Printing apparatus
AssigneeCanon Kabushiki Kaisha
InventorsMasato Eiyama, Yuki Igarashi, Masashi Kamada, Masashi Negishi, Ryoya Shinjo, Ryo Kobayashi, Tomohiro Suzuki, Tsutomu Obata
Life of this patent
Estimating the term…
Abstract
A roll sheet with a continuous sheet wound in a roll form is rotated in a forward direction to supply the sheet to a printing unit. A sensor whose output is changed in accordance with a distance between the sensor and the sheet is used. A rotation direction of the roll sheet is switched from an opposite direction to the forward direction on the basis of the output of the sensor during rotation of the roll sheet in the opposite direction.
Claims28
-17. (canceled)
A sheet feeding apparatus, comprising:
- a holding unit configured to rotatably hold a roll with a continuous sheet wound in a roll form;
- a driving unit configured to rotate the roll in a first direction for feeding a sheet from the roll and in a second direction opposite to the first direction;
- a lower guide configured to guide the sheet of the roll from below;
- a detection unit configured to detect a sheet end of the roll;
- a sensor unit configured to detect setting of the holding unit;
- and
- a control unit configured to cause the driving unit to start rotating the roll in the second direction based on the setting detected by the sensor unit and cause the driving unit to rotate the roll in the first direction after the sheet end of the roll rotating in the second direction is detected by the detection unit.
A printing apparatus, comprising:
- a holding unit configured to rotatably hold a roll with a continuous sheet wound in a roll form;
- a driving unit configured to rotate the roll in a first direction for feeding a sheet from the roll and in a second direction opposite to the first direction;
- a printing unit configured to print on the sheet fed by the driving unit;
- a lower guide configured to guide the sheet of the roll from below;
- a detection unit configured to detect a sheet end of the roll;
- a sensor unit configured to detect setting of the holding unit;
- and
- a control unit configured to cause the driving unit to start rotating the roll in the second direction based on the setting detected by the sensor unit and cause the driving unit to rotate the roll in the first direction after the sheet end of the roll rotating in the second direction is detected by the detection unit.
A sheet feeding method using a sheet feeding apparatus comprising a holding unit, a driving unit, a lower guide, a detection unit, a sensor unit, and a control unit, the sheet feeding method comprising:
- rotatably holding with the holding unit a roll with a continuous sheet wound in a roll form;
- rotating the roll with the driving unit in a first direction for feeding a sheet from the roll and in a second direction opposite to the first direction;
- guiding the sheet of the roll from below with the lower guide;
- detecting a sheet end of the roll with the detection unit;
- detecting setting of the holding unit with the sensor unit;
- and
- operating the control unit to cause the driving unit to start rotating the roll in the second direction based on the setting detected by the sensor unit and cause the driving unit to rotate the roll in the first direction after the sheet end of the roll rotating in the second direction is detected by the detection unit.
Dependencies are inferred from the claim text.