Patent ID: 8947483
Filing Date: 2015-02-03
Classification: B41J

Abstract:
1. A printer, comprising: a sensor; a calculation unit that calculates an average value of mark levels and a permissible range in accordance with the average value, the mark levels being output levels of the sensor that has read a mark on a sheet a given number of times; a setting unit that, when the mark levels read the given number of times fall within the permissible range, sets a middle value between a white level and the average value as a determination value of existence or nonexistence of a next mark, the white level being an output level of the sensor when a non-marking domain of the sheet is read; and a determination unit that determines that the next mark has been detected when a mark level at the time of reading of the next mark is less than the determination value of existence or nonexistence of the next mark.