Sheet transporting apparatus and image forming system
AssigneeBrother Kogyo Kabushiki Kaisha
InventorsKenji Samoto, Kenta Horade, Mitsuhiro Nozaki, Hirotaka Aoki
Life of this patent
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Abstract
A sheet transporting apparatus is provided, including a transport mechanism provided with a roller, a motor, a controller, and a measuring input unit, wherein a transport route has a curved area for inverting the sheet, and the controller is constructed such that the control on the motor is executed by a closed loop control system by using a measured value of an control output at an initial stage of the transport of a sheet from a tray, and the control on the motor is switched from the control performed by the closed loop control system to control performed by an open loop control system on condition that a preset phenomenon arises after the sheet is taken out of the tray.
Claims18
A sheet feeder comprising:
- a motor;
- a feed roller connected to the motor;
- a sheet separator positioned downstream from the feed roller and configured to separate sheets;
- an encoder positioned to detect a rotation of the motor or the feed roller, and
- a controller configured to:
- input a first current to the motor;
- based on the output from the encoder during the rotation of the motor, measure a rotational amount of the motor or the feed roller;
- based on the measured rotational amount, update the first current;
- input the updated first current to the motor;
- determine whether or not a downstream edge of a separated sheet has arrived downstream from the separator;
- and
- after determination that the downstream edge of the separated sheet has arrived downstream from the separator, switch from inputting a first current to inputting a second current not based on the measured rotational amount to the motor.
A method for controlling a sheet feeder comprising
- input a first current to a motor connected to a feed roller;
- based on the output from an encoder during the rotation of the motor, measure a rotational amount of the motor or the feed roller;
- based on the measured rotational amount, update the first current;
- input the updated first current to the motor;
- determine whether or not a downstream edge of a separated sheet has arrived downstream from the separator;
- and
- after determination that the downstream edge of the separated sheet has arrived downstream from the separator, switch from inputting a first current to inputting a second current not based on the measured rotational amount to the motor.
Dependencies are inferred from the claim text.