Printer

1 . 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;

a detection assembly configured to detect a position of the first guide and a position of the second guide, the detection assembly including:

a first sensor configured to detect whether the first guide is in a first position associated with the first sensor; and

a second sensor configured to detect whether the second guide is in a second position associated with the second sensor; and

a controller configured to acquire a first detection signal from the first sensor and a second detection signal from the second sensor and determine a width of the roll paper based on the first detection signal and the second detection signal.

2 . The printer of claim 1 , wherein the first sensor is offset from the second sensor in the width direction.

3 . The printer of claim 1 , wherein:

the detection assembly includes a third sensor configured to detect whether the first guide is in a third position associated with the third sensor; and

the controller is configured to acquire a third detection signal from the third sensor and determine the width of the roll paper based on the first detection signal, the second detection signal, and the third detection signal.

4 . The printer of claim 3 , wherein the controller is configured to:

determine that the roll paper has a first width in response to activation of the first sensor and the second sensor; and

determine that the roll paper has a second width different from the first width in response to activation of the third sensor and the second sensor.

5 . The printer of claim 3 , wherein:

the detection assembly includes a fourth sensor configured to detect whether the second guide is in a fourth position associated with the fourth sensor; and

the controller is configured to acquire a fourth detection signal from the fourth sensor and determine the width of the roll paper based on the first detection signal, the second detection signal, the third detection signal, and the fourth detection signal.

6 . The printer of claim 1 , wherein the controller is configured to:

determine, based on the first detection signal and the second detection signal, whether the roll paper is positioned closer to a first side of the housing or a second side of the housing in the width direction; and

in response to a determination that the roll paper is disposed closer to the first side, set an image forming range corresponding to the first side.

7 . The printer of claim 1 , wherein:

the first guide includes a protrusion; and

the first sensor is configured to provide the first detection signal in response to the first sensor receiving the protrusion.

8 . The printer of claim 1 , wherein the first guide includes a protrusion and the housing defines a groove that receives the protrusion to limit movement of the first guide.

9 . The printer of claim 1 , further comprising a printing head configured to form the image on the roll paper, wherein the controller is configured to vary operation of the printing head based on the determined width.

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

a housing;

a first guide movable laterally relative to the housing between a first position and a second position;

a second guide offset laterally from the first guide and movable laterally relative to the housing between a third position and a fourth position;

a first sensor configured to provide first sensor data related to a position of the first guide;

a second sensor configured to provide second sensor data related to a position of the second guide;

a third sensor configured to provide third sensor data indicating whether the first guide is in the first position; and

a controller configured to determine a distance between the first guide and the second guide based on the first sensor data, the second sensor data, and the third sensor data.

11 . The printer of claim 10 , further comprising a fourth sensor configured to provide fourth sensor data indicating whether the second guide is in the third position; and

the controller is configured to determine the distance between the first guide and the second guide based on the first sensor data, the second sensor data, the third sensor data, and the fourth sensor data.

12 . 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 first groove, a second groove, a third groove, and a fourth groove;

a first guide defining a first aperture and including a first protrusion;

a second guide defining a second aperture and including a second protrusion; and

a spindle extending through the first aperture and the second aperture and coupling the first guide and the second guide to the housing,

the first guide being movable along the spindle between a first position in which the first protrusion is received within the first groove and a second position in which the first protrusion is received within the second groove, and

the second guide being movable along the spindle between a third position in which the second protrusion is received within the third groove and a fourth position in which the second protrusion is received within the fourth groove.