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.
Claims33
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 held by the holding unit 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 first contact unit supported by the lower guide and configured to contact the roll;
- a second contact unit configured to contact the roll at a contact position above the lower guide;
- a detection unit configured to detect a sheet end of the roll;
- a sensor configured to detect setting of the holding unit;
- and
- a control unit configured to, after the detection unit has detected the sheet end which has passed through the contact position while the driving unit is rotating, in the second direction, the roll which the first contact unit contacts, cause the driving unit to start rotation of the roll in the first direction for feeding the sheet based on the detection result of the sheet end.
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 held by the holding unit 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 first contact unit supported by the lower guide and configured to contact the roll;
- a second contact unit configured to contact the roll at a contact position above the lower guide;
- a detection unit configured to detect a sheet end of the roll;
- a sensor configured to detect setting of the holding unit;
- and
- a control unit configured to, after the detection unit has detected the sheet end which has passed through the contact position while the driving unit is rotating, in the second direction, the roll with the first contact unit contacting, cause the driving unit to start rotation of the roll in the first direction for feeding the sheet based on the detection result of the sheet end.
A sheet feeding method for use with a sheet feeding apparatus that includes 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 held by the holding unit 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 first contact unit supported by the lower guide and configured to contact the roll, a second contact unit configured to contact the roll at a contact position above the lower guide, a detection unit configured to detect a sheet end of the roll, and a sensor configured to detect setting of the holding unit, the method comprising:
- after the detection unit has detected the sheet end which has passed through the contact position while the driving unit is rotating, in the second direction, the roll which the first contact unit contacts, causing the driving unit to start rotation of the roll in the first direction for feeding the sheet based on the detection result of the sheet end.
Dependencies are inferred from the claim text.