CROSS REFERENCE TO RELATED APPLICATION

This application claims priority from Japanese Patent Application No. 2020-064855 dated Mar. 31, 2020. The entire content of the priority application is incorporated herein by reference.

TECHNICAL FIELD

The present disclosure relates to a printing device such as a label printer.

BACKGROUND

A label printer is known in the art as one type of printing device. The label printer uses a roll of paper configured of a long strip of printing paper wound into a roll shape and prints images on labels (printing areas) arranged adjacent to each other on the printing paper along the longitudinal direction of the same.

One such label printer is provided with a print head for printing images on the printing paper, and a reading device disposed downstream of the print head for reading the images printed on the printing paper and generating image data. The label printer determines the quality of the printing results based on the image data generated by the reading device.

SUMMARY

However, it is difficult for the conventional label printer to maintain printing speed while determining the quality of printing results for all labels.

In view of the foregoing, it is an object of the present disclosure to provide a printing device that can detect poor quality printing results without a decrease in printing speed.

In order to attain the above and other objects, the disclosure provides a printer. The printer includes a conveyer, a printing portion, a reader, and a controller. The conveyer is configured to convey a sheet in a conveying direction. The printing portion is configured to print an image in a printing area of the sheet conveyed by the conveyer. The reader is located downstream of the printing portion in the conveying direction, the reader being configured to read the image in the printing area printed by the printing portion. The controller is configured to perform: in a case that the printing portion is to print images in a plurality of printing areas of the sheet, setting, as at least one target printing area, a part of the plurality of printing areas; and determining whether a printing result in each of the at least one target printing area satisfies a prescribed quality based on image data which is generated by reading the printing result by using the reader.

