Printer

A printer configured to form an image on roll paper, the printer comprising:

• a housing configured to house the roll paper;
• a first guide and a second guide coupled to the housing, the first guide and the second guide each being movable in a width direction of the roll paper, the first guide being separated from the second guide in the width direction to hold the roll paper therebetween, and the first guide including a protrusion;
• a detection assembly configured to detect a position of the first guide and a position of the second guide, the detection assembly including a sensor configured to provide a detection signal in response to the sensor receiving the protrusion;
• and
• a controller configured to determine a width of the roll paper based on the detection signal.

A printer configured to form an image on roll paper, the printer comprising:

• a housing configured to house the roll paper, the housing defining a groove;
• a first guide and a second guide coupled to the housing, the first guide and the second guide each being movable in a width direction of the roll paper, the first guide being separated from the second guide in the width direction to hold the roll paper therebetween, wherein the first guide includes a protrusion that is received within the groove of the housing to limit movement of the first guide;
• a detection assembly configured to detect a position of the first guide and a position of the second guide;
• and
• a controller configured to determine a width of the roll paper based on a detection result of the detection assembly.