Printing apparatus and control method for printing apparatus
AssigneeCanon Kabushiki Kaisha
InventorYohei Omori
Life of this patent
Estimating the term…
Abstract
The printing apparatus of the present invention includes a delay mechanism that can transmit, with a delay, the rotational force of a discharge roller to a discharge tray. When the reverse rotation of the discharging roller has been begun, the delay mechanism accumulates the length of the delay, or, when the forward rotation of the discharge roller is performed for a longer period than the accumulated length of the delay, opens the discharge tray. When the feeding of a sheet is not performed during a sheet feeding operation accompanied by the reverse rotation of the discharging roller, the discharging roller is rotated forward to cancel out the length of the delay accumulated in the delay mechanism.
Claims5
A printing apparatus comprising:
- a printing unit configured to print on a sheet;
- a conveying roller that is located upstream of the printing unit in a sheet conveying direction, and which conveys the sheet;
- a conveying motor that drives the conveying roller;
- a feeding roller that is located upstream of the conveying roller in the sheet conveying direction, and which is driven by the conveying motor to feed the sheet to the conveying roller, the feeding roller feeding the sheet to the conveying roller when the conveying motor reversely rotates;
- a discharging roller that is located downstream of the printing unit in the sheet conveying direction, and which is driven by the conveying motor to discharge the sheet, the discharging roller discharging the sheet when the conveying motor forwardly rotates;
- a discharge tray that is mounted on a main body, and that is movable between an open position and a closed position, for holding sheets that are discharged outside the main body, the discharge tray moving from the closed position to the open position by transmitting the drive force from the discharging roller to the discharge tray;
- a delay mechanism for providing a delay before transmitting a rotational force of the discharging roller to the discharge tray, wherein, when the discharging roller is rotated in reverse, the delay mechanism accumulates the length of delay, and when the discharging roller is rotated forward for a period longer than the length of a delay that has been accumulated, opens the discharge tray;
- a detection unit that is located between the feeding roller and the conveying roller and which detects a leading edge of the sheet;
- and
- a control unit configured to forwardly drive the conveying motor a predetermined amount, in the case where the detection unit cannot detect the sheet, even if the feeding roller rotates a predetermined amount.
A control method, for a printing apparatus that includes a printing unit for printing on a sheet, a conveying roller that is located upstream of the printing unit in a sheet conveying direction, a conveying motor that drives the conveying roller, a feeding roller that is located upstream of the conveying roller in the sheet conveying direction and which feeds the sheet when the conveying motor rotates reversely, a discharging roller for rotating forward and discharging outside a main body of the printing apparatus a sheet that has been printed by the printing unit, a discharge tray that is pivotally mounted on the main body, between an open position and a closed position, for holding sheets that are delivered outside the main body, and a delay mechanism, for providing a delay before transmitting a rotational force of the discharging roller to the discharge tray, so that when the discharging roller is rotated in reverse, the delay mechanism accumulates the length of a delay, and when the discharging roller is rotated forward for a period longer than the length of a delay that has been accumulated, opens the discharge tray, and a detection unit, the method comprising:
- a determination step of determining with the detection unit whether feeding of a sheet is being performed during a sheet feeding operation accompanied by reverse rotation of the discharging roller;
- and
- a control step, in a case wherein it has been ascertained that the feeding of a sheet is being performed, of forwardly driving the conveying motor a predetermined amount, in the case where the detection unit cannot detect the sheet, even if the feeding roller rotates a predetermined amount.
Dependencies are inferred from the claim text.