting unit; wherein the detecting unit comprises a protrusion that biases and abuts a side surface of the recording medium, and detects entry of the protrusion into a space of the core part in the center portion of the recording medium by a movement of the core part; and the printer apparatus further comprising a retracting rib configured to prevent the protrusion from swinging when the detecting unit is in the position that deactivates the detecting function.