US 10,293,605 B2Granted

Liquid discharging device

AssigneeBrother Kogyo Kabushiki Kaisha

InventorTsuyoshi Ito

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Abstract

A liquid discharging device, including a liquid discharging head, a carriage, a carriage movement mechanism, a sheet conveyer, and a controller, is provided. The controller conducts a printing process, in which a path-printing operation and a conveying operation are repeated alternately for a plurality of times. The controller calculates discharging timing for the liquid discharging head to discharge the liquid in a path-printing operation, for an upstream area located on an upstream side of a predetermined reference position with regard to a carriage-movable direction, by delaying the discharging timing from a predetermined reference timing; and for a downstream area located on a downstream side of the predetermined reference position, by advancing the discharging timing from the predetermined reference timing to be earlier.

Claims16

Dependent claims

A liquid discharging device, comprising:

a liquid discharging head comprising a plurality of nozzles and a liquid discharging surface, on which the plurality of nozzles are arranged;
a carriage, on which the liquid discharging head is mounted;
a carriage movement mechanism configured to reciprocally move the carriage in a carriage-movable direction along a predetermined line;
a sheet conveyer configured to convey a sheet in a conveying direction, the conveying direction intersecting with the carriage-movable direction;
and
a controller configured to control the liquid discharging head, the carriage movement mechanism, and the sheet conveyer to perform printing of an image on the sheet, the image comprising a plurality of image rows, the printing comprising a path-printing and a conveying, the path-printing and the conveying are repeated alternately for a plurality of times,
in the path-printing, the controller manipulating the carriage to move in the carriage-movable direction and the liquid discharging head to discharge the liquid through the plurality of nozzles to form each image row, and
in the conveying the controller manipulating the sheet conveyer to convey the sheet for a predetermined distance along the conveying direction after completion of the path-printing for an image row,
wherein, in the printing, the controller is configured to:
obtain discharged amount information concerning a discharged amount of the liquid discharged at the sheet in the path-printing for each image row;
determine a correction parameter to correct a discharging timing to discharge the liquid at a position on the sheet through the plurality of nozzles based on the discharged amount information for the path-printing for each image row and based on the position on the sheet in one of a first direction and a second direction with respect to a predetermined reference position, where the discharging timing is delayed by a greater length of time from a predetermined reference timing as a distance from the predetermined reference position to the position on the sheet in the first direction increases and where the discharging timing is advanced by a greater length of time from the predetermined reference timing as a distance from the predetermined reference position to the position on the sheet in the second direction increases, the first direction extending in an opposite direction as the second direction, the second direction being the direction of movement of the carriage for the image row;
and
calculate the discharging timing to discharge the liquid based on the correction parameter for the path-printing for each image row;
wherein, the plurality of image rows comprises a first image row, a second image row and a third image row, the first image row being an image row that is printed first, the second image row being an image row that is printed subsequent to the first image row, the third image row being an image row that is printed adjacent to the second image row and printed before the second image row,
wherein, when determining the correction parameter for the path-printing for the second image row, if the discharged amount of the liquid discharged at the sheet in the path-printing for the third image row is greater than a predetermined threshold amount, the controller determines a value for the correction parameter for the path-printing for the second image row based on the predetermined reference timing:
where for an area on the sheet within the second image row located at a position at a distance from the predetermined reference position in the first direction, the discharging timing is delayed by a greater length of time from the predetermined reference timing than the discharging timing for the same area, when the discharged amount of the liquid discharged at the sheet in the path-printing for the third image row is smaller than or equal to the predetermined threshold amount;
and
where for an area on the sheet within the second image row located at a position at a distance from the predetermined reference position in the second direction, the discharging timing is advanced for a greater length of time from the predetermined reference timing than the discharging timing for the same area, when the discharged amount of the liquid discharged at the sheet in the path-printing for the third image row is smaller than or equal to the predetermined threshold amount.

15 more elements

Dependencies are inferred from the claim text.

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Abstract

A liquid discharging device, comprising:

a liquid discharging head comprising a plurality of nozzles and a liquid discharging surface, on which the plurality of nozzles are arranged;
a carriage, on which the liquid discharging head is mounted;
a carriage movement mechanism configured to reciprocally move the carriage in a carriage-movable direction along a predetermined line;
a sheet conveyer configured to convey a sheet in a conveying direction, the conveying direction intersecting with the carriage-movable direction;
and
a controller configured to control the liquid discharging head, the carriage movement mechanism, and the sheet conveyer to perform printing of an image on the sheet, the image comprising a plurality of image rows, the printing comprising a path-printing and a conveying, the path-printing and the conveying are repeated alternately for a plurality of times,
in the path-printing, the controller manipulating the carriage to move in the carriage-movable direction and the liquid discharging head to discharge the liquid through the plurality of nozzles to form each image row, and
in the conveying the controller manipulating the sheet conveyer to convey the sheet for a predetermined distance along the conveying direction after completion of the path-printing for an image row,
wherein, in the printing, the controller is configured to:
obtain discharged amount information concerning a discharged amount of the liquid discharged at the sheet in the path-printing for each image row;
determine a correction parameter to correct a discharging timing to discharge the liquid at a position on the sheet through the plurality of nozzles based on the discharged amount information for the path-printing for each image row and based on the position on the sheet in one of a first direction and a second direction with respect to a predetermined reference position, where the discharging timing is delayed by a greater length of time from a predetermined reference timing as a distance from the predetermined reference position to the position on the sheet in the first direction increases and where the discharging timing is advanced by a greater length of time from the predetermined reference timing as a distance from the predetermined reference position to the position on the sheet in the second direction increases, the first direction extending in an opposite direction as the second direction, the second direction being the direction of movement of the carriage for the image row;
and
calculate the discharging timing to discharge the liquid based on the correction parameter for the path-printing for each image row;
wherein, the plurality of image rows comprises a first image row, a second image row and a third image row, the first image row being an image row that is printed first, the second image row being an image row that is printed subsequent to the first image row, the third image row being an image row that is printed adjacent to the second image row and printed before the second image row,
wherein, when determining the correction parameter for the path-printing for the second image row, if the discharged amount of the liquid discharged at the sheet in the path-printing for the third image row is greater than a predetermined threshold amount, the controller determines a value for the correction parameter for the path-printing for the second image row based on the predetermined reference timing:
where for an area on the sheet within the second image row located at a position at a distance from the predetermined reference position in the first direction, the discharging timing is delayed by a greater length of time from the predetermined reference timing than the discharging timing for the same area, when the discharged amount of the liquid discharged at the sheet in the path-printing for the third image row is smaller than or equal to the predetermined threshold amount;
and
where for an area on the sheet within the second image row located at a position at a distance from the predetermined reference position in the second direction, the discharging timing is advanced for a greater length of time from the predetermined reference timing than the discharging timing for the same area, when the discharged amount of the liquid discharged at the sheet in the path-printing for the third image row is smaller than or equal to the predetermined threshold amount.

15 more elements