A media processing device includes: a body defining a media supply chamber and carrying a print head; a cover carrying a platen roller, the cover having an open position enabling access to the chamber, and a closed position enclosing the chamber, and cooperating with the body to define a media path extending from the chamber, between the print head and the platen roller, to a media outlet; a target conductor affixed to one of the body and the cover; and an inductive proximity sensor affixed to the other of the body and the cover, disposed to detect the target conductor when the cover is closed.

A receipt printer comprises a discharge port configured to discharge a receipt; a conveyance section configured to convey a paper; a clamping section configured to clamp the paper in the front of the discharge port; and a controller configured to control the conveyance section to discharge the paper from the discharge port. The clamping section includes a fixed section and a movable section forming a paper insertion section, and the paper is clamped by the fixed section and the movable section if the paper is inserted into the paper insertion section. A paper conveyance direction in which the paper is directed to the paper insertion section is different from a paper discharge direction in which the paper is discharged from the discharge port. The controller controls the clamping section such that a front end of the paper is clamped with the clamping section by conveying the paper towards the paper insertion section and the paper is bent into a loop shape by further conveying the paper towards the paper insertion section from a state in which the paper is clamped by the clamping section to be discharged from the discharge port.

A printer according to an embodiment includes: a printer body including a supplying part that rotatably holds a roll-shaped sheet member; an opening and closing cover configured to open and close with respect to the printer body; a thermal head disposed on the printer body, the thermal head configured to print on the sheet member; a platen roller disposed on the opening and closing cover, the platen roller positioned at a location opposite to the thermal head and feeding the sheet member in a closed configuration; and a platen roller holding mechanism configured to attachably and detachably secure the platen roller to the opening and closing cover. The platen roller holding mechanism includes a label roll supporter that rotatably guides the roll-shaped sheet member in the supplying part. The label roll supporter includes a cross-sectional arc-shaped surface.

A mobile printer includes: a roll body accommodating portion accommodating a roll body on which recording paper is wound; a print head performing printing on the recording paper; a transport unit pulling out the recording paper from the roll body and transporting the recording paper to the print head; a cutting unit cutting the recording paper; a power supply unit supplying a drive voltage signal to the print head, the transport unit, and the cutting unit; and a housing covering the roll body accommodating portion, the print head, the transport unit, the cutting unit, and the power supply unit, in which the power supply unit has a power receiving module receiving a signal based on a power supply voltage signal from an outside by a non-contact power supply, and the power receiving module is fixed to a power supply surface of the housing by an adhesive member.

A printing apparatus includes a roll paper compartment 15 having a first placement surface 27 on which an outer peripheral surface Ra of a roll paper R around which a recording paper P is wound is placed and accommodating the roll paper R, a thermal head 67 performing printing on the recording paper P pulled out from the roll paper R accommodated in the roll paper compartment 15, a first projecting/retracting portion 77 provided to be configured to project from or retract into the first placement surface 27, pressed by the roll paper R of which the outer peripheral surface Ra is placed on the first placement surface 27 and retracting into the first placement surface 27 when a diameter of the roll paper R is larger than a predetermined diameter, and released from the pressure by the roll paper R and protruding from the first placement surface 27 when the diameter of the roll paper R is smaller than the predetermined diameter, and a detection section detecting projection and retraction of the first projecting/retracting portion 77.

A printing apparatus includes a first projecting/retracting portion located at a first pressing position when a diameter of a roll paper R is larger than a first diameter and located at a first release position when the diameter of the roll paper R is smaller than the first diameter in a case where the printing apparatus is installed in a first posture, a second projecting/retracting portion located at a second pressing position when the diameter of the roll paper R is larger than a second diameter and located at a second release position when the diameter of the roll paper R is smaller than the second diameter in a case where the printing apparatus is installed in a second posture, and a detection section having a single sensor and detecting a displacement of the first projecting/retracting portion and a displacement of the second projecting/retracting portion by the sensor.

A roll paper printer includes a container that can accommodate a roll paper around which a recording paper sheet is wound with its first surface facing outward. A transport roller pulls the recording paper sheet from the roll paper and then transports the recording paper sheet in a transport direction. A guide can be in contact with a second surface of the recording paper sheet at a location upstream of the transport roller in the transport direction. A projection can be in contact with the first surface of the recording paper sheet at another location upstream of the transport roller in the transport direction and move toward the guide. A lever can be accommodated in the projection and move in contact with the first surface of the recording paper sheet. A sensor is accommodated in the projection and detects motion of the lever.

A roll paper printer includes an accommodation section configured to accommodate roll paper wound such that one surface of recording paper faces outward, a transport roller configured to pull the recording paper from the roll paper and transport the paper in a transport direction, a guide positioned upstream of the transport roller in the transport direction and configured to come into contact with the other surface of the recording paper, and a protrusion positioned upstream of the transport roller in the transport direction and configured to come into contact with the one surface of the recording paper, the protrusion being configured to move toward the guide.

A printer includes a body configured to accommodate recording paper, a lid attached to the body to be openable and closable relative to the body, a pressing part on the lid, a platen roller attached to the lid, a movable shaft in the body, a spring that urges the movable shaft, and a lever configured to support bearings of the platen roller with the lid being closed. The movable shaft is provided at a position corresponding to the pressing part to be movable in a longitudinal direction of the movable shaft, and is pressed by the pressing part to generate a spring force in the spring during closure of the lid.

Printer is provided having support base on which print media travels. Printer includes thickness detection module and processor. Thickness detection module includes pinch arm assembly with pinch arm having first and second ends, encoder, and proximate dual channel encoder sensor. First end is biased toward support base. Encoder with number of circumferentially spaced line pairs is disposed at second end. Pinch arm and encoder configured to rotate in response to engagement of pinch arm with at least print media portion. Dual channel encoder sensor configured to detect rotation direction and encoder count and output signal representing encoder count. Encoder count is number of circumferentially spaced line pairs that pass by dual channel encoder sensor as pinch arm and encoder rotate. Processor is communicatively coupled to dual channel encoder sensor and configured to receive signal and calculate print media thickness of portion from encoder count using conversion factor.