Patent ID: 11932013
Assignee: BROTHER KOGYO KABUSHIKI KAISHA
Field: Textile and paper machines (Mechanical engineering)
Classification: CPC B  G | IPC B  G

Claim 16:
17. A printing device comprising:
a head having a nozzle and configured to eject liquid from the nozzle toward a printing medium;
a carriage configured to move the head in a first direction, the carriage including:
a first distance sensor configured to measure a distance between the head and the printing medium, the first distance sensor being a specular reflection type distance sensor, the first distance sensor including a light-emitting element and a light-receiving element that are aligned in the first direction; and
a second distance sensor configured to measure the distance between the head and the printing medium, the second distance sensor being a diffuse reflection type distance sensor, the second distance sensor including a light-emitting element and a light-receiving element that are aligned in a second direction crossing the first direction; and

a controller configured to perform:
determining whether an output value of the second distance sensor is within an allowable range; and
in response to determining that the output value of the second distance sensor is not within the allowable range, measuring the distance using both the first distance sensor and the second distance sensor.