Image forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorSHIGERU KAMEYAMA
Life of this patent
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Abstract
An image forming apparatus includes a stepping motor including a coil and a rotor, a first detector for detecting a direction of the rotor, a setting unit for setting an advance angle and a second detector for detecting a rotational speed of the rotor. A controller rotates the stepping motor at a predetermined rotational speed and acquire a load torque based on an operation amount and the advance angle set by the setting unit. The setting unit updates the advance angle based on the load torque acquired by the controller, a target rotational speed of the stepping motor or a rotational speed value based on the rotational speed detected by the second detector. The controller controls a motor driver according to the direction of the rotor detected by first detector and the advance angle updated by the setting unit.
Claims13
An image forming apparatus for forming an image onto a recording material, the image forming apparatus comprising:
- a stepping motor including a coil and a rotor;
- a first detecting unit configured to detect a direction of the rotor;
- an exciting unit configured to excite the coil;
- a setting unit configured to set an advance angle which is a timing of exciting the coil to the direction of the rotor detected by the first detecting unit;
- a second detecting unit configured to detect a rotational speed of the rotor;
- and
- a control unit configured to control the stepping motor,
- wherein the control unit rotates the stepping motor at a predetermined rotational speed and acquires a load torque value based on an operation amount and the advance angle set by the setting unit,
- wherein the setting unit updates the advance angle based on the load torque value acquired by the control unit, a rotational speed value based on a target rotational speed of the stepping motor or the rotational speed detected by the second detecting unit, and
- wherein the control unit controls the exciting unit according to the direction of the rotor detected by first detecting unit and the advance angle updated by the setting unit.
Dependencies are inferred from the claim text.