Patent ID: 9333783
Filing Date: 2016-05-10
CPC Classification: B41J,G06K

Claim Text:
1. A printer apparatus, comprising: a paper conveyance path configured to convey a paper; a carrier configured to move in a direction orthogonal to a conveyance direction of the paper to be conveyed on the paper conveyance path; a dot matrix print head configured to include head pins arranged in the carrier; an ink ribbon cassette in which an ink ribbon is arranged; a photo sensor configured to be arranged at the external side of the movement direction of the carrier in the printing area of paper and at the downstream side in the paper conveyance direction of the dot matrix print head; a concentration detection pattern printing module configured to print a predetermined concentration detection pattern with the head pins; and an exchange necessity determination section configured to determine an exchange necessity of the ink ribbon cassette according to the value that is obtained by detecting the printing created by the concentration detection pattern printing module through the photo sensor.