Printing apparatus and control method therefor
AssigneeCanon Kabushiki Kaisha
InventorKanto Kurasawa
Life of this patent
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Abstract
A printing apparatus, which prints on a sheet supplied from a rolled sheet and takes up the sheet in a roll shape, includes a splice detection unit configured to detect a splice portion of the sheet, a conveyance unit configured to convey the sheet, a meandering correction unit including a sensor unit configured to detect a sheet end portion of the sheet in a width direction of the sheet on a downstream side of the splice detection unit and configured to correct meandering of the sheet based on detection of the sheet end portion by the sensor unit, and a control unit configured to control the meandering correction unit based on a relationship between a position of the splice portion and a detection area of the sensor unit.
Claims30
A printing apparatus that prints on sheets supplied from a rolled sheet and takes up the sheets in a roll shape, the apparatus comprising:
- a splice detection unit configured to detect a splice portion of the sheets, the sheets including a preceding sheet located downstream of the splice portion and a succeeding sheet located upstream of the splice portion;
- a conveyance unit configured to convey the sheets;
- a meandering correction unit including a sensor unit configured to detect a sheet end portion of the sheets in a width direction of the sheets on a downstream side of the splice detection unit and configured to correct meandering of the sheets based on detection of the sheet end portion by the sensor unit;
- a moving unit configured to move the sensor unit in a width direction of the sheets;
- and
- a control unit,
- wherein in a case in which a sheet width of the succeeding sheet is longer than a sheet width of the preceding sheet, the control unit is configured to determine a time point at which the splice portion reaches a detection area of the sensor unit based on a conveyance amount of the sheets conveyed by the conveyance unit since the splice detection unit has detected the splice portion, and to cause the moving unit to complete movement of the sensor unit by the determined time point, and
- wherein in a case in which the sheet width of the succeeding sheet is shorter than the sheet width of the preceding sheet, the control unit is configured to cause the moving unit to start movement of the sensor unit after the splice portion has passed the detection area.
A control method for a printing apparatus that prints an image on sheets by a roll-to roll scheme, and includes a splice detection unit configured to detect a splice portion of the sheets, the sheets including a preceding sheet located downstream of the splice portion and a succeeding sheet located upstream of the splice portion, a sensor unit configured to detect a sheet end portion in a width direction of the sheets on a downstream side of the splice detection unit, and a moving unit configured to move the sensor unit in a width direction of the sheet, the method comprising:
- conveying the sheets;
- controlling the moving unit;
- and
- correcting meandering of the sheets based on detection of the sheet end portion by the sensor unit,
- wherein in a case in which a sheet width of the succeeding sheet is longer than a sheet width of the preceding sheet, in the controlling, a time point at which the splice portion reaches a detection area of the sensor unit is determined based on a conveyance amount of the sheets conveyed by the conveyance unit since the splice detection unit has detected the splice portion, and the moving unit is caused to complete movement of the sensor unit by the determined time point, and
- wherein in a case in which the sheet width of the succeeding sheet is shorter than the sheet width of the preceding sheet, in the controlling, the moving unit is caused to start movement of the sensor unit after the splice portion has passed the detection area.
Dependencies are inferred from the claim text.