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US 8,616,545 B2Granted
Sheet feeding apparatus and image forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorMasatoshi Takiguchi
Life of this patent
Estimating the term…
Abstract
A link member is rotatably supported by a lifting plate. When the lifting plate moves upward and downward, the movement of the link member is guided by a guide portion provided on a link guide hole. Before sheet feeding starts, the movement of the link member is regulated by a holding portion provided on a lower end of the guide portion so as to hold the lifting plate in a standby position against a biasing force of a feed spring. When the sheet is fed, a feed cam rotating integrally with a feed roller presses the link member to release the link member from being locked by the holding portion of the link guide hole to thereby make the link member movable along the guide portion.
Claims24
A sheet feeding apparatus comprising:
- a sheet supporting portion capable of being lifted and lowered while supporting a sheet;
- a feed roller located above the sheet supporting portion and feeding the sheet stacked on the sheet supporting portion;
- and
- a lifting portion lifting and lowering the sheet supporting portion between an initial feed position and a position at which the feed roller feeds the sheet supported on the sheet supporting portion, and
- the lifting portion including:
- a biasing portion which biases the sheet supporting portion toward the feed roller;
- a link member which is rotatably supported by the sheet supporting portion;
- a holding portion which holds the link member so as to position the sheet supporting portion against a biasing force of the biasing portion at the initial feed position;
- a regulation release portion which rotates integrally with the feed roller and releases the holding of the link member held by the holding portion when the sheet is fed;
- and
- a rotation regulating portion which regulates a rotation of the link member in a predetermined range,
- wherein the rotation regulating portion includes a guide portion to regulate movement of the link member in the predetermined range and the holding portion is provided on the guide portion, and
- wherein while the regulation release portion is rotated with the feed roller which feeds the sheet supported on the sheet supporting portion, the regulation release portion engages with the link member to move the sheet supporting portion to the feed initial position and the link member is held by the holding portion.
10 more elements
A sheet feeding apparatus comprising:
- a sheet supporting portion capable of being lifted and lowered while supporting a sheet;
- a feed roller located above the sheet supporting portion and feeding the sheet stacked on the sheet supporting portion;
- and
- a lifting portion lifting and lowering the sheet supporting portion between an initial feed position and a position at which the feed roller feeds the sheet supported on the sheet supporting portion, and
- the lifting porting including:
- a biasing portion which biases the sheet supporting portion toward the feed roller;
- a link member which is rotatably supported by the sheet supporting portion;
- a cam member rotating integrally with the feed roller and which releases holding of the link member held by a holding portion when the sheet is fed;
- and
- a rotation regulating portion which regulates a rotation of the link member in a predetermined range,
- wherein the rotation regulating portion is a guide member provided on a shaft of the feed roller and having a long groove engaged with a boss provided on the link member such that the link member slides along a cam surface of the cam member when the cam member rotates.
8 more elements
A sheet feeding apparatus comprising:
- a sheet supporting portion capable of being lifted and lowered while supporting a sheet;
- a feed roller located above the sheet supporting portion and feeding the sheet stacked on the sheet supporting portion;
- and
- a lifting portion lifting and lowering the sheet supporting portion between an initial feed position and a position at which the feed roller feeds the sheet supported on the sheet supporting portion,
- the lifting portion including:
- a biasing portion which biases the sheet supporting portion toward the feed roller;
- a link member which is rotatably supported by the sheet supporting portion;
- a regulation release portion which rotates integrally with the feed roller and releases holding of the link member held by a holding portion when the sheet is fed;
- and
- a pair of guide bosses provided in an image forming apparatus body so as to be positioned on respective opposite sides of the link member to regulate rotate on of the link member.
7 more elements
A sheet feeding apparatus comprising:
- a sheet supporting portion capable of being lifted and lowered while supporting a sheet;
- a feed roller located above the sheet supporting portion and feeding the sheet stacked on the sheet supporting portion;
- and
- a lifting portion lifting and lowering the sheet supporting portion between an initial feed position and a position at which the feed roller feeds the sheet supported on the sheet supporting portion, and
- the lifting portion including:
- a biasing portion which biases the sheet supporting portion toward the feed roller;
- and
- a link member which is rotatably supported by the sheet supporting portion;
- and
- a regulation release portion which rotates integrally with the feed roller and which releases holding of the link member held by a holding portion when the sheet is fed,
- wherein the regulation release portion is a crank portion rotating integrally with the feed roller to move the link member by the rotation of the crank portion.
8 more elements
An image forming apparatus comprising:
- a sheet supporting portion capable of being lifted and lowered while supporting a sheet;
- a feed roller located above the sheet supporting portion and feeding the sheet stacked on the sheet supporting portion;
- an image forming portion which forms an image on the sheet fed by the feed roller;
- and
- a lifting portion lifting and lowering the sheet supporting portion between an initial feed position and a position at which the feed roller feeds the sheet supported on the sheet supporting portion,
- the lifting portion including:
- a biasing portion which biases the sheet supporting portion toward the feed roller;
- a link member which is rotatably supported by the sheet supporting portion;
- and
- a holding portion which holds the link member so as to position the sheet supporting portion against a biasing force of the biasing portion at the initial feed position;
- a regulation release portion which rotates integrally with the feed roller and which releases holding of the link member held by the holding portion when the sheet is fed;
- and
- a rotation regulating portion which regulates a rotation of the link member in a predetermined range,
- wherein the rotation regulating portion includes a guide portion to regulate a movement of the link member in the predetermined range and the holding portion is provided on the guide portion, and
- wherein while the regulation release portion is rotated with the feed roller which feeds the sheet supported on the sheet supporting portion, the regulation release portion engages with the link member to move the sheet supporting portion to the feed initial position and the link member is held by the holding portion.
12 more elements
An image forming apparatus comprising:
- a sheet supporting portion capable of being lifted and lowered while supporting a sheet;
- a feed roller located above the sheet supporting portion and feeding the sheet stacked on the sheet supporting portion;
- an image forming portion which forms an image on the sheet fed by the feed roller;
- and
- a lifting portion lifting and lowering the sheet supporting portion between an initial feed position and a position at which the feed roller feeds the sheet supported on the sheet supporting portion,
- the lifting portion including:
- a biasing portion which biases the sheet supporting portion toward the feed roller;
- a link member which is rotatably supported by the sheet supporting portion;
- a cam member rotating integrally with the feed roller and which releases holding of the link member held by a holding portion when the sheet is fed;
- and
- a rotation regulating portion which regulates a rotation of the link member in a predetermined range,
- wherein the rotation regulating portion is a guide member provided on a shaft of the feed roller and having a long groove engaged with a boss provided on the link member such that the link member slides along a cam surface of the cam member when the cam member rotates.
9 more elements
An image forming apparatus comprising:
- a sheet supporting portion capable of being lifted and lowered while supporting a sheet;
- a feed roller located above the sheet supporting portion and feeding the sheet stacked on the sheet supporting portion;
- an image forming portion which forms an image on the sheet fed by the feed roller;
- and
- a lifting portion lifting and lowering the sheet supporting portion between an initial feed position and a position at which the feed roller feeds the sheet supported on the sheet supporting portion,
- the lifting portion including:
- a biasing portion which biases the sheet supporting portion toward the feed roller;
- a link member which is rotatable supported by the sheet supporting portion;
- a cam member rotating integrally with the feed roller and releases holding of the link member held by a holding portion when the sheet is fed;
- and
- a pair of guide bosses provided in an image forming apparatus body so as to be positioned on respective opposite sides of the link member to regulate rotation of the link member.
8 more elements
An image forming apparatus comprising:
- a sheet supporting portion capable of being lifted and lowered while supporting a sheet;
- a feed roller located above the sheet supporting portion and feeding the sheet stacked on the sheet supporting portion;
- an image forming portion which forms an image on the sheet fed by the feed roller;
- and
- a lifting portion lifting and lowering the sheet supporting portion between an initial feed position and a position at which the feed roller feeds the sheet supported on the sheet supporting portion,
- the lifting portion including:
- a biasing portion which biases the sheet supporting portion toward the feed roller;
- a link member which is rotatably supported by the sheet supporting portion;
- and
- a regulation release portion which rotates integrally with the feed roller and which releases holding of the link member held by a holding portion when the sheet is fed,
- wherein the regulation release portion is a crank portion rotating integrally with the feed roller to move the link member by the rotation of the crank portion.
8 more elements
Dependencies are inferred from the claim text.