Abstract: A label printer including a printing section for printing a given image on a label, a label issue opening for issuing the label after the given image is printed thereon by the printing section, a sensor having a light emitting element and a light receiving element, a first prism having a reflecting surface located on one side of the label issue opening, and a second prism having a reflecting surface located on the other side of the label issue opening. The light emitted from the light emitting element is reflected on the reflecting surface of the first prism, and is then reflected on the reflecting surface of the second prism to reach the light receiving element. When the label is issued from the label issue opening, an optical axis between the reflecting surfaces of the first and second prisms intersects a surface of the label. Thus, the presence of the label projecting from the label issue opening can be surely detected.

Abstract: The invention provides a printer apparatus which comprises a pair of doors mounted for opening and closing movement on opposite sides of a body case in the form of a housing, a printer located inside each of the doors for receiving elongated continuous print paper therein in such a manner as to allow the print paper toward the door and for printing on the thus received print paper, and a pair of issuing openings located on opposite side portions of a front wall of the body case for issuing therefrom the print paper after printing by the printers. Thus, two different types of print paper can be set in position in and printed by the two printers, which reduces the necessity of frequent label exchanging operations. Besides, an operation for exchanging print paper for each of the printers can be performed readily by opening the door for the printer.