US Patent No. 10,987,955

PRINTER


Patent No. 10,987,955
Issue Date April 27, 2021
Title Printer
Inventorship Tsuyoshi Ito, Nagoya (JP)
Masao Mimoto, Nagoya (JP)
Aya Kimura, Yokohama (JP)
Assignee BROTHER KOGYO KABUSHIKI KAISHA, Nagoya (JP)

Claim of US Patent No. 10,987,955

1. A printer comprising:a first roller;
a second roller;
a motor configured to drive the first roller and the second roller to convey a sheet in a conveyance direction from the first roller toward the second roller;
a head disposed between the first roller and the second roller in the conveyance direction, the head comprising a plurality of nozzles aligned in the conveyance direction, the plurality of nozzles comprising a first nozzle and a second nozzle positioned in a downstream side from the first nozzle in the conveyance direction; and
a controller, when printing a test pattern for correcting a conveyance amount of the sheet, the test pattern comprising a first pattern and a second pattern, the controller is configured to:
control the head and the motor to print the first pattern comprising a plurality of first pattern elements on the sheet by alternately repeating:
ejecting at least one liquid droplet from the first nozzle toward the sheet to print only one of the first pattern elements on the sheet; and
conveying the sheet in the conveyance direction by a first distance,
after printing the first pattern on the sheet, control the motor to convey the sheet in the conveyance direction by a second distance where one of the first pattern elements of the first pattern faces the second nozzle during ejecting at least one liquid droplet from the second nozzle for one of a plurality of second pattern elements of the second pattern toward the sheet; and
control the head to eject respective liquid droplets from the second nozzle toward the sheet to print the plurality of second pattern elements of the second pattern on the sheet without conveying the sheet between the printing of each of the second pattern elements of the second pattern, a respective first pattern element and the one of the plurality of second pattern elements being disposed at a same location in a direction orthogonal to the conveyance direction,
wherein, during printing a test pattern comprising the first pattern, the second pattern, a third pattern and a fourth pattern, the controller is configured to:
if the sheet is positioned in a first conveyance section, control the head and the motor to print the first pattern and the second pattern on the sheet;
if the sheet is positioned in a second conveyance section, control the head to eject respective liquid droplets from the first nozzle toward the sheet to print a plurality of third pattern elements of the third pattern on the sheet without conveying the sheet between the printing of each of the third pattern elements of the third pattern;
after printing the third pattern on the sheet, control the motor to convey the sheet in the conveyance direction by a third distance where one of the third pattern elements of the third pattern faces the second nozzle;
control the head and the motor to print the fourth pattern, the fourth pattern comprising a plurality of fourth pattern elements, by alternately repeating:
ejecting at least one liquid droplet from the second nozzle toward the sheet to print one of the fourth pattern elements on the sheet; and
conveying the sheet in the conveyance direction by the first distance.